text: /*
   *    driver for Microsemi PQI-based storage controllers
   *    Copyright (c) 2016-2017 Microsemi Corporation
   *    Copyright (c) 2016 PMC-Sierra, Inc.
   *
   *    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; version 2 of the License.
   *
   *    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, GOOD TITLE or
   *    NON INFRINGEMENT.  See the GNU General Public License for more details.
   *
   *    Questions/Comments/Bugfixes to esc.storagedev@microsemi.com
   *
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/pci.h>
  #include <linux/delay.h>
  #include <linux/interrupt.h>
  #include <linux/sched.h>
  #include <linux/rtc.h>
  #include <linux/bcd.h>
  #include <linux/reboot.h>
  #include <linux/cciss_ioctl.h>
  #include <linux/blk-mq-pci.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_eh.h>
  #include <scsi/scsi_transport_sas.h>
  #include <asm/unaligned.h>
  #include "smartpqi.h"
  #include "smartpqi_sis.h"
  
  #if !defined(BUILD_TIMESTAMP)
  #define BUILD_TIMESTAMP
  #endif
  
  #define DRIVER_VERSION		"1.1.4-115"
  #define DRIVER_MAJOR		1
  #define DRIVER_MINOR		1
  #define DRIVER_RELEASE		4
  #define DRIVER_REVISION		115
  
  #define DRIVER_NAME		"Microsemi PQI Driver (v" \
  				DRIVER_VERSION BUILD_TIMESTAMP ")"
  #define DRIVER_NAME_SHORT	"smartpqi"
  
  #define PQI_EXTRA_SGL_MEMORY	(12 * sizeof(struct pqi_sg_descriptor))
  
  MODULE_AUTHOR("Microsemi");
  MODULE_DESCRIPTION("Driver for Microsemi Smart Family Controller version "
  	DRIVER_VERSION);
  MODULE_SUPPORTED_DEVICE("Microsemi Smart Family Controllers");
  MODULE_VERSION(DRIVER_VERSION);
  MODULE_LICENSE("GPL");
  
  static void pqi_take_ctrl_offline(struct pqi_ctrl_info *ctrl_info);
  static void pqi_ctrl_offline_worker(struct work_struct *work);
  static void pqi_retry_raid_bypass_requests(struct pqi_ctrl_info *ctrl_info);
  static int pqi_scan_scsi_devices(struct pqi_ctrl_info *ctrl_info);
  static void pqi_scan_start(struct Scsi_Host *shost);
  static void pqi_start_io(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_queue_group *queue_group, enum pqi_io_path path,
  	struct pqi_io_request *io_request);
  static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_iu_header *request, unsigned int flags,
  	struct pqi_raid_error_info *error_info, unsigned long timeout_msecs);
  static int pqi_aio_submit_io(struct pqi_ctrl_info *ctrl_info,
  	struct scsi_cmnd *scmd, u32 aio_handle, u8 *cdb,
  	unsigned int cdb_length, struct pqi_queue_group *queue_group,
  	struct pqi_encryption_info *encryption_info, bool raid_bypass);
  
  /* for flags argument to pqi_submit_raid_request_synchronous() */
  #define PQI_SYNC_FLAGS_INTERRUPTABLE	0x1
  
  static struct scsi_transport_template *pqi_sas_transport_template;
  
  static atomic_t pqi_controller_count = ATOMIC_INIT(0);
  
  enum pqi_lockup_action {
  	NONE,
  	REBOOT,
  	PANIC
  };
  
  static enum pqi_lockup_action pqi_lockup_action = NONE;
  
  static struct {
  	enum pqi_lockup_action	action;
  	char			*name;
  } pqi_lockup_actions[] = {
  	{
  		.action = NONE,
  		.name = "none",
  	},
  	{
  		.action = REBOOT,
  		.name = "reboot",
  	},
  	{
  		.action = PANIC,
  		.name = "panic",
  	},
  };
  
  static unsigned int pqi_supported_event_types[] = {
  	PQI_EVENT_TYPE_HOTPLUG,
  	PQI_EVENT_TYPE_HARDWARE,
  	PQI_EVENT_TYPE_PHYSICAL_DEVICE,
  	PQI_EVENT_TYPE_LOGICAL_DEVICE,
  	PQI_EVENT_TYPE_AIO_STATE_CHANGE,
  	PQI_EVENT_TYPE_AIO_CONFIG_CHANGE,
  };
  
  static int pqi_disable_device_id_wildcards;
  module_param_named(disable_device_id_wildcards,
  	pqi_disable_device_id_wildcards, int, 0644);
  MODULE_PARM_DESC(disable_device_id_wildcards,
  	"Disable device ID wildcards.");
  
  static int pqi_disable_heartbeat;
  module_param_named(disable_heartbeat,
  	pqi_disable_heartbeat, int, 0644);
  MODULE_PARM_DESC(disable_heartbeat,
  	"Disable heartbeat.");
  
  static int pqi_disable_ctrl_shutdown;
  module_param_named(disable_ctrl_shutdown,
  	pqi_disable_ctrl_shutdown, int, 0644);
  MODULE_PARM_DESC(disable_ctrl_shutdown,
  	"Disable controller shutdown when controller locked up.");
  
  static char *pqi_lockup_action_param;
  module_param_named(lockup_action,
  	pqi_lockup_action_param, charp, 0644);
  MODULE_PARM_DESC(lockup_action, "Action to take when controller locked up.\n"
  	"\t\tSupported: none, reboot, panic\n"
  	"\t\tDefault: none");
  
  static char *raid_levels[] = {
  	"RAID-0",
  	"RAID-4",
  	"RAID-1(1+0)",
  	"RAID-5",
  	"RAID-5+1",
  	"RAID-ADG",
  	"RAID-1(ADM)",
  };
  
  static char *pqi_raid_level_to_string(u8 raid_level)
  {
  	if (raid_level < ARRAY_SIZE(raid_levels))
  		return raid_levels[raid_level];
  
  	return "RAID UNKNOWN";
  }
  
  #define SA_RAID_0		0
  #define SA_RAID_4		1
  #define SA_RAID_1		2	/* also used for RAID 10 */
  #define SA_RAID_5		3	/* also used for RAID 50 */
  #define SA_RAID_51		4
  #define SA_RAID_6		5	/* also used for RAID 60 */
  #define SA_RAID_ADM		6	/* also used for RAID 1+0 ADM */
  #define SA_RAID_MAX		SA_RAID_ADM
  #define SA_RAID_UNKNOWN		0xff
  
  static inline void pqi_scsi_done(struct scsi_cmnd *scmd)
  {
  	pqi_prep_for_scsi_done(scmd);
  	scmd->scsi_done(scmd);
  }
  
  static inline bool pqi_scsi3addr_equal(u8 *scsi3addr1, u8 *scsi3addr2)
  {
  	return memcmp(scsi3addr1, scsi3addr2, 8) == 0;
  }
  
  static inline struct pqi_ctrl_info *shost_to_hba(struct Scsi_Host *shost)
  {
  	void *hostdata = shost_priv(shost);
  
  	return *((struct pqi_ctrl_info **)hostdata);
  }
  
  static inline bool pqi_is_logical_device(struct pqi_scsi_dev *device)
  {
  	return !device->is_physical_device;
  }
  
  static inline bool pqi_is_external_raid_addr(u8 *scsi3addr)
  {
  	return scsi3addr[2] != 0;
  }
  
  static inline bool pqi_ctrl_offline(struct pqi_ctrl_info *ctrl_info)
  {
  	return !ctrl_info->controller_online;
  }
  
  static inline void pqi_check_ctrl_health(struct pqi_ctrl_info *ctrl_info)
  {
  	if (ctrl_info->controller_online)
  		if (!sis_is_firmware_running(ctrl_info))
  			pqi_take_ctrl_offline(ctrl_info);
  }
  
  static inline bool pqi_is_hba_lunid(u8 *scsi3addr)
  {
  	return pqi_scsi3addr_equal(scsi3addr, RAID_CTLR_LUNID);
  }
  
  static inline enum pqi_ctrl_mode pqi_get_ctrl_mode(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	return sis_read_driver_scratch(ctrl_info);
  }
  
  static inline void pqi_save_ctrl_mode(struct pqi_ctrl_info *ctrl_info,
  	enum pqi_ctrl_mode mode)
  {
  	sis_write_driver_scratch(ctrl_info, mode);
  }
  
  static inline void pqi_ctrl_block_requests(struct pqi_ctrl_info *ctrl_info)
  {
  	ctrl_info->block_requests = true;
  	scsi_block_requests(ctrl_info->scsi_host);
  }
  
  static inline void pqi_ctrl_unblock_requests(struct pqi_ctrl_info *ctrl_info)
  {
  	ctrl_info->block_requests = false;
  	wake_up_all(&ctrl_info->block_requests_wait);
  	pqi_retry_raid_bypass_requests(ctrl_info);
  	scsi_unblock_requests(ctrl_info->scsi_host);
  }
  
  static inline bool pqi_ctrl_blocked(struct pqi_ctrl_info *ctrl_info)
  {
  	return ctrl_info->block_requests;
  }
  
  static unsigned long pqi_wait_if_ctrl_blocked(struct pqi_ctrl_info *ctrl_info,
  	unsigned long timeout_msecs)
  {
  	unsigned long remaining_msecs;
  
  	if (!pqi_ctrl_blocked(ctrl_info))
  		return timeout_msecs;
  
  	atomic_inc(&ctrl_info->num_blocked_threads);
  
  	if (timeout_msecs == NO_TIMEOUT) {
  		wait_event(ctrl_info->block_requests_wait,
  			!pqi_ctrl_blocked(ctrl_info));
  		remaining_msecs = timeout_msecs;
  	} else {
  		unsigned long remaining_jiffies;
  
  		remaining_jiffies =
  			wait_event_timeout(ctrl_info->block_requests_wait,
  				!pqi_ctrl_blocked(ctrl_info),
  				msecs_to_jiffies(timeout_msecs));
  		remaining_msecs = jiffies_to_msecs(remaining_jiffies);
  	}
  
  	atomic_dec(&ctrl_info->num_blocked_threads);
  
  	return remaining_msecs;
  }
  
  static inline void pqi_ctrl_busy(struct pqi_ctrl_info *ctrl_info)
  {
  	atomic_inc(&ctrl_info->num_busy_threads);
  }
  
  static inline void pqi_ctrl_unbusy(struct pqi_ctrl_info *ctrl_info)
  {
  	atomic_dec(&ctrl_info->num_busy_threads);
  }
  
  static inline void pqi_ctrl_wait_until_quiesced(struct pqi_ctrl_info *ctrl_info)
  {
  	while (atomic_read(&ctrl_info->num_busy_threads) >
  		atomic_read(&ctrl_info->num_blocked_threads))
  		usleep_range(1000, 2000);
  }
  
  static inline bool pqi_device_offline(struct pqi_scsi_dev *device)
  {
  	return device->device_offline;
  }
  
  static inline void pqi_device_reset_start(struct pqi_scsi_dev *device)
  {
  	device->in_reset = true;
  }
  
  static inline void pqi_device_reset_done(struct pqi_scsi_dev *device)
  {
  	device->in_reset = false;
  }
  
  static inline bool pqi_device_in_reset(struct pqi_scsi_dev *device)
  {
  	return device->in_reset;
  }
  
  static inline void pqi_schedule_rescan_worker_with_delay(
  	struct pqi_ctrl_info *ctrl_info, unsigned long delay)
  {
  	if (pqi_ctrl_offline(ctrl_info))
  		return;
  
  	schedule_delayed_work(&ctrl_info->rescan_work, delay);
  }
  
  static inline void pqi_schedule_rescan_worker(struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_schedule_rescan_worker_with_delay(ctrl_info, 0);
  }
  
  #define PQI_RESCAN_WORK_DELAY  (10 * HZ)
  
  static inline void pqi_schedule_rescan_worker_delayed(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_schedule_rescan_worker_with_delay(ctrl_info, PQI_RESCAN_WORK_DELAY);
  }
  
  static inline void pqi_cancel_rescan_worker(struct pqi_ctrl_info *ctrl_info)
  {
  	cancel_delayed_work_sync(&ctrl_info->rescan_work);
  }
  
  static inline u32 pqi_read_heartbeat_counter(struct pqi_ctrl_info *ctrl_info)
  {
  	if (!ctrl_info->heartbeat_counter)
  		return 0;
  
  	return readl(ctrl_info->heartbeat_counter);
  }
  
  static int pqi_map_single(struct pci_dev *pci_dev,
  	struct pqi_sg_descriptor *sg_descriptor, void *buffer,
  	size_t buffer_length, int data_direction)
  {
  	dma_addr_t bus_address;
  
  	if (!buffer || buffer_length == 0 || data_direction == PCI_DMA_NONE)
  		return 0;
  
  	bus_address = pci_map_single(pci_dev, buffer, buffer_length,
  		data_direction);
  	if (pci_dma_mapping_error(pci_dev, bus_address))
  		return -ENOMEM;
  
  	put_unaligned_le64((u64)bus_address, &sg_descriptor->address);
  	put_unaligned_le32(buffer_length, &sg_descriptor->length);
  	put_unaligned_le32(CISS_SG_LAST, &sg_descriptor->flags);
  
  	return 0;
  }
  
  static void pqi_pci_unmap(struct pci_dev *pci_dev,
  	struct pqi_sg_descriptor *descriptors, int num_descriptors,
  	int data_direction)
  {
  	int i;
  
  	if (data_direction == PCI_DMA_NONE)
  		return;
  
  	for (i = 0; i < num_descriptors; i++)
  		pci_unmap_single(pci_dev,
  			(dma_addr_t)get_unaligned_le64(&descriptors[i].address),
  			get_unaligned_le32(&descriptors[i].length),
  			data_direction);
  }
  
  static int pqi_build_raid_path_request(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_raid_path_request *request, u8 cmd,
  	u8 *scsi3addr, void *buffer, size_t buffer_length,
  	u16 vpd_page, int *pci_direction)
  {
  	u8 *cdb;
  	int pci_dir;
  
  	memset(request, 0, sizeof(*request));
  
  	request->header.iu_type = PQI_REQUEST_IU_RAID_PATH_IO;
  	put_unaligned_le16(offsetof(struct pqi_raid_path_request,
  		sg_descriptors[1]) - PQI_REQUEST_HEADER_LENGTH,
  		&request->header.iu_length);
  	put_unaligned_le32(buffer_length, &request->buffer_length);
  	memcpy(request->lun_number, scsi3addr, sizeof(request->lun_number));
  	request->task_attribute = SOP_TASK_ATTRIBUTE_SIMPLE;
  	request->additional_cdb_bytes_usage = SOP_ADDITIONAL_CDB_BYTES_0;
  
  	cdb = request->cdb;
  
  	switch (cmd) {
  	case INQUIRY:
  		request->data_direction = SOP_READ_FLAG;
  		cdb[0] = INQUIRY;
  		if (vpd_page & VPD_PAGE) {
  			cdb[1] = 0x1;
  			cdb[2] = (u8)vpd_page;
  		}
  		cdb[4] = (u8)buffer_length;
  		break;
  	case CISS_REPORT_LOG:
  	case CISS_REPORT_PHYS:
  		request->data_direction = SOP_READ_FLAG;
  		cdb[0] = cmd;
  		if (cmd == CISS_REPORT_PHYS)
  			cdb[1] = CISS_REPORT_PHYS_EXTENDED;
  		else
  			cdb[1] = CISS_REPORT_LOG_EXTENDED;
  		put_unaligned_be32(buffer_length, &cdb[6]);
  		break;
  	case CISS_GET_RAID_MAP:
  		request->data_direction = SOP_READ_FLAG;
  		cdb[0] = CISS_READ;
  		cdb[1] = CISS_GET_RAID_MAP;
  		put_unaligned_be32(buffer_length, &cdb[6]);
  		break;
  	case SA_FLUSH_CACHE:
  		request->data_direction = SOP_WRITE_FLAG;
  		cdb[0] = BMIC_WRITE;
  		cdb[6] = BMIC_FLUSH_CACHE;
  		put_unaligned_be16(buffer_length, &cdb[7]);
  		break;
  	case BMIC_IDENTIFY_CONTROLLER:
  	case BMIC_IDENTIFY_PHYSICAL_DEVICE:
  		request->data_direction = SOP_READ_FLAG;
  		cdb[0] = BMIC_READ;
  		cdb[6] = cmd;
  		put_unaligned_be16(buffer_length, &cdb[7]);
  		break;
  	case BMIC_WRITE_HOST_WELLNESS:
  		request->data_direction = SOP_WRITE_FLAG;
  		cdb[0] = BMIC_WRITE;
  		cdb[6] = cmd;
  		put_unaligned_be16(buffer_length, &cdb[7]);
  		break;
  	default:
  		dev_err(&ctrl_info->pci_dev->dev, "unknown command 0x%c\n",
  			cmd);
  		break;
  	}
  
  	switch (request->data_direction) {
  	case SOP_READ_FLAG:
  		pci_dir = PCI_DMA_FROMDEVICE;
  		break;
  	case SOP_WRITE_FLAG:
  		pci_dir = PCI_DMA_TODEVICE;
  		break;
  	case SOP_NO_DIRECTION_FLAG:
  		pci_dir = PCI_DMA_NONE;
  		break;
  	default:
  		pci_dir = PCI_DMA_BIDIRECTIONAL;
  		break;
  	}
  
  	*pci_direction = pci_dir;
  
  	return pqi_map_single(ctrl_info->pci_dev, &request->sg_descriptors[0],
  		buffer, buffer_length, pci_dir);
  }
  
  static inline void pqi_reinit_io_request(struct pqi_io_request *io_request)
  {
  	io_request->scmd = NULL;
  	io_request->status = 0;
  	io_request->error_info = NULL;
  	io_request->raid_bypass = false;
  }
  
  static struct pqi_io_request *pqi_alloc_io_request(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	struct pqi_io_request *io_request;
  	u16 i = ctrl_info->next_io_request_slot;	/* benignly racy */
  
  	while (1) {
  		io_request = &ctrl_info->io_request_pool[i];
  		if (atomic_inc_return(&io_request->refcount) == 1)
  			break;
  		atomic_dec(&io_request->refcount);
  		i = (i + 1) % ctrl_info->max_io_slots;
  	}
  
  	/* benignly racy */
  	ctrl_info->next_io_request_slot = (i + 1) % ctrl_info->max_io_slots;
  
  	pqi_reinit_io_request(io_request);
  
  	return io_request;
  }
  
  static void pqi_free_io_request(struct pqi_io_request *io_request)
  {
  	atomic_dec(&io_request->refcount);
  }
  
  static int pqi_identify_controller(struct pqi_ctrl_info *ctrl_info,
  	struct bmic_identify_controller *buffer)
  {
  	int rc;
  	int pci_direction;
  	struct pqi_raid_path_request request;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		BMIC_IDENTIFY_CONTROLLER, RAID_CTLR_LUNID, buffer,
  		sizeof(*buffer), 0, &pci_direction);
  	if (rc)
  		return rc;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0,
  		NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	return rc;
  }
  
  static int pqi_scsi_inquiry(struct pqi_ctrl_info *ctrl_info,
  	u8 *scsi3addr, u16 vpd_page, void *buffer, size_t buffer_length)
  {
  	int rc;
  	int pci_direction;
  	struct pqi_raid_path_request request;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		INQUIRY, scsi3addr, buffer, buffer_length, vpd_page,
  		&pci_direction);
  	if (rc)
  		return rc;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0,
  		NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	return rc;
  }
  
  static int pqi_identify_physical_device(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device,
  	struct bmic_identify_physical_device *buffer,
  	size_t buffer_length)
  {
  	int rc;
  	int pci_direction;
  	u16 bmic_device_index;
  	struct pqi_raid_path_request request;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		BMIC_IDENTIFY_PHYSICAL_DEVICE, RAID_CTLR_LUNID, buffer,
  		buffer_length, 0, &pci_direction);
  	if (rc)
  		return rc;
  
  	bmic_device_index = CISS_GET_DRIVE_NUMBER(device->scsi3addr);
  	request.cdb[2] = (u8)bmic_device_index;
  	request.cdb[9] = (u8)(bmic_device_index >> 8);
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header,
  		0, NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	return rc;
  }
  
  static int pqi_flush_cache(struct pqi_ctrl_info *ctrl_info,
  	enum bmic_flush_cache_shutdown_event shutdown_event)
  {
  	int rc;
  	struct pqi_raid_path_request request;
  	int pci_direction;
  	struct bmic_flush_cache *flush_cache;
  
  	/*
  	 * Don't bother trying to flush the cache if the controller is
  	 * locked up.
  	 */
  	if (pqi_ctrl_offline(ctrl_info))
  		return -ENXIO;
  
  	flush_cache = kzalloc(sizeof(*flush_cache), GFP_KERNEL);
  	if (!flush_cache)
  		return -ENOMEM;
  
  	flush_cache->shutdown_event = shutdown_event;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		SA_FLUSH_CACHE, RAID_CTLR_LUNID, flush_cache,
  		sizeof(*flush_cache), 0, &pci_direction);
  	if (rc)
  		goto out;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header,
  		0, NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  out:
  	kfree(flush_cache);
  
  	return rc;
  }
  
  static int pqi_write_host_wellness(struct pqi_ctrl_info *ctrl_info,
  	void *buffer, size_t buffer_length)
  {
  	int rc;
  	struct pqi_raid_path_request request;
  	int pci_direction;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		BMIC_WRITE_HOST_WELLNESS, RAID_CTLR_LUNID, buffer,
  		buffer_length, 0, &pci_direction);
  	if (rc)
  		return rc;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header,
  		0, NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	return rc;
  }
  
  #pragma pack(1)
  
  struct bmic_host_wellness_driver_version {
  	u8	start_tag[4];
  	u8	driver_version_tag[2];
  	__le16	driver_version_length;
  	char	driver_version[32];
  	u8	end_tag[2];
  };
  
  #pragma pack()
  
  static int pqi_write_driver_version_to_host_wellness(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct bmic_host_wellness_driver_version *buffer;
  	size_t buffer_length;
  
  	buffer_length = sizeof(*buffer);
  
  	buffer = kmalloc(buffer_length, GFP_KERNEL);
  	if (!buffer)
  		return -ENOMEM;
  
  	buffer->start_tag[0] = '<';
  	buffer->start_tag[1] = 'H';
  	buffer->start_tag[2] = 'W';
  	buffer->start_tag[3] = '>';
  	buffer->driver_version_tag[0] = 'D';
  	buffer->driver_version_tag[1] = 'V';
  	put_unaligned_le16(sizeof(buffer->driver_version),
  		&buffer->driver_version_length);
  	strncpy(buffer->driver_version, "Linux " DRIVER_VERSION,
  		sizeof(buffer->driver_version) - 1);
  	buffer->driver_version[sizeof(buffer->driver_version) - 1] = '\0';
  	buffer->end_tag[0] = 'Z';
  	buffer->end_tag[1] = 'Z';
  
  	rc = pqi_write_host_wellness(ctrl_info, buffer, buffer_length);
  
  	kfree(buffer);
  
  	return rc;
  }
  
  #pragma pack(1)
  
  struct bmic_host_wellness_time {
  	u8	start_tag[4];
  	u8	time_tag[2];
  	__le16	time_length;
  	u8	time[8];
  	u8	dont_write_tag[2];
  	u8	end_tag[2];
  };
  
  #pragma pack()
  
  static int pqi_write_current_time_to_host_wellness(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct bmic_host_wellness_time *buffer;
  	size_t buffer_length;
  	time64_t local_time;
  	unsigned int year;
  	struct tm tm;
  
  	buffer_length = sizeof(*buffer);
  
  	buffer = kmalloc(buffer_length, GFP_KERNEL);
  	if (!buffer)
  		return -ENOMEM;
  
  	buffer->start_tag[0] = '<';
  	buffer->start_tag[1] = 'H';
  	buffer->start_tag[2] = 'W';
  	buffer->start_tag[3] = '>';
  	buffer->time_tag[0] = 'T';
  	buffer->time_tag[1] = 'D';
  	put_unaligned_le16(sizeof(buffer->time),
  		&buffer->time_length);
  
  	local_time = ktime_get_real_seconds();
  	time64_to_tm(local_time, -sys_tz.tz_minuteswest * 60, &tm);
  	year = tm.tm_year + 1900;
  
  	buffer->time[0] = bin2bcd(tm.tm_hour);
  	buffer->time[1] = bin2bcd(tm.tm_min);
  	buffer->time[2] = bin2bcd(tm.tm_sec);
  	buffer->time[3] = 0;
  	buffer->time[4] = bin2bcd(tm.tm_mon + 1);
  	buffer->time[5] = bin2bcd(tm.tm_mday);
  	buffer->time[6] = bin2bcd(year / 100);
  	buffer->time[7] = bin2bcd(year % 100);
  
  	buffer->dont_write_tag[0] = 'D';
  	buffer->dont_write_tag[1] = 'W';
  	buffer->end_tag[0] = 'Z';
  	buffer->end_tag[1] = 'Z';
  
  	rc = pqi_write_host_wellness(ctrl_info, buffer, buffer_length);
  
  	kfree(buffer);
  
  	return rc;
  }
  
  #define PQI_UPDATE_TIME_WORK_INTERVAL	(24UL * 60 * 60 * HZ)
  
  static void pqi_update_time_worker(struct work_struct *work)
  {
  	int rc;
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = container_of(to_delayed_work(work), struct pqi_ctrl_info,
  		update_time_work);
  
  	if (pqi_ctrl_offline(ctrl_info))
  		return;
  
  	rc = pqi_write_current_time_to_host_wellness(ctrl_info);
  	if (rc)
  		dev_warn(&ctrl_info->pci_dev->dev,
  			"error updating time on controller\n");
  
  	schedule_delayed_work(&ctrl_info->update_time_work,
  		PQI_UPDATE_TIME_WORK_INTERVAL);
  }
  
  static inline void pqi_schedule_update_time_worker(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	schedule_delayed_work(&ctrl_info->update_time_work, 0);
  }
  
  static inline void pqi_cancel_update_time_worker(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	cancel_delayed_work_sync(&ctrl_info->update_time_work);
  }
  
  static int pqi_report_luns(struct pqi_ctrl_info *ctrl_info, u8 cmd,
  	void *buffer, size_t buffer_length)
  {
  	int rc;
  	int pci_direction;
  	struct pqi_raid_path_request request;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		cmd, RAID_CTLR_LUNID, buffer, buffer_length, 0, &pci_direction);
  	if (rc)
  		return rc;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0,
  		NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	return rc;
  }
  
  static int pqi_report_phys_logical_luns(struct pqi_ctrl_info *ctrl_info, u8 cmd,
  	void **buffer)
  {
  	int rc;
  	size_t lun_list_length;
  	size_t lun_data_length;
  	size_t new_lun_list_length;
  	void *lun_data = NULL;
  	struct report_lun_header *report_lun_header;
  
  	report_lun_header = kmalloc(sizeof(*report_lun_header), GFP_KERNEL);
  	if (!report_lun_header) {
  		rc = -ENOMEM;
  		goto out;
  	}
  
  	rc = pqi_report_luns(ctrl_info, cmd, report_lun_header,
  		sizeof(*report_lun_header));
  	if (rc)
  		goto out;
  
  	lun_list_length = get_unaligned_be32(&report_lun_header->list_length);
  
  again:
  	lun_data_length = sizeof(struct report_lun_header) + lun_list_length;
  
  	lun_data = kmalloc(lun_data_length, GFP_KERNEL);
  	if (!lun_data) {
  		rc = -ENOMEM;
  		goto out;
  	}
  
  	if (lun_list_length == 0) {
  		memcpy(lun_data, report_lun_header, sizeof(*report_lun_header));
  		goto out;
  	}
  
  	rc = pqi_report_luns(ctrl_info, cmd, lun_data, lun_data_length);
  	if (rc)
  		goto out;
  
  	new_lun_list_length = get_unaligned_be32(
  		&((struct report_lun_header *)lun_data)->list_length);
  
  	if (new_lun_list_length > lun_list_length) {
  		lun_list_length = new_lun_list_length;
  		kfree(lun_data);
  		goto again;
  	}
  
  out:
  	kfree(report_lun_header);
  
  	if (rc) {
  		kfree(lun_data);
  		lun_data = NULL;
  	}
  
  	*buffer = lun_data;
  
  	return rc;
  }
  
  static inline int pqi_report_phys_luns(struct pqi_ctrl_info *ctrl_info,
  	void **buffer)
  {
  	return pqi_report_phys_logical_luns(ctrl_info, CISS_REPORT_PHYS,
  		buffer);
  }
  
  static inline int pqi_report_logical_luns(struct pqi_ctrl_info *ctrl_info,
  	void **buffer)
  {
  	return pqi_report_phys_logical_luns(ctrl_info, CISS_REPORT_LOG, buffer);
  }
  
  static int pqi_get_device_lists(struct pqi_ctrl_info *ctrl_info,
  	struct report_phys_lun_extended **physdev_list,
  	struct report_log_lun_extended **logdev_list)
  {
  	int rc;
  	size_t logdev_list_length;
  	size_t logdev_data_length;
  	struct report_log_lun_extended *internal_logdev_list;
  	struct report_log_lun_extended *logdev_data;
  	struct report_lun_header report_lun_header;
  
  	rc = pqi_report_phys_luns(ctrl_info, (void **)physdev_list);
  	if (rc)
  		dev_err(&ctrl_info->pci_dev->dev,
  			"report physical LUNs failed\n");
  
  	rc = pqi_report_logical_luns(ctrl_info, (void **)logdev_list);
  	if (rc)
  		dev_err(&ctrl_info->pci_dev->dev,
  			"report logical LUNs failed\n");
  
  	/*
  	 * Tack the controller itself onto the end of the logical device list.
  	 */
  
  	logdev_data = *logdev_list;
  
  	if (logdev_data) {
  		logdev_list_length =
  			get_unaligned_be32(&logdev_data->header.list_length);
  	} else {
  		memset(&report_lun_header, 0, sizeof(report_lun_header));
  		logdev_data =
  			(struct report_log_lun_extended *)&report_lun_header;
  		logdev_list_length = 0;
  	}
  
  	logdev_data_length = sizeof(struct report_lun_header) +
  		logdev_list_length;
  
  	internal_logdev_list = kmalloc(logdev_data_length +
  		sizeof(struct report_log_lun_extended), GFP_KERNEL);
  	if (!internal_logdev_list) {
  		kfree(*logdev_list);
  		*logdev_list = NULL;
  		return -ENOMEM;
  	}
  
  	memcpy(internal_logdev_list, logdev_data, logdev_data_length);
  	memset((u8 *)internal_logdev_list + logdev_data_length, 0,
  		sizeof(struct report_log_lun_extended_entry));
  	put_unaligned_be32(logdev_list_length +
  		sizeof(struct report_log_lun_extended_entry),
  		&internal_logdev_list->header.list_length);
  
  	kfree(*logdev_list);
  	*logdev_list = internal_logdev_list;
  
  	return 0;
  }
  
  static inline void pqi_set_bus_target_lun(struct pqi_scsi_dev *device,
  	int bus, int target, int lun)
  {
  	device->bus = bus;
  	device->target = target;
  	device->lun = lun;
  }
  
  static void pqi_assign_bus_target_lun(struct pqi_scsi_dev *device)
  {
  	u8 *scsi3addr;
  	u32 lunid;
  	int bus;
  	int target;
  	int lun;
  
  	scsi3addr = device->scsi3addr;
  	lunid = get_unaligned_le32(scsi3addr);
  
  	if (pqi_is_hba_lunid(scsi3addr)) {
  		/* The specified device is the controller. */
  		pqi_set_bus_target_lun(device, PQI_HBA_BUS, 0, lunid & 0x3fff);
  		device->target_lun_valid = true;
  		return;
  	}
  
  	if (pqi_is_logical_device(device)) {
  		if (device->is_external_raid_device) {
  			bus = PQI_EXTERNAL_RAID_VOLUME_BUS;
  			target = (lunid >> 16) & 0x3fff;
  			lun = lunid & 0xff;
  		} else {
  			bus = PQI_RAID_VOLUME_BUS;
  			target = 0;
  			lun = lunid & 0x3fff;
  		}
  		pqi_set_bus_target_lun(device, bus, target, lun);
  		device->target_lun_valid = true;
  		return;
  	}
  
  	/*
  	 * Defer target and LUN assignment for non-controller physical devices
  	 * because the SAS transport layer will make these assignments later.
  	 */
  	pqi_set_bus_target_lun(device, PQI_PHYSICAL_DEVICE_BUS, 0, 0);
  }
  
  static void pqi_get_raid_level(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	u8 raid_level;
  	u8 *buffer;
  
  	raid_level = SA_RAID_UNKNOWN;
  
  	buffer = kmalloc(64, GFP_KERNEL);
  	if (buffer) {
  		rc = pqi_scsi_inquiry(ctrl_info, device->scsi3addr,
  			VPD_PAGE | CISS_VPD_LV_DEVICE_GEOMETRY, buffer, 64);
  		if (rc == 0) {
  			raid_level = buffer[8];
  			if (raid_level > SA_RAID_MAX)
  				raid_level = SA_RAID_UNKNOWN;
  		}
  		kfree(buffer);
  	}
  
  	device->raid_level = raid_level;
  }
  
  static int pqi_validate_raid_map(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device, struct raid_map *raid_map)
  {
  	char *err_msg;
  	u32 raid_map_size;
  	u32 r5or6_blocks_per_row;
  	unsigned int num_phys_disks;
  	unsigned int num_raid_map_entries;
  
  	raid_map_size = get_unaligned_le32(&raid_map->structure_size);
  
  	if (raid_map_size < offsetof(struct raid_map, disk_data)) {
  		err_msg = "RAID map too small";
  		goto bad_raid_map;
  	}
  
  	if (raid_map_size > sizeof(*raid_map)) {
  		err_msg = "RAID map too large";
  		goto bad_raid_map;
  	}
  
  	num_phys_disks = get_unaligned_le16(&raid_map->layout_map_count) *
  		(get_unaligned_le16(&raid_map->data_disks_per_row) +
  		get_unaligned_le16(&raid_map->metadata_disks_per_row));
  	num_raid_map_entries = num_phys_disks *
  		get_unaligned_le16(&raid_map->row_cnt);
  
  	if (num_raid_map_entries > RAID_MAP_MAX_ENTRIES) {
  		err_msg = "invalid number of map entries in RAID map";
  		goto bad_raid_map;
  	}
  
  	if (device->raid_level == SA_RAID_1) {
  		if (get_unaligned_le16(&raid_map->layout_map_count) != 2) {
  			err_msg = "invalid RAID-1 map";
  			goto bad_raid_map;
  		}
  	} else if (device->raid_level == SA_RAID_ADM) {
  		if (get_unaligned_le16(&raid_map->layout_map_count) != 3) {
  			err_msg = "invalid RAID-1(ADM) map";
  			goto bad_raid_map;
  		}
  	} else if ((device->raid_level == SA_RAID_5 ||
  		device->raid_level == SA_RAID_6) &&
  		get_unaligned_le16(&raid_map->layout_map_count) > 1) {
  		/* RAID 50/60 */
  		r5or6_blocks_per_row =
  			get_unaligned_le16(&raid_map->strip_size) *
  			get_unaligned_le16(&raid_map->data_disks_per_row);
  		if (r5or6_blocks_per_row == 0) {
  			err_msg = "invalid RAID-5 or RAID-6 map";
  			goto bad_raid_map;
  		}
  	}
  
  	return 0;
  
  bad_raid_map:
  	dev_warn(&ctrl_info->pci_dev->dev,
  		"logical device %08x%08x %s\n",
  		*((u32 *)&device->scsi3addr),
  		*((u32 *)&device->scsi3addr[4]), err_msg);
  
  	return -EINVAL;
  }
  
  static int pqi_get_raid_map(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	int pci_direction;
  	struct pqi_raid_path_request request;
  	struct raid_map *raid_map;
  
  	raid_map = kmalloc(sizeof(*raid_map), GFP_KERNEL);
  	if (!raid_map)
  		return -ENOMEM;
  
  	rc = pqi_build_raid_path_request(ctrl_info, &request,
  		CISS_GET_RAID_MAP, device->scsi3addr, raid_map,
  		sizeof(*raid_map), 0, &pci_direction);
  	if (rc)
  		goto error;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0,
  		NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  		pci_direction);
  
  	if (rc)
  		goto error;
  
  	rc = pqi_validate_raid_map(ctrl_info, device, raid_map);
  	if (rc)
  		goto error;
  
  	device->raid_map = raid_map;
  
  	return 0;
  
  error:
  	kfree(raid_map);
  
  	return rc;
  }
  
  static void pqi_get_raid_bypass_status(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	u8 *buffer;
  	u8 bypass_status;
  
  	buffer = kmalloc(64, GFP_KERNEL);
  	if (!buffer)
  		return;
  
  	rc = pqi_scsi_inquiry(ctrl_info, device->scsi3addr,
  		VPD_PAGE | CISS_VPD_LV_BYPASS_STATUS, buffer, 64);
  	if (rc)
  		goto out;
  
  #define RAID_BYPASS_STATUS	4
  #define RAID_BYPASS_CONFIGURED	0x1
  #define RAID_BYPASS_ENABLED	0x2
  
  	bypass_status = buffer[RAID_BYPASS_STATUS];
  	device->raid_bypass_configured =
  		(bypass_status & RAID_BYPASS_CONFIGURED) != 0;
  	if (device->raid_bypass_configured &&
  		(bypass_status & RAID_BYPASS_ENABLED) &&
  		pqi_get_raid_map(ctrl_info, device) == 0)
  		device->raid_bypass_enabled = true;
  
  out:
  	kfree(buffer);
  }
  
  /*
   * Use vendor-specific VPD to determine online/offline status of a volume.
   */
  
  static void pqi_get_volume_status(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	size_t page_length;
  	u8 volume_status = CISS_LV_STATUS_UNAVAILABLE;
  	bool volume_offline = true;
  	u32 volume_flags;
  	struct ciss_vpd_logical_volume_status *vpd;
  
  	vpd = kmalloc(sizeof(*vpd), GFP_KERNEL);
  	if (!vpd)
  		goto no_buffer;
  
  	rc = pqi_scsi_inquiry(ctrl_info, device->scsi3addr,
  		VPD_PAGE | CISS_VPD_LV_STATUS, vpd, sizeof(*vpd));
  	if (rc)
  		goto out;
  
  	page_length = offsetof(struct ciss_vpd_logical_volume_status,
  		volume_status) + vpd->page_length;
  	if (page_length < sizeof(*vpd))
  		goto out;
  
  	volume_status = vpd->volume_status;
  	volume_flags = get_unaligned_be32(&vpd->flags);
  	volume_offline = (volume_flags & CISS_LV_FLAGS_NO_HOST_IO) != 0;
  
  out:
  	kfree(vpd);
  no_buffer:
  	device->volume_status = volume_status;
  	device->volume_offline = volume_offline;
  }
  
  static int pqi_get_device_info(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	u8 *buffer;
  
  	buffer = kmalloc(64, GFP_KERNEL);
  	if (!buffer)
  		return -ENOMEM;
  
  	/* Send an inquiry to the device to see what it is. */
  	rc = pqi_scsi_inquiry(ctrl_info, device->scsi3addr, 0, buffer, 64);
  	if (rc)
  		goto out;
  
  	scsi_sanitize_inquiry_string(&buffer[8], 8);
  	scsi_sanitize_inquiry_string(&buffer[16], 16);
  
  	device->devtype = buffer[0] & 0x1f;
  	memcpy(device->vendor, &buffer[8], sizeof(device->vendor));
  	memcpy(device->model, &buffer[16], sizeof(device->model));
  
  	if (pqi_is_logical_device(device) && device->devtype == TYPE_DISK) {
  		if (device->is_external_raid_device) {
  			device->raid_level = SA_RAID_UNKNOWN;
  			device->volume_status = CISS_LV_OK;
  			device->volume_offline = false;
  		} else {
  			pqi_get_raid_level(ctrl_info, device);
  			pqi_get_raid_bypass_status(ctrl_info, device);
  			pqi_get_volume_status(ctrl_info, device);
  		}
  	}
  
  out:
  	kfree(buffer);
  
  	return rc;
  }
  
  static void pqi_get_physical_disk_info(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device,
  	struct bmic_identify_physical_device *id_phys)
  {
  	int rc;
  
  	memset(id_phys, 0, sizeof(*id_phys));
  
  	rc = pqi_identify_physical_device(ctrl_info, device,
  		id_phys, sizeof(*id_phys));
  	if (rc) {
  		device->queue_depth = PQI_PHYSICAL_DISK_DEFAULT_MAX_QUEUE_DEPTH;
  		return;
  	}
  
  	device->queue_depth =
  		get_unaligned_le16(&id_phys->current_queue_depth_limit);
  	device->device_type = id_phys->device_type;
  	device->active_path_index = id_phys->active_path_number;
  	device->path_map = id_phys->redundant_path_present_map;
  	memcpy(&device->box,
  		&id_phys->alternate_paths_phys_box_on_port,
  		sizeof(device->box));
  	memcpy(&device->phys_connector,
  		&id_phys->alternate_paths_phys_connector,
  		sizeof(device->phys_connector));
  	device->bay = id_phys->phys_bay_in_box;
  }
  
  static void pqi_show_volume_status(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	char *status;
  	static const char unknown_state_str[] =
  		"Volume is in an unknown state (%u)";
  	char unknown_state_buffer[sizeof(unknown_state_str) + 10];
  
  	switch (device->volume_status) {
  	case CISS_LV_OK:
  		status = "Volume online";
  		break;
  	case CISS_LV_FAILED:
  		status = "Volume failed";
  		break;
  	case CISS_LV_NOT_CONFIGURED:
  		status = "Volume not configured";
  		break;
  	case CISS_LV_DEGRADED:
  		status = "Volume degraded";
  		break;
  	case CISS_LV_READY_FOR_RECOVERY:
  		status = "Volume ready for recovery operation";
  		break;
  	case CISS_LV_UNDERGOING_RECOVERY:
  		status = "Volume undergoing recovery";
  		break;
  	case CISS_LV_WRONG_PHYSICAL_DRIVE_REPLACED:
  		status = "Wrong physical drive was replaced";
  		break;
  	case CISS_LV_PHYSICAL_DRIVE_CONNECTION_PROBLEM:
  		status = "A physical drive not properly connected";
  		break;
  	case CISS_LV_HARDWARE_OVERHEATING:
  		status = "Hardware is overheating";
  		break;
  	case CISS_LV_HARDWARE_HAS_OVERHEATED:
  		status = "Hardware has overheated";
  		break;
  	case CISS_LV_UNDERGOING_EXPANSION:
  		status = "Volume undergoing expansion";
  		break;
  	case CISS_LV_NOT_AVAILABLE:
  		status = "Volume waiting for transforming volume";
  		break;
  	case CISS_LV_QUEUED_FOR_EXPANSION:
  		status = "Volume queued for expansion";
  		break;
  	case CISS_LV_DISABLED_SCSI_ID_CONFLICT:
  		status = "Volume disabled due to SCSI ID conflict";
  		break;
  	case CISS_LV_EJECTED:
  		status = "Volume has been ejected";
  		break;
  	case CISS_LV_UNDERGOING_ERASE:
  		status = "Volume undergoing background erase";
  		break;
  	case CISS_LV_READY_FOR_PREDICTIVE_SPARE_REBUILD:
  		status = "Volume ready for predictive spare rebuild";
  		break;
  	case CISS_LV_UNDERGOING_RPI:
  		status = "Volume undergoing rapid parity initialization";
  		break;
  	case CISS_LV_PENDING_RPI:
  		status = "Volume queued for rapid parity initialization";
  		break;
  	case CISS_LV_ENCRYPTED_NO_KEY:
  		status = "Encrypted volume inaccessible - key not present";
  		break;
  	case CISS_LV_UNDERGOING_ENCRYPTION:
  		status = "Volume undergoing encryption process";
  		break;
  	case CISS_LV_UNDERGOING_ENCRYPTION_REKEYING:
  		status = "Volume undergoing encryption re-keying process";
  		break;
  	case CISS_LV_ENCRYPTED_IN_NON_ENCRYPTED_CONTROLLER:
  		status = "Volume encrypted but encryption is disabled";
  		break;
  	case CISS_LV_PENDING_ENCRYPTION:
  		status = "Volume pending migration to encrypted state";
  		break;
  	case CISS_LV_PENDING_ENCRYPTION_REKEYING:
  		status = "Volume pending encryption rekeying";
  		break;
  	case CISS_LV_NOT_SUPPORTED:
  		status = "Volume not supported on this controller";
  		break;
  	case CISS_LV_STATUS_UNAVAILABLE:
  		status = "Volume status not available";
  		break;
  	default:
  		snprintf(unknown_state_buffer, sizeof(unknown_state_buffer),
  			unknown_state_str, device->volume_status);
  		status = unknown_state_buffer;
  		break;
  	}
  
  	dev_info(&ctrl_info->pci_dev->dev,
  		"scsi %d:%d:%d:%d %s\n",
  		ctrl_info->scsi_host->host_no,
  		device->bus, device->target, device->lun, status);
  }
  
  static void pqi_rescan_worker(struct work_struct *work)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = container_of(to_delayed_work(work), struct pqi_ctrl_info,
  		rescan_work);
  
  	pqi_scan_scsi_devices(ctrl_info);
  }
  
  static int pqi_add_device(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  
  	if (pqi_is_logical_device(device))
  		rc = scsi_add_device(ctrl_info->scsi_host, device->bus,
  			device->target, device->lun);
  	else
  		rc = pqi_add_sas_device(ctrl_info->sas_host, device);
  
  	return rc;
  }
  
  static inline void pqi_remove_device(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	if (pqi_is_logical_device(device))
  		scsi_remove_device(device->sdev);
  	else
  		pqi_remove_sas_device(device);
  }
  
  /* Assumes the SCSI device list lock is held. */
  
  static struct pqi_scsi_dev *pqi_find_scsi_dev(struct pqi_ctrl_info *ctrl_info,
  	int bus, int target, int lun)
  {
  	struct pqi_scsi_dev *device;
  
  	list_for_each_entry(device, &ctrl_info->scsi_device_list,
  		scsi_device_list_entry)
  		if (device->bus == bus && device->target == target &&
  			device->lun == lun)
  			return device;
  
  	return NULL;
  }
  
  static inline bool pqi_device_equal(struct pqi_scsi_dev *dev1,
  	struct pqi_scsi_dev *dev2)
  {
  	if (dev1->is_physical_device != dev2->is_physical_device)
  		return false;
  
  	if (dev1->is_physical_device)
  		return dev1->wwid == dev2->wwid;
  
  	return memcmp(dev1->volume_id, dev2->volume_id,
  		sizeof(dev1->volume_id)) == 0;
  }
  
  enum pqi_find_result {
  	DEVICE_NOT_FOUND,
  	DEVICE_CHANGED,
  	DEVICE_SAME,
  };
  
  static enum pqi_find_result pqi_scsi_find_entry(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device_to_find,
  	struct pqi_scsi_dev **matching_device)
  {
  	struct pqi_scsi_dev *device;
  
  	list_for_each_entry(device, &ctrl_info->scsi_device_list,
  		scsi_device_list_entry) {
  		if (pqi_scsi3addr_equal(device_to_find->scsi3addr,
  			device->scsi3addr)) {
  			*matching_device = device;
  			if (pqi_device_equal(device_to_find, device)) {
  				if (device_to_find->volume_offline)
  					return DEVICE_CHANGED;
  				return DEVICE_SAME;
  			}
  			return DEVICE_CHANGED;
  		}
  	}
  
  	return DEVICE_NOT_FOUND;
  }
  
  #define PQI_DEV_INFO_BUFFER_LENGTH	128
  
  static void pqi_dev_info(struct pqi_ctrl_info *ctrl_info,
  	char *action, struct pqi_scsi_dev *device)
  {
  	ssize_t count;
  	char buffer[PQI_DEV_INFO_BUFFER_LENGTH];
  
  	count = snprintf(buffer, PQI_DEV_INFO_BUFFER_LENGTH,
  		"%d:%d:", ctrl_info->scsi_host->host_no, device->bus);
  
  	if (device->target_lun_valid)
  		count += snprintf(buffer + count,
  			PQI_DEV_INFO_BUFFER_LENGTH - count,
  			"%d:%d",
  			device->target,
  			device->lun);
  	else
  		count += snprintf(buffer + count,
  			PQI_DEV_INFO_BUFFER_LENGTH - count,
  			"-:-");
  
  	if (pqi_is_logical_device(device))
  		count += snprintf(buffer + count,
  			PQI_DEV_INFO_BUFFER_LENGTH - count,
  			" %08x%08x",
  			*((u32 *)&device->scsi3addr),
  			*((u32 *)&device->scsi3addr[4]));
  	else
  		count += snprintf(buffer + count,
  			PQI_DEV_INFO_BUFFER_LENGTH - count,
  			" %016llx", device->sas_address);
  
  	count += snprintf(buffer + count, PQI_DEV_INFO_BUFFER_LENGTH - count,
  		" %s %.8s %.16s ",
  		scsi_device_type(device->devtype),
  		device->vendor,
  		device->model);
  
  	if (pqi_is_logical_device(device)) {
  		if (device->devtype == TYPE_DISK)
  			count += snprintf(buffer + count,
  				PQI_DEV_INFO_BUFFER_LENGTH - count,
  				"SSDSmartPathCap%c En%c %-12s",
  				device->raid_bypass_configured ? '+' : '-',
  				device->raid_bypass_enabled ? '+' : '-',
  				pqi_raid_level_to_string(device->raid_level));
  	} else {
  		count += snprintf(buffer + count,
  			PQI_DEV_INFO_BUFFER_LENGTH - count,
  			"AIO%c", device->aio_enabled ? '+' : '-');
  		if (device->devtype == TYPE_DISK ||
  			device->devtype == TYPE_ZBC)
  			count += snprintf(buffer + count,
  				PQI_DEV_INFO_BUFFER_LENGTH - count,
  				" qd=%-6d", device->queue_depth);
  	}
  
  	dev_info(&ctrl_info->pci_dev->dev, "%s %s\n", action, buffer);
  }
  
  /* Assumes the SCSI device list lock is held. */
  
  static void pqi_scsi_update_device(struct pqi_scsi_dev *existing_device,
  	struct pqi_scsi_dev *new_device)
  {
  	existing_device->devtype = new_device->devtype;
  	existing_device->device_type = new_device->device_type;
  	existing_device->bus = new_device->bus;
  	if (new_device->target_lun_valid) {
  		existing_device->target = new_device->target;
  		existing_device->lun = new_device->lun;
  		existing_device->target_lun_valid = true;
  	}
  
  	/* By definition, the scsi3addr and wwid fields are already the same. */
  
  	existing_device->is_physical_device = new_device->is_physical_device;
  	existing_device->is_external_raid_device =
  		new_device->is_external_raid_device;
  	existing_device->aio_enabled = new_device->aio_enabled;
  	memcpy(existing_device->vendor, new_device->vendor,
  		sizeof(existing_device->vendor));
  	memcpy(existing_device->model, new_device->model,
  		sizeof(existing_device->model));
  	existing_device->sas_address = new_device->sas_address;
  	existing_device->raid_level = new_device->raid_level;
  	existing_device->queue_depth = new_device->queue_depth;
  	existing_device->aio_handle = new_device->aio_handle;
  	existing_device->volume_status = new_device->volume_status;
  	existing_device->active_path_index = new_device->active_path_index;
  	existing_device->path_map = new_device->path_map;
  	existing_device->bay = new_device->bay;
  	memcpy(existing_device->box, new_device->box,
  		sizeof(existing_device->box));
  	memcpy(existing_device->phys_connector, new_device->phys_connector,
  		sizeof(existing_device->phys_connector));
  	existing_device->offload_to_mirror = 0;
  	kfree(existing_device->raid_map);
  	existing_device->raid_map = new_device->raid_map;
  	existing_device->raid_bypass_configured =
  		new_device->raid_bypass_configured;
  	existing_device->raid_bypass_enabled =
  		new_device->raid_bypass_enabled;
  
  	/* To prevent this from being freed later. */
  	new_device->raid_map = NULL;
  }
  
  static inline void pqi_free_device(struct pqi_scsi_dev *device)
  {
  	if (device) {
  		kfree(device->raid_map);
  		kfree(device);
  	}
  }
  
  /*
   * Called when exposing a new device to the OS fails in order to re-adjust
   * our internal SCSI device list to match the SCSI ML's view.
   */
  
  static inline void pqi_fixup_botched_add(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  	list_del(&device->scsi_device_list_entry);
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	/* Allow the device structure to be freed later. */
  	device->keep_device = false;
  }
  
  static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *new_device_list[], unsigned int num_new_devices)
  {
  	int rc;
  	unsigned int i;
  	unsigned long flags;
  	enum pqi_find_result find_result;
  	struct pqi_scsi_dev *device;
  	struct pqi_scsi_dev *next;
  	struct pqi_scsi_dev *matching_device;
  	LIST_HEAD(add_list);
  	LIST_HEAD(delete_list);
  
  	/*
  	 * The idea here is to do as little work as possible while holding the
  	 * spinlock.  That's why we go to great pains to defer anything other
  	 * than updating the internal device list until after we release the
  	 * spinlock.
  	 */
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  	/* Assume that all devices in the existing list have gone away. */
  	list_for_each_entry(device, &ctrl_info->scsi_device_list,
  		scsi_device_list_entry)
  		device->device_gone = true;
  
  	for (i = 0; i < num_new_devices; i++) {
  		device = new_device_list[i];
  
  		find_result = pqi_scsi_find_entry(ctrl_info, device,
  						&matching_device);
  
  		switch (find_result) {
  		case DEVICE_SAME:
  			/*
  			 * The newly found device is already in the existing
  			 * device list.
  			 */
  			device->new_device = false;
  			matching_device->device_gone = false;
  			pqi_scsi_update_device(matching_device, device);
  			break;
  		case DEVICE_NOT_FOUND:
  			/*
  			 * The newly found device is NOT in the existing device
  			 * list.
  			 */
  			device->new_device = true;
  			break;
  		case DEVICE_CHANGED:
  			/*
  			 * The original device has gone away and we need to add
  			 * the new device.
  			 */
  			device->new_device = true;
  			break;
  		}
  	}
  
  	/* Process all devices that have gone away. */
  	list_for_each_entry_safe(device, next, &ctrl_info->scsi_device_list,
  		scsi_device_list_entry) {
  		if (device->device_gone) {
  			list_del(&device->scsi_device_list_entry);
  			list_add_tail(&device->delete_list_entry, &delete_list);
  		}
  	}
  
  	/* Process all new devices. */
  	for (i = 0; i < num_new_devices; i++) {
  		device = new_device_list[i];
  		if (!device->new_device)
  			continue;
  		if (device->volume_offline)
  			continue;
  		list_add_tail(&device->scsi_device_list_entry,
  			&ctrl_info->scsi_device_list);
  		list_add_tail(&device->add_list_entry, &add_list);
  		/* To prevent this device structure from being freed later. */
  		device->keep_device = true;
  	}
  
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	/* Remove all devices that have gone away. */
  	list_for_each_entry_safe(device, next, &delete_list,
  		delete_list_entry) {
  		if (device->volume_offline) {
  			pqi_dev_info(ctrl_info, "offline", device);
  			pqi_show_volume_status(ctrl_info, device);
  		} else {
  			pqi_dev_info(ctrl_info, "removed", device);
  		}
  		if (device->sdev)
  			pqi_remove_device(ctrl_info, device);
  		list_del(&device->delete_list_entry);
  		pqi_free_device(device);
  	}
  
  	/*
  	 * Notify the SCSI ML if the queue depth of any existing device has
  	 * changed.
  	 */
  	list_for_each_entry(device, &ctrl_info->scsi_device_list,
  		scsi_device_list_entry) {
  		if (device->sdev && device->queue_depth !=
  			device->advertised_queue_depth) {
  			device->advertised_queue_depth = device->queue_depth;
  			scsi_change_queue_depth(device->sdev,
  				device->advertised_queue_depth);
  		}
  	}
  
  	/* Expose any new devices. */
  	list_for_each_entry_safe(device, next, &add_list, add_list_entry) {
  		if (!device->sdev) {
  			pqi_dev_info(ctrl_info, "added", device);
  			rc = pqi_add_device(ctrl_info, device);
  			if (rc) {
  				dev_warn(&ctrl_info->pci_dev->dev,
  					"scsi %d:%d:%d:%d addition failed, device not added\n",
  					ctrl_info->scsi_host->host_no,
  					device->bus, device->target,
  					device->lun);
  				pqi_fixup_botched_add(ctrl_info, device);
  			}
  		}
  	}
  }
  
  static bool pqi_is_supported_device(struct pqi_scsi_dev *device)
  {
  	bool is_supported = false;
  
  	switch (device->devtype) {
  	case TYPE_DISK:
  	case TYPE_ZBC:
  	case TYPE_TAPE:
  	case TYPE_MEDIUM_CHANGER:
  	case TYPE_ENCLOSURE:
  		is_supported = true;
  		break;
  	case TYPE_RAID:
  		/*
  		 * Only support the HBA controller itself as a RAID
  		 * controller.  If it's a RAID controller other than
  		 * the HBA itself (an external RAID controller, for
  		 * example), we don't support it.
  		 */
  		if (pqi_is_hba_lunid(device->scsi3addr))
  			is_supported = true;
  		break;
  	}
  
  	return is_supported;
  }
  
  static inline bool pqi_skip_device(u8 *scsi3addr)
  {
  	/* Ignore all masked devices. */
  	if (MASKED_DEVICE(scsi3addr))
  		return true;
  
  	return false;
  }
  
  static int pqi_update_scsi_devices(struct pqi_ctrl_info *ctrl_info)
  {
  	int i;
  	int rc;
  	LIST_HEAD(new_device_list_head);
  	struct report_phys_lun_extended *physdev_list = NULL;
  	struct report_log_lun_extended *logdev_list = NULL;
  	struct report_phys_lun_extended_entry *phys_lun_ext_entry;
  	struct report_log_lun_extended_entry *log_lun_ext_entry;
  	struct bmic_identify_physical_device *id_phys = NULL;
  	u32 num_physicals;
  	u32 num_logicals;
  	struct pqi_scsi_dev **new_device_list = NULL;
  	struct pqi_scsi_dev *device;
  	struct pqi_scsi_dev *next;
  	unsigned int num_new_devices;
  	unsigned int num_valid_devices;
  	bool is_physical_device;
  	u8 *scsi3addr;
  	static char *out_of_memory_msg =
  		"failed to allocate memory, device discovery stopped";
  
  	rc = pqi_get_device_lists(ctrl_info, &physdev_list, &logdev_list);
  	if (rc)
  		goto out;
  
  	if (physdev_list)
  		num_physicals =
  			get_unaligned_be32(&physdev_list->header.list_length)
  				/ sizeof(physdev_list->lun_entries[0]);
  	else
  		num_physicals = 0;
  
  	if (logdev_list)
  		num_logicals =
  			get_unaligned_be32(&logdev_list->header.list_length)
  				/ sizeof(logdev_list->lun_entries[0]);
  	else
  		num_logicals = 0;
  
  	if (num_physicals) {
  		/*
  		 * We need this buffer for calls to pqi_get_physical_disk_info()
  		 * below.  We allocate it here instead of inside
  		 * pqi_get_physical_disk_info() because it's a fairly large
  		 * buffer.
  		 */
  		id_phys = kmalloc(sizeof(*id_phys), GFP_KERNEL);
  		if (!id_phys) {
  			dev_warn(&ctrl_info->pci_dev->dev, "%s\n",
  				out_of_memory_msg);
  			rc = -ENOMEM;
  			goto out;
  		}
  	}
  
  	num_new_devices = num_physicals + num_logicals;
  
  	new_device_list = kmalloc_array(num_new_devices,
  					sizeof(*new_device_list),
  					GFP_KERNEL);
  	if (!new_device_list) {
  		dev_warn(&ctrl_info->pci_dev->dev, "%s\n", out_of_memory_msg);
  		rc = -ENOMEM;
  		goto out;
  	}
  
  	for (i = 0; i < num_new_devices; i++) {
  		device = kzalloc(sizeof(*device), GFP_KERNEL);
  		if (!device) {
  			dev_warn(&ctrl_info->pci_dev->dev, "%s\n",
  				out_of_memory_msg);
  			rc = -ENOMEM;
  			goto out;
  		}
  		list_add_tail(&device->new_device_list_entry,
  			&new_device_list_head);
  	}
  
  	device = NULL;
  	num_valid_devices = 0;
  
  	for (i = 0; i < num_new_devices; i++) {
  
  		if (i < num_physicals) {
  			is_physical_device = true;
  			phys_lun_ext_entry = &physdev_list->lun_entries[i];
  			log_lun_ext_entry = NULL;
  			scsi3addr = phys_lun_ext_entry->lunid;
  		} else {
  			is_physical_device = false;
  			phys_lun_ext_entry = NULL;
  			log_lun_ext_entry =
  				&logdev_list->lun_entries[i - num_physicals];
  			scsi3addr = log_lun_ext_entry->lunid;
  		}
  
  		if (is_physical_device && pqi_skip_device(scsi3addr))
  			continue;
  
  		if (device)
  			device = list_next_entry(device, new_device_list_entry);
  		else
  			device = list_first_entry(&new_device_list_head,
  				struct pqi_scsi_dev, new_device_list_entry);
  
  		memcpy(device->scsi3addr, scsi3addr, sizeof(device->scsi3addr));
  		device->is_physical_device = is_physical_device;
  		if (!is_physical_device)
  			device->is_external_raid_device =
  				pqi_is_external_raid_addr(scsi3addr);
  
  		/* Gather information about the device. */
  		rc = pqi_get_device_info(ctrl_info, device);
  		if (rc == -ENOMEM) {
  			dev_warn(&ctrl_info->pci_dev->dev, "%s\n",
  				out_of_memory_msg);
  			goto out;
  		}
  		if (rc) {
  			if (device->is_physical_device)
  				dev_warn(&ctrl_info->pci_dev->dev,
  					"obtaining device info failed, skipping physical device %016llx\n",
  					get_unaligned_be64(
  						&phys_lun_ext_entry->wwid));
  			else
  				dev_warn(&ctrl_info->pci_dev->dev,
  					"obtaining device info failed, skipping logical device %08x%08x\n",
  					*((u32 *)&device->scsi3addr),
  					*((u32 *)&device->scsi3addr[4]));
  			rc = 0;
  			continue;
  		}
  
  		if (!pqi_is_supported_device(device))
  			continue;
  
  		pqi_assign_bus_target_lun(device);
  
  		if (device->is_physical_device) {
  			device->wwid = phys_lun_ext_entry->wwid;
  			if ((phys_lun_ext_entry->device_flags &
  				REPORT_PHYS_LUN_DEV_FLAG_AIO_ENABLED) &&
  				phys_lun_ext_entry->aio_handle)
  				device->aio_enabled = true;
  		} else {
  			memcpy(device->volume_id, log_lun_ext_entry->volume_id,
  				sizeof(device->volume_id));
  		}
  
  		switch (device->devtype) {
  		case TYPE_DISK:
  		case TYPE_ZBC:
  		case TYPE_ENCLOSURE:
  			if (device->is_physical_device) {
  				device->sas_address =
  					get_unaligned_be64(&device->wwid);
  				if (device->devtype == TYPE_DISK ||
  					device->devtype == TYPE_ZBC) {
  					device->aio_handle =
  						phys_lun_ext_entry->aio_handle;
  					pqi_get_physical_disk_info(ctrl_info,
  						device, id_phys);
  				}
  			}
  			break;
  		}
  
  		new_device_list[num_valid_devices++] = device;
  	}
  
  	pqi_update_device_list(ctrl_info, new_device_list, num_valid_devices);
  
  out:
  	list_for_each_entry_safe(device, next, &new_device_list_head,
  		new_device_list_entry) {
  		if (device->keep_device)
  			continue;
  		list_del(&device->new_device_list_entry);
  		pqi_free_device(device);
  	}
  
  	kfree(new_device_list);
  	kfree(physdev_list);
  	kfree(logdev_list);
  	kfree(id_phys);
  
  	return rc;
  }
  
  static void pqi_remove_all_scsi_devices(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned long flags;
  	struct pqi_scsi_dev *device;
  
  	while (1) {
  		spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  		device = list_first_entry_or_null(&ctrl_info->scsi_device_list,
  			struct pqi_scsi_dev, scsi_device_list_entry);
  		if (device)
  			list_del(&device->scsi_device_list_entry);
  
  		spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock,
  			flags);
  
  		if (!device)
  			break;
  
  		if (device->sdev)
  			pqi_remove_device(ctrl_info, device);
  		pqi_free_device(device);
  	}
  }
  
  static int pqi_scan_scsi_devices(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  
  	if (pqi_ctrl_offline(ctrl_info))
  		return -ENXIO;
  
  	mutex_lock(&ctrl_info->scan_mutex);
  
  	rc = pqi_update_scsi_devices(ctrl_info);
  	if (rc)
  		pqi_schedule_rescan_worker_delayed(ctrl_info);
  
  	mutex_unlock(&ctrl_info->scan_mutex);
  
  	return rc;
  }
  
  static void pqi_scan_start(struct Scsi_Host *shost)
  {
  	pqi_scan_scsi_devices(shost_to_hba(shost));
  }
  
  /* Returns TRUE if scan is finished. */
  
  static int pqi_scan_finished(struct Scsi_Host *shost,
  	unsigned long elapsed_time)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = shost_priv(shost);
  
  	return !mutex_is_locked(&ctrl_info->scan_mutex);
  }
  
  static void pqi_wait_until_scan_finished(struct pqi_ctrl_info *ctrl_info)
  {
  	mutex_lock(&ctrl_info->scan_mutex);
  	mutex_unlock(&ctrl_info->scan_mutex);
  }
  
  static void pqi_wait_until_lun_reset_finished(struct pqi_ctrl_info *ctrl_info)
  {
  	mutex_lock(&ctrl_info->lun_reset_mutex);
  	mutex_unlock(&ctrl_info->lun_reset_mutex);
  }
  
  static inline void pqi_set_encryption_info(
  	struct pqi_encryption_info *encryption_info, struct raid_map *raid_map,
  	u64 first_block)
  {
  	u32 volume_blk_size;
  
  	/*
  	 * Set the encryption tweak values based on logical block address.
  	 * If the block size is 512, the tweak value is equal to the LBA.
  	 * For other block sizes, tweak value is (LBA * block size) / 512.
  	 */
  	volume_blk_size = get_unaligned_le32(&raid_map->volume_blk_size);
  	if (volume_blk_size != 512)
  		first_block = (first_block * volume_blk_size) / 512;
  
  	encryption_info->data_encryption_key_index =
  		get_unaligned_le16(&raid_map->data_encryption_key_index);
  	encryption_info->encrypt_tweak_lower = lower_32_bits(first_block);
  	encryption_info->encrypt_tweak_upper = upper_32_bits(first_block);
  }
  
  /*
   * Attempt to perform RAID bypass mapping for a logical volume I/O.
   */
  
  #define PQI_RAID_BYPASS_INELIGIBLE	1
  
  static int pqi_raid_bypass_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device, struct scsi_cmnd *scmd,
  	struct pqi_queue_group *queue_group)
  {
  	struct raid_map *raid_map;
  	bool is_write = false;
  	u32 map_index;
  	u64 first_block;
  	u64 last_block;
  	u32 block_cnt;
  	u32 blocks_per_row;
  	u64 first_row;
  	u64 last_row;
  	u32 first_row_offset;
  	u32 last_row_offset;
  	u32 first_column;
  	u32 last_column;
  	u64 r0_first_row;
  	u64 r0_last_row;
  	u32 r5or6_blocks_per_row;
  	u64 r5or6_first_row;
  	u64 r5or6_last_row;
  	u32 r5or6_first_row_offset;
  	u32 r5or6_last_row_offset;
  	u32 r5or6_first_column;
  	u32 r5or6_last_column;
  	u16 data_disks_per_row;
  	u32 total_disks_per_row;
  	u16 layout_map_count;
  	u32 stripesize;
  	u16 strip_size;
  	u32 first_group;
  	u32 last_group;
  	u32 current_group;
  	u32 map_row;
  	u32 aio_handle;
  	u64 disk_block;
  	u32 disk_block_cnt;
  	u8 cdb[16];
  	u8 cdb_length;
  	int offload_to_mirror;
  	struct pqi_encryption_info *encryption_info_ptr;
  	struct pqi_encryption_info encryption_info;
  #if BITS_PER_LONG == 32
  	u64 tmpdiv;
  #endif
  
  	/* Check for valid opcode, get LBA and block count. */
  	switch (scmd->cmnd[0]) {
  	case WRITE_6:
  		is_write = true;
  		/* fall through */
  	case READ_6:
  		first_block = (u64)(((scmd->cmnd[1] & 0x1f) << 16) |
  			(scmd->cmnd[2] << 8) | scmd->cmnd[3]);
  		block_cnt = (u32)scmd->cmnd[4];
  		if (block_cnt == 0)
  			block_cnt = 256;
  		break;
  	case WRITE_10:
  		is_write = true;
  		/* fall through */
  	case READ_10:
  		first_block = (u64)get_unaligned_be32(&scmd->cmnd[2]);
  		block_cnt = (u32)get_unaligned_be16(&scmd->cmnd[7]);
  		break;
  	case WRITE_12:
  		is_write = true;
  		/* fall through */
  	case READ_12:
  		first_block = (u64)get_unaligned_be32(&scmd->cmnd[2]);
  		block_cnt = get_unaligned_be32(&scmd->cmnd[6]);
  		break;
  	case WRITE_16:
  		is_write = true;
  		/* fall through */
  	case READ_16:
  		first_block = get_unaligned_be64(&scmd->cmnd[2]);
  		block_cnt = get_unaligned_be32(&scmd->cmnd[10]);
  		break;
  	default:
  		/* Process via normal I/O path. */
  		return PQI_RAID_BYPASS_INELIGIBLE;
  	}
  
  	/* Check for write to non-RAID-0. */
  	if (is_write && device->raid_level != SA_RAID_0)
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	if (unlikely(block_cnt == 0))
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	last_block = first_block + block_cnt - 1;
  	raid_map = device->raid_map;
  
  	/* Check for invalid block or wraparound. */
  	if (last_block >= get_unaligned_le64(&raid_map->volume_blk_cnt) ||
  		last_block < first_block)
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	data_disks_per_row = get_unaligned_le16(&raid_map->data_disks_per_row);
  	strip_size = get_unaligned_le16(&raid_map->strip_size);
  	layout_map_count = get_unaligned_le16(&raid_map->layout_map_count);
  
  	/* Calculate stripe information for the request. */
  	blocks_per_row = data_disks_per_row * strip_size;
  #if BITS_PER_LONG == 32
  	tmpdiv = first_block;
  	do_div(tmpdiv, blocks_per_row);
  	first_row = tmpdiv;
  	tmpdiv = last_block;
  	do_div(tmpdiv, blocks_per_row);
  	last_row = tmpdiv;
  	first_row_offset = (u32)(first_block - (first_row * blocks_per_row));
  	last_row_offset = (u32)(last_block - (last_row * blocks_per_row));
  	tmpdiv = first_row_offset;
  	do_div(tmpdiv, strip_size);
  	first_column = tmpdiv;
  	tmpdiv = last_row_offset;
  	do_div(tmpdiv, strip_size);
  	last_column = tmpdiv;
  #else
  	first_row = first_block / blocks_per_row;
  	last_row = last_block / blocks_per_row;
  	first_row_offset = (u32)(first_block - (first_row * blocks_per_row));
  	last_row_offset = (u32)(last_block - (last_row * blocks_per_row));
  	first_column = first_row_offset / strip_size;
  	last_column = last_row_offset / strip_size;
  #endif
  
  	/* If this isn't a single row/column then give to the controller. */
  	if (first_row != last_row || first_column != last_column)
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	/* Proceeding with driver mapping. */
  	total_disks_per_row = data_disks_per_row +
  		get_unaligned_le16(&raid_map->metadata_disks_per_row);
  	map_row = ((u32)(first_row >> raid_map->parity_rotation_shift)) %
  		get_unaligned_le16(&raid_map->row_cnt);
  	map_index = (map_row * total_disks_per_row) + first_column;
  
  	/* RAID 1 */
  	if (device->raid_level == SA_RAID_1) {
  		if (device->offload_to_mirror)
  			map_index += data_disks_per_row;
  		device->offload_to_mirror = !device->offload_to_mirror;
  	} else if (device->raid_level == SA_RAID_ADM) {
  		/* RAID ADM */
  		/*
  		 * Handles N-way mirrors  (R1-ADM) and R10 with # of drives
  		 * divisible by 3.
  		 */
  		offload_to_mirror = device->offload_to_mirror;
  		if (offload_to_mirror == 0)  {
  			/* use physical disk in the first mirrored group. */
  			map_index %= data_disks_per_row;
  		} else {
  			do {
  				/*
  				 * Determine mirror group that map_index
  				 * indicates.
  				 */
  				current_group = map_index / data_disks_per_row;
  
  				if (offload_to_mirror != current_group) {
  					if (current_group <
  						layout_map_count - 1) {
  						/*
  						 * Select raid index from
  						 * next group.
  						 */
  						map_index += data_disks_per_row;
  						current_group++;
  					} else {
  						/*
  						 * Select raid index from first
  						 * group.
  						 */
  						map_index %= data_disks_per_row;
  						current_group = 0;
  					}
  				}
  			} while (offload_to_mirror != current_group);
  		}
  
  		/* Set mirror group to use next time. */
  		offload_to_mirror =
  			(offload_to_mirror >= layout_map_count - 1) ?
  				0 : offload_to_mirror + 1;
  		WARN_ON(offload_to_mirror >= layout_map_count);
  		device->offload_to_mirror = offload_to_mirror;
  		/*
  		 * Avoid direct use of device->offload_to_mirror within this
  		 * function since multiple threads might simultaneously
  		 * increment it beyond the range of device->layout_map_count -1.
  		 */
  	} else if ((device->raid_level == SA_RAID_5 ||
  		device->raid_level == SA_RAID_6) && layout_map_count > 1) {
  		/* RAID 50/60 */
  		/* Verify first and last block are in same RAID group */
  		r5or6_blocks_per_row = strip_size * data_disks_per_row;
  		stripesize = r5or6_blocks_per_row * layout_map_count;
  #if BITS_PER_LONG == 32
  		tmpdiv = first_block;
  		first_group = do_div(tmpdiv, stripesize);
  		tmpdiv = first_group;
  		do_div(tmpdiv, r5or6_blocks_per_row);
  		first_group = tmpdiv;
  		tmpdiv = last_block;
  		last_group = do_div(tmpdiv, stripesize);
  		tmpdiv = last_group;
  		do_div(tmpdiv, r5or6_blocks_per_row);
  		last_group = tmpdiv;
  #else
  		first_group = (first_block % stripesize) / r5or6_blocks_per_row;
  		last_group = (last_block % stripesize) / r5or6_blocks_per_row;
  #endif
  		if (first_group != last_group)
  			return PQI_RAID_BYPASS_INELIGIBLE;
  
  		/* Verify request is in a single row of RAID 5/6 */
  #if BITS_PER_LONG == 32
  		tmpdiv = first_block;
  		do_div(tmpdiv, stripesize);
  		first_row = r5or6_first_row = r0_first_row = tmpdiv;
  		tmpdiv = last_block;
  		do_div(tmpdiv, stripesize);
  		r5or6_last_row = r0_last_row = tmpdiv;
  #else
  		first_row = r5or6_first_row = r0_first_row =
  			first_block / stripesize;
  		r5or6_last_row = r0_last_row = last_block / stripesize;
  #endif
  		if (r5or6_first_row != r5or6_last_row)
  			return PQI_RAID_BYPASS_INELIGIBLE;
  
  		/* Verify request is in a single column */
  #if BITS_PER_LONG == 32
  		tmpdiv = first_block;
  		first_row_offset = do_div(tmpdiv, stripesize);
  		tmpdiv = first_row_offset;
  		first_row_offset = (u32)do_div(tmpdiv, r5or6_blocks_per_row);
  		r5or6_first_row_offset = first_row_offset;
  		tmpdiv = last_block;
  		r5or6_last_row_offset = do_div(tmpdiv, stripesize);
  		tmpdiv = r5or6_last_row_offset;
  		r5or6_last_row_offset = do_div(tmpdiv, r5or6_blocks_per_row);
  		tmpdiv = r5or6_first_row_offset;
  		do_div(tmpdiv, strip_size);
  		first_column = r5or6_first_column = tmpdiv;
  		tmpdiv = r5or6_last_row_offset;
  		do_div(tmpdiv, strip_size);
  		r5or6_last_column = tmpdiv;
  #else
  		first_row_offset = r5or6_first_row_offset =
  			(u32)((first_block % stripesize) %
  			r5or6_blocks_per_row);
  
  		r5or6_last_row_offset =
  			(u32)((last_block % stripesize) %
  			r5or6_blocks_per_row);
  
  		first_column = r5or6_first_row_offset / strip_size;
  		r5or6_first_column = first_column;
  		r5or6_last_column = r5or6_last_row_offset / strip_size;
  #endif
  		if (r5or6_first_column != r5or6_last_column)
  			return PQI_RAID_BYPASS_INELIGIBLE;
  
  		/* Request is eligible */
  		map_row =
  			((u32)(first_row >> raid_map->parity_rotation_shift)) %
  			get_unaligned_le16(&raid_map->row_cnt);
  
  		map_index = (first_group *
  			(get_unaligned_le16(&raid_map->row_cnt) *
  			total_disks_per_row)) +
  			(map_row * total_disks_per_row) + first_column;
  	}
  
  	if (unlikely(map_index >= RAID_MAP_MAX_ENTRIES))
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	aio_handle = raid_map->disk_data[map_index].aio_handle;
  	disk_block = get_unaligned_le64(&raid_map->disk_starting_blk) +
  		first_row * strip_size +
  		(first_row_offset - first_column * strip_size);
  	disk_block_cnt = block_cnt;
  
  	/* Handle differing logical/physical block sizes. */
  	if (raid_map->phys_blk_shift) {
  		disk_block <<= raid_map->phys_blk_shift;
  		disk_block_cnt <<= raid_map->phys_blk_shift;
  	}
  
  	if (unlikely(disk_block_cnt > 0xffff))
  		return PQI_RAID_BYPASS_INELIGIBLE;
  
  	/* Build the new CDB for the physical disk I/O. */
  	if (disk_block > 0xffffffff) {
  		cdb[0] = is_write ? WRITE_16 : READ_16;
  		cdb[1] = 0;
  		put_unaligned_be64(disk_block, &cdb[2]);
  		put_unaligned_be32(disk_block_cnt, &cdb[10]);
  		cdb[14] = 0;
  		cdb[15] = 0;
  		cdb_length = 16;
  	} else {
  		cdb[0] = is_write ? WRITE_10 : READ_10;
  		cdb[1] = 0;
  		put_unaligned_be32((u32)disk_block, &cdb[2]);
  		cdb[6] = 0;
  		put_unaligned_be16((u16)disk_block_cnt, &cdb[7]);
  		cdb[9] = 0;
  		cdb_length = 10;
  	}
  
  	if (get_unaligned_le16(&raid_map->flags) &
  		RAID_MAP_ENCRYPTION_ENABLED) {
  		pqi_set_encryption_info(&encryption_info, raid_map,
  			first_block);
  		encryption_info_ptr = &encryption_info;
  	} else {
  		encryption_info_ptr = NULL;
  	}
  
  	return pqi_aio_submit_io(ctrl_info, scmd, aio_handle,
  		cdb, cdb_length, queue_group, encryption_info_ptr, true);
  }
  
  #define PQI_STATUS_IDLE		0x0
  
  #define PQI_CREATE_ADMIN_QUEUE_PAIR	1
  #define PQI_DELETE_ADMIN_QUEUE_PAIR	2
  
  #define PQI_DEVICE_STATE_POWER_ON_AND_RESET		0x0
  #define PQI_DEVICE_STATE_STATUS_AVAILABLE		0x1
  #define PQI_DEVICE_STATE_ALL_REGISTERS_READY		0x2
  #define PQI_DEVICE_STATE_ADMIN_QUEUE_PAIR_READY		0x3
  #define PQI_DEVICE_STATE_ERROR				0x4
  
  #define PQI_MODE_READY_TIMEOUT_SECS		30
  #define PQI_MODE_READY_POLL_INTERVAL_MSECS	1
  
  static int pqi_wait_for_pqi_mode_ready(struct pqi_ctrl_info *ctrl_info)
  {
  	struct pqi_device_registers __iomem *pqi_registers;
  	unsigned long timeout;
  	u64 signature;
  	u8 status;
  
  	pqi_registers = ctrl_info->pqi_registers;
  	timeout = (PQI_MODE_READY_TIMEOUT_SECS * HZ) + jiffies;
  
  	while (1) {
  		signature = readq(&pqi_registers->signature);
  		if (memcmp(&signature, PQI_DEVICE_SIGNATURE,
  			sizeof(signature)) == 0)
  			break;
  		if (time_after(jiffies, timeout)) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"timed out waiting for PQI signature\n");
  			return -ETIMEDOUT;
  		}
  		msleep(PQI_MODE_READY_POLL_INTERVAL_MSECS);
  	}
  
  	while (1) {
  		status = readb(&pqi_registers->function_and_status_code);
  		if (status == PQI_STATUS_IDLE)
  			break;
  		if (time_after(jiffies, timeout)) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"timed out waiting for PQI IDLE\n");
  			return -ETIMEDOUT;
  		}
  		msleep(PQI_MODE_READY_POLL_INTERVAL_MSECS);
  	}
  
  	while (1) {
  		if (readl(&pqi_registers->device_status) ==
  			PQI_DEVICE_STATE_ALL_REGISTERS_READY)
  			break;
  		if (time_after(jiffies, timeout)) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"timed out waiting for PQI all registers ready\n");
  			return -ETIMEDOUT;
  		}
  		msleep(PQI_MODE_READY_POLL_INTERVAL_MSECS);
  	}
  
  	return 0;
  }
  
  static inline void pqi_aio_path_disabled(struct pqi_io_request *io_request)
  {
  	struct pqi_scsi_dev *device;
  
  	device = io_request->scmd->device->hostdata;
  	device->raid_bypass_enabled = false;
  	device->aio_enabled = false;
  }
  
  static inline void pqi_take_device_offline(struct scsi_device *sdev, char *path)
  {
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_scsi_dev *device;
  
  	device = sdev->hostdata;
  	if (device->device_offline)
  		return;
  
  	device->device_offline = true;
  	scsi_device_set_state(sdev, SDEV_OFFLINE);
  	ctrl_info = shost_to_hba(sdev->host);
  	pqi_schedule_rescan_worker(ctrl_info);
  	dev_err(&ctrl_info->pci_dev->dev, "offlined %s scsi %d:%d:%d:%d\n",
  		path, ctrl_info->scsi_host->host_no, device->bus,
  		device->target, device->lun);
  }
  
  static void pqi_process_raid_io_error(struct pqi_io_request *io_request)
  {
  	u8 scsi_status;
  	u8 host_byte;
  	struct scsi_cmnd *scmd;
  	struct pqi_raid_error_info *error_info;
  	size_t sense_data_length;
  	int residual_count;
  	int xfer_count;
  	struct scsi_sense_hdr sshdr;
  
  	scmd = io_request->scmd;
  	if (!scmd)
  		return;
  
  	error_info = io_request->error_info;
  	scsi_status = error_info->status;
  	host_byte = DID_OK;
  
  	switch (error_info->data_out_result) {
  	case PQI_DATA_IN_OUT_GOOD:
  		break;
  	case PQI_DATA_IN_OUT_UNDERFLOW:
  		xfer_count =
  			get_unaligned_le32(&error_info->data_out_transferred);
  		residual_count = scsi_bufflen(scmd) - xfer_count;
  		scsi_set_resid(scmd, residual_count);
  		if (xfer_count < scmd->underflow)
  			host_byte = DID_SOFT_ERROR;
  		break;
  	case PQI_DATA_IN_OUT_UNSOLICITED_ABORT:
  	case PQI_DATA_IN_OUT_ABORTED:
  		host_byte = DID_ABORT;
  		break;
  	case PQI_DATA_IN_OUT_TIMEOUT:
  		host_byte = DID_TIME_OUT;
  		break;
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW:
  	case PQI_DATA_IN_OUT_PROTOCOL_ERROR:
  	case PQI_DATA_IN_OUT_BUFFER_ERROR:
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW_DESCRIPTOR_AREA:
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW_BRIDGE:
  	case PQI_DATA_IN_OUT_ERROR:
  	case PQI_DATA_IN_OUT_HARDWARE_ERROR:
  	case PQI_DATA_IN_OUT_PCIE_FABRIC_ERROR:
  	case PQI_DATA_IN_OUT_PCIE_COMPLETION_TIMEOUT:
  	case PQI_DATA_IN_OUT_PCIE_COMPLETER_ABORT_RECEIVED:
  	case PQI_DATA_IN_OUT_PCIE_UNSUPPORTED_REQUEST_RECEIVED:
  	case PQI_DATA_IN_OUT_PCIE_ECRC_CHECK_FAILED:
  	case PQI_DATA_IN_OUT_PCIE_UNSUPPORTED_REQUEST:
  	case PQI_DATA_IN_OUT_PCIE_ACS_VIOLATION:
  	case PQI_DATA_IN_OUT_PCIE_TLP_PREFIX_BLOCKED:
  	case PQI_DATA_IN_OUT_PCIE_POISONED_MEMORY_READ:
  	default:
  		host_byte = DID_ERROR;
  		break;
  	}
  
  	sense_data_length = get_unaligned_le16(&error_info->sense_data_length);
  	if (sense_data_length == 0)
  		sense_data_length =
  			get_unaligned_le16(&error_info->response_data_length);
  	if (sense_data_length) {
  		if (sense_data_length > sizeof(error_info->data))
  			sense_data_length = sizeof(error_info->data);
  
  		if (scsi_status == SAM_STAT_CHECK_CONDITION &&
  			scsi_normalize_sense(error_info->data,
  				sense_data_length, &sshdr) &&
  				sshdr.sense_key == HARDWARE_ERROR &&
  				sshdr.asc == 0x3e &&
  				sshdr.ascq == 0x1) {
  			pqi_take_device_offline(scmd->device, "RAID");
  			host_byte = DID_NO_CONNECT;
  		}
  
  		if (sense_data_length > SCSI_SENSE_BUFFERSIZE)
  			sense_data_length = SCSI_SENSE_BUFFERSIZE;
  		memcpy(scmd->sense_buffer, error_info->data,
  			sense_data_length);
  	}
  
  	scmd->result = scsi_status;
  	set_host_byte(scmd, host_byte);
  }
  
  static void pqi_process_aio_io_error(struct pqi_io_request *io_request)
  {
  	u8 scsi_status;
  	u8 host_byte;
  	struct scsi_cmnd *scmd;
  	struct pqi_aio_error_info *error_info;
  	size_t sense_data_length;
  	int residual_count;
  	int xfer_count;
  	bool device_offline;
  
  	scmd = io_request->scmd;
  	error_info = io_request->error_info;
  	host_byte = DID_OK;
  	sense_data_length = 0;
  	device_offline = false;
  
  	switch (error_info->service_response) {
  	case PQI_AIO_SERV_RESPONSE_COMPLETE:
  		scsi_status = error_info->status;
  		break;
  	case PQI_AIO_SERV_RESPONSE_FAILURE:
  		switch (error_info->status) {
  		case PQI_AIO_STATUS_IO_ABORTED:
  			scsi_status = SAM_STAT_TASK_ABORTED;
  			break;
  		case PQI_AIO_STATUS_UNDERRUN:
  			scsi_status = SAM_STAT_GOOD;
  			residual_count = get_unaligned_le32(
  						&error_info->residual_count);
  			scsi_set_resid(scmd, residual_count);
  			xfer_count = scsi_bufflen(scmd) - residual_count;
  			if (xfer_count < scmd->underflow)
  				host_byte = DID_SOFT_ERROR;
  			break;
  		case PQI_AIO_STATUS_OVERRUN:
  			scsi_status = SAM_STAT_GOOD;
  			break;
  		case PQI_AIO_STATUS_AIO_PATH_DISABLED:
  			pqi_aio_path_disabled(io_request);
  			scsi_status = SAM_STAT_GOOD;
  			io_request->status = -EAGAIN;
  			break;
  		case PQI_AIO_STATUS_NO_PATH_TO_DEVICE:
  		case PQI_AIO_STATUS_INVALID_DEVICE:
  			if (!io_request->raid_bypass) {
  				device_offline = true;
  				pqi_take_device_offline(scmd->device, "AIO");
  				host_byte = DID_NO_CONNECT;
  			}
  			scsi_status = SAM_STAT_CHECK_CONDITION;
  			break;
  		case PQI_AIO_STATUS_IO_ERROR:
  		default:
  			scsi_status = SAM_STAT_CHECK_CONDITION;
  			break;
  		}
  		break;
  	case PQI_AIO_SERV_RESPONSE_TMF_COMPLETE:
  	case PQI_AIO_SERV_RESPONSE_TMF_SUCCEEDED:
  		scsi_status = SAM_STAT_GOOD;
  		break;
  	case PQI_AIO_SERV_RESPONSE_TMF_REJECTED:
  	case PQI_AIO_SERV_RESPONSE_TMF_INCORRECT_LUN:
  	default:
  		scsi_status = SAM_STAT_CHECK_CONDITION;
  		break;
  	}
  
  	if (error_info->data_present) {
  		sense_data_length =
  			get_unaligned_le16(&error_info->data_length);
  		if (sense_data_length) {
  			if (sense_data_length > sizeof(error_info->data))
  				sense_data_length = sizeof(error_info->data);
  			if (sense_data_length > SCSI_SENSE_BUFFERSIZE)
  				sense_data_length = SCSI_SENSE_BUFFERSIZE;
  			memcpy(scmd->sense_buffer, error_info->data,
  				sense_data_length);
  		}
  	}
  
  	if (device_offline && sense_data_length == 0)
  		scsi_build_sense_buffer(0, scmd->sense_buffer, HARDWARE_ERROR,
  			0x3e, 0x1);
  
  	scmd->result = scsi_status;
  	set_host_byte(scmd, host_byte);
  }
  
  static void pqi_process_io_error(unsigned int iu_type,
  	struct pqi_io_request *io_request)
  {
  	switch (iu_type) {
  	case PQI_RESPONSE_IU_RAID_PATH_IO_ERROR:
  		pqi_process_raid_io_error(io_request);
  		break;
  	case PQI_RESPONSE_IU_AIO_PATH_IO_ERROR:
  		pqi_process_aio_io_error(io_request);
  		break;
  	}
  }
  
  static int pqi_interpret_task_management_response(
  	struct pqi_task_management_response *response)
  {
  	int rc;
  
  	switch (response->response_code) {
  	case SOP_TMF_COMPLETE:
  	case SOP_TMF_FUNCTION_SUCCEEDED:
  		rc = 0;
  		break;
  	default:
  		rc = -EIO;
  		break;
  	}
  
  	return rc;
  }
  
  static unsigned int pqi_process_io_intr(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_queue_group *queue_group)
  {
  	unsigned int num_responses;
  	pqi_index_t oq_pi;
  	pqi_index_t oq_ci;
  	struct pqi_io_request *io_request;
  	struct pqi_io_response *response;
  	u16 request_id;
  
  	num_responses = 0;
  	oq_ci = queue_group->oq_ci_copy;
  
  	while (1) {
  		oq_pi = *queue_group->oq_pi;
  		if (oq_pi == oq_ci)
  			break;
  
  		num_responses++;
  		response = queue_group->oq_element_array +
  			(oq_ci * PQI_OPERATIONAL_OQ_ELEMENT_LENGTH);
  
  		request_id = get_unaligned_le16(&response->request_id);
  		WARN_ON(request_id >= ctrl_info->max_io_slots);
  
  		io_request = &ctrl_info->io_request_pool[request_id];
  		WARN_ON(atomic_read(&io_request->refcount) == 0);
  
  		switch (response->header.iu_type) {
  		case PQI_RESPONSE_IU_RAID_PATH_IO_SUCCESS:
  		case PQI_RESPONSE_IU_AIO_PATH_IO_SUCCESS:
  		case PQI_RESPONSE_IU_GENERAL_MANAGEMENT:
  			break;
  		case PQI_RESPONSE_IU_TASK_MANAGEMENT:
  			io_request->status =
  				pqi_interpret_task_management_response(
  					(void *)response);
  			break;
  		case PQI_RESPONSE_IU_AIO_PATH_DISABLED:
  			pqi_aio_path_disabled(io_request);
  			io_request->status = -EAGAIN;
  			break;
  		case PQI_RESPONSE_IU_RAID_PATH_IO_ERROR:
  		case PQI_RESPONSE_IU_AIO_PATH_IO_ERROR:
  			io_request->error_info = ctrl_info->error_buffer +
  				(get_unaligned_le16(&response->error_index) *
  				PQI_ERROR_BUFFER_ELEMENT_LENGTH);
  			pqi_process_io_error(response->header.iu_type,
  				io_request);
  			break;
  		default:
  			dev_err(&ctrl_info->pci_dev->dev,
  				"unexpected IU type: 0x%x\n",
  				response->header.iu_type);
  			break;
  		}
  
  		io_request->io_complete_callback(io_request,
  			io_request->context);
  
  		/*
  		 * Note that the I/O request structure CANNOT BE TOUCHED after
  		 * returning from the I/O completion callback!
  		 */
  
  		oq_ci = (oq_ci + 1) % ctrl_info->num_elements_per_oq;
  	}
  
  	if (num_responses) {
  		queue_group->oq_ci_copy = oq_ci;
  		writel(oq_ci, queue_group->oq_ci);
  	}
  
  	return num_responses;
  }
  
  static inline unsigned int pqi_num_elements_free(unsigned int pi,
  	unsigned int ci, unsigned int elements_in_queue)
  {
  	unsigned int num_elements_used;
  
  	if (pi >= ci)
  		num_elements_used = pi - ci;
  	else
  		num_elements_used = elements_in_queue - ci + pi;
  
  	return elements_in_queue - num_elements_used - 1;
  }
  
  static void pqi_send_event_ack(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_event_acknowledge_request *iu, size_t iu_length)
  {
  	pqi_index_t iq_pi;
  	pqi_index_t iq_ci;
  	unsigned long flags;
  	void *next_element;
  	struct pqi_queue_group *queue_group;
  
  	queue_group = &ctrl_info->queue_groups[PQI_DEFAULT_QUEUE_GROUP];
  	put_unaligned_le16(queue_group->oq_id, &iu->header.response_queue_id);
  
  	while (1) {
  		spin_lock_irqsave(&queue_group->submit_lock[RAID_PATH], flags);
  
  		iq_pi = queue_group->iq_pi_copy[RAID_PATH];
  		iq_ci = *queue_group->iq_ci[RAID_PATH];
  
  		if (pqi_num_elements_free(iq_pi, iq_ci,
  			ctrl_info->num_elements_per_iq))
  			break;
  
  		spin_unlock_irqrestore(
  			&queue_group->submit_lock[RAID_PATH], flags);
  
  		if (pqi_ctrl_offline(ctrl_info))
  			return;
  	}
  
  	next_element = queue_group->iq_element_array[RAID_PATH] +
  		(iq_pi * PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  	memcpy(next_element, iu, iu_length);
  
  	iq_pi = (iq_pi + 1) % ctrl_info->num_elements_per_iq;
  	queue_group->iq_pi_copy[RAID_PATH] = iq_pi;
  
  	/*
  	 * This write notifies the controller that an IU is available to be
  	 * processed.
  	 */
  	writel(iq_pi, queue_group->iq_pi[RAID_PATH]);
  
  	spin_unlock_irqrestore(&queue_group->submit_lock[RAID_PATH], flags);
  }
  
  static void pqi_acknowledge_event(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_event *event)
  {
  	struct pqi_event_acknowledge_request request;
  
  	memset(&request, 0, sizeof(request));
  
  	request.header.iu_type = PQI_REQUEST_IU_ACKNOWLEDGE_VENDOR_EVENT;
  	put_unaligned_le16(sizeof(request) - PQI_REQUEST_HEADER_LENGTH,
  		&request.header.iu_length);
  	request.event_type = event->event_type;
  	request.event_id = event->event_id;
  	request.additional_event_id = event->additional_event_id;
  
  	pqi_send_event_ack(ctrl_info, &request, sizeof(request));
  }
  
  static void pqi_event_worker(struct work_struct *work)
  {
  	unsigned int i;
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_event *event;
  
  	ctrl_info = container_of(work, struct pqi_ctrl_info, event_work);
  
  	pqi_ctrl_busy(ctrl_info);
  	pqi_wait_if_ctrl_blocked(ctrl_info, NO_TIMEOUT);
  	if (pqi_ctrl_offline(ctrl_info))
  		goto out;
  
  	pqi_schedule_rescan_worker_delayed(ctrl_info);
  
  	event = ctrl_info->events;
  	for (i = 0; i < PQI_NUM_SUPPORTED_EVENTS; i++) {
  		if (event->pending) {
  			event->pending = false;
  			pqi_acknowledge_event(ctrl_info, event);
  		}
  		event++;
  	}
  
  out:
  	pqi_ctrl_unbusy(ctrl_info);
  }
  
  #define PQI_HEARTBEAT_TIMER_INTERVAL	(10 * HZ)
  
  static void pqi_heartbeat_timer_handler(struct timer_list *t)
  {
  	int num_interrupts;
  	u32 heartbeat_count;
  	struct pqi_ctrl_info *ctrl_info = from_timer(ctrl_info, t,
  						     heartbeat_timer);
  
  	pqi_check_ctrl_health(ctrl_info);
  	if (pqi_ctrl_offline(ctrl_info))
  		return;
  
  	num_interrupts = atomic_read(&ctrl_info->num_interrupts);
  	heartbeat_count = pqi_read_heartbeat_counter(ctrl_info);
  
  	if (num_interrupts == ctrl_info->previous_num_interrupts) {
  		if (heartbeat_count == ctrl_info->previous_heartbeat_count) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"no heartbeat detected - last heartbeat count: %u\n",
  				heartbeat_count);
  			pqi_take_ctrl_offline(ctrl_info);
  			return;
  		}
  	} else {
  		ctrl_info->previous_num_interrupts = num_interrupts;
  	}
  
  	ctrl_info->previous_heartbeat_count = heartbeat_count;
  	mod_timer(&ctrl_info->heartbeat_timer,
  		jiffies + PQI_HEARTBEAT_TIMER_INTERVAL);
  }
  
  static void pqi_start_heartbeat_timer(struct pqi_ctrl_info *ctrl_info)
  {
  	if (!ctrl_info->heartbeat_counter)
  		return;
  
  	ctrl_info->previous_num_interrupts =
  		atomic_read(&ctrl_info->num_interrupts);
  	ctrl_info->previous_heartbeat_count =
  		pqi_read_heartbeat_counter(ctrl_info);
  
  	ctrl_info->heartbeat_timer.expires =
  		jiffies + PQI_HEARTBEAT_TIMER_INTERVAL;
  	add_timer(&ctrl_info->heartbeat_timer);
  }
  
  static inline void pqi_stop_heartbeat_timer(struct pqi_ctrl_info *ctrl_info)
  {
  	del_timer_sync(&ctrl_info->heartbeat_timer);
  }
  
  static inline int pqi_event_type_to_event_index(unsigned int event_type)
  {
  	int index;
  
  	for (index = 0; index < ARRAY_SIZE(pqi_supported_event_types); index++)
  		if (event_type == pqi_supported_event_types[index])
  			return index;
  
  	return -1;
  }
  
  static inline bool pqi_is_supported_event(unsigned int event_type)
  {
  	return pqi_event_type_to_event_index(event_type) != -1;
  }
  
  static unsigned int pqi_process_event_intr(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int num_events;
  	pqi_index_t oq_pi;
  	pqi_index_t oq_ci;
  	struct pqi_event_queue *event_queue;
  	struct pqi_event_response *response;
  	struct pqi_event *event;
  	int event_index;
  
  	event_queue = &ctrl_info->event_queue;
  	num_events = 0;
  	oq_ci = event_queue->oq_ci_copy;
  
  	while (1) {
  		oq_pi = *event_queue->oq_pi;
  		if (oq_pi == oq_ci)
  			break;
  
  		num_events++;
  		response = event_queue->oq_element_array +
  			(oq_ci * PQI_EVENT_OQ_ELEMENT_LENGTH);
  
  		event_index =
  			pqi_event_type_to_event_index(response->event_type);
  
  		if (event_index >= 0) {
  			if (response->request_acknowlege) {
  				event = &ctrl_info->events[event_index];
  				event->pending = true;
  				event->event_type = response->event_type;
  				event->event_id = response->event_id;
  				event->additional_event_id =
  					response->additional_event_id;
  			}
  		}
  
  		oq_ci = (oq_ci + 1) % PQI_NUM_EVENT_QUEUE_ELEMENTS;
  	}
  
  	if (num_events) {
  		event_queue->oq_ci_copy = oq_ci;
  		writel(oq_ci, event_queue->oq_ci);
  		schedule_work(&ctrl_info->event_work);
  	}
  
  	return num_events;
  }
  
  #define PQI_LEGACY_INTX_MASK	0x1
  
  static inline void pqi_configure_legacy_intx(struct pqi_ctrl_info *ctrl_info,
  						bool enable_intx)
  {
  	u32 intx_mask;
  	struct pqi_device_registers __iomem *pqi_registers;
  	volatile void __iomem *register_addr;
  
  	pqi_registers = ctrl_info->pqi_registers;
  
  	if (enable_intx)
  		register_addr = &pqi_registers->legacy_intx_mask_clear;
  	else
  		register_addr = &pqi_registers->legacy_intx_mask_set;
  
  	intx_mask = readl(register_addr);
  	intx_mask |= PQI_LEGACY_INTX_MASK;
  	writel(intx_mask, register_addr);
  }
  
  static void pqi_change_irq_mode(struct pqi_ctrl_info *ctrl_info,
  	enum pqi_irq_mode new_mode)
  {
  	switch (ctrl_info->irq_mode) {
  	case IRQ_MODE_MSIX:
  		switch (new_mode) {
  		case IRQ_MODE_MSIX:
  			break;
  		case IRQ_MODE_INTX:
  			pqi_configure_legacy_intx(ctrl_info, true);
  			sis_enable_intx(ctrl_info);
  			break;
  		case IRQ_MODE_NONE:
  			break;
  		}
  		break;
  	case IRQ_MODE_INTX:
  		switch (new_mode) {
  		case IRQ_MODE_MSIX:
  			pqi_configure_legacy_intx(ctrl_info, false);
  			sis_enable_msix(ctrl_info);
  			break;
  		case IRQ_MODE_INTX:
  			break;
  		case IRQ_MODE_NONE:
  			pqi_configure_legacy_intx(ctrl_info, false);
  			break;
  		}
  		break;
  	case IRQ_MODE_NONE:
  		switch (new_mode) {
  		case IRQ_MODE_MSIX:
  			sis_enable_msix(ctrl_info);
  			break;
  		case IRQ_MODE_INTX:
  			pqi_configure_legacy_intx(ctrl_info, true);
  			sis_enable_intx(ctrl_info);
  			break;
  		case IRQ_MODE_NONE:
  			break;
  		}
  		break;
  	}
  
  	ctrl_info->irq_mode = new_mode;
  }
  
  #define PQI_LEGACY_INTX_PENDING		0x1
  
  static inline bool pqi_is_valid_irq(struct pqi_ctrl_info *ctrl_info)
  {
  	bool valid_irq;
  	u32 intx_status;
  
  	switch (ctrl_info->irq_mode) {
  	case IRQ_MODE_MSIX:
  		valid_irq = true;
  		break;
  	case IRQ_MODE_INTX:
  		intx_status =
  			readl(&ctrl_info->pqi_registers->legacy_intx_status);
  		if (intx_status & PQI_LEGACY_INTX_PENDING)
  			valid_irq = true;
  		else
  			valid_irq = false;
  		break;
  	case IRQ_MODE_NONE:
  	default:
  		valid_irq = false;
  		break;
  	}
  
  	return valid_irq;
  }
  
  static irqreturn_t pqi_irq_handler(int irq, void *data)
  {
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_queue_group *queue_group;
  	unsigned int num_responses_handled;
  
  	queue_group = data;
  	ctrl_info = queue_group->ctrl_info;
  
  	if (!pqi_is_valid_irq(ctrl_info))
  		return IRQ_NONE;
  
  	num_responses_handled = pqi_process_io_intr(ctrl_info, queue_group);
  
  	if (irq == ctrl_info->event_irq)
  		num_responses_handled += pqi_process_event_intr(ctrl_info);
  
  	if (num_responses_handled)
  		atomic_inc(&ctrl_info->num_interrupts);
  
  	pqi_start_io(ctrl_info, queue_group, RAID_PATH, NULL);
  	pqi_start_io(ctrl_info, queue_group, AIO_PATH, NULL);
  
  	return IRQ_HANDLED;
  }
  
  static int pqi_request_irqs(struct pqi_ctrl_info *ctrl_info)
  {
  	struct pci_dev *pci_dev = ctrl_info->pci_dev;
  	int i;
  	int rc;
  
  	ctrl_info->event_irq = pci_irq_vector(pci_dev, 0);
  
  	for (i = 0; i < ctrl_info->num_msix_vectors_enabled; i++) {
  		rc = request_irq(pci_irq_vector(pci_dev, i), pqi_irq_handler, 0,
  			DRIVER_NAME_SHORT, &ctrl_info->queue_groups[i]);
  		if (rc) {
  			dev_err(&pci_dev->dev,
  				"irq %u init failed with error %d\n",
  				pci_irq_vector(pci_dev, i), rc);
  			return rc;
  		}
  		ctrl_info->num_msix_vectors_initialized++;
  	}
  
  	return 0;
  }
  
  static void pqi_free_irqs(struct pqi_ctrl_info *ctrl_info)
  {
  	int i;
  
  	for (i = 0; i < ctrl_info->num_msix_vectors_initialized; i++)
  		free_irq(pci_irq_vector(ctrl_info->pci_dev, i),
  			&ctrl_info->queue_groups[i]);
  
  	ctrl_info->num_msix_vectors_initialized = 0;
  }
  
  static int pqi_enable_msix_interrupts(struct pqi_ctrl_info *ctrl_info)
  {
  	int num_vectors_enabled;
  
  	num_vectors_enabled = pci_alloc_irq_vectors(ctrl_info->pci_dev,
  			PQI_MIN_MSIX_VECTORS, ctrl_info->num_queue_groups,
  			PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
  	if (num_vectors_enabled < 0) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"MSI-X init failed with error %d\n",
  			num_vectors_enabled);
  		return num_vectors_enabled;
  	}
  
  	ctrl_info->num_msix_vectors_enabled = num_vectors_enabled;
  	ctrl_info->irq_mode = IRQ_MODE_MSIX;
  	return 0;
  }
  
  static void pqi_disable_msix_interrupts(struct pqi_ctrl_info *ctrl_info)
  {
  	if (ctrl_info->num_msix_vectors_enabled) {
  		pci_free_irq_vectors(ctrl_info->pci_dev);
  		ctrl_info->num_msix_vectors_enabled = 0;
  	}
  }
  
  static int pqi_alloc_operational_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	size_t alloc_length;
  	size_t element_array_length_per_iq;
  	size_t element_array_length_per_oq;
  	void *element_array;
  	void *next_queue_index;
  	void *aligned_pointer;
  	unsigned int num_inbound_queues;
  	unsigned int num_outbound_queues;
  	unsigned int num_queue_indexes;
  	struct pqi_queue_group *queue_group;
  
  	element_array_length_per_iq =
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH *
  		ctrl_info->num_elements_per_iq;
  	element_array_length_per_oq =
  		PQI_OPERATIONAL_OQ_ELEMENT_LENGTH *
  		ctrl_info->num_elements_per_oq;
  	num_inbound_queues = ctrl_info->num_queue_groups * 2;
  	num_outbound_queues = ctrl_info->num_queue_groups;
  	num_queue_indexes = (ctrl_info->num_queue_groups * 3) + 1;
  
  	aligned_pointer = NULL;
  
  	for (i = 0; i < num_inbound_queues; i++) {
  		aligned_pointer = PTR_ALIGN(aligned_pointer,
  			PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  		aligned_pointer += element_array_length_per_iq;
  	}
  
  	for (i = 0; i < num_outbound_queues; i++) {
  		aligned_pointer = PTR_ALIGN(aligned_pointer,
  			PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  		aligned_pointer += element_array_length_per_oq;
  	}
  
  	aligned_pointer = PTR_ALIGN(aligned_pointer,
  		PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  	aligned_pointer += PQI_NUM_EVENT_QUEUE_ELEMENTS *
  		PQI_EVENT_OQ_ELEMENT_LENGTH;
  
  	for (i = 0; i < num_queue_indexes; i++) {
  		aligned_pointer = PTR_ALIGN(aligned_pointer,
  			PQI_OPERATIONAL_INDEX_ALIGNMENT);
  		aligned_pointer += sizeof(pqi_index_t);
  	}
  
  	alloc_length = (size_t)aligned_pointer +
  		PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT;
  
  	alloc_length += PQI_EXTRA_SGL_MEMORY;
  
  	ctrl_info->queue_memory_base =
  		dma_zalloc_coherent(&ctrl_info->pci_dev->dev,
  			alloc_length,
  			&ctrl_info->queue_memory_base_dma_handle, GFP_KERNEL);
  
  	if (!ctrl_info->queue_memory_base)
  		return -ENOMEM;
  
  	ctrl_info->queue_memory_length = alloc_length;
  
  	element_array = PTR_ALIGN(ctrl_info->queue_memory_base,
  		PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		queue_group = &ctrl_info->queue_groups[i];
  		queue_group->iq_element_array[RAID_PATH] = element_array;
  		queue_group->iq_element_array_bus_addr[RAID_PATH] =
  			ctrl_info->queue_memory_base_dma_handle +
  				(element_array - ctrl_info->queue_memory_base);
  		element_array += element_array_length_per_iq;
  		element_array = PTR_ALIGN(element_array,
  			PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  		queue_group->iq_element_array[AIO_PATH] = element_array;
  		queue_group->iq_element_array_bus_addr[AIO_PATH] =
  			ctrl_info->queue_memory_base_dma_handle +
  			(element_array - ctrl_info->queue_memory_base);
  		element_array += element_array_length_per_iq;
  		element_array = PTR_ALIGN(element_array,
  			PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  	}
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		queue_group = &ctrl_info->queue_groups[i];
  		queue_group->oq_element_array = element_array;
  		queue_group->oq_element_array_bus_addr =
  			ctrl_info->queue_memory_base_dma_handle +
  			(element_array - ctrl_info->queue_memory_base);
  		element_array += element_array_length_per_oq;
  		element_array = PTR_ALIGN(element_array,
  			PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  	}
  
  	ctrl_info->event_queue.oq_element_array = element_array;
  	ctrl_info->event_queue.oq_element_array_bus_addr =
  		ctrl_info->queue_memory_base_dma_handle +
  		(element_array - ctrl_info->queue_memory_base);
  	element_array += PQI_NUM_EVENT_QUEUE_ELEMENTS *
  		PQI_EVENT_OQ_ELEMENT_LENGTH;
  
  	next_queue_index = PTR_ALIGN(element_array,
  		PQI_OPERATIONAL_INDEX_ALIGNMENT);
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		queue_group = &ctrl_info->queue_groups[i];
  		queue_group->iq_ci[RAID_PATH] = next_queue_index;
  		queue_group->iq_ci_bus_addr[RAID_PATH] =
  			ctrl_info->queue_memory_base_dma_handle +
  			(next_queue_index - ctrl_info->queue_memory_base);
  		next_queue_index += sizeof(pqi_index_t);
  		next_queue_index = PTR_ALIGN(next_queue_index,
  			PQI_OPERATIONAL_INDEX_ALIGNMENT);
  		queue_group->iq_ci[AIO_PATH] = next_queue_index;
  		queue_group->iq_ci_bus_addr[AIO_PATH] =
  			ctrl_info->queue_memory_base_dma_handle +
  			(next_queue_index - ctrl_info->queue_memory_base);
  		next_queue_index += sizeof(pqi_index_t);
  		next_queue_index = PTR_ALIGN(next_queue_index,
  			PQI_OPERATIONAL_INDEX_ALIGNMENT);
  		queue_group->oq_pi = next_queue_index;
  		queue_group->oq_pi_bus_addr =
  			ctrl_info->queue_memory_base_dma_handle +
  			(next_queue_index - ctrl_info->queue_memory_base);
  		next_queue_index += sizeof(pqi_index_t);
  		next_queue_index = PTR_ALIGN(next_queue_index,
  			PQI_OPERATIONAL_INDEX_ALIGNMENT);
  	}
  
  	ctrl_info->event_queue.oq_pi = next_queue_index;
  	ctrl_info->event_queue.oq_pi_bus_addr =
  		ctrl_info->queue_memory_base_dma_handle +
  		(next_queue_index - ctrl_info->queue_memory_base);
  
  	return 0;
  }
  
  static void pqi_init_operational_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	u16 next_iq_id = PQI_MIN_OPERATIONAL_QUEUE_ID;
  	u16 next_oq_id = PQI_MIN_OPERATIONAL_QUEUE_ID;
  
  	/*
  	 * Initialize the backpointers to the controller structure in
  	 * each operational queue group structure.
  	 */
  	for (i = 0; i < ctrl_info->num_queue_groups; i++)
  		ctrl_info->queue_groups[i].ctrl_info = ctrl_info;
  
  	/*
  	 * Assign IDs to all operational queues.  Note that the IDs
  	 * assigned to operational IQs are independent of the IDs
  	 * assigned to operational OQs.
  	 */
  	ctrl_info->event_queue.oq_id = next_oq_id++;
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		ctrl_info->queue_groups[i].iq_id[RAID_PATH] = next_iq_id++;
  		ctrl_info->queue_groups[i].iq_id[AIO_PATH] = next_iq_id++;
  		ctrl_info->queue_groups[i].oq_id = next_oq_id++;
  	}
  
  	/*
  	 * Assign MSI-X table entry indexes to all queues.  Note that the
  	 * interrupt for the event queue is shared with the first queue group.
  	 */
  	ctrl_info->event_queue.int_msg_num = 0;
  	for (i = 0; i < ctrl_info->num_queue_groups; i++)
  		ctrl_info->queue_groups[i].int_msg_num = i;
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		spin_lock_init(&ctrl_info->queue_groups[i].submit_lock[0]);
  		spin_lock_init(&ctrl_info->queue_groups[i].submit_lock[1]);
  		INIT_LIST_HEAD(&ctrl_info->queue_groups[i].request_list[0]);
  		INIT_LIST_HEAD(&ctrl_info->queue_groups[i].request_list[1]);
  	}
  }
  
  static int pqi_alloc_admin_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	size_t alloc_length;
  	struct pqi_admin_queues_aligned *admin_queues_aligned;
  	struct pqi_admin_queues *admin_queues;
  
  	alloc_length = sizeof(struct pqi_admin_queues_aligned) +
  		PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT;
  
  	ctrl_info->admin_queue_memory_base =
  		dma_zalloc_coherent(&ctrl_info->pci_dev->dev,
  			alloc_length,
  			&ctrl_info->admin_queue_memory_base_dma_handle,
  			GFP_KERNEL);
  
  	if (!ctrl_info->admin_queue_memory_base)
  		return -ENOMEM;
  
  	ctrl_info->admin_queue_memory_length = alloc_length;
  
  	admin_queues = &ctrl_info->admin_queues;
  	admin_queues_aligned = PTR_ALIGN(ctrl_info->admin_queue_memory_base,
  		PQI_QUEUE_ELEMENT_ARRAY_ALIGNMENT);
  	admin_queues->iq_element_array =
  		&admin_queues_aligned->iq_element_array;
  	admin_queues->oq_element_array =
  		&admin_queues_aligned->oq_element_array;
  	admin_queues->iq_ci = &admin_queues_aligned->iq_ci;
  	admin_queues->oq_pi = &admin_queues_aligned->oq_pi;
  
  	admin_queues->iq_element_array_bus_addr =
  		ctrl_info->admin_queue_memory_base_dma_handle +
  		(admin_queues->iq_element_array -
  		ctrl_info->admin_queue_memory_base);
  	admin_queues->oq_element_array_bus_addr =
  		ctrl_info->admin_queue_memory_base_dma_handle +
  		(admin_queues->oq_element_array -
  		ctrl_info->admin_queue_memory_base);
  	admin_queues->iq_ci_bus_addr =
  		ctrl_info->admin_queue_memory_base_dma_handle +
  		((void *)admin_queues->iq_ci -
  		ctrl_info->admin_queue_memory_base);
  	admin_queues->oq_pi_bus_addr =
  		ctrl_info->admin_queue_memory_base_dma_handle +
  		((void *)admin_queues->oq_pi -
  		ctrl_info->admin_queue_memory_base);
  
  	return 0;
  }
  
  #define PQI_ADMIN_QUEUE_CREATE_TIMEOUT_JIFFIES		HZ
  #define PQI_ADMIN_QUEUE_CREATE_POLL_INTERVAL_MSECS	1
  
  static int pqi_create_admin_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	struct pqi_device_registers __iomem *pqi_registers;
  	struct pqi_admin_queues *admin_queues;
  	unsigned long timeout;
  	u8 status;
  	u32 reg;
  
  	pqi_registers = ctrl_info->pqi_registers;
  	admin_queues = &ctrl_info->admin_queues;
  
  	writeq((u64)admin_queues->iq_element_array_bus_addr,
  		&pqi_registers->admin_iq_element_array_addr);
  	writeq((u64)admin_queues->oq_element_array_bus_addr,
  		&pqi_registers->admin_oq_element_array_addr);
  	writeq((u64)admin_queues->iq_ci_bus_addr,
  		&pqi_registers->admin_iq_ci_addr);
  	writeq((u64)admin_queues->oq_pi_bus_addr,
  		&pqi_registers->admin_oq_pi_addr);
  
  	reg = PQI_ADMIN_IQ_NUM_ELEMENTS |
  		(PQI_ADMIN_OQ_NUM_ELEMENTS) << 8 |
  		(admin_queues->int_msg_num << 16);
  	writel(reg, &pqi_registers->admin_iq_num_elements);
  	writel(PQI_CREATE_ADMIN_QUEUE_PAIR,
  		&pqi_registers->function_and_status_code);
  
  	timeout = PQI_ADMIN_QUEUE_CREATE_TIMEOUT_JIFFIES + jiffies;
  	while (1) {
  		status = readb(&pqi_registers->function_and_status_code);
  		if (status == PQI_STATUS_IDLE)
  			break;
  		if (time_after(jiffies, timeout))
  			return -ETIMEDOUT;
  		msleep(PQI_ADMIN_QUEUE_CREATE_POLL_INTERVAL_MSECS);
  	}
  
  	/*
  	 * The offset registers are not initialized to the correct
  	 * offsets until *after* the create admin queue pair command
  	 * completes successfully.
  	 */
  	admin_queues->iq_pi = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		readq(&pqi_registers->admin_iq_pi_offset);
  	admin_queues->oq_ci = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		readq(&pqi_registers->admin_oq_ci_offset);
  
  	return 0;
  }
  
  static void pqi_submit_admin_request(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_general_admin_request *request)
  {
  	struct pqi_admin_queues *admin_queues;
  	void *next_element;
  	pqi_index_t iq_pi;
  
  	admin_queues = &ctrl_info->admin_queues;
  	iq_pi = admin_queues->iq_pi_copy;
  
  	next_element = admin_queues->iq_element_array +
  		(iq_pi * PQI_ADMIN_IQ_ELEMENT_LENGTH);
  
  	memcpy(next_element, request, sizeof(*request));
  
  	iq_pi = (iq_pi + 1) % PQI_ADMIN_IQ_NUM_ELEMENTS;
  	admin_queues->iq_pi_copy = iq_pi;
  
  	/*
  	 * This write notifies the controller that an IU is available to be
  	 * processed.
  	 */
  	writel(iq_pi, admin_queues->iq_pi);
  }
  
  #define PQI_ADMIN_REQUEST_TIMEOUT_SECS	60
  
  static int pqi_poll_for_admin_response(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_general_admin_response *response)
  {
  	struct pqi_admin_queues *admin_queues;
  	pqi_index_t oq_pi;
  	pqi_index_t oq_ci;
  	unsigned long timeout;
  
  	admin_queues = &ctrl_info->admin_queues;
  	oq_ci = admin_queues->oq_ci_copy;
  
  	timeout = (PQI_ADMIN_REQUEST_TIMEOUT_SECS * HZ) + jiffies;
  
  	while (1) {
  		oq_pi = *admin_queues->oq_pi;
  		if (oq_pi != oq_ci)
  			break;
  		if (time_after(jiffies, timeout)) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"timed out waiting for admin response\n");
  			return -ETIMEDOUT;
  		}
  		if (!sis_is_firmware_running(ctrl_info))
  			return -ENXIO;
  		usleep_range(1000, 2000);
  	}
  
  	memcpy(response, admin_queues->oq_element_array +
  		(oq_ci * PQI_ADMIN_OQ_ELEMENT_LENGTH), sizeof(*response));
  
  	oq_ci = (oq_ci + 1) % PQI_ADMIN_OQ_NUM_ELEMENTS;
  	admin_queues->oq_ci_copy = oq_ci;
  	writel(oq_ci, admin_queues->oq_ci);
  
  	return 0;
  }
  
  static void pqi_start_io(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_queue_group *queue_group, enum pqi_io_path path,
  	struct pqi_io_request *io_request)
  {
  	struct pqi_io_request *next;
  	void *next_element;
  	pqi_index_t iq_pi;
  	pqi_index_t iq_ci;
  	size_t iu_length;
  	unsigned long flags;
  	unsigned int num_elements_needed;
  	unsigned int num_elements_to_end_of_queue;
  	size_t copy_count;
  	struct pqi_iu_header *request;
  
  	spin_lock_irqsave(&queue_group->submit_lock[path], flags);
  
  	if (io_request) {
  		io_request->queue_group = queue_group;
  		list_add_tail(&io_request->request_list_entry,
  			&queue_group->request_list[path]);
  	}
  
  	iq_pi = queue_group->iq_pi_copy[path];
  
  	list_for_each_entry_safe(io_request, next,
  		&queue_group->request_list[path], request_list_entry) {
  
  		request = io_request->iu;
  
  		iu_length = get_unaligned_le16(&request->iu_length) +
  			PQI_REQUEST_HEADER_LENGTH;
  		num_elements_needed =
  			DIV_ROUND_UP(iu_length,
  				PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  		iq_ci = *queue_group->iq_ci[path];
  
  		if (num_elements_needed > pqi_num_elements_free(iq_pi, iq_ci,
  			ctrl_info->num_elements_per_iq))
  			break;
  
  		put_unaligned_le16(queue_group->oq_id,
  			&request->response_queue_id);
  
  		next_element = queue_group->iq_element_array[path] +
  			(iq_pi * PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  		num_elements_to_end_of_queue =
  			ctrl_info->num_elements_per_iq - iq_pi;
  
  		if (num_elements_needed <= num_elements_to_end_of_queue) {
  			memcpy(next_element, request, iu_length);
  		} else {
  			copy_count = num_elements_to_end_of_queue *
  				PQI_OPERATIONAL_IQ_ELEMENT_LENGTH;
  			memcpy(next_element, request, copy_count);
  			memcpy(queue_group->iq_element_array[path],
  				(u8 *)request + copy_count,
  				iu_length - copy_count);
  		}
  
  		iq_pi = (iq_pi + num_elements_needed) %
  			ctrl_info->num_elements_per_iq;
  
  		list_del(&io_request->request_list_entry);
  	}
  
  	if (iq_pi != queue_group->iq_pi_copy[path]) {
  		queue_group->iq_pi_copy[path] = iq_pi;
  		/*
  		 * This write notifies the controller that one or more IUs are
  		 * available to be processed.
  		 */
  		writel(iq_pi, queue_group->iq_pi[path]);
  	}
  
  	spin_unlock_irqrestore(&queue_group->submit_lock[path], flags);
  }
  
  #define PQI_WAIT_FOR_COMPLETION_IO_TIMEOUT_SECS		10
  
  static int pqi_wait_for_completion_io(struct pqi_ctrl_info *ctrl_info,
  	struct completion *wait)
  {
  	int rc;
  
  	while (1) {
  		if (wait_for_completion_io_timeout(wait,
  			PQI_WAIT_FOR_COMPLETION_IO_TIMEOUT_SECS * HZ)) {
  			rc = 0;
  			break;
  		}
  
  		pqi_check_ctrl_health(ctrl_info);
  		if (pqi_ctrl_offline(ctrl_info)) {
  			rc = -ENXIO;
  			break;
  		}
  	}
  
  	return rc;
  }
  
  static void pqi_raid_synchronous_complete(struct pqi_io_request *io_request,
  	void *context)
  {
  	struct completion *waiting = context;
  
  	complete(waiting);
  }
  
  static int pqi_submit_raid_request_synchronous_with_io_request(
  	struct pqi_ctrl_info *ctrl_info, struct pqi_io_request *io_request,
  	unsigned long timeout_msecs)
  {
  	int rc = 0;
  	DECLARE_COMPLETION_ONSTACK(wait);
  
  	io_request->io_complete_callback = pqi_raid_synchronous_complete;
  	io_request->context = &wait;
  
  	pqi_start_io(ctrl_info,
  		&ctrl_info->queue_groups[PQI_DEFAULT_QUEUE_GROUP], RAID_PATH,
  		io_request);
  
  	if (timeout_msecs == NO_TIMEOUT) {
  		pqi_wait_for_completion_io(ctrl_info, &wait);
  	} else {
  		if (!wait_for_completion_io_timeout(&wait,
  			msecs_to_jiffies(timeout_msecs))) {
  			dev_warn(&ctrl_info->pci_dev->dev,
  				"command timed out\n");
  			rc = -ETIMEDOUT;
  		}
  	}
  
  	return rc;
  }
  
  static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_iu_header *request, unsigned int flags,
  	struct pqi_raid_error_info *error_info, unsigned long timeout_msecs)
  {
  	int rc;
  	struct pqi_io_request *io_request;
  	unsigned long start_jiffies;
  	unsigned long msecs_blocked;
  	size_t iu_length;
  
  	/*
  	 * Note that specifying PQI_SYNC_FLAGS_INTERRUPTABLE and a timeout value
  	 * are mutually exclusive.
  	 */
  
  	if (flags & PQI_SYNC_FLAGS_INTERRUPTABLE) {
  		if (down_interruptible(&ctrl_info->sync_request_sem))
  			return -ERESTARTSYS;
  	} else {
  		if (timeout_msecs == NO_TIMEOUT) {
  			down(&ctrl_info->sync_request_sem);
  		} else {
  			start_jiffies = jiffies;
  			if (down_timeout(&ctrl_info->sync_request_sem,
  				msecs_to_jiffies(timeout_msecs)))
  				return -ETIMEDOUT;
  			msecs_blocked =
  				jiffies_to_msecs(jiffies - start_jiffies);
  			if (msecs_blocked >= timeout_msecs)
  				return -ETIMEDOUT;
  			timeout_msecs -= msecs_blocked;
  		}
  	}
  
  	pqi_ctrl_busy(ctrl_info);
  	timeout_msecs = pqi_wait_if_ctrl_blocked(ctrl_info, timeout_msecs);
  	if (timeout_msecs == 0) {
  		rc = -ETIMEDOUT;
  		goto out;
  	}
  
  	if (pqi_ctrl_offline(ctrl_info)) {
  		rc = -ENXIO;
  		goto out;
  	}
  
  	io_request = pqi_alloc_io_request(ctrl_info);
  
  	put_unaligned_le16(io_request->index,
  		&(((struct pqi_raid_path_request *)request)->request_id));
  
  	if (request->iu_type == PQI_REQUEST_IU_RAID_PATH_IO)
  		((struct pqi_raid_path_request *)request)->error_index =
  			((struct pqi_raid_path_request *)request)->request_id;
  
  	iu_length = get_unaligned_le16(&request->iu_length) +
  		PQI_REQUEST_HEADER_LENGTH;
  	memcpy(io_request->iu, request, iu_length);
  
  	rc = pqi_submit_raid_request_synchronous_with_io_request(ctrl_info,
  		io_request, timeout_msecs);
  
  	if (error_info) {
  		if (io_request->error_info)
  			memcpy(error_info, io_request->error_info,
  				sizeof(*error_info));
  		else
  			memset(error_info, 0, sizeof(*error_info));
  	} else if (rc == 0 && io_request->error_info) {
  		u8 scsi_status;
  		struct pqi_raid_error_info *raid_error_info;
  
  		raid_error_info = io_request->error_info;
  		scsi_status = raid_error_info->status;
  
  		if (scsi_status == SAM_STAT_CHECK_CONDITION &&
  			raid_error_info->data_out_result ==
  			PQI_DATA_IN_OUT_UNDERFLOW)
  			scsi_status = SAM_STAT_GOOD;
  
  		if (scsi_status != SAM_STAT_GOOD)
  			rc = -EIO;
  	}
  
  	pqi_free_io_request(io_request);
  
  out:
  	pqi_ctrl_unbusy(ctrl_info);
  	up(&ctrl_info->sync_request_sem);
  
  	return rc;
  }
  
  static int pqi_validate_admin_response(
  	struct pqi_general_admin_response *response, u8 expected_function_code)
  {
  	if (response->header.iu_type != PQI_RESPONSE_IU_GENERAL_ADMIN)
  		return -EINVAL;
  
  	if (get_unaligned_le16(&response->header.iu_length) !=
  		PQI_GENERAL_ADMIN_IU_LENGTH)
  		return -EINVAL;
  
  	if (response->function_code != expected_function_code)
  		return -EINVAL;
  
  	if (response->status != PQI_GENERAL_ADMIN_STATUS_SUCCESS)
  		return -EINVAL;
  
  	return 0;
  }
  
  static int pqi_submit_admin_request_synchronous(
  	struct pqi_ctrl_info *ctrl_info,
  	struct pqi_general_admin_request *request,
  	struct pqi_general_admin_response *response)
  {
  	int rc;
  
  	pqi_submit_admin_request(ctrl_info, request);
  
  	rc = pqi_poll_for_admin_response(ctrl_info, response);
  
  	if (rc == 0)
  		rc = pqi_validate_admin_response(response,
  			request->function_code);
  
  	return rc;
  }
  
  static int pqi_report_device_capability(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct pqi_general_admin_request request;
  	struct pqi_general_admin_response response;
  	struct pqi_device_capability *capability;
  	struct pqi_iu_layer_descriptor *sop_iu_layer_descriptor;
  
  	capability = kmalloc(sizeof(*capability), GFP_KERNEL);
  	if (!capability)
  		return -ENOMEM;
  
  	memset(&request, 0, sizeof(request));
  
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code =
  		PQI_GENERAL_ADMIN_FUNCTION_REPORT_DEVICE_CAPABILITY;
  	put_unaligned_le32(sizeof(*capability),
  		&request.data.report_device_capability.buffer_length);
  
  	rc = pqi_map_single(ctrl_info->pci_dev,
  		&request.data.report_device_capability.sg_descriptor,
  		capability, sizeof(*capability),
  		PCI_DMA_FROMDEVICE);
  	if (rc)
  		goto out;
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  
  	pqi_pci_unmap(ctrl_info->pci_dev,
  		&request.data.report_device_capability.sg_descriptor, 1,
  		PCI_DMA_FROMDEVICE);
  
  	if (rc)
  		goto out;
  
  	if (response.status != PQI_GENERAL_ADMIN_STATUS_SUCCESS) {
  		rc = -EIO;
  		goto out;
  	}
  
  	ctrl_info->max_inbound_queues =
  		get_unaligned_le16(&capability->max_inbound_queues);
  	ctrl_info->max_elements_per_iq =
  		get_unaligned_le16(&capability->max_elements_per_iq);
  	ctrl_info->max_iq_element_length =
  		get_unaligned_le16(&capability->max_iq_element_length)
  		* 16;
  	ctrl_info->max_outbound_queues =
  		get_unaligned_le16(&capability->max_outbound_queues);
  	ctrl_info->max_elements_per_oq =
  		get_unaligned_le16(&capability->max_elements_per_oq);
  	ctrl_info->max_oq_element_length =
  		get_unaligned_le16(&capability->max_oq_element_length)
  		* 16;
  
  	sop_iu_layer_descriptor =
  		&capability->iu_layer_descriptors[PQI_PROTOCOL_SOP];
  
  	ctrl_info->max_inbound_iu_length_per_firmware =
  		get_unaligned_le16(
  			&sop_iu_layer_descriptor->max_inbound_iu_length);
  	ctrl_info->inbound_spanning_supported =
  		sop_iu_layer_descriptor->inbound_spanning_supported;
  	ctrl_info->outbound_spanning_supported =
  		sop_iu_layer_descriptor->outbound_spanning_supported;
  
  out:
  	kfree(capability);
  
  	return rc;
  }
  
  static int pqi_validate_device_capability(struct pqi_ctrl_info *ctrl_info)
  {
  	if (ctrl_info->max_iq_element_length <
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"max. inbound queue element length of %d is less than the required length of %d\n",
  			ctrl_info->max_iq_element_length,
  			PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  		return -EINVAL;
  	}
  
  	if (ctrl_info->max_oq_element_length <
  		PQI_OPERATIONAL_OQ_ELEMENT_LENGTH) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"max. outbound queue element length of %d is less than the required length of %d\n",
  			ctrl_info->max_oq_element_length,
  			PQI_OPERATIONAL_OQ_ELEMENT_LENGTH);
  		return -EINVAL;
  	}
  
  	if (ctrl_info->max_inbound_iu_length_per_firmware <
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"max. inbound IU length of %u is less than the min. required length of %d\n",
  			ctrl_info->max_inbound_iu_length_per_firmware,
  			PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  		return -EINVAL;
  	}
  
  	if (!ctrl_info->inbound_spanning_supported) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"the controller does not support inbound spanning\n");
  		return -EINVAL;
  	}
  
  	if (ctrl_info->outbound_spanning_supported) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"the controller supports outbound spanning but this driver does not\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int pqi_create_event_queue(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct pqi_event_queue *event_queue;
  	struct pqi_general_admin_request request;
  	struct pqi_general_admin_response response;
  
  	event_queue = &ctrl_info->event_queue;
  
  	/*
  	 * Create OQ (Outbound Queue - device to host queue) to dedicate
  	 * to events.
  	 */
  	memset(&request, 0, sizeof(request));
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code = PQI_GENERAL_ADMIN_FUNCTION_CREATE_OQ;
  	put_unaligned_le16(event_queue->oq_id,
  		&request.data.create_operational_oq.queue_id);
  	put_unaligned_le64((u64)event_queue->oq_element_array_bus_addr,
  		&request.data.create_operational_oq.element_array_addr);
  	put_unaligned_le64((u64)event_queue->oq_pi_bus_addr,
  		&request.data.create_operational_oq.pi_addr);
  	put_unaligned_le16(PQI_NUM_EVENT_QUEUE_ELEMENTS,
  		&request.data.create_operational_oq.num_elements);
  	put_unaligned_le16(PQI_EVENT_OQ_ELEMENT_LENGTH / 16,
  		&request.data.create_operational_oq.element_length);
  	request.data.create_operational_oq.queue_protocol = PQI_PROTOCOL_SOP;
  	put_unaligned_le16(event_queue->int_msg_num,
  		&request.data.create_operational_oq.int_msg_num);
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  	if (rc)
  		return rc;
  
  	event_queue->oq_ci = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		get_unaligned_le64(
  			&response.data.create_operational_oq.oq_ci_offset);
  
  	return 0;
  }
  
  static int pqi_create_queue_group(struct pqi_ctrl_info *ctrl_info,
  	unsigned int group_number)
  {
  	int rc;
  	struct pqi_queue_group *queue_group;
  	struct pqi_general_admin_request request;
  	struct pqi_general_admin_response response;
  
  	queue_group = &ctrl_info->queue_groups[group_number];
  
  	/*
  	 * Create IQ (Inbound Queue - host to device queue) for
  	 * RAID path.
  	 */
  	memset(&request, 0, sizeof(request));
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code = PQI_GENERAL_ADMIN_FUNCTION_CREATE_IQ;
  	put_unaligned_le16(queue_group->iq_id[RAID_PATH],
  		&request.data.create_operational_iq.queue_id);
  	put_unaligned_le64(
  		(u64)queue_group->iq_element_array_bus_addr[RAID_PATH],
  		&request.data.create_operational_iq.element_array_addr);
  	put_unaligned_le64((u64)queue_group->iq_ci_bus_addr[RAID_PATH],
  		&request.data.create_operational_iq.ci_addr);
  	put_unaligned_le16(ctrl_info->num_elements_per_iq,
  		&request.data.create_operational_iq.num_elements);
  	put_unaligned_le16(PQI_OPERATIONAL_IQ_ELEMENT_LENGTH / 16,
  		&request.data.create_operational_iq.element_length);
  	request.data.create_operational_iq.queue_protocol = PQI_PROTOCOL_SOP;
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating inbound RAID queue\n");
  		return rc;
  	}
  
  	queue_group->iq_pi[RAID_PATH] = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		get_unaligned_le64(
  			&response.data.create_operational_iq.iq_pi_offset);
  
  	/*
  	 * Create IQ (Inbound Queue - host to device queue) for
  	 * Advanced I/O (AIO) path.
  	 */
  	memset(&request, 0, sizeof(request));
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code = PQI_GENERAL_ADMIN_FUNCTION_CREATE_IQ;
  	put_unaligned_le16(queue_group->iq_id[AIO_PATH],
  		&request.data.create_operational_iq.queue_id);
  	put_unaligned_le64((u64)queue_group->
  		iq_element_array_bus_addr[AIO_PATH],
  		&request.data.create_operational_iq.element_array_addr);
  	put_unaligned_le64((u64)queue_group->iq_ci_bus_addr[AIO_PATH],
  		&request.data.create_operational_iq.ci_addr);
  	put_unaligned_le16(ctrl_info->num_elements_per_iq,
  		&request.data.create_operational_iq.num_elements);
  	put_unaligned_le16(PQI_OPERATIONAL_IQ_ELEMENT_LENGTH / 16,
  		&request.data.create_operational_iq.element_length);
  	request.data.create_operational_iq.queue_protocol = PQI_PROTOCOL_SOP;
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating inbound AIO queue\n");
  		return rc;
  	}
  
  	queue_group->iq_pi[AIO_PATH] = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		get_unaligned_le64(
  			&response.data.create_operational_iq.iq_pi_offset);
  
  	/*
  	 * Designate the 2nd IQ as the AIO path.  By default, all IQs are
  	 * assumed to be for RAID path I/O unless we change the queue's
  	 * property.
  	 */
  	memset(&request, 0, sizeof(request));
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code = PQI_GENERAL_ADMIN_FUNCTION_CHANGE_IQ_PROPERTY;
  	put_unaligned_le16(queue_group->iq_id[AIO_PATH],
  		&request.data.change_operational_iq_properties.queue_id);
  	put_unaligned_le32(PQI_IQ_PROPERTY_IS_AIO_QUEUE,
  		&request.data.change_operational_iq_properties.vendor_specific);
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error changing queue property\n");
  		return rc;
  	}
  
  	/*
  	 * Create OQ (Outbound Queue - device to host queue).
  	 */
  	memset(&request, 0, sizeof(request));
  	request.header.iu_type = PQI_REQUEST_IU_GENERAL_ADMIN;
  	put_unaligned_le16(PQI_GENERAL_ADMIN_IU_LENGTH,
  		&request.header.iu_length);
  	request.function_code = PQI_GENERAL_ADMIN_FUNCTION_CREATE_OQ;
  	put_unaligned_le16(queue_group->oq_id,
  		&request.data.create_operational_oq.queue_id);
  	put_unaligned_le64((u64)queue_group->oq_element_array_bus_addr,
  		&request.data.create_operational_oq.element_array_addr);
  	put_unaligned_le64((u64)queue_group->oq_pi_bus_addr,
  		&request.data.create_operational_oq.pi_addr);
  	put_unaligned_le16(ctrl_info->num_elements_per_oq,
  		&request.data.create_operational_oq.num_elements);
  	put_unaligned_le16(PQI_OPERATIONAL_OQ_ELEMENT_LENGTH / 16,
  		&request.data.create_operational_oq.element_length);
  	request.data.create_operational_oq.queue_protocol = PQI_PROTOCOL_SOP;
  	put_unaligned_le16(queue_group->int_msg_num,
  		&request.data.create_operational_oq.int_msg_num);
  
  	rc = pqi_submit_admin_request_synchronous(ctrl_info, &request,
  		&response);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating outbound queue\n");
  		return rc;
  	}
  
  	queue_group->oq_ci = ctrl_info->iomem_base +
  		PQI_DEVICE_REGISTERS_OFFSET +
  		get_unaligned_le64(
  			&response.data.create_operational_oq.oq_ci_offset);
  
  	return 0;
  }
  
  static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	unsigned int i;
  
  	rc = pqi_create_event_queue(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating event queue\n");
  		return rc;
  	}
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		rc = pqi_create_queue_group(ctrl_info, i);
  		if (rc) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"error creating queue group number %u/%u\n",
  				i, ctrl_info->num_queue_groups);
  			return rc;
  		}
  	}
  
  	return 0;
  }
  
  #define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH	\
  	(offsetof(struct pqi_event_config, descriptors) + \
  	(PQI_MAX_EVENT_DESCRIPTORS * sizeof(struct pqi_event_descriptor)))
  
  static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info,
  	bool enable_events)
  {
  	int rc;
  	unsigned int i;
  	struct pqi_event_config *event_config;
  	struct pqi_event_descriptor *event_descriptor;
  	struct pqi_general_management_request request;
  
  	event_config = kmalloc(PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH,
  		GFP_KERNEL);
  	if (!event_config)
  		return -ENOMEM;
  
  	memset(&request, 0, sizeof(request));
  
  	request.header.iu_type = PQI_REQUEST_IU_REPORT_VENDOR_EVENT_CONFIG;
  	put_unaligned_le16(offsetof(struct pqi_general_management_request,
  		data.report_event_configuration.sg_descriptors[1]) -
  		PQI_REQUEST_HEADER_LENGTH, &request.header.iu_length);
  	put_unaligned_le32(PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH,
  		&request.data.report_event_configuration.buffer_length);
  
  	rc = pqi_map_single(ctrl_info->pci_dev,
  		request.data.report_event_configuration.sg_descriptors,
  		event_config, PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH,
  		PCI_DMA_FROMDEVICE);
  	if (rc)
  		goto out;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header,
  		0, NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev,
  		request.data.report_event_configuration.sg_descriptors, 1,
  		PCI_DMA_FROMDEVICE);
  
  	if (rc)
  		goto out;
  
  	for (i = 0; i < event_config->num_event_descriptors; i++) {
  		event_descriptor = &event_config->descriptors[i];
  		if (enable_events &&
  			pqi_is_supported_event(event_descriptor->event_type))
  			put_unaligned_le16(ctrl_info->event_queue.oq_id,
  					&event_descriptor->oq_id);
  		else
  			put_unaligned_le16(0, &event_descriptor->oq_id);
  	}
  
  	memset(&request, 0, sizeof(request));
  
  	request.header.iu_type = PQI_REQUEST_IU_SET_VENDOR_EVENT_CONFIG;
  	put_unaligned_le16(offsetof(struct pqi_general_management_request,
  		data.report_event_configuration.sg_descriptors[1]) -
  		PQI_REQUEST_HEADER_LENGTH, &request.header.iu_length);
  	put_unaligned_le32(PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH,
  		&request.data.report_event_configuration.buffer_length);
  
  	rc = pqi_map_single(ctrl_info->pci_dev,
  		request.data.report_event_configuration.sg_descriptors,
  		event_config, PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH,
  		PCI_DMA_TODEVICE);
  	if (rc)
  		goto out;
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header, 0,
  		NULL, NO_TIMEOUT);
  
  	pqi_pci_unmap(ctrl_info->pci_dev,
  		request.data.report_event_configuration.sg_descriptors, 1,
  		PCI_DMA_TODEVICE);
  
  out:
  	kfree(event_config);
  
  	return rc;
  }
  
  static inline int pqi_enable_events(struct pqi_ctrl_info *ctrl_info)
  {
  	return pqi_configure_events(ctrl_info, true);
  }
  
  static inline int pqi_disable_events(struct pqi_ctrl_info *ctrl_info)
  {
  	return pqi_configure_events(ctrl_info, false);
  }
  
  static void pqi_free_all_io_requests(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	struct device *dev;
  	size_t sg_chain_buffer_length;
  	struct pqi_io_request *io_request;
  
  	if (!ctrl_info->io_request_pool)
  		return;
  
  	dev = &ctrl_info->pci_dev->dev;
  	sg_chain_buffer_length = ctrl_info->sg_chain_buffer_length;
  	io_request = ctrl_info->io_request_pool;
  
  	for (i = 0; i < ctrl_info->max_io_slots; i++) {
  		kfree(io_request->iu);
  		if (!io_request->sg_chain_buffer)
  			break;
  		dma_free_coherent(dev, sg_chain_buffer_length,
  			io_request->sg_chain_buffer,
  			io_request->sg_chain_buffer_dma_handle);
  		io_request++;
  	}
  
  	kfree(ctrl_info->io_request_pool);
  	ctrl_info->io_request_pool = NULL;
  }
  
  static inline int pqi_alloc_error_buffer(struct pqi_ctrl_info *ctrl_info)
  {
  	ctrl_info->error_buffer = dma_zalloc_coherent(&ctrl_info->pci_dev->dev,
  		ctrl_info->error_buffer_length,
  		&ctrl_info->error_buffer_dma_handle, GFP_KERNEL);
  
  	if (!ctrl_info->error_buffer)
  		return -ENOMEM;
  
  	return 0;
  }
  
  static int pqi_alloc_io_resources(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	void *sg_chain_buffer;
  	size_t sg_chain_buffer_length;
  	dma_addr_t sg_chain_buffer_dma_handle;
  	struct device *dev;
  	struct pqi_io_request *io_request;
  
  	ctrl_info->io_request_pool =
  		kcalloc(ctrl_info->max_io_slots,
  			sizeof(ctrl_info->io_request_pool[0]), GFP_KERNEL);
  
  	if (!ctrl_info->io_request_pool) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to allocate I/O request pool\n");
  		goto error;
  	}
  
  	dev = &ctrl_info->pci_dev->dev;
  	sg_chain_buffer_length = ctrl_info->sg_chain_buffer_length;
  	io_request = ctrl_info->io_request_pool;
  
  	for (i = 0; i < ctrl_info->max_io_slots; i++) {
  		io_request->iu =
  			kmalloc(ctrl_info->max_inbound_iu_length, GFP_KERNEL);
  
  		if (!io_request->iu) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"failed to allocate IU buffers\n");
  			goto error;
  		}
  
  		sg_chain_buffer = dma_alloc_coherent(dev,
  			sg_chain_buffer_length, &sg_chain_buffer_dma_handle,
  			GFP_KERNEL);
  
  		if (!sg_chain_buffer) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"failed to allocate PQI scatter-gather chain buffers\n");
  			goto error;
  		}
  
  		io_request->index = i;
  		io_request->sg_chain_buffer = sg_chain_buffer;
  		io_request->sg_chain_buffer_dma_handle =
  			sg_chain_buffer_dma_handle;
  		io_request++;
  	}
  
  	return 0;
  
  error:
  	pqi_free_all_io_requests(ctrl_info);
  
  	return -ENOMEM;
  }
  
  /*
   * Calculate required resources that are sized based on max. outstanding
   * requests and max. transfer size.
   */
  
  static void pqi_calculate_io_resources(struct pqi_ctrl_info *ctrl_info)
  {
  	u32 max_transfer_size;
  	u32 max_sg_entries;
  
  	ctrl_info->scsi_ml_can_queue =
  		ctrl_info->max_outstanding_requests - PQI_RESERVED_IO_SLOTS;
  	ctrl_info->max_io_slots = ctrl_info->max_outstanding_requests;
  
  	ctrl_info->error_buffer_length =
  		ctrl_info->max_io_slots * PQI_ERROR_BUFFER_ELEMENT_LENGTH;
  
  	if (reset_devices)
  		max_transfer_size = min(ctrl_info->max_transfer_size,
  			PQI_MAX_TRANSFER_SIZE_KDUMP);
  	else
  		max_transfer_size = min(ctrl_info->max_transfer_size,
  			PQI_MAX_TRANSFER_SIZE);
  
  	max_sg_entries = max_transfer_size / PAGE_SIZE;
  
  	/* +1 to cover when the buffer is not page-aligned. */
  	max_sg_entries++;
  
  	max_sg_entries = min(ctrl_info->max_sg_entries, max_sg_entries);
  
  	max_transfer_size = (max_sg_entries - 1) * PAGE_SIZE;
  
  	ctrl_info->sg_chain_buffer_length =
  		(max_sg_entries * sizeof(struct pqi_sg_descriptor)) +
  		PQI_EXTRA_SGL_MEMORY;
  	ctrl_info->sg_tablesize = max_sg_entries;
  	ctrl_info->max_sectors = max_transfer_size / 512;
  }
  
  static void pqi_calculate_queue_resources(struct pqi_ctrl_info *ctrl_info)
  {
  	int num_queue_groups;
  	u16 num_elements_per_iq;
  	u16 num_elements_per_oq;
  
  	if (reset_devices) {
  		num_queue_groups = 1;
  	} else {
  		int num_cpus;
  		int max_queue_groups;
  
  		max_queue_groups = min(ctrl_info->max_inbound_queues / 2,
  			ctrl_info->max_outbound_queues - 1);
  		max_queue_groups = min(max_queue_groups, PQI_MAX_QUEUE_GROUPS);
  
  		num_cpus = num_online_cpus();
  		num_queue_groups = min(num_cpus, ctrl_info->max_msix_vectors);
  		num_queue_groups = min(num_queue_groups, max_queue_groups);
  	}
  
  	ctrl_info->num_queue_groups = num_queue_groups;
  	ctrl_info->max_hw_queue_index = num_queue_groups - 1;
  
  	/*
  	 * Make sure that the max. inbound IU length is an even multiple
  	 * of our inbound element length.
  	 */
  	ctrl_info->max_inbound_iu_length =
  		(ctrl_info->max_inbound_iu_length_per_firmware /
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH) *
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH;
  
  	num_elements_per_iq =
  		(ctrl_info->max_inbound_iu_length /
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  	/* Add one because one element in each queue is unusable. */
  	num_elements_per_iq++;
  
  	num_elements_per_iq = min(num_elements_per_iq,
  		ctrl_info->max_elements_per_iq);
  
  	num_elements_per_oq = ((num_elements_per_iq - 1) * 2) + 1;
  	num_elements_per_oq = min(num_elements_per_oq,
  		ctrl_info->max_elements_per_oq);
  
  	ctrl_info->num_elements_per_iq = num_elements_per_iq;
  	ctrl_info->num_elements_per_oq = num_elements_per_oq;
  
  	ctrl_info->max_sg_per_iu =
  		((ctrl_info->max_inbound_iu_length -
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH) /
  		sizeof(struct pqi_sg_descriptor)) +
  		PQI_MAX_EMBEDDED_SG_DESCRIPTORS;
  }
  
  static inline void pqi_set_sg_descriptor(
  	struct pqi_sg_descriptor *sg_descriptor, struct scatterlist *sg)
  {
  	u64 address = (u64)sg_dma_address(sg);
  	unsigned int length = sg_dma_len(sg);
  
  	put_unaligned_le64(address, &sg_descriptor->address);
  	put_unaligned_le32(length, &sg_descriptor->length);
  	put_unaligned_le32(0, &sg_descriptor->flags);
  }
  
  static int pqi_build_raid_sg_list(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_raid_path_request *request, struct scsi_cmnd *scmd,
  	struct pqi_io_request *io_request)
  {
  	int i;
  	u16 iu_length;
  	int sg_count;
  	bool chained;
  	unsigned int num_sg_in_iu;
  	unsigned int max_sg_per_iu;
  	struct scatterlist *sg;
  	struct pqi_sg_descriptor *sg_descriptor;
  
  	sg_count = scsi_dma_map(scmd);
  	if (sg_count < 0)
  		return sg_count;
  
  	iu_length = offsetof(struct pqi_raid_path_request, sg_descriptors) -
  		PQI_REQUEST_HEADER_LENGTH;
  
  	if (sg_count == 0)
  		goto out;
  
  	sg = scsi_sglist(scmd);
  	sg_descriptor = request->sg_descriptors;
  	max_sg_per_iu = ctrl_info->max_sg_per_iu - 1;
  	chained = false;
  	num_sg_in_iu = 0;
  	i = 0;
  
  	while (1) {
  		pqi_set_sg_descriptor(sg_descriptor, sg);
  		if (!chained)
  			num_sg_in_iu++;
  		i++;
  		if (i == sg_count)
  			break;
  		sg_descriptor++;
  		if (i == max_sg_per_iu) {
  			put_unaligned_le64(
  				(u64)io_request->sg_chain_buffer_dma_handle,
  				&sg_descriptor->address);
  			put_unaligned_le32((sg_count - num_sg_in_iu)
  				* sizeof(*sg_descriptor),
  				&sg_descriptor->length);
  			put_unaligned_le32(CISS_SG_CHAIN,
  				&sg_descriptor->flags);
  			chained = true;
  			num_sg_in_iu++;
  			sg_descriptor = io_request->sg_chain_buffer;
  		}
  		sg = sg_next(sg);
  	}
  
  	put_unaligned_le32(CISS_SG_LAST, &sg_descriptor->flags);
  	request->partial = chained;
  	iu_length += num_sg_in_iu * sizeof(*sg_descriptor);
  
  out:
  	put_unaligned_le16(iu_length, &request->header.iu_length);
  
  	return 0;
  }
  
  static int pqi_build_aio_sg_list(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_aio_path_request *request, struct scsi_cmnd *scmd,
  	struct pqi_io_request *io_request)
  {
  	int i;
  	u16 iu_length;
  	int sg_count;
  	bool chained;
  	unsigned int num_sg_in_iu;
  	unsigned int max_sg_per_iu;
  	struct scatterlist *sg;
  	struct pqi_sg_descriptor *sg_descriptor;
  
  	sg_count = scsi_dma_map(scmd);
  	if (sg_count < 0)
  		return sg_count;
  
  	iu_length = offsetof(struct pqi_aio_path_request, sg_descriptors) -
  		PQI_REQUEST_HEADER_LENGTH;
  	num_sg_in_iu = 0;
  
  	if (sg_count == 0)
  		goto out;
  
  	sg = scsi_sglist(scmd);
  	sg_descriptor = request->sg_descriptors;
  	max_sg_per_iu = ctrl_info->max_sg_per_iu - 1;
  	chained = false;
  	i = 0;
  
  	while (1) {
  		pqi_set_sg_descriptor(sg_descriptor, sg);
  		if (!chained)
  			num_sg_in_iu++;
  		i++;
  		if (i == sg_count)
  			break;
  		sg_descriptor++;
  		if (i == max_sg_per_iu) {
  			put_unaligned_le64(
  				(u64)io_request->sg_chain_buffer_dma_handle,
  				&sg_descriptor->address);
  			put_unaligned_le32((sg_count - num_sg_in_iu)
  				* sizeof(*sg_descriptor),
  				&sg_descriptor->length);
  			put_unaligned_le32(CISS_SG_CHAIN,
  				&sg_descriptor->flags);
  			chained = true;
  			num_sg_in_iu++;
  			sg_descriptor = io_request->sg_chain_buffer;
  		}
  		sg = sg_next(sg);
  	}
  
  	put_unaligned_le32(CISS_SG_LAST, &sg_descriptor->flags);
  	request->partial = chained;
  	iu_length += num_sg_in_iu * sizeof(*sg_descriptor);
  
  out:
  	put_unaligned_le16(iu_length, &request->header.iu_length);
  	request->num_sg_descriptors = num_sg_in_iu;
  
  	return 0;
  }
  
  static void pqi_raid_io_complete(struct pqi_io_request *io_request,
  	void *context)
  {
  	struct scsi_cmnd *scmd;
  
  	scmd = io_request->scmd;
  	pqi_free_io_request(io_request);
  	scsi_dma_unmap(scmd);
  	pqi_scsi_done(scmd);
  }
  
  static int pqi_raid_submit_scsi_cmd_with_io_request(
  	struct pqi_ctrl_info *ctrl_info, struct pqi_io_request *io_request,
  	struct pqi_scsi_dev *device, struct scsi_cmnd *scmd,
  	struct pqi_queue_group *queue_group)
  {
  	int rc;
  	size_t cdb_length;
  	struct pqi_raid_path_request *request;
  
  	io_request->io_complete_callback = pqi_raid_io_complete;
  	io_request->scmd = scmd;
  
  	request = io_request->iu;
  	memset(request, 0,
  		offsetof(struct pqi_raid_path_request, sg_descriptors));
  
  	request->header.iu_type = PQI_REQUEST_IU_RAID_PATH_IO;
  	put_unaligned_le32(scsi_bufflen(scmd), &request->buffer_length);
  	request->task_attribute = SOP_TASK_ATTRIBUTE_SIMPLE;
  	put_unaligned_le16(io_request->index, &request->request_id);
  	request->error_index = request->request_id;
  	memcpy(request->lun_number, device->scsi3addr,
  		sizeof(request->lun_number));
  
  	cdb_length = min_t(size_t, scmd->cmd_len, sizeof(request->cdb));
  	memcpy(request->cdb, scmd->cmnd, cdb_length);
  
  	switch (cdb_length) {
  	case 6:
  	case 10:
  	case 12:
  	case 16:
  		/* No bytes in the Additional CDB bytes field */
  		request->additional_cdb_bytes_usage =
  			SOP_ADDITIONAL_CDB_BYTES_0;
  		break;
  	case 20:
  		/* 4 bytes in the Additional cdb field */
  		request->additional_cdb_bytes_usage =
  			SOP_ADDITIONAL_CDB_BYTES_4;
  		break;
  	case 24:
  		/* 8 bytes in the Additional cdb field */
  		request->additional_cdb_bytes_usage =
  			SOP_ADDITIONAL_CDB_BYTES_8;
  		break;
  	case 28:
  		/* 12 bytes in the Additional cdb field */
  		request->additional_cdb_bytes_usage =
  			SOP_ADDITIONAL_CDB_BYTES_12;
  		break;
  	case 32:
  	default:
  		/* 16 bytes in the Additional cdb field */
  		request->additional_cdb_bytes_usage =
  			SOP_ADDITIONAL_CDB_BYTES_16;
  		break;
  	}
  
  	switch (scmd->sc_data_direction) {
  	case DMA_TO_DEVICE:
  		request->data_direction = SOP_READ_FLAG;
  		break;
  	case DMA_FROM_DEVICE:
  		request->data_direction = SOP_WRITE_FLAG;
  		break;
  	case DMA_NONE:
  		request->data_direction = SOP_NO_DIRECTION_FLAG;
  		break;
  	case DMA_BIDIRECTIONAL:
  		request->data_direction = SOP_BIDIRECTIONAL;
  		break;
  	default:
  		dev_err(&ctrl_info->pci_dev->dev,
  			"unknown data direction: %d\n",
  			scmd->sc_data_direction);
  		break;
  	}
  
  	rc = pqi_build_raid_sg_list(ctrl_info, request, scmd, io_request);
  	if (rc) {
  		pqi_free_io_request(io_request);
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  
  	pqi_start_io(ctrl_info, queue_group, RAID_PATH, io_request);
  
  	return 0;
  }
  
  static inline int pqi_raid_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device, struct scsi_cmnd *scmd,
  	struct pqi_queue_group *queue_group)
  {
  	struct pqi_io_request *io_request;
  
  	io_request = pqi_alloc_io_request(ctrl_info);
  
  	return pqi_raid_submit_scsi_cmd_with_io_request(ctrl_info, io_request,
  		device, scmd, queue_group);
  }
  
  static inline void pqi_schedule_bypass_retry(struct pqi_ctrl_info *ctrl_info)
  {
  	if (!pqi_ctrl_blocked(ctrl_info))
  		schedule_work(&ctrl_info->raid_bypass_retry_work);
  }
  
  static bool pqi_raid_bypass_retry_needed(struct pqi_io_request *io_request)
  {
  	struct scsi_cmnd *scmd;
  	struct pqi_scsi_dev *device;
  	struct pqi_ctrl_info *ctrl_info;
  
  	if (!io_request->raid_bypass)
  		return false;
  
  	scmd = io_request->scmd;
  	if ((scmd->result & 0xff) == SAM_STAT_GOOD)
  		return false;
  	if (host_byte(scmd->result) == DID_NO_CONNECT)
  		return false;
  
  	device = scmd->device->hostdata;
  	if (pqi_device_offline(device))
  		return false;
  
  	ctrl_info = shost_to_hba(scmd->device->host);
  	if (pqi_ctrl_offline(ctrl_info))
  		return false;
  
  	return true;
  }
  
  static inline void pqi_add_to_raid_bypass_retry_list(
  	struct pqi_ctrl_info *ctrl_info,
  	struct pqi_io_request *io_request, bool at_head)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctrl_info->raid_bypass_retry_list_lock, flags);
  	if (at_head)
  		list_add(&io_request->request_list_entry,
  			&ctrl_info->raid_bypass_retry_list);
  	else
  		list_add_tail(&io_request->request_list_entry,
  			&ctrl_info->raid_bypass_retry_list);
  	spin_unlock_irqrestore(&ctrl_info->raid_bypass_retry_list_lock, flags);
  }
  
  static void pqi_queued_raid_bypass_complete(struct pqi_io_request *io_request,
  	void *context)
  {
  	struct scsi_cmnd *scmd;
  
  	scmd = io_request->scmd;
  	pqi_free_io_request(io_request);
  	pqi_scsi_done(scmd);
  }
  
  static void pqi_queue_raid_bypass_retry(struct pqi_io_request *io_request)
  {
  	struct scsi_cmnd *scmd;
  	struct pqi_ctrl_info *ctrl_info;
  
  	io_request->io_complete_callback = pqi_queued_raid_bypass_complete;
  	scmd = io_request->scmd;
  	scmd->result = 0;
  	ctrl_info = shost_to_hba(scmd->device->host);
  
  	pqi_add_to_raid_bypass_retry_list(ctrl_info, io_request, false);
  	pqi_schedule_bypass_retry(ctrl_info);
  }
  
  static int pqi_retry_raid_bypass(struct pqi_io_request *io_request)
  {
  	struct scsi_cmnd *scmd;
  	struct pqi_scsi_dev *device;
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_queue_group *queue_group;
  
  	scmd = io_request->scmd;
  	device = scmd->device->hostdata;
  	if (pqi_device_in_reset(device)) {
  		pqi_free_io_request(io_request);
  		set_host_byte(scmd, DID_RESET);
  		pqi_scsi_done(scmd);
  		return 0;
  	}
  
  	ctrl_info = shost_to_hba(scmd->device->host);
  	queue_group = io_request->queue_group;
  
  	pqi_reinit_io_request(io_request);
  
  	return pqi_raid_submit_scsi_cmd_with_io_request(ctrl_info, io_request,
  		device, scmd, queue_group);
  }
  
  static inline struct pqi_io_request *pqi_next_queued_raid_bypass_request(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned long flags;
  	struct pqi_io_request *io_request;
  
  	spin_lock_irqsave(&ctrl_info->raid_bypass_retry_list_lock, flags);
  	io_request = list_first_entry_or_null(
  		&ctrl_info->raid_bypass_retry_list,
  		struct pqi_io_request, request_list_entry);
  	if (io_request)
  		list_del(&io_request->request_list_entry);
  	spin_unlock_irqrestore(&ctrl_info->raid_bypass_retry_list_lock, flags);
  
  	return io_request;
  }
  
  static void pqi_retry_raid_bypass_requests(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct pqi_io_request *io_request;
  
  	pqi_ctrl_busy(ctrl_info);
  
  	while (1) {
  		if (pqi_ctrl_blocked(ctrl_info))
  			break;
  		io_request = pqi_next_queued_raid_bypass_request(ctrl_info);
  		if (!io_request)
  			break;
  		rc = pqi_retry_raid_bypass(io_request);
  		if (rc) {
  			pqi_add_to_raid_bypass_retry_list(ctrl_info, io_request,
  				true);
  			pqi_schedule_bypass_retry(ctrl_info);
  			break;
  		}
  	}
  
  	pqi_ctrl_unbusy(ctrl_info);
  }
  
  static void pqi_raid_bypass_retry_worker(struct work_struct *work)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = container_of(work, struct pqi_ctrl_info,
  		raid_bypass_retry_work);
  	pqi_retry_raid_bypass_requests(ctrl_info);
  }
  
  static void pqi_clear_all_queued_raid_bypass_retries(
  	struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctrl_info->raid_bypass_retry_list_lock, flags);
  	INIT_LIST_HEAD(&ctrl_info->raid_bypass_retry_list);
  	spin_unlock_irqrestore(&ctrl_info->raid_bypass_retry_list_lock, flags);
  }
  
  static void pqi_aio_io_complete(struct pqi_io_request *io_request,
  	void *context)
  {
  	struct scsi_cmnd *scmd;
  
  	scmd = io_request->scmd;
  	scsi_dma_unmap(scmd);
  	if (io_request->status == -EAGAIN)
  		set_host_byte(scmd, DID_IMM_RETRY);
  	else if (pqi_raid_bypass_retry_needed(io_request)) {
  		pqi_queue_raid_bypass_retry(io_request);
  		return;
  	}
  	pqi_free_io_request(io_request);
  	pqi_scsi_done(scmd);
  }
  
  static inline int pqi_aio_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device, struct scsi_cmnd *scmd,
  	struct pqi_queue_group *queue_group)
  {
  	return pqi_aio_submit_io(ctrl_info, scmd, device->aio_handle,
  		scmd->cmnd, scmd->cmd_len, queue_group, NULL, false);
  }
  
  static int pqi_aio_submit_io(struct pqi_ctrl_info *ctrl_info,
  	struct scsi_cmnd *scmd, u32 aio_handle, u8 *cdb,
  	unsigned int cdb_length, struct pqi_queue_group *queue_group,
  	struct pqi_encryption_info *encryption_info, bool raid_bypass)
  {
  	int rc;
  	struct pqi_io_request *io_request;
  	struct pqi_aio_path_request *request;
  
  	io_request = pqi_alloc_io_request(ctrl_info);
  	io_request->io_complete_callback = pqi_aio_io_complete;
  	io_request->scmd = scmd;
  	io_request->raid_bypass = raid_bypass;
  
  	request = io_request->iu;
  	memset(request, 0,
  		offsetof(struct pqi_raid_path_request, sg_descriptors));
  
  	request->header.iu_type = PQI_REQUEST_IU_AIO_PATH_IO;
  	put_unaligned_le32(aio_handle, &request->nexus_id);
  	put_unaligned_le32(scsi_bufflen(scmd), &request->buffer_length);
  	request->task_attribute = SOP_TASK_ATTRIBUTE_SIMPLE;
  	put_unaligned_le16(io_request->index, &request->request_id);
  	request->error_index = request->request_id;
  	if (cdb_length > sizeof(request->cdb))
  		cdb_length = sizeof(request->cdb);
  	request->cdb_length = cdb_length;
  	memcpy(request->cdb, cdb, cdb_length);
  
  	switch (scmd->sc_data_direction) {
  	case DMA_TO_DEVICE:
  		request->data_direction = SOP_READ_FLAG;
  		break;
  	case DMA_FROM_DEVICE:
  		request->data_direction = SOP_WRITE_FLAG;
  		break;
  	case DMA_NONE:
  		request->data_direction = SOP_NO_DIRECTION_FLAG;
  		break;
  	case DMA_BIDIRECTIONAL:
  		request->data_direction = SOP_BIDIRECTIONAL;
  		break;
  	default:
  		dev_err(&ctrl_info->pci_dev->dev,
  			"unknown data direction: %d\n",
  			scmd->sc_data_direction);
  		break;
  	}
  
  	if (encryption_info) {
  		request->encryption_enable = true;
  		put_unaligned_le16(encryption_info->data_encryption_key_index,
  			&request->data_encryption_key_index);
  		put_unaligned_le32(encryption_info->encrypt_tweak_lower,
  			&request->encrypt_tweak_lower);
  		put_unaligned_le32(encryption_info->encrypt_tweak_upper,
  			&request->encrypt_tweak_upper);
  	}
  
  	rc = pqi_build_aio_sg_list(ctrl_info, request, scmd, io_request);
  	if (rc) {
  		pqi_free_io_request(io_request);
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  
  	pqi_start_io(ctrl_info, queue_group, AIO_PATH, io_request);
  
  	return 0;
  }
  
  static inline u16 pqi_get_hw_queue(struct pqi_ctrl_info *ctrl_info,
  	struct scsi_cmnd *scmd)
  {
  	u16 hw_queue;
  
  	hw_queue = blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(scmd->request));
  	if (hw_queue > ctrl_info->max_hw_queue_index)
  		hw_queue = 0;
  
  	return hw_queue;
  }
  
  /*
   * This function gets called just before we hand the completed SCSI request
   * back to the SML.
   */
  
  void pqi_prep_for_scsi_done(struct scsi_cmnd *scmd)
  {
  	struct pqi_scsi_dev *device;
  
  	device = scmd->device->hostdata;
  	atomic_dec(&device->scsi_cmds_outstanding);
  }
  
  static int pqi_scsi_queue_command(struct Scsi_Host *shost,
  	struct scsi_cmnd *scmd)
  {
  	int rc;
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_scsi_dev *device;
  	u16 hw_queue;
  	struct pqi_queue_group *queue_group;
  	bool raid_bypassed;
  
  	device = scmd->device->hostdata;
  	ctrl_info = shost_to_hba(shost);
  
  	atomic_inc(&device->scsi_cmds_outstanding);
  
  	if (pqi_ctrl_offline(ctrl_info)) {
  		set_host_byte(scmd, DID_NO_CONNECT);
  		pqi_scsi_done(scmd);
  		return 0;
  	}
  
  	pqi_ctrl_busy(ctrl_info);
  	if (pqi_ctrl_blocked(ctrl_info) || pqi_device_in_reset(device)) {
  		rc = SCSI_MLQUEUE_HOST_BUSY;
  		goto out;
  	}
  
  	/*
  	 * This is necessary because the SML doesn't zero out this field during
  	 * error recovery.
  	 */
  	scmd->result = 0;
  
  	hw_queue = pqi_get_hw_queue(ctrl_info, scmd);
  	queue_group = &ctrl_info->queue_groups[hw_queue];
  
  	if (pqi_is_logical_device(device)) {
  		raid_bypassed = false;
  		if (device->raid_bypass_enabled &&
  				!blk_rq_is_passthrough(scmd->request)) {
  			rc = pqi_raid_bypass_submit_scsi_cmd(ctrl_info, device,
  				scmd, queue_group);
  			if (rc == 0 || rc == SCSI_MLQUEUE_HOST_BUSY)
  				raid_bypassed = true;
  		}
  		if (!raid_bypassed)
  			rc = pqi_raid_submit_scsi_cmd(ctrl_info, device, scmd,
  				queue_group);
  	} else {
  		if (device->aio_enabled)
  			rc = pqi_aio_submit_scsi_cmd(ctrl_info, device, scmd,
  				queue_group);
  		else
  			rc = pqi_raid_submit_scsi_cmd(ctrl_info, device, scmd,
  				queue_group);
  	}
  
  out:
  	pqi_ctrl_unbusy(ctrl_info);
  	if (rc)
  		atomic_dec(&device->scsi_cmds_outstanding);
  
  	return rc;
  }
  
  static int pqi_wait_until_queued_io_drained(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_queue_group *queue_group)
  {
  	unsigned int path;
  	unsigned long flags;
  	bool list_is_empty;
  
  	for (path = 0; path < 2; path++) {
  		while (1) {
  			spin_lock_irqsave(
  				&queue_group->submit_lock[path], flags);
  			list_is_empty =
  				list_empty(&queue_group->request_list[path]);
  			spin_unlock_irqrestore(
  				&queue_group->submit_lock[path], flags);
  			if (list_is_empty)
  				break;
  			pqi_check_ctrl_health(ctrl_info);
  			if (pqi_ctrl_offline(ctrl_info))
  				return -ENXIO;
  			usleep_range(1000, 2000);
  		}
  	}
  
  	return 0;
  }
  
  static int pqi_wait_until_inbound_queues_empty(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	unsigned int i;
  	unsigned int path;
  	struct pqi_queue_group *queue_group;
  	pqi_index_t iq_pi;
  	pqi_index_t iq_ci;
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		queue_group = &ctrl_info->queue_groups[i];
  
  		rc = pqi_wait_until_queued_io_drained(ctrl_info, queue_group);
  		if (rc)
  			return rc;
  
  		for (path = 0; path < 2; path++) {
  			iq_pi = queue_group->iq_pi_copy[path];
  
  			while (1) {
  				iq_ci = *queue_group->iq_ci[path];
  				if (iq_ci == iq_pi)
  					break;
  				pqi_check_ctrl_health(ctrl_info);
  				if (pqi_ctrl_offline(ctrl_info))
  					return -ENXIO;
  				usleep_range(1000, 2000);
  			}
  		}
  	}
  
  	return 0;
  }
  
  static void pqi_fail_io_queued_for_device(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	unsigned int i;
  	unsigned int path;
  	struct pqi_queue_group *queue_group;
  	unsigned long flags;
  	struct pqi_io_request *io_request;
  	struct pqi_io_request *next;
  	struct scsi_cmnd *scmd;
  	struct pqi_scsi_dev *scsi_device;
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		queue_group = &ctrl_info->queue_groups[i];
  
  		for (path = 0; path < 2; path++) {
  			spin_lock_irqsave(
  				&queue_group->submit_lock[path], flags);
  
  			list_for_each_entry_safe(io_request, next,
  				&queue_group->request_list[path],
  				request_list_entry) {
  				scmd = io_request->scmd;
  				if (!scmd)
  					continue;
  
  				scsi_device = scmd->device->hostdata;
  				if (scsi_device != device)
  					continue;
  
  				list_del(&io_request->request_list_entry);
  				set_host_byte(scmd, DID_RESET);
  				pqi_scsi_done(scmd);
  			}
  
  			spin_unlock_irqrestore(
  				&queue_group->submit_lock[path], flags);
  		}
  	}
  }
  
  static int pqi_device_wait_for_pending_io(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	while (atomic_read(&device->scsi_cmds_outstanding)) {
  		pqi_check_ctrl_health(ctrl_info);
  		if (pqi_ctrl_offline(ctrl_info))
  			return -ENXIO;
  		usleep_range(1000, 2000);
  	}
  
  	return 0;
  }
  
  static int pqi_ctrl_wait_for_pending_io(struct pqi_ctrl_info *ctrl_info)
  {
  	bool io_pending;
  	unsigned long flags;
  	struct pqi_scsi_dev *device;
  
  	while (1) {
  		io_pending = false;
  
  		spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  		list_for_each_entry(device, &ctrl_info->scsi_device_list,
  			scsi_device_list_entry) {
  			if (atomic_read(&device->scsi_cmds_outstanding)) {
  				io_pending = true;
  				break;
  			}
  		}
  		spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock,
  					flags);
  
  		if (!io_pending)
  			break;
  
  		pqi_check_ctrl_health(ctrl_info);
  		if (pqi_ctrl_offline(ctrl_info))
  			return -ENXIO;
  
  		usleep_range(1000, 2000);
  	}
  
  	return 0;
  }
  
  static void pqi_lun_reset_complete(struct pqi_io_request *io_request,
  	void *context)
  {
  	struct completion *waiting = context;
  
  	complete(waiting);
  }
  
  #define PQI_LUN_RESET_TIMEOUT_SECS	10
  
  static int pqi_wait_for_lun_reset_completion(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device, struct completion *wait)
  {
  	int rc;
  
  	while (1) {
  		if (wait_for_completion_io_timeout(wait,
  			PQI_LUN_RESET_TIMEOUT_SECS * HZ)) {
  			rc = 0;
  			break;
  		}
  
  		pqi_check_ctrl_health(ctrl_info);
  		if (pqi_ctrl_offline(ctrl_info)) {
  			rc = -ENXIO;
  			break;
  		}
  	}
  
  	return rc;
  }
  
  static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  	struct pqi_io_request *io_request;
  	DECLARE_COMPLETION_ONSTACK(wait);
  	struct pqi_task_management_request *request;
  
  	io_request = pqi_alloc_io_request(ctrl_info);
  	io_request->io_complete_callback = pqi_lun_reset_complete;
  	io_request->context = &wait;
  
  	request = io_request->iu;
  	memset(request, 0, sizeof(*request));
  
  	request->header.iu_type = PQI_REQUEST_IU_TASK_MANAGEMENT;
  	put_unaligned_le16(sizeof(*request) - PQI_REQUEST_HEADER_LENGTH,
  		&request->header.iu_length);
  	put_unaligned_le16(io_request->index, &request->request_id);
  	memcpy(request->lun_number, device->scsi3addr,
  		sizeof(request->lun_number));
  	request->task_management_function = SOP_TASK_MANAGEMENT_LUN_RESET;
  
  	pqi_start_io(ctrl_info,
  		&ctrl_info->queue_groups[PQI_DEFAULT_QUEUE_GROUP], RAID_PATH,
  		io_request);
  
  	rc = pqi_wait_for_lun_reset_completion(ctrl_info, device, &wait);
  	if (rc == 0)
  		rc = io_request->status;
  
  	pqi_free_io_request(io_request);
  
  	return rc;
  }
  
  /* Performs a reset at the LUN level. */
  
  static int pqi_device_reset(struct pqi_ctrl_info *ctrl_info,
  	struct pqi_scsi_dev *device)
  {
  	int rc;
  
  	rc = pqi_lun_reset(ctrl_info, device);
  	if (rc == 0)
  		rc = pqi_device_wait_for_pending_io(ctrl_info, device);
  
  	return rc == 0 ? SUCCESS : FAILED;
  }
  
  static int pqi_eh_device_reset_handler(struct scsi_cmnd *scmd)
  {
  	int rc;
  	struct Scsi_Host *shost;
  	struct pqi_ctrl_info *ctrl_info;
  	struct pqi_scsi_dev *device;
  
  	shost = scmd->device->host;
  	ctrl_info = shost_to_hba(shost);
  	device = scmd->device->hostdata;
  
  	dev_err(&ctrl_info->pci_dev->dev,
  		"resetting scsi %d:%d:%d:%d\n",
  		shost->host_no, device->bus, device->target, device->lun);
  
  	pqi_check_ctrl_health(ctrl_info);
  	if (pqi_ctrl_offline(ctrl_info)) {
  		rc = FAILED;
  		goto out;
  	}
  
  	mutex_lock(&ctrl_info->lun_reset_mutex);
  
  	pqi_ctrl_block_requests(ctrl_info);
  	pqi_ctrl_wait_until_quiesced(ctrl_info);
  	pqi_fail_io_queued_for_device(ctrl_info, device);
  	rc = pqi_wait_until_inbound_queues_empty(ctrl_info);
  	pqi_device_reset_start(device);
  	pqi_ctrl_unblock_requests(ctrl_info);
  
  	if (rc)
  		rc = FAILED;
  	else
  		rc = pqi_device_reset(ctrl_info, device);
  
  	pqi_device_reset_done(device);
  
  	mutex_unlock(&ctrl_info->lun_reset_mutex);
  
  out:
  	dev_err(&ctrl_info->pci_dev->dev,
  		"reset of scsi %d:%d:%d:%d: %s\n",
  		shost->host_no, device->bus, device->target, device->lun,
  		rc == SUCCESS ? "SUCCESS" : "FAILED");
  
  	return rc;
  }
  
  static int pqi_slave_alloc(struct scsi_device *sdev)
  {
  	struct pqi_scsi_dev *device;
  	unsigned long flags;
  	struct pqi_ctrl_info *ctrl_info;
  	struct scsi_target *starget;
  	struct sas_rphy *rphy;
  
  	ctrl_info = shost_to_hba(sdev->host);
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  	if (sdev_channel(sdev) == PQI_PHYSICAL_DEVICE_BUS) {
  		starget = scsi_target(sdev);
  		rphy = target_to_rphy(starget);
  		device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
  		if (device) {
  			device->target = sdev_id(sdev);
  			device->lun = sdev->lun;
  			device->target_lun_valid = true;
  		}
  	} else {
  		device = pqi_find_scsi_dev(ctrl_info, sdev_channel(sdev),
  			sdev_id(sdev), sdev->lun);
  	}
  
  	if (device) {
  		sdev->hostdata = device;
  		device->sdev = sdev;
  		if (device->queue_depth) {
  			device->advertised_queue_depth = device->queue_depth;
  			scsi_change_queue_depth(sdev,
  				device->advertised_queue_depth);
  		}
  	}
  
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	return 0;
  }
  
  static int pqi_map_queues(struct Scsi_Host *shost)
  {
  	struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
  
  	return blk_mq_pci_map_queues(&shost->tag_set, ctrl_info->pci_dev, 0);
  }
  
  static int pqi_getpciinfo_ioctl(struct pqi_ctrl_info *ctrl_info,
  	void __user *arg)
  {
  	struct pci_dev *pci_dev;
  	u32 subsystem_vendor;
  	u32 subsystem_device;
  	cciss_pci_info_struct pciinfo;
  
  	if (!arg)
  		return -EINVAL;
  
  	pci_dev = ctrl_info->pci_dev;
  
  	pciinfo.domain = pci_domain_nr(pci_dev->bus);
  	pciinfo.bus = pci_dev->bus->number;
  	pciinfo.dev_fn = pci_dev->devfn;
  	subsystem_vendor = pci_dev->subsystem_vendor;
  	subsystem_device = pci_dev->subsystem_device;
  	pciinfo.board_id = ((subsystem_device << 16) & 0xffff0000) |
  		subsystem_vendor;
  
  	if (copy_to_user(arg, &pciinfo, sizeof(pciinfo)))
  		return -EFAULT;
  
  	return 0;
  }
  
  static int pqi_getdrivver_ioctl(void __user *arg)
  {
  	u32 version;
  
  	if (!arg)
  		return -EINVAL;
  
  	version = (DRIVER_MAJOR << 28) | (DRIVER_MINOR << 24) |
  		(DRIVER_RELEASE << 16) | DRIVER_REVISION;
  
  	if (copy_to_user(arg, &version, sizeof(version)))
  		return -EFAULT;
  
  	return 0;
  }
  
  struct ciss_error_info {
  	u8	scsi_status;
  	int	command_status;
  	size_t	sense_data_length;
  };
  
  static void pqi_error_info_to_ciss(struct pqi_raid_error_info *pqi_error_info,
  	struct ciss_error_info *ciss_error_info)
  {
  	int ciss_cmd_status;
  	size_t sense_data_length;
  
  	switch (pqi_error_info->data_out_result) {
  	case PQI_DATA_IN_OUT_GOOD:
  		ciss_cmd_status = CISS_CMD_STATUS_SUCCESS;
  		break;
  	case PQI_DATA_IN_OUT_UNDERFLOW:
  		ciss_cmd_status = CISS_CMD_STATUS_DATA_UNDERRUN;
  		break;
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW:
  		ciss_cmd_status = CISS_CMD_STATUS_DATA_OVERRUN;
  		break;
  	case PQI_DATA_IN_OUT_PROTOCOL_ERROR:
  	case PQI_DATA_IN_OUT_BUFFER_ERROR:
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW_DESCRIPTOR_AREA:
  	case PQI_DATA_IN_OUT_BUFFER_OVERFLOW_BRIDGE:
  	case PQI_DATA_IN_OUT_ERROR:
  		ciss_cmd_status = CISS_CMD_STATUS_PROTOCOL_ERROR;
  		break;
  	case PQI_DATA_IN_OUT_HARDWARE_ERROR:
  	case PQI_DATA_IN_OUT_PCIE_FABRIC_ERROR:
  	case PQI_DATA_IN_OUT_PCIE_COMPLETION_TIMEOUT:
  	case PQI_DATA_IN_OUT_PCIE_COMPLETER_ABORT_RECEIVED:
  	case PQI_DATA_IN_OUT_PCIE_UNSUPPORTED_REQUEST_RECEIVED:
  	case PQI_DATA_IN_OUT_PCIE_ECRC_CHECK_FAILED:
  	case PQI_DATA_IN_OUT_PCIE_UNSUPPORTED_REQUEST:
  	case PQI_DATA_IN_OUT_PCIE_ACS_VIOLATION:
  	case PQI_DATA_IN_OUT_PCIE_TLP_PREFIX_BLOCKED:
  	case PQI_DATA_IN_OUT_PCIE_POISONED_MEMORY_READ:
  		ciss_cmd_status = CISS_CMD_STATUS_HARDWARE_ERROR;
  		break;
  	case PQI_DATA_IN_OUT_UNSOLICITED_ABORT:
  		ciss_cmd_status = CISS_CMD_STATUS_UNSOLICITED_ABORT;
  		break;
  	case PQI_DATA_IN_OUT_ABORTED:
  		ciss_cmd_status = CISS_CMD_STATUS_ABORTED;
  		break;
  	case PQI_DATA_IN_OUT_TIMEOUT:
  		ciss_cmd_status = CISS_CMD_STATUS_TIMEOUT;
  		break;
  	default:
  		ciss_cmd_status = CISS_CMD_STATUS_TARGET_STATUS;
  		break;
  	}
  
  	sense_data_length =
  		get_unaligned_le16(&pqi_error_info->sense_data_length);
  	if (sense_data_length == 0)
  		sense_data_length =
  		get_unaligned_le16(&pqi_error_info->response_data_length);
  	if (sense_data_length)
  		if (sense_data_length > sizeof(pqi_error_info->data))
  			sense_data_length = sizeof(pqi_error_info->data);
  
  	ciss_error_info->scsi_status = pqi_error_info->status;
  	ciss_error_info->command_status = ciss_cmd_status;
  	ciss_error_info->sense_data_length = sense_data_length;
  }
  
  static int pqi_passthru_ioctl(struct pqi_ctrl_info *ctrl_info, void __user *arg)
  {
  	int rc;
  	char *kernel_buffer = NULL;
  	u16 iu_length;
  	size_t sense_data_length;
  	IOCTL_Command_struct iocommand;
  	struct pqi_raid_path_request request;
  	struct pqi_raid_error_info pqi_error_info;
  	struct ciss_error_info ciss_error_info;
  
  	if (pqi_ctrl_offline(ctrl_info))
  		return -ENXIO;
  	if (!arg)
  		return -EINVAL;
  	if (!capable(CAP_SYS_RAWIO))
  		return -EPERM;
  	if (copy_from_user(&iocommand, arg, sizeof(iocommand)))
  		return -EFAULT;
  	if (iocommand.buf_size < 1 &&
  		iocommand.Request.Type.Direction != XFER_NONE)
  		return -EINVAL;
  	if (iocommand.Request.CDBLen > sizeof(request.cdb))
  		return -EINVAL;
  	if (iocommand.Request.Type.Type != TYPE_CMD)
  		return -EINVAL;
  
  	switch (iocommand.Request.Type.Direction) {
  	case XFER_NONE:
  	case XFER_WRITE:
  	case XFER_READ:
  	case XFER_READ | XFER_WRITE:
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	if (iocommand.buf_size > 0) {
  		kernel_buffer = kmalloc(iocommand.buf_size, GFP_KERNEL);
  		if (!kernel_buffer)
  			return -ENOMEM;
  		if (iocommand.Request.Type.Direction & XFER_WRITE) {
  			if (copy_from_user(kernel_buffer, iocommand.buf,
  				iocommand.buf_size)) {
  				rc = -EFAULT;
  				goto out;
  			}
  		} else {
  			memset(kernel_buffer, 0, iocommand.buf_size);
  		}
  	}
  
  	memset(&request, 0, sizeof(request));
  
  	request.header.iu_type = PQI_REQUEST_IU_RAID_PATH_IO;
  	iu_length = offsetof(struct pqi_raid_path_request, sg_descriptors) -
  		PQI_REQUEST_HEADER_LENGTH;
  	memcpy(request.lun_number, iocommand.LUN_info.LunAddrBytes,
  		sizeof(request.lun_number));
  	memcpy(request.cdb, iocommand.Request.CDB, iocommand.Request.CDBLen);
  	request.additional_cdb_bytes_usage = SOP_ADDITIONAL_CDB_BYTES_0;
  
  	switch (iocommand.Request.Type.Direction) {
  	case XFER_NONE:
  		request.data_direction = SOP_NO_DIRECTION_FLAG;
  		break;
  	case XFER_WRITE:
  		request.data_direction = SOP_WRITE_FLAG;
  		break;
  	case XFER_READ:
  		request.data_direction = SOP_READ_FLAG;
  		break;
  	case XFER_READ | XFER_WRITE:
  		request.data_direction = SOP_BIDIRECTIONAL;
  		break;
  	}
  
  	request.task_attribute = SOP_TASK_ATTRIBUTE_SIMPLE;
  
  	if (iocommand.buf_size > 0) {
  		put_unaligned_le32(iocommand.buf_size, &request.buffer_length);
  
  		rc = pqi_map_single(ctrl_info->pci_dev,
  			&request.sg_descriptors[0], kernel_buffer,
  			iocommand.buf_size, PCI_DMA_BIDIRECTIONAL);
  		if (rc)
  			goto out;
  
  		iu_length += sizeof(request.sg_descriptors[0]);
  	}
  
  	put_unaligned_le16(iu_length, &request.header.iu_length);
  
  	rc = pqi_submit_raid_request_synchronous(ctrl_info, &request.header,
  		PQI_SYNC_FLAGS_INTERRUPTABLE, &pqi_error_info, NO_TIMEOUT);
  
  	if (iocommand.buf_size > 0)
  		pqi_pci_unmap(ctrl_info->pci_dev, request.sg_descriptors, 1,
  			PCI_DMA_BIDIRECTIONAL);
  
  	memset(&iocommand.error_info, 0, sizeof(iocommand.error_info));
  
  	if (rc == 0) {
  		pqi_error_info_to_ciss(&pqi_error_info, &ciss_error_info);
  		iocommand.error_info.ScsiStatus = ciss_error_info.scsi_status;
  		iocommand.error_info.CommandStatus =
  			ciss_error_info.command_status;
  		sense_data_length = ciss_error_info.sense_data_length;
  		if (sense_data_length) {
  			if (sense_data_length >
  				sizeof(iocommand.error_info.SenseInfo))
  				sense_data_length =
  					sizeof(iocommand.error_info.SenseInfo);
  			memcpy(iocommand.error_info.SenseInfo,
  				pqi_error_info.data, sense_data_length);
  			iocommand.error_info.SenseLen = sense_data_length;
  		}
  	}
  
  	if (copy_to_user(arg, &iocommand, sizeof(iocommand))) {
  		rc = -EFAULT;
  		goto out;
  	}
  
  	if (rc == 0 && iocommand.buf_size > 0 &&
  		(iocommand.Request.Type.Direction & XFER_READ)) {
  		if (copy_to_user(iocommand.buf, kernel_buffer,
  			iocommand.buf_size)) {
  			rc = -EFAULT;
  		}
  	}
  
  out:
  	kfree(kernel_buffer);
  
  	return rc;
  }
  
  static int pqi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
  {
  	int rc;
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = shost_to_hba(sdev->host);
  
  	switch (cmd) {
  	case CCISS_DEREGDISK:
  	case CCISS_REGNEWDISK:
  	case CCISS_REGNEWD:
  		rc = pqi_scan_scsi_devices(ctrl_info);
  		break;
  	case CCISS_GETPCIINFO:
  		rc = pqi_getpciinfo_ioctl(ctrl_info, arg);
  		break;
  	case CCISS_GETDRIVVER:
  		rc = pqi_getdrivver_ioctl(arg);
  		break;
  	case CCISS_PASSTHRU:
  		rc = pqi_passthru_ioctl(ctrl_info, arg);
  		break;
  	default:
  		rc = -EINVAL;
  		break;
  	}
  
  	return rc;
  }
  
  static ssize_t pqi_version_show(struct device *dev,
  	struct device_attribute *attr, char *buffer)
  {
  	ssize_t count = 0;
  	struct Scsi_Host *shost;
  	struct pqi_ctrl_info *ctrl_info;
  
  	shost = class_to_shost(dev);
  	ctrl_info = shost_to_hba(shost);
  
  	count += snprintf(buffer + count, PAGE_SIZE - count,
  		"  driver: %s\n", DRIVER_VERSION BUILD_TIMESTAMP);
  
  	count += snprintf(buffer + count, PAGE_SIZE - count,
  		"firmware: %s\n", ctrl_info->firmware_version);
  
  	return count;
  }
  
  static ssize_t pqi_host_rescan_store(struct device *dev,
  	struct device_attribute *attr, const char *buffer, size_t count)
  {
  	struct Scsi_Host *shost = class_to_shost(dev);
  
  	pqi_scan_start(shost);
  
  	return count;
  }
  
  static ssize_t pqi_lockup_action_show(struct device *dev,
  	struct device_attribute *attr, char *buffer)
  {
  	int count = 0;
  	unsigned int i;
  
  	for (i = 0; i < ARRAY_SIZE(pqi_lockup_actions); i++) {
  		if (pqi_lockup_actions[i].action == pqi_lockup_action)
  			count += snprintf(buffer + count, PAGE_SIZE - count,
  				"[%s] ", pqi_lockup_actions[i].name);
  		else
  			count += snprintf(buffer + count, PAGE_SIZE - count,
  				"%s ", pqi_lockup_actions[i].name);
  	}
  
  	count += snprintf(buffer + count, PAGE_SIZE - count, "\n");
  
  	return count;
  }
  
  static ssize_t pqi_lockup_action_store(struct device *dev,
  	struct device_attribute *attr, const char *buffer, size_t count)
  {
  	unsigned int i;
  	char *action_name;
  	char action_name_buffer[32];
  
  	strlcpy(action_name_buffer, buffer, sizeof(action_name_buffer));
  	action_name = strstrip(action_name_buffer);
  
  	for (i = 0; i < ARRAY_SIZE(pqi_lockup_actions); i++) {
  		if (strcmp(action_name, pqi_lockup_actions[i].name) == 0) {
  			pqi_lockup_action = pqi_lockup_actions[i].action;
  			return count;
  		}
  	}
  
  	return -EINVAL;
  }
  
  static DEVICE_ATTR(version, 0444, pqi_version_show, NULL);
  static DEVICE_ATTR(rescan, 0200, NULL, pqi_host_rescan_store);
  static DEVICE_ATTR(lockup_action, 0644,
  	pqi_lockup_action_show, pqi_lockup_action_store);
  
  static struct device_attribute *pqi_shost_attrs[] = {
  	&dev_attr_version,
  	&dev_attr_rescan,
  	&dev_attr_lockup_action,
  	NULL
  };
  
  static ssize_t pqi_sas_address_show(struct device *dev,
  	struct device_attribute *attr, char *buffer)
  {
  	struct pqi_ctrl_info *ctrl_info;
  	struct scsi_device *sdev;
  	struct pqi_scsi_dev *device;
  	unsigned long flags;
  	u64 sas_address;
  
  	sdev = to_scsi_device(dev);
  	ctrl_info = shost_to_hba(sdev->host);
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  	device = sdev->hostdata;
  	if (pqi_is_logical_device(device)) {
  		spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock,
  			flags);
  		return -ENODEV;
  	}
  	sas_address = device->sas_address;
  
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	return snprintf(buffer, PAGE_SIZE, "0x%016llx\n", sas_address);
  }
  
  static ssize_t pqi_ssd_smart_path_enabled_show(struct device *dev,
  	struct device_attribute *attr, char *buffer)
  {
  	struct pqi_ctrl_info *ctrl_info;
  	struct scsi_device *sdev;
  	struct pqi_scsi_dev *device;
  	unsigned long flags;
  
  	sdev = to_scsi_device(dev);
  	ctrl_info = shost_to_hba(sdev->host);
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  	device = sdev->hostdata;
  	buffer[0] = device->raid_bypass_enabled ? '1' : '0';
  	buffer[1] = '\n';
  	buffer[2] = '\0';
  
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	return 2;
  }
  
  static ssize_t pqi_raid_level_show(struct device *dev,
  	struct device_attribute *attr, char *buffer)
  {
  	struct pqi_ctrl_info *ctrl_info;
  	struct scsi_device *sdev;
  	struct pqi_scsi_dev *device;
  	unsigned long flags;
  	char *raid_level;
  
  	sdev = to_scsi_device(dev);
  	ctrl_info = shost_to_hba(sdev->host);
  
  	spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
  
  	device = sdev->hostdata;
  
  	if (pqi_is_logical_device(device))
  		raid_level = pqi_raid_level_to_string(device->raid_level);
  	else
  		raid_level = "N/A";
  
  	spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
  
  	return snprintf(buffer, PAGE_SIZE, "%s\n", raid_level);
  }
  
  static DEVICE_ATTR(sas_address, 0444, pqi_sas_address_show, NULL);
  static DEVICE_ATTR(ssd_smart_path_enabled, 0444,
  	pqi_ssd_smart_path_enabled_show, NULL);
  static DEVICE_ATTR(raid_level, 0444, pqi_raid_level_show, NULL);
  
  static struct device_attribute *pqi_sdev_attrs[] = {
  	&dev_attr_sas_address,
  	&dev_attr_ssd_smart_path_enabled,
  	&dev_attr_raid_level,
  	NULL
  };
  
  static struct scsi_host_template pqi_driver_template = {
  	.module = THIS_MODULE,
  	.name = DRIVER_NAME_SHORT,
  	.proc_name = DRIVER_NAME_SHORT,
  	.queuecommand = pqi_scsi_queue_command,
  	.scan_start = pqi_scan_start,
  	.scan_finished = pqi_scan_finished,
  	.this_id = -1,
  	.use_clustering = ENABLE_CLUSTERING,
  	.eh_device_reset_handler = pqi_eh_device_reset_handler,
  	.ioctl = pqi_ioctl,
  	.slave_alloc = pqi_slave_alloc,
  	.map_queues = pqi_map_queues,
  	.sdev_attrs = pqi_sdev_attrs,
  	.shost_attrs = pqi_shost_attrs,
  };
  
  static int pqi_register_scsi(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct Scsi_Host *shost;
  
  	shost = scsi_host_alloc(&pqi_driver_template, sizeof(ctrl_info));
  	if (!shost) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"scsi_host_alloc failed for controller %u\n",
  			ctrl_info->ctrl_id);
  		return -ENOMEM;
  	}
  
  	shost->io_port = 0;
  	shost->n_io_port = 0;
  	shost->this_id = -1;
  	shost->max_channel = PQI_MAX_BUS;
  	shost->max_cmd_len = MAX_COMMAND_SIZE;
  	shost->max_lun = ~0;
  	shost->max_id = ~0;
  	shost->max_sectors = ctrl_info->max_sectors;
  	shost->can_queue = ctrl_info->scsi_ml_can_queue;
  	shost->cmd_per_lun = shost->can_queue;
  	shost->sg_tablesize = ctrl_info->sg_tablesize;
  	shost->transportt = pqi_sas_transport_template;
  	shost->irq = pci_irq_vector(ctrl_info->pci_dev, 0);
  	shost->unique_id = shost->irq;
  	shost->nr_hw_queues = ctrl_info->num_queue_groups;
  	shost->hostdata[0] = (unsigned long)ctrl_info;
  
  	rc = scsi_add_host(shost, &ctrl_info->pci_dev->dev);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"scsi_add_host failed for controller %u\n",
  			ctrl_info->ctrl_id);
  		goto free_host;
  	}
  
  	rc = pqi_add_sas_host(shost, ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"add SAS host failed for controller %u\n",
  			ctrl_info->ctrl_id);
  		goto remove_host;
  	}
  
  	ctrl_info->scsi_host = shost;
  
  	return 0;
  
  remove_host:
  	scsi_remove_host(shost);
  free_host:
  	scsi_host_put(shost);
  
  	return rc;
  }
  
  static void pqi_unregister_scsi(struct pqi_ctrl_info *ctrl_info)
  {
  	struct Scsi_Host *shost;
  
  	pqi_delete_sas_host(ctrl_info);
  
  	shost = ctrl_info->scsi_host;
  	if (!shost)
  		return;
  
  	scsi_remove_host(shost);
  	scsi_host_put(shost);
  }
  
  static int pqi_wait_for_pqi_reset_completion(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc = 0;
  	struct pqi_device_registers __iomem *pqi_registers;
  	unsigned long timeout;
  	unsigned int timeout_msecs;
  	union pqi_reset_register reset_reg;
  
  	pqi_registers = ctrl_info->pqi_registers;
  	timeout_msecs = readw(&pqi_registers->max_reset_timeout) * 100;
  	timeout = msecs_to_jiffies(timeout_msecs) + jiffies;
  
  	while (1) {
  		msleep(PQI_RESET_POLL_INTERVAL_MSECS);
  		reset_reg.all_bits = readl(&pqi_registers->device_reset);
  		if (reset_reg.bits.reset_action == PQI_RESET_ACTION_COMPLETED)
  			break;
  		pqi_check_ctrl_health(ctrl_info);
  		if (pqi_ctrl_offline(ctrl_info)) {
  			rc = -ENXIO;
  			break;
  		}
  		if (time_after(jiffies, timeout)) {
  			rc = -ETIMEDOUT;
  			break;
  		}
  	}
  
  	return rc;
  }
  
  static int pqi_reset(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	union pqi_reset_register reset_reg;
  
  	if (ctrl_info->pqi_reset_quiesce_supported) {
  		rc = sis_pqi_reset_quiesce(ctrl_info);
  		if (rc) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"PQI reset failed during quiesce with error %d\n",
  				rc);
  			return rc;
  		}
  	}
  
  	reset_reg.all_bits = 0;
  	reset_reg.bits.reset_type = PQI_RESET_TYPE_HARD_RESET;
  	reset_reg.bits.reset_action = PQI_RESET_ACTION_RESET;
  
  	writel(reset_reg.all_bits, &ctrl_info->pqi_registers->device_reset);
  
  	rc = pqi_wait_for_pqi_reset_completion(ctrl_info);
  	if (rc)
  		dev_err(&ctrl_info->pci_dev->dev,
  			"PQI reset failed with error %d\n", rc);
  
  	return rc;
  }
  
  static int pqi_get_ctrl_firmware_version(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	struct bmic_identify_controller *identify;
  
  	identify = kmalloc(sizeof(*identify), GFP_KERNEL);
  	if (!identify)
  		return -ENOMEM;
  
  	rc = pqi_identify_controller(ctrl_info, identify);
  	if (rc)
  		goto out;
  
  	memcpy(ctrl_info->firmware_version, identify->firmware_version,
  		sizeof(identify->firmware_version));
  	ctrl_info->firmware_version[sizeof(identify->firmware_version)] = '\0';
  	snprintf(ctrl_info->firmware_version +
  		strlen(ctrl_info->firmware_version),
  		sizeof(ctrl_info->firmware_version),
  		"-%u", get_unaligned_le16(&identify->firmware_build_number));
  
  out:
  	kfree(identify);
  
  	return rc;
  }
  
  static int pqi_process_config_table(struct pqi_ctrl_info *ctrl_info)
  {
  	u32 table_length;
  	u32 section_offset;
  	void __iomem *table_iomem_addr;
  	struct pqi_config_table *config_table;
  	struct pqi_config_table_section_header *section;
  
  	table_length = ctrl_info->config_table_length;
  
  	config_table = kmalloc(table_length, GFP_KERNEL);
  	if (!config_table) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to allocate memory for PQI configuration table\n");
  		return -ENOMEM;
  	}
  
  	/*
  	 * Copy the config table contents from I/O memory space into the
  	 * temporary buffer.
  	 */
  	table_iomem_addr = ctrl_info->iomem_base +
  		ctrl_info->config_table_offset;
  	memcpy_fromio(config_table, table_iomem_addr, table_length);
  
  	section_offset =
  		get_unaligned_le32(&config_table->first_section_offset);
  
  	while (section_offset) {
  		section = (void *)config_table + section_offset;
  
  		switch (get_unaligned_le16(&section->section_id)) {
  		case PQI_CONFIG_TABLE_SECTION_HEARTBEAT:
  			if (pqi_disable_heartbeat)
  				dev_warn(&ctrl_info->pci_dev->dev,
  				"heartbeat disabled by module parameter\n");
  			else
  				ctrl_info->heartbeat_counter =
  					table_iomem_addr +
  					section_offset +
  					offsetof(
  					struct pqi_config_table_heartbeat,
  						heartbeat_counter);
  			break;
  		}
  
  		section_offset =
  			get_unaligned_le16(&section->next_section_offset);
  	}
  
  	kfree(config_table);
  
  	return 0;
  }
  
  /* Switches the controller from PQI mode back into SIS mode. */
  
  static int pqi_revert_to_sis_mode(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  
  	pqi_change_irq_mode(ctrl_info, IRQ_MODE_NONE);
  	rc = pqi_reset(ctrl_info);
  	if (rc)
  		return rc;
  	rc = sis_reenable_sis_mode(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"re-enabling SIS mode failed with error %d\n", rc);
  		return rc;
  	}
  	pqi_save_ctrl_mode(ctrl_info, SIS_MODE);
  
  	return 0;
  }
  
  /*
   * If the controller isn't already in SIS mode, this function forces it into
   * SIS mode.
   */
  
  static int pqi_force_sis_mode(struct pqi_ctrl_info *ctrl_info)
  {
  	if (!sis_is_firmware_running(ctrl_info))
  		return -ENXIO;
  
  	if (pqi_get_ctrl_mode(ctrl_info) == SIS_MODE)
  		return 0;
  
  	if (sis_is_kernel_up(ctrl_info)) {
  		pqi_save_ctrl_mode(ctrl_info, SIS_MODE);
  		return 0;
  	}
  
  	return pqi_revert_to_sis_mode(ctrl_info);
  }
  
  static int pqi_ctrl_init(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  
  	rc = pqi_force_sis_mode(ctrl_info);
  	if (rc)
  		return rc;
  
  	/*
  	 * Wait until the controller is ready to start accepting SIS
  	 * commands.
  	 */
  	rc = sis_wait_for_ctrl_ready(ctrl_info);
  	if (rc)
  		return rc;
  
  	/*
  	 * Get the controller properties.  This allows us to determine
  	 * whether or not it supports PQI mode.
  	 */
  	rc = sis_get_ctrl_properties(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error obtaining controller properties\n");
  		return rc;
  	}
  
  	rc = sis_get_pqi_capabilities(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error obtaining controller capabilities\n");
  		return rc;
  	}
  
  	if (reset_devices) {
  		if (ctrl_info->max_outstanding_requests >
  			PQI_MAX_OUTSTANDING_REQUESTS_KDUMP)
  			ctrl_info->max_outstanding_requests =
  					PQI_MAX_OUTSTANDING_REQUESTS_KDUMP;
  	} else {
  		if (ctrl_info->max_outstanding_requests >
  			PQI_MAX_OUTSTANDING_REQUESTS)
  			ctrl_info->max_outstanding_requests =
  					PQI_MAX_OUTSTANDING_REQUESTS;
  	}
  
  	pqi_calculate_io_resources(ctrl_info);
  
  	rc = pqi_alloc_error_buffer(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to allocate PQI error buffer\n");
  		return rc;
  	}
  
  	/*
  	 * If the function we are about to call succeeds, the
  	 * controller will transition from legacy SIS mode
  	 * into PQI mode.
  	 */
  	rc = sis_init_base_struct_addr(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error initializing PQI mode\n");
  		return rc;
  	}
  
  	/* Wait for the controller to complete the SIS -> PQI transition. */
  	rc = pqi_wait_for_pqi_mode_ready(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"transition to PQI mode failed\n");
  		return rc;
  	}
  
  	/* From here on, we are running in PQI mode. */
  	ctrl_info->pqi_mode_enabled = true;
  	pqi_save_ctrl_mode(ctrl_info, PQI_MODE);
  
  	rc = pqi_process_config_table(ctrl_info);
  	if (rc)
  		return rc;
  
  	rc = pqi_alloc_admin_queues(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to allocate admin queues\n");
  		return rc;
  	}
  
  	rc = pqi_create_admin_queues(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating admin queues\n");
  		return rc;
  	}
  
  	rc = pqi_report_device_capability(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"obtaining device capability failed\n");
  		return rc;
  	}
  
  	rc = pqi_validate_device_capability(ctrl_info);
  	if (rc)
  		return rc;
  
  	pqi_calculate_queue_resources(ctrl_info);
  
  	rc = pqi_enable_msix_interrupts(ctrl_info);
  	if (rc)
  		return rc;
  
  	if (ctrl_info->num_msix_vectors_enabled < ctrl_info->num_queue_groups) {
  		ctrl_info->max_msix_vectors =
  			ctrl_info->num_msix_vectors_enabled;
  		pqi_calculate_queue_resources(ctrl_info);
  	}
  
  	rc = pqi_alloc_io_resources(ctrl_info);
  	if (rc)
  		return rc;
  
  	rc = pqi_alloc_operational_queues(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to allocate operational queues\n");
  		return rc;
  	}
  
  	pqi_init_operational_queues(ctrl_info);
  
  	rc = pqi_request_irqs(ctrl_info);
  	if (rc)
  		return rc;
  
  	rc = pqi_create_queues(ctrl_info);
  	if (rc)
  		return rc;
  
  	pqi_change_irq_mode(ctrl_info, IRQ_MODE_MSIX);
  
  	ctrl_info->controller_online = true;
  	pqi_start_heartbeat_timer(ctrl_info);
  
  	rc = pqi_enable_events(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error enabling events\n");
  		return rc;
  	}
  
  	/* Register with the SCSI subsystem. */
  	rc = pqi_register_scsi(ctrl_info);
  	if (rc)
  		return rc;
  
  	rc = pqi_get_ctrl_firmware_version(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error obtaining firmware version\n");
  		return rc;
  	}
  
  	rc = pqi_write_driver_version_to_host_wellness(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error updating host wellness\n");
  		return rc;
  	}
  
  	pqi_schedule_update_time_worker(ctrl_info);
  
  	pqi_scan_scsi_devices(ctrl_info);
  
  	return 0;
  }
  
  static void pqi_reinit_queues(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	struct pqi_admin_queues *admin_queues;
  	struct pqi_event_queue *event_queue;
  
  	admin_queues = &ctrl_info->admin_queues;
  	admin_queues->iq_pi_copy = 0;
  	admin_queues->oq_ci_copy = 0;
  	*admin_queues->oq_pi = 0;
  
  	for (i = 0; i < ctrl_info->num_queue_groups; i++) {
  		ctrl_info->queue_groups[i].iq_pi_copy[RAID_PATH] = 0;
  		ctrl_info->queue_groups[i].iq_pi_copy[AIO_PATH] = 0;
  		ctrl_info->queue_groups[i].oq_ci_copy = 0;
  
  		*ctrl_info->queue_groups[i].iq_ci[RAID_PATH] = 0;
  		*ctrl_info->queue_groups[i].iq_ci[AIO_PATH] = 0;
  		*ctrl_info->queue_groups[i].oq_pi = 0;
  	}
  
  	event_queue = &ctrl_info->event_queue;
  	*event_queue->oq_pi = 0;
  	event_queue->oq_ci_copy = 0;
  }
  
  static int pqi_ctrl_init_resume(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  
  	rc = pqi_force_sis_mode(ctrl_info);
  	if (rc)
  		return rc;
  
  	/*
  	 * Wait until the controller is ready to start accepting SIS
  	 * commands.
  	 */
  	rc = sis_wait_for_ctrl_ready_resume(ctrl_info);
  	if (rc)
  		return rc;
  
  	/*
  	 * If the function we are about to call succeeds, the
  	 * controller will transition from legacy SIS mode
  	 * into PQI mode.
  	 */
  	rc = sis_init_base_struct_addr(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error initializing PQI mode\n");
  		return rc;
  	}
  
  	/* Wait for the controller to complete the SIS -> PQI transition. */
  	rc = pqi_wait_for_pqi_mode_ready(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"transition to PQI mode failed\n");
  		return rc;
  	}
  
  	/* From here on, we are running in PQI mode. */
  	ctrl_info->pqi_mode_enabled = true;
  	pqi_save_ctrl_mode(ctrl_info, PQI_MODE);
  
  	pqi_reinit_queues(ctrl_info);
  
  	rc = pqi_create_admin_queues(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error creating admin queues\n");
  		return rc;
  	}
  
  	rc = pqi_create_queues(ctrl_info);
  	if (rc)
  		return rc;
  
  	pqi_change_irq_mode(ctrl_info, IRQ_MODE_MSIX);
  
  	ctrl_info->controller_online = true;
  	pqi_start_heartbeat_timer(ctrl_info);
  	pqi_ctrl_unblock_requests(ctrl_info);
  
  	rc = pqi_enable_events(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error enabling events\n");
  		return rc;
  	}
  
  	rc = pqi_write_driver_version_to_host_wellness(ctrl_info);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"error updating host wellness\n");
  		return rc;
  	}
  
  	pqi_schedule_update_time_worker(ctrl_info);
  
  	pqi_scan_scsi_devices(ctrl_info);
  
  	return 0;
  }
  
  static inline int pqi_set_pcie_completion_timeout(struct pci_dev *pci_dev,
  	u16 timeout)
  {
  	return pcie_capability_clear_and_set_word(pci_dev, PCI_EXP_DEVCTL2,
  		PCI_EXP_DEVCTL2_COMP_TIMEOUT, timeout);
  }
  
  static int pqi_pci_init(struct pqi_ctrl_info *ctrl_info)
  {
  	int rc;
  	u64 mask;
  
  	rc = pci_enable_device(ctrl_info->pci_dev);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to enable PCI device\n");
  		return rc;
  	}
  
  	if (sizeof(dma_addr_t) > 4)
  		mask = DMA_BIT_MASK(64);
  	else
  		mask = DMA_BIT_MASK(32);
  
  	rc = dma_set_mask(&ctrl_info->pci_dev->dev, mask);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev, "failed to set DMA mask\n");
  		goto disable_device;
  	}
  
  	rc = pci_request_regions(ctrl_info->pci_dev, DRIVER_NAME_SHORT);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to obtain PCI resources\n");
  		goto disable_device;
  	}
  
  	ctrl_info->iomem_base = ioremap_nocache(pci_resource_start(
  		ctrl_info->pci_dev, 0),
  		sizeof(struct pqi_ctrl_registers));
  	if (!ctrl_info->iomem_base) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to map memory for controller registers\n");
  		rc = -ENOMEM;
  		goto release_regions;
  	}
  
  #define PCI_EXP_COMP_TIMEOUT_65_TO_210_MS		0x6
  
  	/* Increase the PCIe completion timeout. */
  	rc = pqi_set_pcie_completion_timeout(ctrl_info->pci_dev,
  		PCI_EXP_COMP_TIMEOUT_65_TO_210_MS);
  	if (rc) {
  		dev_err(&ctrl_info->pci_dev->dev,
  			"failed to set PCIe completion timeout\n");
  		goto release_regions;
  	}
  
  	/* Enable bus mastering. */
  	pci_set_master(ctrl_info->pci_dev);
  
  	ctrl_info->registers = ctrl_info->iomem_base;
  	ctrl_info->pqi_registers = &ctrl_info->registers->pqi_registers;
  
  	pci_set_drvdata(ctrl_info->pci_dev, ctrl_info);
  
  	return 0;
  
  release_regions:
  	pci_release_regions(ctrl_info->pci_dev);
  disable_device:
  	pci_disable_device(ctrl_info->pci_dev);
  
  	return rc;
  }
  
  static void pqi_cleanup_pci_init(struct pqi_ctrl_info *ctrl_info)
  {
  	iounmap(ctrl_info->iomem_base);
  	pci_release_regions(ctrl_info->pci_dev);
  	if (pci_is_enabled(ctrl_info->pci_dev))
  		pci_disable_device(ctrl_info->pci_dev);
  	pci_set_drvdata(ctrl_info->pci_dev, NULL);
  }
  
  static struct pqi_ctrl_info *pqi_alloc_ctrl_info(int numa_node)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = kzalloc_node(sizeof(struct pqi_ctrl_info),
  			GFP_KERNEL, numa_node);
  	if (!ctrl_info)
  		return NULL;
  
  	mutex_init(&ctrl_info->scan_mutex);
  	mutex_init(&ctrl_info->lun_reset_mutex);
  
  	INIT_LIST_HEAD(&ctrl_info->scsi_device_list);
  	spin_lock_init(&ctrl_info->scsi_device_list_lock);
  
  	INIT_WORK(&ctrl_info->event_work, pqi_event_worker);
  	atomic_set(&ctrl_info->num_interrupts, 0);
  
  	INIT_DELAYED_WORK(&ctrl_info->rescan_work, pqi_rescan_worker);
  	INIT_DELAYED_WORK(&ctrl_info->update_time_work, pqi_update_time_worker);
  
  	timer_setup(&ctrl_info->heartbeat_timer, pqi_heartbeat_timer_handler, 0);
  	INIT_WORK(&ctrl_info->ctrl_offline_work, pqi_ctrl_offline_worker);
  
  	sema_init(&ctrl_info->sync_request_sem,
  		PQI_RESERVED_IO_SLOTS_SYNCHRONOUS_REQUESTS);
  	init_waitqueue_head(&ctrl_info->block_requests_wait);
  
  	INIT_LIST_HEAD(&ctrl_info->raid_bypass_retry_list);
  	spin_lock_init(&ctrl_info->raid_bypass_retry_list_lock);
  	INIT_WORK(&ctrl_info->raid_bypass_retry_work,
  		pqi_raid_bypass_retry_worker);
  
  	ctrl_info->ctrl_id = atomic_inc_return(&pqi_controller_count) - 1;
  	ctrl_info->irq_mode = IRQ_MODE_NONE;
  	ctrl_info->max_msix_vectors = PQI_MAX_MSIX_VECTORS;
  
  	return ctrl_info;
  }
  
  static inline void pqi_free_ctrl_info(struct pqi_ctrl_info *ctrl_info)
  {
  	kfree(ctrl_info);
  }
  
  static void pqi_free_interrupts(struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_free_irqs(ctrl_info);
  	pqi_disable_msix_interrupts(ctrl_info);
  }
  
  static void pqi_free_ctrl_resources(struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_stop_heartbeat_timer(ctrl_info);
  	pqi_free_interrupts(ctrl_info);
  	if (ctrl_info->queue_memory_base)
  		dma_free_coherent(&ctrl_info->pci_dev->dev,
  			ctrl_info->queue_memory_length,
  			ctrl_info->queue_memory_base,
  			ctrl_info->queue_memory_base_dma_handle);
  	if (ctrl_info->admin_queue_memory_base)
  		dma_free_coherent(&ctrl_info->pci_dev->dev,
  			ctrl_info->admin_queue_memory_length,
  			ctrl_info->admin_queue_memory_base,
  			ctrl_info->admin_queue_memory_base_dma_handle);
  	pqi_free_all_io_requests(ctrl_info);
  	if (ctrl_info->error_buffer)
  		dma_free_coherent(&ctrl_info->pci_dev->dev,
  			ctrl_info->error_buffer_length,
  			ctrl_info->error_buffer,
  			ctrl_info->error_buffer_dma_handle);
  	if (ctrl_info->iomem_base)
  		pqi_cleanup_pci_init(ctrl_info);
  	pqi_free_ctrl_info(ctrl_info);
  }
  
  static void pqi_remove_ctrl(struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_cancel_rescan_worker(ctrl_info);
  	pqi_cancel_update_time_worker(ctrl_info);
  	pqi_remove_all_scsi_devices(ctrl_info);
  	pqi_unregister_scsi(ctrl_info);
  	if (ctrl_info->pqi_mode_enabled)
  		pqi_revert_to_sis_mode(ctrl_info);
  	pqi_free_ctrl_resources(ctrl_info);
  }
  
  static void pqi_perform_lockup_action(void)
  {
  	switch (pqi_lockup_action) {
  	case PANIC:
  		panic("FATAL: Smart Family Controller lockup detected");
  		break;
  	case REBOOT:
  		emergency_restart();
  		break;
  	case NONE:
  	default:
  		break;
  	}
  }
  
  static struct pqi_raid_error_info pqi_ctrl_offline_raid_error_info = {
  	.data_out_result = PQI_DATA_IN_OUT_HARDWARE_ERROR,
  	.status = SAM_STAT_CHECK_CONDITION,
  };
  
  static void pqi_fail_all_outstanding_requests(struct pqi_ctrl_info *ctrl_info)
  {
  	unsigned int i;
  	struct pqi_io_request *io_request;
  	struct scsi_cmnd *scmd;
  
  	for (i = 0; i < ctrl_info->max_io_slots; i++) {
  		io_request = &ctrl_info->io_request_pool[i];
  		if (atomic_read(&io_request->refcount) == 0)
  			continue;
  
  		scmd = io_request->scmd;
  		if (scmd) {
  			set_host_byte(scmd, DID_NO_CONNECT);
  		} else {
  			io_request->status = -ENXIO;
  			io_request->error_info =
  				&pqi_ctrl_offline_raid_error_info;
  		}
  
  		io_request->io_complete_callback(io_request,
  			io_request->context);
  	}
  }
  
  static void pqi_take_ctrl_offline_deferred(struct pqi_ctrl_info *ctrl_info)
  {
  	pqi_perform_lockup_action();
  	pqi_stop_heartbeat_timer(ctrl_info);
  	pqi_free_interrupts(ctrl_info);
  	pqi_cancel_rescan_worker(ctrl_info);
  	pqi_cancel_update_time_worker(ctrl_info);
  	pqi_ctrl_wait_until_quiesced(ctrl_info);
  	pqi_fail_all_outstanding_requests(ctrl_info);
  	pqi_clear_all_queued_raid_bypass_retries(ctrl_info);
  	pqi_ctrl_unblock_requests(ctrl_info);
  }
  
  static void pqi_ctrl_offline_worker(struct work_struct *work)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = container_of(work, struct pqi_ctrl_info, ctrl_offline_work);
  	pqi_take_ctrl_offline_deferred(ctrl_info);
  }
  
  static void pqi_take_ctrl_offline(struct pqi_ctrl_info *ctrl_info)
  {
  	if (!ctrl_info->controller_online)
  		return;
  
  	ctrl_info->controller_online = false;
  	ctrl_info->pqi_mode_enabled = false;
  	pqi_ctrl_block_requests(ctrl_info);
  	if (!pqi_disable_ctrl_shutdown)
  		sis_shutdown_ctrl(ctrl_info);
  	pci_disable_device(ctrl_info->pci_dev);
  	dev_err(&ctrl_info->pci_dev->dev, "controller offline\n");
  	schedule_work(&ctrl_info->ctrl_offline_work);
  }
  
  static void pqi_print_ctrl_info(struct pci_dev *pci_dev,
  	const struct pci_device_id *id)
  {
  	char *ctrl_description;
  
  	if (id->driver_data)
  		ctrl_description = (char *)id->driver_data;
  	else
  		ctrl_description = "Microsemi Smart Family Controller";
  
  	dev_info(&pci_dev->dev, "%s found\n", ctrl_description);
  }
  
  static int pqi_pci_probe(struct pci_dev *pci_dev,
  	const struct pci_device_id *id)
  {
  	int rc;
  	int node;
  	struct pqi_ctrl_info *ctrl_info;
  
  	pqi_print_ctrl_info(pci_dev, id);
  
  	if (pqi_disable_device_id_wildcards &&
  		id->subvendor == PCI_ANY_ID &&
  		id->subdevice == PCI_ANY_ID) {
  		dev_warn(&pci_dev->dev,
  			"controller not probed because device ID wildcards are disabled\n");
  		return -ENODEV;
  	}
  
  	if (id->subvendor == PCI_ANY_ID || id->subdevice == PCI_ANY_ID)
  		dev_warn(&pci_dev->dev,
  			"controller device ID matched using wildcards\n");
  
  	node = dev_to_node(&pci_dev->dev);
  	if (node == NUMA_NO_NODE)
  		set_dev_node(&pci_dev->dev, 0);
  
  	ctrl_info = pqi_alloc_ctrl_info(node);
  	if (!ctrl_info) {
  		dev_err(&pci_dev->dev,
  			"failed to allocate controller info block\n");
  		return -ENOMEM;
  	}
  
  	ctrl_info->pci_dev = pci_dev;
  
  	rc = pqi_pci_init(ctrl_info);
  	if (rc)
  		goto error;
  
  	rc = pqi_ctrl_init(ctrl_info);
  	if (rc)
  		goto error;
  
  	return 0;
  
  error:
  	pqi_remove_ctrl(ctrl_info);
  
  	return rc;
  }
  
  static void pqi_pci_remove(struct pci_dev *pci_dev)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = pci_get_drvdata(pci_dev);
  	if (!ctrl_info)
  		return;
  
  	pqi_remove_ctrl(ctrl_info);
  }
  
  static void pqi_shutdown(struct pci_dev *pci_dev)
  {
  	int rc;
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = pci_get_drvdata(pci_dev);
  	if (!ctrl_info)
  		goto error;
  
  	/*
  	 * Write all data in the controller's battery-backed cache to
  	 * storage.
  	 */
  	rc = pqi_flush_cache(ctrl_info, SHUTDOWN);
  	pqi_reset(ctrl_info);
  	if (rc == 0)
  		return;
  
  error:
  	dev_warn(&pci_dev->dev,
  		"unable to flush controller cache\n");
  }
  
  static void pqi_process_lockup_action_param(void)
  {
  	unsigned int i;
  
  	if (!pqi_lockup_action_param)
  		return;
  
  	for (i = 0; i < ARRAY_SIZE(pqi_lockup_actions); i++) {
  		if (strcmp(pqi_lockup_action_param,
  			pqi_lockup_actions[i].name) == 0) {
  			pqi_lockup_action = pqi_lockup_actions[i].action;
  			return;
  		}
  	}
  
  	pr_warn("%s: invalid lockup action setting \"%s\" - supported settings: none, reboot, panic\n",
  		DRIVER_NAME_SHORT, pqi_lockup_action_param);
  }
  
  static void pqi_process_module_params(void)
  {
  	pqi_process_lockup_action_param();
  }
  
  static __maybe_unused int pqi_suspend(struct pci_dev *pci_dev, pm_message_t state)
  {
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = pci_get_drvdata(pci_dev);
  
  	pqi_disable_events(ctrl_info);
  	pqi_cancel_update_time_worker(ctrl_info);
  	pqi_cancel_rescan_worker(ctrl_info);
  	pqi_wait_until_scan_finished(ctrl_info);
  	pqi_wait_until_lun_reset_finished(ctrl_info);
  	pqi_flush_cache(ctrl_info, SUSPEND);
  	pqi_ctrl_block_requests(ctrl_info);
  	pqi_ctrl_wait_until_quiesced(ctrl_info);
  	pqi_wait_until_inbound_queues_empty(ctrl_info);
  	pqi_ctrl_wait_for_pending_io(ctrl_info);
  	pqi_stop_heartbeat_timer(ctrl_info);
  
  	if (state.event == PM_EVENT_FREEZE)
  		return 0;
  
  	pci_save_state(pci_dev);
  	pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
  
  	ctrl_info->controller_online = false;
  	ctrl_info->pqi_mode_enabled = false;
  
  	return 0;
  }
  
  static __maybe_unused int pqi_resume(struct pci_dev *pci_dev)
  {
  	int rc;
  	struct pqi_ctrl_info *ctrl_info;
  
  	ctrl_info = pci_get_drvdata(pci_dev);
  
  	if (pci_dev->current_state != PCI_D0) {
  		ctrl_info->max_hw_queue_index = 0;
  		pqi_free_interrupts(ctrl_info);
  		pqi_change_irq_mode(ctrl_info, IRQ_MODE_INTX);
  		rc = request_irq(pci_irq_vector(pci_dev, 0), pqi_irq_handler,
  			IRQF_SHARED, DRIVER_NAME_SHORT,
  			&ctrl_info->queue_groups[0]);
  		if (rc) {
  			dev_err(&ctrl_info->pci_dev->dev,
  				"irq %u init failed with error %d\n",
  				pci_dev->irq, rc);
  			return rc;
  		}
  		pqi_start_heartbeat_timer(ctrl_info);
  		pqi_ctrl_unblock_requests(ctrl_info);
  		return 0;
  	}
  
  	pci_set_power_state(pci_dev, PCI_D0);
  	pci_restore_state(pci_dev);
  
  	return pqi_ctrl_init_resume(ctrl_info);
  }
  
  /* Define the PCI IDs for the controllers that we support. */
  static const struct pci_device_id pqi_pci_id_table[] = {
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x105b, 0x1211)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x105b, 0x1321)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x152d, 0x8a22)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x152d, 0x8a23)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x152d, 0x8a24)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x152d, 0x8a36)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x152d, 0x8a37)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x193d, 0x8460)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x193d, 0x8461)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x193d, 0xf460)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x193d, 0xf461)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x1bd4, 0x0045)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x1bd4, 0x0046)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x1bd4, 0x0047)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       0x1bd4, 0x0048)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0110)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0608)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0800)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0801)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0802)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0803)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0804)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0805)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0806)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0807)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0900)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0901)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0902)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0903)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0904)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0905)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0906)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0907)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x0908)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x090a)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1200)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1201)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1202)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1280)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1281)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1282)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1300)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1301)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1302)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1303)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_ADAPTEC2, 0x1380)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_DELL, 0x1fe0)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0600)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0601)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0602)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0603)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0609)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0650)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0651)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0652)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0653)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0654)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0655)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0700)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x0701)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x1001)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x1100)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_VENDOR_ID_HP, 0x1101)
  	},
  	{
  		PCI_DEVICE_SUB(PCI_VENDOR_ID_ADAPTEC2, 0x028f,
  			       PCI_ANY_ID, PCI_ANY_ID)
  	},
  	{ 0 }
  };
  
  MODULE_DEVICE_TABLE(pci, pqi_pci_id_table);
  
  static struct pci_driver pqi_pci_driver = {
  	.name = DRIVER_NAME_SHORT,
  	.id_table = pqi_pci_id_table,
  	.probe = pqi_pci_probe,
  	.remove = pqi_pci_remove,
  	.shutdown = pqi_shutdown,
  #if defined(CONFIG_PM)
  	.suspend = pqi_suspend,
  	.resume = pqi_resume,
  #endif
  };
  
  static int __init pqi_init(void)
  {
  	int rc;
  
  	pr_info(DRIVER_NAME "\n");
  
  	pqi_sas_transport_template =
  		sas_attach_transport(&pqi_sas_transport_functions);
  	if (!pqi_sas_transport_template)
  		return -ENODEV;
  
  	pqi_process_module_params();
  
  	rc = pci_register_driver(&pqi_pci_driver);
  	if (rc)
  		sas_release_transport(pqi_sas_transport_template);
  
  	return rc;
  }
  
  static void __exit pqi_cleanup(void)
  {
  	pci_unregister_driver(&pqi_pci_driver);
  	sas_release_transport(pqi_sas_transport_template);
  }
  
  module_init(pqi_init);
  module_exit(pqi_cleanup);
  
  static void __attribute__((unused)) verify_structures(void)
  {
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_host_to_ctrl_doorbell) != 0x20);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_interrupt_mask) != 0x34);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_ctrl_to_host_doorbell) != 0x9c);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_ctrl_to_host_doorbell_clear) != 0xa0);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_driver_scratch) != 0xb0);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_firmware_status) != 0xbc);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		sis_mailbox) != 0x1000);
  	BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
  		pqi_registers) != 0x4000);
  
  	BUILD_BUG_ON(offsetof(struct pqi_iu_header,
  		iu_type) != 0x0);
  	BUILD_BUG_ON(offsetof(struct pqi_iu_header,
  		iu_length) != 0x2);
  	BUILD_BUG_ON(offsetof(struct pqi_iu_header,
  		response_queue_id) != 0x4);
  	BUILD_BUG_ON(offsetof(struct pqi_iu_header,
  		work_area) != 0x6);
  	BUILD_BUG_ON(sizeof(struct pqi_iu_header) != 0x8);
  
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		status) != 0x0);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		service_response) != 0x1);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		data_present) != 0x2);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		reserved) != 0x3);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		residual_count) != 0x4);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		data_length) != 0x8);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		reserved1) != 0xa);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_error_info,
  		data) != 0xc);
  	BUILD_BUG_ON(sizeof(struct pqi_aio_error_info) != 0x10c);
  
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		data_in_result) != 0x0);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		data_out_result) != 0x1);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		reserved) != 0x2);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		status) != 0x5);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		status_qualifier) != 0x6);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		sense_data_length) != 0x8);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		response_data_length) != 0xa);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		data_in_transferred) != 0xc);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		data_out_transferred) != 0x10);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_error_info,
  		data) != 0x14);
  	BUILD_BUG_ON(sizeof(struct pqi_raid_error_info) != 0x114);
  
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		signature) != 0x0);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		function_and_status_code) != 0x8);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		max_admin_iq_elements) != 0x10);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		max_admin_oq_elements) != 0x11);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_iq_element_length) != 0x12);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_oq_element_length) != 0x13);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		max_reset_timeout) != 0x14);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		legacy_intx_status) != 0x18);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		legacy_intx_mask_set) != 0x1c);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		legacy_intx_mask_clear) != 0x20);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		device_status) != 0x40);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_iq_pi_offset) != 0x48);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_oq_ci_offset) != 0x50);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_iq_element_array_addr) != 0x58);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_oq_element_array_addr) != 0x60);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_iq_ci_addr) != 0x68);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_oq_pi_addr) != 0x70);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_iq_num_elements) != 0x78);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_oq_num_elements) != 0x79);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		admin_queue_int_msg_num) != 0x7a);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		device_error) != 0x80);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		error_details) != 0x88);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		device_reset) != 0x90);
  	BUILD_BUG_ON(offsetof(struct pqi_device_registers,
  		power_action) != 0x94);
  	BUILD_BUG_ON(sizeof(struct pqi_device_registers) != 0x100);
  
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		header.work_area) != 6);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		function_code) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.report_device_capability.buffer_length) != 44);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.report_device_capability.sg_descriptor) != 48);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.queue_id) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.element_array_addr) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.ci_addr) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.num_elements) != 32);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.element_length) != 34);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_iq.queue_protocol) != 36);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.queue_id) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.element_array_addr) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.pi_addr) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.num_elements) != 32);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.element_length) != 34);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.queue_protocol) != 36);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.int_msg_num) != 40);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.coalescing_count) != 42);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.min_coalescing_time) != 44);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.create_operational_oq.max_coalescing_time) != 48);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_request,
  		data.delete_operational_queue.queue_id) != 12);
  	BUILD_BUG_ON(sizeof(struct pqi_general_admin_request) != 64);
  	BUILD_BUG_ON(FIELD_SIZEOF(struct pqi_general_admin_request,
  		data.create_operational_iq) != 64 - 11);
  	BUILD_BUG_ON(FIELD_SIZEOF(struct pqi_general_admin_request,
  		data.create_operational_oq) != 64 - 11);
  	BUILD_BUG_ON(FIELD_SIZEOF(struct pqi_general_admin_request,
  		data.delete_operational_queue) != 64 - 11);
  
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		header.work_area) != 6);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		function_code) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		status) != 11);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		data.create_operational_iq.status_descriptor) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		data.create_operational_iq.iq_pi_offset) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		data.create_operational_oq.status_descriptor) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_admin_response,
  		data.create_operational_oq.oq_ci_offset) != 16);
  	BUILD_BUG_ON(sizeof(struct pqi_general_admin_response) != 64);
  
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		header.response_queue_id) != 4);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		header.work_area) != 6);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		nexus_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		buffer_length) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		lun_number) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		protocol_specific) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		error_index) != 27);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		cdb) != 32);
  	BUILD_BUG_ON(offsetof(struct pqi_raid_path_request,
  		sg_descriptors) != 64);
  	BUILD_BUG_ON(sizeof(struct pqi_raid_path_request) !=
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		header.response_queue_id) != 4);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		header.work_area) != 6);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		nexus_id) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		buffer_length) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		data_encryption_key_index) != 22);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		encrypt_tweak_lower) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		encrypt_tweak_upper) != 28);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		cdb) != 32);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		error_index) != 48);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		num_sg_descriptors) != 50);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		cdb_length) != 51);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		lun_number) != 52);
  	BUILD_BUG_ON(offsetof(struct pqi_aio_path_request,
  		sg_descriptors) != 64);
  	BUILD_BUG_ON(sizeof(struct pqi_aio_path_request) !=
  		PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
  
  	BUILD_BUG_ON(offsetof(struct pqi_io_response,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_io_response,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_io_response,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_io_response,
  		error_index) != 10);
  
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		header.response_queue_id) != 4);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		data.report_event_configuration.buffer_length) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		data.report_event_configuration.sg_descriptors) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		data.set_event_configuration.global_event_oq_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		data.set_event_configuration.buffer_length) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_general_management_request,
  		data.set_event_configuration.sg_descriptors) != 16);
  
  	BUILD_BUG_ON(offsetof(struct pqi_iu_layer_descriptor,
  		max_inbound_iu_length) != 6);
  	BUILD_BUG_ON(offsetof(struct pqi_iu_layer_descriptor,
  		max_outbound_iu_length) != 14);
  	BUILD_BUG_ON(sizeof(struct pqi_iu_layer_descriptor) != 16);
  
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		data_length) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		iq_arbitration_priority_support_bitmask) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		maximum_aw_a) != 9);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		maximum_aw_b) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		maximum_aw_c) != 11);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_inbound_queues) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_elements_per_iq) != 18);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_iq_element_length) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		min_iq_element_length) != 26);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_outbound_queues) != 30);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_elements_per_oq) != 32);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		intr_coalescing_time_granularity) != 34);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		max_oq_element_length) != 36);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		min_oq_element_length) != 38);
  	BUILD_BUG_ON(offsetof(struct pqi_device_capability,
  		iu_layer_descriptors) != 64);
  	BUILD_BUG_ON(sizeof(struct pqi_device_capability) != 576);
  
  	BUILD_BUG_ON(offsetof(struct pqi_event_descriptor,
  		event_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_event_descriptor,
  		oq_id) != 2);
  	BUILD_BUG_ON(sizeof(struct pqi_event_descriptor) != 4);
  
  	BUILD_BUG_ON(offsetof(struct pqi_event_config,
  		num_event_descriptors) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_event_config,
  		descriptors) != 4);
  
  	BUILD_BUG_ON(PQI_NUM_SUPPORTED_EVENTS !=
  		ARRAY_SIZE(pqi_supported_event_types));
  
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		event_type) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		event_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		additional_event_id) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_event_response,
  		data) != 16);
  	BUILD_BUG_ON(sizeof(struct pqi_event_response) != 32);
  
  	BUILD_BUG_ON(offsetof(struct pqi_event_acknowledge_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_event_acknowledge_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_event_acknowledge_request,
  		event_type) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_event_acknowledge_request,
  		event_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_event_acknowledge_request,
  		additional_event_id) != 12);
  	BUILD_BUG_ON(sizeof(struct pqi_event_acknowledge_request) != 16);
  
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		nexus_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		lun_number) != 16);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		protocol_specific) != 24);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		outbound_queue_id_to_manage) != 26);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		request_id_to_manage) != 28);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_request,
  		task_management_function) != 30);
  	BUILD_BUG_ON(sizeof(struct pqi_task_management_request) != 32);
  
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		header.iu_type) != 0);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		header.iu_length) != 2);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		request_id) != 8);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		nexus_id) != 10);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		additional_response_info) != 12);
  	BUILD_BUG_ON(offsetof(struct pqi_task_management_response,
  		response_code) != 15);
  	BUILD_BUG_ON(sizeof(struct pqi_task_management_response) != 16);
  
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		configured_logical_drive_count) != 0);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		configuration_signature) != 1);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		firmware_version) != 5);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		extended_logical_unit_count) != 154);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		firmware_build_number) != 190);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_controller,
  		controller_mode) != 292);
  
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		phys_bay_in_box) != 115);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		device_type) != 120);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		redundant_path_present_map) != 1736);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		active_path_number) != 1738);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		alternate_paths_phys_connector) != 1739);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		alternate_paths_phys_box_on_port) != 1755);
  	BUILD_BUG_ON(offsetof(struct bmic_identify_physical_device,
  		current_queue_depth_limit) != 1796);
  	BUILD_BUG_ON(sizeof(struct bmic_identify_physical_device) != 2560);
  
  	BUILD_BUG_ON(PQI_ADMIN_IQ_NUM_ELEMENTS > 255);
  	BUILD_BUG_ON(PQI_ADMIN_OQ_NUM_ELEMENTS > 255);
  	BUILD_BUG_ON(PQI_ADMIN_IQ_ELEMENT_LENGTH %
  		PQI_QUEUE_ELEMENT_LENGTH_ALIGNMENT != 0);
  	BUILD_BUG_ON(PQI_ADMIN_OQ_ELEMENT_LENGTH %
  		PQI_QUEUE_ELEMENT_LENGTH_ALIGNMENT != 0);
  	BUILD_BUG_ON(PQI_OPERATIONAL_IQ_ELEMENT_LENGTH > 1048560);
  	BUILD_BUG_ON(PQI_OPERATIONAL_IQ_ELEMENT_LENGTH %
  		PQI_QUEUE_ELEMENT_LENGTH_ALIGNMENT != 0);
  	BUILD_BUG_ON(PQI_OPERATIONAL_OQ_ELEMENT_LENGTH > 1048560);
  	BUILD_BUG_ON(PQI_OPERATIONAL_OQ_ELEMENT_LENGTH %
  		PQI_QUEUE_ELEMENT_LENGTH_ALIGNMENT != 0);
  
  	BUILD_BUG_ON(PQI_RESERVED_IO_SLOTS >= PQI_MAX_OUTSTANDING_REQUESTS);
  	BUILD_BUG_ON(PQI_RESERVED_IO_SLOTS >=
  		PQI_MAX_OUTSTANDING_REQUESTS_KDUMP);
  }
  