OSCL-LXR linux-6.0.1/​drivers/​scsi/​aic7xxx/​aic7xxx_osm.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 
 /*
  * Adaptec AIC7xxx device driver for Linux.
  *
  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
  *
  * Copyright (c) 1994 John Aycock
  *   The University of Calgary Department of Computer Science.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; see the file COPYING.  If not, write to
  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  * ANSI SCSI-2 specification (draft 10c), ...
  *
  * --------------------------------------------------------------------------
  *
  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  *
  *  Substantially modified to include support for wide and twin bus
  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  *  SCB paging, and other rework of the code.
  *
  * --------------------------------------------------------------------------
  * Copyright (c) 1994-2000 Justin T. Gibbs.
  * Copyright (c) 2000-2001 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.
  *
  *---------------------------------------------------------------------------
  *
  *  Thanks also go to (in alphabetical order) the following:
  *
  *    Rory Bolt     - Sequencer bug fixes
  *    Jay Estabrook - Initial DEC Alpha support
  *    Doug Ledford  - Much needed abort/reset bug fixes
  *    Kai Makisara  - DMAing of SCBs
  *
  *  A Boot time option was also added for not resetting the scsi bus.
  *
  *    Form:  aic7xxx=extended
  *           aic7xxx=no_reset
  *           aic7xxx=verbose
  *
  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  *
  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  */
 
 /*
  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  *
  * Copyright (c) 1997-1999 Doug Ledford
  *
  * These changes are released under the same licensing terms as the FreeBSD
  * driver written by Justin Gibbs.  Please see his Copyright notice above
  * for the exact terms and conditions covering my changes as well as the
  * warranty statement.
  *
  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
  * but are not limited to:
  *
  *  1: Import of the latest FreeBSD sequencer code for this driver
  *  2: Modification of kernel code to accommodate different sequencer semantics
  *  3: Extensive changes throughout kernel portion of driver to improve
  *     abort/reset processing and error hanndling
  *  4: Other work contributed by various people on the Internet
  *  5: Changes to printk information and verbosity selection code
  *  6: General reliability related changes, especially in IRQ management
  *  7: Modifications to the default probe/attach order for supported cards
  *  8: SMP friendliness has been improved
  *
  */
 
 #include "aic7xxx_osm.h"
 #include "aic7xxx_inline.h"
 #include <scsi/scsicam.h>
 
 static struct scsi_transport_template *ahc_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/slab.h>
 
 
 /*
  * 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_AIC7XXX_RESET_DELAY_MS
 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 #else
 #define AIC7XXX_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="aic7xxx=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 {
     uint8_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 aic7xxx 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 aic7xxx_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_AIC7XXX_CMDS_PER_DEVICE
 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 #else
 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 #endif
 
 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                 \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,       \
     AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE        \
 }
 
 /*
  * By default, use the number of commands specified by
  * the users kernel configuration.
  */
 static adapter_tag_info_t aic7xxx_tag_info[] =
 {
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS},
     {AIC7XXX_CONFIGED_TAG_COMMANDS}
 };
 
 /*
  * 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
 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 {
     printk("(scsi%d:%c:%d:%d): ",
            ahc->platform_data->host->host_no,
            scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
            scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
            scb != NULL ? SCB_GET_LUN(scb) : -1);
 }
 
 /*
  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
  *       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 aic7xxx_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 aic7xxx_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 where stray PCI transactions with bad parity are
  * the norm rather than the exception, the error messages can be overwhelming.
  * It's included in the driver for completeness.
  *   0     = Shut off PCI parity check
  *   non-0 = reverse polarity pci parity checking
  */
 static uint32_t aic7xxx_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 aic7xxx_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 aic7xxx_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.
  */
 static uint32_t aic7xxx_periodic_otag;
 
 /*
  * Module information and settable options.
  */
 static char *aic7xxx = NULL;
 
 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 module_param(aic7xxx, charp, 0444);
 MODULE_PARM_DESC(aic7xxx,
 "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_probe        Toggle EISA/VLB controller probing\n"
 "   probe_eisa_vl       Toggle EISA/VLB controller probing\n"
 "   no_reset        Suppress 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"
 "               drives or RAID arrays.\n"
 "   tag_info:<tag_str>  Set per-target tag depth\n"
 "   global_tag_depth:<int>  Global tag depth for every target\n"
 "               on every bus\n"
 "   seltime:<int>       Selection Timeout\n"
 "               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 "\n"
 "   Sample modprobe configuration file:\n"
 "   #   Toggle EISA/VLB probing\n"
 "   #   Set tag depth on Controller 1/Target 1 to 10 tags\n"
 "   #   Shorten the selection timeout to 128ms\n"
 "\n"
 "   options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 );
 
 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
                      struct scsi_device *,
                      struct scb *);
 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
                      struct scsi_cmnd *cmd);
 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
                      struct ahc_devinfo *devinfo);
 static void ahc_linux_device_queue_depth(struct scsi_device *);
 static int ahc_linux_run_command(struct ahc_softc*,
                  struct ahc_linux_device *,
                  struct scsi_cmnd *);
 static void ahc_linux_setup_tag_info_global(char *p);
 static int  aic7xxx_setup(char *s);
 
 static int ahc_linux_unit;
 
 
 /************************** OS Utility Wrappers *******************************/
 void
 ahc_delay(long usec)
 {
     /*
      * udelay on Linux can have problems for
      * multi-millisecond waits.  Wait at most
      * 1024us per call.
      */
     while (usec > 0) {
         udelay(usec % 1024);
         usec -= 1024;
     }
 }
 
 /***************************** Low Level I/O **********************************/
 uint8_t
 ahc_inb(struct ahc_softc * ahc, long port)
 {
     uint8_t x;
 
     if (ahc->tag == BUS_SPACE_MEMIO) {
         x = readb(ahc->bsh.maddr + port);
     } else {
         x = inb(ahc->bsh.ioport + port);
     }
     mb();
     return (x);
 }
 
 void
 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 {
     if (ahc->tag == BUS_SPACE_MEMIO) {
         writeb(val, ahc->bsh.maddr + port);
     } else {
         outb(val, ahc->bsh.ioport + port);
     }
     mb();
 }
 
 void
 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 {
     int i;
 
     /*
      * There is probably a more efficient way to do this on Linux
      * but we don't use this for anything speed critical and this
      * should work.
      */
     for (i = 0; i < count; i++)
         ahc_outb(ahc, port, *array++);
 }
 
 void
 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 {
     int i;
 
     /*
      * There is probably a more efficient way to do this on Linux
      * but we don't use this for anything speed critical and this
      * should work.
      */
     for (i = 0; i < count; i++)
         *array++ = ahc_inb(ahc, port);
 }
 
 /********************************* Inlines ************************************/
 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 
 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
                       struct ahc_dma_seg *sg,
                       dma_addr_t addr, bus_size_t len);
 
 static void
 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 {
     struct scsi_cmnd *cmd;
 
     cmd = scb->io_ctx;
     ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 
     scsi_dma_unmap(cmd);
 }
 
 static int
 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
           struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 {
     int  consumed;
 
     if ((scb->sg_count + 1) > AHC_NSEG)
         panic("Too few segs for dma mapping.  "
               "Increase AHC_NSEG\n");
 
     consumed = 1;
     sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
     scb->platform_data->xfer_len += len;
 
     if (sizeof(dma_addr_t) > 4
      && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
         len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 
     sg->len = ahc_htole32(len);
     return (consumed);
 }
 
 /*
  * Return a string describing the driver.
  */
 static const char *
 ahc_linux_info(struct Scsi_Host *host)
 {
     static char buffer[512];
     char    ahc_info[256];
     char   *bp;
     struct ahc_softc *ahc;
 
     bp = &buffer[0];
     ahc = *(struct ahc_softc **)host->hostdata;
     memset(bp, 0, sizeof(buffer));
     strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
             "        <");
     strcat(bp, ahc->description);
     strcat(bp, ">\n"
             "        ");
     ahc_controller_info(ahc, ahc_info);
     strcat(bp, ahc_info);
     strcat(bp, "\n");
 
     return (bp);
 }
 
 /*
  * Queue an SCB to the controller.
  */
 static int ahc_linux_queue_lck(struct scsi_cmnd *cmd)
 {
     struct   ahc_softc *ahc;
     struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
     int rtn = SCSI_MLQUEUE_HOST_BUSY;
     unsigned long flags;
 
     ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 
     ahc_lock(ahc, &flags);
     if (ahc->platform_data->qfrozen == 0) {
         cmd->result = CAM_REQ_INPROG << 16;
         rtn = ahc_linux_run_command(ahc, dev, cmd);
     }
     ahc_unlock(ahc, &flags);
 
     return rtn;
 }
 
 static DEF_SCSI_QCMD(ahc_linux_queue)
 
 static inline struct scsi_target **
 ahc_linux_target_in_softc(struct scsi_target *starget)
 {
     struct  ahc_softc *ahc =
         *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
     unsigned int target_offset;
 
     target_offset = starget->id;
     if (starget->channel != 0)
         target_offset += 8;
 
     return &ahc->platform_data->starget[target_offset];
 }
 
 static int
 ahc_linux_target_alloc(struct scsi_target *starget)
 {
     struct  ahc_softc *ahc =
         *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
     struct seeprom_config *sc = ahc->seep_config;
     unsigned long flags;
     struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
     unsigned short scsirate;
     struct ahc_devinfo devinfo;
     char channel = starget->channel + 'A';
     unsigned int our_id = ahc->our_id;
     unsigned int target_offset;
 
     target_offset = starget->id;
     if (starget->channel != 0)
         target_offset += 8;
 
     if (starget->channel)
         our_id = ahc->our_id_b;
 
     ahc_lock(ahc, &flags);
 
     BUG_ON(*ahc_targp != NULL);
 
     *ahc_targp = starget;
 
     if (sc) {
         int maxsync = AHC_SYNCRATE_DT;
         int ultra = 0;
         int flags = sc->device_flags[target_offset];
 
         if (ahc->flags & AHC_NEWEEPROM_FMT) {
             if (flags & CFSYNCHISULTRA)
             ultra = 1;
         } else if (flags & CFULTRAEN)
             ultra = 1;
         /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
          * change it to ultra=0, CFXFER = 0 */
         if(ultra && (flags & CFXFER) == 0x04) {
             ultra = 0;
             flags &= ~CFXFER;
         }
 
         if ((ahc->features & AHC_ULTRA2) != 0) {
             scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
         } else {
             scsirate = (flags & CFXFER) << 4;
             maxsync = ultra ? AHC_SYNCRATE_ULTRA :
                 AHC_SYNCRATE_FAST;
         }
         spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
         if (!(flags & CFSYNCH))
             spi_max_offset(starget) = 0;
         spi_min_period(starget) =
             ahc_find_period(ahc, scsirate, maxsync);
     }
     ahc_compile_devinfo(&devinfo, our_id, starget->id,
                 CAM_LUN_WILDCARD, channel,
                 ROLE_INITIATOR);
     ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
              AHC_TRANS_GOAL, /*paused*/FALSE);
     ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
               AHC_TRANS_GOAL, /*paused*/FALSE);
     ahc_unlock(ahc, &flags);
 
     return 0;
 }
 
 static void
 ahc_linux_target_destroy(struct scsi_target *starget)
 {
     struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 
     *ahc_targp = NULL;
 }
 
 static int
 ahc_linux_slave_alloc(struct scsi_device *sdev)
 {
     struct  ahc_softc *ahc =
         *((struct ahc_softc **)sdev->host->hostdata);
     struct scsi_target *starget = sdev->sdev_target;
     struct ahc_linux_device *dev;
 
     if (bootverbose)
         printk("%s: Slave Alloc %d\n", ahc_name(ahc), 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;
 
     spi_period(starget) = 0;
 
     return 0;
 }
 
 static int
 ahc_linux_slave_configure(struct scsi_device *sdev)
 {
     if (bootverbose)
         sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 
     ahc_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
 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
             sector_t capacity, int geom[])
 {
     int  heads;
     int  sectors;
     int  cylinders;
     int  extended;
     struct   ahc_softc *ahc;
     u_int    channel;
 
     ahc = *((struct ahc_softc **)sdev->host->hostdata);
     channel = sdev_channel(sdev);
 
     if (scsi_partsize(bdev, capacity, geom))
         return 0;
 
     heads = 64;
     sectors = 32;
     cylinders = aic_sector_div(capacity, heads, sectors);
 
     if (aic7xxx_extended != 0)
         extended = 1;
     else if (channel == 0)
         extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
     else
         extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 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
 ahc_linux_abort(struct scsi_cmnd *cmd)
 {
     int error;
 
     error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
     if (error != SUCCESS)
         printk("aic7xxx_abort returns 0x%x\n", error);
     return (error);
 }
 
 /*
  * Attempt to send a target reset message to the device that timed out.
  */
 static int
 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 {
     int error;
 
     error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
     if (error != SUCCESS)
         printk("aic7xxx_dev_reset returns 0x%x\n", error);
     return (error);
 }
 
 /*
  * Reset the SCSI bus.
  */
 static int
 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 {
     struct ahc_softc *ahc;
     int    found;
     unsigned long flags;
 
     ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 
     ahc_lock(ahc, &flags);
     found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
                   /*initiate reset*/TRUE);
     ahc_unlock(ahc, &flags);
 
     if (bootverbose)
         printk("%s: SCSI bus reset delivered. "
                "%d SCBs aborted.\n", ahc_name(ahc), found);
 
     return SUCCESS;
 }
 
 struct scsi_host_template aic7xxx_driver_template = {
     .module         = THIS_MODULE,
     .name           = "aic7xxx",
     .proc_name      = "aic7xxx",
     .show_info      = ahc_linux_show_info,
     .write_info     = ahc_proc_write_seeprom,
     .info           = ahc_linux_info,
     .queuecommand       = ahc_linux_queue,
     .eh_abort_handler   = ahc_linux_abort,
     .eh_device_reset_handler = ahc_linux_dev_reset,
     .eh_bus_reset_handler   = ahc_linux_bus_reset,
 #if defined(__i386__)
     .bios_param     = ahc_linux_biosparam,
 #endif
     .can_queue      = AHC_MAX_QUEUE,
     .this_id        = -1,
     .max_sectors        = 8192,
     .cmd_per_lun        = 2,
     .slave_alloc        = ahc_linux_slave_alloc,
     .slave_configure    = ahc_linux_slave_configure,
     .target_alloc       = ahc_linux_target_alloc,
     .target_destroy     = ahc_linux_target_destroy,
 };
 
 /**************************** Tasklet Handler *********************************/
 
 /******************************** Macros **************************************/
 #define BUILD_SCSIID(ahc, cmd)                          \
     ((((cmd)->device->id << TID_SHIFT) & TID)               \
     | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
     | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 
 /******************************** Bus DMA *************************************/
 int
 ahc_dma_tag_create(struct ahc_softc *ahc, 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 = kmalloc(sizeof(*dmat), GFP_ATOMIC);
     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
 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 {
     kfree(dmat);
 }
 
 int
 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
          int flags, bus_dmamap_t *mapp)
 {
     /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
     *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
     if (*vaddr == NULL)
         return ENOMEM;
     return 0;
 }
 
 void
 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
         void* vaddr, bus_dmamap_t map)
 {
     dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 }
 
 int
 ahc_dmamap_load(struct ahc_softc *ahc, 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
 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 {
 }
 
 int
 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 {
     /* Nothing to do */
     return (0);
 }
 
 static void
 ahc_linux_setup_tag_info_global(char *p)
 {
     int tags, i, j;
 
     tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
     printk("Setting Global Tags= %d\n", tags);
 
     for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
         for (j = 0; j < AHC_NUM_TARGETS; j++) {
             aic7xxx_tag_info[i].tag_commands[j] = tags;
         }
     }
 }
 
 static void
 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 {
 
     if ((instance >= 0) && (targ >= 0)
      && (instance < ARRAY_SIZE(aic7xxx_tag_info))
      && (targ < AHC_NUM_TARGETS)) {
         aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
         if (bootverbose)
             printk("tag_info[%d:%d] = %d\n", instance, targ, value);
     }
 }
 
 static char *
 ahc_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 {
                     printk("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. aic7xxx=stpwlev:1,extended
  */
 static int
 aic7xxx_setup(char *s)
 {
     int i, n;
     char   *p;
     char   *end;
 
     static const struct {
         const char *name;
         uint32_t *flag;
     } options[] = {
         { "extended", &aic7xxx_extended },
         { "no_reset", &aic7xxx_no_reset },
         { "verbose", &aic7xxx_verbose },
         { "allow_memio", &aic7xxx_allow_memio},
 #ifdef AHC_DEBUG
         { "debug", &ahc_debug },
 #endif
         { "periodic_otag", &aic7xxx_periodic_otag },
         { "pci_parity", &aic7xxx_pci_parity },
         { "seltime", &aic7xxx_seltime },
         { "tag_info", NULL },
         { "global_tag_depth", NULL },
         { "dv", NULL }
     };
 
     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) {
             ahc_linux_setup_tag_info_global(p + n);
         } else if (strncmp(p, "tag_info", n) == 0) {
             s = ahc_parse_brace_option("tag_info", p + n, end,
                 2, ahc_linux_setup_tag_info, 0);
         } else if (p[n] == ':') {
             *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
         } else if (strncmp(p, "verbose", n) == 0) {
             *(options[i].flag) = 1;
         } else {
             *(options[i].flag) ^= 0xFFFFFFFF;
         }
     }
     return 1;
 }
 
 __setup("aic7xxx=", aic7xxx_setup);
 
 uint32_t aic7xxx_verbose;
 
 int
 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
 {
     char    buf[80];
     struct  Scsi_Host *host;
     char    *new_name;
     u_long  s;
     int retval;
 
     template->name = ahc->description;
     host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
     if (host == NULL)
         return (ENOMEM);
 
     *((struct ahc_softc **)host->hostdata) = ahc;
     ahc->platform_data->host = host;
     host->can_queue = AHC_MAX_QUEUE;
     host->cmd_per_lun = 2;
     /* XXX No way to communicate the ID for multiple channels */
     host->this_id = ahc->our_id;
     host->irq = ahc->platform_data->irq;
     host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
     host->max_lun = AHC_NUM_LUNS;
     host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
     host->sg_tablesize = AHC_NSEG;
     ahc_lock(ahc, &s);
     ahc_set_unit(ahc, ahc_linux_unit++);
     ahc_unlock(ahc, &s);
     sprintf(buf, "scsi%d", host->host_no);
     new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
     if (new_name != NULL) {
         strcpy(new_name, buf);
         ahc_set_name(ahc, new_name);
     }
     host->unique_id = ahc->unit;
     ahc_linux_initialize_scsi_bus(ahc);
     ahc_intr_enable(ahc, TRUE);
 
     host->transportt = ahc_linux_transport_template;
 
     retval = scsi_add_host(host, ahc->dev);
     if (retval) {
         printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
         scsi_host_put(host);
         return retval;
     }
 
     scsi_scan_host(host);
     return 0;
 }
 
 /*
  * 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
 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
 {
     int i;
     int numtarg;
     unsigned long s;
 
     i = 0;
     numtarg = 0;
 
     ahc_lock(ahc, &s);
 
     if (aic7xxx_no_reset != 0)
         ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
 
     if ((ahc->flags & AHC_RESET_BUS_A) != 0)
         ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
     else
         numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
 
     if ((ahc->features & AHC_TWIN) != 0) {
 
         if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
             ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
         } else {
             if (numtarg == 0)
                 i = 8;
             numtarg += 8;
         }
     }
 
     /*
      * Force negotiation to async for all targets that
      * will not see an initial bus reset.
      */
     for (; i < numtarg; i++) {
         struct ahc_devinfo devinfo;
         struct ahc_initiator_tinfo *tinfo;
         struct ahc_tmode_tstate *tstate;
         u_int our_id;
         u_int target_id;
         char channel;
 
         channel = 'A';
         our_id = ahc->our_id;
         target_id = i;
         if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
             channel = 'B';
             our_id = ahc->our_id_b;
             target_id = i % 8;
         }
         tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
                         target_id, &tstate);
         ahc_compile_devinfo(&devinfo, our_id, target_id,
                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
         ahc_update_neg_request(ahc, &devinfo, tstate,
                        tinfo, AHC_NEG_ALWAYS);
     }
     ahc_unlock(ahc, &s);
     /* Give the bus some time to recover */
     if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
         ahc_linux_freeze_simq(ahc);
         msleep(AIC7XXX_RESET_DELAY);
         ahc_linux_release_simq(ahc);
     }
 }
 
 int
 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
 {
 
     ahc->platform_data =
         kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
     if (ahc->platform_data == NULL)
         return (ENOMEM);
     ahc->platform_data->irq = AHC_LINUX_NOIRQ;
     ahc_lockinit(ahc);
     ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
     ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
     if (aic7xxx_pci_parity == 0)
         ahc->flags |= AHC_DISABLE_PCI_PERR;
 
     return (0);
 }
 
 void
 ahc_platform_free(struct ahc_softc *ahc)
 {
     struct scsi_target *starget;
     int i;
 
     if (ahc->platform_data != NULL) {
         /* destroy all of the device and target objects */
         for (i = 0; i < AHC_NUM_TARGETS; i++) {
             starget = ahc->platform_data->starget[i];
             if (starget != NULL) {
                 ahc->platform_data->starget[i] = NULL;
             }
         }
 
         if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
             free_irq(ahc->platform_data->irq, ahc);
         if (ahc->tag == BUS_SPACE_PIO
          && ahc->bsh.ioport != 0)
             release_region(ahc->bsh.ioport, 256);
         if (ahc->tag == BUS_SPACE_MEMIO
          && ahc->bsh.maddr != NULL) {
             iounmap(ahc->bsh.maddr);
             release_mem_region(ahc->platform_data->mem_busaddr,
                        0x1000);
         }
 
         if (ahc->platform_data->host)
             scsi_host_put(ahc->platform_data->host);
 
         kfree(ahc->platform_data);
     }
 }
 
 void
 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
 {
     ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
                 SCB_GET_CHANNEL(ahc, scb),
                 SCB_GET_LUN(scb), SCB_LIST_NULL,
                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
 }
 
 void
 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
               struct ahc_devinfo *devinfo, ahc_queue_alg alg)
 {
     struct ahc_linux_device *dev;
     int was_queuing;
     int now_queuing;
 
     if (sdev == NULL)
         return;
     dev = scsi_transport_device_data(sdev);
 
     was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
     switch (alg) {
     default:
     case AHC_QUEUE_NONE:
         now_queuing = 0;
         break;
     case AHC_QUEUE_BASIC:
         now_queuing = AHC_DEV_Q_BASIC;
         break;
     case AHC_QUEUE_TAGGED:
         now_queuing = AHC_DEV_Q_TAGGED;
         break;
     }
     if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
      && (was_queuing != now_queuing)
      && (dev->active != 0)) {
         dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
         dev->qfrozen++;
     }
 
     dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
     if (now_queuing) {
         u_int usertags;
 
         usertags = ahc_linux_user_tagdepth(ahc, devinfo);
         if (!was_queuing) {
             /*
              * Start out aggressively 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 == AHC_QUEUE_TAGGED) {
             dev->flags |= AHC_DEV_Q_TAGGED;
             if (aic7xxx_periodic_otag != 0)
                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
         } else
             dev->flags |= AHC_DEV_Q_BASIC;
     } else {
         /* We can only have one opening. */
         dev->maxtags = 0;
         dev->openings =  1 - dev->active;
     }
     switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
     case AHC_DEV_Q_BASIC:
     case AHC_DEV_Q_TAGGED:
         scsi_change_queue_depth(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_change_queue_depth(sdev, 2);
         break;
     }
 }
 
 int
 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
             int lun, u_int tag, role_t role, uint32_t status)
 {
     return 0;
 }
 
 static u_int
 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
 {
     static int warned_user;
     u_int tags;
 
     tags = 0;
     if ((ahc->user_discenable & devinfo->target_mask) != 0) {
         if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
             if (warned_user == 0) {
 
                 printk(KERN_WARNING
 "aic7xxx: WARNING: Insufficient tag_info instances\n"
 "aic7xxx: for installed controllers. Using defaults\n"
 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
 "aic7xxx: the aic7xxx_osm..c source file.\n");
                 warned_user++;
             }
             tags = AHC_MAX_QUEUE;
         } else {
             adapter_tag_info_t *tag_info;
 
             tag_info = &aic7xxx_tag_info[ahc->unit];
             tags = tag_info->tag_commands[devinfo->target_offset];
             if (tags > AHC_MAX_QUEUE)
                 tags = AHC_MAX_QUEUE;
         }
     }
     return (tags);
 }
 
 /*
  * Determines the queue depth for a given device.
  */
 static void
 ahc_linux_device_queue_depth(struct scsi_device *sdev)
 {
     struct  ahc_devinfo devinfo;
     u_int   tags;
     struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
 
     ahc_compile_devinfo(&devinfo,
                 sdev->sdev_target->channel == 0
               ? ahc->our_id : ahc->our_id_b,
                 sdev->sdev_target->id, sdev->lun,
                 sdev->sdev_target->channel == 0 ? 'A' : 'B',
                 ROLE_INITIATOR);
     tags = ahc_linux_user_tagdepth(ahc, &devinfo);
     if (tags != 0 && sdev->tagged_supported != 0) {
 
         ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
         ahc_send_async(ahc, devinfo.channel, devinfo.target,
                    devinfo.lun, AC_TRANSFER_NEG);
         ahc_print_devinfo(ahc, &devinfo);
         printk("Tagged Queuing enabled.  Depth %d\n", tags);
     } else {
         ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
         ahc_send_async(ahc, devinfo.channel, devinfo.target,
                    devinfo.lun, AC_TRANSFER_NEG);
     }
 }
 
 static int
 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
               struct scsi_cmnd *cmd)
 {
     struct   scb *scb;
     struct   hardware_scb *hscb;
     struct   ahc_initiator_tinfo *tinfo;
     struct   ahc_tmode_tstate *tstate;
     uint16_t mask;
     struct scb_tailq *untagged_q = NULL;
     int nseg;
 
     /*
      * Schedule us to run later.  The only reason we are not
      * running is because the whole controller Q is frozen.
      */
     if (ahc->platform_data->qfrozen != 0)
         return SCSI_MLQUEUE_HOST_BUSY;
 
     /*
      * We only allow one untagged transaction
      * per target in the initiator role unless
      * we are storing a full busy target *lun*
      * table in SCB space.
      */
     if (!(cmd->flags & SCMD_TAGGED)
         && (ahc->features & AHC_SCB_BTT) == 0) {
         int target_offset;
 
         target_offset = cmd->device->id + cmd->device->channel * 8;
         untagged_q = &(ahc->untagged_queues[target_offset]);
         if (!TAILQ_EMPTY(untagged_q))
             /* if we're already executing an untagged command
              * we're busy to another */
             return SCSI_MLQUEUE_DEVICE_BUSY;
     }
 
     nseg = scsi_dma_map(cmd);
     if (nseg < 0)
         return SCSI_MLQUEUE_HOST_BUSY;
 
     /*
      * Get an scb to use.
      */
     scb = ahc_get_scb(ahc);
     if (!scb) {
         scsi_dma_unmap(cmd);
         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(ahc, cmd);
     hscb->lun = cmd->device->lun;
     mask = SCB_GET_TARGET_MASK(ahc, scb);
     tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
                     SCB_GET_OUR_ID(scb),
                     SCB_GET_TARGET(ahc, scb), &tstate);
     hscb->scsirate = tinfo->scsirate;
     hscb->scsioffset = tinfo->curr.offset;
     if ((tstate->ultraenb & mask) != 0)
         hscb->control |= ULTRAENB;
 
     if ((ahc->user_discenable & mask) != 0)
         hscb->control |= DISCENB;
 
     if ((tstate->auto_negotiate & mask) != 0) {
         scb->flags |= SCB_AUTO_NEGOTIATE;
         scb->hscb->control |= MK_MESSAGE;
     }
 
     if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
         if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
             hscb->control |= ORDERED_QUEUE_TAG;
             dev->commands_since_idle_or_otag = 0;
         } else {
             hscb->control |= SIMPLE_QUEUE_TAG;
         }
     }
 
     hscb->cdb_len = cmd->cmd_len;
     if (hscb->cdb_len <= 12) {
         memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
     } else {
         memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
         scb->flags |= SCB_CDB32_PTR;
     }
 
     scb->platform_data->xfer_len = 0;
     ahc_set_residual(scb, 0);
     ahc_set_sense_residual(scb, 0);
     scb->sg_count = 0;
 
     if (nseg > 0) {
         struct  ahc_dma_seg *sg;
         struct  scatterlist *cur_seg;
         int i;
 
         /* Copy the segments into the SG list. */
         sg = scb->sg_list;
         /*
          * The sg_count may be larger than nseg if
          * a transfer crosses a 32bit page.
          */
         scsi_for_each_sg(cmd, cur_seg, nseg, i) {
             dma_addr_t addr;
             bus_size_t len;
             int consumed;
 
             addr = sg_dma_address(cur_seg);
             len = sg_dma_len(cur_seg);
             consumed = ahc_linux_map_seg(ahc, scb,
                              sg, addr, len);
             sg += consumed;
             scb->sg_count += consumed;
         }
         sg--;
         sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
 
         /*
          * Reset the sg list pointer.
          */
         scb->hscb->sgptr =
             ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
 
         /*
          * Copy the first SG into the "current"
          * data pointer area.
          */
         scb->hscb->dataptr = scb->sg_list->addr;
         scb->hscb->datacnt = scb->sg_list->len;
     } else {
         scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
         scb->hscb->dataptr = 0;
         scb->hscb->datacnt = 0;
         scb->sg_count = 0;
     }
 
     LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
     dev->openings--;
     dev->active++;
     dev->commands_issued++;
     if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
         dev->commands_since_idle_or_otag++;
 
     scb->flags |= SCB_ACTIVE;
     if (untagged_q) {
         TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
         scb->flags |= SCB_UNTAGGEDQ;
     }
     ahc_queue_scb(ahc, scb);
     return 0;
 }
 
 /*
  * SCSI controller interrupt handler.
  */
 irqreturn_t
 ahc_linux_isr(int irq, void *dev_id)
 {
     struct  ahc_softc *ahc;
     u_long  flags;
     int ours;
 
     ahc = (struct ahc_softc *) dev_id;
     ahc_lock(ahc, &flags);
     ours = ahc_intr(ahc);
     ahc_unlock(ahc, &flags);
     return IRQ_RETVAL(ours);
 }
 
 void
 ahc_platform_flushwork(struct ahc_softc *ahc)
 {
 
 }
 
 void
 ahc_send_async(struct ahc_softc *ahc, char channel,
            u_int target, u_int lun, ac_code code)
 {
     switch (code) {
     case AC_TRANSFER_NEG:
     {
         struct  scsi_target *starget;
         struct  ahc_initiator_tinfo *tinfo;
         struct  ahc_tmode_tstate *tstate;
         int target_offset;
         unsigned int target_ppr_options;
 
         BUG_ON(target == CAM_TARGET_WILDCARD);
 
         tinfo = ahc_fetch_transinfo(ahc, channel,
                         channel == 'A' ? ahc->our_id
                                    : ahc->our_id_b,
                         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.
          */
         target_offset = target;
         if (channel == 'B')
             target_offset += 8;
         starget = ahc->platform_data->starget[target_offset];
         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);
 
         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_display_xfer_agreement(starget);
         break;
     }
     case AC_SENT_BDR:
     {
         WARN_ON(lun != CAM_LUN_WILDCARD);
         scsi_report_device_reset(ahc->platform_data->host,
                      channel - 'A', target);
         break;
     }
     case AC_BUS_RESET:
         if (ahc->platform_data->host != NULL) {
             scsi_report_bus_reset(ahc->platform_data->host,
                           channel - 'A');
         }
         break;
     default:
         panic("ahc_send_async: Unexpected async event");
     }
 }
 
 /*
  * Calls the higher level scsi done function and frees the scb.
  */
 void
 ahc_done(struct ahc_softc *ahc, struct scb *scb)
 {
     struct scsi_cmnd *cmd;
     struct     ahc_linux_device *dev;
 
     LIST_REMOVE(scb, pending_links);
     if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
         struct scb_tailq *untagged_q;
         int target_offset;
 
         target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
         untagged_q = &(ahc->untagged_queues[target_offset]);
         TAILQ_REMOVE(untagged_q, scb, links.tqe);
         BUG_ON(!TAILQ_EMPTY(untagged_q));
     } else if ((scb->flags & SCB_ACTIVE) == 0) {
         /*
          * Transactions aborted from the untagged queue may
          * not have been dispatched to the controller, so
          * only check the SCB_ACTIVE flag for tagged transactions.
          */
         printk("SCB %d done'd twice\n", scb->hscb->tag);
         ahc_dump_card_state(ahc);
         panic("Stopping for safety");
     }
     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--;
     }
     ahc_linux_unmap_scb(ahc, 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 (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
 #ifdef AHC_REPORT_UNDERFLOWS
         uint32_t amount_xferred;
 
         amount_xferred =
             ahc_get_transfer_length(scb) - ahc_get_residual(scb);
 #endif
         if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
 #ifdef AHC_DEBUG
             if ((ahc_debug & AHC_SHOW_MISC) != 0) {
                 ahc_print_path(ahc, scb);
                 printk("Set CAM_UNCOR_PARITY\n");
             }
 #endif
             ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
 #ifdef AHC_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;
 
             ahc_print_path(ahc, scb);
             printk("CDB:");
             for (i = 0; i < scb->io_ctx->cmd_len; i++)
                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
             printk("\n");
             ahc_print_path(ahc, scb);
             printk("Saw underflow (%ld of %ld bytes). "
                    "Treated as error\n",
                 ahc_get_residual(scb),
                 ahc_get_transfer_length(scb));
             ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
 #endif
         } else {
             ahc_set_transaction_status(scb, CAM_REQ_CMP);
         }
     } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
         ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
     }
 
     if (dev->openings == 1
      && ahc_get_transaction_status(scb) == CAM_REQ_CMP
      && ahc_get_scsi_status(scb) != SAM_STAT_TASK_SET_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 > AHC_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) {
         printk("Recovery SCB completes\n");
         if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
          || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
             ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
 
         if (ahc->platform_data->eh_done)
             complete(ahc->platform_data->eh_done);
     }
 
     ahc_free_scb(ahc, scb);
     ahc_linux_queue_cmd_complete(ahc, cmd);
 }
 
 static void
 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
                  struct scsi_device *sdev, struct scb *scb)
 {
     struct  ahc_devinfo devinfo;
     struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
 
     ahc_compile_devinfo(&devinfo,
                 ahc->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 (ahc_get_scsi_status(scb)) {
     default:
         break;
     case SAM_STAT_CHECK_CONDITION:
     case SAM_STAT_COMMAND_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) {
             u_int sense_size;
 
             sense_size = min(sizeof(struct scsi_sense_data)
                        - ahc_get_sense_residual(scb),
                      (u_long)SCSI_SENSE_BUFFERSIZE);
             memcpy(cmd->sense_buffer,
                    ahc_get_sense_buf(ahc, scb), sense_size);
             if (sense_size < SCSI_SENSE_BUFFERSIZE)
                 memset(&cmd->sense_buffer[sense_size], 0,
                        SCSI_SENSE_BUFFERSIZE - sense_size);
 #ifdef AHC_DEBUG
             if (ahc_debug & AHC_SHOW_SENSE) {
                 int i;
 
                 printk("Copied %d bytes of sense data:",
                        sense_size);
                 for (i = 0; i < sense_size; i++) {
                     if ((i & 0xF) == 0)
                         printk("\n");
                     printk("0x%x ", cmd->sense_buffer[i]);
                 }
                 printk("\n");
             }
 #endif
         }
         break;
     }
     case SAM_STAT_TASK_SET_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;
 /*
             ahc_print_path(ahc, scb);
             printk("Dropping tag count to %d\n", dev->active);
  */
             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
                  == AHC_LOCK_TAGS_COUNT) {
                     dev->maxtags = dev->active;
                     ahc_print_path(ahc, scb);
                     printk("Locking max tag count at %d\n",
                            dev->active);
                 }
             } else {
                 dev->tags_on_last_queuefull = dev->active;
                 dev->last_queuefull_same_count = 0;
             }
             ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
             ahc_set_scsi_status(scb, SAM_STAT_GOOD);
             ahc_platform_set_tags(ahc, sdev, &devinfo,
                      (dev->flags & AHC_DEV_Q_BASIC)
                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
             break;
         }
         /*
          * Drop down to a single opening, and treat this
          * as if the target returned BUSY SCSI status.
          */
         dev->openings = 1;
         ahc_set_scsi_status(scb, SAM_STAT_BUSY);
         ahc_platform_set_tags(ahc, sdev, &devinfo,
                  (dev->flags & AHC_DEV_Q_BASIC)
                ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
         break;
     }
     }
 }
 
 static void
 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
 {
     /*
      * 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.
      */
     {
         u_int new_status;
 
         switch (ahc_cmd_get_transaction_status(cmd)) {
         case CAM_REQ_INPROG:
         case CAM_REQ_CMP:
         case CAM_SCSI_STATUS_ERROR:
             new_status = DID_OK;
             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;
             break;
         case CAM_CMD_TIMEOUT:
             new_status = DID_TIME_OUT;
             break;
         case CAM_UA_ABORT:
         case CAM_REQ_CMP_ERR:
         case CAM_AUTOSENSE_FAIL:
         case CAM_NO_HBA:
         case CAM_DATA_RUN_ERR:
         case CAM_UNEXP_BUSFREE:
         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;
         }
 
         ahc_cmd_set_transaction_status(cmd, new_status);
     }
 
     scsi_done(cmd);
 }
 
 static void
 ahc_linux_freeze_simq(struct ahc_softc *ahc)
 {
     unsigned long s;
 
     ahc_lock(ahc, &s);
     ahc->platform_data->qfrozen++;
     if (ahc->platform_data->qfrozen == 1) {
         scsi_block_requests(ahc->platform_data->host);
 
         /* XXX What about Twin channels? */
         ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
                     CAM_LUN_WILDCARD, SCB_LIST_NULL,
                     ROLE_INITIATOR, CAM_REQUEUE_REQ);
     }
     ahc_unlock(ahc, &s);
 }
 
 static void
 ahc_linux_release_simq(struct ahc_softc *ahc)
 {
     u_long s;
     int    unblock_reqs;
 
     unblock_reqs = 0;
     ahc_lock(ahc, &s);
     if (ahc->platform_data->qfrozen > 0)
         ahc->platform_data->qfrozen--;
     if (ahc->platform_data->qfrozen == 0)
         unblock_reqs = 1;
     ahc_unlock(ahc, &s);
     /*
      * There is still a race here.  The mid-layer
      * should keep its own freeze count and use
      * a bottom half handler to run the queues
      * so we can unblock with our own lock held.
      */
     if (unblock_reqs)
         scsi_unblock_requests(ahc->platform_data->host);
 }
 
 static int
 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
 {
     struct ahc_softc *ahc;
     struct ahc_linux_device *dev;
     struct scb *pending_scb;
     u_int  saved_scbptr;
     u_int  active_scb_index;
     u_int  last_phase;
     u_int  saved_scsiid;
     u_int  cdb_byte;
     int    retval;
     int    was_paused;
     int    paused;
     int    wait;
     int    disconnected;
     unsigned long flags;
 
     pending_scb = NULL;
     paused = FALSE;
     wait = FALSE;
     ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 
     scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
            flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
 
     printk("CDB:");
     for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
         printk(" 0x%x", cmd->cmnd[cdb_byte]);
     printk("\n");
 
     ahc_lock(ahc, &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.
          */
         printk("%s:%d:%d:%d: Is not an active device\n",
                ahc_name(ahc), cmd->device->channel, cmd->device->id,
                (u8)cmd->device->lun);
         retval = SUCCESS;
         goto no_cmd;
     }
 
     if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
      && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
                        cmd->device->channel + 'A',
                        (u8)cmd->device->lun,
                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
         printk("%s:%d:%d:%d: Command found on untagged queue\n",
                ahc_name(ahc), cmd->device->channel, cmd->device->id,
                (u8)cmd->device->lun);
         retval = SUCCESS;
         goto done;
     }
 
     /*
      * See if we can find a matching cmd in the pending list.
      */
     LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
         if (pending_scb->io_ctx == cmd)
             break;
     }
 
     if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
 
         /* Any SCB for this device will do for a target reset */
         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
             if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
                       scmd_channel(cmd) + 'A',
                       CAM_LUN_WILDCARD,
                       SCB_LIST_NULL, ROLE_INITIATOR))
                 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 and that we didn't "just" miss
      * an interrupt that would affect this cmd.
      */
     was_paused = ahc_is_paused(ahc);
     ahc_pause_and_flushwork(ahc);
     paused = TRUE;
 
     if ((pending_scb->flags & SCB_ACTIVE) == 0) {
         scmd_printk(KERN_INFO, cmd, "Command already completed\n");
         goto no_cmd;
     }
 
     printk("%s: At time of recovery, card was %spaused\n",
            ahc_name(ahc), was_paused ? "" : "not ");
     ahc_dump_card_state(ahc);
 
     disconnected = TRUE;
     if (flag == SCB_ABORT) {
         if (ahc_search_qinfifo(ahc, cmd->device->id,
                        cmd->device->channel + 'A',
                        cmd->device->lun,
                        pending_scb->hscb->tag,
                        ROLE_INITIATOR, CAM_REQ_ABORTED,
                        SEARCH_COMPLETE) > 0) {
             printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
                    ahc_name(ahc), cmd->device->channel,
                    cmd->device->id, (u8)cmd->device->lun);
             retval = SUCCESS;
             goto done;
         }
     } else if (ahc_search_qinfifo(ahc, cmd->device->id,
                       cmd->device->channel + 'A',
                       cmd->device->lun,
                       pending_scb->hscb->tag,
                       ROLE_INITIATOR, /*status*/0,
                       SEARCH_COUNT) > 0) {
         disconnected = FALSE;
     }
 
     if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
         struct scb *bus_scb;
 
         bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
         if (bus_scb == pending_scb)
             disconnected = FALSE;
         else if (flag != SCB_ABORT
               && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
               && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(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, is in the disconnected state, or we're hoping to find
      * a command for the same target active on the bus to abuse to
      * send a BDR.  Queue the appropriate message based on which of
      * these states we are in.
      */
     last_phase = ahc_inb(ahc, LASTPHASE);
     saved_scbptr = ahc_inb(ahc, SCBPTR);
     active_scb_index = ahc_inb(ahc, SCB_TAG);
     saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
     if (last_phase != P_BUSFREE
      && (pending_scb->hscb->tag == active_scb_index
       || (flag == SCB_DEVICE_RESET
        && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
 
         /*
          * We're active on the bus, so assert ATN
          * and hope that the target responds.
          */
         pending_scb = ahc_lookup_scb(ahc, active_scb_index);
         pending_scb->flags |= SCB_RECOVERY_SCB|flag;
         ahc_outb(ahc, MSG_OUT, HOST_MSG);
         ahc_outb(ahc, 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.
          * In either case (selection or reselection),
          * we will now issue the approprate message
          * to the timed-out device.
          *
          * Set the MK_MESSAGE control bit indicating
          * that we desire to send a message.  We
          * also set the disconnected flag since
          * in the paging case 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;
         pending_scb->flags |= SCB_RECOVERY_SCB|flag;
 
         /*
          * Remove any cached copy of this SCB in the
          * disconnected list in preparation for the
          * queuing of our abort SCB.  We use the
          * same element in the SCB, SCB_NEXT, for
          * both the qinfifo and the disconnected list.
          */
         ahc_search_disc_list(ahc, cmd->device->id,
                      cmd->device->channel + 'A',
                      cmd->device->lun, pending_scb->hscb->tag,
                      /*stop_on_first*/TRUE,
                      /*remove*/TRUE,
                      /*save_state*/FALSE);
 
         /*
          * In the non-paging case, the sequencer will
          * never re-reference the in-core SCB.
          * To make sure we are notified during
          * reselection, set the MK_MESSAGE flag in
          * the card's copy of the SCB.
          */
         if ((ahc->flags & AHC_PAGESCBS) == 0) {
             ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
             ahc_outb(ahc, SCB_CONTROL,
                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
         }
 
         /*
          * Clear out any entries in the QINFIFO first
          * so we are the next SCB for this target
          * to run.
          */
         ahc_search_qinfifo(ahc, cmd->device->id,
                    cmd->device->channel + 'A',
                    cmd->device->lun, SCB_LIST_NULL,
                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
                    SEARCH_COMPLETE);
         ahc_qinfifo_requeue_tail(ahc, pending_scb);
         ahc_outb(ahc, SCBPTR, saved_scbptr);
         ahc_print_path(ahc, pending_scb);
         printk("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)
         ahc_unpause(ahc);
     if (wait) {
         DECLARE_COMPLETION_ONSTACK(done);
 
         ahc->platform_data->eh_done = &done;
         ahc_unlock(ahc, &flags);
 
         printk("Recovery code sleeping\n");
         if (!wait_for_completion_timeout(&done, 5 * HZ)) {
             ahc_lock(ahc, &flags);
             ahc->platform_data->eh_done = NULL;
             ahc_unlock(ahc, &flags);
 
             printk("Timer Expired\n");
             retval = FAILED;
         }
         printk("Recovery code awake\n");
     } else
         ahc_unlock(ahc, &flags);
     return (retval);
 }
 
 static void ahc_linux_set_width(struct scsi_target *starget, int width)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_devinfo devinfo;
     unsigned long flags;
 
     ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                 starget->channel + 'A', ROLE_INITIATOR);
     ahc_lock(ahc, &flags);
     ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 
 static void ahc_linux_set_period(struct scsi_target *starget, int period)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_tmode_tstate *tstate;
     struct ahc_initiator_tinfo *tinfo
         = ahc_fetch_transinfo(ahc,
                       starget->channel + 'A',
                       shost->this_id, starget->id, &tstate);
     struct ahc_devinfo devinfo;
     unsigned int ppr_options = tinfo->goal.ppr_options;
     unsigned long flags;
     unsigned long offset = tinfo->goal.offset;
     const struct ahc_syncrate *syncrate;
 
     if (offset == 0)
         offset = MAX_OFFSET;
 
     if (period < 9)
         period = 9; /* 12.5ns is our minimum */
     if (period == 9) {
         if (spi_max_width(starget))
             ppr_options |= MSG_EXT_PPR_DT_REQ;
         else
             /* need wide for DT and need DT for 12.5 ns */
             period = 10;
     }
 
     ahc_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;
     }
 
     syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
                      AHC_SYNCRATE_DT);
     ahc_lock(ahc, &flags);
     ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
              ppr_options, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 
 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_tmode_tstate *tstate;
     struct ahc_initiator_tinfo *tinfo
         = ahc_fetch_transinfo(ahc,
                       starget->channel + 'A',
                       shost->this_id, starget->id, &tstate);
     struct ahc_devinfo devinfo;
     unsigned int ppr_options = 0;
     unsigned int period = 0;
     unsigned long flags;
     const struct ahc_syncrate *syncrate = NULL;
 
     ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                 starget->channel + 'A', ROLE_INITIATOR);
     if (offset != 0) {
         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
                          AHC_SYNCRATE_DT);
         period = tinfo->goal.period;
         ppr_options = tinfo->goal.ppr_options;
     }
     ahc_lock(ahc, &flags);
     ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
              ppr_options, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 
 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_tmode_tstate *tstate;
     struct ahc_initiator_tinfo *tinfo
         = ahc_fetch_transinfo(ahc,
                       starget->channel + 'A',
                       shost->this_id, starget->id, &tstate);
     struct ahc_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;
     const struct ahc_syncrate *syncrate;
 
     if (dt && spi_max_width(starget)) {
         ppr_options |= MSG_EXT_PPR_DT_REQ;
         if (!width)
             ahc_linux_set_width(starget, 1);
     } else if (period == 9)
         period = 10;    /* if resetting DT, period must be >= 25ns */
 
     ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                 starget->channel + 'A', ROLE_INITIATOR);
     syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
                      AHC_SYNCRATE_DT);
     ahc_lock(ahc, &flags);
     ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
              ppr_options, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 
 #if 0
 /* FIXME: This code claims to support IU and QAS.  However, the actual
  * sequencer code and aic7xxx_core have no support for these parameters and
  * will get into a bad state if they're negotiated.  Do not enable this
  * unless you know what you're doing */
 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_tmode_tstate *tstate;
     struct ahc_initiator_tinfo *tinfo
         = ahc_fetch_transinfo(ahc,
                       starget->channel + 'A',
                       shost->this_id, starget->id, &tstate);
     struct ahc_devinfo devinfo;
     unsigned int ppr_options = tinfo->goal.ppr_options
         & ~MSG_EXT_PPR_QAS_REQ;
     unsigned int period = tinfo->goal.period;
     unsigned long flags;
     struct ahc_syncrate *syncrate;
 
     if (qas)
         ppr_options |= MSG_EXT_PPR_QAS_REQ;
 
     ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                 starget->channel + 'A', ROLE_INITIATOR);
     syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
                      AHC_SYNCRATE_DT);
     ahc_lock(ahc, &flags);
     ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
              ppr_options, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 
 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
 {
     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
     struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
     struct ahc_tmode_tstate *tstate;
     struct ahc_initiator_tinfo *tinfo
         = ahc_fetch_transinfo(ahc,
                       starget->channel + 'A',
                       shost->this_id, starget->id, &tstate);
     struct ahc_devinfo devinfo;
     unsigned int ppr_options = tinfo->goal.ppr_options
         & ~MSG_EXT_PPR_IU_REQ;
     unsigned int period = tinfo->goal.period;
     unsigned long flags;
     struct ahc_syncrate *syncrate;
 
     if (iu)
         ppr_options |= MSG_EXT_PPR_IU_REQ;
 
     ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                 starget->channel + 'A', ROLE_INITIATOR);
     syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
                      AHC_SYNCRATE_DT);
     ahc_lock(ahc, &flags);
     ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
              ppr_options, AHC_TRANS_GOAL, FALSE);
     ahc_unlock(ahc, &flags);
 }
 #endif
 
 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
 {
     struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
     unsigned long flags;
     u8 mode;
 
     if (!(ahc->features & AHC_ULTRA2)) {
         /* non-LVD chipset, may not have SBLKCTL reg */
         spi_signalling(shost) =
             ahc->features & AHC_HVD ?
             SPI_SIGNAL_HVD :
             SPI_SIGNAL_SE;
         return;
     }
 
     ahc_lock(ahc, &flags);
     ahc_pause(ahc);
     mode = ahc_inb(ahc, SBLKCTL);
     ahc_unpause(ahc);
     ahc_unlock(ahc, &flags);
 
     if (mode & ENAB40)
         spi_signalling(shost) = SPI_SIGNAL_LVD;
     else if (mode & ENAB20)
         spi_signalling(shost) = SPI_SIGNAL_SE;
     else
         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 }
 
 static struct spi_function_template ahc_linux_transport_functions = {
     .set_offset = ahc_linux_set_offset,
     .show_offset    = 1,
     .set_period = ahc_linux_set_period,
     .show_period    = 1,
     .set_width  = ahc_linux_set_width,
     .show_width = 1,
     .set_dt     = ahc_linux_set_dt,
     .show_dt    = 1,
 #if 0
     .set_iu     = ahc_linux_set_iu,
     .show_iu    = 1,
     .set_qas    = ahc_linux_set_qas,
     .show_qas   = 1,
 #endif
     .get_signalling = ahc_linux_get_signalling,
 };
 
 
 
 static int __init
 ahc_linux_init(void)
 {
     /*
      * If we've been passed any parameters, process them now.
      */
     if (aic7xxx)
         aic7xxx_setup(aic7xxx);
 
     ahc_linux_transport_template =
         spi_attach_transport(&ahc_linux_transport_functions);
     if (!ahc_linux_transport_template)
         return -ENODEV;
 
     scsi_transport_reserve_device(ahc_linux_transport_template,
                       sizeof(struct ahc_linux_device));
 
     ahc_linux_pci_init();
     ahc_linux_eisa_init();
     return 0;
 }
 
 static void
 ahc_linux_exit(void)
 {
     ahc_linux_pci_exit();
     ahc_linux_eisa_exit();
     spi_release_transport(ahc_linux_transport_template);
 }
 
 module_init(ahc_linux_init);
 module_exit(ahc_linux_exit);

This page was automatically generated by the 2.1.0 LXR engine. The LXR team