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aic79xx_osm.c

/*
 * Adaptec AIC79xx device driver for Linux.
 *
 * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
 *
 * --------------------------------------------------------------------------
 * Copyright (c) 1994-2000 Justin T. Gibbs.
 * Copyright (c) 1997-1999 Doug Ledford
 * Copyright (c) 2000-2003 Adaptec Inc.
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#include "aic79xx_osm.h"
#include "aic79xx_inline.h"
#include <scsi/scsicam.h>

static struct scsi_transport_template *ahd_linux_transport_template = NULL;

#include <linux/init.h>       /* __setup */
#include <linux/mm.h>         /* For fetching system memory size */
#include <linux/blkdev.h>           /* For block_size() */
#include <linux/delay.h>      /* For ssleep/msleep */
#include <linux/device.h>

/*
 * Bucket size for counting good commands in between bad ones.
 */
#define AHD_LINUX_ERR_THRESH  1000

/*
 * Set this to the delay in seconds after SCSI bus reset.
 * Note, we honor this only for the initial bus reset.
 * The scsi error recovery code performs its own bus settle
 * delay handling for error recovery actions.
 */
#ifdef CONFIG_AIC79XX_RESET_DELAY_MS
#define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
#else
#define AIC79XX_RESET_DELAY 5000
#endif

/*
 * To change the default number of tagged transactions allowed per-device,
 * add a line to the lilo.conf file like:
 * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 * which will result in the first four devices on the first two
 * controllers being set to a tagged queue depth of 32.
 *
 * The tag_commands is an array of 16 to allow for wide and twin adapters.
 * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 * for channel 1.
 */
typedef struct {
      uint16_t tag_commands[16];    /* Allow for wide/twin adapters. */
} adapter_tag_info_t;

/*
 * Modify this as you see fit for your system.
 *
 * 0              tagged queuing disabled
 * 1 <= n <= 253  n == max tags ever dispatched.
 *
 * The driver will throttle the number of commands dispatched to a
 * device if it returns queue full.  For devices with a fixed maximum
 * queue depth, the driver will eventually determine this depth and
 * lock it in (a console message is printed to indicate that a lock
 * has occurred).  On some devices, queue full is returned for a temporary
 * resource shortage.  These devices will return queue full at varying
 * depths.  The driver will throttle back when the queue fulls occur and
 * attempt to slowly increase the depth over time as the device recovers
 * from the resource shortage.
 *
 * In this example, the first line will disable tagged queueing for all
 * the devices on the first probed aic79xx adapter.
 *
 * The second line enables tagged queueing with 4 commands/LUN for IDs
 * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 * driver to attempt to use up to 64 tags for ID 1.
 *
 * The third line is the same as the first line.
 *
 * The fourth line disables tagged queueing for devices 0 and 3.  It
 * enables tagged queueing for the other IDs, with 16 commands/LUN
 * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 * IDs 2, 5-7, and 9-15.
 */

/*
 * NOTE: The below structure is for reference only, the actual structure
 *       to modify in order to change things is just below this comment block.
adapter_tag_info_t aic79xx_tag_info[] =
{
      {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
      {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
      {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
      {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
};
*/

#ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
#define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
#else
#define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
#endif

#define AIC79XX_CONFIGED_TAG_COMMANDS {                           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,           \
      AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE            \
}

/*
 * By default, use the number of commands specified by
 * the users kernel configuration.
 */
static adapter_tag_info_t aic79xx_tag_info[] =
{
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS},
      {AIC79XX_CONFIGED_TAG_COMMANDS}
};

/*
 * The I/O cell on the chip is very configurable in respect to its analog
 * characteristics.  Set the defaults here; they can be overriden with
 * the proper insmod parameters.
 */
struct ahd_linux_iocell_opts
{
      uint8_t     precomp;
      uint8_t     slewrate;
      uint8_t amplitude;
};
#define AIC79XX_DEFAULT_PRECOMP           0xFF
#define AIC79XX_DEFAULT_SLEWRATE    0xFF
#define AIC79XX_DEFAULT_AMPLITUDE   0xFF
#define AIC79XX_DEFAULT_IOOPTS                  \
{                                   \
      AIC79XX_DEFAULT_PRECOMP,            \
      AIC79XX_DEFAULT_SLEWRATE,           \
      AIC79XX_DEFAULT_AMPLITUDE           \
}
#define AIC79XX_PRECOMP_INDEX 0
#define AIC79XX_SLEWRATE_INDEX      1
#define AIC79XX_AMPLITUDE_INDEX     2
static struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
{
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS,
      AIC79XX_DEFAULT_IOOPTS
};

/*
 * There should be a specific return value for this in scsi.h, but
 * it seems that most drivers ignore it.
 */
#define DID_UNDERFLOW   DID_ERROR

void
ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
{
      printk("(scsi%d:%c:%d:%d): ",
             ahd->platform_data->host->host_no,
             scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
             scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
             scb != NULL ? SCB_GET_LUN(scb) : -1);
}

/*
 * XXX - these options apply unilaterally to _all_ adapters
 *       cards in the system.  This should be fixed.  Exceptions to this
 *       rule are noted in the comments.
 */

/*
 * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 * has no effect on any later resets that might occur due to things like
 * SCSI bus timeouts.
 */
static uint32_t aic79xx_no_reset;

/*
 * Should we force EXTENDED translation on a controller.
 *     0 == Use whatever is in the SEEPROM or default to off
 *     1 == Use whatever is in the SEEPROM or default to on
 */
static uint32_t aic79xx_extended;

/*
 * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 * dubious at best.  To my knowledge, this option has never actually
 * solved a PCI parity problem, but on certain machines with broken PCI
 * chipset configurations, it can generate tons of false error messages.
 * It's included in the driver for completeness.
 *   0         = Shut off PCI parity check
 *   non-0 = Enable PCI parity check
 *
 * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
 * variable to -1 you would actually want to simply pass the variable
 * name without a number.  That will invert the 0 which will result in
 * -1.
 */
static uint32_t aic79xx_pci_parity = ~0;

/*
 * There are lots of broken chipsets in the world.  Some of them will
 * violate the PCI spec when we issue byte sized memory writes to our
 * controller.  I/O mapped register access, if allowed by the given
 * platform, will work in almost all cases.
 */
uint32_t aic79xx_allow_memio = ~0;

/*
 * So that we can set how long each device is given as a selection timeout.
 * The table of values goes like this:
 *   0 - 256ms
 *   1 - 128ms
 *   2 - 64ms
 *   3 - 32ms
 * We default to 256ms because some older devices need a longer time
 * to respond to initial selection.
 */
static uint32_t aic79xx_seltime;

/*
 * Certain devices do not perform any aging on commands.  Should the
 * device be saturated by commands in one portion of the disk, it is
 * possible for transactions on far away sectors to never be serviced.
 * To handle these devices, we can periodically send an ordered tag to
 * force all outstanding transactions to be serviced prior to a new
 * transaction.
 */
uint32_t aic79xx_periodic_otag;

/* Some storage boxes are using an LSI chip which has a bug making it
 * impossible to use aic79xx Rev B chip in 320 speeds.  The following
 * storage boxes have been reported to be buggy:
 * EonStor 3U 16-Bay: U16U-G3A3
 * EonStor 2U 12-Bay: U12U-G3A3
 * SentinelRAID: 2500F R5 / R6
 * SentinelRAID: 2500F R1
 * SentinelRAID: 2500F/1500F
 * SentinelRAID: 150F
 * 
 * To get around this LSI bug, you can set your board to 160 mode
 * or you can enable the SLOWCRC bit.
 */
uint32_t aic79xx_slowcrc;

/*
 * Module information and settable options.
 */
static char *aic79xx = NULL;

MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(AIC79XX_DRIVER_VERSION);
module_param(aic79xx, charp, 0444);
MODULE_PARM_DESC(aic79xx,
"period delimited, options string.\n"
"     verbose                 Enable verbose/diagnostic logging\n"
"     allow_memio       Allow device registers to be memory mapped\n"
"     debug             Bitmask of debug values to enable\n"
"     no_reset          Supress initial bus resets\n"
"     extended          Enable extended geometry on all controllers\n"
"     periodic_otag           Send an ordered tagged transaction\n"
"                       periodically to prevent tag starvation.\n"
"                       This may be required by some older disk\n"
"                       or drives/RAID arrays.\n"
"     tag_info:<tag_str>      Set per-target tag depth\n"
"     global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
"     slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
"     precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
"     amplitude:<int>         Set the signal amplitude (0-7).\n"
"     seltime:<int>           Selection Timeout:\n"
"                       (0/256ms,1/128ms,2/64ms,3/32ms)\n"
"     slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"          
"\n"
"     Sample /etc/modprobe.conf line:\n"
"           Enable verbose logging\n"
"           Set tag depth on Controller 2/Target 2 to 10 tags\n"
"           Shorten the selection timeout to 128ms\n"
"\n"
"     options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
"\n");

static void ahd_linux_handle_scsi_status(struct ahd_softc *,
                               struct scsi_device *,
                               struct scb *);
static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
                               struct scsi_cmnd *cmd);
static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
                             struct ahd_devinfo *devinfo);
static void ahd_linux_device_queue_depth(struct scsi_device *);
static int ahd_linux_run_command(struct ahd_softc*,
                         struct ahd_linux_device *,
                         struct scsi_cmnd *);
static void ahd_linux_setup_tag_info_global(char *p);
static int  aic79xx_setup(char *c);

static int ahd_linux_unit;


/****************************** Inlines ***************************************/
static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);

static __inline void
ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
{
      struct scsi_cmnd *cmd;
      int direction;

      cmd = scb->io_ctx;
      direction = cmd->sc_data_direction;
      ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
      if (cmd->use_sg != 0) {
            struct scatterlist *sg;

            sg = (struct scatterlist *)cmd->request_buffer;
            pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
      } else if (cmd->request_bufflen != 0) {
            pci_unmap_single(ahd->dev_softc,
                         scb->platform_data->buf_busaddr,
                         cmd->request_bufflen, direction);
      }
}

/******************************** Macros **************************************/
#define BUILD_SCSIID(ahd, cmd)                                    \
      (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)

/*
 * Return a string describing the driver.
 */
static const char *
ahd_linux_info(struct Scsi_Host *host)
{
      static char buffer[512];
      char  ahd_info[256];
      char   *bp;
      struct ahd_softc *ahd;

      bp = &buffer[0];
      ahd = *(struct ahd_softc **)host->hostdata;
      memset(bp, 0, sizeof(buffer));
      strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
      strcat(bp, AIC79XX_DRIVER_VERSION);
      strcat(bp, "\n");
      strcat(bp, "        <");
      strcat(bp, ahd->description);
      strcat(bp, ">\n");
      strcat(bp, "        ");
      ahd_controller_info(ahd, ahd_info);
      strcat(bp, ahd_info);
      strcat(bp, "\n");

      return (bp);
}

/*
 * Queue an SCB to the controller.
 */
static int
ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
{
      struct       ahd_softc *ahd;
      struct       ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
      int rtn = SCSI_MLQUEUE_HOST_BUSY;

      ahd = *(struct ahd_softc **)cmd->device->host->hostdata;

      cmd->scsi_done = scsi_done;
      cmd->result = CAM_REQ_INPROG << 16;
      rtn = ahd_linux_run_command(ahd, dev, cmd);

      return rtn;
}

static inline struct scsi_target **
ahd_linux_target_in_softc(struct scsi_target *starget)
{
      struct      ahd_softc *ahd =
            *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
      unsigned int target_offset;

      target_offset = starget->id;
      if (starget->channel != 0)
            target_offset += 8;

      return &ahd->platform_data->starget[target_offset];
}

static int
ahd_linux_target_alloc(struct scsi_target *starget)
{
      struct      ahd_softc *ahd =
            *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
      struct seeprom_config *sc = ahd->seep_config;
      unsigned long flags;
      struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
      struct ahd_devinfo devinfo;
      struct ahd_initiator_tinfo *tinfo;
      struct ahd_tmode_tstate *tstate;
      char channel = starget->channel + 'A';

      ahd_lock(ahd, &flags);

      BUG_ON(*ahd_targp != NULL);

      *ahd_targp = starget;

      if (sc) {
            int flags = sc->device_flags[starget->id];

            tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                                  starget->id, &tstate);

            if ((flags  & CFPACKETIZED) == 0) {
                  /* Do not negotiate packetized transfers */
                  spi_rd_strm(starget) = 0;
                  spi_pcomp_en(starget) = 0;
                  spi_rti(starget) = 0;
                  spi_wr_flow(starget) = 0;
                  spi_hold_mcs(starget) = 0;
            } else {
                  if ((ahd->features & AHD_RTI) == 0)
                        spi_rti(starget) = 0;
            }

            if ((flags & CFQAS) == 0)
                  spi_qas(starget) = 0;

            /* Transinfo values have been set to BIOS settings */
            spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
            spi_min_period(starget) = tinfo->user.period;
            spi_max_offset(starget) = tinfo->user.offset;
      }

      tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
                            starget->id, &tstate);
      ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
                      CAM_LUN_WILDCARD, channel,
                      ROLE_INITIATOR);
      ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
                   AHD_TRANS_GOAL, /*paused*/FALSE);
      ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
                  AHD_TRANS_GOAL, /*paused*/FALSE);
      ahd_unlock(ahd, &flags);

      return 0;
}

static void
ahd_linux_target_destroy(struct scsi_target *starget)
{
      struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);

      *ahd_targp = NULL;
}

static int
ahd_linux_slave_alloc(struct scsi_device *sdev)
{
      struct      ahd_softc *ahd =
            *((struct ahd_softc **)sdev->host->hostdata);
      struct ahd_linux_device *dev;

      if (bootverbose)
            printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);

      dev = scsi_transport_device_data(sdev);
      memset(dev, 0, sizeof(*dev));

      /*
       * We start out life using untagged
       * transactions of which we allow one.
       */
      dev->openings = 1;

      /*
       * Set maxtags to 0.  This will be changed if we
       * later determine that we are dealing with
       * a tagged queuing capable device.
       */
      dev->maxtags = 0;
      
      return (0);
}

static int
ahd_linux_slave_configure(struct scsi_device *sdev)
{
      struct      ahd_softc *ahd;

      ahd = *((struct ahd_softc **)sdev->host->hostdata);
      if (bootverbose)
            sdev_printk(KERN_INFO, sdev, "Slave Configure\n");

      ahd_linux_device_queue_depth(sdev);

      /* Initial Domain Validation */
      if (!spi_initial_dv(sdev->sdev_target))
            spi_dv_device(sdev);

      return 0;
}

#if defined(__i386__)
/*
 * Return the disk geometry for the given SCSI device.
 */
static int
ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
                sector_t capacity, int geom[])
{
      uint8_t *bh;
      int    heads;
      int    sectors;
      int    cylinders;
      int    ret;
      int    extended;
      struct       ahd_softc *ahd;

      ahd = *((struct ahd_softc **)sdev->host->hostdata);

      bh = scsi_bios_ptable(bdev);
      if (bh) {
            ret = scsi_partsize(bh, capacity,
                            &geom[2], &geom[0], &geom[1]);
            kfree(bh);
            if (ret != -1)
                  return (ret);
      }
      heads = 64;
      sectors = 32;
      cylinders = aic_sector_div(capacity, heads, sectors);

      if (aic79xx_extended != 0)
            extended = 1;
      else
            extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
      if (extended && cylinders >= 1024) {
            heads = 255;
            sectors = 63;
            cylinders = aic_sector_div(capacity, heads, sectors);
      }
      geom[0] = heads;
      geom[1] = sectors;
      geom[2] = cylinders;
      return (0);
}
#endif

/*
 * Abort the current SCSI command(s).
 */
static int
ahd_linux_abort(struct scsi_cmnd *cmd)
{
      int error;
      
      error = ahd_linux_queue_abort_cmd(cmd);

      return error;
}

/*
 * Attempt to send a target reset message to the device that timed out.
 */
static int
ahd_linux_dev_reset(struct scsi_cmnd *cmd)
{
      struct ahd_softc *ahd;
      struct ahd_linux_device *dev;
      struct scb *reset_scb;
      u_int  cdb_byte;
      int    retval = SUCCESS;
      int    paused;
      int    wait;
      struct      ahd_initiator_tinfo *tinfo;
      struct      ahd_tmode_tstate *tstate;
      unsigned long flags;
      DECLARE_COMPLETION(done);

      reset_scb = NULL;
      paused = FALSE;
      wait = FALSE;
      ahd = *(struct ahd_softc **)cmd->device->host->hostdata;

      scmd_printk(KERN_INFO, cmd,
                "Attempting to queue a TARGET RESET message:");

      printf("CDB:");
      for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
            printf(" 0x%x", cmd->cmnd[cdb_byte]);
      printf("\n");

      /*
       * Determine if we currently own this command.
       */
      dev = scsi_transport_device_data(cmd->device);

      if (dev == NULL) {
            /*
             * No target device for this command exists,
             * so we must not still own the command.
             */
            scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
            return SUCCESS;
      }

      /*
       * Generate us a new SCB
       */
      reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
      if (!reset_scb) {
            scmd_printk(KERN_INFO, cmd, "No SCB available\n");
            return FAILED;
      }

      tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                            cmd->device->id, &tstate);
      reset_scb->io_ctx = cmd;
      reset_scb->platform_data->dev = dev;
      reset_scb->sg_count = 0;
      ahd_set_residual(reset_scb, 0);
      ahd_set_sense_residual(reset_scb, 0);
      reset_scb->platform_data->xfer_len = 0;
      reset_scb->hscb->control = 0;
      reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
      reset_scb->hscb->lun = cmd->device->lun;
      reset_scb->hscb->cdb_len = 0;
      reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
      reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
      if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
            reset_scb->flags |= SCB_PACKETIZED;
      } else {
            reset_scb->hscb->control |= MK_MESSAGE;
      }
      dev->openings--;
      dev->active++;
      dev->commands_issued++;

      ahd_lock(ahd, &flags);

      LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
      ahd_queue_scb(ahd, reset_scb);

      ahd->platform_data->eh_done = &done;
      ahd_unlock(ahd, &flags);

      printf("%s: Device reset code sleeping\n", ahd_name(ahd));
      if (!wait_for_completion_timeout(&done, 5 * HZ)) {
            ahd_lock(ahd, &flags);
            ahd->platform_data->eh_done = NULL;
            ahd_unlock(ahd, &flags);
            printf("%s: Device reset timer expired (active %d)\n",
                   ahd_name(ahd), dev->active);
            retval = FAILED;
      }
      printf("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);

      return (retval);
}

/*
 * Reset the SCSI bus.
 */
static int
ahd_linux_bus_reset(struct scsi_cmnd *cmd)
{
      struct ahd_softc *ahd;
      int    found;
      unsigned long flags;

      ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
            printf("%s: Bus reset called for cmd %p\n",
                   ahd_name(ahd), cmd);
#endif
      ahd_lock(ahd, &flags);

      found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
                          /*initiate reset*/TRUE);
      ahd_unlock(ahd, &flags);

      if (bootverbose)
            printf("%s: SCSI bus reset delivered. "
                   "%d SCBs aborted.\n", ahd_name(ahd), found);

      return (SUCCESS);
}

struct scsi_host_template aic79xx_driver_template = {
      .module                 = THIS_MODULE,
      .name             = "aic79xx",
      .proc_name        = "aic79xx",
      .proc_info        = ahd_linux_proc_info,
      .info             = ahd_linux_info,
      .queuecommand           = ahd_linux_queue,
      .eh_abort_handler = ahd_linux_abort,
      .eh_device_reset_handler = ahd_linux_dev_reset,
      .eh_bus_reset_handler   = ahd_linux_bus_reset,
#if defined(__i386__)
      .bios_param       = ahd_linux_biosparam,
#endif
      .can_queue        = AHD_MAX_QUEUE,
      .this_id          = -1,
      .cmd_per_lun            = 2,
      .use_clustering         = ENABLE_CLUSTERING,
      .slave_alloc            = ahd_linux_slave_alloc,
      .slave_configure  = ahd_linux_slave_configure,
      .target_alloc           = ahd_linux_target_alloc,
      .target_destroy         = ahd_linux_target_destroy,
};

/******************************** Bus DMA *************************************/
int
ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
               bus_size_t alignment, bus_size_t boundary,
               dma_addr_t lowaddr, dma_addr_t highaddr,
               bus_dma_filter_t *filter, void *filterarg,
               bus_size_t maxsize, int nsegments,
               bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
{
      bus_dma_tag_t dmat;

      dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
      if (dmat == NULL)
            return (ENOMEM);

      /*
       * Linux is very simplistic about DMA memory.  For now don't
       * maintain all specification information.  Once Linux supplies
       * better facilities for doing these operations, or the
       * needs of this particular driver change, we might need to do
       * more here.
       */
      dmat->alignment = alignment;
      dmat->boundary = boundary;
      dmat->maxsize = maxsize;
      *ret_tag = dmat;
      return (0);
}

void
ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
{
      free(dmat, M_DEVBUF);
}

int
ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
             int flags, bus_dmamap_t *mapp)
{
      *vaddr = pci_alloc_consistent(ahd->dev_softc,
                              dmat->maxsize, mapp);
      if (*vaddr == NULL)
            return (ENOMEM);
      return(0);
}

void
ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
            void* vaddr, bus_dmamap_t map)
{
      pci_free_consistent(ahd->dev_softc, dmat->maxsize,
                      vaddr, map);
}

int
ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
            void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
            void *cb_arg, int flags)
{
      /*
       * Assume for now that this will only be used during
       * initialization and not for per-transaction buffer mapping.
       */
      bus_dma_segment_t stack_sg;

      stack_sg.ds_addr = map;
      stack_sg.ds_len = dmat->maxsize;
      cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
      return (0);
}

void
ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
{
}

int
ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
{
      /* Nothing to do */
      return (0);
}

/********************* Platform Dependent Functions ***************************/
static void
ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
{

      if ((instance >= 0)
       && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
            uint8_t *iocell_info;

            iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
            iocell_info[index] = value & 0xFFFF;
            if (bootverbose)
                  printf("iocell[%d:%ld] = %d\n", instance, index, value);
      }
}

static void
ahd_linux_setup_tag_info_global(char *p)
{
      int tags, i, j;

      tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
      printf("Setting Global Tags= %d\n", tags);

      for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
            for (j = 0; j < AHD_NUM_TARGETS; j++) {
                  aic79xx_tag_info[i].tag_commands[j] = tags;
            }
      }
}

static void
ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
{

      if ((instance >= 0) && (targ >= 0)
       && (instance < ARRAY_SIZE(aic79xx_tag_info))
       && (targ < AHD_NUM_TARGETS)) {
            aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
            if (bootverbose)
                  printf("tag_info[%d:%d] = %d\n", instance, targ, value);
      }
}

static char *
ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
                   void (*callback)(u_long, int, int, int32_t),
                   u_long callback_arg)
{
      char  *tok_end;
      char  *tok_end2;
      int      i;
      int      instance;
      int    targ;
      int    done;
      char   tok_list[] = {'.', ',', '{', '}', '\0'};

      /* All options use a ':' name/arg separator */
      if (*opt_arg != ':')
            return (opt_arg);
      opt_arg++;
      instance = -1;
      targ = -1;
      done = FALSE;
      /*
       * Restore separator that may be in
       * the middle of our option argument.
       */
      tok_end = strchr(opt_arg, '\0');
      if (tok_end < end)
            *tok_end = ',';
      while (!done) {
            switch (*opt_arg) {
            case '{':
                  if (instance == -1) {
                        instance = 0;
                  } else {
                        if (depth > 1) {
                              if (targ == -1)
                                    targ = 0;
                        } else {
                              printf("Malformed Option %s\n",
                                     opt_name);
                              done = TRUE;
                        }
                  }
                  opt_arg++;
                  break;
            case '}':
                  if (targ != -1)
                        targ = -1;
                  else if (instance != -1)
                        instance = -1;
                  opt_arg++;
                  break;
            case ',':
            case '.':
                  if (instance == -1)
                        done = TRUE;
                  else if (targ >= 0)
                        targ++;
                  else if (instance >= 0)
                        instance++;
                  opt_arg++;
                  break;
            case '\0':
                  done = TRUE;
                  break;
            default:
                  tok_end = end;
                  for (i = 0; tok_list[i]; i++) {
                        tok_end2 = strchr(opt_arg, tok_list[i]);
                        if ((tok_end2) && (tok_end2 < tok_end))
                              tok_end = tok_end2;
                  }
                  callback(callback_arg, instance, targ,
                         simple_strtol(opt_arg, NULL, 0));
                  opt_arg = tok_end;
                  break;
            }
      }
      return (opt_arg);
}

/*
 * Handle Linux boot parameters. This routine allows for assigning a value
 * to a parameter with a ':' between the parameter and the value.
 * ie. aic79xx=stpwlev:1,extended
 */
static int
aic79xx_setup(char *s)
{
      int   i, n;
      char   *p;
      char   *end;

      static struct {
            const char *name;
            uint32_t *flag;
      } options[] = {
            { "extended", &aic79xx_extended },
            { "no_reset", &aic79xx_no_reset },
            { "verbose", &aic79xx_verbose },
            { "allow_memio", &aic79xx_allow_memio},
#ifdef AHD_DEBUG
            { "debug", &ahd_debug },
#endif
            { "periodic_otag", &aic79xx_periodic_otag },
            { "pci_parity", &aic79xx_pci_parity },
            { "seltime", &aic79xx_seltime },
            { "tag_info", NULL },
            { "global_tag_depth", NULL},
            { "slewrate", NULL },
            { "precomp", NULL },
            { "amplitude", NULL },
            { "slowcrc", &aic79xx_slowcrc },
      };

      end = strchr(s, '\0');

      /*
       * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
       * will never be 0 in this case.
       */
      n = 0;

      while ((p = strsep(&s, ",.")) != NULL) {
            if (*p == '\0')
                  continue;
            for (i = 0; i < ARRAY_SIZE(options); i++) {

                  n = strlen(options[i].name);
                  if (strncmp(options[i].name, p, n) == 0)
                        break;
            }
            if (i == ARRAY_SIZE(options))
                  continue;

            if (strncmp(p, "global_tag_depth", n) == 0) {
                  ahd_linux_setup_tag_info_global(p + n);
            } else if (strncmp(p, "tag_info", n) == 0) {
                  s = ahd_parse_brace_option("tag_info", p + n, end,
                      2, ahd_linux_setup_tag_info, 0);
            } else if (strncmp(p, "slewrate", n) == 0) {
                  s = ahd_parse_brace_option("slewrate",
                      p + n, end, 1, ahd_linux_setup_iocell_info,
                      AIC79XX_SLEWRATE_INDEX);
            } else if (strncmp(p, "precomp", n) == 0) {
                  s = ahd_parse_brace_option("precomp",
                      p + n, end, 1, ahd_linux_setup_iocell_info,
                      AIC79XX_PRECOMP_INDEX);
            } else if (strncmp(p, "amplitude", n) == 0) {
                  s = ahd_parse_brace_option("amplitude",
                      p + n, end, 1, ahd_linux_setup_iocell_info,
                      AIC79XX_AMPLITUDE_INDEX);
            } else if (p[n] == ':') {
                  *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
            } else if (!strncmp(p, "verbose", n)) {
                  *(options[i].flag) = 1;
            } else {
                  *(options[i].flag) ^= 0xFFFFFFFF;
            }
      }
      return 1;
}

__setup("aic79xx=", aic79xx_setup);

uint32_t aic79xx_verbose;

int
ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
{
      char  buf[80];
      struct      Scsi_Host *host;
      char  *new_name;
      u_long      s;
      int   retval;

      template->name = ahd->description;
      host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
      if (host == NULL)
            return (ENOMEM);

      *((struct ahd_softc **)host->hostdata) = ahd;
      ahd->platform_data->host = host;
      host->can_queue = AHD_MAX_QUEUE;
      host->cmd_per_lun = 2;
      host->sg_tablesize = AHD_NSEG;
      host->this_id = ahd->our_id;
      host->irq = ahd->platform_data->irq;
      host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
      host->max_lun = AHD_NUM_LUNS;
      host->max_channel = 0;
      host->sg_tablesize = AHD_NSEG;
      ahd_lock(ahd, &s);
      ahd_set_unit(ahd, ahd_linux_unit++);
      ahd_unlock(ahd, &s);
      sprintf(buf, "scsi%d", host->host_no);
      new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
      if (new_name != NULL) {
            strcpy(new_name, buf);
            ahd_set_name(ahd, new_name);
      }
      host->unique_id = ahd->unit;
      ahd_linux_initialize_scsi_bus(ahd);
      ahd_intr_enable(ahd, TRUE);

      host->transportt = ahd_linux_transport_template;

      retval = scsi_add_host(host, &ahd->dev_softc->dev);
      if (retval) {
            printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
            scsi_host_put(host);
            return retval;
      }

      scsi_scan_host(host);
      return 0;
}

uint64_t
ahd_linux_get_memsize(void)
{
      struct sysinfo si;

      si_meminfo(&si);
      return ((uint64_t)si.totalram << PAGE_SHIFT);
}

/*
 * Place the SCSI bus into a known state by either resetting it,
 * or forcing transfer negotiations on the next command to any
 * target.
 */
static void
ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
{
      u_int target_id;
      u_int numtarg;
      unsigned long s;

      target_id = 0;
      numtarg = 0;

      if (aic79xx_no_reset != 0)
            ahd->flags &= ~AHD_RESET_BUS_A;

      if ((ahd->flags & AHD_RESET_BUS_A) != 0)
            ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
      else
            numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;

      ahd_lock(ahd, &s);

      /*
       * Force negotiation to async for all targets that
       * will not see an initial bus reset.
       */
      for (; target_id < numtarg; target_id++) {
            struct ahd_devinfo devinfo;
            struct ahd_initiator_tinfo *tinfo;
            struct ahd_tmode_tstate *tstate;

            tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                                  target_id, &tstate);
            ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
                            CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
            ahd_update_neg_request(ahd, &devinfo, tstate,
                               tinfo, AHD_NEG_ALWAYS);
      }
      ahd_unlock(ahd, &s);
      /* Give the bus some time to recover */
      if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
            ahd_freeze_simq(ahd);
            msleep(AIC79XX_RESET_DELAY);
            ahd_release_simq(ahd);
      }
}

int
ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
{
      ahd->platform_data =
          malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
      if (ahd->platform_data == NULL)
            return (ENOMEM);
      memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
      ahd->platform_data->irq = AHD_LINUX_NOIRQ;
      ahd_lockinit(ahd);
      ahd->seltime = (aic79xx_seltime & 0x3) << 4;
      return (0);
}

void
ahd_platform_free(struct ahd_softc *ahd)
{
      struct scsi_target *starget;
      int i;

      if (ahd->platform_data != NULL) {
            /* destroy all of the device and target objects */
            for (i = 0; i < AHD_NUM_TARGETS; i++) {
                  starget = ahd->platform_data->starget[i];
                  if (starget != NULL) {
                        ahd->platform_data->starget[i] = NULL;
                  }
            }

            if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
                  free_irq(ahd->platform_data->irq, ahd);
            if (ahd->tags[0] == BUS_SPACE_PIO
             && ahd->bshs[0].ioport != 0)
                  release_region(ahd->bshs[0].ioport, 256);
            if (ahd->tags[1] == BUS_SPACE_PIO
             && ahd->bshs[1].ioport != 0)
                  release_region(ahd->bshs[1].ioport, 256);
            if (ahd->tags[0] == BUS_SPACE_MEMIO
             && ahd->bshs[0].maddr != NULL) {
                  iounmap(ahd->bshs[0].maddr);
                  release_mem_region(ahd->platform_data->mem_busaddr,
                                 0x1000);
            }
            if (ahd->platform_data->host)
                  scsi_host_put(ahd->platform_data->host);

            free(ahd->platform_data, M_DEVBUF);
      }
}

void
ahd_platform_init(struct ahd_softc *ahd)
{
      /*
       * Lookup and commit any modified IO Cell options.
       */
      if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
            struct ahd_linux_iocell_opts *iocell_opts;

            iocell_opts = &aic79xx_iocell_info[ahd->unit];
            if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
                  AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
            if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
                  AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
            if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
                  AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
      }

}

void
ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
{
      ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
                        SCB_GET_CHANNEL(ahd, scb),
                        SCB_GET_LUN(scb), SCB_LIST_NULL,
                        ROLE_UNKNOWN, CAM_REQUEUE_REQ);
}

void
ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
                  struct ahd_devinfo *devinfo, ahd_queue_alg alg)
{
      struct ahd_linux_device *dev;
      int was_queuing;
      int now_queuing;

      if (sdev == NULL)
            return;

      dev = scsi_transport_device_data(sdev);

      if (dev == NULL)
            return;
      was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
      switch (alg) {
      default:
      case AHD_QUEUE_NONE:
            now_queuing = 0;
            break; 
      case AHD_QUEUE_BASIC:
            now_queuing = AHD_DEV_Q_BASIC;
            break;
      case AHD_QUEUE_TAGGED:
            now_queuing = AHD_DEV_Q_TAGGED;
            break;
      }
      if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
       && (was_queuing != now_queuing)
       && (dev->active != 0)) {
            dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
            dev->qfrozen++;
      }

      dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
      if (now_queuing) {
            u_int usertags;

            usertags = ahd_linux_user_tagdepth(ahd, devinfo);
            if (!was_queuing) {
                  /*
                   * Start out agressively and allow our
                   * dynamic queue depth algorithm to take
                   * care of the rest.
                   */
                  dev->maxtags = usertags;
                  dev->openings = dev->maxtags - dev->active;
            }
            if (dev->maxtags == 0) {
                  /*
                   * Queueing is disabled by the user.
                   */
                  dev->openings = 1;
            } else if (alg == AHD_QUEUE_TAGGED) {
                  dev->flags |= AHD_DEV_Q_TAGGED;
                  if (aic79xx_periodic_otag != 0)
                        dev->flags |= AHD_DEV_PERIODIC_OTAG;
            } else
                  dev->flags |= AHD_DEV_Q_BASIC;
      } else {
            /* We can only have one opening. */
            dev->maxtags = 0;
            dev->openings =  1 - dev->active;
      }

      switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
      case AHD_DEV_Q_BASIC:
            scsi_set_tag_type(sdev, MSG_SIMPLE_TASK);
            scsi_activate_tcq(sdev, dev->openings + dev->active);
            break;
      case AHD_DEV_Q_TAGGED:
            scsi_set_tag_type(sdev, MSG_ORDERED_TASK);
            scsi_activate_tcq(sdev, dev->openings + dev->active);
            break;
      default:
            /*
             * We allow the OS to queue 2 untagged transactions to
             * us at any time even though we can only execute them
             * serially on the controller/device.  This should
             * remove some latency.
             */
            scsi_deactivate_tcq(sdev, 1);
            break;
      }
}

int
ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
                  int lun, u_int tag, role_t role, uint32_t status)
{
      return 0;
}

static u_int
ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
{
      static int warned_user;
      u_int tags;

      tags = 0;
      if ((ahd->user_discenable & devinfo->target_mask) != 0) {
            if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {

                  if (warned_user == 0) {
                        printf(KERN_WARNING
"aic79xx: WARNING: Insufficient tag_info instances\n"
"aic79xx: for installed controllers.  Using defaults\n"
"aic79xx: Please update the aic79xx_tag_info array in\n"
"aic79xx: the aic79xx_osm.c source file.\n");
                        warned_user++;
                  }
                  tags = AHD_MAX_QUEUE;
            } else {
                  adapter_tag_info_t *tag_info;

                  tag_info = &aic79xx_tag_info[ahd->unit];
                  tags = tag_info->tag_commands[devinfo->target_offset];
                  if (tags > AHD_MAX_QUEUE)
                        tags = AHD_MAX_QUEUE;
            }
      }
      return (tags);
}

/*
 * Determines the queue depth for a given device.
 */
static void
ahd_linux_device_queue_depth(struct scsi_device *sdev)
{
      struct      ahd_devinfo devinfo;
      u_int tags;
      struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);

      ahd_compile_devinfo(&devinfo,
                      ahd->our_id,
                      sdev->sdev_target->id, sdev->lun,
                      sdev->sdev_target->channel == 0 ? 'A' : 'B',
                      ROLE_INITIATOR);
      tags = ahd_linux_user_tagdepth(ahd, &devinfo);
      if (tags != 0 && sdev->tagged_supported != 0) {

            ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
            ahd_send_async(ahd, devinfo.channel, devinfo.target,
                         devinfo.lun, AC_TRANSFER_NEG);
            ahd_print_devinfo(ahd, &devinfo);
            printf("Tagged Queuing enabled.  Depth %d\n", tags);
      } else {
            ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
            ahd_send_async(ahd, devinfo.channel, devinfo.target,
                         devinfo.lun, AC_TRANSFER_NEG);
      }
}

static int
ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
                  struct scsi_cmnd *cmd)
{
      struct       scb *scb;
      struct       hardware_scb *hscb;
      struct       ahd_initiator_tinfo *tinfo;
      struct       ahd_tmode_tstate *tstate;
      u_int  col_idx;
      uint16_t mask;
      unsigned long flags;

      ahd_lock(ahd, &flags);

      /*
       * Get an scb to use.
       */
      tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
                            cmd->device->id, &tstate);
      if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
       || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
            col_idx = AHD_NEVER_COL_IDX;
      } else {
            col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
                                  cmd->device->lun);
      }
      if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
            ahd->flags |= AHD_RESOURCE_SHORTAGE;
            ahd_unlock(ahd, &flags);
            return SCSI_MLQUEUE_HOST_BUSY;
      }

      scb->io_ctx = cmd;
      scb->platform_data->dev = dev;
      hscb = scb->hscb;
      cmd->host_scribble = (char *)scb;

      /*
       * Fill out basics of the HSCB.
       */
      hscb->control = 0;
      hscb->scsiid = BUILD_SCSIID(ahd, cmd);
      hscb->lun = cmd->device->lun;
      scb->hscb->task_management = 0;
      mask = SCB_GET_TARGET_MASK(ahd, scb);

      if ((ahd->user_discenable & mask) != 0)
            hscb->control |= DISCENB;

      if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
            scb->flags |= SCB_PACKETIZED;

      if ((tstate->auto_negotiate & mask) != 0) {
            scb->flags |= SCB_AUTO_NEGOTIATE;
            scb->hscb->control |= MK_MESSAGE;
      }

      if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
            int   msg_bytes;
            uint8_t tag_msgs[2];

            msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
            if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
                  hscb->control |= tag_msgs[0];
                  if (tag_msgs[0] == MSG_ORDERED_TASK)
                        dev->commands_since_idle_or_otag = 0;
            } else
            if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
             && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
                  hscb->control |= MSG_ORDERED_TASK;
                  dev->commands_since_idle_or_otag = 0;
            } else {
                  hscb->control |= MSG_SIMPLE_TASK;
            }
      }

      hscb->cdb_len = cmd->cmd_len;
      memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);

      scb->platform_data->xfer_len = 0;
      ahd_set_residual(scb, 0);
      ahd_set_sense_residual(scb, 0);
      scb->sg_count = 0;
      if (cmd->use_sg != 0) {
            void  *sg;
            struct       scatterlist *cur_seg;
            u_int  nseg;
            int    dir;

            cur_seg = (struct scatterlist *)cmd->request_buffer;
            dir = cmd->sc_data_direction;
            nseg = pci_map_sg(ahd->dev_softc, cur_seg,
                          cmd->use_sg, dir);
            scb->platform_data->xfer_len = 0;
            for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
                  dma_addr_t addr;
                  bus_size_t len;

                  addr = sg_dma_address(cur_seg);
                  len = sg_dma_len(cur_seg);
                  scb->platform_data->xfer_len += len;
                  sg = ahd_sg_setup(ahd, scb, sg, addr, len,
                                /*last*/nseg == 1);
            }
      } else if (cmd->request_bufflen != 0) {
            void *sg;
            dma_addr_t addr;
            int dir;

            sg = scb->sg_list;
            dir = cmd->sc_data_direction;
            addr = pci_map_single(ahd->dev_softc,
                              cmd->request_buffer,
                              cmd->request_bufflen, dir);
            scb->platform_data->xfer_len = cmd->request_bufflen;
            scb->platform_data->buf_busaddr = addr;
            sg = ahd_sg_setup(ahd, scb, sg, addr,
                          cmd->request_bufflen, /*last*/TRUE);
      }

      LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
      dev->openings--;
      dev->active++;
      dev->commands_issued++;

      if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
            dev->commands_since_idle_or_otag++;
      scb->flags |= SCB_ACTIVE;
      ahd_queue_scb(ahd, scb);

      ahd_unlock(ahd, &flags);

      return 0;
}

/*
 * SCSI controller interrupt handler.
 */
irqreturn_t
ahd_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
{
      struct      ahd_softc *ahd;
      u_long      flags;
      int   ours;

      ahd = (struct ahd_softc *) dev_id;
      ahd_lock(ahd, &flags); 
      ours = ahd_intr(ahd);
      ahd_unlock(ahd, &flags);
      return IRQ_RETVAL(ours);
}

void
ahd_send_async(struct ahd_softc *ahd, char channel,
             u_int target, u_int lun, ac_code code)
{
      switch (code) {
      case AC_TRANSFER_NEG:
      {
            char  buf[80];
            struct  scsi_target *starget;
            struct      info_str info;
            struct      ahd_initiator_tinfo *tinfo;
            struct      ahd_tmode_tstate *tstate;
            unsigned int target_ppr_options;

            BUG_ON(target == CAM_TARGET_WILDCARD);

            info.buffer = buf;
            info.length = sizeof(buf);
            info.offset = 0;
            info.pos = 0;
            tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
                                  target, &tstate);

            /*
             * Don't bother reporting results while
             * negotiations are still pending.
             */
            if (tinfo->curr.period != tinfo->goal.period
             || tinfo->curr.width != tinfo->goal.width
             || tinfo->curr.offset != tinfo->goal.offset
             || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
                  if (bootverbose == 0)
                        break;

            /*
             * Don't bother reporting results that
             * are identical to those last reported.
             */
            starget = ahd->platform_data->starget[target];
            if (starget == NULL)
                  break;

            target_ppr_options =
                  (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
                  + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
                  + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
                  + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
                  + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
                  + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
                  + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
                  + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);

            if (tinfo->curr.period == spi_period(starget)
                && tinfo->curr.width == spi_width(starget)
                && tinfo->curr.offset == spi_offset(starget)
             && tinfo->curr.ppr_options == target_ppr_options)
                  if (bootverbose == 0)
                        break;

            spi_period(starget) = tinfo->curr.period;
            spi_width(starget) = tinfo->curr.width;
            spi_offset(starget) = tinfo->curr.offset;
            spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
            spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
            spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
            spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
            spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
            spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
            spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
            spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
            spi_display_xfer_agreement(starget);
            break;
      }
        case AC_SENT_BDR:
      {
            WARN_ON(lun != CAM_LUN_WILDCARD);
            scsi_report_device_reset(ahd->platform_data->host,
                               channel - 'A', target);
            break;
      }
        case AC_BUS_RESET:
            if (ahd->platform_data->host != NULL) {
                  scsi_report_bus_reset(ahd->platform_data->host,
                                    channel - 'A');
            }
                break;
        default:
                panic("ahd_send_async: Unexpected async event");
        }
}

/*
 * Calls the higher level scsi done function and frees the scb.
 */
void
ahd_done(struct ahd_softc *ahd, struct scb *scb)
{
      struct scsi_cmnd *cmd;
      struct        ahd_linux_device *dev;

      if ((scb->flags & SCB_ACTIVE) == 0) {
            printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
            ahd_dump_card_state(ahd);
            panic("Stopping for safety");
      }
      LIST_REMOVE(scb, pending_links);
      cmd = scb->io_ctx;
      dev = scb->platform_data->dev;
      dev->active--;
      dev->openings++;
      if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
            cmd->result &= ~(CAM_DEV_QFRZN << 16);
            dev->qfrozen--;
      }
      ahd_linux_unmap_scb(ahd, scb);

      /*
       * Guard against stale sense data.
       * The Linux mid-layer assumes that sense
       * was retrieved anytime the first byte of
       * the sense buffer looks "sane".
       */
      cmd->sense_buffer[0] = 0;
      if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
            uint32_t amount_xferred;

            amount_xferred =
                ahd_get_transfer_length(scb) - ahd_get_residual(scb);
            if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
#ifdef AHD_DEBUG
                  if ((ahd_debug & AHD_SHOW_MISC) != 0) {
                        ahd_print_path(ahd, scb);
                        printf("Set CAM_UNCOR_PARITY\n");
                  }
#endif
                  ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
#ifdef AHD_REPORT_UNDERFLOWS
            /*
             * This code is disabled by default as some
             * clients of the SCSI system do not properly
             * initialize the underflow parameter.  This
             * results in spurious termination of commands
             * that complete as expected (e.g. underflow is
             * allowed as command can return variable amounts
             * of data.
             */
            } else if (amount_xferred < scb->io_ctx->underflow) {
                  u_int i;

                  ahd_print_path(ahd, scb);
                  printf("CDB:");
                  for (i = 0; i < scb->io_ctx->cmd_len; i++)
                        printf(" 0x%x", scb->io_ctx->cmnd[i]);
                  printf("\n");
                  ahd_print_path(ahd, scb);
                  printf("Saw underflow (%ld of %ld bytes). "
                         "Treated as error\n",
                        ahd_get_residual(scb),
                        ahd_get_transfer_length(scb));
                  ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
#endif
            } else {
                  ahd_set_transaction_status(scb, CAM_REQ_CMP);
            }
      } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
            ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
      }

      if (dev->openings == 1
       && ahd_get_transaction_status(scb) == CAM_REQ_CMP
       && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
            dev->tag_success_count++;
      /*
       * Some devices deal with temporary internal resource
       * shortages by returning queue full.  When the queue
       * full occurrs, we throttle back.  Slowly try to get
       * back to our previous queue depth.
       */
      if ((dev->openings + dev->active) < dev->maxtags
       && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
            dev->tag_success_count = 0;
            dev->openings++;
      }

      if (dev->active == 0)
            dev->commands_since_idle_or_otag = 0;

      if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
            printf("Recovery SCB completes\n");
            if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
             || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
                  ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);

            if (ahd->platform_data->eh_done)
                  complete(ahd->platform_data->eh_done);
      }

      ahd_free_scb(ahd, scb);
      ahd_linux_queue_cmd_complete(ahd, cmd);
}

static void
ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
                       struct scsi_device *sdev, struct scb *scb)
{
      struct      ahd_devinfo devinfo;
      struct ahd_linux_device *dev = scsi_transport_device_data(sdev);

      ahd_compile_devinfo(&devinfo,
                      ahd->our_id,
                      sdev->sdev_target->id, sdev->lun,
                      sdev->sdev_target->channel == 0 ? 'A' : 'B',
                      ROLE_INITIATOR);
      
      /*
       * We don't currently trust the mid-layer to
       * properly deal with queue full or busy.  So,
       * when one occurs, we tell the mid-layer to
       * unconditionally requeue the command to us
       * so that we can retry it ourselves.  We also
       * implement our own throttling mechanism so
       * we don't clobber the device with too many
       * commands.
       */
      switch (ahd_get_scsi_status(scb)) {
      default:
            break;
      case SCSI_STATUS_CHECK_COND:
      case SCSI_STATUS_CMD_TERMINATED:
      {
            struct scsi_cmnd *cmd;

            /*
             * Copy sense information to the OS's cmd
             * structure if it is available.
             */
            cmd = scb->io_ctx;
            if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
                  struct scsi_status_iu_header *siu;
                  u_int sense_size;
                  u_int sense_offset;

                  if (scb->flags & SCB_SENSE) {
                        sense_size = MIN(sizeof(struct scsi_sense_data)
                                     - ahd_get_sense_residual(scb),
                                     sizeof(cmd->sense_buffer));
                        sense_offset = 0;
                  } else {
                        /*
                         * Copy only the sense data into the provided
                         * buffer.
                         */
                        siu = (struct scsi_status_iu_header *)
                            scb->sense_data;
                        sense_size = MIN(scsi_4btoul(siu->sense_length),
                                    sizeof(cmd->sense_buffer));
                        sense_offset = SIU_SENSE_OFFSET(siu);
                  }

                  memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
                  memcpy(cmd->sense_buffer,
                         ahd_get_sense_buf(ahd, scb)
                         + sense_offset, sense_size);
                  cmd->result |= (DRIVER_SENSE << 24);

#ifdef AHD_DEBUG
                  if (ahd_debug & AHD_SHOW_SENSE) {
                        int i;

                        printf("Copied %d bytes of sense data at %d:",
                               sense_size, sense_offset);
                        for (i = 0; i < sense_size; i++) {
                              if ((i & 0xF) == 0)
                                    printf("\n");
                              printf("0x%x ", cmd->sense_buffer[i]);
                        }
                        printf("\n");
                  }
#endif
            }
            break;
      }
      case SCSI_STATUS_QUEUE_FULL:
            /*
             * By the time the core driver has returned this
             * command, all other commands that were queued
             * to us but not the device have been returned.
             * This ensures that dev->active is equal to
             * the number of commands actually queued to
             * the device.
             */
            dev->tag_success_count = 0;
            if (dev->active != 0) {
                  /*
                   * Drop our opening count to the number
                   * of commands currently outstanding.
                   */
                  dev->openings = 0;
#ifdef AHD_DEBUG
                  if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
                        ahd_print_path(ahd, scb);
                        printf("Dropping tag count to %d\n",
                               dev->active);
                  }
#endif
                  if (dev->active == dev->tags_on_last_queuefull) {

                        dev->last_queuefull_same_count++;
                        /*
                         * If we repeatedly see a queue full
                         * at the same queue depth, this
                         * device has a fixed number of tag
                         * slots.  Lock in this tag depth
                         * so we stop seeing queue fulls from
                         * this device.
                         */
                        if (dev->last_queuefull_same_count
                         == AHD_LOCK_TAGS_COUNT) {
                              dev->maxtags = dev->active;
                              ahd_print_path(ahd, scb);
                              printf("Locking max tag count at %d\n",
                                     dev->active);
                        }
                  } else {
                        dev->tags_on_last_queuefull = dev->active;
                        dev->last_queuefull_same_count = 0;
                  }
                  ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
                  ahd_set_scsi_status(scb, SCSI_STATUS_OK);
                  ahd_platform_set_tags(ahd, sdev, &devinfo,
                             (dev->flags & AHD_DEV_Q_BASIC)
                           ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
                  break;
            }
            /*
             * Drop down to a single opening, and treat this
             * as if the target returned BUSY SCSI status.
             */
            dev->openings = 1;
            ahd_platform_set_tags(ahd, sdev, &devinfo,
                       (dev->flags & AHD_DEV_Q_BASIC)
                     ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
            ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
      }
}

static void
ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
{
      int status;
      int new_status = DID_OK;
      int do_fallback = 0;
      int scsi_status;

      /*
       * Map CAM error codes into Linux Error codes.  We
       * avoid the conversion so that the DV code has the
       * full error information available when making
       * state change decisions.
       */

      status = ahd_cmd_get_transaction_status(cmd);
      switch (status) {
      case CAM_REQ_INPROG:
      case CAM_REQ_CMP:
            new_status = DID_OK;
            break;
      case CAM_AUTOSENSE_FAIL:
            new_status = DID_ERROR;
            /* Fallthrough */
      case CAM_SCSI_STATUS_ERROR:
            scsi_status = ahd_cmd_get_scsi_status(cmd);

            switch(scsi_status) {
            case SCSI_STATUS_CMD_TERMINATED:
            case SCSI_STATUS_CHECK_COND:
                  if ((cmd->result >> 24) != DRIVER_SENSE) {
                        do_fallback = 1;
                  } else {
                        struct scsi_sense_data *sense;
                        
                        sense = (struct scsi_sense_data *)
                              &cmd->sense_buffer;
                        if (sense->extra_len >= 5 &&
                            (sense->add_sense_code == 0x47
                             || sense->add_sense_code == 0x48))
                              do_fallback = 1;
                  }
                  break;
            default:
                  break;
            }
            break;
      case CAM_REQ_ABORTED:
            new_status = DID_ABORT;
            break;
      case CAM_BUSY:
            new_status = DID_BUS_BUSY;
            break;
      case CAM_REQ_INVALID:
      case CAM_PATH_INVALID:
            new_status = DID_BAD_TARGET;
            break;
      case CAM_SEL_TIMEOUT:
            new_status = DID_NO_CONNECT;
            break;
      case CAM_SCSI_BUS_RESET:
      case CAM_BDR_SENT:
            new_status = DID_RESET;
            break;
      case CAM_UNCOR_PARITY:
            new_status = DID_PARITY;
            do_fallback = 1;
            break;
      case CAM_CMD_TIMEOUT:
            new_status = DID_TIME_OUT;
            do_fallback = 1;
            break;
      case CAM_REQ_CMP_ERR:
      case CAM_UNEXP_BUSFREE:
      case CAM_DATA_RUN_ERR:
            new_status = DID_ERROR;
            do_fallback = 1;
            break;
      case CAM_UA_ABORT:
      case CAM_NO_HBA:
      case CAM_SEQUENCE_FAIL:
      case CAM_CCB_LEN_ERR:
      case CAM_PROVIDE_FAIL:
      case CAM_REQ_TERMIO:
      case CAM_UNREC_HBA_ERROR:
      case CAM_REQ_TOO_BIG:
            new_status = DID_ERROR;
            break;
      case CAM_REQUEUE_REQ:
            new_status = DID_REQUEUE;
            break;
      default:
            /* We should never get here */
            new_status = DID_ERROR;
            break;
      }

      if (do_fallback) {
            printf("%s: device overrun (status %x) on %d:%d:%d\n",
                   ahd_name(ahd), status, cmd->device->channel,
                   cmd->device->id, cmd->device->lun);
      }

      ahd_cmd_set_transaction_status(cmd, new_status);

      cmd->scsi_done(cmd);
}

void
ahd_freeze_simq(struct ahd_softc *ahd)
{
      scsi_block_requests(ahd->platform_data->host);
}

void
ahd_release_simq(struct ahd_softc *ahd)
{
      scsi_unblock_requests(ahd->platform_data->host);
}

static int
ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
{
      struct ahd_softc *ahd;
      struct ahd_linux_device *dev;
      struct scb *pending_scb;
      u_int  saved_scbptr;
      u_int  active_scbptr;
      u_int  last_phase;
      u_int  saved_scsiid;
      u_int  cdb_byte;
      int    retval;
      int    was_paused;
      int    paused;
      int    wait;
      int    disconnected;
      ahd_mode_state saved_modes;
      unsigned long flags;

      pending_scb = NULL;
      paused = FALSE;
      wait = FALSE;
      ahd = *(struct ahd_softc **)cmd->device->host->hostdata;

      scmd_printk(KERN_INFO, cmd,
                "Attempting to queue an ABORT message:");

      printf("CDB:");
      for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
            printf(" 0x%x", cmd->cmnd[cdb_byte]);
      printf("\n");

      ahd_lock(ahd, &flags);

      /*
       * First determine if we currently own this command.
       * Start by searching the device queue.  If not found
       * there, check the pending_scb list.  If not found
       * at all, and the system wanted us to just abort the
       * command, return success.
       */
      dev = scsi_transport_device_data(cmd->device);

      if (dev == NULL) {
            /*
             * No target device for this command exists,
             * so we must not still own the command.
             */
            scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
            retval = SUCCESS;
            goto no_cmd;
      }

      /*
       * See if we can find a matching cmd in the pending list.
       */
      LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
            if (pending_scb->io_ctx == cmd)
                  break;
      }

      if (pending_scb == NULL) {
            scmd_printk(KERN_INFO, cmd, "Command not found\n");
            goto no_cmd;
      }

      if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
            /*
             * We can't queue two recovery actions using the same SCB
             */
            retval = FAILED;
            goto  done;
      }

      /*
       * Ensure that the card doesn't do anything
       * behind our back.  Also make sure that we
       * didn't "just" miss an interrupt that would
       * affect this cmd.
       */
      was_paused = ahd_is_paused(ahd);
      ahd_pause_and_flushwork(ahd);
      paused = TRUE;

      if ((pending_scb->flags & SCB_ACTIVE) == 0) {
            scmd_printk(KERN_INFO, cmd, "Command already completed\n");
            goto no_cmd;
      }

      printf("%s: At time of recovery, card was %spaused\n",
             ahd_name(ahd), was_paused ? "" : "not ");
      ahd_dump_card_state(ahd);

      disconnected = TRUE;
      if (ahd_search_qinfifo(ahd, cmd->device->id, 
                         cmd->device->channel + 'A',
                         cmd->device->lun, 
                         pending_scb->hscb->tag,
                         ROLE_INITIATOR, CAM_REQ_ABORTED,
                         SEARCH_COMPLETE) > 0) {
            printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
                   ahd_name(ahd), cmd->device->channel, 
                   cmd->device->id, cmd->device->lun);
            retval = SUCCESS;
            goto done;
      }

      saved_modes = ahd_save_modes(ahd);
      ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
      last_phase = ahd_inb(ahd, LASTPHASE);
      saved_scbptr = ahd_get_scbptr(ahd);
      active_scbptr = saved_scbptr;
      if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
            struct scb *bus_scb;

            bus_scb = ahd_lookup_scb(ahd, active_scbptr);
            if (bus_scb == pending_scb)
                  disconnected = FALSE;
      }

      /*
       * At this point, pending_scb is the scb associated with the
       * passed in command.  That command is currently active on the
       * bus or is in the disconnected state.
       */
      saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
      if (last_phase != P_BUSFREE
          && SCB_GET_TAG(pending_scb) == active_scbptr) {

            /*
             * We're active on the bus, so assert ATN
             * and hope that the target responds.
             */
            pending_scb = ahd_lookup_scb(ahd, active_scbptr);
            pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
            ahd_outb(ahd, MSG_OUT, HOST_MSG);
            ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
            scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
            wait = TRUE;
      } else if (disconnected) {

            /*
             * Actually re-queue this SCB in an attempt
             * to select the device before it reconnects.
             */
            pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
            ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
            pending_scb->hscb->cdb_len = 0;
            pending_scb->hscb->task_attribute = 0;
            pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;

            if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
                  /*
                   * Mark the SCB has having an outstanding
                   * task management function.  Should the command
                   * complete normally before the task management
                   * function can be sent, the host will be notified
                   * to abort our requeued SCB.
                   */
                  ahd_outb(ahd, SCB_TASK_MANAGEMENT,
                         pending_scb->hscb->task_management);
            } else {
                  /*
                   * If non-packetized, set the MK_MESSAGE control
                   * bit indicating that we desire to send a message.
                   * We also set the disconnected flag since there is
                   * no guarantee that our SCB control byte matches
                   * the version on the card.  We don't want the
                   * sequencer to abort the command thinking an
                   * unsolicited reselection occurred.
                   */
                  pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;

                  /*
                   * The sequencer will never re-reference the
                   * in-core SCB.  To make sure we are notified
                   * during reslection, set the MK_MESSAGE flag in
                   * the card's copy of the SCB.
                   */
                  ahd_outb(ahd, SCB_CONTROL,
                         ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
            }

            /*
             * Clear out any entries in the QINFIFO first
             * so we are the next SCB for this target
             * to run.
             */
            ahd_search_qinfifo(ahd, cmd->device->id,
                           cmd->device->channel + 'A', cmd->device->lun,
                           SCB_LIST_NULL, ROLE_INITIATOR,
                           CAM_REQUEUE_REQ, SEARCH_COMPLETE);
            ahd_qinfifo_requeue_tail(ahd, pending_scb);
            ahd_set_scbptr(ahd, saved_scbptr);
            ahd_print_path(ahd, pending_scb);
            printf("Device is disconnected, re-queuing SCB\n");
            wait = TRUE;
      } else {
            scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
            retval = FAILED;
            goto done;
      }

no_cmd:
      /*
       * Our assumption is that if we don't have the command, no
       * recovery action was required, so we return success.  Again,
       * the semantics of the mid-layer recovery engine are not
       * well defined, so this may change in time.
       */
      retval = SUCCESS;
done:
      if (paused)
            ahd_unpause(ahd);
      if (wait) {
            DECLARE_COMPLETION(done);

            ahd->platform_data->eh_done = &done;
            ahd_unlock(ahd, &flags);

            printf("%s: Recovery code sleeping\n", ahd_name(ahd));
            if (!wait_for_completion_timeout(&done, 5 * HZ)) {
                  ahd_lock(ahd, &flags);
                  ahd->platform_data->eh_done = NULL;
                  ahd_unlock(ahd, &flags);
                  printf("%s: Timer Expired (active %d)\n",
                         ahd_name(ahd), dev->active);
                  retval = FAILED;
            }
            printf("Recovery code awake\n");
      } else
            ahd_unlock(ahd, &flags);

      if (retval != SUCCESS)
            printf("%s: Command abort returning 0x%x\n",
                   ahd_name(ahd), retval);

      return retval;
}

static void ahd_linux_set_width(struct scsi_target *starget, int width)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_devinfo devinfo;
      unsigned long flags;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_lock(ahd, &flags);
      ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_period(struct scsi_target *starget, int period)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options;
      unsigned int dt;
      unsigned long flags;
      unsigned long offset = tinfo->goal.offset;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: set period to %d\n", ahd_name(ahd), period);
#endif
      if (offset == 0)
            offset = MAX_OFFSET;

      if (period < 8)
            period = 8;
      if (period < 10) {
            ppr_options |= MSG_EXT_PPR_DT_REQ;
            if (period == 8)
                  ppr_options |= MSG_EXT_PPR_IU_REQ;
      }

      dt = ppr_options & MSG_EXT_PPR_DT_REQ;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);

      /* all PPR requests apart from QAS require wide transfers */
      if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
            if (spi_width(starget) == 0)
                  ppr_options &= MSG_EXT_PPR_QAS_REQ;
      }

      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = 0;
      unsigned int period = 0;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: set offset to %d\n", ahd_name(ahd), offset);
#endif

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      if (offset != 0) {
            period = tinfo->goal.period;
            ppr_options = tinfo->goal.ppr_options;
            ahd_find_syncrate(ahd, &period, &ppr_options, 
                          dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
      }

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
                   AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_DT_REQ;
      unsigned int period = tinfo->goal.period;
      unsigned int width = tinfo->goal.width;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s DT\n", ahd_name(ahd), 
                   dt ? "enabling" : "disabling");
#endif
      if (dt) {
            ppr_options |= MSG_EXT_PPR_DT_REQ;
            if (!width)
                  ahd_linux_set_width(starget, 1);
      } else {
            if (period <= 9)
                  period = 10; /* If resetting DT, period must be >= 25ns */
            /* IU is invalid without DT set */
            ppr_options &= ~MSG_EXT_PPR_IU_REQ;
      }
      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_QAS_REQ;
      unsigned int period = tinfo->goal.period;
      unsigned int dt;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s QAS\n", ahd_name(ahd), 
                   qas ? "enabling" : "disabling");
#endif

      if (qas) {
            ppr_options |= MSG_EXT_PPR_QAS_REQ; 
      }

      dt = ppr_options & MSG_EXT_PPR_DT_REQ;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_IU_REQ;
      unsigned int period = tinfo->goal.period;
      unsigned int dt;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s IU\n", ahd_name(ahd),
                   iu ? "enabling" : "disabling");
#endif

      if (iu) {
            ppr_options |= MSG_EXT_PPR_IU_REQ;
            ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
      }

      dt = ppr_options & MSG_EXT_PPR_DT_REQ;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_RD_STRM;
      unsigned int period = tinfo->goal.period;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s Read Streaming\n", ahd_name(ahd), 
                   rdstrm  ? "enabling" : "disabling");
#endif

      if (rdstrm)
            ppr_options |= MSG_EXT_PPR_RD_STRM;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_WR_FLOW;
      unsigned int period = tinfo->goal.period;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s Write Flow Control\n", ahd_name(ahd),
                   wrflow ? "enabling" : "disabling");
#endif

      if (wrflow)
            ppr_options |= MSG_EXT_PPR_WR_FLOW;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_RTI;
      unsigned int period = tinfo->goal.period;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

      if ((ahd->features & AHD_RTI) == 0) {
#ifdef AHD_DEBUG
            if ((ahd_debug & AHD_SHOW_DV) != 0)
                  printf("%s: RTI not available\n", ahd_name(ahd));
#endif
            return;
      }

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s RTI\n", ahd_name(ahd),
                   rti ? "enabling" : "disabling");
#endif

      if (rti)
            ppr_options |= MSG_EXT_PPR_RTI;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_PCOMP_EN;
      unsigned int period = tinfo->goal.period;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

#ifdef AHD_DEBUG
      if ((ahd_debug & AHD_SHOW_DV) != 0)
            printf("%s: %s Precompensation\n", ahd_name(ahd), 
                   pcomp ? "Enable" : "Disable");
#endif

      if (pcomp)
            ppr_options |= MSG_EXT_PPR_PCOMP_EN;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}

static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
{
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
      struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
      struct ahd_tmode_tstate *tstate;
      struct ahd_initiator_tinfo *tinfo 
            = ahd_fetch_transinfo(ahd,
                              starget->channel + 'A',
                              shost->this_id, starget->id, &tstate);
      struct ahd_devinfo devinfo;
      unsigned int ppr_options = tinfo->goal.ppr_options
            & ~MSG_EXT_PPR_HOLD_MCS;
      unsigned int period = tinfo->goal.period;
      unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
      unsigned long flags;

      if (hold)
            ppr_options |= MSG_EXT_PPR_HOLD_MCS;

      ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                      starget->channel + 'A', ROLE_INITIATOR);
      ahd_find_syncrate(ahd, &period, &ppr_options,
                    dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);

      ahd_lock(ahd, &flags);
      ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
                   ppr_options, AHD_TRANS_GOAL, FALSE);
      ahd_unlock(ahd, &flags);
}



static struct spi_function_template ahd_linux_transport_functions = {
      .set_offset = ahd_linux_set_offset,
      .show_offset      = 1,
      .set_period = ahd_linux_set_period,
      .show_period      = 1,
      .set_width  = ahd_linux_set_width,
      .show_width = 1,
      .set_dt           = ahd_linux_set_dt,
      .show_dt    = 1,
      .set_iu           = ahd_linux_set_iu,
      .show_iu    = 1,
      .set_qas    = ahd_linux_set_qas,
      .show_qas   = 1,
      .set_rd_strm      = ahd_linux_set_rd_strm,
      .show_rd_strm     = 1,
      .set_wr_flow      = ahd_linux_set_wr_flow,
      .show_wr_flow     = 1,
      .set_rti    = ahd_linux_set_rti,
      .show_rti   = 1,
      .set_pcomp_en     = ahd_linux_set_pcomp_en,
      .show_pcomp_en    = 1,
      .set_hold_mcs     = ahd_linux_set_hold_mcs,
      .show_hold_mcs    = 1,
};

static int __init
ahd_linux_init(void)
{
      int   error = 0;

      /*
       * If we've been passed any parameters, process them now.
       */
      if (aic79xx)
            aic79xx_setup(aic79xx);

      ahd_linux_transport_template =
            spi_attach_transport(&ahd_linux_transport_functions);
      if (!ahd_linux_transport_template)
            return -ENODEV;

      scsi_transport_reserve_device(ahd_linux_transport_template,
                              sizeof(struct ahd_linux_device));

      error = ahd_linux_pci_init();
      if (error)
            spi_release_transport(ahd_linux_transport_template);
      return error;
}

static void __exit
ahd_linux_exit(void)
{
      ahd_linux_pci_exit();
      spi_release_transport(ahd_linux_transport_template);
}

module_init(ahd_linux_init);
module_exit(ahd_linux_exit);

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