text: /*
   * Scsi Host Layer for MPT (Message Passing Technology) based controllers
   *
   * This code is based on drivers/scsi/mpt2sas/mpt2_scsih.c
   * Copyright (C) 2007-2010  LSI Corporation
   *  (mailto:DL-MPTFusionLinux@lsi.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * NO WARRANTY
   * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
   * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
   * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
   * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
   * solely responsible for determining the appropriateness of using and
   * distributing the Program and assumes all risks associated with its
   * exercise of rights under this Agreement, including but not limited to
   * the risks and costs of program errors, damage to or loss of data,
   * programs or equipment, and unavailability or interruption of operations.
  
   * DISCLAIMER OF LIABILITY
   * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
   * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
   * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
  
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/errno.h>
  #include <linux/blkdev.h>
  #include <linux/sched.h>
  #include <linux/workqueue.h>
  #include <linux/delay.h>
  #include <linux/pci.h>
  #include <linux/interrupt.h>
  #include <linux/aer.h>
  #include <linux/raid_class.h>
  #include <linux/slab.h>
  
  #include "mpt2sas_base.h"
  
  MODULE_AUTHOR(MPT2SAS_AUTHOR);
  MODULE_DESCRIPTION(MPT2SAS_DESCRIPTION);
  MODULE_LICENSE("GPL");
  MODULE_VERSION(MPT2SAS_DRIVER_VERSION);
  
  #define RAID_CHANNEL 1
  
  /* forward proto's */
  static void _scsih_expander_node_remove(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_node *sas_expander);
  static void _firmware_event_work(struct work_struct *work);
  
  static u8 _scsih_check_for_pending_tm(struct MPT2SAS_ADAPTER *ioc, u16 smid);
  
  static void _scsih_scan_start(struct Scsi_Host *shost);
  static int _scsih_scan_finished(struct Scsi_Host *shost, unsigned long time);
  
  /* global parameters */
  LIST_HEAD(mpt2sas_ioc_list);
  
  /* local parameters */
  static u8 scsi_io_cb_idx = -1;
  static u8 tm_cb_idx = -1;
  static u8 ctl_cb_idx = -1;
  static u8 base_cb_idx = -1;
  static u8 port_enable_cb_idx = -1;
  static u8 transport_cb_idx = -1;
  static u8 scsih_cb_idx = -1;
  static u8 config_cb_idx = -1;
  static int mpt_ids;
  
  static u8 tm_tr_cb_idx = -1 ;
  static u8 tm_tr_volume_cb_idx = -1 ;
  static u8 tm_sas_control_cb_idx = -1;
  
  /* command line options */
  static u32 logging_level;
  MODULE_PARM_DESC(logging_level, " bits for enabling additional logging info "
      "(default=0)");
  
  static ushort max_sectors = 0xFFFF;
  module_param(max_sectors, ushort, 0);
  MODULE_PARM_DESC(max_sectors, "max sectors, range 64 to 32767  default=32767");
  
  /* scsi-mid layer global parmeter is max_report_luns, which is 511 */
  #define MPT2SAS_MAX_LUN (16895)
  static int max_lun = MPT2SAS_MAX_LUN;
  module_param(max_lun, int, 0);
  MODULE_PARM_DESC(max_lun, " max lun, default=16895 ");
  
  /* diag_buffer_enable is bitwise
   * bit 0 set = TRACE
   * bit 1 set = SNAPSHOT
   * bit 2 set = EXTENDED
   *
   * Either bit can be set, or both
   */
  static int diag_buffer_enable = -1;
  module_param(diag_buffer_enable, int, 0);
  MODULE_PARM_DESC(diag_buffer_enable, " post diag buffers "
  	"(TRACE=1/SNAPSHOT=2/EXTENDED=4/default=0)");
  
  /**
   * struct sense_info - common structure for obtaining sense keys
   * @skey: sense key
   * @asc: additional sense code
   * @ascq: additional sense code qualifier
   */
  struct sense_info {
  	u8 skey;
  	u8 asc;
  	u8 ascq;
  };
  
  
  #define MPT2SAS_TURN_ON_FAULT_LED (0xFFFC)
  #define MPT2SAS_PORT_ENABLE_COMPLETE (0xFFFD)
  #define MPT2SAS_REMOVE_UNRESPONDING_DEVICES (0xFFFF)
  /**
   * struct fw_event_work - firmware event struct
   * @list: link list framework
   * @work: work object (ioc->fault_reset_work_q)
   * @cancel_pending_work: flag set during reset handling
   * @ioc: per adapter object
   * @device_handle: device handle
   * @VF_ID: virtual function id
   * @VP_ID: virtual port id
   * @ignore: flag meaning this event has been marked to ignore
   * @event: firmware event MPI2_EVENT_XXX defined in mpt2_ioc.h
   * @event_data: reply event data payload follows
   *
   * This object stored on ioc->fw_event_list.
   */
  struct fw_event_work {
  	struct list_head 	list;
  	u8			cancel_pending_work;
  	struct delayed_work	delayed_work;
  	struct MPT2SAS_ADAPTER *ioc;
  	u16			device_handle;
  	u8			VF_ID;
  	u8			VP_ID;
  	u8			ignore;
  	u16			event;
  	void			*event_data;
  };
  
  /* raid transport support */
  static struct raid_template *mpt2sas_raid_template;
  
  /**
   * struct _scsi_io_transfer - scsi io transfer
   * @handle: sas device handle (assigned by firmware)
   * @is_raid: flag set for hidden raid components
   * @dir: DMA_TO_DEVICE, DMA_FROM_DEVICE,
   * @data_length: data transfer length
   * @data_dma: dma pointer to data
   * @sense: sense data
   * @lun: lun number
   * @cdb_length: cdb length
   * @cdb: cdb contents
   * @timeout: timeout for this command
   * @VF_ID: virtual function id
   * @VP_ID: virtual port id
   * @valid_reply: flag set for reply message
   * @sense_length: sense length
   * @ioc_status: ioc status
   * @scsi_state: scsi state
   * @scsi_status: scsi staus
   * @log_info: log information
   * @transfer_length: data length transfer when there is a reply message
   *
   * Used for sending internal scsi commands to devices within this module.
   * Refer to _scsi_send_scsi_io().
   */
  struct _scsi_io_transfer {
  	u16	handle;
  	u8	is_raid;
  	enum dma_data_direction dir;
  	u32	data_length;
  	dma_addr_t data_dma;
  	u8 	sense[SCSI_SENSE_BUFFERSIZE];
  	u32	lun;
  	u8	cdb_length;
  	u8	cdb[32];
  	u8	timeout;
  	u8	VF_ID;
  	u8	VP_ID;
  	u8	valid_reply;
    /* the following bits are only valid when 'valid_reply = 1' */
  	u32	sense_length;
  	u16	ioc_status;
  	u8	scsi_state;
  	u8	scsi_status;
  	u32	log_info;
  	u32	transfer_length;
  };
  
  /*
   * The pci device ids are defined in mpi/mpi2_cnfg.h.
   */
  static struct pci_device_id scsih_pci_table[] = {
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2004,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* Falcon ~ 2008*/
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2008,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* Liberator ~ 2108 */
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_1,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_2,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2108_3,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* Meteor ~ 2116 */
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2116_1,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2116_2,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* Thunderbolt ~ 2208 */
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_1,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_2,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_3,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_4,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_5,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2208_6,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* Mustang ~ 2308 */
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_1,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_2,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_3,
  		PCI_ANY_ID, PCI_ANY_ID },
  	/* SSS6200 */
  	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SSS6200,
  		PCI_ANY_ID, PCI_ANY_ID },
  	{0}	/* Terminating entry */
  };
  MODULE_DEVICE_TABLE(pci, scsih_pci_table);
  
  /**
   * _scsih_set_debug_level - global setting of ioc->logging_level.
   *
   * Note: The logging levels are defined in mpt2sas_debug.h.
   */
  static int
  _scsih_set_debug_level(const char *val, struct kernel_param *kp)
  {
  	int ret = param_set_int(val, kp);
  	struct MPT2SAS_ADAPTER *ioc;
  
  	if (ret)
  		return ret;
  
  	printk(KERN_INFO "setting logging_level(0x%08x)\n", logging_level);
  	list_for_each_entry(ioc, &mpt2sas_ioc_list, list)
  		ioc->logging_level = logging_level;
  	return 0;
  }
  module_param_call(logging_level, _scsih_set_debug_level, param_get_int,
      &logging_level, 0644);
  
  /**
   * _scsih_srch_boot_sas_address - search based on sas_address
   * @sas_address: sas address
   * @boot_device: boot device object from bios page 2
   *
   * Returns 1 when there's a match, 0 means no match.
   */
  static inline int
  _scsih_srch_boot_sas_address(u64 sas_address,
      Mpi2BootDeviceSasWwid_t *boot_device)
  {
  	return (sas_address == le64_to_cpu(boot_device->SASAddress)) ?  1 : 0;
  }
  
  /**
   * _scsih_srch_boot_device_name - search based on device name
   * @device_name: device name specified in INDENTIFY fram
   * @boot_device: boot device object from bios page 2
   *
   * Returns 1 when there's a match, 0 means no match.
   */
  static inline int
  _scsih_srch_boot_device_name(u64 device_name,
      Mpi2BootDeviceDeviceName_t *boot_device)
  {
  	return (device_name == le64_to_cpu(boot_device->DeviceName)) ? 1 : 0;
  }
  
  /**
   * _scsih_srch_boot_encl_slot - search based on enclosure_logical_id/slot
   * @enclosure_logical_id: enclosure logical id
   * @slot_number: slot number
   * @boot_device: boot device object from bios page 2
   *
   * Returns 1 when there's a match, 0 means no match.
   */
  static inline int
  _scsih_srch_boot_encl_slot(u64 enclosure_logical_id, u16 slot_number,
      Mpi2BootDeviceEnclosureSlot_t *boot_device)
  {
  	return (enclosure_logical_id == le64_to_cpu(boot_device->
  	    EnclosureLogicalID) && slot_number == le16_to_cpu(boot_device->
  	    SlotNumber)) ? 1 : 0;
  }
  
  /**
   * _scsih_is_boot_device - search for matching boot device.
   * @sas_address: sas address
   * @device_name: device name specified in INDENTIFY fram
   * @enclosure_logical_id: enclosure logical id
   * @slot_number: slot number
   * @form: specifies boot device form
   * @boot_device: boot device object from bios page 2
   *
   * Returns 1 when there's a match, 0 means no match.
   */
  static int
  _scsih_is_boot_device(u64 sas_address, u64 device_name,
      u64 enclosure_logical_id, u16 slot, u8 form,
      Mpi2BiosPage2BootDevice_t *boot_device)
  {
  	int rc = 0;
  
  	switch (form) {
  	case MPI2_BIOSPAGE2_FORM_SAS_WWID:
  		if (!sas_address)
  			break;
  		rc = _scsih_srch_boot_sas_address(
  		    sas_address, &boot_device->SasWwid);
  		break;
  	case MPI2_BIOSPAGE2_FORM_ENCLOSURE_SLOT:
  		if (!enclosure_logical_id)
  			break;
  		rc = _scsih_srch_boot_encl_slot(
  		    enclosure_logical_id,
  		    slot, &boot_device->EnclosureSlot);
  		break;
  	case MPI2_BIOSPAGE2_FORM_DEVICE_NAME:
  		if (!device_name)
  			break;
  		rc = _scsih_srch_boot_device_name(
  		    device_name, &boot_device->DeviceName);
  		break;
  	case MPI2_BIOSPAGE2_FORM_NO_DEVICE_SPECIFIED:
  		break;
  	}
  
  	return rc;
  }
  
  /**
   * _scsih_get_sas_address - set the sas_address for given device handle
   * @handle: device handle
   * @sas_address: sas address
   *
   * Returns 0 success, non-zero when failure
   */
  static int
  _scsih_get_sas_address(struct MPT2SAS_ADAPTER *ioc, u16 handle,
      u64 *sas_address)
  {
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u32 ioc_status;
  	*sas_address = 0;
  
  	if (handle <= ioc->sas_hba.num_phys) {
  		*sas_address = ioc->sas_hba.sas_address;
  		return 0;
  	}
  
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n", ioc->name,
  		__FILE__, __LINE__, __func__);
  		return -ENXIO;
  	}
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
  	if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
  		*sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
  		return 0;
  	}
  
  	/* we hit this becuase the given parent handle doesn't exist */
  	if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  		return -ENXIO;
  	/* else error case */
  	printk(MPT2SAS_ERR_FMT "handle(0x%04x), ioc_status(0x%04x), "
  	    "failure at %s:%d/%s()!\n", ioc->name, handle, ioc_status,
  	     __FILE__, __LINE__, __func__);
  	return -EIO;
  }
  
  /**
   * _scsih_determine_boot_device - determine boot device.
   * @ioc: per adapter object
   * @device: either sas_device or raid_device object
   * @is_raid: [flag] 1 = raid object, 0 = sas object
   *
   * Determines whether this device should be first reported device to
   * to scsi-ml or sas transport, this purpose is for persistent boot device.
   * There are primary, alternate, and current entries in bios page 2. The order
   * priority is primary, alternate, then current.  This routine saves
   * the corresponding device object and is_raid flag in the ioc object.
   * The saved data to be used later in _scsih_probe_boot_devices().
   */
  static void
  _scsih_determine_boot_device(struct MPT2SAS_ADAPTER *ioc,
      void *device, u8 is_raid)
  {
  	struct _sas_device *sas_device;
  	struct _raid_device *raid_device;
  	u64 sas_address;
  	u64 device_name;
  	u64 enclosure_logical_id;
  	u16 slot;
  
  	 /* only process this function when driver loads */
  	if (!ioc->is_driver_loading)
  		return;
  
  	 /* no Bios, return immediately */
  	if (!ioc->bios_pg3.BiosVersion)
  		return;
  
  	if (!is_raid) {
  		sas_device = device;
  		sas_address = sas_device->sas_address;
  		device_name = sas_device->device_name;
  		enclosure_logical_id = sas_device->enclosure_logical_id;
  		slot = sas_device->slot;
  	} else {
  		raid_device = device;
  		sas_address = raid_device->wwid;
  		device_name = 0;
  		enclosure_logical_id = 0;
  		slot = 0;
  	}
  
  	if (!ioc->req_boot_device.device) {
  		if (_scsih_is_boot_device(sas_address, device_name,
  		    enclosure_logical_id, slot,
  		    (ioc->bios_pg2.ReqBootDeviceForm &
  		    MPI2_BIOSPAGE2_FORM_MASK),
  		    &ioc->bios_pg2.RequestedBootDevice)) {
  			dinitprintk(ioc, printk(MPT2SAS_INFO_FMT
  			   "%s: req_boot_device(0x%016llx)\n",
  			    ioc->name, __func__,
  			    (unsigned long long)sas_address));
  			ioc->req_boot_device.device = device;
  			ioc->req_boot_device.is_raid = is_raid;
  		}
  	}
  
  	if (!ioc->req_alt_boot_device.device) {
  		if (_scsih_is_boot_device(sas_address, device_name,
  		    enclosure_logical_id, slot,
  		    (ioc->bios_pg2.ReqAltBootDeviceForm &
  		    MPI2_BIOSPAGE2_FORM_MASK),
  		    &ioc->bios_pg2.RequestedAltBootDevice)) {
  			dinitprintk(ioc, printk(MPT2SAS_INFO_FMT
  			   "%s: req_alt_boot_device(0x%016llx)\n",
  			    ioc->name, __func__,
  			    (unsigned long long)sas_address));
  			ioc->req_alt_boot_device.device = device;
  			ioc->req_alt_boot_device.is_raid = is_raid;
  		}
  	}
  
  	if (!ioc->current_boot_device.device) {
  		if (_scsih_is_boot_device(sas_address, device_name,
  		    enclosure_logical_id, slot,
  		    (ioc->bios_pg2.CurrentBootDeviceForm &
  		    MPI2_BIOSPAGE2_FORM_MASK),
  		    &ioc->bios_pg2.CurrentBootDevice)) {
  			dinitprintk(ioc, printk(MPT2SAS_INFO_FMT
  			   "%s: current_boot_device(0x%016llx)\n",
  			    ioc->name, __func__,
  			    (unsigned long long)sas_address));
  			ioc->current_boot_device.device = device;
  			ioc->current_boot_device.is_raid = is_raid;
  		}
  	}
  }
  
  /**
   * mpt2sas_scsih_sas_device_find_by_sas_address - sas device search
   * @ioc: per adapter object
   * @sas_address: sas address
   * Context: Calling function should acquire ioc->sas_device_lock
   *
   * This searches for sas_device based on sas_address, then return sas_device
   * object.
   */
  struct _sas_device *
  mpt2sas_scsih_sas_device_find_by_sas_address(struct MPT2SAS_ADAPTER *ioc,
      u64 sas_address)
  {
  	struct _sas_device *sas_device;
  
  	list_for_each_entry(sas_device, &ioc->sas_device_list, list)
  		if (sas_device->sas_address == sas_address)
  			return sas_device;
  
  	list_for_each_entry(sas_device, &ioc->sas_device_init_list, list)
  		if (sas_device->sas_address == sas_address)
  			return sas_device;
  
  	return NULL;
  }
  
  /**
   * _scsih_sas_device_find_by_handle - sas device search
   * @ioc: per adapter object
   * @handle: sas device handle (assigned by firmware)
   * Context: Calling function should acquire ioc->sas_device_lock
   *
   * This searches for sas_device based on sas_address, then return sas_device
   * object.
   */
  static struct _sas_device *
  _scsih_sas_device_find_by_handle(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _sas_device *sas_device;
  
  	list_for_each_entry(sas_device, &ioc->sas_device_list, list)
  		if (sas_device->handle == handle)
  			return sas_device;
  
  	list_for_each_entry(sas_device, &ioc->sas_device_init_list, list)
  		if (sas_device->handle == handle)
  			return sas_device;
  
  	return NULL;
  }
  
  /**
   * _scsih_sas_device_remove - remove sas_device from list.
   * @ioc: per adapter object
   * @sas_device: the sas_device object
   * Context: This function will acquire ioc->sas_device_lock.
   *
   * Removing object and freeing associated memory from the ioc->sas_device_list.
   */
  static void
  _scsih_sas_device_remove(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_device *sas_device)
  {
  	unsigned long flags;
  
  	if (!sas_device)
  		return;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	if (mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	    sas_device->sas_address)) {
  		list_del(&sas_device->list);
  		kfree(sas_device);
  	}
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  }
  
  /**
   * _scsih_sas_device_add - insert sas_device to the list.
   * @ioc: per adapter object
   * @sas_device: the sas_device object
   * Context: This function will acquire ioc->sas_device_lock.
   *
   * Adding new object to the ioc->sas_device_list.
   */
  static void
  _scsih_sas_device_add(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_device *sas_device)
  {
  	unsigned long flags;
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle"
  	    "(0x%04x), sas_addr(0x%016llx)\n", ioc->name, __func__,
  	    sas_device->handle, (unsigned long long)sas_device->sas_address));
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	list_add_tail(&sas_device->list, &ioc->sas_device_list);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
  	     sas_device->sas_address_parent)) {
  		_scsih_sas_device_remove(ioc, sas_device);
  	} else if (!sas_device->starget) {
  		/* When asyn scanning is enabled, its not possible to remove
  		 * devices while scanning is turned on due to an oops in
  		 * scsi_sysfs_add_sdev()->add_device()->sysfs_addrm_start()
  		 */
  		if (!ioc->is_driver_loading)
  			mpt2sas_transport_port_remove(ioc,
  			sas_device->sas_address,
  			sas_device->sas_address_parent);
  		_scsih_sas_device_remove(ioc, sas_device);
  	}
  }
  
  /**
   * _scsih_sas_device_init_add - insert sas_device to the list.
   * @ioc: per adapter object
   * @sas_device: the sas_device object
   * Context: This function will acquire ioc->sas_device_lock.
   *
   * Adding new object at driver load time to the ioc->sas_device_init_list.
   */
  static void
  _scsih_sas_device_init_add(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_device *sas_device)
  {
  	unsigned long flags;
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle"
  	    "(0x%04x), sas_addr(0x%016llx)\n", ioc->name, __func__,
  	    sas_device->handle, (unsigned long long)sas_device->sas_address));
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	list_add_tail(&sas_device->list, &ioc->sas_device_init_list);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	_scsih_determine_boot_device(ioc, sas_device, 0);
  }
  
  /**
   * _scsih_raid_device_find_by_id - raid device search
   * @ioc: per adapter object
   * @id: sas device target id
   * @channel: sas device channel
   * Context: Calling function should acquire ioc->raid_device_lock
   *
   * This searches for raid_device based on target id, then return raid_device
   * object.
   */
  static struct _raid_device *
  _scsih_raid_device_find_by_id(struct MPT2SAS_ADAPTER *ioc, int id, int channel)
  {
  	struct _raid_device *raid_device, *r;
  
  	r = NULL;
  	list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
  		if (raid_device->id == id && raid_device->channel == channel) {
  			r = raid_device;
  			goto out;
  		}
  	}
  
   out:
  	return r;
  }
  
  /**
   * _scsih_raid_device_find_by_handle - raid device search
   * @ioc: per adapter object
   * @handle: sas device handle (assigned by firmware)
   * Context: Calling function should acquire ioc->raid_device_lock
   *
   * This searches for raid_device based on handle, then return raid_device
   * object.
   */
  static struct _raid_device *
  _scsih_raid_device_find_by_handle(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _raid_device *raid_device, *r;
  
  	r = NULL;
  	list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
  		if (raid_device->handle != handle)
  			continue;
  		r = raid_device;
  		goto out;
  	}
  
   out:
  	return r;
  }
  
  /**
   * _scsih_raid_device_find_by_wwid - raid device search
   * @ioc: per adapter object
   * @handle: sas device handle (assigned by firmware)
   * Context: Calling function should acquire ioc->raid_device_lock
   *
   * This searches for raid_device based on wwid, then return raid_device
   * object.
   */
  static struct _raid_device *
  _scsih_raid_device_find_by_wwid(struct MPT2SAS_ADAPTER *ioc, u64 wwid)
  {
  	struct _raid_device *raid_device, *r;
  
  	r = NULL;
  	list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
  		if (raid_device->wwid != wwid)
  			continue;
  		r = raid_device;
  		goto out;
  	}
  
   out:
  	return r;
  }
  
  /**
   * _scsih_raid_device_add - add raid_device object
   * @ioc: per adapter object
   * @raid_device: raid_device object
   *
   * This is added to the raid_device_list link list.
   */
  static void
  _scsih_raid_device_add(struct MPT2SAS_ADAPTER *ioc,
      struct _raid_device *raid_device)
  {
  	unsigned long flags;
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle"
  	    "(0x%04x), wwid(0x%016llx)\n", ioc->name, __func__,
  	    raid_device->handle, (unsigned long long)raid_device->wwid));
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	list_add_tail(&raid_device->list, &ioc->raid_device_list);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  }
  
  /**
   * _scsih_raid_device_remove - delete raid_device object
   * @ioc: per adapter object
   * @raid_device: raid_device object
   *
   * This is removed from the raid_device_list link list.
   */
  static void
  _scsih_raid_device_remove(struct MPT2SAS_ADAPTER *ioc,
      struct _raid_device *raid_device)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	list_del(&raid_device->list);
  	memset(raid_device, 0, sizeof(struct _raid_device));
  	kfree(raid_device);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  }
  
  /**
   * mpt2sas_scsih_expander_find_by_handle - expander device search
   * @ioc: per adapter object
   * @handle: expander handle (assigned by firmware)
   * Context: Calling function should acquire ioc->sas_device_lock
   *
   * This searches for expander device based on handle, then returns the
   * sas_node object.
   */
  struct _sas_node *
  mpt2sas_scsih_expander_find_by_handle(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _sas_node *sas_expander, *r;
  
  	r = NULL;
  	list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
  		if (sas_expander->handle != handle)
  			continue;
  		r = sas_expander;
  		goto out;
  	}
   out:
  	return r;
  }
  
  /**
   * mpt2sas_scsih_expander_find_by_sas_address - expander device search
   * @ioc: per adapter object
   * @sas_address: sas address
   * Context: Calling function should acquire ioc->sas_node_lock.
   *
   * This searches for expander device based on sas_address, then returns the
   * sas_node object.
   */
  struct _sas_node *
  mpt2sas_scsih_expander_find_by_sas_address(struct MPT2SAS_ADAPTER *ioc,
      u64 sas_address)
  {
  	struct _sas_node *sas_expander, *r;
  
  	r = NULL;
  	list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
  		if (sas_expander->sas_address != sas_address)
  			continue;
  		r = sas_expander;
  		goto out;
  	}
   out:
  	return r;
  }
  
  /**
   * _scsih_expander_node_add - insert expander device to the list.
   * @ioc: per adapter object
   * @sas_expander: the sas_device object
   * Context: This function will acquire ioc->sas_node_lock.
   *
   * Adding new object to the ioc->sas_expander_list.
   *
   * Return nothing.
   */
  static void
  _scsih_expander_node_add(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_node *sas_expander)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->sas_node_lock, flags);
  	list_add_tail(&sas_expander->list, &ioc->sas_expander_list);
  	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  }
  
  /**
   * _scsih_is_end_device - determines if device is an end device
   * @device_info: bitfield providing information about the device.
   * Context: none
   *
   * Returns 1 if end device.
   */
  static int
  _scsih_is_end_device(u32 device_info)
  {
  	if (device_info & MPI2_SAS_DEVICE_INFO_END_DEVICE &&
  		((device_info & MPI2_SAS_DEVICE_INFO_SSP_TARGET) |
  		(device_info & MPI2_SAS_DEVICE_INFO_STP_TARGET) |
  		(device_info & MPI2_SAS_DEVICE_INFO_SATA_DEVICE)))
  		return 1;
  	else
  		return 0;
  }
  
  /**
   * _scsih_scsi_lookup_get - returns scmd entry
   * @ioc: per adapter object
   * @smid: system request message index
   *
   * Returns the smid stored scmd pointer.
   */
  static struct scsi_cmnd *
  _scsih_scsi_lookup_get(struct MPT2SAS_ADAPTER *ioc, u16 smid)
  {
  	return ioc->scsi_lookup[smid - 1].scmd;
  }
  
  /**
   * _scsih_scsi_lookup_get_clear - returns scmd entry
   * @ioc: per adapter object
   * @smid: system request message index
   *
   * Returns the smid stored scmd pointer.
   * Then will derefrence the stored scmd pointer.
   */
  static inline struct scsi_cmnd *
  _scsih_scsi_lookup_get_clear(struct MPT2SAS_ADAPTER *ioc, u16 smid)
  {
  	unsigned long flags;
  	struct scsi_cmnd *scmd;
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	scmd = ioc->scsi_lookup[smid - 1].scmd;
  	ioc->scsi_lookup[smid - 1].scmd = NULL;
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  
  	return scmd;
  }
  
  /**
   * _scsih_scsi_lookup_find_by_scmd - scmd lookup
   * @ioc: per adapter object
   * @smid: system request message index
   * @scmd: pointer to scsi command object
   * Context: This function will acquire ioc->scsi_lookup_lock.
   *
   * This will search for a scmd pointer in the scsi_lookup array,
   * returning the revelent smid.  A returned value of zero means invalid.
   */
  static u16
  _scsih_scsi_lookup_find_by_scmd(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd
      *scmd)
  {
  	u16 smid;
  	unsigned long	flags;
  	int i;
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	smid = 0;
  	for (i = 0; i < ioc->scsiio_depth; i++) {
  		if (ioc->scsi_lookup[i].scmd == scmd) {
  			smid = ioc->scsi_lookup[i].smid;
  			goto out;
  		}
  	}
   out:
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  	return smid;
  }
  
  /**
   * _scsih_scsi_lookup_find_by_target - search for matching channel:id
   * @ioc: per adapter object
   * @id: target id
   * @channel: channel
   * Context: This function will acquire ioc->scsi_lookup_lock.
   *
   * This will search for a matching channel:id in the scsi_lookup array,
   * returning 1 if found.
   */
  static u8
  _scsih_scsi_lookup_find_by_target(struct MPT2SAS_ADAPTER *ioc, int id,
      int channel)
  {
  	u8 found;
  	unsigned long	flags;
  	int i;
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	found = 0;
  	for (i = 0 ; i < ioc->scsiio_depth; i++) {
  		if (ioc->scsi_lookup[i].scmd &&
  		    (ioc->scsi_lookup[i].scmd->device->id == id &&
  		    ioc->scsi_lookup[i].scmd->device->channel == channel)) {
  			found = 1;
  			goto out;
  		}
  	}
   out:
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  	return found;
  }
  
  /**
   * _scsih_scsi_lookup_find_by_lun - search for matching channel:id:lun
   * @ioc: per adapter object
   * @id: target id
   * @lun: lun number
   * @channel: channel
   * Context: This function will acquire ioc->scsi_lookup_lock.
   *
   * This will search for a matching channel:id:lun in the scsi_lookup array,
   * returning 1 if found.
   */
  static u8
  _scsih_scsi_lookup_find_by_lun(struct MPT2SAS_ADAPTER *ioc, int id,
      unsigned int lun, int channel)
  {
  	u8 found;
  	unsigned long	flags;
  	int i;
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	found = 0;
  	for (i = 0 ; i < ioc->scsiio_depth; i++) {
  		if (ioc->scsi_lookup[i].scmd &&
  		    (ioc->scsi_lookup[i].scmd->device->id == id &&
  		    ioc->scsi_lookup[i].scmd->device->channel == channel &&
  		    ioc->scsi_lookup[i].scmd->device->lun == lun)) {
  			found = 1;
  			goto out;
  		}
  	}
   out:
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  	return found;
  }
  
  /**
   * _scsih_get_chain_buffer_tracker - obtain chain tracker
   * @ioc: per adapter object
   * @smid: smid associated to an IO request
   *
   * Returns chain tracker(from ioc->free_chain_list)
   */
  static struct chain_tracker *
  _scsih_get_chain_buffer_tracker(struct MPT2SAS_ADAPTER *ioc, u16 smid)
  {
  	struct chain_tracker *chain_req;
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	if (list_empty(&ioc->free_chain_list)) {
  		spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  		dfailprintk(ioc, printk(MPT2SAS_WARN_FMT "chain buffers not "
  			"available\n", ioc->name));
  		return NULL;
  	}
  	chain_req = list_entry(ioc->free_chain_list.next,
  	    struct chain_tracker, tracker_list);
  	list_del_init(&chain_req->tracker_list);
  	list_add_tail(&chain_req->tracker_list,
  	    &ioc->scsi_lookup[smid - 1].chain_list);
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  	return chain_req;
  }
  
  /**
   * _scsih_build_scatter_gather - main sg creation routine
   * @ioc: per adapter object
   * @scmd: scsi command
   * @smid: system request message index
   * Context: none.
   *
   * The main routine that builds scatter gather table from a given
   * scsi request sent via the .queuecommand main handler.
   *
   * Returns 0 success, anything else error
   */
  static int
  _scsih_build_scatter_gather(struct MPT2SAS_ADAPTER *ioc,
      struct scsi_cmnd *scmd, u16 smid)
  {
  	Mpi2SCSIIORequest_t *mpi_request;
  	dma_addr_t chain_dma;
  	struct scatterlist *sg_scmd;
  	void *sg_local, *chain;
  	u32 chain_offset;
  	u32 chain_length;
  	u32 chain_flags;
  	int sges_left;
  	u32 sges_in_segment;
  	u32 sgl_flags;
  	u32 sgl_flags_last_element;
  	u32 sgl_flags_end_buffer;
  	struct chain_tracker *chain_req;
  
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  
  	/* init scatter gather flags */
  	sgl_flags = MPI2_SGE_FLAGS_SIMPLE_ELEMENT;
  	if (scmd->sc_data_direction == DMA_TO_DEVICE)
  		sgl_flags |= MPI2_SGE_FLAGS_HOST_TO_IOC;
  	sgl_flags_last_element = (sgl_flags | MPI2_SGE_FLAGS_LAST_ELEMENT)
  	    << MPI2_SGE_FLAGS_SHIFT;
  	sgl_flags_end_buffer = (sgl_flags | MPI2_SGE_FLAGS_LAST_ELEMENT |
  	    MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_END_OF_LIST)
  	    << MPI2_SGE_FLAGS_SHIFT;
  	sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
  
  	sg_scmd = scsi_sglist(scmd);
  	sges_left = scsi_dma_map(scmd);
  	if (sges_left < 0) {
  		sdev_printk(KERN_ERR, scmd->device, "pci_map_sg"
  		" failed: request for %d bytes!\n", scsi_bufflen(scmd));
  		return -ENOMEM;
  	}
  
  	sg_local = &mpi_request->SGL;
  	sges_in_segment = ioc->max_sges_in_main_message;
  	if (sges_left <= sges_in_segment)
  		goto fill_in_last_segment;
  
  	mpi_request->ChainOffset = (offsetof(Mpi2SCSIIORequest_t, SGL) +
  	    (sges_in_segment * ioc->sge_size))/4;
  
  	/* fill in main message segment when there is a chain following */
  	while (sges_in_segment) {
  		if (sges_in_segment == 1)
  			ioc->base_add_sg_single(sg_local,
  			    sgl_flags_last_element | sg_dma_len(sg_scmd),
  			    sg_dma_address(sg_scmd));
  		else
  			ioc->base_add_sg_single(sg_local, sgl_flags |
  			    sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
  		sg_scmd = sg_next(sg_scmd);
  		sg_local += ioc->sge_size;
  		sges_left--;
  		sges_in_segment--;
  	}
  
  	/* initializing the chain flags and pointers */
  	chain_flags = MPI2_SGE_FLAGS_CHAIN_ELEMENT << MPI2_SGE_FLAGS_SHIFT;
  	chain_req = _scsih_get_chain_buffer_tracker(ioc, smid);
  	if (!chain_req)
  		return -1;
  	chain = chain_req->chain_buffer;
  	chain_dma = chain_req->chain_buffer_dma;
  	do {
  		sges_in_segment = (sges_left <=
  		    ioc->max_sges_in_chain_message) ? sges_left :
  		    ioc->max_sges_in_chain_message;
  		chain_offset = (sges_left == sges_in_segment) ?
  		    0 : (sges_in_segment * ioc->sge_size)/4;
  		chain_length = sges_in_segment * ioc->sge_size;
  		if (chain_offset) {
  			chain_offset = chain_offset <<
  			    MPI2_SGE_CHAIN_OFFSET_SHIFT;
  			chain_length += ioc->sge_size;
  		}
  		ioc->base_add_sg_single(sg_local, chain_flags | chain_offset |
  		    chain_length, chain_dma);
  		sg_local = chain;
  		if (!chain_offset)
  			goto fill_in_last_segment;
  
  		/* fill in chain segments */
  		while (sges_in_segment) {
  			if (sges_in_segment == 1)
  				ioc->base_add_sg_single(sg_local,
  				    sgl_flags_last_element |
  				    sg_dma_len(sg_scmd),
  				    sg_dma_address(sg_scmd));
  			else
  				ioc->base_add_sg_single(sg_local, sgl_flags |
  				    sg_dma_len(sg_scmd),
  				    sg_dma_address(sg_scmd));
  			sg_scmd = sg_next(sg_scmd);
  			sg_local += ioc->sge_size;
  			sges_left--;
  			sges_in_segment--;
  		}
  
  		chain_req = _scsih_get_chain_buffer_tracker(ioc, smid);
  		if (!chain_req)
  			return -1;
  		chain = chain_req->chain_buffer;
  		chain_dma = chain_req->chain_buffer_dma;
  	} while (1);
  
  
   fill_in_last_segment:
  
  	/* fill the last segment */
  	while (sges_left) {
  		if (sges_left == 1)
  			ioc->base_add_sg_single(sg_local, sgl_flags_end_buffer |
  			    sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
  		else
  			ioc->base_add_sg_single(sg_local, sgl_flags |
  			    sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
  		sg_scmd = sg_next(sg_scmd);
  		sg_local += ioc->sge_size;
  		sges_left--;
  	}
  
  	return 0;
  }
  
  /**
   * _scsih_adjust_queue_depth - setting device queue depth
   * @sdev: scsi device struct
   * @qdepth: requested queue depth
   *
   *
   * Returns nothing
   */
  static void
  _scsih_adjust_queue_depth(struct scsi_device *sdev, int qdepth)
  {
  	struct Scsi_Host *shost = sdev->host;
  	int max_depth;
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  
  	max_depth = shost->can_queue;
  
  	/* limit max device queue for SATA to 32 */
  	sas_device_priv_data = sdev->hostdata;
  	if (!sas_device_priv_data)
  		goto not_sata;
  	sas_target_priv_data = sas_device_priv_data->sas_target;
  	if (!sas_target_priv_data)
  		goto not_sata;
  	if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME))
  		goto not_sata;
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	   sas_device_priv_data->sas_target->sas_address);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (sas_device && sas_device->device_info &
  	    MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
  		max_depth = MPT2SAS_SATA_QUEUE_DEPTH;
  
   not_sata:
  
  	if (!sdev->tagged_supported)
  		max_depth = 1;
  	if (qdepth > max_depth)
  		qdepth = max_depth;
  	scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
  }
  
  /**
   * _scsih_change_queue_depth - setting device queue depth
   * @sdev: scsi device struct
   * @qdepth: requested queue depth
   * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
   * (see include/scsi/scsi_host.h for definition)
   *
   * Returns queue depth.
   */
  static int
  _scsih_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
  {
  	if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP)
  		_scsih_adjust_queue_depth(sdev, qdepth);
  	else if (reason == SCSI_QDEPTH_QFULL)
  		scsi_track_queue_full(sdev, qdepth);
  	else
  		return -EOPNOTSUPP;
  
  	if (sdev->inquiry_len > 7)
  		sdev_printk(KERN_INFO, sdev, "qdepth(%d), tagged(%d), "
  		"simple(%d), ordered(%d), scsi_level(%d), cmd_que(%d)\n",
  		sdev->queue_depth, sdev->tagged_supported, sdev->simple_tags,
  		sdev->ordered_tags, sdev->scsi_level,
  		(sdev->inquiry[7] & 2) >> 1);
  
  	return sdev->queue_depth;
  }
  
  /**
   * _scsih_change_queue_type - changing device queue tag type
   * @sdev: scsi device struct
   * @tag_type: requested tag type
   *
   * Returns queue tag type.
   */
  static int
  _scsih_change_queue_type(struct scsi_device *sdev, int tag_type)
  {
  	if (sdev->tagged_supported) {
  		scsi_set_tag_type(sdev, tag_type);
  		if (tag_type)
  			scsi_activate_tcq(sdev, sdev->queue_depth);
  		else
  			scsi_deactivate_tcq(sdev, sdev->queue_depth);
  	} else
  		tag_type = 0;
  
  	return tag_type;
  }
  
  /**
   * _scsih_target_alloc - target add routine
   * @starget: scsi target struct
   *
   * Returns 0 if ok. Any other return is assumed to be an error and
   * the device is ignored.
   */
  static int
  _scsih_target_alloc(struct scsi_target *starget)
  {
  	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct _sas_device *sas_device;
  	struct _raid_device *raid_device;
  	unsigned long flags;
  	struct sas_rphy *rphy;
  
  	sas_target_priv_data = kzalloc(sizeof(struct scsi_target), GFP_KERNEL);
  	if (!sas_target_priv_data)
  		return -ENOMEM;
  
  	starget->hostdata = sas_target_priv_data;
  	sas_target_priv_data->starget = starget;
  	sas_target_priv_data->handle = MPT2SAS_INVALID_DEVICE_HANDLE;
  
  	/* RAID volumes */
  	if (starget->channel == RAID_CHANNEL) {
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_id(ioc, starget->id,
  		    starget->channel);
  		if (raid_device) {
  			sas_target_priv_data->handle = raid_device->handle;
  			sas_target_priv_data->sas_address = raid_device->wwid;
  			sas_target_priv_data->flags |= MPT_TARGET_FLAGS_VOLUME;
  			sas_target_priv_data->raid_device = raid_device;
  			raid_device->starget = starget;
  		}
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  		return 0;
  	}
  
  	/* sas/sata devices */
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	rphy = dev_to_rphy(starget->dev.parent);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	   rphy->identify.sas_address);
  
  	if (sas_device) {
  		sas_target_priv_data->handle = sas_device->handle;
  		sas_target_priv_data->sas_address = sas_device->sas_address;
  		sas_device->starget = starget;
  		sas_device->id = starget->id;
  		sas_device->channel = starget->channel;
  		if (test_bit(sas_device->handle, ioc->pd_handles))
  			sas_target_priv_data->flags |=
  			    MPT_TARGET_FLAGS_RAID_COMPONENT;
  	}
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	return 0;
  }
  
  /**
   * _scsih_target_destroy - target destroy routine
   * @starget: scsi target struct
   *
   * Returns nothing.
   */
  static void
  _scsih_target_destroy(struct scsi_target *starget)
  {
  	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct _sas_device *sas_device;
  	struct _raid_device *raid_device;
  	unsigned long flags;
  	struct sas_rphy *rphy;
  
  	sas_target_priv_data = starget->hostdata;
  	if (!sas_target_priv_data)
  		return;
  
  	if (starget->channel == RAID_CHANNEL) {
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_id(ioc, starget->id,
  		    starget->channel);
  		if (raid_device) {
  			raid_device->starget = NULL;
  			raid_device->sdev = NULL;
  		}
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  		goto out;
  	}
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	rphy = dev_to_rphy(starget->dev.parent);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	   rphy->identify.sas_address);
  	if (sas_device && (sas_device->starget == starget) &&
  	    (sas_device->id == starget->id) &&
  	    (sas_device->channel == starget->channel))
  		sas_device->starget = NULL;
  
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
   out:
  	kfree(sas_target_priv_data);
  	starget->hostdata = NULL;
  }
  
  /**
   * _scsih_slave_alloc - device add routine
   * @sdev: scsi device struct
   *
   * Returns 0 if ok. Any other return is assumed to be an error and
   * the device is ignored.
   */
  static int
  _scsih_slave_alloc(struct scsi_device *sdev)
  {
  	struct Scsi_Host *shost;
  	struct MPT2SAS_ADAPTER *ioc;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_target *starget;
  	struct _raid_device *raid_device;
  	unsigned long flags;
  
  	sas_device_priv_data = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
  	if (!sas_device_priv_data)
  		return -ENOMEM;
  
  	sas_device_priv_data->lun = sdev->lun;
  	sas_device_priv_data->flags = MPT_DEVICE_FLAGS_INIT;
  
  	starget = scsi_target(sdev);
  	sas_target_priv_data = starget->hostdata;
  	sas_target_priv_data->num_luns++;
  	sas_device_priv_data->sas_target = sas_target_priv_data;
  	sdev->hostdata = sas_device_priv_data;
  	if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_RAID_COMPONENT))
  		sdev->no_uld_attach = 1;
  
  	shost = dev_to_shost(&starget->dev);
  	ioc = shost_priv(shost);
  	if (starget->channel == RAID_CHANNEL) {
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_id(ioc,
  		    starget->id, starget->channel);
  		if (raid_device)
  			raid_device->sdev = sdev; /* raid is single lun */
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  	}
  
  	return 0;
  }
  
  /**
   * _scsih_slave_destroy - device destroy routine
   * @sdev: scsi device struct
   *
   * Returns nothing.
   */
  static void
  _scsih_slave_destroy(struct scsi_device *sdev)
  {
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct scsi_target *starget;
  	struct Scsi_Host *shost;
  	struct MPT2SAS_ADAPTER *ioc;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  
  	if (!sdev->hostdata)
  		return;
  
  	starget = scsi_target(sdev);
  	sas_target_priv_data = starget->hostdata;
  	sas_target_priv_data->num_luns--;
  
  	shost = dev_to_shost(&starget->dev);
  	ioc = shost_priv(shost);
  
  	if (!(sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME)) {
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  		   sas_target_priv_data->sas_address);
  		if (sas_device && !sas_target_priv_data->num_luns)
  			sas_device->starget = NULL;
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	}
  
  	kfree(sdev->hostdata);
  	sdev->hostdata = NULL;
  }
  
  /**
   * _scsih_display_sata_capabilities - sata capabilities
   * @ioc: per adapter object
   * @sas_device: the sas_device object
   * @sdev: scsi device struct
   */
  static void
  _scsih_display_sata_capabilities(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_device *sas_device, struct scsi_device *sdev)
  {
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	u32 ioc_status;
  	u16 flags;
  	u32 device_info;
  
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, sas_device->handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	flags = le16_to_cpu(sas_device_pg0.Flags);
  	device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
  
  	sdev_printk(KERN_INFO, sdev,
  	    "atapi(%s), ncq(%s), asyn_notify(%s), smart(%s), fua(%s), "
  	    "sw_preserve(%s)\n",
  	    (device_info & MPI2_SAS_DEVICE_INFO_ATAPI_DEVICE) ? "y" : "n",
  	    (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_NCQ_SUPPORTED) ? "y" : "n",
  	    (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_ASYNCHRONOUS_NOTIFY) ? "y" :
  	    "n",
  	    (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_SMART_SUPPORTED) ? "y" : "n",
  	    (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_FUA_SUPPORTED) ? "y" : "n",
  	    (flags & MPI2_SAS_DEVICE0_FLAGS_SATA_SW_PRESERVE) ? "y" : "n");
  }
  
  /**
   * _scsih_is_raid - return boolean indicating device is raid volume
   * @dev the device struct object
   */
  static int
  _scsih_is_raid(struct device *dev)
  {
  	struct scsi_device *sdev = to_scsi_device(dev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(sdev->host);
  
  	if (ioc->is_warpdrive)
  		return 0;
  	return (sdev->channel == RAID_CHANNEL) ? 1 : 0;
  }
  
  /**
   * _scsih_get_resync - get raid volume resync percent complete
   * @dev the device struct object
   */
  static void
  _scsih_get_resync(struct device *dev)
  {
  	struct scsi_device *sdev = to_scsi_device(dev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(sdev->host);
  	static struct _raid_device *raid_device;
  	unsigned long flags;
  	Mpi2RaidVolPage0_t vol_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u32 volume_status_flags;
  	u8 percent_complete = 0;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	raid_device = _scsih_raid_device_find_by_id(ioc, sdev->id,
  	    sdev->channel);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  
  	if (!raid_device || ioc->is_warpdrive)
  		goto out;
  
  	if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, &vol_pg0,
  	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle,
  	     sizeof(Mpi2RaidVolPage0_t))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  
  	volume_status_flags = le32_to_cpu(vol_pg0.VolumeStatusFlags);
  	if (volume_status_flags & MPI2_RAIDVOL0_STATUS_FLAG_RESYNC_IN_PROGRESS)
  		percent_complete = raid_device->percent_complete;
   out:
  	raid_set_resync(mpt2sas_raid_template, dev, percent_complete);
  }
  
  /**
   * _scsih_get_state - get raid volume level
   * @dev the device struct object
   */
  static void
  _scsih_get_state(struct device *dev)
  {
  	struct scsi_device *sdev = to_scsi_device(dev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(sdev->host);
  	static struct _raid_device *raid_device;
  	unsigned long flags;
  	Mpi2RaidVolPage0_t vol_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u32 volstate;
  	enum raid_state state = RAID_STATE_UNKNOWN;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	raid_device = _scsih_raid_device_find_by_id(ioc, sdev->id,
  	    sdev->channel);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  
  	if (!raid_device)
  		goto out;
  
  	if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, &vol_pg0,
  	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle,
  	     sizeof(Mpi2RaidVolPage0_t))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  
  	volstate = le32_to_cpu(vol_pg0.VolumeStatusFlags);
  	if (volstate & MPI2_RAIDVOL0_STATUS_FLAG_RESYNC_IN_PROGRESS) {
  		state = RAID_STATE_RESYNCING;
  		goto out;
  	}
  
  	switch (vol_pg0.VolumeState) {
  	case MPI2_RAID_VOL_STATE_OPTIMAL:
  	case MPI2_RAID_VOL_STATE_ONLINE:
  		state = RAID_STATE_ACTIVE;
  		break;
  	case  MPI2_RAID_VOL_STATE_DEGRADED:
  		state = RAID_STATE_DEGRADED;
  		break;
  	case MPI2_RAID_VOL_STATE_FAILED:
  	case MPI2_RAID_VOL_STATE_MISSING:
  		state = RAID_STATE_OFFLINE;
  		break;
  	}
   out:
  	raid_set_state(mpt2sas_raid_template, dev, state);
  }
  
  /**
   * _scsih_set_level - set raid level
   * @sdev: scsi device struct
   * @raid_device: raid_device object
   */
  static void
  _scsih_set_level(struct scsi_device *sdev, struct _raid_device *raid_device)
  {
  	enum raid_level level = RAID_LEVEL_UNKNOWN;
  
  	switch (raid_device->volume_type) {
  	case MPI2_RAID_VOL_TYPE_RAID0:
  		level = RAID_LEVEL_0;
  		break;
  	case MPI2_RAID_VOL_TYPE_RAID10:
  		level = RAID_LEVEL_10;
  		break;
  	case MPI2_RAID_VOL_TYPE_RAID1E:
  		level = RAID_LEVEL_1E;
  		break;
  	case MPI2_RAID_VOL_TYPE_RAID1:
  		level = RAID_LEVEL_1;
  		break;
  	}
  
  	raid_set_level(mpt2sas_raid_template, &sdev->sdev_gendev, level);
  }
  
  /**
   * _scsih_get_volume_capabilities - volume capabilities
   * @ioc: per adapter object
   * @sas_device: the raid_device object
   *
   * Returns 0 for success, else 1
   */
  static int
  _scsih_get_volume_capabilities(struct MPT2SAS_ADAPTER *ioc,
      struct _raid_device *raid_device)
  {
  	Mpi2RaidVolPage0_t *vol_pg0;
  	Mpi2RaidPhysDiskPage0_t pd_pg0;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 sz;
  	u8 num_pds;
  
  	if ((mpt2sas_config_get_number_pds(ioc, raid_device->handle,
  	    &num_pds)) || !num_pds) {
  		dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
  		    __func__));
  		return 1;
  	}
  
  	raid_device->num_pds = num_pds;
  	sz = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
  	    sizeof(Mpi2RaidVol0PhysDisk_t));
  	vol_pg0 = kzalloc(sz, GFP_KERNEL);
  	if (!vol_pg0) {
  		dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
  		    __func__));
  		return 1;
  	}
  
  	if ((mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
  	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
  		dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
  		    __func__));
  		kfree(vol_pg0);
  		return 1;
  	}
  
  	raid_device->volume_type = vol_pg0->VolumeType;
  
  	/* figure out what the underlying devices are by
  	 * obtaining the device_info bits for the 1st device
  	 */
  	if (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
  	    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
  	    vol_pg0->PhysDisk[0].PhysDiskNum))) {
  		if (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
  		    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
  		    le16_to_cpu(pd_pg0.DevHandle)))) {
  			raid_device->device_info =
  			    le32_to_cpu(sas_device_pg0.DeviceInfo);
  		}
  	}
  
  	kfree(vol_pg0);
  	return 0;
  }
  /**
   * _scsih_disable_ddio - Disable direct I/O for all the volumes
   * @ioc: per adapter object
   */
  static void
  _scsih_disable_ddio(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2RaidVolPage1_t vol_pg1;
  	Mpi2ConfigReply_t mpi_reply;
  	struct _raid_device *raid_device;
  	u16 handle;
  	u16 ioc_status;
  
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  	    &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(vol_pg1.DevHandle);
  		raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
  		if (raid_device)
  			raid_device->direct_io_enabled = 0;
  	}
  	return;
  }
  
  
  /**
   * _scsih_get_num_volumes - Get number of volumes in the ioc
   * @ioc: per adapter object
   */
  static u8
  _scsih_get_num_volumes(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2RaidVolPage1_t vol_pg1;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 handle;
  	u8 vol_cnt = 0;
  	u16 ioc_status;
  
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  	    &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		vol_cnt++;
  		handle = le16_to_cpu(vol_pg1.DevHandle);
  	}
  	return vol_cnt;
  }
  
  
  /**
   * _scsih_init_warpdrive_properties - Set properties for warpdrive direct I/O.
   * @ioc: per adapter object
   * @raid_device: the raid_device object
   */
  static void
  _scsih_init_warpdrive_properties(struct MPT2SAS_ADAPTER *ioc,
  	struct _raid_device *raid_device)
  {
  	Mpi2RaidVolPage0_t *vol_pg0;
  	Mpi2RaidPhysDiskPage0_t pd_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 sz;
  	u8 num_pds, count;
  	unsigned long stripe_sz, block_sz;
  	u8 stripe_exp, block_exp;
  	u64 dev_max_lba;
  
  	if (!ioc->is_warpdrive)
  		return;
  
  	if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "globally as drives are exposed\n", ioc->name);
  		return;
  	}
  	if (_scsih_get_num_volumes(ioc) > 1) {
  		_scsih_disable_ddio(ioc);
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "globally as number of drives > 1\n", ioc->name);
  		return;
  	}
  	if ((mpt2sas_config_get_number_pds(ioc, raid_device->handle,
  	    &num_pds)) || !num_pds) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "Failure in computing number of drives\n", ioc->name);
  		return;
  	}
  
  	sz = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
  	    sizeof(Mpi2RaidVol0PhysDisk_t));
  	vol_pg0 = kzalloc(sz, GFP_KERNEL);
  	if (!vol_pg0) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "Memory allocation failure for RVPG0\n", ioc->name);
  		return;
  	}
  
  	if ((mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
  	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "Failure in retrieving RVPG0\n", ioc->name);
  		kfree(vol_pg0);
  		return;
  	}
  
  	/*
  	 * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
  	 * assumed for WARPDRIVE, disable direct I/O
  	 */
  	if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
  		printk(MPT2SAS_WARN_FMT "WarpDrive : Direct IO is disabled "
  		    "for the drive with handle(0x%04x): num_mem=%d, "
  		    "max_mem_allowed=%d\n", ioc->name, raid_device->handle,
  		    num_pds, MPT_MAX_WARPDRIVE_PDS);
  		kfree(vol_pg0);
  		return;
  	}
  	for (count = 0; count < num_pds; count++) {
  		if (mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
  		    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
  		    vol_pg0->PhysDisk[count].PhysDiskNum) ||
  		    pd_pg0.DevHandle == MPT2SAS_INVALID_DEVICE_HANDLE) {
  			printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is "
  			    "disabled for the drive with handle(0x%04x) member"
  			    "handle retrieval failed for member number=%d\n",
  			    ioc->name, raid_device->handle,
  			    vol_pg0->PhysDisk[count].PhysDiskNum);
  			goto out_error;
  		}
  		/* Disable direct I/O if member drive lba exceeds 4 bytes */
  		dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
  		if (dev_max_lba >> 32) {
  			printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is "
  			    "disabled for the drive with handle(0x%04x) member"
  			    "handle (0x%04x) unsupported max lba 0x%016llx\n",
  			    ioc->name, raid_device->handle,
  			    le16_to_cpu(pd_pg0.DevHandle),
  			    (unsigned long long)dev_max_lba);
  			goto out_error;
  		}
  
  		raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
  	}
  
  	/*
  	 * Assumption for WD: Direct I/O is not supported if the volume is
  	 * not RAID0
  	 */
  	if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "for the drive with handle(0x%04x): type=%d, "
  		    "s_sz=%uK, blk_size=%u\n", ioc->name,
  		    raid_device->handle, raid_device->volume_type,
  		    (le32_to_cpu(vol_pg0->StripeSize) *
  		    le16_to_cpu(vol_pg0->BlockSize)) / 1024,
  		    le16_to_cpu(vol_pg0->BlockSize));
  		goto out_error;
  	}
  
  	stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
  	stripe_exp = find_first_bit(&stripe_sz, 32);
  	if (stripe_exp == 32) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		"for the drive with handle(0x%04x) invalid stripe sz %uK\n",
  		    ioc->name, raid_device->handle,
  		    (le32_to_cpu(vol_pg0->StripeSize) *
  		    le16_to_cpu(vol_pg0->BlockSize)) / 1024);
  		goto out_error;
  	}
  	raid_device->stripe_exponent = stripe_exp;
  	block_sz = le16_to_cpu(vol_pg0->BlockSize);
  	block_exp = find_first_bit(&block_sz, 16);
  	if (block_exp == 16) {
  		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
  		    "for the drive with handle(0x%04x) invalid block sz %u\n",
  		    ioc->name, raid_device->handle,
  		    le16_to_cpu(vol_pg0->BlockSize));
  		goto out_error;
  	}
  	raid_device->block_exponent = block_exp;
  	raid_device->direct_io_enabled = 1;
  
  	printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is Enabled for the drive"
  	    " with handle(0x%04x)\n", ioc->name, raid_device->handle);
  	/*
  	 * WARPDRIVE: Though the following fields are not used for direct IO,
  	 * stored for future purpose:
  	 */
  	raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
  	raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
  	raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
  
  
  	kfree(vol_pg0);
  	return;
  
  out_error:
  	raid_device->direct_io_enabled = 0;
  	for (count = 0; count < num_pds; count++)
  		raid_device->pd_handle[count] = 0;
  	kfree(vol_pg0);
  	return;
  }
  
  /**
   * _scsih_enable_tlr - setting TLR flags
   * @ioc: per adapter object
   * @sdev: scsi device struct
   *
   * Enabling Transaction Layer Retries for tape devices when
   * vpd page 0x90 is present
   *
   */
  static void
  _scsih_enable_tlr(struct MPT2SAS_ADAPTER *ioc, struct scsi_device *sdev)
  {
  	/* only for TAPE */
  	if (sdev->type != TYPE_TAPE)
  		return;
  
  	if (!(ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR))
  		return;
  
  	sas_enable_tlr(sdev);
  	sdev_printk(KERN_INFO, sdev, "TLR %s\n",
  	    sas_is_tlr_enabled(sdev) ? "Enabled" : "Disabled");
  	return;
  
  }
  
  /**
   * _scsih_slave_configure - device configure routine.
   * @sdev: scsi device struct
   *
   * Returns 0 if ok. Any other return is assumed to be an error and
   * the device is ignored.
   */
  static int
  _scsih_slave_configure(struct scsi_device *sdev)
  {
  	struct Scsi_Host *shost = sdev->host;
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct _sas_device *sas_device;
  	struct _raid_device *raid_device;
  	unsigned long flags;
  	int qdepth;
  	u8 ssp_target = 0;
  	char *ds = "";
  	char *r_level = "";
  
  	qdepth = 1;
  	sas_device_priv_data = sdev->hostdata;
  	sas_device_priv_data->configured_lun = 1;
  	sas_device_priv_data->flags &= ~MPT_DEVICE_FLAGS_INIT;
  	sas_target_priv_data = sas_device_priv_data->sas_target;
  
  	/* raid volume handling */
  	if (sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME) {
  
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_handle(ioc,
  		     sas_target_priv_data->handle);
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  		if (!raid_device) {
  			dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  			    "failure at %s:%d/%s()!\n", ioc->name, __FILE__,
  			    __LINE__, __func__));
  			return 1;
  		}
  
  		_scsih_get_volume_capabilities(ioc, raid_device);
  
  		if (_scsih_get_volume_capabilities(ioc, raid_device)) {
  			dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  			    "failure at %s:%d/%s()!\n", ioc->name, __FILE__,
  			    __LINE__, __func__));
  			return 1;
  		}
  		/*
  		 * WARPDRIVE: Initialize the required data for Direct IO
  		 */
  		_scsih_init_warpdrive_properties(ioc, raid_device);
  
  		/* RAID Queue Depth Support
  		 * IS volume = underlying qdepth of drive type, either
  		 *    MPT2SAS_SAS_QUEUE_DEPTH or MPT2SAS_SATA_QUEUE_DEPTH
  		 * IM/IME/R10 = 128 (MPT2SAS_RAID_QUEUE_DEPTH)
  		 */
  		if (raid_device->device_info &
  		    MPI2_SAS_DEVICE_INFO_SSP_TARGET) {
  			qdepth = MPT2SAS_SAS_QUEUE_DEPTH;
  			ds = "SSP";
  		} else {
  			qdepth = MPT2SAS_SATA_QUEUE_DEPTH;
  			 if (raid_device->device_info &
  			    MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
  				ds = "SATA";
  			else
  				ds = "STP";
  		}
  
  		switch (raid_device->volume_type) {
  		case MPI2_RAID_VOL_TYPE_RAID0:
  			r_level = "RAID0";
  			break;
  		case MPI2_RAID_VOL_TYPE_RAID1E:
  			qdepth = MPT2SAS_RAID_QUEUE_DEPTH;
  			if (ioc->manu_pg10.OEMIdentifier &&
  			    (le32_to_cpu(ioc->manu_pg10.GenericFlags0) &
  			    MFG10_GF0_R10_DISPLAY) &&
  			    !(raid_device->num_pds % 2))
  				r_level = "RAID10";
  			else
  				r_level = "RAID1E";
  			break;
  		case MPI2_RAID_VOL_TYPE_RAID1:
  			qdepth = MPT2SAS_RAID_QUEUE_DEPTH;
  			r_level = "RAID1";
  			break;
  		case MPI2_RAID_VOL_TYPE_RAID10:
  			qdepth = MPT2SAS_RAID_QUEUE_DEPTH;
  			r_level = "RAID10";
  			break;
  		case MPI2_RAID_VOL_TYPE_UNKNOWN:
  		default:
  			qdepth = MPT2SAS_RAID_QUEUE_DEPTH;
  			r_level = "RAIDX";
  			break;
  		}
  
  		if (!ioc->hide_ir_msg)
  			sdev_printk(KERN_INFO, sdev, "%s: handle(0x%04x), "
  			    "wwid(0x%016llx), pd_count(%d), type(%s)\n",
  			    r_level, raid_device->handle,
  			    (unsigned long long)raid_device->wwid,
  			    raid_device->num_pds, ds);
  		_scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
  		/* raid transport support */
  		if (!ioc->is_warpdrive)
  			_scsih_set_level(sdev, raid_device);
  		return 0;
  	}
  
  	/* non-raid handling */
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	   sas_device_priv_data->sas_target->sas_address);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (sas_device) {
  		if (sas_target_priv_data->flags &
  		    MPT_TARGET_FLAGS_RAID_COMPONENT) {
  			if (mpt2sas_config_get_volume_handle(ioc,
  			    sas_device->handle, &sas_device->volume_handle)) {
  				dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  				    "failure at %s:%d/%s()!\n", ioc->name,
  				    __FILE__, __LINE__, __func__));
  				return 1;
  			}
  			if (sas_device->volume_handle &&
  			    mpt2sas_config_get_volume_wwid(ioc,
  			    sas_device->volume_handle,
  			    &sas_device->volume_wwid)) {
  				dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  				    "failure at %s:%d/%s()!\n", ioc->name,
  				    __FILE__, __LINE__, __func__));
  				return 1;
  			}
  		}
  		if (sas_device->device_info & MPI2_SAS_DEVICE_INFO_SSP_TARGET) {
  			qdepth = MPT2SAS_SAS_QUEUE_DEPTH;
  			ssp_target = 1;
  			ds = "SSP";
  		} else {
  			qdepth = MPT2SAS_SATA_QUEUE_DEPTH;
  			if (sas_device->device_info &
  			    MPI2_SAS_DEVICE_INFO_STP_TARGET)
  				ds = "STP";
  			else if (sas_device->device_info &
  			    MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
  				ds = "SATA";
  		}
  
  		sdev_printk(KERN_INFO, sdev, "%s: handle(0x%04x), "
  		    "sas_addr(0x%016llx), phy(%d), device_name(0x%016llx)\n",
  		    ds, sas_device->handle,
  		    (unsigned long long)sas_device->sas_address,
  		    sas_device->phy,
  		    (unsigned long long)sas_device->device_name);
  		sdev_printk(KERN_INFO, sdev, "%s: "
  		    "enclosure_logical_id(0x%016llx), slot(%d)\n", ds,
  		    (unsigned long long) sas_device->enclosure_logical_id,
  		    sas_device->slot);
  
  		if (!ssp_target)
  			_scsih_display_sata_capabilities(ioc, sas_device, sdev);
  	} else {
  		dfailprintk(ioc, printk(MPT2SAS_WARN_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name, __FILE__, __LINE__,
  		    __func__));
  		return 1;
  	}
  
  	_scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
  
  	if (ssp_target) {
  		sas_read_port_mode_page(sdev);
  		_scsih_enable_tlr(ioc, sdev);
  	}
  	return 0;
  }
  
  /**
   * _scsih_bios_param - fetch head, sector, cylinder info for a disk
   * @sdev: scsi device struct
   * @bdev: pointer to block device context
   * @capacity: device size (in 512 byte sectors)
   * @params: three element array to place output:
   *              params[0] number of heads (max 255)
   *              params[1] number of sectors (max 63)
   *              params[2] number of cylinders
   *
   * Return nothing.
   */
  static int
  _scsih_bios_param(struct scsi_device *sdev, struct block_device *bdev,
      sector_t capacity, int params[])
  {
  	int		heads;
  	int		sectors;
  	sector_t	cylinders;
  	ulong 		dummy;
  
  	heads = 64;
  	sectors = 32;
  
  	dummy = heads * sectors;
  	cylinders = capacity;
  	sector_div(cylinders, dummy);
  
  	/*
  	 * Handle extended translation size for logical drives
  	 * > 1Gb
  	 */
  	if ((ulong)capacity >= 0x200000) {
  		heads = 255;
  		sectors = 63;
  		dummy = heads * sectors;
  		cylinders = capacity;
  		sector_div(cylinders, dummy);
  	}
  
  	/* return result */
  	params[0] = heads;
  	params[1] = sectors;
  	params[2] = cylinders;
  
  	return 0;
  }
  
  /**
   * _scsih_response_code - translation of device response code
   * @ioc: per adapter object
   * @response_code: response code returned by the device
   *
   * Return nothing.
   */
  static void
  _scsih_response_code(struct MPT2SAS_ADAPTER *ioc, u8 response_code)
  {
  	char *desc;
  
  	switch (response_code) {
  	case MPI2_SCSITASKMGMT_RSP_TM_COMPLETE:
  		desc = "task management request completed";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_INVALID_FRAME:
  		desc = "invalid frame";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_TM_NOT_SUPPORTED:
  		desc = "task management request not supported";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_TM_FAILED:
  		desc = "task management request failed";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_TM_SUCCEEDED:
  		desc = "task management request succeeded";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_TM_INVALID_LUN:
  		desc = "invalid lun";
  		break;
  	case 0xA:
  		desc = "overlapped tag attempted";
  		break;
  	case MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC:
  		desc = "task queued, however not sent to target";
  		break;
  	default:
  		desc = "unknown";
  		break;
  	}
  	printk(MPT2SAS_WARN_FMT "response_code(0x%01x): %s\n",
  		ioc->name, response_code, desc);
  }
  
  /**
   * _scsih_tm_done - tm completion routine
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   * Context: none.
   *
   * The callback handler when using scsih_issue_tm.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_tm_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
  {
  	MPI2DefaultReply_t *mpi_reply;
  
  	if (ioc->tm_cmds.status == MPT2_CMD_NOT_USED)
  		return 1;
  	if (ioc->tm_cmds.smid != smid)
  		return 1;
  	mpt2sas_base_flush_reply_queues(ioc);
  	ioc->tm_cmds.status |= MPT2_CMD_COMPLETE;
  	mpi_reply =  mpt2sas_base_get_reply_virt_addr(ioc, reply);
  	if (mpi_reply) {
  		memcpy(ioc->tm_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
  		ioc->tm_cmds.status |= MPT2_CMD_REPLY_VALID;
  	}
  	ioc->tm_cmds.status &= ~MPT2_CMD_PENDING;
  	complete(&ioc->tm_cmds.done);
  	return 1;
  }
  
  /**
   * mpt2sas_scsih_set_tm_flag - set per target tm_busy
   * @ioc: per adapter object
   * @handle: device handle
   *
   * During taskmangement request, we need to freeze the device queue.
   */
  void
  mpt2sas_scsih_set_tm_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  	u8 skip = 0;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		if (skip)
  			continue;
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (sas_device_priv_data->sas_target->handle == handle) {
  			sas_device_priv_data->sas_target->tm_busy = 1;
  			skip = 1;
  			ioc->ignore_loginfos = 1;
  		}
  	}
  }
  
  /**
   * mpt2sas_scsih_clear_tm_flag - clear per target tm_busy
   * @ioc: per adapter object
   * @handle: device handle
   *
   * During taskmangement request, we need to freeze the device queue.
   */
  void
  mpt2sas_scsih_clear_tm_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  	u8 skip = 0;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		if (skip)
  			continue;
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (sas_device_priv_data->sas_target->handle == handle) {
  			sas_device_priv_data->sas_target->tm_busy = 0;
  			skip = 1;
  			ioc->ignore_loginfos = 0;
  		}
  	}
  }
  
  
  /**
   * mpt2sas_scsih_issue_tm - main routine for sending tm requests
   * @ioc: per adapter struct
   * @device_handle: device handle
   * @channel: the channel assigned by the OS
   * @id: the id assigned by the OS
   * @lun: lun number
   * @type: MPI2_SCSITASKMGMT_TASKTYPE__XXX (defined in mpi2_init.h)
   * @smid_task: smid assigned to the task
   * @timeout: timeout in seconds
   * @serial_number: the serial_number from scmd
   * @m_type: TM_MUTEX_ON or TM_MUTEX_OFF
   * Context: user
   *
   * A generic API for sending task management requests to firmware.
   *
   * The callback index is set inside `ioc->tm_cb_idx`.
   *
   * Return SUCCESS or FAILED.
   */
  int
  mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint channel,
      uint id, uint lun, u8 type, u16 smid_task, ulong timeout,
  	unsigned long serial_number, enum mutex_type m_type)
  {
  	Mpi2SCSITaskManagementRequest_t *mpi_request;
  	Mpi2SCSITaskManagementReply_t *mpi_reply;
  	u16 smid = 0;
  	u32 ioc_state;
  	unsigned long timeleft;
  	struct scsiio_tracker *scsi_lookup = NULL;
  	int rc;
  
  	if (m_type == TM_MUTEX_ON)
  		mutex_lock(&ioc->tm_cmds.mutex);
  	if (ioc->tm_cmds.status != MPT2_CMD_NOT_USED) {
  		printk(MPT2SAS_INFO_FMT "%s: tm_cmd busy!!!\n",
  		    __func__, ioc->name);
  		rc = FAILED;
  		goto err_out;
  	}
  
  	if (ioc->shost_recovery || ioc->remove_host ||
  	    ioc->pci_error_recovery) {
  		printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
  		    __func__, ioc->name);
  		rc = FAILED;
  		goto err_out;
  	}
  
  	ioc_state = mpt2sas_base_get_iocstate(ioc, 0);
  	if (ioc_state & MPI2_DOORBELL_USED) {
  		dhsprintk(ioc, printk(MPT2SAS_INFO_FMT "unexpected doorbell "
  		    "active!\n", ioc->name));
  		rc = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
  		    FORCE_BIG_HAMMER);
  		rc = (!rc) ? SUCCESS : FAILED;
  		goto err_out;
  	}
  
  	if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
  		mpt2sas_base_fault_info(ioc, ioc_state &
  		    MPI2_DOORBELL_DATA_MASK);
  		rc = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
  		    FORCE_BIG_HAMMER);
  		rc = (!rc) ? SUCCESS : FAILED;
  		goto err_out;
  	}
  
  	smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_cb_idx);
  	if (!smid) {
  		printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
  		    ioc->name, __func__);
  		rc = FAILED;
  		goto err_out;
  	}
  
  	if (type == MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK)
  		scsi_lookup = &ioc->scsi_lookup[smid_task - 1];
  
  	dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "sending tm: handle(0x%04x),"
  	    " task_type(0x%02x), smid(%d)\n", ioc->name, handle, type,
  	    smid_task));
  	ioc->tm_cmds.status = MPT2_CMD_PENDING;
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  	ioc->tm_cmds.smid = smid;
  	memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
  	memset(ioc->tm_cmds.reply, 0, sizeof(Mpi2SCSITaskManagementReply_t));
  	mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
  	mpi_request->DevHandle = cpu_to_le16(handle);
  	mpi_request->TaskType = type;
  	mpi_request->TaskMID = cpu_to_le16(smid_task);
  	int_to_scsilun(lun, (struct scsi_lun *)mpi_request->LUN);
  	mpt2sas_scsih_set_tm_flag(ioc, handle);
  	init_completion(&ioc->tm_cmds.done);
  	mpt2sas_base_put_smid_hi_priority(ioc, smid);
  	timeleft = wait_for_completion_timeout(&ioc->tm_cmds.done, timeout*HZ);
  	if (!(ioc->tm_cmds.status & MPT2_CMD_COMPLETE)) {
  		printk(MPT2SAS_ERR_FMT "%s: timeout\n",
  		    ioc->name, __func__);
  		_debug_dump_mf(mpi_request,
  		    sizeof(Mpi2SCSITaskManagementRequest_t)/4);
  		if (!(ioc->tm_cmds.status & MPT2_CMD_RESET)) {
  			rc = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
  			    FORCE_BIG_HAMMER);
  			rc = (!rc) ? SUCCESS : FAILED;
  			ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
  			mpt2sas_scsih_clear_tm_flag(ioc, handle);
  			goto err_out;
  		}
  	}
  
  	if (ioc->tm_cmds.status & MPT2_CMD_REPLY_VALID) {
  		mpi_reply = ioc->tm_cmds.reply;
  		dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "complete tm: "
  		    "ioc_status(0x%04x), loginfo(0x%08x), term_count(0x%08x)\n",
  		    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
  		    le32_to_cpu(mpi_reply->IOCLogInfo),
  		    le32_to_cpu(mpi_reply->TerminationCount)));
  		if (ioc->logging_level & MPT_DEBUG_TM) {
  			_scsih_response_code(ioc, mpi_reply->ResponseCode);
  			if (mpi_reply->IOCStatus)
  				_debug_dump_mf(mpi_request,
  				    sizeof(Mpi2SCSITaskManagementRequest_t)/4);
  		}
  	}
  
  	switch (type) {
  	case MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK:
  		rc = SUCCESS;
  		if (scsi_lookup->scmd == NULL)
  			break;
  		rc = FAILED;
  		break;
  
  	case MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET:
  		if (_scsih_scsi_lookup_find_by_target(ioc, id, channel))
  			rc = FAILED;
  		else
  			rc = SUCCESS;
  		break;
  
  	case MPI2_SCSITASKMGMT_TASKTYPE_ABRT_TASK_SET:
  	case MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET:
  		if (_scsih_scsi_lookup_find_by_lun(ioc, id, lun, channel))
  			rc = FAILED;
  		else
  			rc = SUCCESS;
  		break;
  	case MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK:
  		rc = SUCCESS;
  		break;
  	default:
  		rc = FAILED;
  		break;
  	}
  
  	mpt2sas_scsih_clear_tm_flag(ioc, handle);
  	ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
  	if (m_type == TM_MUTEX_ON)
  		mutex_unlock(&ioc->tm_cmds.mutex);
  
  	return rc;
  
   err_out:
  	if (m_type == TM_MUTEX_ON)
  		mutex_unlock(&ioc->tm_cmds.mutex);
  	return rc;
  }
  
  /**
   * _scsih_tm_display_info - displays info about the device
   * @ioc: per adapter struct
   * @scmd: pointer to scsi command object
   *
   * Called by task management callback handlers.
   */
  static void
  _scsih_tm_display_info(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd)
  {
  	struct scsi_target *starget = scmd->device->sdev_target;
  	struct MPT2SAS_TARGET *priv_target = starget->hostdata;
  	struct _sas_device *sas_device = NULL;
  	unsigned long flags;
  	char *device_str = NULL;
  
  	if (!priv_target)
  		return;
  	if (ioc->hide_ir_msg)
  		device_str = "WarpDrive";
  	else
  		device_str = "volume";
  
  	scsi_print_command(scmd);
  	if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
  		starget_printk(KERN_INFO, starget, "%s handle(0x%04x), "
  		    "%s wwid(0x%016llx)\n", device_str, priv_target->handle,
  		    device_str, (unsigned long long)priv_target->sas_address);
  	} else {
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  		    priv_target->sas_address);
  		if (sas_device) {
  			if (priv_target->flags &
  			    MPT_TARGET_FLAGS_RAID_COMPONENT) {
  				starget_printk(KERN_INFO, starget,
  				    "volume handle(0x%04x), "
  				    "volume wwid(0x%016llx)\n",
  				    sas_device->volume_handle,
  				   (unsigned long long)sas_device->volume_wwid);
  			}
  			starget_printk(KERN_INFO, starget,
  			    "handle(0x%04x), sas_address(0x%016llx), phy(%d)\n",
  			    sas_device->handle,
  			    (unsigned long long)sas_device->sas_address,
  			    sas_device->phy);
  			starget_printk(KERN_INFO, starget,
  			    "enclosure_logical_id(0x%016llx), slot(%d)\n",
  			   (unsigned long long)sas_device->enclosure_logical_id,
  			    sas_device->slot);
  		}
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	}
  }
  
  /**
   * _scsih_abort - eh threads main abort routine
   * @scmd: pointer to scsi command object
   *
   * Returns SUCCESS if command aborted else FAILED
   */
  static int
  _scsih_abort(struct scsi_cmnd *scmd)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	u16 smid;
  	u16 handle;
  	int r;
  
  	sdev_printk(KERN_INFO, scmd->device, "attempting task abort! "
  	    "scmd(%p)\n", scmd);
  	_scsih_tm_display_info(ioc, scmd);
  
  	sas_device_priv_data = scmd->device->hostdata;
  	if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
  		sdev_printk(KERN_INFO, scmd->device, "device been deleted! "
  		    "scmd(%p)\n", scmd);
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		r = SUCCESS;
  		goto out;
  	}
  
  	/* search for the command */
  	smid = _scsih_scsi_lookup_find_by_scmd(ioc, scmd);
  	if (!smid) {
  		scmd->result = DID_RESET << 16;
  		r = SUCCESS;
  		goto out;
  	}
  
  	/* for hidden raid components and volumes this is not supported */
  	if (sas_device_priv_data->sas_target->flags &
  	    MPT_TARGET_FLAGS_RAID_COMPONENT ||
  	    sas_device_priv_data->sas_target->flags & MPT_TARGET_FLAGS_VOLUME) {
  		scmd->result = DID_RESET << 16;
  		r = FAILED;
  		goto out;
  	}
  
  	mpt2sas_halt_firmware(ioc);
  
  	handle = sas_device_priv_data->sas_target->handle;
  	r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
  	    scmd->device->id, scmd->device->lun,
  	    MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK, smid, 30,
  	    scmd->serial_number, TM_MUTEX_ON);
  
   out:
  	sdev_printk(KERN_INFO, scmd->device, "task abort: %s scmd(%p)\n",
  	    ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
  	return r;
  }
  
  /**
   * _scsih_dev_reset - eh threads main device reset routine
   * @scmd: pointer to scsi command object
   *
   * Returns SUCCESS if command aborted else FAILED
   */
  static int
  _scsih_dev_reset(struct scsi_cmnd *scmd)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16	handle;
  	int r;
  
  	struct scsi_target *starget = scmd->device->sdev_target;
  
  	starget_printk(KERN_INFO, starget, "attempting device reset! "
  	    "scmd(%p)\n", scmd);
  	_scsih_tm_display_info(ioc, scmd);
  
  	sas_device_priv_data = scmd->device->hostdata;
  	if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
  		starget_printk(KERN_INFO, starget, "device been deleted! "
  		    "scmd(%p)\n", scmd);
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		r = SUCCESS;
  		goto out;
  	}
  
  	/* for hidden raid components obtain the volume_handle */
  	handle = 0;
  	if (sas_device_priv_data->sas_target->flags &
  	    MPT_TARGET_FLAGS_RAID_COMPONENT) {
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = _scsih_sas_device_find_by_handle(ioc,
  		   sas_device_priv_data->sas_target->handle);
  		if (sas_device)
  			handle = sas_device->volume_handle;
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	} else
  		handle = sas_device_priv_data->sas_target->handle;
  
  	if (!handle) {
  		scmd->result = DID_RESET << 16;
  		r = FAILED;
  		goto out;
  	}
  
  	r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
  	    scmd->device->id, scmd->device->lun,
  	    MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, 0, 30, 0,
  	    TM_MUTEX_ON);
  
   out:
  	sdev_printk(KERN_INFO, scmd->device, "device reset: %s scmd(%p)\n",
  	    ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
  	return r;
  }
  
  /**
   * _scsih_target_reset - eh threads main target reset routine
   * @scmd: pointer to scsi command object
   *
   * Returns SUCCESS if command aborted else FAILED
   */
  static int
  _scsih_target_reset(struct scsi_cmnd *scmd)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16	handle;
  	int r;
  	struct scsi_target *starget = scmd->device->sdev_target;
  
  	starget_printk(KERN_INFO, starget, "attempting target reset! "
  	    "scmd(%p)\n", scmd);
  	_scsih_tm_display_info(ioc, scmd);
  
  	sas_device_priv_data = scmd->device->hostdata;
  	if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
  		starget_printk(KERN_INFO, starget, "target been deleted! "
  		    "scmd(%p)\n", scmd);
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		r = SUCCESS;
  		goto out;
  	}
  
  	/* for hidden raid components obtain the volume_handle */
  	handle = 0;
  	if (sas_device_priv_data->sas_target->flags &
  	    MPT_TARGET_FLAGS_RAID_COMPONENT) {
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = _scsih_sas_device_find_by_handle(ioc,
  		   sas_device_priv_data->sas_target->handle);
  		if (sas_device)
  			handle = sas_device->volume_handle;
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	} else
  		handle = sas_device_priv_data->sas_target->handle;
  
  	if (!handle) {
  		scmd->result = DID_RESET << 16;
  		r = FAILED;
  		goto out;
  	}
  
  	r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
  	    scmd->device->id, 0, MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0,
  	    30, 0, TM_MUTEX_ON);
  
   out:
  	starget_printk(KERN_INFO, starget, "target reset: %s scmd(%p)\n",
  	    ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
  	return r;
  }
  
  /**
   * _scsih_host_reset - eh threads main host reset routine
   * @scmd: pointer to scsi command object
   *
   * Returns SUCCESS if command aborted else FAILED
   */
  static int
  _scsih_host_reset(struct scsi_cmnd *scmd)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
  	int r, retval;
  
  	printk(MPT2SAS_INFO_FMT "attempting host reset! scmd(%p)\n",
  	    ioc->name, scmd);
  	scsi_print_command(scmd);
  
  	retval = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
  	    FORCE_BIG_HAMMER);
  	r = (retval < 0) ? FAILED : SUCCESS;
  	printk(MPT2SAS_INFO_FMT "host reset: %s scmd(%p)\n",
  	    ioc->name, ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
  
  	return r;
  }
  
  /**
   * _scsih_fw_event_add - insert and queue up fw_event
   * @ioc: per adapter object
   * @fw_event: object describing the event
   * Context: This function will acquire ioc->fw_event_lock.
   *
   * This adds the firmware event object into link list, then queues it up to
   * be processed from user context.
   *
   * Return nothing.
   */
  static void
  _scsih_fw_event_add(struct MPT2SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
  {
  	unsigned long flags;
  
  	if (ioc->firmware_event_thread == NULL)
  		return;
  
  	spin_lock_irqsave(&ioc->fw_event_lock, flags);
  	list_add_tail(&fw_event->list, &ioc->fw_event_list);
  	INIT_DELAYED_WORK(&fw_event->delayed_work, _firmware_event_work);
  	queue_delayed_work(ioc->firmware_event_thread,
  	    &fw_event->delayed_work, 0);
  	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
  }
  
  /**
   * _scsih_fw_event_free - delete fw_event
   * @ioc: per adapter object
   * @fw_event: object describing the event
   * Context: This function will acquire ioc->fw_event_lock.
   *
   * This removes firmware event object from link list, frees associated memory.
   *
   * Return nothing.
   */
  static void
  _scsih_fw_event_free(struct MPT2SAS_ADAPTER *ioc, struct fw_event_work
      *fw_event)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->fw_event_lock, flags);
  	list_del(&fw_event->list);
  	kfree(fw_event->event_data);
  	kfree(fw_event);
  	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
  }
  
  
  /**
   * _scsih_error_recovery_delete_devices - remove devices not responding
   * @ioc: per adapter object
   *
   * Return nothing.
   */
  static void
  _scsih_error_recovery_delete_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct fw_event_work *fw_event;
  
  	if (ioc->is_driver_loading)
  		return;
  
  	fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
  	if (!fw_event)
  		return;
  
  	fw_event->event = MPT2SAS_REMOVE_UNRESPONDING_DEVICES;
  	fw_event->ioc = ioc;
  	_scsih_fw_event_add(ioc, fw_event);
  }
  
  /**
   * mpt2sas_port_enable_complete - port enable completed (fake event)
   * @ioc: per adapter object
   *
   * Return nothing.
   */
  void
  mpt2sas_port_enable_complete(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct fw_event_work *fw_event;
  
  	fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
  	if (!fw_event)
  		return;
  	fw_event->event = MPT2SAS_PORT_ENABLE_COMPLETE;
  	fw_event->ioc = ioc;
  	_scsih_fw_event_add(ioc, fw_event);
  }
  
  /**
   * _scsih_fw_event_cleanup_queue - cleanup event queue
   * @ioc: per adapter object
   *
   * Walk the firmware event queue, either killing timers, or waiting
   * for outstanding events to complete
   *
   * Return nothing.
   */
  static void
  _scsih_fw_event_cleanup_queue(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct fw_event_work *fw_event, *next;
  
  	if (list_empty(&ioc->fw_event_list) ||
  	     !ioc->firmware_event_thread || in_interrupt())
  		return;
  
  	list_for_each_entry_safe(fw_event, next, &ioc->fw_event_list, list) {
  		if (cancel_delayed_work(&fw_event->delayed_work)) {
  			_scsih_fw_event_free(ioc, fw_event);
  			continue;
  		}
  		fw_event->cancel_pending_work = 1;
  	}
  }
  
  /**
   * _scsih_ublock_io_all_device - unblock every device
   * @ioc: per adapter object
   *
   * change the device state from block to running
   */
  static void
  _scsih_ublock_io_all_device(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (!sas_device_priv_data->block)
  			continue;
  		sas_device_priv_data->block = 0;
  		dewtprintk(ioc, sdev_printk(KERN_INFO, sdev, "device_running, "
  		    "handle(0x%04x)\n",
  		    sas_device_priv_data->sas_target->handle));
  		scsi_internal_device_unblock(sdev);
  	}
  }
  /**
   * _scsih_ublock_io_device - set the device state to SDEV_RUNNING
   * @ioc: per adapter object
   * @handle: device handle
   *
   * During device pull we need to appropiately set the sdev state.
   */
  static void
  _scsih_ublock_io_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (!sas_device_priv_data->block)
  			continue;
  		if (sas_device_priv_data->sas_target->handle == handle) {
  			dewtprintk(ioc, sdev_printk(KERN_INFO, sdev,
  			    MPT2SAS_INFO_FMT "SDEV_RUNNING: "
  			    "handle(0x%04x)\n", ioc->name, handle));
  			sas_device_priv_data->block = 0;
  			scsi_internal_device_unblock(sdev);
  		}
  	}
  }
  
  /**
   * _scsih_block_io_all_device - set the device state to SDEV_BLOCK
   * @ioc: per adapter object
   * @handle: device handle
   *
   * During device pull we need to appropiately set the sdev state.
   */
  static void
  _scsih_block_io_all_device(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (sas_device_priv_data->block)
  			continue;
  		sas_device_priv_data->block = 1;
  		dewtprintk(ioc, sdev_printk(KERN_INFO, sdev, "device_blocked, "
  		    "handle(0x%04x)\n",
  		    sas_device_priv_data->sas_target->handle));
  		scsi_internal_device_block(sdev);
  	}
  }
  
  
  /**
   * _scsih_block_io_device - set the device state to SDEV_BLOCK
   * @ioc: per adapter object
   * @handle: device handle
   *
   * During device pull we need to appropiately set the sdev state.
   */
  static void
  _scsih_block_io_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data)
  			continue;
  		if (sas_device_priv_data->block)
  			continue;
  		if (sas_device_priv_data->sas_target->handle == handle) {
  			dewtprintk(ioc, sdev_printk(KERN_INFO, sdev,
  			    MPT2SAS_INFO_FMT "SDEV_BLOCK: "
  			    "handle(0x%04x)\n", ioc->name, handle));
  			sas_device_priv_data->block = 1;
  			scsi_internal_device_block(sdev);
  		}
  	}
  }
  
  /**
   * _scsih_block_io_to_children_attached_to_ex
   * @ioc: per adapter object
   * @sas_expander: the sas_device object
   *
   * This routine set sdev state to SDEV_BLOCK for all devices
   * attached to this expander. This function called when expander is
   * pulled.
   */
  static void
  _scsih_block_io_to_children_attached_to_ex(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_node *sas_expander)
  {
  	struct _sas_port *mpt2sas_port;
  	struct _sas_device *sas_device;
  	struct _sas_node *expander_sibling;
  	unsigned long flags;
  
  	if (!sas_expander)
  		return;
  
  	list_for_each_entry(mpt2sas_port,
  	   &sas_expander->sas_port_list, port_list) {
  		if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_END_DEVICE) {
  			spin_lock_irqsave(&ioc->sas_device_lock, flags);
  			sas_device =
  			    mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  			   mpt2sas_port->remote_identify.sas_address);
  			spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  			if (!sas_device)
  				continue;
  			_scsih_block_io_device(ioc, sas_device->handle);
  		}
  	}
  
  	list_for_each_entry(mpt2sas_port,
  	   &sas_expander->sas_port_list, port_list) {
  
  		if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_EDGE_EXPANDER_DEVICE ||
  		    mpt2sas_port->remote_identify.device_type ==
  		    SAS_FANOUT_EXPANDER_DEVICE) {
  
  			spin_lock_irqsave(&ioc->sas_node_lock, flags);
  			expander_sibling =
  			    mpt2sas_scsih_expander_find_by_sas_address(
  			    ioc, mpt2sas_port->remote_identify.sas_address);
  			spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  			_scsih_block_io_to_children_attached_to_ex(ioc,
  			    expander_sibling);
  		}
  	}
  }
  
  /**
   * _scsih_block_io_to_children_attached_directly
   * @ioc: per adapter object
   * @event_data: topology change event data
   *
   * This routine set sdev state to SDEV_BLOCK for all devices
   * direct attached during device pull.
   */
  static void
  _scsih_block_io_to_children_attached_directly(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataSasTopologyChangeList_t *event_data)
  {
  	int i;
  	u16 handle;
  	u16 reason_code;
  	u8 phy_number;
  
  	for (i = 0; i < event_data->NumEntries; i++) {
  		handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
  		if (!handle)
  			continue;
  		phy_number = event_data->StartPhyNum + i;
  		reason_code = event_data->PHY[i].PhyStatus &
  		    MPI2_EVENT_SAS_TOPO_RC_MASK;
  		if (reason_code == MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING)
  			_scsih_block_io_device(ioc, handle);
  	}
  }
  
  /**
   * _scsih_tm_tr_send - send task management request
   * @ioc: per adapter object
   * @handle: device handle
   * Context: interrupt time.
   *
   * This code is to initiate the device removal handshake protocol
   * with controller firmware.  This function will issue target reset
   * using high priority request queue.  It will send a sas iounit
   * control request (MPI2_SAS_OP_REMOVE_DEVICE) from this completion.
   *
   * This is designed to send muliple task management request at the same
   * time to the fifo. If the fifo is full, we will append the request,
   * and process it in a future completion.
   */
  static void
  _scsih_tm_tr_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	Mpi2SCSITaskManagementRequest_t *mpi_request;
  	u16 smid;
  	struct _sas_device *sas_device;
  	struct MPT2SAS_TARGET *sas_target_priv_data = NULL;
  	u64 sas_address = 0;
  	unsigned long flags;
  	struct _tr_list *delayed_tr;
  	u32 ioc_state;
  
  	if (ioc->remove_host) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host has been "
  		    "removed: handle(0x%04x)\n", __func__, ioc->name, handle));
  		return;
  	} else if (ioc->pci_error_recovery) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host in pci "
  		    "error recovery: handle(0x%04x)\n", __func__, ioc->name,
  		    handle));
  		return;
  	}
  	ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
  	if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host is not "
  		   "operational: handle(0x%04x)\n", __func__, ioc->name,
  		   handle));
  		return;
  	}
  
  	/* if PD, then return */
  	if (test_bit(handle, ioc->pd_handles))
  		return;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	if (sas_device && sas_device->starget &&
  	     sas_device->starget->hostdata) {
  		sas_target_priv_data = sas_device->starget->hostdata;
  		sas_target_priv_data->deleted = 1;
  		sas_address = sas_device->sas_address;
  	}
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	if (sas_target_priv_data) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "setting delete flag: "
  		"handle(0x%04x), sas_addr(0x%016llx)\n", ioc->name, handle,
  			(unsigned long long)sas_address));
  		_scsih_ublock_io_device(ioc, handle);
  		sas_target_priv_data->handle = MPT2SAS_INVALID_DEVICE_HANDLE;
  	}
  
  	smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_tr_cb_idx);
  	if (!smid) {
  		delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
  		if (!delayed_tr)
  			return;
  		INIT_LIST_HEAD(&delayed_tr->list);
  		delayed_tr->handle = handle;
  		list_add_tail(&delayed_tr->list, &ioc->delayed_tr_list);
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  		    "DELAYED:tr:handle(0x%04x), (open)\n",
  		    ioc->name, handle));
  		return;
  	}
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "tr_send:handle(0x%04x), "
  	    "(open), smid(%d), cb(%d)\n", ioc->name, handle, smid,
  	    ioc->tm_tr_cb_idx));
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  	memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
  	mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
  	mpi_request->DevHandle = cpu_to_le16(handle);
  	mpi_request->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;
  	mpt2sas_base_put_smid_hi_priority(ioc, smid);
  }
  
  
  
  /**
   * _scsih_sas_control_complete - completion routine
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   * Context: interrupt time.
   *
   * This is the sas iounit control completion routine.
   * This code is part of the code to initiate the device removal
   * handshake protocol with controller firmware.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_sas_control_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid,
      u8 msix_index, u32 reply)
  {
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	Mpi2SasIoUnitControlReply_t *mpi_reply =
  	    mpt2sas_base_get_reply_virt_addr(ioc, reply);
  #endif
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  	    "sc_complete:handle(0x%04x), (open) "
  	    "smid(%d), ioc_status(0x%04x), loginfo(0x%08x)\n",
  	    ioc->name, le16_to_cpu(mpi_reply->DevHandle), smid,
  	    le16_to_cpu(mpi_reply->IOCStatus),
  	    le32_to_cpu(mpi_reply->IOCLogInfo)));
  	return 1;
  }
  
  /**
   * _scsih_tm_tr_volume_send - send target reset request for volumes
   * @ioc: per adapter object
   * @handle: device handle
   * Context: interrupt time.
   *
   * This is designed to send muliple task management request at the same
   * time to the fifo. If the fifo is full, we will append the request,
   * and process it in a future completion.
   */
  static void
  _scsih_tm_tr_volume_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	Mpi2SCSITaskManagementRequest_t *mpi_request;
  	u16 smid;
  	struct _tr_list *delayed_tr;
  
  	if (ioc->shost_recovery || ioc->remove_host ||
  	    ioc->pci_error_recovery) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host reset in "
  		   "progress!\n", __func__, ioc->name));
  		return;
  	}
  
  	smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_tr_volume_cb_idx);
  	if (!smid) {
  		delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
  		if (!delayed_tr)
  			return;
  		INIT_LIST_HEAD(&delayed_tr->list);
  		delayed_tr->handle = handle;
  		list_add_tail(&delayed_tr->list, &ioc->delayed_tr_volume_list);
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  		    "DELAYED:tr:handle(0x%04x), (open)\n",
  		    ioc->name, handle));
  		return;
  	}
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "tr_send:handle(0x%04x), "
  	    "(open), smid(%d), cb(%d)\n", ioc->name, handle, smid,
  	    ioc->tm_tr_volume_cb_idx));
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  	memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
  	mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
  	mpi_request->DevHandle = cpu_to_le16(handle);
  	mpi_request->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;
  	mpt2sas_base_put_smid_hi_priority(ioc, smid);
  }
  
  /**
   * _scsih_tm_volume_tr_complete - target reset completion
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   * Context: interrupt time.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_tm_volume_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid,
      u8 msix_index, u32 reply)
  {
  	u16 handle;
  	Mpi2SCSITaskManagementRequest_t *mpi_request_tm;
  	Mpi2SCSITaskManagementReply_t *mpi_reply =
  	    mpt2sas_base_get_reply_virt_addr(ioc, reply);
  
  	if (ioc->shost_recovery || ioc->remove_host ||
  	    ioc->pci_error_recovery) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host reset in "
  		   "progress!\n", __func__, ioc->name));
  		return 1;
  	}
  
  	mpi_request_tm = mpt2sas_base_get_msg_frame(ioc, smid);
  	handle = le16_to_cpu(mpi_request_tm->DevHandle);
  	if (handle != le16_to_cpu(mpi_reply->DevHandle)) {
  		dewtprintk(ioc, printk("spurious interrupt: "
  		    "handle(0x%04x:0x%04x), smid(%d)!!!\n", handle,
  		    le16_to_cpu(mpi_reply->DevHandle), smid));
  		return 0;
  	}
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  	    "tr_complete:handle(0x%04x), (open) smid(%d), ioc_status(0x%04x), "
  	    "loginfo(0x%08x), completed(%d)\n", ioc->name,
  	    handle, smid, le16_to_cpu(mpi_reply->IOCStatus),
  	    le32_to_cpu(mpi_reply->IOCLogInfo),
  	    le32_to_cpu(mpi_reply->TerminationCount)));
  
  	return _scsih_check_for_pending_tm(ioc, smid);
  }
  
  /**
   * _scsih_tm_tr_complete -
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   * Context: interrupt time.
   *
   * This is the target reset completion routine.
   * This code is part of the code to initiate the device removal
   * handshake protocol with controller firmware.
   * It will send a sas iounit control request (MPI2_SAS_OP_REMOVE_DEVICE)
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_tm_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
      u32 reply)
  {
  	u16 handle;
  	Mpi2SCSITaskManagementRequest_t *mpi_request_tm;
  	Mpi2SCSITaskManagementReply_t *mpi_reply =
  	    mpt2sas_base_get_reply_virt_addr(ioc, reply);
  	Mpi2SasIoUnitControlRequest_t *mpi_request;
  	u16 smid_sas_ctrl;
  	u32 ioc_state;
  
  	if (ioc->remove_host) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host has been "
  		   "removed\n", __func__, ioc->name));
  		return 1;
  	} else if (ioc->pci_error_recovery) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host in pci "
  		    "error recovery\n", __func__, ioc->name));
  		return 1;
  	}
  	ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
  	if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host is not "
  		    "operational\n", __func__, ioc->name));
  		return 1;
  	}
  
  	mpi_request_tm = mpt2sas_base_get_msg_frame(ioc, smid);
  	handle = le16_to_cpu(mpi_request_tm->DevHandle);
  	if (handle != le16_to_cpu(mpi_reply->DevHandle)) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "spurious interrupt: "
  		    "handle(0x%04x:0x%04x), smid(%d)!!!\n", ioc->name, handle,
  		    le16_to_cpu(mpi_reply->DevHandle), smid));
  		return 0;
  	}
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  	    "tr_complete:handle(0x%04x), (open) smid(%d), ioc_status(0x%04x), "
  	    "loginfo(0x%08x), completed(%d)\n", ioc->name,
  	    handle, smid, le16_to_cpu(mpi_reply->IOCStatus),
  	    le32_to_cpu(mpi_reply->IOCLogInfo),
  	    le32_to_cpu(mpi_reply->TerminationCount)));
  
  	smid_sas_ctrl = mpt2sas_base_get_smid(ioc, ioc->tm_sas_control_cb_idx);
  	if (!smid_sas_ctrl) {
  		printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
  		    ioc->name, __func__);
  		return 1;
  	}
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "sc_send:handle(0x%04x), "
  	    "(open), smid(%d), cb(%d)\n", ioc->name, handle, smid_sas_ctrl,
  	    ioc->tm_sas_control_cb_idx));
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid_sas_ctrl);
  	memset(mpi_request, 0, sizeof(Mpi2SasIoUnitControlRequest_t));
  	mpi_request->Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
  	mpi_request->Operation = MPI2_SAS_OP_REMOVE_DEVICE;
  	mpi_request->DevHandle = mpi_request_tm->DevHandle;
  	mpt2sas_base_put_smid_default(ioc, smid_sas_ctrl);
  
  	return _scsih_check_for_pending_tm(ioc, smid);
  }
  
  /**
   * _scsih_check_for_pending_tm - check for pending task management
   * @ioc: per adapter object
   * @smid: system request message index
   *
   * This will check delayed target reset list, and feed the
   * next reqeust.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_check_for_pending_tm(struct MPT2SAS_ADAPTER *ioc, u16 smid)
  {
  	struct _tr_list *delayed_tr;
  
  	if (!list_empty(&ioc->delayed_tr_volume_list)) {
  		delayed_tr = list_entry(ioc->delayed_tr_volume_list.next,
  		    struct _tr_list, list);
  		mpt2sas_base_free_smid(ioc, smid);
  		_scsih_tm_tr_volume_send(ioc, delayed_tr->handle);
  		list_del(&delayed_tr->list);
  		kfree(delayed_tr);
  		return 0;
  	}
  
  	if (!list_empty(&ioc->delayed_tr_list)) {
  		delayed_tr = list_entry(ioc->delayed_tr_list.next,
  		    struct _tr_list, list);
  		mpt2sas_base_free_smid(ioc, smid);
  		_scsih_tm_tr_send(ioc, delayed_tr->handle);
  		list_del(&delayed_tr->list);
  		kfree(delayed_tr);
  		return 0;
  	}
  
  	return 1;
  }
  
  /**
   * _scsih_check_topo_delete_events - sanity check on topo events
   * @ioc: per adapter object
   * @event_data: the event data payload
   *
   * This routine added to better handle cable breaker.
   *
   * This handles the case where driver receives multiple expander
   * add and delete events in a single shot.  When there is a delete event
   * the routine will void any pending add events waiting in the event queue.
   *
   * Return nothing.
   */
  static void
  _scsih_check_topo_delete_events(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataSasTopologyChangeList_t *event_data)
  {
  	struct fw_event_work *fw_event;
  	Mpi2EventDataSasTopologyChangeList_t *local_event_data;
  	u16 expander_handle;
  	struct _sas_node *sas_expander;
  	unsigned long flags;
  	int i, reason_code;
  	u16 handle;
  
  	for (i = 0 ; i < event_data->NumEntries; i++) {
  		handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
  		if (!handle)
  			continue;
  		reason_code = event_data->PHY[i].PhyStatus &
  		    MPI2_EVENT_SAS_TOPO_RC_MASK;
  		if (reason_code == MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING)
  			_scsih_tm_tr_send(ioc, handle);
  	}
  
  	expander_handle = le16_to_cpu(event_data->ExpanderDevHandle);
  	if (expander_handle < ioc->sas_hba.num_phys) {
  		_scsih_block_io_to_children_attached_directly(ioc, event_data);
  		return;
  	}
  
  	if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_DELAY_NOT_RESPONDING
  	 || event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING) {
  		spin_lock_irqsave(&ioc->sas_node_lock, flags);
  		sas_expander = mpt2sas_scsih_expander_find_by_handle(ioc,
  		    expander_handle);
  		spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  		_scsih_block_io_to_children_attached_to_ex(ioc, sas_expander);
  	} else if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_RESPONDING)
  		_scsih_block_io_to_children_attached_directly(ioc, event_data);
  
  	if (event_data->ExpStatus != MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING)
  		return;
  
  	/* mark ignore flag for pending events */
  	spin_lock_irqsave(&ioc->fw_event_lock, flags);
  	list_for_each_entry(fw_event, &ioc->fw_event_list, list) {
  		if (fw_event->event != MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST ||
  		    fw_event->ignore)
  			continue;
  		local_event_data = fw_event->event_data;
  		if (local_event_data->ExpStatus ==
  		    MPI2_EVENT_SAS_TOPO_ES_ADDED ||
  		    local_event_data->ExpStatus ==
  		    MPI2_EVENT_SAS_TOPO_ES_RESPONDING) {
  			if (le16_to_cpu(local_event_data->ExpanderDevHandle) ==
  			    expander_handle) {
  				dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  				    "setting ignoring flag\n", ioc->name));
  				fw_event->ignore = 1;
  			}
  		}
  	}
  	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
  }
  
  /**
   * _scsih_set_volume_delete_flag - setting volume delete flag
   * @ioc: per adapter object
   * @handle: device handle
   *
   * This
   * Return nothing.
   */
  static void
  _scsih_set_volume_delete_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _raid_device *raid_device;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
  	if (raid_device && raid_device->starget &&
  	    raid_device->starget->hostdata) {
  		sas_target_priv_data =
  		    raid_device->starget->hostdata;
  		sas_target_priv_data->deleted = 1;
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  		    "setting delete flag: handle(0x%04x), "
  		    "wwid(0x%016llx)\n", ioc->name, handle,
  		    (unsigned long long) raid_device->wwid));
  	}
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  }
  
  /**
   * _scsih_set_volume_handle_for_tr - set handle for target reset to volume
   * @handle: input handle
   * @a: handle for volume a
   * @b: handle for volume b
   *
   * IR firmware only supports two raid volumes.  The purpose of this
   * routine is to set the volume handle in either a or b. When the given
   * input handle is non-zero, or when a and b have not been set before.
   */
  static void
  _scsih_set_volume_handle_for_tr(u16 handle, u16 *a, u16 *b)
  {
  	if (!handle || handle == *a || handle == *b)
  		return;
  	if (!*a)
  		*a = handle;
  	else if (!*b)
  		*b = handle;
  }
  
  /**
   * _scsih_check_ir_config_unhide_events - check for UNHIDE events
   * @ioc: per adapter object
   * @event_data: the event data payload
   * Context: interrupt time.
   *
   * This routine will send target reset to volume, followed by target
   * resets to the PDs. This is called when a PD has been removed, or
   * volume has been deleted or removed. When the target reset is sent
   * to volume, the PD target resets need to be queued to start upon
   * completion of the volume target reset.
   *
   * Return nothing.
   */
  static void
  _scsih_check_ir_config_unhide_events(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataIrConfigChangeList_t *event_data)
  {
  	Mpi2EventIrConfigElement_t *element;
  	int i;
  	u16 handle, volume_handle, a, b;
  	struct _tr_list *delayed_tr;
  
  	a = 0;
  	b = 0;
  
  	if (ioc->is_warpdrive)
  		return;
  
  	/* Volume Resets for Deleted or Removed */
  	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
  	for (i = 0; i < event_data->NumElements; i++, element++) {
  		if (element->ReasonCode ==
  		    MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED ||
  		    element->ReasonCode ==
  		    MPI2_EVENT_IR_CHANGE_RC_REMOVED) {
  			volume_handle = le16_to_cpu(element->VolDevHandle);
  			_scsih_set_volume_delete_flag(ioc, volume_handle);
  			_scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
  		}
  	}
  
  	/* Volume Resets for UNHIDE events */
  	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
  	for (i = 0; i < event_data->NumElements; i++, element++) {
  		if (le32_to_cpu(event_data->Flags) &
  		    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG)
  			continue;
  		if (element->ReasonCode == MPI2_EVENT_IR_CHANGE_RC_UNHIDE) {
  			volume_handle = le16_to_cpu(element->VolDevHandle);
  			_scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
  		}
  	}
  
  	if (a)
  		_scsih_tm_tr_volume_send(ioc, a);
  	if (b)
  		_scsih_tm_tr_volume_send(ioc, b);
  
  	/* PD target resets */
  	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
  	for (i = 0; i < event_data->NumElements; i++, element++) {
  		if (element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_UNHIDE)
  			continue;
  		handle = le16_to_cpu(element->PhysDiskDevHandle);
  		volume_handle = le16_to_cpu(element->VolDevHandle);
  		clear_bit(handle, ioc->pd_handles);
  		if (!volume_handle)
  			_scsih_tm_tr_send(ioc, handle);
  		else if (volume_handle == a || volume_handle == b) {
  			delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
  			BUG_ON(!delayed_tr);
  			INIT_LIST_HEAD(&delayed_tr->list);
  			delayed_tr->handle = handle;
  			list_add_tail(&delayed_tr->list, &ioc->delayed_tr_list);
  			dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  			    "DELAYED:tr:handle(0x%04x), (open)\n", ioc->name,
  			    handle));
  		} else
  			_scsih_tm_tr_send(ioc, handle);
  	}
  }
  
  
  /**
   * _scsih_check_volume_delete_events - set delete flag for volumes
   * @ioc: per adapter object
   * @event_data: the event data payload
   * Context: interrupt time.
   *
   * This will handle the case when the cable connected to entire volume is
   * pulled. We will take care of setting the deleted flag so normal IO will
   * not be sent.
   *
   * Return nothing.
   */
  static void
  _scsih_check_volume_delete_events(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataIrVolume_t *event_data)
  {
  	u32 state;
  
  	if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
  		return;
  	state = le32_to_cpu(event_data->NewValue);
  	if (state == MPI2_RAID_VOL_STATE_MISSING || state ==
  	    MPI2_RAID_VOL_STATE_FAILED)
  		_scsih_set_volume_delete_flag(ioc,
  		    le16_to_cpu(event_data->VolDevHandle));
  }
  
  /**
   * _scsih_flush_running_cmds - completing outstanding commands.
   * @ioc: per adapter object
   *
   * The flushing out of all pending scmd commands following host reset,
   * where all IO is dropped to the floor.
   *
   * Return nothing.
   */
  static void
  _scsih_flush_running_cmds(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct scsi_cmnd *scmd;
  	u16 smid;
  	u16 count = 0;
  
  	for (smid = 1; smid <= ioc->scsiio_depth; smid++) {
  		scmd = _scsih_scsi_lookup_get_clear(ioc, smid);
  		if (!scmd)
  			continue;
  		count++;
  		mpt2sas_base_free_smid(ioc, smid);
  		scsi_dma_unmap(scmd);
  		if (ioc->pci_error_recovery)
  			scmd->result = DID_NO_CONNECT << 16;
  		else
  			scmd->result = DID_RESET << 16;
  		scmd->scsi_done(scmd);
  	}
  	dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "completing %d cmds\n",
  	    ioc->name, count));
  }
  
  /**
   * _scsih_setup_eedp - setup MPI request for EEDP transfer
   * @scmd: pointer to scsi command object
   * @mpi_request: pointer to the SCSI_IO reqest message frame
   *
   * Supporting protection 1 and 3.
   *
   * Returns nothing
   */
  static void
  _scsih_setup_eedp(struct scsi_cmnd *scmd, Mpi2SCSIIORequest_t *mpi_request)
  {
  	u16 eedp_flags;
  	unsigned char prot_op = scsi_get_prot_op(scmd);
  	unsigned char prot_type = scsi_get_prot_type(scmd);
  
  	if (prot_type == SCSI_PROT_DIF_TYPE0 || prot_op == SCSI_PROT_NORMAL)
  		return;
  
  	if (prot_op ==  SCSI_PROT_READ_STRIP)
  		eedp_flags = MPI2_SCSIIO_EEDPFLAGS_CHECK_REMOVE_OP;
  	else if (prot_op ==  SCSI_PROT_WRITE_INSERT)
  		eedp_flags = MPI2_SCSIIO_EEDPFLAGS_INSERT_OP;
  	else
  		return;
  
  	switch (prot_type) {
  	case SCSI_PROT_DIF_TYPE1:
  	case SCSI_PROT_DIF_TYPE2:
  
  		/*
  		* enable ref/guard checking
  		* auto increment ref tag
  		*/
  		eedp_flags |= MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG |
  		    MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
  		    MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD;
  		mpi_request->CDB.EEDP32.PrimaryReferenceTag =
  		    cpu_to_be32(scsi_get_lba(scmd));
  		break;
  
  	case SCSI_PROT_DIF_TYPE3:
  
  		/*
  		* enable guard checking
  		*/
  		eedp_flags |= MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD;
  		break;
  	}
  	mpi_request->EEDPBlockSize = cpu_to_le32(scmd->device->sector_size);
  	mpi_request->EEDPFlags = cpu_to_le16(eedp_flags);
  }
  
  /**
   * _scsih_eedp_error_handling - return sense code for EEDP errors
   * @scmd: pointer to scsi command object
   * @ioc_status: ioc status
   *
   * Returns nothing
   */
  static void
  _scsih_eedp_error_handling(struct scsi_cmnd *scmd, u16 ioc_status)
  {
  	u8 ascq;
  	u8 sk;
  	u8 host_byte;
  
  	switch (ioc_status) {
  	case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
  		ascq = 0x01;
  		break;
  	case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
  		ascq = 0x02;
  		break;
  	case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
  		ascq = 0x03;
  		break;
  	default:
  		ascq = 0x00;
  		break;
  	}
  
  	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
  		sk = ILLEGAL_REQUEST;
  		host_byte = DID_ABORT;
  	} else {
  		sk = ABORTED_COMMAND;
  		host_byte = DID_OK;
  	}
  
  	scsi_build_sense_buffer(0, scmd->sense_buffer, sk, 0x10, ascq);
  	scmd->result = DRIVER_SENSE << 24 | (host_byte << 16) |
  	    SAM_STAT_CHECK_CONDITION;
  }
  
  /**
   * _scsih_scsi_direct_io_get - returns direct io flag
   * @ioc: per adapter object
   * @smid: system request message index
   *
   * Returns the smid stored scmd pointer.
   */
  static inline u8
  _scsih_scsi_direct_io_get(struct MPT2SAS_ADAPTER *ioc, u16 smid)
  {
  	return ioc->scsi_lookup[smid - 1].direct_io;
  }
  
  /**
   * _scsih_scsi_direct_io_set - sets direct io flag
   * @ioc: per adapter object
   * @smid: system request message index
   * @direct_io: Zero or non-zero value to set in the direct_io flag
   *
   * Returns Nothing.
   */
  static inline void
  _scsih_scsi_direct_io_set(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 direct_io)
  {
  	ioc->scsi_lookup[smid - 1].direct_io = direct_io;
  }
  
  
  /**
   * _scsih_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
   * @ioc: per adapter object
   * @scmd: pointer to scsi command object
   * @raid_device: pointer to raid device data structure
   * @mpi_request: pointer to the SCSI_IO reqest message frame
   * @smid: system request message index
   *
   * Returns nothing
   */
  static void
  _scsih_setup_direct_io(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
  	struct _raid_device *raid_device, Mpi2SCSIIORequest_t *mpi_request,
  	u16 smid)
  {
  	u32 v_lba, p_lba, stripe_off, stripe_unit, column, io_size;
  	u32 stripe_sz, stripe_exp;
  	u8 num_pds, *cdb_ptr, i;
  	u8 cdb0 = scmd->cmnd[0];
  	u64 v_llba;
  
  	/*
  	 * Try Direct I/O to RAID memeber disks
  	 */
  	if (cdb0 == READ_16 || cdb0 == READ_10 ||
  	    cdb0 == WRITE_16 || cdb0 == WRITE_10) {
  		cdb_ptr = mpi_request->CDB.CDB32;
  
  		if ((cdb0 < READ_16) || !(cdb_ptr[2] | cdb_ptr[3] | cdb_ptr[4]
  			| cdb_ptr[5])) {
  			io_size = scsi_bufflen(scmd) >>
  			    raid_device->block_exponent;
  			i = (cdb0 < READ_16) ? 2 : 6;
  			/* get virtual lba */
  			v_lba = be32_to_cpu(*(__be32 *)(&cdb_ptr[i]));
  
  			if (((u64)v_lba + (u64)io_size - 1) <=
  			    (u32)raid_device->max_lba) {
  				stripe_sz = raid_device->stripe_sz;
  				stripe_exp = raid_device->stripe_exponent;
  				stripe_off = v_lba & (stripe_sz - 1);
  
  				/* Check whether IO falls within a stripe */
  				if ((stripe_off + io_size) <= stripe_sz) {
  					num_pds = raid_device->num_pds;
  					p_lba = v_lba >> stripe_exp;
  					stripe_unit = p_lba / num_pds;
  					column = p_lba % num_pds;
  					p_lba = (stripe_unit << stripe_exp) +
  					    stripe_off;
  					mpi_request->DevHandle =
  						cpu_to_le16(raid_device->
  						    pd_handle[column]);
  					(*(__be32 *)(&cdb_ptr[i])) =
  						cpu_to_be32(p_lba);
  					/*
  					* WD: To indicate this I/O is directI/O
  					*/
  					_scsih_scsi_direct_io_set(ioc, smid, 1);
  				}
  			}
  		} else {
  			io_size = scsi_bufflen(scmd) >>
  			    raid_device->block_exponent;
  			/* get virtual lba */
  			v_llba = be64_to_cpu(*(__be64 *)(&cdb_ptr[2]));
  
  			if ((v_llba + (u64)io_size - 1) <=
  			    raid_device->max_lba) {
  				stripe_sz = raid_device->stripe_sz;
  				stripe_exp = raid_device->stripe_exponent;
  				stripe_off = (u32) (v_llba & (stripe_sz - 1));
  
  				/* Check whether IO falls within a stripe */
  				if ((stripe_off + io_size) <= stripe_sz) {
  					num_pds = raid_device->num_pds;
  					p_lba = (u32)(v_llba >> stripe_exp);
  					stripe_unit = p_lba / num_pds;
  					column = p_lba % num_pds;
  					p_lba = (stripe_unit << stripe_exp) +
  					    stripe_off;
  					mpi_request->DevHandle =
  						cpu_to_le16(raid_device->
  						    pd_handle[column]);
  					(*(__be64 *)(&cdb_ptr[2])) =
  					    cpu_to_be64((u64)p_lba);
  					/*
  					* WD: To indicate this I/O is directI/O
  					*/
  					_scsih_scsi_direct_io_set(ioc, smid, 1);
  				}
  			}
  		}
  	}
  }
  
  /**
   * _scsih_qcmd - main scsi request entry point
   * @scmd: pointer to scsi command object
   * @done: function pointer to be invoked on completion
   *
   * The callback index is set inside `ioc->scsi_io_cb_idx`.
   *
   * Returns 0 on success.  If there's a failure, return either:
   * SCSI_MLQUEUE_DEVICE_BUSY if the device queue is full, or
   * SCSI_MLQUEUE_HOST_BUSY if the entire host queue is full
   */
  static int
  _scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct _raid_device *raid_device;
  	Mpi2SCSIIORequest_t *mpi_request;
  	u32 mpi_control;
  	u16 smid;
  
  	scmd->scsi_done = done;
  	sas_device_priv_data = scmd->device->hostdata;
  	if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		return 0;
  	}
  
  	if (ioc->pci_error_recovery || ioc->remove_host) {
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		return 0;
  	}
  
  	sas_target_priv_data = sas_device_priv_data->sas_target;
  	/* invalid device handle */
  	if (sas_target_priv_data->handle == MPT2SAS_INVALID_DEVICE_HANDLE) {
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		return 0;
  	}
  
  	/* host recovery or link resets sent via IOCTLs */
  	if (ioc->shost_recovery || ioc->ioc_link_reset_in_progress)
  		return SCSI_MLQUEUE_HOST_BUSY;
  	/* device busy with task management */
  	else if (sas_device_priv_data->block || sas_target_priv_data->tm_busy)
  		return SCSI_MLQUEUE_DEVICE_BUSY;
  	/* device has been deleted */
  	else if (sas_target_priv_data->deleted) {
  		scmd->result = DID_NO_CONNECT << 16;
  		scmd->scsi_done(scmd);
  		return 0;
  	}
  
  	if (scmd->sc_data_direction == DMA_FROM_DEVICE)
  		mpi_control = MPI2_SCSIIO_CONTROL_READ;
  	else if (scmd->sc_data_direction == DMA_TO_DEVICE)
  		mpi_control = MPI2_SCSIIO_CONTROL_WRITE;
  	else
  		mpi_control = MPI2_SCSIIO_CONTROL_NODATATRANSFER;
  
  	/* set tags */
  	if (!(sas_device_priv_data->flags & MPT_DEVICE_FLAGS_INIT)) {
  		if (scmd->device->tagged_supported) {
  			if (scmd->device->ordered_tags)
  				mpi_control |= MPI2_SCSIIO_CONTROL_ORDEREDQ;
  			else
  				mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
  		} else
  			mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
  	} else
  		mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
  	/* Make sure Device is not raid volume.
  	 * We do not expose raid functionality to upper layer for warpdrive.
  	 */
  	if (!ioc->is_warpdrive && !_scsih_is_raid(&scmd->device->sdev_gendev) &&
  	    sas_is_tlr_enabled(scmd->device) && scmd->cmd_len != 32)
  		mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;
  
  	smid = mpt2sas_base_get_smid_scsiio(ioc, ioc->scsi_io_cb_idx, scmd);
  	if (!smid) {
  		printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
  		    ioc->name, __func__);
  		goto out;
  	}
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  	memset(mpi_request, 0, sizeof(Mpi2SCSIIORequest_t));
  	_scsih_setup_eedp(scmd, mpi_request);
  	if (scmd->cmd_len == 32)
  		mpi_control |= 4 << MPI2_SCSIIO_CONTROL_ADDCDBLEN_SHIFT;
  	mpi_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
  	if (sas_device_priv_data->sas_target->flags &
  	    MPT_TARGET_FLAGS_RAID_COMPONENT)
  		mpi_request->Function = MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH;
  	else
  		mpi_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
  	mpi_request->DevHandle =
  	    cpu_to_le16(sas_device_priv_data->sas_target->handle);
  	mpi_request->DataLength = cpu_to_le32(scsi_bufflen(scmd));
  	mpi_request->Control = cpu_to_le32(mpi_control);
  	mpi_request->IoFlags = cpu_to_le16(scmd->cmd_len);
  	mpi_request->MsgFlags = MPI2_SCSIIO_MSGFLAGS_SYSTEM_SENSE_ADDR;
  	mpi_request->SenseBufferLength = SCSI_SENSE_BUFFERSIZE;
  	mpi_request->SenseBufferLowAddress =
  	    mpt2sas_base_get_sense_buffer_dma(ioc, smid);
  	mpi_request->SGLOffset0 = offsetof(Mpi2SCSIIORequest_t, SGL) / 4;
  	mpi_request->SGLFlags = cpu_to_le16(MPI2_SCSIIO_SGLFLAGS_TYPE_MPI +
  	    MPI2_SCSIIO_SGLFLAGS_SYSTEM_ADDR);
  	mpi_request->VF_ID = 0; /* TODO */
  	mpi_request->VP_ID = 0;
  	int_to_scsilun(sas_device_priv_data->lun, (struct scsi_lun *)
  	    mpi_request->LUN);
  	memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);
  
  	if (!mpi_request->DataLength) {
  		mpt2sas_base_build_zero_len_sge(ioc, &mpi_request->SGL);
  	} else {
  		if (_scsih_build_scatter_gather(ioc, scmd, smid)) {
  			mpt2sas_base_free_smid(ioc, smid);
  			goto out;
  		}
  	}
  
  	raid_device = sas_target_priv_data->raid_device;
  	if (raid_device && raid_device->direct_io_enabled)
  		_scsih_setup_direct_io(ioc, scmd, raid_device, mpi_request,
  		    smid);
  
  	if (likely(mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST))
  		mpt2sas_base_put_smid_scsi_io(ioc, smid,
  		    le16_to_cpu(mpi_request->DevHandle));
  	else
  		mpt2sas_base_put_smid_default(ioc, smid);
  	return 0;
  
   out:
  	return SCSI_MLQUEUE_HOST_BUSY;
  }
  
  static DEF_SCSI_QCMD(_scsih_qcmd)
  
  /**
   * _scsih_normalize_sense - normalize descriptor and fixed format sense data
   * @sense_buffer: sense data returned by target
   * @data: normalized skey/asc/ascq
   *
   * Return nothing.
   */
  static void
  _scsih_normalize_sense(char *sense_buffer, struct sense_info *data)
  {
  	if ((sense_buffer[0] & 0x7F) >= 0x72) {
  		/* descriptor format */
  		data->skey = sense_buffer[1] & 0x0F;
  		data->asc = sense_buffer[2];
  		data->ascq = sense_buffer[3];
  	} else {
  		/* fixed format */
  		data->skey = sense_buffer[2] & 0x0F;
  		data->asc = sense_buffer[12];
  		data->ascq = sense_buffer[13];
  	}
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_scsi_ioc_info - translated non-successful SCSI_IO request
   * @ioc: per adapter object
   * @scmd: pointer to scsi command object
   * @mpi_reply: reply mf payload returned from firmware
   *
   * scsi_status - SCSI Status code returned from target device
   * scsi_state - state info associated with SCSI_IO determined by ioc
   * ioc_status - ioc supplied status info
   *
   * Return nothing.
   */
  static void
  _scsih_scsi_ioc_info(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
      Mpi2SCSIIOReply_t *mpi_reply, u16 smid)
  {
  	u32 response_info;
  	u8 *response_bytes;
  	u16 ioc_status = le16_to_cpu(mpi_reply->IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	u8 scsi_state = mpi_reply->SCSIState;
  	u8 scsi_status = mpi_reply->SCSIStatus;
  	char *desc_ioc_state = NULL;
  	char *desc_scsi_status = NULL;
  	char *desc_scsi_state = ioc->tmp_string;
  	u32 log_info = le32_to_cpu(mpi_reply->IOCLogInfo);
  	struct _sas_device *sas_device = NULL;
  	unsigned long flags;
  	struct scsi_target *starget = scmd->device->sdev_target;
  	struct MPT2SAS_TARGET *priv_target = starget->hostdata;
  	char *device_str = NULL;
  
  	if (!priv_target)
  		return;
  
  	if (ioc->hide_ir_msg)
  		device_str = "WarpDrive";
  	else
  		device_str = "volume";
  
  	if (log_info == 0x31170000)
  		return;
  
  	switch (ioc_status) {
  	case MPI2_IOCSTATUS_SUCCESS:
  		desc_ioc_state = "success";
  		break;
  	case MPI2_IOCSTATUS_INVALID_FUNCTION:
  		desc_ioc_state = "invalid function";
  		break;
  	case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
  		desc_ioc_state = "scsi recovered error";
  		break;
  	case MPI2_IOCSTATUS_SCSI_INVALID_DEVHANDLE:
  		desc_ioc_state = "scsi invalid dev handle";
  		break;
  	case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
  		desc_ioc_state = "scsi device not there";
  		break;
  	case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
  		desc_ioc_state = "scsi data overrun";
  		break;
  	case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
  		desc_ioc_state = "scsi data underrun";
  		break;
  	case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
  		desc_ioc_state = "scsi io data error";
  		break;
  	case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
  		desc_ioc_state = "scsi protocol error";
  		break;
  	case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
  		desc_ioc_state = "scsi task terminated";
  		break;
  	case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
  		desc_ioc_state = "scsi residual mismatch";
  		break;
  	case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
  		desc_ioc_state = "scsi task mgmt failed";
  		break;
  	case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
  		desc_ioc_state = "scsi ioc terminated";
  		break;
  	case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
  		desc_ioc_state = "scsi ext terminated";
  		break;
  	case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
  		desc_ioc_state = "eedp guard error";
  		break;
  	case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
  		desc_ioc_state = "eedp ref tag error";
  		break;
  	case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
  		desc_ioc_state = "eedp app tag error";
  		break;
  	default:
  		desc_ioc_state = "unknown";
  		break;
  	}
  
  	switch (scsi_status) {
  	case MPI2_SCSI_STATUS_GOOD:
  		desc_scsi_status = "good";
  		break;
  	case MPI2_SCSI_STATUS_CHECK_CONDITION:
  		desc_scsi_status = "check condition";
  		break;
  	case MPI2_SCSI_STATUS_CONDITION_MET:
  		desc_scsi_status = "condition met";
  		break;
  	case MPI2_SCSI_STATUS_BUSY:
  		desc_scsi_status = "busy";
  		break;
  	case MPI2_SCSI_STATUS_INTERMEDIATE:
  		desc_scsi_status = "intermediate";
  		break;
  	case MPI2_SCSI_STATUS_INTERMEDIATE_CONDMET:
  		desc_scsi_status = "intermediate condmet";
  		break;
  	case MPI2_SCSI_STATUS_RESERVATION_CONFLICT:
  		desc_scsi_status = "reservation conflict";
  		break;
  	case MPI2_SCSI_STATUS_COMMAND_TERMINATED:
  		desc_scsi_status = "command terminated";
  		break;
  	case MPI2_SCSI_STATUS_TASK_SET_FULL:
  		desc_scsi_status = "task set full";
  		break;
  	case MPI2_SCSI_STATUS_ACA_ACTIVE:
  		desc_scsi_status = "aca active";
  		break;
  	case MPI2_SCSI_STATUS_TASK_ABORTED:
  		desc_scsi_status = "task aborted";
  		break;
  	default:
  		desc_scsi_status = "unknown";
  		break;
  	}
  
  	desc_scsi_state[0] = '\0';
  	if (!scsi_state)
  		desc_scsi_state = " ";
  	if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID)
  		strcat(desc_scsi_state, "response info ");
  	if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
  		strcat(desc_scsi_state, "state terminated ");
  	if (scsi_state & MPI2_SCSI_STATE_NO_SCSI_STATUS)
  		strcat(desc_scsi_state, "no status ");
  	if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_FAILED)
  		strcat(desc_scsi_state, "autosense failed ");
  	if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID)
  		strcat(desc_scsi_state, "autosense valid ");
  
  	scsi_print_command(scmd);
  
  	if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
  		printk(MPT2SAS_WARN_FMT "\t%s wwid(0x%016llx)\n", ioc->name,
  		    device_str, (unsigned long long)priv_target->sas_address);
  	} else {
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  		    priv_target->sas_address);
  		if (sas_device) {
  			printk(MPT2SAS_WARN_FMT "\tsas_address(0x%016llx), "
  			    "phy(%d)\n", ioc->name, sas_device->sas_address,
  			    sas_device->phy);
  			printk(MPT2SAS_WARN_FMT
  			    "\tenclosure_logical_id(0x%016llx), slot(%d)\n",
  			    ioc->name, sas_device->enclosure_logical_id,
  			    sas_device->slot);
  		}
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	}
  
  	printk(MPT2SAS_WARN_FMT "\thandle(0x%04x), ioc_status(%s)(0x%04x), "
  	    "smid(%d)\n", ioc->name, le16_to_cpu(mpi_reply->DevHandle),
  	    desc_ioc_state, ioc_status, smid);
  	printk(MPT2SAS_WARN_FMT "\trequest_len(%d), underflow(%d), "
  	    "resid(%d)\n", ioc->name, scsi_bufflen(scmd), scmd->underflow,
  	    scsi_get_resid(scmd));
  	printk(MPT2SAS_WARN_FMT "\ttag(%d), transfer_count(%d), "
  	    "sc->result(0x%08x)\n", ioc->name, le16_to_cpu(mpi_reply->TaskTag),
  	    le32_to_cpu(mpi_reply->TransferCount), scmd->result);
  	printk(MPT2SAS_WARN_FMT "\tscsi_status(%s)(0x%02x), "
  	    "scsi_state(%s)(0x%02x)\n", ioc->name, desc_scsi_status,
  	    scsi_status, desc_scsi_state, scsi_state);
  
  	if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
  		struct sense_info data;
  		_scsih_normalize_sense(scmd->sense_buffer, &data);
  		printk(MPT2SAS_WARN_FMT "\t[sense_key,asc,ascq]: "
  		    "[0x%02x,0x%02x,0x%02x], count(%d)\n", ioc->name, data.skey,
  		    data.asc, data.ascq, le32_to_cpu(mpi_reply->SenseCount));
  	}
  
  	if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID) {
  		response_info = le32_to_cpu(mpi_reply->ResponseInfo);
  		response_bytes = (u8 *)&response_info;
  		_scsih_response_code(ioc, response_bytes[0]);
  	}
  }
  #endif
  
  /**
   * _scsih_turn_on_fault_led - illuminate Fault LED
   * @ioc: per adapter object
   * @handle: device handle
   * Context: process
   *
   * Return nothing.
   */
  static void
  _scsih_turn_on_fault_led(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	Mpi2SepReply_t mpi_reply;
  	Mpi2SepRequest_t mpi_request;
  
  	memset(&mpi_request, 0, sizeof(Mpi2SepRequest_t));
  	mpi_request.Function = MPI2_FUNCTION_SCSI_ENCLOSURE_PROCESSOR;
  	mpi_request.Action = MPI2_SEP_REQ_ACTION_WRITE_STATUS;
  	mpi_request.SlotStatus =
  	    cpu_to_le32(MPI2_SEP_REQ_SLOTSTATUS_PREDICTED_FAULT);
  	mpi_request.DevHandle = cpu_to_le16(handle);
  	mpi_request.Flags = MPI2_SEP_REQ_FLAGS_DEVHANDLE_ADDRESS;
  	if ((mpt2sas_base_scsi_enclosure_processor(ioc, &mpi_reply,
  	    &mpi_request)) != 0) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n", ioc->name,
  		__FILE__, __LINE__, __func__);
  		return;
  	}
  
  	if (mpi_reply.IOCStatus || mpi_reply.IOCLogInfo) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "enclosure_processor: "
  		    "ioc_status (0x%04x), loginfo(0x%08x)\n", ioc->name,
  		    le16_to_cpu(mpi_reply.IOCStatus),
  		    le32_to_cpu(mpi_reply.IOCLogInfo)));
  		return;
  	}
  }
  
  /**
   * _scsih_send_event_to_turn_on_fault_led - fire delayed event
   * @ioc: per adapter object
   * @handle: device handle
   * Context: interrupt.
   *
   * Return nothing.
   */
  static void
  _scsih_send_event_to_turn_on_fault_led(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct fw_event_work *fw_event;
  
  	fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
  	if (!fw_event)
  		return;
  	fw_event->event = MPT2SAS_TURN_ON_FAULT_LED;
  	fw_event->device_handle = handle;
  	fw_event->ioc = ioc;
  	_scsih_fw_event_add(ioc, fw_event);
  }
  
  /**
   * _scsih_smart_predicted_fault - process smart errors
   * @ioc: per adapter object
   * @handle: device handle
   * Context: interrupt.
   *
   * Return nothing.
   */
  static void
  _scsih_smart_predicted_fault(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct scsi_target *starget;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	Mpi2EventNotificationReply_t *event_reply;
  	Mpi2EventDataSasDeviceStatusChange_t *event_data;
  	struct _sas_device *sas_device;
  	ssize_t sz;
  	unsigned long flags;
  
  	/* only handle non-raid devices */
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	if (!sas_device) {
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  		return;
  	}
  	starget = sas_device->starget;
  	sas_target_priv_data = starget->hostdata;
  
  	if ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_RAID_COMPONENT) ||
  	   ((sas_target_priv_data->flags & MPT_TARGET_FLAGS_VOLUME))) {
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  		return;
  	}
  	starget_printk(KERN_WARNING, starget, "predicted fault\n");
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	if (ioc->pdev->subsystem_vendor == PCI_VENDOR_ID_IBM)
  		_scsih_send_event_to_turn_on_fault_led(ioc, handle);
  
  	/* insert into event log */
  	sz = offsetof(Mpi2EventNotificationReply_t, EventData) +
  	     sizeof(Mpi2EventDataSasDeviceStatusChange_t);
  	event_reply = kzalloc(sz, GFP_ATOMIC);
  	if (!event_reply) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	event_reply->Function = MPI2_FUNCTION_EVENT_NOTIFICATION;
  	event_reply->Event =
  	    cpu_to_le16(MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE);
  	event_reply->MsgLength = sz/4;
  	event_reply->EventDataLength =
  	    cpu_to_le16(sizeof(Mpi2EventDataSasDeviceStatusChange_t)/4);
  	event_data = (Mpi2EventDataSasDeviceStatusChange_t *)
  	    event_reply->EventData;
  	event_data->ReasonCode = MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA;
  	event_data->ASC = 0x5D;
  	event_data->DevHandle = cpu_to_le16(handle);
  	event_data->SASAddress = cpu_to_le64(sas_target_priv_data->sas_address);
  	mpt2sas_ctl_add_to_event_log(ioc, event_reply);
  	kfree(event_reply);
  }
  
  /**
   * _scsih_io_done - scsi request callback
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   *
   * Callback handler when using _scsih_qcmd.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
  {
  	Mpi2SCSIIORequest_t *mpi_request;
  	Mpi2SCSIIOReply_t *mpi_reply;
  	struct scsi_cmnd *scmd;
  	u16 ioc_status;
  	u32 xfer_cnt;
  	u8 scsi_state;
  	u8 scsi_status;
  	u32 log_info;
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	u32 response_code = 0;
  	unsigned long flags;
  
  	mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
  	scmd = _scsih_scsi_lookup_get_clear(ioc, smid);
  	if (scmd == NULL)
  		return 1;
  
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  
  	if (mpi_reply == NULL) {
  		scmd->result = DID_OK << 16;
  		goto out;
  	}
  
  	sas_device_priv_data = scmd->device->hostdata;
  	if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
  	     sas_device_priv_data->sas_target->deleted) {
  		scmd->result = DID_NO_CONNECT << 16;
  		goto out;
  	}
  	ioc_status = le16_to_cpu(mpi_reply->IOCStatus);
  	/*
  	 * WARPDRIVE: If direct_io is set then it is directIO,
  	 * the failed direct I/O should be redirected to volume
  	 */
  	if (_scsih_scsi_direct_io_get(ioc, smid) &&
  	    ((ioc_status & MPI2_IOCSTATUS_MASK)
  	    != MPI2_IOCSTATUS_SCSI_TASK_TERMINATED)) {
  		spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  		ioc->scsi_lookup[smid - 1].scmd = scmd;
  		spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  		_scsih_scsi_direct_io_set(ioc, smid, 0);
  		memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);
  		mpi_request->DevHandle =
  		    cpu_to_le16(sas_device_priv_data->sas_target->handle);
  		mpt2sas_base_put_smid_scsi_io(ioc, smid,
  		    sas_device_priv_data->sas_target->handle);
  		return 0;
  	}
  
  
  	/* turning off TLR */
  	scsi_state = mpi_reply->SCSIState;
  	if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID)
  		response_code =
  		    le32_to_cpu(mpi_reply->ResponseInfo) & 0xFF;
  	if (!sas_device_priv_data->tlr_snoop_check) {
  		sas_device_priv_data->tlr_snoop_check++;
  	/* Make sure Device is not raid volume.
  	 * We do not expose raid functionality to upper layer for warpdrive.
  	 */
  	if (!ioc->is_warpdrive && !_scsih_is_raid(&scmd->device->sdev_gendev) &&
  		sas_is_tlr_enabled(scmd->device) &&
  		    response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME) {
  			sas_disable_tlr(scmd->device);
  			sdev_printk(KERN_INFO, scmd->device, "TLR disabled\n");
  		}
  	}
  
  	xfer_cnt = le32_to_cpu(mpi_reply->TransferCount);
  	scsi_set_resid(scmd, scsi_bufflen(scmd) - xfer_cnt);
  	if (ioc_status & MPI2_IOCSTATUS_FLAG_LOG_INFO_AVAILABLE)
  		log_info =  le32_to_cpu(mpi_reply->IOCLogInfo);
  	else
  		log_info = 0;
  	ioc_status &= MPI2_IOCSTATUS_MASK;
  	scsi_status = mpi_reply->SCSIStatus;
  
  	if (ioc_status == MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN && xfer_cnt == 0 &&
  	    (scsi_status == MPI2_SCSI_STATUS_BUSY ||
  	     scsi_status == MPI2_SCSI_STATUS_RESERVATION_CONFLICT ||
  	     scsi_status == MPI2_SCSI_STATUS_TASK_SET_FULL)) {
  		ioc_status = MPI2_IOCSTATUS_SUCCESS;
  	}
  
  	if (scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
  		struct sense_info data;
  		const void *sense_data = mpt2sas_base_get_sense_buffer(ioc,
  		    smid);
  		u32 sz = min_t(u32, SCSI_SENSE_BUFFERSIZE,
  		    le32_to_cpu(mpi_reply->SenseCount));
  		memcpy(scmd->sense_buffer, sense_data, sz);
  		_scsih_normalize_sense(scmd->sense_buffer, &data);
  		/* failure prediction threshold exceeded */
  		if (data.asc == 0x5D)
  			_scsih_smart_predicted_fault(ioc,
  			    le16_to_cpu(mpi_reply->DevHandle));
  	}
  
  	switch (ioc_status) {
  	case MPI2_IOCSTATUS_BUSY:
  	case MPI2_IOCSTATUS_INSUFFICIENT_RESOURCES:
  		scmd->result = SAM_STAT_BUSY;
  		break;
  
  	case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
  		scmd->result = DID_NO_CONNECT << 16;
  		break;
  
  	case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
  		if (sas_device_priv_data->block) {
  			scmd->result = DID_TRANSPORT_DISRUPTED << 16;
  			goto out;
  		}
  		scmd->result = DID_SOFT_ERROR << 16;
  		break;
  	case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
  	case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
  		scmd->result = DID_RESET << 16;
  		break;
  
  	case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
  		if ((xfer_cnt == 0) || (scmd->underflow > xfer_cnt))
  			scmd->result = DID_SOFT_ERROR << 16;
  		else
  			scmd->result = (DID_OK << 16) | scsi_status;
  		break;
  
  	case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
  		scmd->result = (DID_OK << 16) | scsi_status;
  
  		if ((scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID))
  			break;
  
  		if (xfer_cnt < scmd->underflow) {
  			if (scsi_status == SAM_STAT_BUSY)
  				scmd->result = SAM_STAT_BUSY;
  			else
  				scmd->result = DID_SOFT_ERROR << 16;
  		} else if (scsi_state & (MPI2_SCSI_STATE_AUTOSENSE_FAILED |
  		     MPI2_SCSI_STATE_NO_SCSI_STATUS))
  			scmd->result = DID_SOFT_ERROR << 16;
  		else if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
  			scmd->result = DID_RESET << 16;
  		else if (!xfer_cnt && scmd->cmnd[0] == REPORT_LUNS) {
  			mpi_reply->SCSIState = MPI2_SCSI_STATE_AUTOSENSE_VALID;
  			mpi_reply->SCSIStatus = SAM_STAT_CHECK_CONDITION;
  			scmd->result = (DRIVER_SENSE << 24) |
  			    SAM_STAT_CHECK_CONDITION;
  			scmd->sense_buffer[0] = 0x70;
  			scmd->sense_buffer[2] = ILLEGAL_REQUEST;
  			scmd->sense_buffer[12] = 0x20;
  			scmd->sense_buffer[13] = 0;
  		}
  		break;
  
  	case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
  		scsi_set_resid(scmd, 0);
  	case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
  	case MPI2_IOCSTATUS_SUCCESS:
  		scmd->result = (DID_OK << 16) | scsi_status;
  		if (response_code ==
  		    MPI2_SCSITASKMGMT_RSP_INVALID_FRAME ||
  		    (scsi_state & (MPI2_SCSI_STATE_AUTOSENSE_FAILED |
  		     MPI2_SCSI_STATE_NO_SCSI_STATUS)))
  			scmd->result = DID_SOFT_ERROR << 16;
  		else if (scsi_state & MPI2_SCSI_STATE_TERMINATED)
  			scmd->result = DID_RESET << 16;
  		break;
  
  	case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
  	case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
  	case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
  		_scsih_eedp_error_handling(scmd, ioc_status);
  		break;
  	case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
  	case MPI2_IOCSTATUS_INVALID_FUNCTION:
  	case MPI2_IOCSTATUS_INVALID_SGL:
  	case MPI2_IOCSTATUS_INTERNAL_ERROR:
  	case MPI2_IOCSTATUS_INVALID_FIELD:
  	case MPI2_IOCSTATUS_INVALID_STATE:
  	case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
  	case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
  	default:
  		scmd->result = DID_SOFT_ERROR << 16;
  		break;
  
  	}
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if (scmd->result && (ioc->logging_level & MPT_DEBUG_REPLY))
  		_scsih_scsi_ioc_info(ioc , scmd, mpi_reply, smid);
  #endif
  
   out:
  	scsi_dma_unmap(scmd);
  	scmd->scsi_done(scmd);
  	return 1;
  }
  
  /**
   * _scsih_sas_host_refresh - refreshing sas host object contents
   * @ioc: per adapter object
   * Context: user
   *
   * During port enable, fw will send topology events for every device. Its
   * possible that the handles may change from the previous setting, so this
   * code keeping handles updating if changed.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_host_refresh(struct MPT2SAS_ADAPTER *ioc)
  {
  	u16 sz;
  	u16 ioc_status;
  	int i;
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
  	u16 attached_handle;
  	u8 link_rate;
  
  	dtmprintk(ioc, printk(MPT2SAS_INFO_FMT
  	    "updating handles for sas_host(0x%016llx)\n",
  	    ioc->name, (unsigned long long)ioc->sas_hba.sas_address));
  
  	sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys
  	    * sizeof(Mpi2SasIOUnit0PhyData_t));
  	sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
  	if (!sas_iounit_pg0) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	if ((mpt2sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
  	    sas_iounit_pg0, sz)) != 0)
  		goto out;
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
  		goto out;
  	for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
  		link_rate = sas_iounit_pg0->PhyData[i].NegotiatedLinkRate >> 4;
  		if (i == 0)
  			ioc->sas_hba.handle = le16_to_cpu(sas_iounit_pg0->
  			    PhyData[0].ControllerDevHandle);
  		ioc->sas_hba.phy[i].handle = ioc->sas_hba.handle;
  		attached_handle = le16_to_cpu(sas_iounit_pg0->PhyData[i].
  		    AttachedDevHandle);
  		if (attached_handle && link_rate < MPI2_SAS_NEG_LINK_RATE_1_5)
  			link_rate = MPI2_SAS_NEG_LINK_RATE_1_5;
  		mpt2sas_transport_update_links(ioc, ioc->sas_hba.sas_address,
  		    attached_handle, i, link_rate);
  	}
   out:
  	kfree(sas_iounit_pg0);
  }
  
  /**
   * _scsih_sas_host_add - create sas host object
   * @ioc: per adapter object
   *
   * Creating host side data object, stored in ioc->sas_hba
   *
   * Return nothing.
   */
  static void
  _scsih_sas_host_add(struct MPT2SAS_ADAPTER *ioc)
  {
  	int i;
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
  	Mpi2SasIOUnitPage1_t *sas_iounit_pg1 = NULL;
  	Mpi2SasPhyPage0_t phy_pg0;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2SasEnclosurePage0_t enclosure_pg0;
  	u16 ioc_status;
  	u16 sz;
  	u16 device_missing_delay;
  
  	mpt2sas_config_get_number_hba_phys(ioc, &ioc->sas_hba.num_phys);
  	if (!ioc->sas_hba.num_phys) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	/* sas_iounit page 0 */
  	sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys *
  	    sizeof(Mpi2SasIOUnit0PhyData_t));
  	sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
  	if (!sas_iounit_pg0) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  	if ((mpt2sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
  	    sas_iounit_pg0, sz))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  
  	/* sas_iounit page 1 */
  	sz = offsetof(Mpi2SasIOUnitPage1_t, PhyData) + (ioc->sas_hba.num_phys *
  	    sizeof(Mpi2SasIOUnit1PhyData_t));
  	sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
  	if (!sas_iounit_pg1) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  	if ((mpt2sas_config_get_sas_iounit_pg1(ioc, &mpi_reply,
  	    sas_iounit_pg1, sz))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  
  	ioc->io_missing_delay =
  	    le16_to_cpu(sas_iounit_pg1->IODeviceMissingDelay);
  	device_missing_delay =
  	    le16_to_cpu(sas_iounit_pg1->ReportDeviceMissingDelay);
  	if (device_missing_delay & MPI2_SASIOUNIT1_REPORT_MISSING_UNIT_16)
  		ioc->device_missing_delay = (device_missing_delay &
  		    MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK) * 16;
  	else
  		ioc->device_missing_delay = device_missing_delay &
  		    MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK;
  
  	ioc->sas_hba.parent_dev = &ioc->shost->shost_gendev;
  	ioc->sas_hba.phy = kcalloc(ioc->sas_hba.num_phys,
  	    sizeof(struct _sas_phy), GFP_KERNEL);
  	if (!ioc->sas_hba.phy) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  	for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
  		if ((mpt2sas_config_get_phy_pg0(ioc, &mpi_reply, &phy_pg0,
  		    i))) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			goto out;
  		}
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			goto out;
  		}
  
  		if (i == 0)
  			ioc->sas_hba.handle = le16_to_cpu(sas_iounit_pg0->
  			    PhyData[0].ControllerDevHandle);
  		ioc->sas_hba.phy[i].handle = ioc->sas_hba.handle;
  		ioc->sas_hba.phy[i].phy_id = i;
  		mpt2sas_transport_add_host_phy(ioc, &ioc->sas_hba.phy[i],
  		    phy_pg0, ioc->sas_hba.parent_dev);
  	}
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, ioc->sas_hba.handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out;
  	}
  	ioc->sas_hba.enclosure_handle =
  	    le16_to_cpu(sas_device_pg0.EnclosureHandle);
  	ioc->sas_hba.sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
  	printk(MPT2SAS_INFO_FMT "host_add: handle(0x%04x), "
  	    "sas_addr(0x%016llx), phys(%d)\n", ioc->name, ioc->sas_hba.handle,
  	    (unsigned long long) ioc->sas_hba.sas_address,
  	    ioc->sas_hba.num_phys) ;
  
  	if (ioc->sas_hba.enclosure_handle) {
  		if (!(mpt2sas_config_get_enclosure_pg0(ioc, &mpi_reply,
  		    &enclosure_pg0,
  		   MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
  		   ioc->sas_hba.enclosure_handle))) {
  			ioc->sas_hba.enclosure_logical_id =
  			    le64_to_cpu(enclosure_pg0.EnclosureLogicalID);
  		}
  	}
  
   out:
  	kfree(sas_iounit_pg1);
  	kfree(sas_iounit_pg0);
  }
  
  /**
   * _scsih_expander_add -  creating expander object
   * @ioc: per adapter object
   * @handle: expander handle
   *
   * Creating expander object, stored in ioc->sas_expander_list.
   *
   * Return 0 for success, else error.
   */
  static int
  _scsih_expander_add(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _sas_node *sas_expander;
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2ExpanderPage0_t expander_pg0;
  	Mpi2ExpanderPage1_t expander_pg1;
  	Mpi2SasEnclosurePage0_t enclosure_pg0;
  	u32 ioc_status;
  	u16 parent_handle;
  	u64 sas_address, sas_address_parent = 0;
  	int i;
  	unsigned long flags;
  	struct _sas_port *mpt2sas_port = NULL;
  	int rc = 0;
  
  	if (!handle)
  		return -1;
  
  	if (ioc->shost_recovery || ioc->pci_error_recovery)
  		return -1;
  
  	if ((mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
  	    MPI2_SAS_EXPAND_PGAD_FORM_HNDL, handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	/* handle out of order topology events */
  	parent_handle = le16_to_cpu(expander_pg0.ParentDevHandle);
  	if (_scsih_get_sas_address(ioc, parent_handle, &sas_address_parent)
  	    != 0) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  	if (sas_address_parent != ioc->sas_hba.sas_address) {
  		spin_lock_irqsave(&ioc->sas_node_lock, flags);
  		sas_expander = mpt2sas_scsih_expander_find_by_sas_address(ioc,
  		    sas_address_parent);
  		spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  		if (!sas_expander) {
  			rc = _scsih_expander_add(ioc, parent_handle);
  			if (rc != 0)
  				return rc;
  		}
  	}
  
  	spin_lock_irqsave(&ioc->sas_node_lock, flags);
  	sas_address = le64_to_cpu(expander_pg0.SASAddress);
  	sas_expander = mpt2sas_scsih_expander_find_by_sas_address(ioc,
  	    sas_address);
  	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  
  	if (sas_expander)
  		return 0;
  
  	sas_expander = kzalloc(sizeof(struct _sas_node),
  	    GFP_KERNEL);
  	if (!sas_expander) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	sas_expander->handle = handle;
  	sas_expander->num_phys = expander_pg0.NumPhys;
  	sas_expander->sas_address_parent = sas_address_parent;
  	sas_expander->sas_address = sas_address;
  
  	printk(MPT2SAS_INFO_FMT "expander_add: handle(0x%04x),"
  	    " parent(0x%04x), sas_addr(0x%016llx), phys(%d)\n", ioc->name,
  	    handle, parent_handle, (unsigned long long)
  	    sas_expander->sas_address, sas_expander->num_phys);
  
  	if (!sas_expander->num_phys)
  		goto out_fail;
  	sas_expander->phy = kcalloc(sas_expander->num_phys,
  	    sizeof(struct _sas_phy), GFP_KERNEL);
  	if (!sas_expander->phy) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		rc = -1;
  		goto out_fail;
  	}
  
  	INIT_LIST_HEAD(&sas_expander->sas_port_list);
  	mpt2sas_port = mpt2sas_transport_port_add(ioc, handle,
  	    sas_address_parent);
  	if (!mpt2sas_port) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		rc = -1;
  		goto out_fail;
  	}
  	sas_expander->parent_dev = &mpt2sas_port->rphy->dev;
  
  	for (i = 0 ; i < sas_expander->num_phys ; i++) {
  		if ((mpt2sas_config_get_expander_pg1(ioc, &mpi_reply,
  		    &expander_pg1, i, handle))) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			rc = -1;
  			goto out_fail;
  		}
  		sas_expander->phy[i].handle = handle;
  		sas_expander->phy[i].phy_id = i;
  
  		if ((mpt2sas_transport_add_expander_phy(ioc,
  		    &sas_expander->phy[i], expander_pg1,
  		    sas_expander->parent_dev))) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			rc = -1;
  			goto out_fail;
  		}
  	}
  
  	if (sas_expander->enclosure_handle) {
  		if (!(mpt2sas_config_get_enclosure_pg0(ioc, &mpi_reply,
  		    &enclosure_pg0, MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
  		   sas_expander->enclosure_handle))) {
  			sas_expander->enclosure_logical_id =
  			    le64_to_cpu(enclosure_pg0.EnclosureLogicalID);
  		}
  	}
  
  	_scsih_expander_node_add(ioc, sas_expander);
  	 return 0;
  
   out_fail:
  
  	if (mpt2sas_port)
  		mpt2sas_transport_port_remove(ioc, sas_expander->sas_address,
  		    sas_address_parent);
  	kfree(sas_expander);
  	return rc;
  }
  
  /**
   * _scsih_done -  scsih callback handler.
   * @ioc: per adapter object
   * @smid: system request message index
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   *
   * Callback handler when sending internal generated message frames.
   * The callback index passed is `ioc->scsih_cb_idx`
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  static u8
  _scsih_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
  {
  	MPI2DefaultReply_t *mpi_reply;
  
  	mpi_reply =  mpt2sas_base_get_reply_virt_addr(ioc, reply);
  	if (ioc->scsih_cmds.status == MPT2_CMD_NOT_USED)
  		return 1;
  	if (ioc->scsih_cmds.smid != smid)
  		return 1;
  	ioc->scsih_cmds.status |= MPT2_CMD_COMPLETE;
  	if (mpi_reply) {
  		memcpy(ioc->scsih_cmds.reply, mpi_reply,
  		    mpi_reply->MsgLength*4);
  		ioc->scsih_cmds.status |= MPT2_CMD_REPLY_VALID;
  	}
  	ioc->scsih_cmds.status &= ~MPT2_CMD_PENDING;
  	complete(&ioc->scsih_cmds.done);
  	return 1;
  }
  
  /**
   * mpt2sas_expander_remove - removing expander object
   * @ioc: per adapter object
   * @sas_address: expander sas_address
   *
   * Return nothing.
   */
  void
  mpt2sas_expander_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address)
  {
  	struct _sas_node *sas_expander;
  	unsigned long flags;
  
  	if (ioc->shost_recovery)
  		return;
  
  	spin_lock_irqsave(&ioc->sas_node_lock, flags);
  	sas_expander = mpt2sas_scsih_expander_find_by_sas_address(ioc,
  	    sas_address);
  	if (!sas_expander) {
  		spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  		return;
  	}
  	list_del(&sas_expander->list);
  	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  	_scsih_expander_node_remove(ioc, sas_expander);
  }
  
  /**
   * _scsih_check_access_status - check access flags
   * @ioc: per adapter object
   * @sas_address: sas address
   * @handle: sas device handle
   * @access_flags: errors returned during discovery of the device
   *
   * Return 0 for success, else failure
   */
  static u8
  _scsih_check_access_status(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
     u16 handle, u8 access_status)
  {
  	u8 rc = 1;
  	char *desc = NULL;
  
  	switch (access_status) {
  	case MPI2_SAS_DEVICE0_ASTATUS_NO_ERRORS:
  	case MPI2_SAS_DEVICE0_ASTATUS_SATA_NEEDS_INITIALIZATION:
  		rc = 0;
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_SATA_CAPABILITY_FAILED:
  		desc = "sata capability failed";
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_SATA_AFFILIATION_CONFLICT:
  		desc = "sata affiliation conflict";
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_ROUTE_NOT_ADDRESSABLE:
  		desc = "route not addressable";
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_SMP_ERROR_NOT_ADDRESSABLE:
  		desc = "smp error not addressable";
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_DEVICE_BLOCKED:
  		desc = "device blocked";
  		break;
  	case MPI2_SAS_DEVICE0_ASTATUS_SATA_INIT_FAILED:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_UNKNOWN:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_AFFILIATION_CONFLICT:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_DIAG:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_IDENTIFICATION:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_CHECK_POWER:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_PIO_SN:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_MDMA_SN:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_UDMA_SN:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_ZONING_VIOLATION:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_NOT_ADDRESSABLE:
  	case MPI2_SAS_DEVICE0_ASTATUS_SIF_MAX:
  		desc = "sata initialization failed";
  		break;
  	default:
  		desc = "unknown";
  		break;
  	}
  
  	if (!rc)
  		return 0;
  
  	printk(MPT2SAS_ERR_FMT "discovery errors(%s): sas_address(0x%016llx), "
  	    "handle(0x%04x)\n", ioc->name, desc,
  	    (unsigned long long)sas_address, handle);
  	return rc;
  }
  
  static void
  _scsih_check_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	struct _sas_device *sas_device;
  	u32 ioc_status;
  	unsigned long flags;
  	u64 sas_address;
  	struct scsi_target *starget;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	u32 device_info;
  
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle)))
  		return;
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
  		return;
  
  	/* check if this is end device */
  	device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
  	if (!(_scsih_is_end_device(device_info)))
  		return;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	    sas_address);
  
  	if (!sas_device) {
  		printk(MPT2SAS_ERR_FMT "device is not present "
  		    "handle(0x%04x), no sas_device!!!\n", ioc->name, handle);
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  		return;
  	}
  
  	if (unlikely(sas_device->handle != handle)) {
  		starget = sas_device->starget;
  		sas_target_priv_data = starget->hostdata;
  		starget_printk(KERN_INFO, starget, "handle changed from(0x%04x)"
  		   " to (0x%04x)!!!\n", sas_device->handle, handle);
  		sas_target_priv_data->handle = handle;
  		sas_device->handle = handle;
  	}
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	/* check if device is present */
  	if (!(le16_to_cpu(sas_device_pg0.Flags) &
  	    MPI2_SAS_DEVICE0_FLAGS_DEVICE_PRESENT)) {
  		printk(MPT2SAS_ERR_FMT "device is not present "
  		    "handle(0x%04x), flags!!!\n", ioc->name, handle);
  		return;
  	}
  
  	/* check if there were any issues with discovery */
  	if (_scsih_check_access_status(ioc, sas_address, handle,
  	    sas_device_pg0.AccessStatus))
  		return;
  	_scsih_ublock_io_device(ioc, handle);
  
  }
  
  /**
   * _scsih_add_device -  creating sas device object
   * @ioc: per adapter object
   * @handle: sas device handle
   * @phy_num: phy number end device attached to
   * @is_pd: is this hidden raid component
   *
   * Creating end device object, stored in ioc->sas_device_list.
   *
   * Returns 0 for success, non-zero for failure.
   */
  static int
  _scsih_add_device(struct MPT2SAS_ADAPTER *ioc, u16 handle, u8 phy_num, u8 is_pd)
  {
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2SasEnclosurePage0_t enclosure_pg0;
  	struct _sas_device *sas_device;
  	u32 ioc_status;
  	__le64 sas_address;
  	u32 device_info;
  	unsigned long flags;
  
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
  
  	/* check if device is present */
  	if (!(le16_to_cpu(sas_device_pg0.Flags) &
  	    MPI2_SAS_DEVICE0_FLAGS_DEVICE_PRESENT)) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		printk(MPT2SAS_ERR_FMT "Flags = 0x%04x\n",
  		    ioc->name, le16_to_cpu(sas_device_pg0.Flags));
  		return -1;
  	}
  
  	/* check if there were any issues with discovery */
  	if (_scsih_check_access_status(ioc, sas_address, handle,
  	    sas_device_pg0.AccessStatus))
  		return -1;
  
  	/* check if this is end device */
  	device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
  	if (!(_scsih_is_end_device(device_info))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	    sas_address);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	if (sas_device)
  		return 0;
  
  	sas_device = kzalloc(sizeof(struct _sas_device),
  	    GFP_KERNEL);
  	if (!sas_device) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return -1;
  	}
  
  	sas_device->handle = handle;
  	if (_scsih_get_sas_address(ioc, le16_to_cpu
  		(sas_device_pg0.ParentDevHandle),
  		&sas_device->sas_address_parent) != 0)
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  	sas_device->enclosure_handle =
  	    le16_to_cpu(sas_device_pg0.EnclosureHandle);
  	sas_device->slot =
  	    le16_to_cpu(sas_device_pg0.Slot);
  	sas_device->device_info = device_info;
  	sas_device->sas_address = sas_address;
  	sas_device->phy = sas_device_pg0.PhyNum;
  
  	/* get enclosure_logical_id */
  	if (sas_device->enclosure_handle && !(mpt2sas_config_get_enclosure_pg0(
  	   ioc, &mpi_reply, &enclosure_pg0, MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
  	   sas_device->enclosure_handle)))
  		sas_device->enclosure_logical_id =
  		    le64_to_cpu(enclosure_pg0.EnclosureLogicalID);
  
  	/* get device name */
  	sas_device->device_name = le64_to_cpu(sas_device_pg0.DeviceName);
  
  	if (ioc->wait_for_discovery_to_complete)
  		_scsih_sas_device_init_add(ioc, sas_device);
  	else
  		_scsih_sas_device_add(ioc, sas_device);
  
  	return 0;
  }
  
  /**
   * _scsih_remove_device -  removing sas device object
   * @ioc: per adapter object
   * @sas_device_delete: the sas_device object
   *
   * Return nothing.
   */
  static void
  _scsih_remove_device(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_device *sas_device)
  {
  	struct _sas_device sas_device_backup;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  
  	if (!sas_device)
  		return;
  
  	memcpy(&sas_device_backup, sas_device, sizeof(struct _sas_device));
  	_scsih_sas_device_remove(ioc, sas_device);
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: enter: "
  	    "handle(0x%04x), sas_addr(0x%016llx)\n", ioc->name, __func__,
  	    sas_device_backup.handle, (unsigned long long)
  	    sas_device_backup.sas_address));
  
  	if (sas_device_backup.starget && sas_device_backup.starget->hostdata) {
  		sas_target_priv_data = sas_device_backup.starget->hostdata;
  		sas_target_priv_data->deleted = 1;
  		_scsih_ublock_io_device(ioc, sas_device_backup.handle);
  		sas_target_priv_data->handle =
  		     MPT2SAS_INVALID_DEVICE_HANDLE;
  	}
  
  	_scsih_ublock_io_device(ioc, sas_device_backup.handle);
  
  	if (!ioc->hide_drives)
  		mpt2sas_transport_port_remove(ioc,
  		    sas_device_backup.sas_address,
  		    sas_device_backup.sas_address_parent);
  
  	printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), sas_addr"
  	    "(0x%016llx)\n", ioc->name, sas_device_backup.handle,
  	    (unsigned long long) sas_device_backup.sas_address);
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: exit: "
  	    "handle(0x%04x), sas_addr(0x%016llx)\n", ioc->name, __func__,
  	    sas_device_backup.handle, (unsigned long long)
  	    sas_device_backup.sas_address));
  }
  
  /**
   * mpt2sas_device_remove - removing device object
   * @ioc: per adapter object
   * @sas_address: expander sas_address
   *
   * Return nothing.
   */
  void
  mpt2sas_device_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address)
  {
  	struct _sas_device *sas_device;
  	unsigned long flags;
  
  	if (ioc->shost_recovery)
  		return;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	    sas_address);
  	if (!sas_device) {
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  		return;
  	}
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	_scsih_remove_device(ioc, sas_device);
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_sas_topology_change_event_debug - debug for topology event
   * @ioc: per adapter object
   * @event_data: event data payload
   * Context: user.
   */
  static void
  _scsih_sas_topology_change_event_debug(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataSasTopologyChangeList_t *event_data)
  {
  	int i;
  	u16 handle;
  	u16 reason_code;
  	u8 phy_number;
  	char *status_str = NULL;
  	u8 link_rate, prev_link_rate;
  
  	switch (event_data->ExpStatus) {
  	case MPI2_EVENT_SAS_TOPO_ES_ADDED:
  		status_str = "add";
  		break;
  	case MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING:
  		status_str = "remove";
  		break;
  	case MPI2_EVENT_SAS_TOPO_ES_RESPONDING:
  	case 0:
  		status_str =  "responding";
  		break;
  	case MPI2_EVENT_SAS_TOPO_ES_DELAY_NOT_RESPONDING:
  		status_str = "remove delay";
  		break;
  	default:
  		status_str = "unknown status";
  		break;
  	}
  	printk(MPT2SAS_INFO_FMT "sas topology change: (%s)\n",
  	    ioc->name, status_str);
  	printk(KERN_INFO "\thandle(0x%04x), enclosure_handle(0x%04x) "
  	    "start_phy(%02d), count(%d)\n",
  	    le16_to_cpu(event_data->ExpanderDevHandle),
  	    le16_to_cpu(event_data->EnclosureHandle),
  	    event_data->StartPhyNum, event_data->NumEntries);
  	for (i = 0; i < event_data->NumEntries; i++) {
  		handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
  		if (!handle)
  			continue;
  		phy_number = event_data->StartPhyNum + i;
  		reason_code = event_data->PHY[i].PhyStatus &
  		    MPI2_EVENT_SAS_TOPO_RC_MASK;
  		switch (reason_code) {
  		case MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED:
  			status_str = "target add";
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING:
  			status_str = "target remove";
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING:
  			status_str = "delay target remove";
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED:
  			status_str = "link rate change";
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_NO_CHANGE:
  			status_str = "target responding";
  			break;
  		default:
  			status_str = "unknown";
  			break;
  		}
  		link_rate = event_data->PHY[i].LinkRate >> 4;
  		prev_link_rate = event_data->PHY[i].LinkRate & 0xF;
  		printk(KERN_INFO "\tphy(%02d), attached_handle(0x%04x): %s:"
  		    " link rate: new(0x%02x), old(0x%02x)\n", phy_number,
  		    handle, status_str, link_rate, prev_link_rate);
  
  	}
  }
  #endif
  
  /**
   * _scsih_sas_topology_change_event - handle topology changes
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   */
  static void
  _scsih_sas_topology_change_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	int i;
  	u16 parent_handle, handle;
  	u16 reason_code;
  	u8 phy_number, max_phys;
  	struct _sas_node *sas_expander;
  	struct _sas_device *sas_device;
  	u64 sas_address;
  	unsigned long flags;
  	u8 link_rate, prev_link_rate;
  	Mpi2EventDataSasTopologyChangeList_t *event_data = fw_event->event_data;
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
  		_scsih_sas_topology_change_event_debug(ioc, event_data);
  #endif
  
  	if (ioc->remove_host || ioc->pci_error_recovery)
  		return;
  
  	if (!ioc->sas_hba.num_phys)
  		_scsih_sas_host_add(ioc);
  	else
  		_scsih_sas_host_refresh(ioc);
  
  	if (fw_event->ignore) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "ignoring expander "
  		    "event\n", ioc->name));
  		return;
  	}
  
  	parent_handle = le16_to_cpu(event_data->ExpanderDevHandle);
  
  	/* handle expander add */
  	if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_ADDED)
  		if (_scsih_expander_add(ioc, parent_handle) != 0)
  			return;
  
  	spin_lock_irqsave(&ioc->sas_node_lock, flags);
  	sas_expander = mpt2sas_scsih_expander_find_by_handle(ioc,
  	    parent_handle);
  	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  	if (sas_expander) {
  		sas_address = sas_expander->sas_address;
  		max_phys = sas_expander->num_phys;
  	} else if (parent_handle < ioc->sas_hba.num_phys) {
  		sas_address = ioc->sas_hba.sas_address;
  		max_phys = ioc->sas_hba.num_phys;
  	} else
  		return;
  
  	/* handle siblings events */
  	for (i = 0; i < event_data->NumEntries; i++) {
  		if (fw_event->ignore) {
  			dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "ignoring "
  			    "expander event\n", ioc->name));
  			return;
  		}
  		if (ioc->shost_recovery || ioc->remove_host ||
  		    ioc->pci_error_recovery)
  			return;
  		phy_number = event_data->StartPhyNum + i;
  		if (phy_number >= max_phys)
  			continue;
  		reason_code = event_data->PHY[i].PhyStatus &
  		    MPI2_EVENT_SAS_TOPO_RC_MASK;
  		if ((event_data->PHY[i].PhyStatus &
  		    MPI2_EVENT_SAS_TOPO_PHYSTATUS_VACANT) && (reason_code !=
  		    MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING))
  			continue;
  		handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
  		if (!handle)
  			continue;
  		link_rate = event_data->PHY[i].LinkRate >> 4;
  		prev_link_rate = event_data->PHY[i].LinkRate & 0xF;
  		switch (reason_code) {
  		case MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED:
  
  			if (ioc->shost_recovery)
  				break;
  
  			if (link_rate == prev_link_rate)
  				break;
  
  			mpt2sas_transport_update_links(ioc, sas_address,
  			    handle, phy_number, link_rate);
  
  			if (link_rate < MPI2_SAS_NEG_LINK_RATE_1_5)
  				break;
  
  			_scsih_check_device(ioc, handle);
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED:
  
  			if (ioc->shost_recovery)
  				break;
  
  			mpt2sas_transport_update_links(ioc, sas_address,
  			    handle, phy_number, link_rate);
  
  			_scsih_add_device(ioc, handle, phy_number, 0);
  			break;
  		case MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING:
  
  			spin_lock_irqsave(&ioc->sas_device_lock, flags);
  			sas_device = _scsih_sas_device_find_by_handle(ioc,
  			    handle);
  			if (!sas_device) {
  				spin_unlock_irqrestore(&ioc->sas_device_lock,
  				    flags);
  				break;
  			}
  			spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  			_scsih_remove_device(ioc, sas_device);
  			break;
  		}
  	}
  
  	/* handle expander removal */
  	if (event_data->ExpStatus == MPI2_EVENT_SAS_TOPO_ES_NOT_RESPONDING &&
  	    sas_expander)
  		mpt2sas_expander_remove(ioc, sas_address);
  
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_sas_device_status_change_event_debug - debug for device event
   * @event_data: event data payload
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_device_status_change_event_debug(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataSasDeviceStatusChange_t *event_data)
  {
  	char *reason_str = NULL;
  
  	switch (event_data->ReasonCode) {
  	case MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA:
  		reason_str = "smart data";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_UNSUPPORTED:
  		reason_str = "unsupported device discovered";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET:
  		reason_str = "internal device reset";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_TASK_ABORT_INTERNAL:
  		reason_str = "internal task abort";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_ABORT_TASK_SET_INTERNAL:
  		reason_str = "internal task abort set";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_CLEAR_TASK_SET_INTERNAL:
  		reason_str = "internal clear task set";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_QUERY_TASK_INTERNAL:
  		reason_str = "internal query task";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_SATA_INIT_FAILURE:
  		reason_str = "sata init failure";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_INTERNAL_DEV_RESET:
  		reason_str = "internal device reset complete";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_TASK_ABORT_INTERNAL:
  		reason_str = "internal task abort complete";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_ASYNC_NOTIFICATION:
  		reason_str = "internal async notification";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_EXPANDER_REDUCED_FUNCTIONALITY:
  		reason_str = "expander reduced functionality";
  		break;
  	case MPI2_EVENT_SAS_DEV_STAT_RC_CMP_EXPANDER_REDUCED_FUNCTIONALITY:
  		reason_str = "expander reduced functionality complete";
  		break;
  	default:
  		reason_str = "unknown reason";
  		break;
  	}
  	printk(MPT2SAS_INFO_FMT "device status change: (%s)\n"
  	    "\thandle(0x%04x), sas address(0x%016llx), tag(%d)",
  	    ioc->name, reason_str, le16_to_cpu(event_data->DevHandle),
  	    (unsigned long long)le64_to_cpu(event_data->SASAddress),
  	    le16_to_cpu(event_data->TaskTag));
  	if (event_data->ReasonCode == MPI2_EVENT_SAS_DEV_STAT_RC_SMART_DATA)
  		printk(MPT2SAS_INFO_FMT ", ASC(0x%x), ASCQ(0x%x)\n", ioc->name,
  		    event_data->ASC, event_data->ASCQ);
  	printk(KERN_INFO "\n");
  }
  #endif
  
  /**
   * _scsih_sas_device_status_change_event - handle device status change
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_device_status_change_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	struct MPT2SAS_TARGET *target_priv_data;
  	struct _sas_device *sas_device;
  	u64 sas_address;
  	unsigned long flags;
  	Mpi2EventDataSasDeviceStatusChange_t *event_data =
  	    fw_event->event_data;
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
  		_scsih_sas_device_status_change_event_debug(ioc,
  		     event_data);
  #endif
  
  	/* In MPI Revision K (0xC), the internal device reset complete was
  	 * implemented, so avoid setting tm_busy flag for older firmware.
  	 */
  	if ((ioc->facts.HeaderVersion >> 8) < 0xC)
  		return;
  
  	if (event_data->ReasonCode !=
  	    MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET &&
  	   event_data->ReasonCode !=
  	    MPI2_EVENT_SAS_DEV_STAT_RC_CMP_INTERNAL_DEV_RESET)
  		return;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_address = le64_to_cpu(event_data->SASAddress);
  	sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  	    sas_address);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  	if (!sas_device || !sas_device->starget)
  		return;
  
  	target_priv_data = sas_device->starget->hostdata;
  	if (!target_priv_data)
  		return;
  
  	if (event_data->ReasonCode ==
  	    MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET)
  		target_priv_data->tm_busy = 1;
  	else
  		target_priv_data->tm_busy = 0;
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_sas_enclosure_dev_status_change_event_debug - debug for enclosure event
   * @ioc: per adapter object
   * @event_data: event data payload
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_enclosure_dev_status_change_event_debug(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataSasEnclDevStatusChange_t *event_data)
  {
  	char *reason_str = NULL;
  
  	switch (event_data->ReasonCode) {
  	case MPI2_EVENT_SAS_ENCL_RC_ADDED:
  		reason_str = "enclosure add";
  		break;
  	case MPI2_EVENT_SAS_ENCL_RC_NOT_RESPONDING:
  		reason_str = "enclosure remove";
  		break;
  	default:
  		reason_str = "unknown reason";
  		break;
  	}
  
  	printk(MPT2SAS_INFO_FMT "enclosure status change: (%s)\n"
  	    "\thandle(0x%04x), enclosure logical id(0x%016llx)"
  	    " number slots(%d)\n", ioc->name, reason_str,
  	    le16_to_cpu(event_data->EnclosureHandle),
  	    (unsigned long long)le64_to_cpu(event_data->EnclosureLogicalID),
  	    le16_to_cpu(event_data->StartSlot));
  }
  #endif
  
  /**
   * _scsih_sas_enclosure_dev_status_change_event - handle enclosure events
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_enclosure_dev_status_change_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
  		_scsih_sas_enclosure_dev_status_change_event_debug(ioc,
  		     fw_event->event_data);
  #endif
  }
  
  /**
   * _scsih_sas_broadcast_primitive_event - handle broadcast events
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_broadcast_primitive_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	struct scsi_cmnd *scmd;
  	struct scsi_device *sdev;
  	u16 smid, handle;
  	u32 lun;
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	u32 termination_count;
  	u32 query_count;
  	Mpi2SCSITaskManagementReply_t *mpi_reply;
  	Mpi2EventDataSasBroadcastPrimitive_t *event_data = fw_event->event_data;
  	u16 ioc_status;
  	unsigned long flags;
  	int r;
  	u8 max_retries = 0;
  	u8 task_abort_retries;
  
  	mutex_lock(&ioc->tm_cmds.mutex);
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: enter: phy number(%d), "
  	    "width(%d)\n", ioc->name, __func__, event_data->PhyNum,
  	     event_data->PortWidth));
  
  	_scsih_block_io_all_device(ioc);
  
  	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	mpi_reply = ioc->tm_cmds.reply;
  broadcast_aen_retry:
  
  	/* sanity checks for retrying this loop */
  	if (max_retries++ == 5) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: giving up\n",
  		    ioc->name, __func__));
  		goto out;
  	} else if (max_retries > 1)
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: %d retry\n",
  		    ioc->name, __func__, max_retries - 1));
  
  	termination_count = 0;
  	query_count = 0;
  	for (smid = 1; smid <= ioc->scsiio_depth; smid++) {
  		if (ioc->shost_recovery)
  			goto out;
  		scmd = _scsih_scsi_lookup_get(ioc, smid);
  		if (!scmd)
  			continue;
  		sdev = scmd->device;
  		sas_device_priv_data = sdev->hostdata;
  		if (!sas_device_priv_data || !sas_device_priv_data->sas_target)
  			continue;
  		 /* skip hidden raid components */
  		if (sas_device_priv_data->sas_target->flags &
  		    MPT_TARGET_FLAGS_RAID_COMPONENT)
  			continue;
  		 /* skip volumes */
  		if (sas_device_priv_data->sas_target->flags &
  		    MPT_TARGET_FLAGS_VOLUME)
  			continue;
  
  		handle = sas_device_priv_data->sas_target->handle;
  		lun = sas_device_priv_data->lun;
  		query_count++;
  
  		if (ioc->shost_recovery)
  			goto out;
  
  		spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
  		r = mpt2sas_scsih_issue_tm(ioc, handle, 0, 0, lun,
  		    MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK, smid, 30, 0,
  		    TM_MUTEX_OFF);
  		if (r == FAILED) {
  			sdev_printk(KERN_WARNING, sdev,
  			    "mpt2sas_scsih_issue_tm: FAILED when sending "
  			    "QUERY_TASK: scmd(%p)\n", scmd);
  			spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  			goto broadcast_aen_retry;
  		}
  		ioc_status = le16_to_cpu(mpi_reply->IOCStatus)
  		    & MPI2_IOCSTATUS_MASK;
  		if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  			sdev_printk(KERN_WARNING, sdev, "query task: FAILED "
  			    "with IOCSTATUS(0x%04x), scmd(%p)\n", ioc_status,
  			    scmd);
  			spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  			goto broadcast_aen_retry;
  		}
  
  		/* see if IO is still owned by IOC and target */
  		if (mpi_reply->ResponseCode ==
  		     MPI2_SCSITASKMGMT_RSP_TM_SUCCEEDED ||
  		     mpi_reply->ResponseCode ==
  		     MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC) {
  			spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  			continue;
  		}
  		task_abort_retries = 0;
   tm_retry:
  		if (task_abort_retries++ == 60) {
  			dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  			    "%s: ABORT_TASK: giving up\n", ioc->name,
  			    __func__));
  			spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  			goto broadcast_aen_retry;
  		}
  
  		if (ioc->shost_recovery)
  			goto out_no_lock;
  
  		r = mpt2sas_scsih_issue_tm(ioc, handle, sdev->channel, sdev->id,
  		    sdev->lun, MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK, smid, 30,
  		    scmd->serial_number, TM_MUTEX_OFF);
  		if (r == FAILED) {
  			sdev_printk(KERN_WARNING, sdev,
  			    "mpt2sas_scsih_issue_tm: ABORT_TASK: FAILED : "
  			    "scmd(%p)\n", scmd);
  			goto tm_retry;
  		}
  
  		if (task_abort_retries > 1)
  			sdev_printk(KERN_WARNING, sdev,
  			    "mpt2sas_scsih_issue_tm: ABORT_TASK: RETRIES (%d):"
  			    " scmd(%p)\n",
  			    task_abort_retries - 1, scmd);
  
  		termination_count += le32_to_cpu(mpi_reply->TerminationCount);
  		spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
  	}
  
  	if (ioc->broadcast_aen_pending) {
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: loop back due to"
  		     " pending AEN\n", ioc->name, __func__));
  		 ioc->broadcast_aen_pending = 0;
  		 goto broadcast_aen_retry;
  	}
  
   out:
  	spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
   out_no_lock:
  
  	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
  	    "%s - exit, query_count = %d termination_count = %d\n",
  	    ioc->name, __func__, query_count, termination_count));
  
  	ioc->broadcast_aen_busy = 0;
  	if (!ioc->shost_recovery)
  		_scsih_ublock_io_all_device(ioc);
  	mutex_unlock(&ioc->tm_cmds.mutex);
  }
  
  /**
   * _scsih_sas_discovery_event - handle discovery events
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_discovery_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	Mpi2EventDataSasDiscovery_t *event_data = fw_event->event_data;
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK) {
  		printk(MPT2SAS_INFO_FMT "discovery event: (%s)", ioc->name,
  		    (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED) ?
  		    "start" : "stop");
  	if (event_data->DiscoveryStatus)
  		printk("discovery_status(0x%08x)",
  		    le32_to_cpu(event_data->DiscoveryStatus));
  	printk("\n");
  	}
  #endif
  
  	if (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED &&
  	    !ioc->sas_hba.num_phys)
  		_scsih_sas_host_add(ioc);
  }
  
  /**
   * _scsih_reprobe_lun - reprobing lun
   * @sdev: scsi device struct
   * @no_uld_attach: sdev->no_uld_attach flag setting
   *
   **/
  static void
  _scsih_reprobe_lun(struct scsi_device *sdev, void *no_uld_attach)
  {
  	int rc;
  
  	sdev->no_uld_attach = no_uld_attach ? 1 : 0;
  	sdev_printk(KERN_INFO, sdev, "%s raid component\n",
  	    sdev->no_uld_attach ? "hidding" : "exposing");
  	rc = scsi_device_reprobe(sdev);
  }
  
  /**
   * _scsih_reprobe_target - reprobing target
   * @starget: scsi target struct
   * @no_uld_attach: sdev->no_uld_attach flag setting
   *
   * Note: no_uld_attach flag determines whether the disk device is attached
   * to block layer. A value of `1` means to not attach.
   **/
  static void
  _scsih_reprobe_target(struct scsi_target *starget, int no_uld_attach)
  {
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  
  	if (starget == NULL)
  		return;
  	sas_target_priv_data = starget->hostdata;
  	if (no_uld_attach)
  		sas_target_priv_data->flags |= MPT_TARGET_FLAGS_RAID_COMPONENT;
  	else
  		sas_target_priv_data->flags &= ~MPT_TARGET_FLAGS_RAID_COMPONENT;
  
  	starget_for_each_device(starget, no_uld_attach ? (void *)1 : NULL,
  	    _scsih_reprobe_lun);
  }
  /**
   * _scsih_sas_volume_add - add new volume
   * @ioc: per adapter object
   * @element: IR config element data
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_volume_add(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventIrConfigElement_t *element)
  {
  	struct _raid_device *raid_device;
  	unsigned long flags;
  	u64 wwid;
  	u16 handle = le16_to_cpu(element->VolDevHandle);
  	int rc;
  
  	mpt2sas_config_get_volume_wwid(ioc, handle, &wwid);
  	if (!wwid) {
  		printk(MPT2SAS_ERR_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name,
  		    __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	raid_device = _scsih_raid_device_find_by_wwid(ioc, wwid);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  
  	if (raid_device)
  		return;
  
  	raid_device = kzalloc(sizeof(struct _raid_device), GFP_KERNEL);
  	if (!raid_device) {
  		printk(MPT2SAS_ERR_FMT
  		    "failure at %s:%d/%s()!\n", ioc->name,
  		    __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	raid_device->id = ioc->sas_id++;
  	raid_device->channel = RAID_CHANNEL;
  	raid_device->handle = handle;
  	raid_device->wwid = wwid;
  	_scsih_raid_device_add(ioc, raid_device);
  	if (!ioc->wait_for_discovery_to_complete) {
  		rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
  		    raid_device->id, 0);
  		if (rc)
  			_scsih_raid_device_remove(ioc, raid_device);
  	} else
  		_scsih_determine_boot_device(ioc, raid_device, 1);
  }
  
  /**
   * _scsih_sas_volume_delete - delete volume
   * @ioc: per adapter object
   * @handle: volume device handle
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_volume_delete(struct MPT2SAS_ADAPTER *ioc, u16 handle)
  {
  	struct _raid_device *raid_device;
  	unsigned long flags;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  	if (!raid_device)
  		return;
  	if (raid_device->starget) {
  		sas_target_priv_data = raid_device->starget->hostdata;
  		sas_target_priv_data->deleted = 1;
  		scsi_remove_target(&raid_device->starget->dev);
  	}
  	printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), wwid"
  	    "(0x%016llx)\n", ioc->name,  raid_device->handle,
  	    (unsigned long long) raid_device->wwid);
  	_scsih_raid_device_remove(ioc, raid_device);
  }
  
  /**
   * _scsih_sas_pd_expose - expose pd component to /dev/sdX
   * @ioc: per adapter object
   * @element: IR config element data
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_pd_expose(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventIrConfigElement_t *element)
  {
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (!sas_device)
  		return;
  
  	/* exposing raid component */
  	sas_device->volume_handle = 0;
  	sas_device->volume_wwid = 0;
  	clear_bit(handle, ioc->pd_handles);
  	_scsih_reprobe_target(sas_device->starget, 0);
  }
  
  /**
   * _scsih_sas_pd_hide - hide pd component from /dev/sdX
   * @ioc: per adapter object
   * @element: IR config element data
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_pd_hide(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventIrConfigElement_t *element)
  {
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (!sas_device)
  		return;
  
  	/* hiding raid component */
  	mpt2sas_config_get_volume_handle(ioc, handle,
  	    &sas_device->volume_handle);
  	mpt2sas_config_get_volume_wwid(ioc, sas_device->volume_handle,
  	    &sas_device->volume_wwid);
  	set_bit(handle, ioc->pd_handles);
  	_scsih_reprobe_target(sas_device->starget, 1);
  
  }
  
  /**
   * _scsih_sas_pd_delete - delete pd component
   * @ioc: per adapter object
   * @element: IR config element data
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_pd_delete(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventIrConfigElement_t *element)
  {
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (!sas_device)
  		return;
  	_scsih_remove_device(ioc, sas_device);
  }
  
  /**
   * _scsih_sas_pd_add - remove pd component
   * @ioc: per adapter object
   * @element: IR config element data
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_pd_add(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventIrConfigElement_t *element)
  {
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	u16 handle = le16_to_cpu(element->PhysDiskDevHandle);
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	u32 ioc_status;
  	u64 sas_address;
  	u16 parent_handle;
  
  	set_bit(handle, ioc->pd_handles);
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	if (sas_device)
  		return;
  
  	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
  	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  	    MPI2_IOCSTATUS_MASK;
  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return;
  	}
  
  	parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
  	if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address))
  		mpt2sas_transport_update_links(ioc, sas_address, handle,
  		    sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
  
  	_scsih_add_device(ioc, handle, 0, 1);
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_sas_ir_config_change_event_debug - debug for IR Config Change events
   * @ioc: per adapter object
   * @event_data: event data payload
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_config_change_event_debug(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataIrConfigChangeList_t *event_data)
  {
  	Mpi2EventIrConfigElement_t *element;
  	u8 element_type;
  	int i;
  	char *reason_str = NULL, *element_str = NULL;
  
  	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
  
  	printk(MPT2SAS_INFO_FMT "raid config change: (%s), elements(%d)\n",
  	    ioc->name, (le32_to_cpu(event_data->Flags) &
  	    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG) ?
  	    "foreign" : "native", event_data->NumElements);
  	for (i = 0; i < event_data->NumElements; i++, element++) {
  		switch (element->ReasonCode) {
  		case MPI2_EVENT_IR_CHANGE_RC_ADDED:
  			reason_str = "add";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_REMOVED:
  			reason_str = "remove";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_NO_CHANGE:
  			reason_str = "no change";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_HIDE:
  			reason_str = "hide";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_UNHIDE:
  			reason_str = "unhide";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED:
  			reason_str = "volume_created";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED:
  			reason_str = "volume_deleted";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
  			reason_str = "pd_created";
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_PD_DELETED:
  			reason_str = "pd_deleted";
  			break;
  		default:
  			reason_str = "unknown reason";
  			break;
  		}
  		element_type = le16_to_cpu(element->ElementFlags) &
  		    MPI2_EVENT_IR_CHANGE_EFLAGS_ELEMENT_TYPE_MASK;
  		switch (element_type) {
  		case MPI2_EVENT_IR_CHANGE_EFLAGS_VOLUME_ELEMENT:
  			element_str = "volume";
  			break;
  		case MPI2_EVENT_IR_CHANGE_EFLAGS_VOLPHYSDISK_ELEMENT:
  			element_str = "phys disk";
  			break;
  		case MPI2_EVENT_IR_CHANGE_EFLAGS_HOTSPARE_ELEMENT:
  			element_str = "hot spare";
  			break;
  		default:
  			element_str = "unknown element";
  			break;
  		}
  		printk(KERN_INFO "\t(%s:%s), vol handle(0x%04x), "
  		    "pd handle(0x%04x), pd num(0x%02x)\n", element_str,
  		    reason_str, le16_to_cpu(element->VolDevHandle),
  		    le16_to_cpu(element->PhysDiskDevHandle),
  		    element->PhysDiskNum);
  	}
  }
  #endif
  
  /**
   * _scsih_sas_ir_config_change_event - handle ir configuration change events
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_config_change_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	Mpi2EventIrConfigElement_t *element;
  	int i;
  	u8 foreign_config;
  	Mpi2EventDataIrConfigChangeList_t *event_data = fw_event->event_data;
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
  	    && !ioc->hide_ir_msg)
  		_scsih_sas_ir_config_change_event_debug(ioc, event_data);
  
  #endif
  
  	if (ioc->shost_recovery)
  		return;
  
  	foreign_config = (le32_to_cpu(event_data->Flags) &
  	    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG) ? 1 : 0;
  
  	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
  	for (i = 0; i < event_data->NumElements; i++, element++) {
  
  		switch (element->ReasonCode) {
  		case MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED:
  		case MPI2_EVENT_IR_CHANGE_RC_ADDED:
  			if (!foreign_config)
  				_scsih_sas_volume_add(ioc, element);
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED:
  		case MPI2_EVENT_IR_CHANGE_RC_REMOVED:
  			if (!foreign_config)
  				_scsih_sas_volume_delete(ioc,
  				    le16_to_cpu(element->VolDevHandle));
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
  			if (!ioc->is_warpdrive)
  				_scsih_sas_pd_hide(ioc, element);
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_PD_DELETED:
  			if (!ioc->is_warpdrive)
  				_scsih_sas_pd_expose(ioc, element);
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_HIDE:
  			if (!ioc->is_warpdrive)
  				_scsih_sas_pd_add(ioc, element);
  			break;
  		case MPI2_EVENT_IR_CHANGE_RC_UNHIDE:
  			if (!ioc->is_warpdrive)
  				_scsih_sas_pd_delete(ioc, element);
  			break;
  		}
  	}
  }
  
  /**
   * _scsih_sas_ir_volume_event - IR volume event
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_volume_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	u64 wwid;
  	unsigned long flags;
  	struct _raid_device *raid_device;
  	u16 handle;
  	u32 state;
  	int rc;
  	Mpi2EventDataIrVolume_t *event_data = fw_event->event_data;
  
  	if (ioc->shost_recovery)
  		return;
  
  	if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
  		return;
  
  	handle = le16_to_cpu(event_data->VolDevHandle);
  	state = le32_to_cpu(event_data->NewValue);
  	if (!ioc->hide_ir_msg)
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
  		    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
  		    le32_to_cpu(event_data->PreviousValue), state));
  
  	switch (state) {
  	case MPI2_RAID_VOL_STATE_MISSING:
  	case MPI2_RAID_VOL_STATE_FAILED:
  		_scsih_sas_volume_delete(ioc, handle);
  		break;
  
  	case MPI2_RAID_VOL_STATE_ONLINE:
  	case MPI2_RAID_VOL_STATE_DEGRADED:
  	case MPI2_RAID_VOL_STATE_OPTIMAL:
  
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  
  		if (raid_device)
  			break;
  
  		mpt2sas_config_get_volume_wwid(ioc, handle, &wwid);
  		if (!wwid) {
  			printk(MPT2SAS_ERR_FMT
  			    "failure at %s:%d/%s()!\n", ioc->name,
  			    __FILE__, __LINE__, __func__);
  			break;
  		}
  
  		raid_device = kzalloc(sizeof(struct _raid_device), GFP_KERNEL);
  		if (!raid_device) {
  			printk(MPT2SAS_ERR_FMT
  			    "failure at %s:%d/%s()!\n", ioc->name,
  			    __FILE__, __LINE__, __func__);
  			break;
  		}
  
  		raid_device->id = ioc->sas_id++;
  		raid_device->channel = RAID_CHANNEL;
  		raid_device->handle = handle;
  		raid_device->wwid = wwid;
  		_scsih_raid_device_add(ioc, raid_device);
  		rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
  		    raid_device->id, 0);
  		if (rc)
  			_scsih_raid_device_remove(ioc, raid_device);
  		break;
  
  	case MPI2_RAID_VOL_STATE_INITIALIZING:
  	default:
  		break;
  	}
  }
  
  /**
   * _scsih_sas_ir_physical_disk_event - PD event
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	u16 handle, parent_handle;
  	u32 state;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  	Mpi2ConfigReply_t mpi_reply;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	u32 ioc_status;
  	Mpi2EventDataIrPhysicalDisk_t *event_data = fw_event->event_data;
  	u64 sas_address;
  
  	if (ioc->shost_recovery)
  		return;
  
  	if (event_data->ReasonCode != MPI2_EVENT_IR_PHYSDISK_RC_STATE_CHANGED)
  		return;
  
  	handle = le16_to_cpu(event_data->PhysDiskDevHandle);
  	state = le32_to_cpu(event_data->NewValue);
  
  	if (!ioc->hide_ir_msg)
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
  		    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
  		    le32_to_cpu(event_data->PreviousValue), state));
  
  	switch (state) {
  	case MPI2_RAID_PD_STATE_ONLINE:
  	case MPI2_RAID_PD_STATE_DEGRADED:
  	case MPI2_RAID_PD_STATE_REBUILDING:
  	case MPI2_RAID_PD_STATE_OPTIMAL:
  	case MPI2_RAID_PD_STATE_HOT_SPARE:
  
  		if (!ioc->is_warpdrive)
  			set_bit(handle, ioc->pd_handles);
  
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  		if (sas_device)
  			return;
  
  		if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
  		    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
  		    handle))) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			return;
  		}
  
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			return;
  		}
  
  		parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
  		if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address))
  			mpt2sas_transport_update_links(ioc, sas_address, handle,
  			    sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
  
  		_scsih_add_device(ioc, handle, 0, 1);
  
  		break;
  
  	case MPI2_RAID_PD_STATE_OFFLINE:
  	case MPI2_RAID_PD_STATE_NOT_CONFIGURED:
  	case MPI2_RAID_PD_STATE_NOT_COMPATIBLE:
  	default:
  		break;
  	}
  }
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  /**
   * _scsih_sas_ir_operation_status_event_debug - debug for IR op event
   * @ioc: per adapter object
   * @event_data: event data payload
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_operation_status_event_debug(struct MPT2SAS_ADAPTER *ioc,
      Mpi2EventDataIrOperationStatus_t *event_data)
  {
  	char *reason_str = NULL;
  
  	switch (event_data->RAIDOperation) {
  	case MPI2_EVENT_IR_RAIDOP_RESYNC:
  		reason_str = "resync";
  		break;
  	case MPI2_EVENT_IR_RAIDOP_ONLINE_CAP_EXPANSION:
  		reason_str = "online capacity expansion";
  		break;
  	case MPI2_EVENT_IR_RAIDOP_CONSISTENCY_CHECK:
  		reason_str = "consistency check";
  		break;
  	case MPI2_EVENT_IR_RAIDOP_BACKGROUND_INIT:
  		reason_str = "background init";
  		break;
  	case MPI2_EVENT_IR_RAIDOP_MAKE_DATA_CONSISTENT:
  		reason_str = "make data consistent";
  		break;
  	}
  
  	if (!reason_str)
  		return;
  
  	printk(MPT2SAS_INFO_FMT "raid operational status: (%s)"
  	    "\thandle(0x%04x), percent complete(%d)\n",
  	    ioc->name, reason_str,
  	    le16_to_cpu(event_data->VolDevHandle),
  	    event_data->PercentComplete);
  }
  #endif
  
  /**
   * _scsih_sas_ir_operation_status_event - handle RAID operation events
   * @ioc: per adapter object
   * @fw_event: The fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _scsih_sas_ir_operation_status_event(struct MPT2SAS_ADAPTER *ioc,
      struct fw_event_work *fw_event)
  {
  	Mpi2EventDataIrOperationStatus_t *event_data = fw_event->event_data;
  	static struct _raid_device *raid_device;
  	unsigned long flags;
  	u16 handle;
  
  #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
  	if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
  	    && !ioc->hide_ir_msg)
  		_scsih_sas_ir_operation_status_event_debug(ioc,
  		     event_data);
  #endif
  
  	/* code added for raid transport support */
  	if (event_data->RAIDOperation == MPI2_EVENT_IR_RAIDOP_RESYNC) {
  
  		handle = le16_to_cpu(event_data->VolDevHandle);
  
  		spin_lock_irqsave(&ioc->raid_device_lock, flags);
  		raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
  		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  
  		if (!raid_device)
  			return;
  
  		if (event_data->RAIDOperation == MPI2_EVENT_IR_RAIDOP_RESYNC)
  			raid_device->percent_complete =
  			    event_data->PercentComplete;
  	}
  }
  
  /**
   * _scsih_prep_device_scan - initialize parameters prior to device scan
   * @ioc: per adapter object
   *
   * Set the deleted flag prior to device scan.  If the device is found during
   * the scan, then we clear the deleted flag.
   */
  static void
  _scsih_prep_device_scan(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct MPT2SAS_DEVICE *sas_device_priv_data;
  	struct scsi_device *sdev;
  
  	shost_for_each_device(sdev, ioc->shost) {
  		sas_device_priv_data = sdev->hostdata;
  		if (sas_device_priv_data && sas_device_priv_data->sas_target)
  			sas_device_priv_data->sas_target->deleted = 1;
  	}
  }
  
  /**
   * _scsih_mark_responding_sas_device - mark a sas_devices as responding
   * @ioc: per adapter object
   * @sas_address: sas address
   * @slot: enclosure slot id
   * @handle: device handle
   *
   * After host reset, find out whether devices are still responding.
   * Used in _scsi_remove_unresponsive_sas_devices.
   *
   * Return nothing.
   */
  static void
  _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
      u16 slot, u16 handle)
  {
  	struct MPT2SAS_TARGET *sas_target_priv_data = NULL;
  	struct scsi_target *starget;
  	struct _sas_device *sas_device;
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->sas_device_lock, flags);
  	list_for_each_entry(sas_device, &ioc->sas_device_list, list) {
  		if (sas_device->sas_address == sas_address &&
  		    sas_device->slot == slot) {
  			sas_device->responding = 1;
  			starget = sas_device->starget;
  			if (starget && starget->hostdata) {
  				sas_target_priv_data = starget->hostdata;
  				sas_target_priv_data->tm_busy = 0;
  				sas_target_priv_data->deleted = 0;
  			} else
  				sas_target_priv_data = NULL;
  			if (starget)
  				starget_printk(KERN_INFO, starget,
  				    "handle(0x%04x), sas_addr(0x%016llx), "
  				    "enclosure logical id(0x%016llx), "
  				    "slot(%d)\n", handle,
  				    (unsigned long long)sas_device->sas_address,
  				    (unsigned long long)
  				    sas_device->enclosure_logical_id,
  				    sas_device->slot);
  			if (sas_device->handle == handle)
  				goto out;
  			printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
  			    sas_device->handle);
  			sas_device->handle = handle;
  			if (sas_target_priv_data)
  				sas_target_priv_data->handle = handle;
  			goto out;
  		}
  	}
   out:
  	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  }
  
  /**
   * _scsih_search_responding_sas_devices -
   * @ioc: per adapter object
   *
   * After host reset, find out whether devices are still responding.
   * If not remove.
   *
   * Return nothing.
   */
  static void
  _scsih_search_responding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 ioc_status;
  	__le64 sas_address;
  	u16 handle;
  	u32 device_info;
  	u16 slot;
  
  	printk(MPT2SAS_INFO_FMT "search for end-devices: start\n", ioc->name);
  
  	if (list_empty(&ioc->sas_device_list))
  		goto out;
  
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
  	    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
  	    handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(sas_device_pg0.DevHandle);
  		device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);
  		if (!(_scsih_is_end_device(device_info)))
  			continue;
  		sas_address = le64_to_cpu(sas_device_pg0.SASAddress);
  		slot = le16_to_cpu(sas_device_pg0.Slot);
  		_scsih_mark_responding_sas_device(ioc, sas_address, slot,
  		    handle);
  	}
  out:
  	printk(MPT2SAS_INFO_FMT "search for end-devices: complete\n",
  	    ioc->name);
  }
  
  /**
   * _scsih_mark_responding_raid_device - mark a raid_device as responding
   * @ioc: per adapter object
   * @wwid: world wide identifier for raid volume
   * @handle: device handle
   *
   * After host reset, find out whether devices are still responding.
   * Used in _scsi_remove_unresponsive_raid_devices.
   *
   * Return nothing.
   */
  static void
  _scsih_mark_responding_raid_device(struct MPT2SAS_ADAPTER *ioc, u64 wwid,
      u16 handle)
  {
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct scsi_target *starget;
  	struct _raid_device *raid_device;
  	unsigned long flags;
  
  	spin_lock_irqsave(&ioc->raid_device_lock, flags);
  	list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
  		if (raid_device->wwid == wwid && raid_device->starget) {
  			starget = raid_device->starget;
  			if (starget && starget->hostdata) {
  				sas_target_priv_data = starget->hostdata;
  				sas_target_priv_data->deleted = 0;
  			} else
  				sas_target_priv_data = NULL;
  			raid_device->responding = 1;
  			spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  			starget_printk(KERN_INFO, raid_device->starget,
  			    "handle(0x%04x), wwid(0x%016llx)\n", handle,
  			    (unsigned long long)raid_device->wwid);
  			/*
  			 * WARPDRIVE: The handles of the PDs might have changed
  			 * across the host reset so re-initialize the
  			 * required data for Direct IO
  			 */
  			_scsih_init_warpdrive_properties(ioc, raid_device);
  			if (raid_device->handle == handle)
  				return;
  			printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
  			    raid_device->handle);
  			raid_device->handle = handle;
  			if (sas_target_priv_data)
  				sas_target_priv_data->handle = handle;
  			return;
  		}
  	}
  
  	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  }
  
  /**
   * _scsih_search_responding_raid_devices -
   * @ioc: per adapter object
   *
   * After host reset, find out whether devices are still responding.
   * If not remove.
   *
   * Return nothing.
   */
  static void
  _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2RaidVolPage1_t volume_pg1;
  	Mpi2RaidVolPage0_t volume_pg0;
  	Mpi2RaidPhysDiskPage0_t pd_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 ioc_status;
  	u16 handle;
  	u8 phys_disk_num;
  
  	if (!ioc->ir_firmware)
  		return;
  
  	printk(MPT2SAS_INFO_FMT "search for raid volumes: start\n",
  	    ioc->name);
  
  	if (list_empty(&ioc->raid_device_list))
  		goto out;
  
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  	    &volume_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(volume_pg1.DevHandle);
  
  		if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply,
  		    &volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
  		     sizeof(Mpi2RaidVolPage0_t)))
  			continue;
  
  		if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
  		    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
  		    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED)
  			_scsih_mark_responding_raid_device(ioc,
  			    le64_to_cpu(volume_pg1.WWID), handle);
  	}
  
  	/* refresh the pd_handles */
  	if (!ioc->is_warpdrive) {
  		phys_disk_num = 0xFF;
  		memset(ioc->pd_handles, 0, ioc->pd_handles_sz);
  		while (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
  		    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
  		    phys_disk_num))) {
  			ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  			    MPI2_IOCSTATUS_MASK;
  			if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  				break;
  			phys_disk_num = pd_pg0.PhysDiskNum;
  			handle = le16_to_cpu(pd_pg0.DevHandle);
  			set_bit(handle, ioc->pd_handles);
  		}
  	}
  out:
  	printk(MPT2SAS_INFO_FMT "search for responding raid volumes: "
  	    "complete\n", ioc->name);
  }
  
  /**
   * _scsih_mark_responding_expander - mark a expander as responding
   * @ioc: per adapter object
   * @sas_address: sas address
   * @handle:
   *
   * After host reset, find out whether devices are still responding.
   * Used in _scsi_remove_unresponsive_expanders.
   *
   * Return nothing.
   */
  static void
  _scsih_mark_responding_expander(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
       u16 handle)
  {
  	struct _sas_node *sas_expander;
  	unsigned long flags;
  	int i;
  
  	spin_lock_irqsave(&ioc->sas_node_lock, flags);
  	list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
  		if (sas_expander->sas_address != sas_address)
  			continue;
  		sas_expander->responding = 1;
  		if (sas_expander->handle == handle)
  			goto out;
  		printk(KERN_INFO "\texpander(0x%016llx): handle changed"
  		    " from(0x%04x) to (0x%04x)!!!\n",
  		    (unsigned long long)sas_expander->sas_address,
  		    sas_expander->handle, handle);
  		sas_expander->handle = handle;
  		for (i = 0 ; i < sas_expander->num_phys ; i++)
  			sas_expander->phy[i].handle = handle;
  		goto out;
  	}
   out:
  	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
  }
  
  /**
   * _scsih_search_responding_expanders -
   * @ioc: per adapter object
   *
   * After host reset, find out whether devices are still responding.
   * If not remove.
   *
   * Return nothing.
   */
  static void
  _scsih_search_responding_expanders(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2ExpanderPage0_t expander_pg0;
  	Mpi2ConfigReply_t mpi_reply;
  	u16 ioc_status;
  	u64 sas_address;
  	u16 handle;
  
  	printk(MPT2SAS_INFO_FMT "search for expanders: start\n", ioc->name);
  
  	if (list_empty(&ioc->sas_expander_list))
  		goto out;
  
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
  	    MPI2_SAS_EXPAND_PGAD_FORM_GET_NEXT_HNDL, handle))) {
  
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  
  		handle = le16_to_cpu(expander_pg0.DevHandle);
  		sas_address = le64_to_cpu(expander_pg0.SASAddress);
  		printk(KERN_INFO "\texpander present: handle(0x%04x), "
  		    "sas_addr(0x%016llx)\n", handle,
  		    (unsigned long long)sas_address);
  		_scsih_mark_responding_expander(ioc, sas_address, handle);
  	}
  
   out:
  	printk(MPT2SAS_INFO_FMT "search for expanders: complete\n", ioc->name);
  }
  
  /**
   * _scsih_remove_unresponding_sas_devices - removing unresponding devices
   * @ioc: per adapter object
   *
   * Return nothing.
   */
  static void
  _scsih_remove_unresponding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct _sas_device *sas_device, *sas_device_next;
  	struct _sas_node *sas_expander;
  	struct _raid_device *raid_device, *raid_device_next;
  
  	printk(MPT2SAS_INFO_FMT "removing unresponding devices: start\n",
  	    ioc->name);
  
  	list_for_each_entry_safe(sas_device, sas_device_next,
  	    &ioc->sas_device_list, list) {
  		if (sas_device->responding) {
  			sas_device->responding = 0;
  			continue;
  		}
  		if (sas_device->starget)
  			starget_printk(KERN_INFO, sas_device->starget,
  			    "removing: handle(0x%04x), sas_addr(0x%016llx), "
  			    "enclosure logical id(0x%016llx), slot(%d)\n",
  			    sas_device->handle,
  			    (unsigned long long)sas_device->sas_address,
  			    (unsigned long long)
  			    sas_device->enclosure_logical_id,
  			    sas_device->slot);
  		_scsih_remove_device(ioc, sas_device);
  	}
  
  	if (!ioc->ir_firmware)
  		goto retry_expander_search;
  
  	list_for_each_entry_safe(raid_device, raid_device_next,
  	    &ioc->raid_device_list, list) {
  		if (raid_device->responding) {
  			raid_device->responding = 0;
  			continue;
  		}
  		if (raid_device->starget) {
  			starget_printk(KERN_INFO, raid_device->starget,
  			    "removing: handle(0x%04x), wwid(0x%016llx)\n",
  			      raid_device->handle,
  			    (unsigned long long)raid_device->wwid);
  			scsi_remove_target(&raid_device->starget->dev);
  		}
  		_scsih_raid_device_remove(ioc, raid_device);
  	}
  
   retry_expander_search:
  	sas_expander = NULL;
  	list_for_each_entry(sas_expander, &ioc->sas_expander_list, list) {
  		if (sas_expander->responding) {
  			sas_expander->responding = 0;
  			continue;
  		}
  		mpt2sas_expander_remove(ioc, sas_expander->sas_address);
  		goto retry_expander_search;
  	}
  	printk(MPT2SAS_INFO_FMT "removing unresponding devices: complete\n",
  	    ioc->name);
  	/* unblock devices */
  	_scsih_ublock_io_all_device(ioc);
  }
  
  static void
  _scsih_refresh_expander_links(struct MPT2SAS_ADAPTER *ioc,
  	struct _sas_node *sas_expander, u16 handle)
  {
  	Mpi2ExpanderPage1_t expander_pg1;
  	Mpi2ConfigReply_t mpi_reply;
  	int i;
  
  	for (i = 0 ; i < sas_expander->num_phys ; i++) {
  		if ((mpt2sas_config_get_expander_pg1(ioc, &mpi_reply,
  		    &expander_pg1, i, handle))) {
  			printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  			    ioc->name, __FILE__, __LINE__, __func__);
  			return;
  		}
  
  		mpt2sas_transport_update_links(ioc, sas_expander->sas_address,
  		    le16_to_cpu(expander_pg1.AttachedDevHandle), i,
  		    expander_pg1.NegotiatedLinkRate >> 4);
  	}
  }
  
  /**
   * _scsih_scan_for_devices_after_reset - scan for devices after host reset
   * @ioc: per adapter object
   *
   * Return nothing.
   */
  static void
  _scsih_scan_for_devices_after_reset(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2ExpanderPage0_t expander_pg0;
  	Mpi2SasDevicePage0_t sas_device_pg0;
  	Mpi2RaidVolPage1_t volume_pg1;
  	Mpi2RaidVolPage0_t volume_pg0;
  	Mpi2RaidPhysDiskPage0_t pd_pg0;
  	Mpi2EventIrConfigElement_t element;
  	Mpi2ConfigReply_t mpi_reply;
  	u8 phys_disk_num;
  	u16 ioc_status;
  	u16 handle, parent_handle;
  	u64 sas_address;
  	struct _sas_device *sas_device;
  	struct _sas_node *expander_device;
  	static struct _raid_device *raid_device;
  
  	printk(MPT2SAS_INFO_FMT "scan devices: start\n", ioc->name);
  
  	_scsih_sas_host_refresh(ioc);
  
  	/* expanders */
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
  	    MPI2_SAS_EXPAND_PGAD_FORM_GET_NEXT_HNDL, handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(expander_pg0.DevHandle);
  		expander_device = mpt2sas_scsih_expander_find_by_sas_address(
  		    ioc, le64_to_cpu(expander_pg0.SASAddress));
  		if (expander_device)
  			_scsih_refresh_expander_links(ioc, expander_device,
  			    handle);
  		else
  			_scsih_expander_add(ioc, handle);
  	}
  
  	if (!ioc->ir_firmware)
  		goto skip_to_sas;
  
  	/* phys disk */
  	phys_disk_num = 0xFF;
  	while (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
  	    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
  	    phys_disk_num))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		phys_disk_num = pd_pg0.PhysDiskNum;
  		handle = le16_to_cpu(pd_pg0.DevHandle);
  		sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
  		if (sas_device)
  			continue;
  		if (mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
  		    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
  		    handle) != 0)
  			continue;
  		parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
  		if (!_scsih_get_sas_address(ioc, parent_handle,
  		    &sas_address)) {
  			mpt2sas_transport_update_links(ioc, sas_address,
  			    handle, sas_device_pg0.PhyNum,
  			    MPI2_SAS_NEG_LINK_RATE_1_5);
  			set_bit(handle, ioc->pd_handles);
  			_scsih_add_device(ioc, handle, 0, 1);
  		}
  	}
  
  	/* volumes */
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  	    &volume_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(volume_pg1.DevHandle);
  		raid_device = _scsih_raid_device_find_by_wwid(ioc,
  		    le64_to_cpu(volume_pg1.WWID));
  		if (raid_device)
  			continue;
  		if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply,
  		    &volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
  		     sizeof(Mpi2RaidVolPage0_t)))
  			continue;
  		if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
  		    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
  		    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED) {
  			memset(&element, 0, sizeof(Mpi2EventIrConfigElement_t));
  			element.ReasonCode = MPI2_EVENT_IR_CHANGE_RC_ADDED;
  			element.VolDevHandle = volume_pg1.DevHandle;
  			_scsih_sas_volume_add(ioc, &element);
  		}
  	}
  
   skip_to_sas:
  
  	/* sas devices */
  	handle = 0xFFFF;
  	while (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
  	    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
  	    handle))) {
  		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  		    MPI2_IOCSTATUS_MASK;
  		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  			break;
  		handle = le16_to_cpu(sas_device_pg0.DevHandle);
  		if (!(_scsih_is_end_device(
  		    le32_to_cpu(sas_device_pg0.DeviceInfo))))
  			continue;
  		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
  		    le64_to_cpu(sas_device_pg0.SASAddress));
  		if (sas_device)
  			continue;
  		parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
  		if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address)) {
  			mpt2sas_transport_update_links(ioc, sas_address, handle,
  			    sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
  			_scsih_add_device(ioc, handle, 0, 0);
  		}
  	}
  
  	printk(MPT2SAS_INFO_FMT "scan devices: complete\n", ioc->name);
  }
  
  
  /**
   * mpt2sas_scsih_reset_handler - reset callback handler (for scsih)
   * @ioc: per adapter object
   * @reset_phase: phase
   *
   * The handler for doing any required cleanup or initialization.
   *
   * The reset phase can be MPT2_IOC_PRE_RESET, MPT2_IOC_AFTER_RESET,
   * MPT2_IOC_DONE_RESET
   *
   * Return nothing.
   */
  void
  mpt2sas_scsih_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
  {
  	switch (reset_phase) {
  	case MPT2_IOC_PRE_RESET:
  		dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: "
  		    "MPT2_IOC_PRE_RESET\n", ioc->name, __func__));
  		break;
  	case MPT2_IOC_AFTER_RESET:
  		dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: "
  		    "MPT2_IOC_AFTER_RESET\n", ioc->name, __func__));
  		if (ioc->scsih_cmds.status & MPT2_CMD_PENDING) {
  			ioc->scsih_cmds.status |= MPT2_CMD_RESET;
  			mpt2sas_base_free_smid(ioc, ioc->scsih_cmds.smid);
  			complete(&ioc->scsih_cmds.done);
  		}
  		if (ioc->tm_cmds.status & MPT2_CMD_PENDING) {
  			ioc->tm_cmds.status |= MPT2_CMD_RESET;
  			mpt2sas_base_free_smid(ioc, ioc->tm_cmds.smid);
  			complete(&ioc->tm_cmds.done);
  		}
  		_scsih_fw_event_cleanup_queue(ioc);
  		_scsih_flush_running_cmds(ioc);
  		break;
  	case MPT2_IOC_DONE_RESET:
  		dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: "
  		    "MPT2_IOC_DONE_RESET\n", ioc->name, __func__));
  		_scsih_sas_host_refresh(ioc);
  		_scsih_prep_device_scan(ioc);
  		_scsih_search_responding_sas_devices(ioc);
  		_scsih_search_responding_raid_devices(ioc);
  		_scsih_search_responding_expanders(ioc);
  		if (!ioc->is_driver_loading) {
  			_scsih_prep_device_scan(ioc);
  			_scsih_search_responding_sas_devices(ioc);
  			_scsih_search_responding_raid_devices(ioc);
  			_scsih_search_responding_expanders(ioc);
  			_scsih_error_recovery_delete_devices(ioc);
  		}
  		break;
  	}
  }
  
  /**
   * _firmware_event_work - delayed task for processing firmware events
   * @ioc: per adapter object
   * @work: equal to the fw_event_work object
   * Context: user.
   *
   * Return nothing.
   */
  static void
  _firmware_event_work(struct work_struct *work)
  {
  	struct fw_event_work *fw_event = container_of(work,
  	    struct fw_event_work, delayed_work.work);
  	struct MPT2SAS_ADAPTER *ioc = fw_event->ioc;
  
  	/* the queue is being flushed so ignore this event */
  	if (ioc->remove_host || fw_event->cancel_pending_work ||
  	    ioc->pci_error_recovery) {
  		_scsih_fw_event_free(ioc, fw_event);
  		return;
  	}
  
  	switch (fw_event->event) {
  	case MPT2SAS_REMOVE_UNRESPONDING_DEVICES:
  		while (scsi_host_in_recovery(ioc->shost))
  			ssleep(1);
  		_scsih_remove_unresponding_sas_devices(ioc);
  		_scsih_scan_for_devices_after_reset(ioc);
  		break;
  	case MPT2SAS_PORT_ENABLE_COMPLETE:
  		ioc->start_scan = 0;
  
  
  
  		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "port enable: complete "
  		    "from worker thread\n", ioc->name));
  		break;
  	case MPT2SAS_TURN_ON_FAULT_LED:
  		_scsih_turn_on_fault_led(ioc, fw_event->device_handle);
  		break;
  	case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
  		_scsih_sas_topology_change_event(ioc, fw_event);
  		break;
  	case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
  		_scsih_sas_device_status_change_event(ioc,
  		    fw_event);
  		break;
  	case MPI2_EVENT_SAS_DISCOVERY:
  		_scsih_sas_discovery_event(ioc,
  		    fw_event);
  		break;
  	case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
  		_scsih_sas_broadcast_primitive_event(ioc,
  		    fw_event);
  		break;
  	case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
  		_scsih_sas_enclosure_dev_status_change_event(ioc,
  		    fw_event);
  		break;
  	case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
  		_scsih_sas_ir_config_change_event(ioc, fw_event);
  		break;
  	case MPI2_EVENT_IR_VOLUME:
  		_scsih_sas_ir_volume_event(ioc, fw_event);
  		break;
  	case MPI2_EVENT_IR_PHYSICAL_DISK:
  		_scsih_sas_ir_physical_disk_event(ioc, fw_event);
  		break;
  	case MPI2_EVENT_IR_OPERATION_STATUS:
  		_scsih_sas_ir_operation_status_event(ioc, fw_event);
  		break;
  	}
  	_scsih_fw_event_free(ioc, fw_event);
  }
  
  /**
   * mpt2sas_scsih_event_callback - firmware event handler (called at ISR time)
   * @ioc: per adapter object
   * @msix_index: MSIX table index supplied by the OS
   * @reply: reply message frame(lower 32bit addr)
   * Context: interrupt.
   *
   * This function merely adds a new work task into ioc->firmware_event_thread.
   * The tasks are worked from _firmware_event_work in user context.
   *
   * Return 1 meaning mf should be freed from _base_interrupt
   *        0 means the mf is freed from this function.
   */
  u8
  mpt2sas_scsih_event_callback(struct MPT2SAS_ADAPTER *ioc, u8 msix_index,
  	u32 reply)
  {
  	struct fw_event_work *fw_event;
  	Mpi2EventNotificationReply_t *mpi_reply;
  	u16 event;
  	u16 sz;
  
  	/* events turned off due to host reset or driver unloading */
  	if (ioc->remove_host || ioc->pci_error_recovery)
  		return 1;
  
  	mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
  	event = le16_to_cpu(mpi_reply->Event);
  
  	switch (event) {
  	/* handle these */
  	case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
  	{
  		Mpi2EventDataSasBroadcastPrimitive_t *baen_data =
  		    (Mpi2EventDataSasBroadcastPrimitive_t *)
  		    mpi_reply->EventData;
  
  		if (baen_data->Primitive !=
  		    MPI2_EVENT_PRIMITIVE_ASYNCHRONOUS_EVENT)
  			return 1;
  
  		if (ioc->broadcast_aen_busy) {
  			ioc->broadcast_aen_pending++;
  			return 1;
  		} else
  			ioc->broadcast_aen_busy = 1;
  		break;
  	}
  
  	case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
  		_scsih_check_topo_delete_events(ioc,
  		    (Mpi2EventDataSasTopologyChangeList_t *)
  		    mpi_reply->EventData);
  		break;
  	case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
  		_scsih_check_ir_config_unhide_events(ioc,
  		    (Mpi2EventDataIrConfigChangeList_t *)
  		    mpi_reply->EventData);
  		break;
  	case MPI2_EVENT_IR_VOLUME:
  		_scsih_check_volume_delete_events(ioc,
  		    (Mpi2EventDataIrVolume_t *)
  		    mpi_reply->EventData);
  		break;
  	case MPI2_EVENT_LOG_ENTRY_ADDED:
  	{
  		Mpi2EventDataLogEntryAdded_t *log_entry;
  		u32 *log_code;
  
  		if (!ioc->is_warpdrive)
  			break;
  
  		log_entry = (Mpi2EventDataLogEntryAdded_t *)
  		    mpi_reply->EventData;
  		log_code = (u32 *)log_entry->LogData;
  
  		if (le16_to_cpu(log_entry->LogEntryQualifier)
  		    != MPT2_WARPDRIVE_LOGENTRY)
  			break;
  
  		switch (le32_to_cpu(*log_code)) {
  		case MPT2_WARPDRIVE_LC_SSDT:
  			printk(MPT2SAS_WARN_FMT "WarpDrive Warning: "
  			    "IO Throttling has occurred in the WarpDrive "
  			    "subsystem. Check WarpDrive documentation for "
  			    "additional details.\n", ioc->name);
  			break;
  		case MPT2_WARPDRIVE_LC_SSDLW:
  			printk(MPT2SAS_WARN_FMT "WarpDrive Warning: "
  			    "Program/Erase Cycles for the WarpDrive subsystem "
  			    "in degraded range. Check WarpDrive documentation "
  			    "for additional details.\n", ioc->name);
  			break;
  		case MPT2_WARPDRIVE_LC_SSDLF:
  			printk(MPT2SAS_ERR_FMT "WarpDrive Fatal Error: "
  			    "There are no Program/Erase Cycles for the "
  			    "WarpDrive subsystem. The storage device will be "
  			    "in read-only mode. Check WarpDrive documentation "
  			    "for additional details.\n", ioc->name);
  			break;
  		case MPT2_WARPDRIVE_LC_BRMF:
  			printk(MPT2SAS_ERR_FMT "WarpDrive Fatal Error: "
  			    "The Backup Rail Monitor has failed on the "
  			    "WarpDrive subsystem. Check WarpDrive "
  			    "documentation for additional details.\n",
  			    ioc->name);
  			break;
  		}
  
  		break;
  	}
  	case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
  	case MPI2_EVENT_IR_OPERATION_STATUS:
  	case MPI2_EVENT_SAS_DISCOVERY:
  	case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
  	case MPI2_EVENT_IR_PHYSICAL_DISK:
  		break;
  
  	default: /* ignore the rest */
  		return 1;
  	}
  
  	fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
  	if (!fw_event) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		return 1;
  	}
  	sz = le16_to_cpu(mpi_reply->EventDataLength) * 4;
  	fw_event->event_data = kzalloc(sz, GFP_ATOMIC);
  	if (!fw_event->event_data) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		kfree(fw_event);
  		return 1;
  	}
  
  	memcpy(fw_event->event_data, mpi_reply->EventData,
  	    sz);
  	fw_event->ioc = ioc;
  	fw_event->VF_ID = mpi_reply->VF_ID;
  	fw_event->VP_ID = mpi_reply->VP_ID;
  	fw_event->event = event;
  	_scsih_fw_event_add(ioc, fw_event);
  	return 1;
  }
  
  /* shost template */
  static struct scsi_host_template scsih_driver_template = {
  	.module				= THIS_MODULE,
  	.name				= "Fusion MPT SAS Host",
  	.proc_name			= MPT2SAS_DRIVER_NAME,
  	.queuecommand			= _scsih_qcmd,
  	.target_alloc			= _scsih_target_alloc,
  	.slave_alloc			= _scsih_slave_alloc,
  	.slave_configure		= _scsih_slave_configure,
  	.target_destroy			= _scsih_target_destroy,
  	.slave_destroy			= _scsih_slave_destroy,
  	.scan_finished			= _scsih_scan_finished,
  	.scan_start			= _scsih_scan_start,
  	.change_queue_depth 		= _scsih_change_queue_depth,
  	.change_queue_type		= _scsih_change_queue_type,
  	.eh_abort_handler		= _scsih_abort,
  	.eh_device_reset_handler	= _scsih_dev_reset,
  	.eh_target_reset_handler	= _scsih_target_reset,
  	.eh_host_reset_handler		= _scsih_host_reset,
  	.bios_param			= _scsih_bios_param,
  	.can_queue			= 1,
  	.this_id			= -1,
  	.sg_tablesize			= MPT2SAS_SG_DEPTH,
  	.max_sectors			= 32767,
  	.cmd_per_lun			= 7,
  	.use_clustering			= ENABLE_CLUSTERING,
  	.shost_attrs			= mpt2sas_host_attrs,
  	.sdev_attrs			= mpt2sas_dev_attrs,
  };
  
  /**
   * _scsih_expander_node_remove - removing expander device from list.
   * @ioc: per adapter object
   * @sas_expander: the sas_device object
   * Context: Calling function should acquire ioc->sas_node_lock.
   *
   * Removing object and freeing associated memory from the
   * ioc->sas_expander_list.
   *
   * Return nothing.
   */
  static void
  _scsih_expander_node_remove(struct MPT2SAS_ADAPTER *ioc,
      struct _sas_node *sas_expander)
  {
  	struct _sas_port *mpt2sas_port, *next;
  
  	/* remove sibling ports attached to this expander */
  	list_for_each_entry_safe(mpt2sas_port, next,
  	   &sas_expander->sas_port_list, port_list) {
  		if (ioc->shost_recovery)
  			return;
  		if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_END_DEVICE)
  			mpt2sas_device_remove(ioc,
  			    mpt2sas_port->remote_identify.sas_address);
  		else if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_EDGE_EXPANDER_DEVICE ||
  		    mpt2sas_port->remote_identify.device_type ==
  		    SAS_FANOUT_EXPANDER_DEVICE)
  			mpt2sas_expander_remove(ioc,
  			    mpt2sas_port->remote_identify.sas_address);
  	}
  
  	mpt2sas_transport_port_remove(ioc, sas_expander->sas_address,
  	    sas_expander->sas_address_parent);
  
  	printk(MPT2SAS_INFO_FMT "expander_remove: handle"
  	   "(0x%04x), sas_addr(0x%016llx)\n", ioc->name,
  	    sas_expander->handle, (unsigned long long)
  	    sas_expander->sas_address);
  
  	kfree(sas_expander->phy);
  	kfree(sas_expander);
  }
  
  /**
   * _scsih_ir_shutdown - IR shutdown notification
   * @ioc: per adapter object
   *
   * Sending RAID Action to alert the Integrated RAID subsystem of the IOC that
   * the host system is shutting down.
   *
   * Return nothing.
   */
  static void
  _scsih_ir_shutdown(struct MPT2SAS_ADAPTER *ioc)
  {
  	Mpi2RaidActionRequest_t *mpi_request;
  	Mpi2RaidActionReply_t *mpi_reply;
  	u16 smid;
  
  	/* is IR firmware build loaded ? */
  	if (!ioc->ir_firmware)
  		return;
  
  	/* are there any volumes ? */
  	if (list_empty(&ioc->raid_device_list))
  		return;
  
  	mutex_lock(&ioc->scsih_cmds.mutex);
  
  	if (ioc->scsih_cmds.status != MPT2_CMD_NOT_USED) {
  		printk(MPT2SAS_ERR_FMT "%s: scsih_cmd in use\n",
  		    ioc->name, __func__);
  		goto out;
  	}
  	ioc->scsih_cmds.status = MPT2_CMD_PENDING;
  
  	smid = mpt2sas_base_get_smid(ioc, ioc->scsih_cb_idx);
  	if (!smid) {
  		printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
  		    ioc->name, __func__);
  		ioc->scsih_cmds.status = MPT2_CMD_NOT_USED;
  		goto out;
  	}
  
  	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
  	ioc->scsih_cmds.smid = smid;
  	memset(mpi_request, 0, sizeof(Mpi2RaidActionRequest_t));
  
  	mpi_request->Function = MPI2_FUNCTION_RAID_ACTION;
  	mpi_request->Action = MPI2_RAID_ACTION_SYSTEM_SHUTDOWN_INITIATED;
  
  	if (!ioc->hide_ir_msg)
  		printk(MPT2SAS_INFO_FMT "IR shutdown (sending)\n", ioc->name);
  	init_completion(&ioc->scsih_cmds.done);
  	mpt2sas_base_put_smid_default(ioc, smid);
  	wait_for_completion_timeout(&ioc->scsih_cmds.done, 10*HZ);
  
  	if (!(ioc->scsih_cmds.status & MPT2_CMD_COMPLETE)) {
  		printk(MPT2SAS_ERR_FMT "%s: timeout\n",
  		    ioc->name, __func__);
  		goto out;
  	}
  
  	if (ioc->scsih_cmds.status & MPT2_CMD_REPLY_VALID) {
  		mpi_reply = ioc->scsih_cmds.reply;
  
  		if (!ioc->hide_ir_msg)
  			printk(MPT2SAS_INFO_FMT "IR shutdown (complete): "
  			    "ioc_status(0x%04x), loginfo(0x%08x)\n",
  			    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
  			    le32_to_cpu(mpi_reply->IOCLogInfo));
  	}
  
   out:
  	ioc->scsih_cmds.status = MPT2_CMD_NOT_USED;
  	mutex_unlock(&ioc->scsih_cmds.mutex);
  }
  
  /**
   * _scsih_shutdown - routine call during system shutdown
   * @pdev: PCI device struct
   *
   * Return nothing.
   */
  static void
  _scsih_shutdown(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct workqueue_struct	*wq;
  	unsigned long flags;
  
  	ioc->remove_host = 1;
  	_scsih_fw_event_cleanup_queue(ioc);
  
  	spin_lock_irqsave(&ioc->fw_event_lock, flags);
  	wq = ioc->firmware_event_thread;
  	ioc->firmware_event_thread = NULL;
  	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
  	if (wq)
  		destroy_workqueue(wq);
  
  	_scsih_ir_shutdown(ioc);
  	mpt2sas_base_detach(ioc);
  }
  
  /**
   * _scsih_remove - detach and remove add host
   * @pdev: PCI device struct
   *
   * Routine called when unloading the driver.
   * Return nothing.
   */
  static void __devexit
  _scsih_remove(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	struct _sas_port *mpt2sas_port, *next_port;
  	struct _raid_device *raid_device, *next;
  	struct MPT2SAS_TARGET *sas_target_priv_data;
  	struct workqueue_struct	*wq;
  	unsigned long flags;
  
  	ioc->remove_host = 1;
  	_scsih_fw_event_cleanup_queue(ioc);
  
  	spin_lock_irqsave(&ioc->fw_event_lock, flags);
  	wq = ioc->firmware_event_thread;
  	ioc->firmware_event_thread = NULL;
  	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
  	if (wq)
  		destroy_workqueue(wq);
  
  	/* release all the volumes */
  	_scsih_ir_shutdown(ioc);
  	list_for_each_entry_safe(raid_device, next, &ioc->raid_device_list,
  	    list) {
  		if (raid_device->starget) {
  			sas_target_priv_data =
  			    raid_device->starget->hostdata;
  			sas_target_priv_data->deleted = 1;
  			scsi_remove_target(&raid_device->starget->dev);
  		}
  		printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), wwid"
  		    "(0x%016llx)\n", ioc->name,  raid_device->handle,
  		    (unsigned long long) raid_device->wwid);
  		_scsih_raid_device_remove(ioc, raid_device);
  	}
  
  	/* free ports attached to the sas_host */
  	list_for_each_entry_safe(mpt2sas_port, next_port,
  	   &ioc->sas_hba.sas_port_list, port_list) {
  		if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_END_DEVICE)
  			mpt2sas_device_remove(ioc,
  			    mpt2sas_port->remote_identify.sas_address);
  		else if (mpt2sas_port->remote_identify.device_type ==
  		    SAS_EDGE_EXPANDER_DEVICE ||
  		    mpt2sas_port->remote_identify.device_type ==
  		    SAS_FANOUT_EXPANDER_DEVICE)
  			mpt2sas_expander_remove(ioc,
  			    mpt2sas_port->remote_identify.sas_address);
  	}
  
  	/* free phys attached to the sas_host */
  	if (ioc->sas_hba.num_phys) {
  		kfree(ioc->sas_hba.phy);
  		ioc->sas_hba.phy = NULL;
  		ioc->sas_hba.num_phys = 0;
  	}
  
  	sas_remove_host(shost);
  	mpt2sas_base_detach(ioc);
  	list_del(&ioc->list);
  	scsi_remove_host(shost);
  	scsi_host_put(shost);
  }
  
  /**
   * _scsih_probe_boot_devices - reports 1st device
   * @ioc: per adapter object
   *
   * If specified in bios page 2, this routine reports the 1st
   * device scsi-ml or sas transport for persistent boot device
   * purposes.  Please refer to function _scsih_determine_boot_device()
   */
  static void
  _scsih_probe_boot_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	u8 is_raid;
  	void *device;
  	struct _sas_device *sas_device;
  	struct _raid_device *raid_device;
  	u16 handle;
  	u64 sas_address_parent;
  	u64 sas_address;
  	unsigned long flags;
  	int rc;
  
  	 /* no Bios, return immediately */
  	if (!ioc->bios_pg3.BiosVersion)
  		return;
  
  	device = NULL;
  	is_raid = 0;
  	if (ioc->req_boot_device.device) {
  		device =  ioc->req_boot_device.device;
  		is_raid = ioc->req_boot_device.is_raid;
  	} else if (ioc->req_alt_boot_device.device) {
  		device =  ioc->req_alt_boot_device.device;
  		is_raid = ioc->req_alt_boot_device.is_raid;
  	} else if (ioc->current_boot_device.device) {
  		device =  ioc->current_boot_device.device;
  		is_raid = ioc->current_boot_device.is_raid;
  	}
  
  	if (!device)
  		return;
  
  	if (is_raid) {
  		raid_device = device;
  		rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
  		    raid_device->id, 0);
  		if (rc)
  			_scsih_raid_device_remove(ioc, raid_device);
  	} else {
  		sas_device = device;
  		handle = sas_device->handle;
  		sas_address_parent = sas_device->sas_address_parent;
  		sas_address = sas_device->sas_address;
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		list_move_tail(&sas_device->list, &ioc->sas_device_list);
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  
  		if (ioc->hide_drives)
  			return;
  		if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
  		    sas_device->sas_address_parent)) {
  			_scsih_sas_device_remove(ioc, sas_device);
  		} else if (!sas_device->starget) {
  			if (!ioc->is_driver_loading)
  				mpt2sas_transport_port_remove(ioc, sas_address,
  					sas_address_parent);
  			_scsih_sas_device_remove(ioc, sas_device);
  		}
  	}
  }
  
  /**
   * _scsih_probe_raid - reporting raid volumes to scsi-ml
   * @ioc: per adapter object
   *
   * Called during initial loading of the driver.
   */
  static void
  _scsih_probe_raid(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct _raid_device *raid_device, *raid_next;
  	int rc;
  
  	list_for_each_entry_safe(raid_device, raid_next,
  	    &ioc->raid_device_list, list) {
  		if (raid_device->starget)
  			continue;
  		rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
  		    raid_device->id, 0);
  		if (rc)
  			_scsih_raid_device_remove(ioc, raid_device);
  	}
  }
  
  /**
   * _scsih_probe_sas - reporting sas devices to sas transport
   * @ioc: per adapter object
   *
   * Called during initial loading of the driver.
   */
  static void
  _scsih_probe_sas(struct MPT2SAS_ADAPTER *ioc)
  {
  	struct _sas_device *sas_device, *next;
  	unsigned long flags;
  
  	/* SAS Device List */
  	list_for_each_entry_safe(sas_device, next, &ioc->sas_device_init_list,
  	    list) {
  
  		if (ioc->hide_drives)
  			continue;
  
  		if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
  		    sas_device->sas_address_parent)) {
  			list_del(&sas_device->list);
  			kfree(sas_device);
  			continue;
  		} else if (!sas_device->starget) {
  			if (!ioc->is_driver_loading)
  				mpt2sas_transport_port_remove(ioc,
  					sas_device->sas_address,
  					sas_device->sas_address_parent);
  			list_del(&sas_device->list);
  			kfree(sas_device);
  			continue;
  
  		}
  		spin_lock_irqsave(&ioc->sas_device_lock, flags);
  		list_move_tail(&sas_device->list, &ioc->sas_device_list);
  		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
  	}
  }
  
  /**
   * _scsih_probe_devices - probing for devices
   * @ioc: per adapter object
   *
   * Called during initial loading of the driver.
   */
  static void
  _scsih_probe_devices(struct MPT2SAS_ADAPTER *ioc)
  {
  	u16 volume_mapping_flags;
  
  	if (!(ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_INITIATOR))
  		return;  /* return when IOC doesn't support initiator mode */
  
  	_scsih_probe_boot_devices(ioc);
  
  	if (ioc->ir_firmware) {
  		volume_mapping_flags =
  		    le16_to_cpu(ioc->ioc_pg8.IRVolumeMappingFlags) &
  		    MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
  		if (volume_mapping_flags ==
  		    MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING) {
  			_scsih_probe_raid(ioc);
  			_scsih_probe_sas(ioc);
  		} else {
  			_scsih_probe_sas(ioc);
  			_scsih_probe_raid(ioc);
  		}
  	} else
  		_scsih_probe_sas(ioc);
  }
  
  
  /**
   * _scsih_scan_start - scsi lld callback for .scan_start
   * @shost: SCSI host pointer
   *
   * The shost has the ability to discover targets on its own instead
   * of scanning the entire bus.  In our implemention, we will kick off
   * firmware discovery.
   */
  static void
  _scsih_scan_start(struct Scsi_Host *shost)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	int rc;
  
  	if (diag_buffer_enable != -1 && diag_buffer_enable != 0)
  		mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
  
  	ioc->start_scan = 1;
  	rc = mpt2sas_port_enable(ioc);
  
  	if (rc != 0)
  		printk(MPT2SAS_INFO_FMT "port enable: FAILED\n", ioc->name);
  }
  
  /**
   * _scsih_scan_finished - scsi lld callback for .scan_finished
   * @shost: SCSI host pointer
   * @time: elapsed time of the scan in jiffies
   *
   * This function will be called periodically until it returns 1 with the
   * scsi_host and the elapsed time of the scan in jiffies. In our implemention,
   * we wait for firmware discovery to complete, then return 1.
   */
  static int
  _scsih_scan_finished(struct Scsi_Host *shost, unsigned long time)
  {
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  
  	if (time >= (300 * HZ)) {
  		ioc->base_cmds.status = MPT2_CMD_NOT_USED;
  		printk(MPT2SAS_INFO_FMT "port enable: FAILED with timeout "
  		    "(timeout=300s)\n", ioc->name);
  		ioc->is_driver_loading = 0;
  		return 1;
  	}
  
  	if (ioc->start_scan)
  		return 0;
  
  	if (ioc->start_scan_failed) {
  		printk(MPT2SAS_INFO_FMT "port enable: FAILED with "
  		    "(ioc_status=0x%08x)\n", ioc->name, ioc->start_scan_failed);
  		ioc->is_driver_loading = 0;
  		ioc->wait_for_discovery_to_complete = 0;
  		ioc->remove_host = 1;
  		return 1;
  	}
  
  	printk(MPT2SAS_INFO_FMT "port enable: SUCCESS\n", ioc->name);
  	ioc->base_cmds.status = MPT2_CMD_NOT_USED;
  
  	if (ioc->wait_for_discovery_to_complete) {
  		ioc->wait_for_discovery_to_complete = 0;
  		_scsih_probe_devices(ioc);
  	}
  	mpt2sas_base_start_watchdog(ioc);
  	ioc->is_driver_loading = 0;
  	return 1;
  }
  
  
  /**
   * _scsih_probe - attach and add scsi host
   * @pdev: PCI device struct
   * @id: pci device id
   *
   * Returns 0 success, anything else error.
   */
  static int
  _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  {
  	struct MPT2SAS_ADAPTER *ioc;
  	struct Scsi_Host *shost;
  
  	shost = scsi_host_alloc(&scsih_driver_template,
  	    sizeof(struct MPT2SAS_ADAPTER));
  	if (!shost)
  		return -ENODEV;
  
  	/* init local params */
  	ioc = shost_priv(shost);
  	memset(ioc, 0, sizeof(struct MPT2SAS_ADAPTER));
  	INIT_LIST_HEAD(&ioc->list);
  	list_add_tail(&ioc->list, &mpt2sas_ioc_list);
  	ioc->shost = shost;
  	ioc->id = mpt_ids++;
  	sprintf(ioc->name, "%s%d", MPT2SAS_DRIVER_NAME, ioc->id);
  	ioc->pdev = pdev;
  	if (id->device == MPI2_MFGPAGE_DEVID_SSS6200) {
  		ioc->is_warpdrive = 1;
  		ioc->hide_ir_msg = 1;
  	} else
  		ioc->mfg_pg10_hide_flag = MFG_PAGE10_EXPOSE_ALL_DISKS;
  	ioc->scsi_io_cb_idx = scsi_io_cb_idx;
  	ioc->tm_cb_idx = tm_cb_idx;
  	ioc->ctl_cb_idx = ctl_cb_idx;
  	ioc->base_cb_idx = base_cb_idx;
  	ioc->port_enable_cb_idx = port_enable_cb_idx;
  	ioc->transport_cb_idx = transport_cb_idx;
  	ioc->scsih_cb_idx = scsih_cb_idx;
  	ioc->config_cb_idx = config_cb_idx;
  	ioc->tm_tr_cb_idx = tm_tr_cb_idx;
  	ioc->tm_tr_volume_cb_idx = tm_tr_volume_cb_idx;
  	ioc->tm_sas_control_cb_idx = tm_sas_control_cb_idx;
  	ioc->logging_level = logging_level;
  	ioc->schedule_dead_ioc_flush_running_cmds = &_scsih_flush_running_cmds;
  	/* misc semaphores and spin locks */
  	mutex_init(&ioc->reset_in_progress_mutex);
  	spin_lock_init(&ioc->ioc_reset_in_progress_lock);
  	spin_lock_init(&ioc->scsi_lookup_lock);
  	spin_lock_init(&ioc->sas_device_lock);
  	spin_lock_init(&ioc->sas_node_lock);
  	spin_lock_init(&ioc->fw_event_lock);
  	spin_lock_init(&ioc->raid_device_lock);
  
  	INIT_LIST_HEAD(&ioc->sas_device_list);
  	INIT_LIST_HEAD(&ioc->sas_device_init_list);
  	INIT_LIST_HEAD(&ioc->sas_expander_list);
  	INIT_LIST_HEAD(&ioc->fw_event_list);
  	INIT_LIST_HEAD(&ioc->raid_device_list);
  	INIT_LIST_HEAD(&ioc->sas_hba.sas_port_list);
  	INIT_LIST_HEAD(&ioc->delayed_tr_list);
  	INIT_LIST_HEAD(&ioc->delayed_tr_volume_list);
  
  	/* init shost parameters */
  	shost->max_cmd_len = 32;
  	shost->max_lun = max_lun;
  	shost->transportt = mpt2sas_transport_template;
  	shost->unique_id = ioc->id;
  
  	if (max_sectors != 0xFFFF) {
  		if (max_sectors < 64) {
  			shost->max_sectors = 64;
  			printk(MPT2SAS_WARN_FMT "Invalid value %d passed "
  			    "for max_sectors, range is 64 to 8192. Assigning "
  			    "value of 64.\n", ioc->name, max_sectors);
  		} else if (max_sectors > 32767) {
  			shost->max_sectors = 32767;
  			printk(MPT2SAS_WARN_FMT "Invalid value %d passed "
  			    "for max_sectors, range is 64 to 8192. Assigning "
  			    "default value of 32767.\n", ioc->name,
  			    max_sectors);
  		} else {
  			shost->max_sectors = max_sectors & 0xFFFE;
  			printk(MPT2SAS_INFO_FMT "The max_sectors value is "
  			    "set to %d\n", ioc->name, shost->max_sectors);
  		}
  	}
  
  	if ((scsi_add_host(shost, &pdev->dev))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		list_del(&ioc->list);
  		goto out_add_shost_fail;
  	}
  
  	scsi_host_set_prot(shost, SHOST_DIF_TYPE1_PROTECTION
  	    | SHOST_DIF_TYPE2_PROTECTION | SHOST_DIF_TYPE3_PROTECTION);
  	scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
  
  	/* event thread */
  	snprintf(ioc->firmware_event_name, sizeof(ioc->firmware_event_name),
  	    "fw_event%d", ioc->id);
  	ioc->firmware_event_thread = create_singlethread_workqueue(
  	    ioc->firmware_event_name);
  	if (!ioc->firmware_event_thread) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out_thread_fail;
  	}
  
  	ioc->is_driver_loading = 1;
  	if ((mpt2sas_base_attach(ioc))) {
  		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
  		    ioc->name, __FILE__, __LINE__, __func__);
  		goto out_attach_fail;
  	}
  
  	if (ioc->is_warpdrive) {
  		if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS)
  			ioc->hide_drives = 0;
  		else if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_HIDE_ALL_DISKS)
  			ioc->hide_drives = 1;
  		else {
  			if (_scsih_get_num_volumes(ioc))
  				ioc->hide_drives = 1;
  			else
  				ioc->hide_drives = 0;
  		}
  	} else
  		ioc->hide_drives = 0;
  	scsi_scan_host(shost);
  
  	return 0;
  
   out_attach_fail:
  	destroy_workqueue(ioc->firmware_event_thread);
   out_thread_fail:
  	list_del(&ioc->list);
  	scsi_remove_host(shost);
  	scsi_host_put(shost);
   out_add_shost_fail:
  	return -ENODEV;
  }
  
  #ifdef CONFIG_PM
  /**
   * _scsih_suspend - power management suspend main entry point
   * @pdev: PCI device struct
   * @state: PM state change to (usually PCI_D3)
   *
   * Returns 0 success, anything else error.
   */
  static int
  _scsih_suspend(struct pci_dev *pdev, pm_message_t state)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	pci_power_t device_state;
  
  	mpt2sas_base_stop_watchdog(ioc);
  	scsi_block_requests(shost);
  	device_state = pci_choose_state(pdev, state);
  	printk(MPT2SAS_INFO_FMT "pdev=0x%p, slot=%s, entering "
  	    "operating state [D%d]\n", ioc->name, pdev,
  	    pci_name(pdev), device_state);
  
  	mpt2sas_base_free_resources(ioc);
  	pci_save_state(pdev);
  	pci_disable_device(pdev);
  	pci_set_power_state(pdev, device_state);
  	return 0;
  }
  
  /**
   * _scsih_resume - power management resume main entry point
   * @pdev: PCI device struct
   *
   * Returns 0 success, anything else error.
   */
  static int
  _scsih_resume(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	pci_power_t device_state = pdev->current_state;
  	int r;
  
  	printk(MPT2SAS_INFO_FMT "pdev=0x%p, slot=%s, previous "
  	    "operating state [D%d]\n", ioc->name, pdev,
  	    pci_name(pdev), device_state);
  
  	pci_set_power_state(pdev, PCI_D0);
  	pci_enable_wake(pdev, PCI_D0, 0);
  	pci_restore_state(pdev);
  	ioc->pdev = pdev;
  	r = mpt2sas_base_map_resources(ioc);
  	if (r)
  		return r;
  
  	mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP, SOFT_RESET);
  	scsi_unblock_requests(shost);
  	mpt2sas_base_start_watchdog(ioc);
  	return 0;
  }
  #endif /* CONFIG_PM */
  
  /**
   * _scsih_pci_error_detected - Called when a PCI error is detected.
   * @pdev: PCI device struct
   * @state: PCI channel state
   *
   * Description: Called when a PCI error is detected.
   *
   * Return value:
   *      PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
   */
  static pci_ers_result_t
  _scsih_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  
  	printk(MPT2SAS_INFO_FMT "PCI error: detected callback, state(%d)!!\n",
  	    ioc->name, state);
  
  	switch (state) {
  	case pci_channel_io_normal:
  		return PCI_ERS_RESULT_CAN_RECOVER;
  	case pci_channel_io_frozen:
  		/* Fatal error, prepare for slot reset */
  		ioc->pci_error_recovery = 1;
  		scsi_block_requests(ioc->shost);
  		mpt2sas_base_stop_watchdog(ioc);
  		mpt2sas_base_free_resources(ioc);
  		return PCI_ERS_RESULT_NEED_RESET;
  	case pci_channel_io_perm_failure:
  		/* Permanent error, prepare for device removal */
  		ioc->pci_error_recovery = 1;
  		mpt2sas_base_stop_watchdog(ioc);
  		_scsih_flush_running_cmds(ioc);
  		return PCI_ERS_RESULT_DISCONNECT;
  	}
  	return PCI_ERS_RESULT_NEED_RESET;
  }
  
  /**
   * _scsih_pci_slot_reset - Called when PCI slot has been reset.
   * @pdev: PCI device struct
   *
   * Description: This routine is called by the pci error recovery
   * code after the PCI slot has been reset, just before we
   * should resume normal operations.
   */
  static pci_ers_result_t
  _scsih_pci_slot_reset(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  	int rc;
  
  	printk(MPT2SAS_INFO_FMT "PCI error: slot reset callback!!\n",
  		ioc->name);
  
  	ioc->pci_error_recovery = 0;
  	ioc->pdev = pdev;
  	pci_restore_state(pdev);
  	rc = mpt2sas_base_map_resources(ioc);
  	if (rc)
  		return PCI_ERS_RESULT_DISCONNECT;
  
  
  	rc = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
  	    FORCE_BIG_HAMMER);
  
  	printk(MPT2SAS_WARN_FMT "hard reset: %s\n", ioc->name,
  	    (rc == 0) ? "success" : "failed");
  
  	if (!rc)
  		return PCI_ERS_RESULT_RECOVERED;
  	else
  		return PCI_ERS_RESULT_DISCONNECT;
  }
  
  /**
   * _scsih_pci_resume() - resume normal ops after PCI reset
   * @pdev: pointer to PCI device
   *
   * Called when the error recovery driver tells us that its
   * OK to resume normal operation. Use completion to allow
   * halted scsi ops to resume.
   */
  static void
  _scsih_pci_resume(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  
  	printk(MPT2SAS_INFO_FMT "PCI error: resume callback!!\n", ioc->name);
  
  	pci_cleanup_aer_uncorrect_error_status(pdev);
  	mpt2sas_base_start_watchdog(ioc);
  	scsi_unblock_requests(ioc->shost);
  }
  
  /**
   * _scsih_pci_mmio_enabled - Enable MMIO and dump debug registers
   * @pdev: pointer to PCI device
   */
  static pci_ers_result_t
  _scsih_pci_mmio_enabled(struct pci_dev *pdev)
  {
  	struct Scsi_Host *shost = pci_get_drvdata(pdev);
  	struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
  
  	printk(MPT2SAS_INFO_FMT "PCI error: mmio enabled callback!!\n",
  	    ioc->name);
  
  	/* TODO - dump whatever for debugging purposes */
  
  	/* Request a slot reset. */
  	return PCI_ERS_RESULT_NEED_RESET;
  }
  
  static struct pci_error_handlers _scsih_err_handler = {
  	.error_detected = _scsih_pci_error_detected,
  	.mmio_enabled = _scsih_pci_mmio_enabled,
  	.slot_reset =	_scsih_pci_slot_reset,
  	.resume =	_scsih_pci_resume,
  };
  
  static struct pci_driver scsih_driver = {
  	.name		= MPT2SAS_DRIVER_NAME,
  	.id_table	= scsih_pci_table,
  	.probe		= _scsih_probe,
  	.remove		= __devexit_p(_scsih_remove),
  	.shutdown	= _scsih_shutdown,
  	.err_handler	= &_scsih_err_handler,
  #ifdef CONFIG_PM
  	.suspend	= _scsih_suspend,
  	.resume		= _scsih_resume,
  #endif
  };
  
  /* raid transport support */
  static struct raid_function_template mpt2sas_raid_functions = {
  	.cookie		= &scsih_driver_template,
  	.is_raid	= _scsih_is_raid,
  	.get_resync	= _scsih_get_resync,
  	.get_state	= _scsih_get_state,
  };
  
  /**
   * _scsih_init - main entry point for this driver.
   *
   * Returns 0 success, anything else error.
   */
  static int __init
  _scsih_init(void)
  {
  	int error;
  
  	mpt_ids = 0;
  	printk(KERN_INFO "%s version %s loaded\n", MPT2SAS_DRIVER_NAME,
  	    MPT2SAS_DRIVER_VERSION);
  
  	mpt2sas_transport_template =
  	    sas_attach_transport(&mpt2sas_transport_functions);
  	if (!mpt2sas_transport_template)
  		return -ENODEV;
  	/* raid transport support */
  	mpt2sas_raid_template = raid_class_attach(&mpt2sas_raid_functions);
  	if (!mpt2sas_raid_template) {
  		sas_release_transport(mpt2sas_transport_template);
  		return -ENODEV;
  	}
  
  	mpt2sas_base_initialize_callback_handler();
  
  	 /* queuecommand callback hander */
  	scsi_io_cb_idx = mpt2sas_base_register_callback_handler(_scsih_io_done);
  
  	/* task management callback handler */
  	tm_cb_idx = mpt2sas_base_register_callback_handler(_scsih_tm_done);
  
  	/* base internal commands callback handler */
  	base_cb_idx = mpt2sas_base_register_callback_handler(mpt2sas_base_done);
  	port_enable_cb_idx = mpt2sas_base_register_callback_handler(
  		mpt2sas_port_enable_done);
  
  	/* transport internal commands callback handler */
  	transport_cb_idx = mpt2sas_base_register_callback_handler(
  	    mpt2sas_transport_done);
  
  	/* scsih internal commands callback handler */
  	scsih_cb_idx = mpt2sas_base_register_callback_handler(_scsih_done);
  
  	/* configuration page API internal commands callback handler */
  	config_cb_idx = mpt2sas_base_register_callback_handler(
  	    mpt2sas_config_done);
  
  	/* ctl module callback handler */
  	ctl_cb_idx = mpt2sas_base_register_callback_handler(mpt2sas_ctl_done);
  
  	tm_tr_cb_idx = mpt2sas_base_register_callback_handler(
  	    _scsih_tm_tr_complete);
  
  	tm_tr_volume_cb_idx = mpt2sas_base_register_callback_handler(
  	    _scsih_tm_volume_tr_complete);
  
  	tm_sas_control_cb_idx = mpt2sas_base_register_callback_handler(
  	    _scsih_sas_control_complete);
  
  	mpt2sas_ctl_init();
  
  	error = pci_register_driver(&scsih_driver);
  	if (error) {
  		/* raid transport support */
  		raid_class_release(mpt2sas_raid_template);
  		sas_release_transport(mpt2sas_transport_template);
  	}
  
  	return error;
  }
  
  /**
   * _scsih_exit - exit point for this driver (when it is a module).
   *
   * Returns 0 success, anything else error.
   */
  static void __exit
  _scsih_exit(void)
  {
  	printk(KERN_INFO "mpt2sas version %s unloading\n",
  	    MPT2SAS_DRIVER_VERSION);
  
  	pci_unregister_driver(&scsih_driver);
  
  	mpt2sas_ctl_exit();
  
  	mpt2sas_base_release_callback_handler(scsi_io_cb_idx);
  	mpt2sas_base_release_callback_handler(tm_cb_idx);
  	mpt2sas_base_release_callback_handler(base_cb_idx);
  	mpt2sas_base_release_callback_handler(port_enable_cb_idx);
  	mpt2sas_base_release_callback_handler(transport_cb_idx);
  	mpt2sas_base_release_callback_handler(scsih_cb_idx);
  	mpt2sas_base_release_callback_handler(config_cb_idx);
  	mpt2sas_base_release_callback_handler(ctl_cb_idx);
  
  	mpt2sas_base_release_callback_handler(tm_tr_cb_idx);
  	mpt2sas_base_release_callback_handler(tm_tr_volume_cb_idx);
  	mpt2sas_base_release_callback_handler(tm_sas_control_cb_idx);
  
  	/* raid transport support */
  	raid_class_release(mpt2sas_raid_template);
  	sas_release_transport(mpt2sas_transport_template);
  
  }
  
  module_init(_scsih_init);
  module_exit(_scsih_exit);
  