text: /*-
   * Copyright (c) 2001 Michael Smith
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	$FreeBSD: src/sys/dev/ciss/ciss.c,v 1.31 2003/11/07 03:01:48 ps Exp $
   */
  
  /*
   * Common Interface for SCSI-3 Support driver.
   *
   * CISS claims to provide a common interface between a generic SCSI
   * transport and an intelligent host adapter.
   *
   * This driver supports CISS as defined in the document "CISS Command
   * Interface for SCSI-3 Support Open Specification", Version 1.04,
   * Valence Number 1, dated 20001127, produced by Compaq Computer
   * Corporation.  This document appears to be a hastily and somewhat
   * arbitrarlily cut-down version of a larger (and probably even more
   * chaotic and inconsistent) Compaq internal document.  Various
   * details were also gleaned from Compaq's "cciss" driver for Linux.
   *
   * We provide a shim layer between the CISS interface and CAM,
   * offloading most of the queueing and being-a-disk chores onto CAM.
   * Entry to the driver is via the PCI bus attachment (ciss_probe,
   * ciss_attach, etc) and via the CAM interface (ciss_cam_action,
   * ciss_cam_poll).  The Compaq CISS adapters are, however, poor SCSI
   * citizens and we have to fake up some responses to get reasonable
   * behaviour out of them.  In addition, the CISS command set is by no
   * means adequate to support the functionality of a RAID controller,
   * and thus the supported Compaq adapters utilise portions of the
   * control protocol from earlier Compaq adapter families.
   *
   * Note that we only support the "simple" transport layer over PCI.
   * This interface (ab)uses the I2O register set (specifically the post
   * queues) to exchange commands with the adapter.  Other interfaces
   * are available, but we aren't supposed to know about them, and it is
   * dubious whether they would provide major performance improvements
   * except under extreme load.
   * 
   * Currently the only supported CISS adapters are the Compaq Smart
   * Array 5* series (5300, 5i, 532).  Even with only three adapters,
   * Compaq still manage to have interface variations.
   *
   *
   * Thanks must go to Fred Harris and Darryl DeVinney at Compaq, as
   * well as Paul Saab at Yahoo! for their assistance in making this
   * driver happen.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/malloc.h>
  #include <sys/kernel.h>
  #include <sys/bus.h>
  #include <sys/conf.h>
  #include <sys/stat.h>
  
  #include <cam/cam.h>
  #include <cam/cam_ccb.h>
  #include <cam/cam_periph.h>
  #include <cam/cam_sim.h>
  #include <cam/cam_xpt_sim.h>
  #include <cam/scsi/scsi_all.h>
  #include <cam/scsi/scsi_message.h>
  
  #include <machine/clock.h>
  #include <machine/bus_memio.h>
  #include <machine/bus.h>
  #include <machine/endian.h>
  #include <machine/resource.h>
  #include <sys/rman.h>
  
  #include <dev/pci/pcireg.h>
  #include <dev/pci/pcivar.h>
  
  #include <dev/ciss/cissreg.h>
  #include <dev/ciss/cissvar.h>
  #include <dev/ciss/cissio.h>
  
  MALLOC_DEFINE(CISS_MALLOC_CLASS, "ciss_data", "ciss internal data buffers");
  
  /* pci interface */
  static int	ciss_lookup(device_t dev);
  static int	ciss_probe(device_t dev);
  static int	ciss_attach(device_t dev);
  static int	ciss_detach(device_t dev);
  static int	ciss_shutdown(device_t dev);
  
  /* (de)initialisation functions, control wrappers */
  static int	ciss_init_pci(struct ciss_softc *sc);
  static int	ciss_wait_adapter(struct ciss_softc *sc);
  static int	ciss_flush_adapter(struct ciss_softc *sc);
  static int	ciss_init_requests(struct ciss_softc *sc);
  static void	ciss_command_map_helper(void *arg, bus_dma_segment_t *segs,
  					int nseg, int error);
  static int	ciss_identify_adapter(struct ciss_softc *sc);
  static int	ciss_init_logical(struct ciss_softc *sc);
  static int	ciss_identify_logical(struct ciss_softc *sc, struct ciss_ldrive *ld);
  static int	ciss_get_ldrive_status(struct ciss_softc *sc,  struct ciss_ldrive *ld);
  static int	ciss_update_config(struct ciss_softc *sc);
  static int	ciss_accept_media(struct ciss_softc *sc, int ldrive, int async);
  static void	ciss_accept_media_complete(struct ciss_request *cr);
  static void	ciss_free(struct ciss_softc *sc);
  
  /* request submission/completion */
  static int	ciss_start(struct ciss_request *cr);
  static void	ciss_done(struct ciss_softc *sc);
  static void	ciss_intr(void *arg);
  static void	ciss_complete(struct ciss_softc *sc);
  static int	ciss_report_request(struct ciss_request *cr, int *command_status,
  				    int *scsi_status);
  static int	ciss_synch_request(struct ciss_request *cr, int timeout);
  static int	ciss_poll_request(struct ciss_request *cr, int timeout);
  static int	ciss_wait_request(struct ciss_request *cr, int timeout);
  #if 0
  static int	ciss_abort_request(struct ciss_request *cr);
  #endif
  
  /* request queueing */
  static int	ciss_get_request(struct ciss_softc *sc, struct ciss_request **crp);
  static void	ciss_preen_command(struct ciss_request *cr);
  static void 	ciss_release_request(struct ciss_request *cr);
  
  /* request helpers */
  static int	ciss_get_bmic_request(struct ciss_softc *sc, struct ciss_request **crp,
  				      int opcode, void **bufp, size_t bufsize);
  static int	ciss_user_command(struct ciss_softc *sc, IOCTL_Command_struct *ioc);
  
  /* DMA map/unmap */
  static int	ciss_map_request(struct ciss_request *cr);
  static void	ciss_request_map_helper(void *arg, bus_dma_segment_t *segs,
  					int nseg, int error);
  static void	ciss_unmap_request(struct ciss_request *cr);
  
  /* CAM interface */
  static int	ciss_cam_init(struct ciss_softc *sc);
  static void	ciss_cam_rescan_target(struct ciss_softc *sc, int target);
  static void	ciss_cam_rescan_all(struct ciss_softc *sc);
  static void	ciss_cam_rescan_callback(struct cam_periph *periph, union ccb *ccb);
  static void	ciss_cam_action(struct cam_sim *sim, union ccb *ccb);
  static int	ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio);
  static int	ciss_cam_emulate(struct ciss_softc *sc, struct ccb_scsiio *csio);
  static void	ciss_cam_poll(struct cam_sim *sim);
  static void	ciss_cam_complete(struct ciss_request *cr);
  static void	ciss_cam_complete_fixup(struct ciss_softc *sc, struct ccb_scsiio *csio);
  static struct cam_periph *ciss_find_periph(struct ciss_softc *sc, int target);
  static int	ciss_name_device(struct ciss_softc *sc, int target);
  
  /* periodic status monitoring */
  static void	ciss_periodic(void *arg);
  static void	ciss_notify_event(struct ciss_softc *sc);
  static void	ciss_notify_complete(struct ciss_request *cr);
  static int	ciss_notify_abort(struct ciss_softc *sc);
  static int	ciss_notify_abort_bmic(struct ciss_softc *sc);
  static void	ciss_notify_logical(struct ciss_softc *sc, struct ciss_notify *cn);
  static void	ciss_notify_physical(struct ciss_softc *sc, struct ciss_notify *cn);
  
  /* debugging output */
  static void	ciss_print_request(struct ciss_request *cr);
  static void	ciss_print_ldrive(struct ciss_softc *sc, struct ciss_ldrive *ld);
  static const char *ciss_name_ldrive_status(int status);
  static int	ciss_decode_ldrive_status(int status);
  static const char *ciss_name_ldrive_org(int org);
  static const char *ciss_name_command_status(int status);
  
  /*
   * PCI bus interface.
   */
  static device_method_t ciss_methods[] = {
      /* Device interface */
      DEVMETHOD(device_probe,	ciss_probe),
      DEVMETHOD(device_attach,	ciss_attach),
      DEVMETHOD(device_detach,	ciss_detach),
      DEVMETHOD(device_shutdown,	ciss_shutdown),
      { 0, 0 }
  };
  
  static driver_t ciss_pci_driver = {
      "ciss",
      ciss_methods,
      sizeof(struct ciss_softc)
  };
  
  static devclass_t	ciss_devclass;
  DRIVER_MODULE(ciss, pci, ciss_pci_driver, ciss_devclass, 0, 0);
  
  /*
   * Control device interface.
   */
  static d_open_t		ciss_open;
  static d_close_t	ciss_close;
  static d_ioctl_t	ciss_ioctl;
  
  #define CISS_CDEV_MAJOR  166
  
  static struct cdevsw ciss_cdevsw = {
  	.d_open =	ciss_open,
  	.d_close =	ciss_close,
  	.d_ioctl =	ciss_ioctl,
  	.d_name =	"ciss",
  	.d_maj =	CISS_CDEV_MAJOR,
  };
  
  /************************************************************************
   * CISS adapters amazingly don't have a defined programming interface
   * value.  (One could say some very despairing things about PCI and
   * people just not getting the general idea.)  So we are forced to
   * stick with matching against subvendor/subdevice, and thus have to
   * be updated for every new CISS adapter that appears.
   */
  #define CISS_BOARD_SA5	(1<<0)
  #define CISS_BOARD_SA5B	(1<<1)
  
  static struct
  {
      u_int16_t	subvendor;
      u_int16_t	subdevice;
      int		flags;
      char	*desc;
  } ciss_vendor_data[] = {
      { 0x0e11, 0x4070, CISS_BOARD_SA5,	"Compaq Smart Array 5300" },
      { 0x0e11, 0x4080, CISS_BOARD_SA5B,	"Compaq Smart Array 5i" },
      { 0x0e11, 0x4082, CISS_BOARD_SA5B,	"Compaq Smart Array 532" },
      { 0x0e11, 0x4083, CISS_BOARD_SA5B,	"HP Smart Array 5312" },
      { 0x0e11, 0x4091, CISS_BOARD_SA5,	"HP Smart Array 6i" },
      { 0x0e11, 0x409A, CISS_BOARD_SA5,	"HP Smart Array 641" },
      { 0x0e11, 0x409B, CISS_BOARD_SA5,	"HP Smart Array 642" },
      { 0x0e11, 0x409C, CISS_BOARD_SA5,	"HP Smart Array 6400" },
      { 0x0e11, 0x409D, CISS_BOARD_SA5,	"HP Smart Array 6400 EM" },
      { 0, 0, 0, NULL }
  };
  
  /************************************************************************
   * Find a match for the device in our list of known adapters.
   */
  static int
  ciss_lookup(device_t dev)
  {
      int 	i;
      
      for (i = 0; ciss_vendor_data[i].desc != NULL; i++)
  	if ((pci_get_subvendor(dev) == ciss_vendor_data[i].subvendor) &&
  	    (pci_get_subdevice(dev) == ciss_vendor_data[i].subdevice)) {
  	    return(i);
  	}
      return(-1);
  }
  
  /************************************************************************
   * Match a known CISS adapter.
   */
  static int
  ciss_probe(device_t dev)
  {
      int		i;
      
      i = ciss_lookup(dev);
      if (i != -1) {
  	device_set_desc(dev, ciss_vendor_data[i].desc);
  	return(-10);
      }
      return(ENOENT);
  }	
  
  /************************************************************************
   * Attach the driver to this adapter.
   */
  static int
  ciss_attach(device_t dev)
  {
      struct ciss_softc	*sc;
      int			i, error;
  
      debug_called(1);
  
  #ifdef CISS_DEBUG
      /* print structure/union sizes */
      debug_struct(ciss_command);
      debug_struct(ciss_header);
      debug_union(ciss_device_address);
      debug_struct(ciss_cdb);
      debug_struct(ciss_report_cdb);
      debug_struct(ciss_notify_cdb);
      debug_struct(ciss_notify);
      debug_struct(ciss_message_cdb);
      debug_struct(ciss_error_info_pointer);
      debug_struct(ciss_error_info);
      debug_struct(ciss_sg_entry);
      debug_struct(ciss_config_table);
      debug_struct(ciss_bmic_cdb);
      debug_struct(ciss_bmic_id_ldrive);
      debug_struct(ciss_bmic_id_lstatus);
      debug_struct(ciss_bmic_id_table);
      debug_struct(ciss_bmic_id_pdrive);
      debug_struct(ciss_bmic_blink_pdrive);
      debug_struct(ciss_bmic_flush_cache);
      debug_const(CISS_MAX_REQUESTS);
      debug_const(CISS_MAX_LOGICAL);
      debug_const(CISS_INTERRUPT_COALESCE_DELAY);
      debug_const(CISS_INTERRUPT_COALESCE_COUNT);
      debug_const(CISS_COMMAND_ALLOC_SIZE);
      debug_const(CISS_COMMAND_SG_LENGTH);
  
      debug_type(cciss_pci_info_struct);
      debug_type(cciss_coalint_struct);
      debug_type(cciss_coalint_struct);
      debug_type(NodeName_type);
      debug_type(NodeName_type);
      debug_type(Heartbeat_type);
      debug_type(BusTypes_type);
      debug_type(FirmwareVer_type);
      debug_type(DriverVer_type);
      debug_type(IOCTL_Command_struct);
  #endif
  
      sc = device_get_softc(dev);
      sc->ciss_dev = dev;
  
      /*
       * Work out adapter type.
       */
      i = ciss_lookup(dev);
      if (ciss_vendor_data[i].flags & CISS_BOARD_SA5) {
  	sc->ciss_interrupt_mask = CISS_TL_SIMPLE_INTR_OPQ_SA5;
      } else if (ciss_vendor_data[i].flags & CISS_BOARD_SA5B) {
  	sc->ciss_interrupt_mask = CISS_TL_SIMPLE_INTR_OPQ_SA5B;
      } else {
  	/* really an error on our part */
  	ciss_printf(sc, "unable to determine hardware type\n");
  	error = ENXIO;
  	goto out;
      }
  	
      /*
       * Do PCI-specific init.
       */
      if ((error = ciss_init_pci(sc)) != 0)
  	goto out;
  
      /*
       * Initialise driver queues.
       */
      ciss_initq_free(sc);
      ciss_initq_busy(sc);
      ciss_initq_complete(sc);
  
      /*
       * Initialise command/request pool.
       */
      if ((error = ciss_init_requests(sc)) != 0)
  	goto out;
  
      /*
       * Get adapter information.
       */
      if ((error = ciss_identify_adapter(sc)) != 0)
  	goto out;
      
      /*
       * Build our private table of logical devices.
       */
      if ((error = ciss_init_logical(sc)) != 0)
  	goto out;
  
      /*
       * Enable interrupts so that the CAM scan can complete.
       */
      CISS_TL_SIMPLE_ENABLE_INTERRUPTS(sc);
  
      /*
       * Initialise the CAM interface.
       */
      if ((error = ciss_cam_init(sc)) != 0)
  	goto out;
  
      /*
       * Start the heartbeat routine and event chain.
       */
      ciss_periodic(sc);
  
     /*
       * Create the control device.
       */
      sc->ciss_dev_t = make_dev(&ciss_cdevsw, device_get_unit(sc->ciss_dev),
  			      UID_ROOT, GID_OPERATOR, S_IRUSR | S_IWUSR,
  			      "ciss%d", device_get_unit(sc->ciss_dev));
      sc->ciss_dev_t->si_drv1 = sc;
  
      /*
       * The adapter is running; synchronous commands can now sleep
       * waiting for an interrupt to signal completion.
       */
      sc->ciss_flags |= CISS_FLAG_RUNNING;
  
      error = 0;
   out:
      if (error != 0)
  	ciss_free(sc);
      return(error);
  }
  
  /************************************************************************
   * Detach the driver from this adapter.
   */
  static int
  ciss_detach(device_t dev)
  {
      struct ciss_softc	*sc = device_get_softc(dev);
  
      debug_called(1);
      
      /* flush adapter cache */
      ciss_flush_adapter(sc);
  
      destroy_dev(sc->ciss_dev_t);
  
      /* release all resources */
      ciss_free(sc);
  
      return(0);
      
  }
  
  /************************************************************************
   * Prepare adapter for system shutdown.
   */
  static int
  ciss_shutdown(device_t dev)
  {
      struct ciss_softc	*sc = device_get_softc(dev);
  
      debug_called(1);
  
      /* flush adapter cache */
      ciss_flush_adapter(sc);
  
      return(0);
  }
  
  /************************************************************************
   * Perform PCI-specific attachment actions.
   */
  static int
  ciss_init_pci(struct ciss_softc *sc)
  {
      uintptr_t		cbase, csize, cofs;
      int			error;
  
      debug_called(1);
  
      /*
       * Allocate register window first (we need this to find the config
       * struct).
       */
      error = ENXIO;
      sc->ciss_regs_rid = CISS_TL_SIMPLE_BAR_REGS;
      if ((sc->ciss_regs_resource =
  	 bus_alloc_resource(sc->ciss_dev, SYS_RES_MEMORY, &sc->ciss_regs_rid,
  			    0, ~0, 1, RF_ACTIVE)) == NULL) {
  	ciss_printf(sc, "can't allocate register window\n");
  	return(ENXIO);
      }
      sc->ciss_regs_bhandle = rman_get_bushandle(sc->ciss_regs_resource);
      sc->ciss_regs_btag = rman_get_bustag(sc->ciss_regs_resource);
      
      /*
       * Find the BAR holding the config structure.  If it's not the one
       * we already mapped for registers, map it too.
       */
      sc->ciss_cfg_rid = CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_CFG_BAR) & 0xffff;
      if (sc->ciss_cfg_rid != sc->ciss_regs_rid) {
  	if ((sc->ciss_cfg_resource =
  	     bus_alloc_resource(sc->ciss_dev, SYS_RES_MEMORY, &sc->ciss_cfg_rid,
  				0, ~0, 1, RF_ACTIVE)) == NULL) {
  	    ciss_printf(sc, "can't allocate config window\n");
  	    return(ENXIO);
  	}
  	cbase = (uintptr_t)rman_get_virtual(sc->ciss_cfg_resource);
  	csize = rman_get_end(sc->ciss_cfg_resource) -
  	    rman_get_start(sc->ciss_cfg_resource) + 1;
      } else {
  	cbase = (uintptr_t)rman_get_virtual(sc->ciss_regs_resource);
  	csize = rman_get_end(sc->ciss_regs_resource) -
  	    rman_get_start(sc->ciss_regs_resource) + 1;
      }
      cofs = CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_CFG_OFF);
      
      /*
       * Use the base/size/offset values we just calculated to
       * sanity-check the config structure.  If it's OK, point to it.
       */
      if ((cofs + sizeof(struct ciss_config_table)) > csize) {
  	ciss_printf(sc, "config table outside window\n");
  	return(ENXIO);
      }
      sc->ciss_cfg = (struct ciss_config_table *)(cbase + cofs);
      debug(1, "config struct at %p", sc->ciss_cfg);
      
      /*
       * Validate the config structure.  If we supported other transport
       * methods, we could select amongst them at this point in time.
       */
      if (strncmp(sc->ciss_cfg->signature, "CISS", 4)) {
  	ciss_printf(sc, "config signature mismatch (got '%c%c%c%c')\n",
  		    sc->ciss_cfg->signature[0], sc->ciss_cfg->signature[1],
  		    sc->ciss_cfg->signature[2], sc->ciss_cfg->signature[3]);
  	return(ENXIO);
      }
      if ((sc->ciss_cfg->valence < CISS_MIN_VALENCE) ||
  	(sc->ciss_cfg->valence > CISS_MAX_VALENCE)) {
  	ciss_printf(sc, "adapter interface specification (%d) unsupported\n", 
  		    sc->ciss_cfg->valence);
  	return(ENXIO);
      }
  
      /*
       * Put the board into simple mode, and tell it we're using the low
       * 4GB of RAM.  Set the default interrupt coalescing options.
       */
      if (!(sc->ciss_cfg->supported_methods & CISS_TRANSPORT_METHOD_SIMPLE)) {
  	ciss_printf(sc, "adapter does not support 'simple' transport layer\n");
  	return(ENXIO);
      }
      sc->ciss_cfg->requested_method = CISS_TRANSPORT_METHOD_SIMPLE;
      sc->ciss_cfg->command_physlimit = 0;
      sc->ciss_cfg->interrupt_coalesce_delay = CISS_INTERRUPT_COALESCE_DELAY;
      sc->ciss_cfg->interrupt_coalesce_count = CISS_INTERRUPT_COALESCE_COUNT;
  
      if (ciss_update_config(sc)) {
  	ciss_printf(sc, "adapter refuses to accept config update (IDBR 0x%x)\n",
  		    CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_IDBR));
  	return(ENXIO);
      }
      if (!(sc->ciss_cfg->active_method != CISS_TRANSPORT_METHOD_SIMPLE)) {
  	ciss_printf(sc,
  		    "adapter refuses to go into 'simple' transport mode (0x%x, 0x%x)\n",
  		    sc->ciss_cfg->supported_methods, sc->ciss_cfg->active_method);
  	return(ENXIO);
      }
  
      /*
       * Wait for the adapter to come ready.
       */
      if ((error = ciss_wait_adapter(sc)) != 0)
  	return(error);
  
      /*
       * Turn off interrupts before we go routing anything.
       */
      CISS_TL_SIMPLE_DISABLE_INTERRUPTS(sc);
      
      /*
       * Allocate and set up our interrupt.
       */
      sc->ciss_irq_rid = 0;
      if ((sc->ciss_irq_resource =
  	 bus_alloc_resource(sc->ciss_dev, SYS_RES_IRQ, &sc->ciss_irq_rid, 0, ~0, 1, 
  			    RF_ACTIVE | RF_SHAREABLE)) == NULL) {
  	ciss_printf(sc, "can't allocate interrupt\n");
  	return(ENXIO);
      }
      if (bus_setup_intr(sc->ciss_dev, sc->ciss_irq_resource, INTR_TYPE_CAM, ciss_intr, sc,
  		       &sc->ciss_intr)) {
  	ciss_printf(sc, "can't set up interrupt\n");
  	return(ENXIO);
      }
  
      /*
       * Allocate the parent bus DMA tag appropriate for our PCI
       * interface.
       * 
       * Note that "simple" adapters can only address within a 32-bit
       * span.
       */
      if (bus_dma_tag_create(NULL, 			/* parent */
  			   1, 0, 			/* alignment, boundary */
  			   BUS_SPACE_MAXADDR,		/* lowaddr */
  			   BUS_SPACE_MAXADDR, 		/* highaddr */
  			   NULL, NULL, 			/* filter, filterarg */
  			   BUS_SPACE_MAXSIZE_32BIT,	/* maxsize */
  			   CISS_COMMAND_SG_LENGTH,	/* nsegments */
  			   BUS_SPACE_MAXSIZE_32BIT,	/* maxsegsize */
  			   BUS_DMA_ALLOCNOW,		/* flags */
  			   NULL, NULL,			/* lockfunc, lockarg */
  			   &sc->ciss_parent_dmat)) {
  	ciss_printf(sc, "can't allocate parent DMA tag\n");
  	return(ENOMEM);
      }
  
      /*
       * Create DMA tag for mapping buffers into adapter-addressable
       * space.
       */
      if (bus_dma_tag_create(sc->ciss_parent_dmat, 	/* parent */
  			   1, 0, 			/* alignment, boundary */
  			   BUS_SPACE_MAXADDR,		/* lowaddr */
  			   BUS_SPACE_MAXADDR, 		/* highaddr */
  			   NULL, NULL, 			/* filter, filterarg */
  			   MAXBSIZE, CISS_COMMAND_SG_LENGTH,	/* maxsize, nsegments */
  			   BUS_SPACE_MAXSIZE_32BIT,	/* maxsegsize */
  			   0,				/* flags */
  			   busdma_lock_mutex, &Giant,	/* lockfunc, lockarg */
  			   &sc->ciss_buffer_dmat)) {
  	ciss_printf(sc, "can't allocate buffer DMA tag\n");
  	return(ENOMEM);
      }
      return(0);
  }
  
  /************************************************************************
   * Wait for the adapter to come ready.
   */
  static int
  ciss_wait_adapter(struct ciss_softc *sc)
  {
      int		i;
  
      debug_called(1);
      
      /*
       * Wait for the adapter to come ready.
       */
      if (!(sc->ciss_cfg->active_method & CISS_TRANSPORT_METHOD_READY)) {
  	ciss_printf(sc, "waiting for adapter to come ready...\n");
  	for (i = 0; !(sc->ciss_cfg->active_method & CISS_TRANSPORT_METHOD_READY); i++) {
  	    DELAY(1000000);	/* one second */
  	    if (i > 30) {
  		ciss_printf(sc, "timed out waiting for adapter to come ready\n");
  		return(EIO);
  	    }
  	}
      }
      return(0);
  }
  
  /************************************************************************
   * Flush the adapter cache.
   */
  static int
  ciss_flush_adapter(struct ciss_softc *sc)
  {
      struct ciss_request			*cr;
      struct ciss_bmic_flush_cache	*cbfc;
      int					error, command_status;
  
      debug_called(1);
  
      cr = NULL;
      cbfc = NULL;
  
      /*
       * Build a BMIC request to flush the cache.  We don't disable
       * it, as we may be going to do more I/O (eg. we are emulating
       * the Synchronise Cache command).
       */
      if ((cbfc = malloc(sizeof(*cbfc), CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
  	error = ENOMEM;
  	goto out;
      }
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_FLUSH_CACHE,
  				       (void **)&cbfc, sizeof(*cbfc))) != 0)
  	goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending BMIC FLUSH_CACHE command (%d)\n", error);
  	goto out;
      }
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
  	break;
      default:
  	ciss_printf(sc, "error flushing cache (%s)\n",  
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
  
  out:
      if (cbfc != NULL)
  	free(cbfc, CISS_MALLOC_CLASS);
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Allocate memory for the adapter command structures, initialise
   * the request structures.
   *
   * Note that the entire set of commands are allocated in a single
   * contiguous slab.
   */
  static int
  ciss_init_requests(struct ciss_softc *sc)
  {
      struct ciss_request	*cr;
      int			i;
  
      debug_called(1);
      
      /*
       * Calculate the number of request structures/commands we are
       * going to provide for this adapter.
       */
      sc->ciss_max_requests = min(CISS_MAX_REQUESTS, sc->ciss_cfg->max_outstanding_commands);
      
      if (bootverbose)
  	ciss_printf(sc, "using %d of %d available commands\n",
  		    sc->ciss_max_requests, sc->ciss_cfg->max_outstanding_commands);
  
      /*
       * Create the DMA tag for commands.
       */
      if (bus_dma_tag_create(sc->ciss_parent_dmat,	/* parent */
  			   1, 0, 			/* alignment, boundary */
  			   BUS_SPACE_MAXADDR_32BIT,	/* lowaddr */
  			   BUS_SPACE_MAXADDR, 		/* highaddr */
  			   NULL, NULL, 			/* filter, filterarg */
  			   CISS_COMMAND_ALLOC_SIZE * 
  			   sc->ciss_max_requests, 1,	/* maxsize, nsegments */
  			   BUS_SPACE_MAXSIZE_32BIT,	/* maxsegsize */
  			   BUS_DMA_ALLOCNOW,		/* flags */
  			   NULL, NULL,			/* lockfunc, lockarg */
  			   &sc->ciss_command_dmat)) {
  	ciss_printf(sc, "can't allocate command DMA tag\n");
  	return(ENOMEM);
      }
      /*
       * Allocate memory and make it available for DMA.
       */
      if (bus_dmamem_alloc(sc->ciss_command_dmat, (void **)&sc->ciss_command, 
  			 BUS_DMA_NOWAIT, &sc->ciss_command_map)) {
  	ciss_printf(sc, "can't allocate command memory\n");
  	return(ENOMEM);
      }
      bus_dmamap_load(sc->ciss_command_dmat, sc->ciss_command_map, sc->ciss_command, 
  		    CISS_COMMAND_ALLOC_SIZE * sc->ciss_max_requests,
  		    ciss_command_map_helper, sc, 0);
      bzero(sc->ciss_command, CISS_COMMAND_ALLOC_SIZE * sc->ciss_max_requests);
  
      /*
       * Set up the request and command structures, push requests onto
       * the free queue.
       */
      for (i = 1; i < sc->ciss_max_requests; i++) {
  	cr = &sc->ciss_request[i];
  	cr->cr_sc = sc;
  	cr->cr_tag = i;
  	bus_dmamap_create(sc->ciss_buffer_dmat, 0, &cr->cr_datamap);
  	ciss_enqueue_free(cr);
      }
      return(0);
  }
  
  static void
  ciss_command_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  {
      struct ciss_softc	*sc = (struct ciss_softc *)arg;
  
      sc->ciss_command_phys = segs->ds_addr;
  }
  
  /************************************************************************
   * Identify the adapter, print some information about it.
   */
  static int
  ciss_identify_adapter(struct ciss_softc *sc)
  {
      struct ciss_request	*cr;
      int			error, command_status;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Get a request, allocate storage for the adapter data.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_CTLR,
  				       (void **)&sc->ciss_id,
  				       sizeof(*sc->ciss_id))) != 0)
  	goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending BMIC ID_CTLR command (%d)\n", error);
  	goto out;
      }
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:		/* buffer right size */
  	break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	ciss_printf(sc, "data over/underrun reading adapter information\n");
      default:
  	ciss_printf(sc, "error reading adapter information (%s)\n",
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
  
      /* sanity-check reply */
      if (!sc->ciss_id->big_map_supported) {
  	ciss_printf(sc, "adapter does not support BIG_MAP\n");
  	error = ENXIO;
  	goto out;
      }
  
  #if 0
      /* XXX later revisions may not need this */
      sc->ciss_flags |= CISS_FLAG_FAKE_SYNCH;
  #endif
  
      /* XXX only really required for old 5300 adapters? */
      sc->ciss_flags |= CISS_FLAG_BMIC_ABORT;
      
      /* print information */
      if (bootverbose) {
  	ciss_printf(sc, "  %d logical drive%s configured\n",
  		    sc->ciss_id->configured_logical_drives,
  		    (sc->ciss_id->configured_logical_drives == 1) ? "" : "s");
  	ciss_printf(sc, "  firmware %4.4s\n", sc->ciss_id->running_firmware_revision);
  	ciss_printf(sc, "  %d SCSI channels\n", sc->ciss_id->scsi_bus_count);
  
  	ciss_printf(sc, "  signature '%.4s'\n", sc->ciss_cfg->signature);
  	ciss_printf(sc, "  valence %d\n", sc->ciss_cfg->valence);
  	ciss_printf(sc, "  supported I/O methods 0x%b\n",
  		    sc->ciss_cfg->supported_methods, 
  		    "\20\1READY\2simple\3performant\4MEMQ\n");
  	ciss_printf(sc, "  active I/O method 0x%b\n",
  		    sc->ciss_cfg->active_method, "\20\2simple\3performant\4MEMQ\n");
  	ciss_printf(sc, "  4G page base 0x%08x\n",
  		    sc->ciss_cfg->command_physlimit);
  	ciss_printf(sc, "  interrupt coalesce delay %dus\n",
  		    sc->ciss_cfg->interrupt_coalesce_delay);
  	ciss_printf(sc, "  interrupt coalesce count %d\n",
  		    sc->ciss_cfg->interrupt_coalesce_count);
  	ciss_printf(sc, "  max outstanding commands %d\n",
  		    sc->ciss_cfg->max_outstanding_commands);
  	ciss_printf(sc, "  bus types 0x%b\n", sc->ciss_cfg->bus_types, 
  		    "\20\1ultra2\2ultra3\10fibre1\11fibre2\n");
  	ciss_printf(sc, "  server name '%.16s'\n", sc->ciss_cfg->server_name);
  	ciss_printf(sc, "  heartbeat 0x%x\n", sc->ciss_cfg->heartbeat);
      }
  
  out:
      if (error) {
  	if (sc->ciss_id != NULL) {
  	    free(sc->ciss_id, CISS_MALLOC_CLASS);
  	    sc->ciss_id = NULL;
  	}
      }	
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Find logical drives on the adapter.
   */
  static int
  ciss_init_logical(struct ciss_softc *sc)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_report_cdb	*crc;
      struct ciss_lun_report	*cll;
      int				error, i;
      size_t			report_size;
      int				ndrives;
      int				command_status;
  
      debug_called(1);
  
      cr = NULL;
      cll = NULL;
  
      /*
       * Get a request, allocate storage for the address list.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0)
  	goto out;
      report_size = sizeof(*cll) + CISS_MAX_LOGICAL * sizeof(union ciss_device_address);
      if ((cll = malloc(report_size, CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
  	ciss_printf(sc, "can't allocate memory for logical drive list\n");
  	error = ENOMEM;
  	goto out;
      }
  
      /*
       * Build the Report Logical LUNs command.
       */
      cc = CISS_FIND_COMMAND(cr);
      cr->cr_data = cll;
      cr->cr_length = report_size;
      cr->cr_flags = CISS_REQ_DATAIN;
      
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*crc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 30;	/* XXX better suggestions? */
  
      crc = (struct ciss_report_cdb *)&(cc->cdb.cdb[0]);
      bzero(crc, sizeof(*crc));
      crc->opcode = CISS_OPCODE_REPORT_LOGICAL_LUNS;
      crc->length = htonl(report_size);			/* big-endian field */
      cll->list_size = htonl(report_size - sizeof(*cll));	/* big-endian field */
      
      /*
       * Submit the request and wait for it to complete.  (timeout
       * here should be much greater than above)
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending Report Logical LUNs command (%d)\n", error);
  	goto out;
      }
  
      /*
       * Check response.  Note that data over/underrun is OK.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:	/* buffer right size */
      case CISS_CMD_STATUS_DATA_UNDERRUN:	/* buffer too large, not bad */
  	break;
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	ciss_printf(sc, "WARNING: more logical drives than driver limit (%d), adjust CISS_MAX_LOGICAL\n",
  		    CISS_MAX_LOGICAL);
  	break;
      default:
  	ciss_printf(sc, "error detecting logical drive configuration (%s)\n",
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
      ciss_release_request(cr);
      cr = NULL;
  
      /* sanity-check reply */
      ndrives = (ntohl(cll->list_size) / sizeof(union ciss_device_address));
      if ((ndrives < 0) || (ndrives >= CISS_MAX_LOGICAL)) {
  	ciss_printf(sc, "adapter claims to report absurd number of logical drives (%d > %d)\n",
  		    ndrives, CISS_MAX_LOGICAL);
  	return(ENXIO);
      }
  
      /*
       * Save logical drive information.
       */
      if (bootverbose)
  	ciss_printf(sc, "%d logical drive%s\n", ndrives, (ndrives > 1) ? "s" : "");
      if (ndrives != sc->ciss_id->configured_logical_drives)
  	ciss_printf(sc, "logical drive map claims %d drives, but adapter claims %d\n",
  		    ndrives, sc->ciss_id->configured_logical_drives);
      for (i = 0; i < CISS_MAX_LOGICAL; i++) {
  	if (i < ndrives) {
  	    sc->ciss_logical[i].cl_address = cll->lun[i];	/* XXX endianness? */
  	    if (ciss_identify_logical(sc, &sc->ciss_logical[i]) != 0)
  		continue;
  	    /*
  	     * If the drive has had media exchanged, we should bring it online.
  	     */
  	    if (sc->ciss_logical[i].cl_lstatus->media_exchanged)
  		ciss_accept_media(sc, i, 0);
  
  	} else {
  	    sc->ciss_logical[i].cl_status = CISS_LD_NONEXISTENT;
  	}
      }
      error = 0;
      
   out:
      /*
       * Note that if the error is a timeout, we are taking a slight
       * risk here and assuming that the adapter will not respond at a
       * later time, scribbling over host memory.
       */
      if (cr != NULL)
  	ciss_release_request(cr);
      if (cll != NULL)
  	free(cll, CISS_MALLOC_CLASS);
      return(error);
  }
  
  static int
  ciss_inquiry_logical(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      struct ciss_request			*cr;
      struct ciss_command			*cc;
      struct scsi_inquiry			*inq;
      int					error;
      int					command_status;
      int					lun;
  
      cr = NULL;
      lun = ld->cl_address.logical.lun;
  
      bzero(&ld->cl_geometry, sizeof(ld->cl_geometry));
  
      if ((error = ciss_get_request(sc, &cr)) != 0)
  	goto out;
  
      cc = CISS_FIND_COMMAND(cr);
      cr->cr_data = &ld->cl_geometry;
      cr->cr_length = sizeof(ld->cl_geometry);
      cr->cr_flags = CISS_REQ_DATAIN;
  
      cc->header.address.logical.mode = CISS_HDR_ADDRESS_MODE_LOGICAL;
      cc->header.address.logical.lun  = lun;
      cc->cdb.cdb_length = 6;
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 30;
  
      inq = (struct scsi_inquiry *)&(cc->cdb.cdb[0]);
      inq->opcode = INQUIRY;
      inq->byte2 = SI_EVPD;
      inq->page_code = CISS_VPD_LOGICAL_DRIVE_GEOMETRY;
      inq->length = sizeof(ld->cl_geometry);
  
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error getting geometry (%d)\n", error);
  	goto out;
      }
  
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
      case CISS_CMD_STATUS_DATA_UNDERRUN:
  	break;
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	ciss_printf(sc, "WARNING: Data overrun\n");
  	break;
      default:
  	ciss_printf(sc, "Error detecting logical drive geometry (%s)\n",
  		    ciss_name_command_status(command_status));
  	break;
      }
  
  out:
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  /************************************************************************
   * Identify a logical drive, initialise state related to it.
   */
  static int
  ciss_identify_logical(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_bmic_cdb	*cbc;
      int				error, command_status;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Build a BMIC request to fetch the drive ID.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_LDRIVE,
  				       (void **)&ld->cl_ldrive, 
  				       sizeof(*ld->cl_ldrive))) != 0)
  	goto out;
      cc = CISS_FIND_COMMAND(cr);
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = ld->cl_address.logical.lun;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending BMIC LDRIVE command (%d)\n", error);
  	goto out;
      }
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:		/* buffer right size */
  	break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	ciss_printf(sc, "data over/underrun reading logical drive ID\n");
      default:
  	ciss_printf(sc, "error reading logical drive ID (%s)\n",
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
      ciss_release_request(cr);
      cr = NULL;
  
      /*
       * Build a CISS BMIC command to get the logical drive status.
       */
      if ((error = ciss_get_ldrive_status(sc, ld)) != 0)
  	goto out;
  
      /*
       * Get the logical drive geometry.
       */
      if ((error = ciss_inquiry_logical(sc, ld)) != 0)
  	goto out;
  
      /*
       * Print the drive's basic characteristics.
       */
      if (bootverbose) {
  	ciss_printf(sc, "logical drive %d: %s, %dMB ",
  		    ld->cl_address.logical.lun,
  		    ciss_name_ldrive_org(ld->cl_ldrive->fault_tolerance),
  		    ((ld->cl_ldrive->blocks_available / (1024 * 1024)) *
  		     ld->cl_ldrive->block_size));
  
  	ciss_print_ldrive(sc, ld);
      }
  out:
      if (error != 0) {
  	/* make the drive not-exist */
  	ld->cl_status = CISS_LD_NONEXISTENT;
  	if (ld->cl_ldrive != NULL) {
  	    free(ld->cl_ldrive, CISS_MALLOC_CLASS);
  	    ld->cl_ldrive = NULL;
  	}
  	if (ld->cl_lstatus != NULL) {
  	    free(ld->cl_lstatus, CISS_MALLOC_CLASS);
  	    ld->cl_lstatus = NULL;
  	}
      }
      if (cr != NULL)
  	ciss_release_request(cr);
  	
      return(error);
  }
  
  /************************************************************************
   * Get status for a logical drive.
   *
   * XXX should we also do this in response to Test Unit Ready?
   */
  static int
  ciss_get_ldrive_status(struct ciss_softc *sc,  struct ciss_ldrive *ld)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_bmic_cdb	*cbc;
      int				error, command_status;
  
      /*
       * Build a CISS BMIC command to get the logical drive status.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_LSTATUS,
  				       (void **)&ld->cl_lstatus, 
  				       sizeof(*ld->cl_lstatus))) != 0)
  	goto out;
      cc = CISS_FIND_COMMAND(cr);
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = ld->cl_address.logical.lun;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending BMIC LSTATUS command (%d)\n", error);
  	goto out;
      }
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:		/* buffer right size */
  	break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	ciss_printf(sc, "data over/underrun reading logical drive status\n");
      default:
  	ciss_printf(sc, "error reading logical drive status (%s)\n",
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
  
      /*
       * Set the drive's summary status based on the returned status.
       *
       * XXX testing shows that a failed JBOD drive comes back at next 
       * boot in "queued for expansion" mode.  WTF?
       */
      ld->cl_status = ciss_decode_ldrive_status(ld->cl_lstatus->status);
  
  out:
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Notify the adapter of a config update.
   */
  static int
  ciss_update_config(struct ciss_softc *sc)
  {
      int		i;
  
      debug_called(1);
  
      CISS_TL_SIMPLE_WRITE(sc, CISS_TL_SIMPLE_IDBR, CISS_TL_SIMPLE_IDBR_CFG_TABLE);
      for (i = 0; i < 1000; i++) {
  	if (!(CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_IDBR) &
  	      CISS_TL_SIMPLE_IDBR_CFG_TABLE)) {
  	    return(0);
  	}
  	DELAY(1000);
      }
      return(1);
  }
  
  /************************************************************************
   * Accept new media into a logical drive.
   *
   * XXX The drive has previously been offline; it would be good if we
   *     could make sure it's not open right now.
   */
  static int
  ciss_accept_media(struct ciss_softc *sc, int ldrive, int async)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_bmic_cdb	*cbc;
      int				error;
  
      debug(0, "bringing logical drive %d back online %ssynchronously", 
  	  ldrive, async ? "a" : "");
  
      /*
       * Build a CISS BMIC command to bring the drive back online.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ACCEPT_MEDIA,
  				       NULL, 0)) != 0)
  	goto out;
      cc = CISS_FIND_COMMAND(cr);
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = ldrive;
  
      /*
       * Dispatch the request asynchronously if we can't sleep waiting
       * for it to complete.
       */
      if (async) {
  	cr->cr_complete = ciss_accept_media_complete;
  	if ((error = ciss_start(cr)) != 0)
  	    goto out;
  	return(0);
      } else {
  	/*
  	 * Submit the request and wait for it to complete.
  	 */
  	if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	    ciss_printf(sc, "error sending BMIC LSTATUS command (%d)\n", error);
  	    goto out;
  	}
      }
  
      /*
       * Call the completion callback manually.
       */
      ciss_accept_media_complete(cr);
      return(0);
      
  out:
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  static void
  ciss_accept_media_complete(struct ciss_request *cr)
  {
      int				command_status;
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:		/* all OK */
  	/* we should get a logical drive status changed event here */
  	break;
      default:
  	ciss_printf(cr->cr_sc, "error accepting media into failed logical drive (%s)\n",
  		    ciss_name_command_status(command_status));
  	break;
      }
      ciss_release_request(cr);
  }
  
  /************************************************************************
   * Release adapter resources.
   */
  static void
  ciss_free(struct ciss_softc *sc)
  {
      struct ciss_request *cr;
  
      debug_called(1);
  
      /* we're going away */
      sc->ciss_flags |= CISS_FLAG_ABORTING;
  
      /* terminate the periodic heartbeat routine */
      untimeout(ciss_periodic, sc, sc->ciss_periodic);
  
      /* cancel the Event Notify chain */
      ciss_notify_abort(sc);
      
      /* free the controller data */
      if (sc->ciss_id != NULL)
  	free(sc->ciss_id, CISS_MALLOC_CLASS);
  
      /* release I/O resources */
      if (sc->ciss_regs_resource != NULL)
  	bus_release_resource(sc->ciss_dev, SYS_RES_MEMORY,
  			     sc->ciss_regs_rid, sc->ciss_regs_resource);
      if (sc->ciss_cfg_resource != NULL)
  	bus_release_resource(sc->ciss_dev, SYS_RES_MEMORY,
  			     sc->ciss_cfg_rid, sc->ciss_cfg_resource);
      if (sc->ciss_intr != NULL)
  	bus_teardown_intr(sc->ciss_dev, sc->ciss_irq_resource, sc->ciss_intr);
      if (sc->ciss_irq_resource != NULL)
  	bus_release_resource(sc->ciss_dev, SYS_RES_IRQ,
  			     sc->ciss_irq_rid, sc->ciss_irq_resource);
  
      /* destroy DMA tags */
      if (sc->ciss_parent_dmat)
  	bus_dma_tag_destroy(sc->ciss_parent_dmat);
  
      while ((cr = ciss_dequeue_free(sc)) != NULL)
  	bus_dmamap_destroy(sc->ciss_buffer_dmat, cr->cr_datamap);
      if (sc->ciss_buffer_dmat)
  	bus_dma_tag_destroy(sc->ciss_buffer_dmat);
  
      /* destroy command memory and DMA tag */
      if (sc->ciss_command != NULL) {
  	bus_dmamap_unload(sc->ciss_command_dmat, sc->ciss_command_map);
  	bus_dmamem_free(sc->ciss_command_dmat, sc->ciss_command, sc->ciss_command_map);
      }
      if (sc->ciss_command_dmat)
  	bus_dma_tag_destroy(sc->ciss_command_dmat);
  
      /* disconnect from CAM */
      if (sc->ciss_cam_sim) {
  	xpt_bus_deregister(cam_sim_path(sc->ciss_cam_sim));
  	cam_sim_free(sc->ciss_cam_sim, 0);
      }
      if (sc->ciss_cam_devq)
  	cam_simq_free(sc->ciss_cam_devq);
      /* XXX what about ciss_cam_path? */
  }
  
  /************************************************************************
   * Give a command to the adapter.
   *
   * Note that this uses the simple transport layer directly.  If we
   * want to add support for other layers, we'll need a switch of some
   * sort.
   *
   * Note that the simple transport layer has no way of refusing a
   * command; we only have as many request structures as the adapter
   * supports commands, so we don't have to check (this presumes that
   * the adapter can handle commands as fast as we throw them at it).
   */
  static int
  ciss_start(struct ciss_request *cr)
  {
      struct ciss_command	*cc;	/* XXX debugging only */
      int			error;
  
      cc = CISS_FIND_COMMAND(cr);
      debug(2, "post command %d tag %d ", cr->cr_tag, cc->header.host_tag);
  
      /*
       * Map the request's data.
       */
      if ((error = ciss_map_request(cr)))
  	return(error);
  
  #if 0
      ciss_print_request(cr);
  #endif
  
      return(0);
  }
  
  /************************************************************************
   * Fetch completed request(s) from the adapter, queue them for
   * completion handling.
   *
   * Note that this uses the simple transport layer directly.  If we
   * want to add support for other layers, we'll need a switch of some
   * sort.
   *
   * Note that the simple transport mechanism does not require any
   * reentrancy protection; the OPQ read is atomic.  If there is a
   * chance of a race with something else that might move the request
   * off the busy list, then we will have to lock against that
   * (eg. timeouts, etc.)
   */
  static void
  ciss_done(struct ciss_softc *sc)
  {
      struct ciss_request	*cr;
      struct ciss_command	*cc;
      u_int32_t		tag, index;
      int			complete;
      
      debug_called(3);
  
      /*
       * Loop quickly taking requests from the adapter and moving them
       * from the busy queue to the completed queue.
       */
      complete = 0;
      for (;;) {
  
  	/* see if the OPQ contains anything */
  	if (!CISS_TL_SIMPLE_OPQ_INTERRUPT(sc))
  	    break;
  
  	tag = CISS_TL_SIMPLE_FETCH_CMD(sc);
  	if (tag == CISS_TL_SIMPLE_OPQ_EMPTY)
  	    break;
  	index = tag >> 2;
  	debug(2, "completed command %d%s", index, 
  	      (tag & CISS_HDR_HOST_TAG_ERROR) ? " with error" : "");
  	if (index >= sc->ciss_max_requests) {
  	    ciss_printf(sc, "completed invalid request %d (0x%x)\n", index, tag);
  	    continue;
  	}
  	cr = &(sc->ciss_request[index]);
  	cc = CISS_FIND_COMMAND(cr);
  	cc->header.host_tag = tag;	/* not updated by adapter */
  	if (ciss_remove_busy(cr)) {
  	    /* assume this is garbage out of the adapter */
  	    ciss_printf(sc, "completed nonbusy request %d\n", index);
  	} else {
  	    ciss_enqueue_complete(cr);
  	}
  	complete = 1;
      }
      
      /*
       * Invoke completion processing.  If we can defer this out of
       * interrupt context, that'd be good.
       */
      if (complete)
  	ciss_complete(sc);
  }
  
  /************************************************************************
   * Take an interrupt from the adapter.
   */
  static void
  ciss_intr(void *arg)
  {
      struct ciss_softc	*sc = (struct ciss_softc *)arg;
  
      /*
       * The only interrupt we recognise indicates that there are
       * entries in the outbound post queue.
       */
      ciss_done(sc);
  }
  
  /************************************************************************
   * Process completed requests.
   *
   * Requests can be completed in three fashions:
   *
   * - by invoking a callback function (cr_complete is non-null)
   * - by waking up a sleeper (cr_flags has CISS_REQ_SLEEP set)
   * - by clearing the CISS_REQ_POLL flag in interrupt/timeout context
   */
  static void
  ciss_complete(struct ciss_softc *sc)
  {
      struct ciss_request	*cr;
  
      debug_called(2);
  
      /*
       * Loop taking requests off the completed queue and performing
       * completion processing on them.
       */
      for (;;) {
  	if ((cr = ciss_dequeue_complete(sc)) == NULL)
  	    break;
  	ciss_unmap_request(cr);
  	
  	/*
  	 * If the request has a callback, invoke it.
  	 */
  	if (cr->cr_complete != NULL) {
  	    cr->cr_complete(cr);
  	    continue;
  	}
  	
  	/*
  	 * If someone is sleeping on this request, wake them up.
  	 */
  	if (cr->cr_flags & CISS_REQ_SLEEP) {
  	    cr->cr_flags &= ~CISS_REQ_SLEEP;
  	    wakeup(cr);
  	    continue;
  	}
  
  	/*
  	 * If someone is polling this request for completion, signal.
  	 */
  	if (cr->cr_flags & CISS_REQ_POLL) {
  	    cr->cr_flags &= ~CISS_REQ_POLL;
  	    continue;
  	}
  	
  	/*
  	 * Give up and throw the request back on the free queue.  This
  	 * should never happen; resources will probably be lost.
  	 */
  	ciss_printf(sc, "WARNING: completed command with no submitter\n");
  	ciss_enqueue_free(cr);
      }
  }
  
  /************************************************************************
   * Report on the completion status of a request, and pass back SCSI
   * and command status values.
   */
  static int
  ciss_report_request(struct ciss_request *cr, int *command_status, int *scsi_status)
  {
      struct ciss_command		*cc;
      struct ciss_error_info	*ce;
  
      debug_called(2);
  
      cc = CISS_FIND_COMMAND(cr);
      ce = (struct ciss_error_info *)&(cc->sg[0]);
  
      /*
       * We don't consider data under/overrun an error for the Report
       * Logical/Physical LUNs commands.
       */
      if ((cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR) &&
  	((cc->cdb.cdb[0] == CISS_OPCODE_REPORT_LOGICAL_LUNS) ||
  	 (cc->cdb.cdb[0] == CISS_OPCODE_REPORT_PHYSICAL_LUNS))) {
  	cc->header.host_tag &= ~CISS_HDR_HOST_TAG_ERROR;
  	debug(2, "ignoring irrelevant under/overrun error");
      }
      
      /*
       * Check the command's error bit, if clear, there's no status and
       * everything is OK.
       */
      if (!(cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR)) {
  	if (scsi_status != NULL)
  	    *scsi_status = SCSI_STATUS_OK;
  	if (command_status != NULL)
  	    *command_status = CISS_CMD_STATUS_SUCCESS;
  	return(0);
      } else {
  	if (command_status != NULL)
  	    *command_status = ce->command_status;
  	if (scsi_status != NULL) {
  	    if (ce->command_status == CISS_CMD_STATUS_TARGET_STATUS) {
  		*scsi_status = ce->scsi_status;
  	    } else {
  		*scsi_status = -1;
  	    }
  	}
  	if (bootverbose)
  	    ciss_printf(cr->cr_sc, "command status 0x%x (%s) scsi status 0x%x\n",
  			ce->command_status, ciss_name_command_status(ce->command_status),
  			ce->scsi_status);
  	if (ce->command_status == CISS_CMD_STATUS_INVALID_COMMAND) {
  	    ciss_printf(cr->cr_sc, "invalid command, offense size %d at %d, value 0x%x\n",
  			ce->additional_error_info.invalid_command.offense_size,
  			ce->additional_error_info.invalid_command.offense_offset,
  			ce->additional_error_info.invalid_command.offense_value);
  	}
      }
      return(1);
  }
  
  /************************************************************************
   * Issue a request and don't return until it's completed.
   *
   * Depending on adapter status, we may poll or sleep waiting for
   * completion.
   */
  static int
  ciss_synch_request(struct ciss_request *cr, int timeout)
  {
      if (cr->cr_sc->ciss_flags & CISS_FLAG_RUNNING) {
  	return(ciss_wait_request(cr, timeout));
      } else {
  	return(ciss_poll_request(cr, timeout));
      }
  }
  
  /************************************************************************
   * Issue a request and poll for completion.
   *
   * Timeout in milliseconds.
   */
  static int
  ciss_poll_request(struct ciss_request *cr, int timeout)
  {
      int		error;
      
      debug_called(2);
  
      cr->cr_flags |= CISS_REQ_POLL;
      if ((error = ciss_start(cr)) != 0)
  	return(error);
  
      do {
  	ciss_done(cr->cr_sc);
  	if (!(cr->cr_flags & CISS_REQ_POLL))
  	    return(0);
  	DELAY(1000);
      } while (timeout-- >= 0);
      return(EWOULDBLOCK);
  }
  
  /************************************************************************
   * Issue a request and sleep waiting for completion.
   *
   * Timeout in milliseconds.  Note that a spurious wakeup will reset
   * the timeout.
   */
  static int
  ciss_wait_request(struct ciss_request *cr, int timeout)
  {
      int		s, error;
  
      debug_called(2);
  
      cr->cr_flags |= CISS_REQ_SLEEP;
      if ((error = ciss_start(cr)) != 0)
  	return(error);
  
      s = splcam();
      while (cr->cr_flags & CISS_REQ_SLEEP) {
  	error = tsleep(cr, PCATCH, "cissREQ", (timeout * hz) / 1000);
  	/* 
  	 * On wakeup or interruption due to restartable activity, go
  	 * back and check to see if we're done.
  	 */
  	if ((error == 0) || (error == ERESTART)) {
  	    error = 0;
  	    continue;
  	}
  	/*
  	 * Timeout, interrupted system call, etc.
  	 */
  	break;
      }
      splx(s);
      return(error);
  }
  
  #if 0
  /************************************************************************
   * Abort a request.  Note that a potential exists here to race the
   * request being completed; the caller must deal with this.
   */
  static int
  ciss_abort_request(struct ciss_request *ar)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_message_cdb	*cmc;
      int				error;
  
      debug_called(1);
  
      /* get a request */
      if ((error = ciss_get_request(ar->cr_sc, &cr)) != 0)
  	return(error);
  
      /* build the abort command */	
      cc = CISS_FIND_COMMAND(cr);
      cc->header.address.mode.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;	/* addressing? */
      cc->header.address.physical.target = 0;
      cc->header.address.physical.bus = 0;
      cc->cdb.cdb_length = sizeof(*cmc);
      cc->cdb.type = CISS_CDB_TYPE_MESSAGE;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_NONE;
      cc->cdb.timeout = 30;
  
      cmc = (struct ciss_message_cdb *)&(cc->cdb.cdb[0]);
      cmc->opcode = CISS_OPCODE_MESSAGE_ABORT;
      cmc->type = CISS_MESSAGE_ABORT_TASK;
      cmc->abort_tag = ar->cr_tag;	/* endianness?? */
  
      /*
       * Send the request and wait for a response.  If we believe we
       * aborted the request OK, clear the flag that indicates it's
       * running.
       */
      error = ciss_synch_request(cr, 35 * 1000);
      if (!error)
  	error = ciss_report_request(cr, NULL, NULL);
      ciss_release_request(cr);
  
      return(error);
  }
  #endif
  
  
  /************************************************************************
   * Fetch and initialise a request
   */
  static int
  ciss_get_request(struct ciss_softc *sc, struct ciss_request **crp)
  {
      struct ciss_request *cr;
  
      debug_called(2);
  
      /*
       * Get a request and clean it up.
       */
      if ((cr = ciss_dequeue_free(sc)) == NULL)
  	return(ENOMEM);
  
      cr->cr_data = NULL;
      cr->cr_flags = 0;
      cr->cr_complete = NULL;
      cr->cr_private = NULL;
      
      ciss_preen_command(cr);
      *crp = cr;
      return(0);
  }
  
  static void
  ciss_preen_command(struct ciss_request *cr)
  {
      struct ciss_command	*cc;
      u_int32_t		cmdphys;
  
      /*
       * Clean up the command structure.
       *
       * Note that we set up the error_info structure here, since the
       * length can be overwritten by any command.
       */
      cc = CISS_FIND_COMMAND(cr);
      cc->header.sg_in_list = 0;		/* kinda inefficient this way */
      cc->header.sg_total = 0;
      cc->header.host_tag = cr->cr_tag << 2;
      cc->header.host_tag_zeroes = 0;
      cmdphys = CISS_FIND_COMMANDPHYS(cr);
      cc->error_info.error_info_address = cmdphys + sizeof(struct ciss_command);
      cc->error_info.error_info_length = CISS_COMMAND_ALLOC_SIZE - sizeof(struct ciss_command);
      
  }
  
  /************************************************************************
   * Release a request to the free list.
   */
  static void
  ciss_release_request(struct ciss_request *cr)
  {
      struct ciss_softc	*sc;
  
      debug_called(2);
  
      sc = cr->cr_sc;
      
      /* release the request to the free queue */
      ciss_requeue_free(cr);
  }
  
  /************************************************************************
   * Allocate a request that will be used to send a BMIC command.  Do some
   * of the common setup here to avoid duplicating it everywhere else.
   */
  static int
  ciss_get_bmic_request(struct ciss_softc *sc, struct ciss_request **crp,
  		      int opcode, void **bufp, size_t bufsize)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_bmic_cdb	*cbc;
      void			*buf;
      int				error;
      int				dataout;
  
      debug_called(2);
  
      cr = NULL;
      buf = NULL;	
  
      /*
       * Get a request.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0)
  	goto out;
  
      /*
       * Allocate data storage if requested, determine the data direction.
       */
      dataout = 0;
      if ((bufsize > 0) && (bufp != NULL)) {
  	if (*bufp == NULL) {
  	    if ((buf = malloc(bufsize, CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
  		error = ENOMEM;
  		goto out;
  	    }
  	} else {
  	    buf = *bufp;
  	    dataout = 1;	/* we are given a buffer, so we are writing */
  	}
      }
  
      /*
       * Build a CISS BMIC command to get the logical drive ID.
       */
      cr->cr_data = buf;
      cr->cr_length = bufsize;
      if (!dataout)
  	cr->cr_flags = CISS_REQ_DATAIN;
      
      cc = CISS_FIND_COMMAND(cr);
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*cbc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = dataout ? CISS_CDB_DIRECTION_WRITE : CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;
  
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      bzero(cbc, sizeof(*cbc));
      cbc->opcode = dataout ? CISS_ARRAY_CONTROLLER_WRITE : CISS_ARRAY_CONTROLLER_READ;
      cbc->bmic_opcode = opcode;
      cbc->size = htons((u_int16_t)bufsize);
  
  out:
      if (error) {
  	if (cr != NULL)
  	    ciss_release_request(cr);
  	if ((bufp != NULL) && (*bufp == NULL) && (buf != NULL))
  	    free(buf, CISS_MALLOC_CLASS);
      } else {
  	*crp = cr;
  	if ((bufp != NULL) && (*bufp == NULL) && (buf != NULL))
  	    *bufp = buf;
      }
      return(error);
  }
  
  /************************************************************************
   * Handle a command passed in from userspace.
   */
  static int
  ciss_user_command(struct ciss_softc *sc, IOCTL_Command_struct *ioc)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_error_info	*ce;
      int				error = 0;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Get a request.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0)
  	goto out;
      cc = CISS_FIND_COMMAND(cr);
  
      /*
       * Allocate an in-kernel databuffer if required, copy in user data.
       */
      cr->cr_length = ioc->buf_size;
      if (ioc->buf_size > 0) {
  	if ((cr->cr_data = malloc(ioc->buf_size, CISS_MALLOC_CLASS, M_WAITOK)) == NULL) {
  	    error = ENOMEM;
  	    goto out;
  	}
  	if ((error = copyin(ioc->buf, cr->cr_data, ioc->buf_size))) {
  	    debug(0, "copyin: bad data buffer %p/%d", ioc->buf, ioc->buf_size);
  	    goto out;
  	}
      }
  
      /*
       * Build the request based on the user command.
       */
      bcopy(&ioc->LUN_info, &cc->header.address, sizeof(cc->header.address));
      bcopy(&ioc->Request, &cc->cdb, sizeof(cc->cdb));
  
      /* XXX anything else to populate here? */
  
      /*
       * Run the command.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000))) {
  	debug(0, "request failed - %d", error);
  	goto out;
      }
  
      /*
       * Check to see if the command succeeded.
       */
      ce = (struct ciss_error_info *)&(cc->sg[0]);
      if (ciss_report_request(cr, NULL, NULL) == 0)
  	bzero(ce, sizeof(*ce));
      else
  	error = EIO;
  
      /*
       * Copy the results back to the user.
       */
      bcopy(ce, &ioc->error_info, sizeof(*ce));
      if ((ioc->buf_size > 0) &&
  	(error = copyout(cr->cr_data, ioc->buf, ioc->buf_size))) {
  	debug(0, "copyout: bad data buffer %p/%d", ioc->buf, ioc->buf_size);
  	goto out;
      }
  
      /* done OK */
      error = 0;
  
  out:
      if ((cr != NULL) && (cr->cr_data != NULL))
  	free(cr->cr_data, CISS_MALLOC_CLASS);
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Map a request into bus-visible space, initialise the scatter/gather
   * list.
   */
  static int
  ciss_map_request(struct ciss_request *cr)
  {
      struct ciss_softc	*sc;
      int			error = 0;
  
      debug_called(2);
      
      sc = cr->cr_sc;
  
      /* check that mapping is necessary */
      if (cr->cr_flags & CISS_REQ_MAPPED)
  	return(0);
  
      cr->cr_flags |= CISS_REQ_MAPPED;
  
      bus_dmamap_sync(sc->ciss_command_dmat, sc->ciss_command_map,
  		    BUS_DMASYNC_PREWRITE);
  
      if (cr->cr_data != NULL) {
  	error = bus_dmamap_load(sc->ciss_buffer_dmat, cr->cr_datamap,
  				cr->cr_data, cr->cr_length,
  				ciss_request_map_helper, cr, 0);
  	if (error != 0)
  	    return (error);
      } else {
  	/*
  	 * Post the command to the adapter.
  	 */
  	ciss_enqueue_busy(cr);
  	CISS_TL_SIMPLE_POST_CMD(cr->cr_sc, CISS_FIND_COMMANDPHYS(cr));
      }
  	
      return(0);
  }
  
  static void
  ciss_request_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  {
      struct ciss_command	*cc;
      struct ciss_request *cr;
      struct ciss_softc	*sc;
      int			i;
  
      debug_called(2);
      
      cr = (struct ciss_request *)arg;
      sc = cr->cr_sc;
      cc = CISS_FIND_COMMAND(cr);
  
      for (i = 0; i < nseg; i++) {
  	cc->sg[i].address = segs[i].ds_addr;
  	cc->sg[i].length = segs[i].ds_len;
  	cc->sg[i].extension = 0;
      }
      /* we leave the s/g table entirely within the command */
      cc->header.sg_in_list = nseg;
      cc->header.sg_total = nseg;
  
      if (cr->cr_flags & CISS_REQ_DATAIN)
  	bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_PREREAD);
      if (cr->cr_flags & CISS_REQ_DATAOUT)
  	bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_PREWRITE);
  
      /*
       * Post the command to the adapter.
       */
      ciss_enqueue_busy(cr);
      CISS_TL_SIMPLE_POST_CMD(cr->cr_sc, CISS_FIND_COMMANDPHYS(cr));
  }
  
  /************************************************************************
   * Unmap a request from bus-visible space.
   */
  static void
  ciss_unmap_request(struct ciss_request *cr)
  {
      struct ciss_softc	*sc;
  
      debug_called(2);
      
      sc = cr->cr_sc;
  
      /* check that unmapping is necessary */
      if ((cr->cr_flags & CISS_REQ_MAPPED) == 0)
  	return;
      
      bus_dmamap_sync(sc->ciss_command_dmat, sc->ciss_command_map,
  		    BUS_DMASYNC_POSTWRITE);
  
      if (cr->cr_data == NULL)
  	goto out;
  
      if (cr->cr_flags & CISS_REQ_DATAIN)
  	bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_POSTREAD);
      if (cr->cr_flags & CISS_REQ_DATAOUT)
  	bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_POSTWRITE);
  
      bus_dmamap_unload(sc->ciss_buffer_dmat, cr->cr_datamap);
  out:
      cr->cr_flags &= ~CISS_REQ_MAPPED;
  }
  
  /************************************************************************
   * Attach the driver to CAM.
   *
   * We put all the logical drives on a single SCSI bus.
   */
  static int
  ciss_cam_init(struct ciss_softc *sc)
  {
  
      debug_called(1);
  
      /*
       * Allocate a devq.  We can reuse this for the masked physical
       * devices if we decide to export these as well.
       */
      if ((sc->ciss_cam_devq = cam_simq_alloc(sc->ciss_max_requests)) == NULL) {
  	ciss_printf(sc, "can't allocate CAM SIM queue\n");
  	return(ENOMEM);
      }
  
      /*
       * Create a SIM.
       */
      if ((sc->ciss_cam_sim = cam_sim_alloc(ciss_cam_action, ciss_cam_poll, "ciss", sc,
  					  device_get_unit(sc->ciss_dev),
  					  sc->ciss_max_requests - 2,
  					  1,
  					  sc->ciss_cam_devq)) == NULL) {
  	ciss_printf(sc, "can't allocate CAM SIM\n");
  	return(ENOMEM);
      }
  
      /*
       * Register bus 0 (the 'logical drives' bus) with this SIM.
       */
      if (xpt_bus_register(sc->ciss_cam_sim, 0) != 0) {
  	ciss_printf(sc, "can't register SCSI bus 0\n");
  	return(ENXIO);
      }
  
      /*
       * Initiate a rescan of the bus.
       */
      ciss_cam_rescan_all(sc);
      
      return(0);
  }
  
  /************************************************************************
   * Initiate a rescan of the 'logical devices' SIM
   */ 
  static void
  ciss_cam_rescan_target(struct ciss_softc *sc, int target)
  {
      union ccb	*ccb;
  
      debug_called(1);
  
      if ((ccb = malloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO)) == NULL) {
  	ciss_printf(sc, "rescan failed (can't allocate CCB)\n");
  	return;
      }
      
      if (xpt_create_path(&sc->ciss_cam_path, xpt_periph, cam_sim_path(sc->ciss_cam_sim), target, 0)
  	!= CAM_REQ_CMP) {
  	ciss_printf(sc, "rescan failed (can't create path)\n");
  	return;
      }
      
      xpt_setup_ccb(&ccb->ccb_h, sc->ciss_cam_path, 5/*priority (low)*/);
      ccb->ccb_h.func_code = XPT_SCAN_BUS;
      ccb->ccb_h.cbfcnp = ciss_cam_rescan_callback;
      ccb->crcn.flags = CAM_FLAG_NONE;
      xpt_action(ccb);
   
      /* scan is now in progress */
  }
  
  static void
  ciss_cam_rescan_all(struct ciss_softc *sc)
  {
      ciss_cam_rescan_target(sc, 0);
  }
  
  static void
  ciss_cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
  {
      xpt_free_path(ccb->ccb_h.path);
      free(ccb, M_TEMP);
  }
  
  /************************************************************************
   * Handle requests coming from CAM
   */
  static void
  ciss_cam_action(struct cam_sim *sim, union ccb *ccb)
  {
      struct ciss_softc	*sc;
      struct ccb_scsiio	*csio;
      int			target;
  
      sc = cam_sim_softc(sim);
      csio = (struct ccb_scsiio *)&ccb->csio;
      target = csio->ccb_h.target_id;
  
      switch (ccb->ccb_h.func_code) {
  
  	/* perform SCSI I/O */
      case XPT_SCSI_IO:
  	if (!ciss_cam_action_io(sim, csio))
  	    return;
  	break;
  
  	/* perform geometry calculations */
      case XPT_CALC_GEOMETRY:
      {
  	struct ccb_calc_geometry	*ccg = &ccb->ccg;
  	struct ciss_ldrive		*ld = &sc->ciss_logical[target];
  
  	debug(1, "XPT_CALC_GEOMETRY %d:%d:%d", cam_sim_bus(sim), ccb->ccb_h.target_id, ccb->ccb_h.target_lun);
  
  	/*
  	 * Use the cached geometry settings unless the fault tolerance
  	 * is invalid.
  	 */
  	if (ld->cl_geometry.fault_tolerance == 0xFF) {
  	    u_int32_t			secs_per_cylinder;
  
  	    ccg->heads = 255;
  	    ccg->secs_per_track = 32;
  	    secs_per_cylinder = ccg->heads * ccg->secs_per_track;
  	    ccg->cylinders = ccg->volume_size / secs_per_cylinder;
  	} else {
  	    ccg->heads = ld->cl_geometry.heads;
  	    ccg->secs_per_track = ld->cl_geometry.sectors;
  	    ccg->cylinders = ntohs(ld->cl_geometry.cylinders);
  	}
  	ccb->ccb_h.status = CAM_REQ_CMP;
          break;
      }
  
  	/* handle path attribute inquiry */
      case XPT_PATH_INQ:
      {
  	struct ccb_pathinq	*cpi = &ccb->cpi;
  
  	debug(1, "XPT_PATH_INQ %d:%d:%d", cam_sim_bus(sim), ccb->ccb_h.target_id, ccb->ccb_h.target_lun);
  
  	cpi->version_num = 1;
  	cpi->hba_inquiry = PI_TAG_ABLE;	/* XXX is this correct? */
  	cpi->target_sprt = 0;
  	cpi->hba_misc = 0;
  	cpi->max_target = CISS_MAX_LOGICAL;
  	cpi->max_lun = 0;		/* 'logical drive' channel only */
  	cpi->initiator_id = CISS_MAX_LOGICAL;
  	strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
          strncpy(cpi->hba_vid, "msmith@freebsd.org", HBA_IDLEN);
          strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
          cpi->unit_number = cam_sim_unit(sim);
          cpi->bus_id = cam_sim_bus(sim);
  	cpi->base_transfer_speed = 132 * 1024;	/* XXX what to set this to? */
  	ccb->ccb_h.status = CAM_REQ_CMP;
  	break;
      }
  
      case XPT_GET_TRAN_SETTINGS:
      {
  	struct ccb_trans_settings	*cts = &ccb->cts;
  	int				bus, target;
  
  	bus = cam_sim_bus(sim);
  	target = cts->ccb_h.target_id;
  
  	debug(1, "XPT_GET_TRAN_SETTINGS %d:%d", bus, target);
  	cts->valid = 0;
  
  	/* disconnect always OK */
  	cts->flags |= CCB_TRANS_DISC_ENB;
  	cts->valid |= CCB_TRANS_DISC_VALID;
  
  	cts->ccb_h.status = CAM_REQ_CMP;
  	break;
      }
  
      default:		/* we can't do this */
  	debug(1, "unspported func_code = 0x%x", ccb->ccb_h.func_code);
  	ccb->ccb_h.status = CAM_REQ_INVALID;
  	break;
      }
  
      xpt_done(ccb);
  }
  
  /************************************************************************
   * Handle a CAM SCSI I/O request.
   */
  static int
  ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
  {
      struct ciss_softc	*sc;
      int			bus, target;
      struct ciss_request	*cr;
      struct ciss_command	*cc;
      int			error;
  
      sc = cam_sim_softc(sim);
      bus = cam_sim_bus(sim);
      target = csio->ccb_h.target_id;
  
      debug(2, "XPT_SCSI_IO %d:%d:%d", bus, target, csio->ccb_h.target_lun);
  
      /* check for I/O attempt to nonexistent device */
      if ((bus != 0) ||
  	(target >= CISS_MAX_LOGICAL)) {
  	debug(3, "  device does not exist");
  	csio->ccb_h.status = CAM_REQ_CMP_ERR;
      }
  
      /* firmware does not support commands > 10 bytes */
      if (csio->cdb_len > 12/*CISS_CDB_BUFFER_SIZE*/) {
  	debug(3, "  command too large (%d > %d)", csio->cdb_len, CISS_CDB_BUFFER_SIZE);
  	csio->ccb_h.status = CAM_REQ_CMP_ERR;
      }
  
      /* check that the CDB pointer is not to a physical address */
      if ((csio->ccb_h.flags & CAM_CDB_POINTER) && (csio->ccb_h.flags & CAM_CDB_PHYS)) {
  	debug(3, "  CDB pointer is to physical address");
  	csio->ccb_h.status = CAM_REQ_CMP_ERR;
      }
  
      /* if there is data transfer, it must be to/from a virtual address */
      if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
  	if (csio->ccb_h.flags & CAM_DATA_PHYS) {		/* we can't map it */
  	    debug(3, "  data pointer is to physical address");
  	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
  	}
  	if (csio->ccb_h.flags & CAM_SCATTER_VALID) {	/* we want to do the s/g setup */
  	    debug(3, "  data has premature s/g setup");
  	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
  	}
      }
  
      /* abandon aborted ccbs or those that have failed validation */
      if ((csio->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
  	debug(3, "abandoning CCB due to abort/validation failure");
  	return(EINVAL);
      }
  
      /* handle emulation of some SCSI commands ourself */
      if (ciss_cam_emulate(sc, csio))
  	return(0);
  
      /*
       * Get a request to manage this command.  If we can't, return the
       * ccb, freeze the queue and flag so that we unfreeze it when a
       * request completes.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0) {
  	xpt_freeze_simq(sc->ciss_cam_sim, 1);
  	csio->ccb_h.status |= CAM_REQUEUE_REQ;
  	return(error);
      }
  
      /*
       * Build the command.
       */
      cc = CISS_FIND_COMMAND(cr);
      cr->cr_data = csio->data_ptr;
      cr->cr_length = csio->dxfer_len;
      cr->cr_complete = ciss_cam_complete;
      cr->cr_private = csio;
  	
      cc->header.address.logical.mode = CISS_HDR_ADDRESS_MODE_LOGICAL;
      cc->header.address.logical.lun = target;
      cc->cdb.cdb_length = csio->cdb_len;
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;	/* XXX ordered tags? */
      if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
  	cr->cr_flags = CISS_REQ_DATAOUT;
  	cc->cdb.direction = CISS_CDB_DIRECTION_WRITE;
      } else if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
  	cr->cr_flags = CISS_REQ_DATAIN;
  	cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      } else {
  	cr->cr_flags = 0;
  	cc->cdb.direction = CISS_CDB_DIRECTION_NONE;
      }
      cc->cdb.timeout = (csio->ccb_h.timeout / 1000) + 1;
      if (csio->ccb_h.flags & CAM_CDB_POINTER) {
  	bcopy(csio->cdb_io.cdb_ptr, &cc->cdb.cdb[0], csio->cdb_len);
      } else {
  	bcopy(csio->cdb_io.cdb_bytes, &cc->cdb.cdb[0], csio->cdb_len);
      }
  
      /*
       * Submit the request to the adapter.
       *
       * Note that this may fail if we're unable to map the request (and
       * if we ever learn a transport layer other than simple, may fail
       * if the adapter rejects the command).
       */
      if ((error = ciss_start(cr)) != 0) {
  	xpt_freeze_simq(sc->ciss_cam_sim, 1);
  	if (error == EINPROGRESS) {
  	    csio->ccb_h.status |= CAM_RELEASE_SIMQ;
  	    error = 0;
  	} else {
  	    csio->ccb_h.status |= CAM_REQUEUE_REQ;
  	    ciss_release_request(cr);
  	}
  	return(error);
      }
  	
      return(0);
  }
  
  /************************************************************************
   * Emulate SCSI commands the adapter doesn't handle as we might like.
   */
  static int
  ciss_cam_emulate(struct ciss_softc *sc, struct ccb_scsiio *csio)
  {
      int		target;
      u_int8_t	opcode;
      
      
      target = csio->ccb_h.target_id;
      opcode = (csio->ccb_h.flags & CAM_CDB_POINTER) ? 
  	*(u_int8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes[0];
  
      /*
       * Handle requests for volumes that don't exist.  A selection timeout
       * is slightly better than an illegal request.  Other errors might be 
       * better.
       */
      if (sc->ciss_logical[target].cl_status == CISS_LD_NONEXISTENT) {
  	csio->ccb_h.status = CAM_SEL_TIMEOUT;
  	xpt_done((union ccb *)csio);
  	return(1);
      }
  
      /*
       * Handle requests for volumes that exist but are offline.
       *
       * I/O operations should fail, everything else should work.
       */
      if (sc->ciss_logical[target].cl_status == CISS_LD_OFFLINE) {
  	switch(opcode) {
  	case READ_6:
  	case READ_10:
  	case READ_12:
  	case WRITE_6:
  	case WRITE_10:
  	case WRITE_12:
  	    csio->ccb_h.status = CAM_SEL_TIMEOUT;
  	    xpt_done((union ccb *)csio);
  	    return(1);
  	}
      }
  	    
  
      /* if we have to fake Synchronise Cache */
      if (sc->ciss_flags & CISS_FLAG_FAKE_SYNCH) {
  	
  	/*
  	 * If this is a Synchronise Cache command, typically issued when
  	 * a device is closed, flush the adapter and complete now.
  	 */
  	if (((csio->ccb_h.flags & CAM_CDB_POINTER) ? 
  	     *(u_int8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes[0]) == SYNCHRONIZE_CACHE) {
  	    ciss_flush_adapter(sc);
  	    csio->ccb_h.status = CAM_REQ_CMP;
  	    xpt_done((union ccb *)csio);
  	    return(1);
  	}
      }
  
      return(0);
  }
  
  /************************************************************************
   * Check for possibly-completed commands.
   */
  static void
  ciss_cam_poll(struct cam_sim *sim)
  {
      struct ciss_softc	*sc = cam_sim_softc(sim);
  
      debug_called(2);
  
      ciss_done(sc);
  }
  
  /************************************************************************
   * Handle completion of a command - pass results back through the CCB
   */
  static void
  ciss_cam_complete(struct ciss_request *cr)
  {
      struct ciss_softc		*sc;
      struct ciss_command		*cc;
      struct ciss_error_info	*ce;
      struct ccb_scsiio		*csio;
      int				scsi_status;
      int				command_status;
  
      debug_called(2);
  
      sc = cr->cr_sc;
      cc = CISS_FIND_COMMAND(cr);
      ce = (struct ciss_error_info *)&(cc->sg[0]);
      csio = (struct ccb_scsiio *)cr->cr_private;
  
      /*
       * Extract status values from request.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
      csio->scsi_status = scsi_status;
      
      /*
       * Handle specific SCSI status values.
       */
      switch(scsi_status) {
  	/* no status due to adapter error */
      case -1:				
  	debug(0, "adapter error");
  	csio->ccb_h.status = CAM_REQ_CMP_ERR;
  	break;
  	
  	/* no status due to command completed OK */
      case SCSI_STATUS_OK:		/* CISS_SCSI_STATUS_GOOD */
  	debug(2, "SCSI_STATUS_OK");
  	csio->ccb_h.status = CAM_REQ_CMP;
  	break;
  
  	/* check condition, sense data included */
      case SCSI_STATUS_CHECK_COND:	/* CISS_SCSI_STATUS_CHECK_CONDITION */
  	debug(0, "SCSI_STATUS_CHECK_COND  sense size %d  resid %d",
  	      ce->sense_length, ce->residual_count);
  	bzero(&csio->sense_data, SSD_FULL_SIZE);
  	bcopy(&ce->sense_info[0], &csio->sense_data, ce->sense_length);
  	csio->sense_len = ce->sense_length;
  	csio->resid = ce->residual_count;	
  	csio->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
  #ifdef CISS_DEBUG
  	{
  	    struct scsi_sense_data	*sns = (struct scsi_sense_data *)&ce->sense_info[0];
  	    debug(0, "sense key %x", sns->flags & SSD_KEY);
  	}
  #endif	    
  	break;
  
      case SCSI_STATUS_BUSY:		/* CISS_SCSI_STATUS_BUSY */
  	debug(0, "SCSI_STATUS_BUSY");
  	csio->ccb_h.status = CAM_SCSI_BUSY;
  	break;
  
      default:
  	debug(0, "unknown status 0x%x", csio->scsi_status);
  	csio->ccb_h.status = CAM_REQ_CMP_ERR;
  	break;
      }
  
      /* handle post-command fixup */
      ciss_cam_complete_fixup(sc, csio);
  
      /* tell CAM we're ready for more commands */
      csio->ccb_h.status |= CAM_RELEASE_SIMQ;
  
      xpt_done((union ccb *)csio);
      ciss_release_request(cr);
  }
  
  /********************************************************************************
   * Fix up the result of some commands here.
   */
  static void
  ciss_cam_complete_fixup(struct ciss_softc *sc, struct ccb_scsiio *csio)
  {
      struct scsi_inquiry_data	*inq;
      struct ciss_ldrive		*cl;
      int				target;
  
      if (((csio->ccb_h.flags & CAM_CDB_POINTER) ? 
  	 *(u_int8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes[0]) == INQUIRY) {
  
  	inq = (struct scsi_inquiry_data *)csio->data_ptr;
  	target = csio->ccb_h.target_id;
  	cl = &sc->ciss_logical[target];
  	
  	padstr(inq->vendor, "COMPAQ", 8);
  	padstr(inq->product, ciss_name_ldrive_org(cl->cl_ldrive->fault_tolerance), 8);
  	padstr(inq->revision, ciss_name_ldrive_status(cl->cl_lstatus->status), 16);
      }
  }
  
  
  /********************************************************************************
   * Find a peripheral attached at (target)
   */
  static struct cam_periph *
  ciss_find_periph(struct ciss_softc *sc, int target)
  {
      struct cam_periph	*periph;
      struct cam_path	*path;
      int			status;
  
      status = xpt_create_path(&path, NULL, cam_sim_path(sc->ciss_cam_sim), target, 0);
      if (status == CAM_REQ_CMP) {
  	periph = cam_periph_find(path, NULL);
  	xpt_free_path(path);
      } else {
  	periph = NULL;
      }
      return(periph);
  }
  
  /********************************************************************************
   * Name the device at (target)
   *
   * XXX is this strictly correct?
   */
  static int
  ciss_name_device(struct ciss_softc *sc, int target)
  {
      struct cam_periph	*periph;
  
      if ((periph = ciss_find_periph(sc, target)) != NULL) {
  	sprintf(sc->ciss_logical[target].cl_name, "%s%d", periph->periph_name, periph->unit_number);
  	return(0);
      }
      sc->ciss_logical[target].cl_name[0] = 0;
      return(ENOENT);
  }
  
  /************************************************************************
   * Periodic status monitoring.
   */
  static void
  ciss_periodic(void *arg)
  {
      struct ciss_softc	*sc;
  
      debug_called(1);
      
      sc = (struct ciss_softc *)arg;
  
      /*
       * Check the adapter heartbeat.
       */
      if (sc->ciss_cfg->heartbeat == sc->ciss_heartbeat) {
  	sc->ciss_heart_attack++;
  	debug(0, "adapter heart attack in progress 0x%x/%d", 
  	      sc->ciss_heartbeat, sc->ciss_heart_attack);
  	if (sc->ciss_heart_attack == 3) {
  	    ciss_printf(sc, "ADAPTER HEARTBEAT FAILED\n");
  	    /* XXX should reset adapter here */
  	}
      } else {
  	sc->ciss_heartbeat = sc->ciss_cfg->heartbeat;
  	sc->ciss_heart_attack = 0;
  	debug(3, "new heartbeat 0x%x", sc->ciss_heartbeat);
      }
      
      /*
       * If the notify event request has died for some reason, or has
       * not started yet, restart it.
       */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK)) {
  	debug(0, "(re)starting Event Notify chain");
  	ciss_notify_event(sc);
      }
  
      /*
       * Reschedule.
       */
      if (!(sc->ciss_flags & CISS_FLAG_ABORTING))
  	sc->ciss_periodic = timeout(ciss_periodic, sc, CISS_HEARTBEAT_RATE * hz);
  }
  
  /************************************************************************
   * Request a notification response from the adapter.
   *
   * If (cr) is NULL, this is the first request of the adapter, so
   * reset the adapter's message pointer and start with the oldest
   * message available.
   */
  static void
  ciss_notify_event(struct ciss_softc *sc)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_notify_cdb	*cnc;
      int				error;
  
      debug_called(1);
  
      cr = sc->ciss_periodic_notify;
      
      /* get a request if we don't already have one */
      if (cr == NULL) {
  	if ((error = ciss_get_request(sc, &cr)) != 0) {
  	    debug(0, "can't get notify event request");
  	    goto out;
  	}
  	sc->ciss_periodic_notify = cr;
  	cr->cr_complete = ciss_notify_complete;
  	debug(1, "acquired request %d", cr->cr_tag);
      }
      
      /* 
       * Get a databuffer if we don't already have one, note that the
       * adapter command wants a larger buffer than the actual
       * structure.
       */
      if (cr->cr_data == NULL) {
  	if ((cr->cr_data = malloc(CISS_NOTIFY_DATA_SIZE, CISS_MALLOC_CLASS, M_NOWAIT)) == NULL) {
  	    debug(0, "can't get notify event request buffer");
  	    error = ENOMEM;
  	    goto out;
  	}
  	cr->cr_length = CISS_NOTIFY_DATA_SIZE;
      }
  
      /* re-setup the request's command (since we never release it) XXX overkill*/
      ciss_preen_command(cr);
  
      /* (re)build the notify event command */
      cc = CISS_FIND_COMMAND(cr);
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
  
      cc->cdb.cdb_length = sizeof(*cnc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;	/* no timeout, we hope */
      
      cnc = (struct ciss_notify_cdb *)&(cc->cdb.cdb[0]);
      bzero(cr->cr_data, CISS_NOTIFY_DATA_SIZE);
      cnc->opcode = CISS_OPCODE_READ;
      cnc->command = CISS_COMMAND_NOTIFY_ON_EVENT;
      cnc->timeout = 0;		/* no timeout, we hope */
      cnc->synchronous = 0;
      cnc->ordered = 0;
      cnc->seek_to_oldest = 0;
      cnc->new_only = 0;
      cnc->length = htonl(CISS_NOTIFY_DATA_SIZE);
  
      /* submit the request */
      error = ciss_start(cr);
  
   out:
      if (error) {
  	if (cr != NULL) {
  	    if (cr->cr_data != NULL)
  		free(cr->cr_data, CISS_MALLOC_CLASS);
  	    ciss_release_request(cr);
  	}
  	sc->ciss_periodic_notify = NULL;
  	debug(0, "can't submit notify event request");
  	sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
      } else {
  	debug(1, "notify event submitted");
  	sc->ciss_flags |= CISS_FLAG_NOTIFY_OK;
      }
  }
  
  static void
  ciss_notify_complete(struct ciss_request *cr)
  {
      struct ciss_command	*cc;
      struct ciss_notify	*cn;
      struct ciss_softc	*sc;
      int			scsi_status;
      int			command_status;
  
      debug_called(1);
      
      cc = CISS_FIND_COMMAND(cr);
      cn = (struct ciss_notify *)cr->cr_data;
      sc = cr->cr_sc;
      
      /*
       * Report request results, decode status.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
  
      /*
       * Abort the chain on a fatal error.
       *
       * XXX which of these are actually errors?
       */
      if ((command_status != CISS_CMD_STATUS_SUCCESS) &&
  	(command_status != CISS_CMD_STATUS_TARGET_STATUS) &&
  	(command_status != CISS_CMD_STATUS_TIMEOUT)) {	/* XXX timeout? */
  	ciss_printf(sc, "fatal error in Notify Event request (%s)\n",
  		    ciss_name_command_status(command_status));
  	ciss_release_request(cr);
  	sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
  	return;
      }
  
      /* 
       * If the adapter gave us a text message, print it.
       */
      if (cn->message[0] != 0)
  	ciss_printf(sc, "*** %.80s\n", cn->message);
  
      debug(0, "notify event class %d subclass %d detail %d",
  		cn->class, cn->subclass, cn->detail);
  
      /*
       * If there's room, save the event for a user-level tool.
       */
      if (((sc->ciss_notify_head + 1) % CISS_MAX_EVENTS) != sc->ciss_notify_tail) {
  	sc->ciss_notify[sc->ciss_notify_head] = *cn;
  	sc->ciss_notify_head = (sc->ciss_notify_head + 1) % CISS_MAX_EVENTS;
      }
  
      /*
       * Some events are directly of interest to us.
       */
      switch (cn->class) {
      case CISS_NOTIFY_LOGICAL:
  	ciss_notify_logical(sc, cn);
  	break;
      case CISS_NOTIFY_PHYSICAL:
  	ciss_notify_physical(sc, cn);
  	break;
      }
  
      /*
       * If the response indicates that the notifier has been aborted,
       * release the notifier command.
       */
      if ((cn->class == CISS_NOTIFY_NOTIFIER) &&
  	(cn->subclass == CISS_NOTIFY_NOTIFIER_STATUS) &&
  	(cn->detail == 1)) {
  	debug(0, "notifier exiting");
  	sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
  	ciss_release_request(cr);
  	sc->ciss_periodic_notify = NULL;
  	wakeup(&sc->ciss_periodic_notify);
      }
  	
      /*
       * Send a new notify event command, if we're not aborting.
       */
      if (!(sc->ciss_flags & CISS_FLAG_ABORTING)) {
  	ciss_notify_event(sc);
      }
  }
  
  /************************************************************************
   * Abort the Notify Event chain.
   *
   * Note that we can't just abort the command in progress; we have to
   * explicitly issue an Abort Notify Event command in order for the
   * adapter to clean up correctly.
   *
   * If we are called with CISS_FLAG_ABORTING set in the adapter softc,
   * the chain will not restart itself.
   */
  static int
  ciss_notify_abort(struct ciss_softc *sc)
  {
      struct ciss_request		*cr;
      struct ciss_command		*cc;
      struct ciss_notify_cdb	*cnc;
      int				error, s, command_status, scsi_status;
  
      debug_called(1);
  
      cr = NULL;
      error = 0;
      
      /* verify that there's an outstanding command */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK))
  	goto out;
      
      /* get a command to issue the abort with */
      if ((error = ciss_get_request(sc, &cr)))
  	goto out;
  
      /* get a buffer for the result */
      if ((cr->cr_data = malloc(CISS_NOTIFY_DATA_SIZE, CISS_MALLOC_CLASS, M_NOWAIT)) == NULL) {
  	debug(0, "can't get notify event request buffer");
  	error = ENOMEM;
  	goto out;
      }
      cr->cr_length = CISS_NOTIFY_DATA_SIZE;
      
      /* build the CDB */
      cc = CISS_FIND_COMMAND(cr);
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*cnc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;	/* no timeout, we hope */
      
      cnc = (struct ciss_notify_cdb *)&(cc->cdb.cdb[0]);
      bzero(cnc, sizeof(*cnc));
      cnc->opcode = CISS_OPCODE_WRITE;
      cnc->command = CISS_COMMAND_ABORT_NOTIFY;
      cnc->length = htonl(CISS_NOTIFY_DATA_SIZE);
  
      ciss_print_request(cr);
      
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "Abort Notify Event command failed (%d)\n", error);
  	goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
  	break;
      case CISS_CMD_STATUS_INVALID_COMMAND:
  	/*
  	 * Some older adapters don't support the CISS version of this
  	 * command.  Fall back to using the BMIC version.
  	 */
  	error = ciss_notify_abort_bmic(sc);
  	if (error != 0)
  	    goto out;
  	break;
  	
      case CISS_CMD_STATUS_TARGET_STATUS:
  	/*
  	 * This can happen if the adapter thinks there wasn't an outstanding
  	 * Notify Event command but we did.  We clean up here.
  	 */
  	if (scsi_status == CISS_SCSI_STATUS_CHECK_CONDITION) {
  	    if (sc->ciss_periodic_notify != NULL)
  		ciss_release_request(sc->ciss_periodic_notify);
  	    error = 0;
  	    goto out;
  	}
  	/* FALLTHROUGH */
  	    
      default:
  	ciss_printf(sc, "Abort Notify Event command failed (%s)\n",
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
      
      /*
       * Sleep waiting for the notifier command to complete.  Note
       * that if it doesn't, we may end up in a bad situation, since
       * the adapter may deliver it later.  Also note that the adapter
       * requires the Notify Event command to be cancelled in order to
       * maintain internal bookkeeping.
       */
      s = splcam();
      while (sc->ciss_periodic_notify != NULL) {
  	error = tsleep(&sc->ciss_periodic_notify, 0, "cissNEA", hz * 5);
  	if (error == EWOULDBLOCK) {
  	    ciss_printf(sc, "Notify Event command failed to abort, adapter may wedge.\n");
  	    break;
  	}
      }
      splx(s);
  
   out:
      /* release the cancel request */
      if (cr != NULL) {
  	if (cr->cr_data != NULL)
  	    free(cr->cr_data, CISS_MALLOC_CLASS);
  	ciss_release_request(cr);
      }
      if (error == 0)
  	sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
      return(error);
  }
  
  /************************************************************************
   * Abort the Notify Event chain using a BMIC command.
   */
  static int
  ciss_notify_abort_bmic(struct ciss_softc *sc)
  {
      struct ciss_request			*cr;
      int					error, command_status;
  
      debug_called(1);
  
      cr = NULL;
      error = 0;
  
      /* verify that there's an outstanding command */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK))
  	goto out;
      
      /*
       * Build a BMIC command to cancel the Notify on Event command.
       *
       * Note that we are sending a CISS opcode here.  Odd.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_COMMAND_ABORT_NOTIFY,
  				       NULL, 0)) != 0)
  	goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
  	ciss_printf(sc, "error sending BMIC Cancel Notify on Event command (%d)\n", error);
  	goto out;
      }
      
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
  	break;
      default:
  	ciss_printf(sc, "error cancelling Notify on Event (%s)\n",  
  		    ciss_name_command_status(command_status));
  	error = EIO;
  	goto out;
      }
  
  out:
      if (cr != NULL)
  	ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Handle a notify event relating to the status of a logical drive.
   *
   * XXX need to be able to defer some of these to properly handle
   *     calling the "ID Physical drive" command, unless the 'extended'
   *     drive IDs are always in BIG_MAP format.
   */
  static void
  ciss_notify_logical(struct ciss_softc *sc, struct ciss_notify *cn)
  {
      struct ciss_ldrive	*ld;
      int			ostatus;
  
      debug_called(2);
  
      ld = &sc->ciss_logical[cn->data.logical_status.logical_drive];
  
      switch (cn->subclass) {
      case CISS_NOTIFY_LOGICAL_STATUS:
  	switch (cn->detail) {
  	case 0:
  	    ciss_name_device(sc, cn->data.logical_status.logical_drive);
  	    ciss_printf(sc, "logical drive %d (%s) changed status %s->%s, spare status 0x%b\n",
  			cn->data.logical_status.logical_drive, ld->cl_name,
  			ciss_name_ldrive_status(cn->data.logical_status.previous_state),
  			ciss_name_ldrive_status(cn->data.logical_status.new_state),
  			cn->data.logical_status.spare_state,
  			"\20\1configured\2rebuilding\3failed\4in use\5available\n");
  
  	    /*
  	     * Update our idea of the drive's status.
  	     */
  	    ostatus = ciss_decode_ldrive_status(cn->data.logical_status.previous_state);
  	    ld->cl_status = ciss_decode_ldrive_status(cn->data.logical_status.new_state);
  	    if (ld->cl_lstatus != NULL)
  		ld->cl_lstatus->status = cn->data.logical_status.new_state;
  
  #if 0
  	    /*
  	     * Have CAM rescan the drive if its status has changed.
  	     */
  	    if (ostatus != ld->cl_status)
  		ciss_cam_rescan_target(sc, cn->data.logical_status.logical_drive);
  #endif
  
  	    break;
  
  	case 1:	/* logical drive has recognised new media, needs Accept Media Exchange */
  	    ciss_name_device(sc, cn->data.logical_status.logical_drive);
  	    ciss_printf(sc, "logical drive %d (%s) media exchanged, ready to go online\n",
  			cn->data.logical_status.logical_drive, ld->cl_name);
  	    ciss_accept_media(sc, cn->data.logical_status.logical_drive, 1);
  	    break;
  
  	case 2:
  	case 3:
  	    ciss_printf(sc, "rebuild of logical drive %d (%s) failed due to %s error\n",
  			cn->data.rebuild_aborted.logical_drive,
  			sc->ciss_logical[cn->data.rebuild_aborted.logical_drive].cl_name,
  			(cn->detail == 2) ? "read" : "write");
  	    break;
  	}
  	break;
  
      case CISS_NOTIFY_LOGICAL_ERROR:
  	if (cn->detail == 0) {
  	    ciss_printf(sc, "FATAL I/O ERROR on logical drive %d (%s), SCSI port %d ID %d\n",
  			cn->data.io_error.logical_drive,
  			sc->ciss_logical[cn->data.io_error.logical_drive].cl_name,
  			cn->data.io_error.failure_bus,
  			cn->data.io_error.failure_drive);
  	    /* XXX should we take the drive down at this point, or will we be told? */
  	}
  	break;
  
      case CISS_NOTIFY_LOGICAL_SURFACE:
  	if (cn->detail == 0)
  	    ciss_printf(sc, "logical drive %d (%s) completed consistency initialisation\n",
  			cn->data.consistency_completed.logical_drive,
  			sc->ciss_logical[cn->data.consistency_completed.logical_drive].cl_name);
  	break;
      }
  }
  
  /************************************************************************
   * Handle a notify event relating to the status of a physical drive.
   */
  static void
  ciss_notify_physical(struct ciss_softc *sc, struct ciss_notify *cn)
  {
      
  }
  
  /************************************************************************
   * Print a request.
   */
  static void
  ciss_print_request(struct ciss_request *cr)
  {
      struct ciss_softc	*sc;
      struct ciss_command	*cc;
      int			i;
  
      sc = cr->cr_sc;
      cc = CISS_FIND_COMMAND(cr);
      
      ciss_printf(sc, "REQUEST @ %p\n", cr);
      ciss_printf(sc, "  data %p/%d  tag %d  flags %b\n",
  	      cr->cr_data, cr->cr_length, cr->cr_tag, cr->cr_flags,
  	      "\20\1mapped\2sleep\3poll\4dataout\5datain\n");
      ciss_printf(sc, "  sg list/total %d/%d  host tag 0x%x\n",
  		cc->header.sg_in_list, cc->header.sg_total, cc->header.host_tag);
      switch(cc->header.address.mode.mode) {
      case CISS_HDR_ADDRESS_MODE_PERIPHERAL:
      case CISS_HDR_ADDRESS_MODE_MASK_PERIPHERAL:
  	ciss_printf(sc, "  physical bus %d target %d\n",
  		    cc->header.address.physical.bus, cc->header.address.physical.target);
  	break;
      case CISS_HDR_ADDRESS_MODE_LOGICAL:
  	ciss_printf(sc, "  logical unit %d\n", cc->header.address.logical.lun);
  	break;
      }
      ciss_printf(sc, "  %s cdb length %d type %s attribute %s\n", 
  		(cc->cdb.direction == CISS_CDB_DIRECTION_NONE) ? "no-I/O" :
  		(cc->cdb.direction == CISS_CDB_DIRECTION_READ) ? "READ" :
  		(cc->cdb.direction == CISS_CDB_DIRECTION_WRITE) ? "WRITE" : "??",
  		cc->cdb.cdb_length,
  		(cc->cdb.type == CISS_CDB_TYPE_COMMAND) ? "command" :
  		(cc->cdb.type == CISS_CDB_TYPE_MESSAGE) ? "message" : "??",
  		(cc->cdb.attribute == CISS_CDB_ATTRIBUTE_UNTAGGED) ? "untagged" :
  		(cc->cdb.attribute == CISS_CDB_ATTRIBUTE_SIMPLE) ? "simple" :
  		(cc->cdb.attribute == CISS_CDB_ATTRIBUTE_HEAD_OF_QUEUE) ? "head-of-queue" :
  		(cc->cdb.attribute == CISS_CDB_ATTRIBUTE_ORDERED) ? "ordered" :
  		(cc->cdb.attribute == CISS_CDB_ATTRIBUTE_AUTO_CONTINGENT) ? "auto-contingent" : "??");
      ciss_printf(sc, "  %*D\n", cc->cdb.cdb_length, &cc->cdb.cdb[0], " ");
  
      if (cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR) {
  	/* XXX print error info */
      } else {
  	/* since we don't use chained s/g, don't support it here */
  	for (i = 0; i < cc->header.sg_in_list; i++) {
  	    if ((i % 4) == 0)
  		ciss_printf(sc, "   ");
  	    printf("0x%08x/%d ", (u_int32_t)cc->sg[i].address, cc->sg[i].length);
  	    if ((((i + 1) % 4) == 0) || (i == (cc->header.sg_in_list - 1)))
  		printf("\n");
  	}
      }
  }
  
  /************************************************************************
   * Print information about the status of a logical drive.
   */
  static void
  ciss_print_ldrive(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      int		bus, target, i;
  
      if (ld->cl_lstatus == NULL) {
  	printf("does not exist\n");
  	return;
      }
  
      /* print drive status */
      switch(ld->cl_lstatus->status) {
      case CISS_LSTATUS_OK:
  	printf("online\n");
  	break;
      case CISS_LSTATUS_INTERIM_RECOVERY:
  	printf("in interim recovery mode\n");
  	break;
      case CISS_LSTATUS_READY_RECOVERY:
  	printf("ready to begin recovery\n");
  	break;
      case CISS_LSTATUS_RECOVERING:
  	bus = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_rebuilding);
  	target = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_rebuilding);
  	printf("being recovered, working on physical drive %d.%d, %u blocks remaining\n",
  	       bus, target, ld->cl_lstatus->blocks_to_recover);
  	break;
      case CISS_LSTATUS_EXPANDING:
  	printf("being expanded, %u blocks remaining\n",
  	       ld->cl_lstatus->blocks_to_recover);
  	break;
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
  	printf("queued for expansion\n");
  	break;
      case CISS_LSTATUS_FAILED:
  	printf("queued for expansion\n");
  	break;
      case CISS_LSTATUS_WRONG_PDRIVE:
  	printf("wrong physical drive inserted\n");
  	break;
      case CISS_LSTATUS_MISSING_PDRIVE:
  	printf("missing a needed physical drive\n");
  	break;
      case CISS_LSTATUS_BECOMING_READY:
  	printf("becoming ready\n");
  	break;
      }
  
      /* print failed physical drives */
      for (i = 0; i < CISS_BIG_MAP_ENTRIES / 8; i++) {
  	bus = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_failure_map[i]);
  	target = CISS_BIG_MAP_TARGET(sc, ld->cl_lstatus->drive_failure_map[i]);
  	if (bus == -1)
  	    continue;
  	ciss_printf(sc, "physical drive %d:%d (%x) failed\n", bus, target, 
  		    ld->cl_lstatus->drive_failure_map[i]);
      }
  }
  
  #ifdef CISS_DEBUG
  /************************************************************************
   * Print information about the controller/driver.
   */
  static void
  ciss_print_adapter(struct ciss_softc *sc)
  {
      int		i;
  
      ciss_printf(sc, "ADAPTER:\n");
      for (i = 0; i < CISSQ_COUNT; i++) {
  	ciss_printf(sc, "%s     %d/%d\n",
  	    i == 0 ? "free" :
  	    i == 1 ? "busy" : "complete",
  	    sc->ciss_qstat[i].q_length,
  	    sc->ciss_qstat[i].q_max);
      }
      ciss_printf(sc, "max_requests %d\n", sc->ciss_max_requests);
      ciss_printf(sc, "notify_head/tail %d/%d\n",
  	sc->ciss_notify_head, sc->ciss_notify_tail);
      ciss_printf(sc, "flags %b\n", sc->ciss_flags,
  	"\20\1notify_ok\2control_open\3aborting\4running\21fake_synch\22bmic_abort\n");
  
      for (i = 0; i < CISS_MAX_LOGICAL; i++) {
  	ciss_printf(sc, "LOGICAL DRIVE %d:  ", i);
  	ciss_print_ldrive(sc, sc->ciss_logical + i);
      }
  
      for (i = 1; i < sc->ciss_max_requests; i++)
  	ciss_print_request(sc->ciss_request + i);
  
  }
  
  /* DDB hook */
  static void
  ciss_print0(void)
  {
      struct ciss_softc	*sc;
      
      sc = devclass_get_softc(devclass_find("ciss"), 0);
      if (sc == NULL) {
  	printf("no ciss controllers\n");
      } else {
  	ciss_print_adapter(sc);
      }
  }
  #endif
  
  /************************************************************************
   * Return a name for a logical drive status value.
   */
  static const char *
  ciss_name_ldrive_status(int status)
  {
      switch (status) {
      case CISS_LSTATUS_OK:
  	return("OK");
      case CISS_LSTATUS_FAILED:
  	return("failed");
      case CISS_LSTATUS_NOT_CONFIGURED:
  	return("not configured");
      case CISS_LSTATUS_INTERIM_RECOVERY:
  	return("interim recovery");
      case CISS_LSTATUS_READY_RECOVERY:
  	return("ready for recovery");
      case CISS_LSTATUS_RECOVERING:
  	return("recovering");
      case CISS_LSTATUS_WRONG_PDRIVE:
  	return("wrong physical drive inserted");
      case CISS_LSTATUS_MISSING_PDRIVE:
  	return("missing physical drive");
      case CISS_LSTATUS_EXPANDING:
  	return("expanding");
      case CISS_LSTATUS_BECOMING_READY:
  	return("becoming ready");
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
  	return("queued for expansion");
      }
      return("unknown status");
  }
  
  /************************************************************************
   * Return an online/offline/nonexistent value for a logical drive
   * status value.
   */
  static int
  ciss_decode_ldrive_status(int status)
  {
      switch(status) {
      case CISS_LSTATUS_NOT_CONFIGURED:
  	return(CISS_LD_NONEXISTENT);
  
      case CISS_LSTATUS_OK:
      case CISS_LSTATUS_INTERIM_RECOVERY:
      case CISS_LSTATUS_READY_RECOVERY:
      case CISS_LSTATUS_RECOVERING:
      case CISS_LSTATUS_EXPANDING:
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
  	return(CISS_LD_ONLINE);
  
      case CISS_LSTATUS_FAILED:
      case CISS_LSTATUS_WRONG_PDRIVE:
      case CISS_LSTATUS_MISSING_PDRIVE:
      case CISS_LSTATUS_BECOMING_READY:
      default:
  	return(CISS_LD_OFFLINE);
      }
  }
  
  
  /************************************************************************
   * Return a name for a logical drive's organisation.
   */
  static const char *
  ciss_name_ldrive_org(int org)
  {
      switch(org) {
      case CISS_LDRIVE_RAID0:
  	return("RAID 0");
      case CISS_LDRIVE_RAID1:
  	return("RAID 1");
      case CISS_LDRIVE_RAID4:
  	return("RAID 4");
      case CISS_LDRIVE_RAID5:
  	return("RAID 5");
      }
      return("unkown");
  }
  
  /************************************************************************
   * Return a name for a command status value.
   */
  static const char *
  ciss_name_command_status(int status)
  {
      switch(status) {
      case CISS_CMD_STATUS_SUCCESS:
  	return("success");
      case CISS_CMD_STATUS_TARGET_STATUS:
  	return("target status");
      case CISS_CMD_STATUS_DATA_UNDERRUN:
  	return("data underrun");
      case CISS_CMD_STATUS_DATA_OVERRUN:
  	return("data overrun");
      case CISS_CMD_STATUS_INVALID_COMMAND:
  	return("invalid command");
      case CISS_CMD_STATUS_PROTOCOL_ERROR:
  	return("protocol error");
      case CISS_CMD_STATUS_HARDWARE_ERROR:
  	return("hardware error");
      case CISS_CMD_STATUS_CONNECTION_LOST:
  	return("connection lost");
      case CISS_CMD_STATUS_ABORTED:
  	return("aborted");
      case CISS_CMD_STATUS_ABORT_FAILED:
  	return("abort failed");
      case CISS_CMD_STATUS_UNSOLICITED_ABORT:
  	return("unsolicited abort");
      case CISS_CMD_STATUS_TIMEOUT:
  	return("timeout");
      case CISS_CMD_STATUS_UNABORTABLE:
  	return("unabortable");
      }
      return("unknown status");
  }
  
  /************************************************************************
   * Handle an open on the control device.
   */
  static int
  ciss_open(dev_t dev, int flags, int fmt, d_thread_t *p)
  {
      struct ciss_softc	*sc;
  
      debug_called(1);
      
      sc = (struct ciss_softc *)dev->si_drv1;
  
      /* we might want to veto if someone already has us open */
  	
      sc->ciss_flags |= CISS_FLAG_CONTROL_OPEN;
      return(0);
  }
  
  /************************************************************************
   * Handle the last close on the control device.
   */
  static int
  ciss_close(dev_t dev, int flags, int fmt, d_thread_t *p)
  {
      struct ciss_softc	*sc;
  
      debug_called(1);
      
      sc = (struct ciss_softc *)dev->si_drv1;
      
      sc->ciss_flags &= ~CISS_FLAG_CONTROL_OPEN;
      return (0);
  }
  
  /********************************************************************************
   * Handle adapter-specific control operations.
   *
   * Note that the API here is compatible with the Linux driver, in order to
   * simplify the porting of Compaq's userland tools.
   */
  static int
  ciss_ioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, d_thread_t *p)
  {
      struct ciss_softc		*sc;
      int				error;
  
      debug_called(1);
  
      sc = (struct ciss_softc *)dev->si_drv1;
      error = 0;
  
      switch(cmd) {
      case CCISS_GETPCIINFO:
      {
  	cciss_pci_info_struct	*pis = (cciss_pci_info_struct *)addr;
  
  	pis->bus = pci_get_bus(sc->ciss_dev);
  	pis->dev_fn = pci_get_slot(sc->ciss_dev);
  	pis->board_id = pci_get_devid(sc->ciss_dev);
  
  	break;
      }
      
      case CCISS_GETINTINFO:
      {
  	cciss_coalint_struct	*cis = (cciss_coalint_struct *)addr;
  
  	cis->delay = sc->ciss_cfg->interrupt_coalesce_delay;
  	cis->count = sc->ciss_cfg->interrupt_coalesce_count;
  
  	break;
      }
  
      case CCISS_SETINTINFO:
      {
  	cciss_coalint_struct	*cis = (cciss_coalint_struct *)addr;
  
  	if ((cis->delay == 0) && (cis->count == 0)) {
  	    error = EINVAL;
  	    break;
  	}
  
  	/*
  	 * XXX apparently this is only safe if the controller is idle,
  	 *     we should suspend it before doing this.
  	 */
  	sc->ciss_cfg->interrupt_coalesce_delay = cis->delay;
  	sc->ciss_cfg->interrupt_coalesce_count = cis->count;
  
  	if (ciss_update_config(sc))
  	    error = EIO;
  
  	/* XXX resume the controller here */
  	break;
      }
  
      case CCISS_GETNODENAME:
  	bcopy(sc->ciss_cfg->server_name, (NodeName_type *)addr,
  	      sizeof(NodeName_type));
  	break;
  
      case CCISS_SETNODENAME:
  	bcopy((NodeName_type *)addr, sc->ciss_cfg->server_name,
  	      sizeof(NodeName_type));
  	if (ciss_update_config(sc))
  	    error = EIO;
  	break;
  	
      case CCISS_GETHEARTBEAT:
  	*(Heartbeat_type *)addr = sc->ciss_cfg->heartbeat;
  	break;
  
      case CCISS_GETBUSTYPES:
  	*(BusTypes_type *)addr = sc->ciss_cfg->bus_types;
  	break;
  
      case CCISS_GETFIRMVER:
  	bcopy(sc->ciss_id->running_firmware_revision, (FirmwareVer_type *)addr,
  	      sizeof(FirmwareVer_type));
  	break;
  
      case CCISS_GETDRIVERVER:
  	*(DriverVer_type *)addr = CISS_DRIVER_VERSION;
  	break;
  
      case CCISS_REVALIDVOLS:
  	/*
  	 * This is a bit ugly; to do it "right" we really need
  	 * to find any disks that have changed, kick CAM off them,
  	 * then rescan only these disks.  It'd be nice if they
  	 * a) told us which disk(s) they were going to play with,
  	 * and b) which ones had arrived. 8(
  	 */
  	break;
  
      case CCISS_PASSTHRU:
  	error = ciss_user_command(sc, (IOCTL_Command_struct *)addr);
  	break;
  
      default:
  	debug(0, "unknown ioctl 0x%lx", cmd);
  
  	debug(1, "CCISS_GETPCIINFO:   0x%lx", CCISS_GETPCIINFO);
  	debug(1, "CCISS_GETINTINFO:   0x%lx", CCISS_GETINTINFO);
  	debug(1, "CCISS_SETINTINFO:   0x%lx", CCISS_SETINTINFO);
  	debug(1, "CCISS_GETNODENAME:  0x%lx", CCISS_GETNODENAME);
  	debug(1, "CCISS_SETNODENAME:  0x%lx", CCISS_SETNODENAME);
  	debug(1, "CCISS_GETHEARTBEAT: 0x%lx", CCISS_GETHEARTBEAT);
  	debug(1, "CCISS_GETBUSTYPES:  0x%lx", CCISS_GETBUSTYPES);
  	debug(1, "CCISS_GETFIRMVER:   0x%lx", CCISS_GETFIRMVER);
  	debug(1, "CCISS_GETDRIVERVER: 0x%lx", CCISS_GETDRIVERVER);
  	debug(1, "CCISS_REVALIDVOLS:  0x%lx", CCISS_REVALIDVOLS);
  	debug(1, "CCISS_PASSTHRU:     0x%lx", CCISS_PASSTHRU);
  
  	error = ENOIOCTL;
  	break;
      }
  
      return(error);
  }
  