drivers/scsi/aic7xxx/aic79xx_osm.c

   1 /*
   2  * Adaptec AIC79xx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
   5  *
   6  * --------------------------------------------------------------------------
   7  * Copyright (c) 1994-2000 Justin T. Gibbs.
   8  * Copyright (c) 1997-1999 Doug Ledford
   9  * Copyright (c) 2000-2003 Adaptec Inc.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include "aic79xx_osm.h"
  46 #include "aic79xx_inline.h"
  47 #include <scsi/scsicam.h>
  48
  49 static struct scsi_transport_template *ahd_linux_transport_template = NULL;
  50
  51 #include <linux/init.h>         /* __setup */
  52 #include <linux/mm.h>           /* For fetching system memory size */
  53 #include <linux/blkdev.h>               /* For block_size() */
  54 #include <linux/delay.h>        /* For ssleep/msleep */
  55 #include <linux/device.h>
  56
  57 /*
  58  * Bucket size for counting good commands in between bad ones.
  59  */
  60 #define AHD_LINUX_ERR_THRESH    1000
  61
  62 /*
  63  * Set this to the delay in seconds after SCSI bus reset.
  64  * Note, we honor this only for the initial bus reset.
  65  * The scsi error recovery code performs its own bus settle
  66  * delay handling for error recovery actions.
  67  */
  68 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
  69 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
  70 #else
  71 #define AIC79XX_RESET_DELAY 5000
  72 #endif
  73
  74 /*
  75  * To change the default number of tagged transactions allowed per-device,
  76  * add a line to the lilo.conf file like:
  77  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
  78  * which will result in the first four devices on the first two
  79  * controllers being set to a tagged queue depth of 32.
  80  *
  81  * The tag_commands is an array of 16 to allow for wide and twin adapters.
  82  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
  83  * for channel 1.
  84  */
  85 typedef struct {
  86         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
  87 } adapter_tag_info_t;
  88
  89 /*
  90  * Modify this as you see fit for your system.
  91  *
  92  * 0                    tagged queuing disabled
  93  * 1 <= n <= 253        n == max tags ever dispatched.
  94  *
  95  * The driver will throttle the number of commands dispatched to a
  96  * device if it returns queue full.  For devices with a fixed maximum
  97  * queue depth, the driver will eventually determine this depth and
  98  * lock it in (a console message is printed to indicate that a lock
  99  * has occurred).  On some devices, queue full is returned for a temporary
 100  * resource shortage.  These devices will return queue full at varying
 101  * depths.  The driver will throttle back when the queue fulls occur and
 102  * attempt to slowly increase the depth over time as the device recovers
 103  * from the resource shortage.
 104  *
 105  * In this example, the first line will disable tagged queueing for all
 106  * the devices on the first probed aic79xx adapter.
 107  *
 108  * The second line enables tagged queueing with 4 commands/LUN for IDs
 109  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 110  * driver to attempt to use up to 64 tags for ID 1.
 111  *
 112  * The third line is the same as the first line.
 113  *
 114  * The fourth line disables tagged queueing for devices 0 and 3.  It
 115  * enables tagged queueing for the other IDs, with 16 commands/LUN
 116  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 117  * IDs 2, 5-7, and 9-15.
 118  */
 119
 120 /*
 121  * NOTE: The below structure is for reference only, the actual structure
 122  *       to modify in order to change things is just below this comment block.
 123 adapter_tag_info_t aic79xx_tag_info[] =
 124 {
 125         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 126         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 127         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 128         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 129 };
 130 */
 131
 132 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
 133 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
 134 #else
 135 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
 136 #endif
 137
 138 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
 139         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 140         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 141         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 142         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 143         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 144         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 145         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 146         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE                \
 147 }
 148
 149 /*
 150  * By default, use the number of commands specified by
 151  * the users kernel configuration.
 152  */
 153 static adapter_tag_info_t aic79xx_tag_info[] =
 154 {
 155         {AIC79XX_CONFIGED_TAG_COMMANDS},
 156         {AIC79XX_CONFIGED_TAG_COMMANDS},
 157         {AIC79XX_CONFIGED_TAG_COMMANDS},
 158         {AIC79XX_CONFIGED_TAG_COMMANDS},
 159         {AIC79XX_CONFIGED_TAG_COMMANDS},
 160         {AIC79XX_CONFIGED_TAG_COMMANDS},
 161         {AIC79XX_CONFIGED_TAG_COMMANDS},
 162         {AIC79XX_CONFIGED_TAG_COMMANDS},
 163         {AIC79XX_CONFIGED_TAG_COMMANDS},
 164         {AIC79XX_CONFIGED_TAG_COMMANDS},
 165         {AIC79XX_CONFIGED_TAG_COMMANDS},
 166         {AIC79XX_CONFIGED_TAG_COMMANDS},
 167         {AIC79XX_CONFIGED_TAG_COMMANDS},
 168         {AIC79XX_CONFIGED_TAG_COMMANDS},
 169         {AIC79XX_CONFIGED_TAG_COMMANDS},
 170         {AIC79XX_CONFIGED_TAG_COMMANDS}
 171 };
 172
 173 /*
 174  * The I/O cell on the chip is very configurable in respect to its analog
 175  * characteristics.  Set the defaults here; they can be overriden with
 176  * the proper insmod parameters.
 177  */
 178 struct ahd_linux_iocell_opts
 179 {
 180         uint8_t precomp;
 181         uint8_t slewrate;
 182         uint8_t amplitude;
 183 };
 184 #define AIC79XX_DEFAULT_PRECOMP         0xFF
 185 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
 186 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
 187 #define AIC79XX_DEFAULT_IOOPTS                  \
 188 {                                               \
 189         AIC79XX_DEFAULT_PRECOMP,                \
 190         AIC79XX_DEFAULT_SLEWRATE,               \
 191         AIC79XX_DEFAULT_AMPLITUDE               \
 192 }
 193 #define AIC79XX_PRECOMP_INDEX   0
 194 #define AIC79XX_SLEWRATE_INDEX  1
 195 #define AIC79XX_AMPLITUDE_INDEX 2
 196 static struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
 197 {
 198         AIC79XX_DEFAULT_IOOPTS,
 199         AIC79XX_DEFAULT_IOOPTS,
 200         AIC79XX_DEFAULT_IOOPTS,
 201         AIC79XX_DEFAULT_IOOPTS,
 202         AIC79XX_DEFAULT_IOOPTS,
 203         AIC79XX_DEFAULT_IOOPTS,
 204         AIC79XX_DEFAULT_IOOPTS,
 205         AIC79XX_DEFAULT_IOOPTS,
 206         AIC79XX_DEFAULT_IOOPTS,
 207         AIC79XX_DEFAULT_IOOPTS,
 208         AIC79XX_DEFAULT_IOOPTS,
 209         AIC79XX_DEFAULT_IOOPTS,
 210         AIC79XX_DEFAULT_IOOPTS,
 211         AIC79XX_DEFAULT_IOOPTS,
 212         AIC79XX_DEFAULT_IOOPTS,
 213         AIC79XX_DEFAULT_IOOPTS
 214 };
 215
 216 /*
 217  * There should be a specific return value for this in scsi.h, but
 218  * it seems that most drivers ignore it.
 219  */
 220 #define DID_UNDERFLOW   DID_ERROR
 221
 222 void
 223 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
 224 {
 225         printk("(scsi%d:%c:%d:%d): ",
 226                ahd->platform_data->host->host_no,
 227                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
 228                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
 229                scb != NULL ? SCB_GET_LUN(scb) : -1);
 230 }
 231
 232 /*
 233  * XXX - these options apply unilaterally to _all_ adapters
 234  *       cards in the system.  This should be fixed.  Exceptions to this
 235  *       rule are noted in the comments.
 236  */
 237
 238 /*
 239  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 240  * has no effect on any later resets that might occur due to things like
 241  * SCSI bus timeouts.
 242  */
 243 static uint32_t aic79xx_no_reset;
 244
 245 /*
 246  * Certain PCI motherboards will scan PCI devices from highest to lowest,
 247  * others scan from lowest to highest, and they tend to do all kinds of
 248  * strange things when they come into contact with PCI bridge chips.  The
 249  * net result of all this is that the PCI card that is actually used to boot
 250  * the machine is very hard to detect.  Most motherboards go from lowest
 251  * PCI slot number to highest, and the first SCSI controller found is the
 252  * one you boot from.  The only exceptions to this are when a controller
 253  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
 254  * from lowest PCI slot number to highest PCI slot number.  We also force
 255  * all controllers with their BIOS disabled to the end of the list.  This
 256  * works on *almost* all computers.  Where it doesn't work, we have this
 257  * option.  Setting this option to non-0 will reverse the order of the sort
 258  * to highest first, then lowest, but will still leave cards with their BIOS
 259  * disabled at the very end.  That should fix everyone up unless there are
 260  * really strange cirumstances.
 261  */
 262 static uint32_t aic79xx_reverse_scan;
 263
 264 /*
 265  * Should we force EXTENDED translation on a controller.
 266  *     0 == Use whatever is in the SEEPROM or default to off
 267  *     1 == Use whatever is in the SEEPROM or default to on
 268  */
 269 static uint32_t aic79xx_extended;
 270
 271 /*
 272  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 273  * dubious at best.  To my knowledge, this option has never actually
 274  * solved a PCI parity problem, but on certain machines with broken PCI
 275  * chipset configurations, it can generate tons of false error messages.
 276  * It's included in the driver for completeness.
 277  *   0     = Shut off PCI parity check
 278  *   non-0 = Enable PCI parity check
 279  *
 280  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
 281  * variable to -1 you would actually want to simply pass the variable
 282  * name without a number.  That will invert the 0 which will result in
 283  * -1.
 284  */
 285 static uint32_t aic79xx_pci_parity = ~0;
 286
 287 /*
 288  * There are lots of broken chipsets in the world.  Some of them will
 289  * violate the PCI spec when we issue byte sized memory writes to our
 290  * controller.  I/O mapped register access, if allowed by the given
 291  * platform, will work in almost all cases.
 292  */
 293 uint32_t aic79xx_allow_memio = ~0;
 294
 295 /*
 296  * So that we can set how long each device is given as a selection timeout.
 297  * The table of values goes like this:
 298  *   0 - 256ms
 299  *   1 - 128ms
 300  *   2 - 64ms
 301  *   3 - 32ms
 302  * We default to 256ms because some older devices need a longer time
 303  * to respond to initial selection.
 304  */
 305 static uint32_t aic79xx_seltime;
 306
 307 /*
 308  * Certain devices do not perform any aging on commands.  Should the
 309  * device be saturated by commands in one portion of the disk, it is
 310  * possible for transactions on far away sectors to never be serviced.
 311  * To handle these devices, we can periodically send an ordered tag to
 312  * force all outstanding transactions to be serviced prior to a new
 313  * transaction.
 314  */
 315 uint32_t aic79xx_periodic_otag;
 316
 317 /* Some storage boxes are using an LSI chip which has a bug making it
 318  * impossible to use aic79xx Rev B chip in 320 speeds.  The following
 319  * storage boxes have been reported to be buggy:
 320  * EonStor 3U 16-Bay: U16U-G3A3
 321  * EonStor 2U 12-Bay: U12U-G3A3
 322  * SentinelRAID: 2500F R5 / R6
 323  * SentinelRAID: 2500F R1
 324  * SentinelRAID: 2500F/1500F
 325  * SentinelRAID: 150F
 326  *
 327  * To get around this LSI bug, you can set your board to 160 mode
 328  * or you can enable the SLOWCRC bit.
 329  */
 330 uint32_t aic79xx_slowcrc;
 331
 332 /*
 333  * Module information and settable options.
 334  */
 335 static char *aic79xx = NULL;
 336
 337 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 338 MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
 339 MODULE_LICENSE("Dual BSD/GPL");
 340 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
 341 module_param(aic79xx, charp, 0444);
 342 MODULE_PARM_DESC(aic79xx,
 343 "period delimited, options string.\n"
 344 "       verbose                 Enable verbose/diagnostic logging\n"
 345 "       allow_memio             Allow device registers to be memory mapped\n"
 346 "       debug                   Bitmask of debug values to enable\n"
 347 "       no_reset                Supress initial bus resets\n"
 348 "       extended                Enable extended geometry on all controllers\n"
 349 "       periodic_otag           Send an ordered tagged transaction\n"
 350 "                               periodically to prevent tag starvation.\n"
 351 "                               This may be required by some older disk\n"
 352 "                               or drives/RAID arrays.\n"
 353 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 354 "       tag_info:<tag_str>      Set per-target tag depth\n"
 355 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
 356 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
 357 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
 358 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
 359 "       seltime:<int>           Selection Timeout:\n"
 360 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 361 "       slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"
 362 "\n"
 363 "       Sample /etc/modprobe.conf line:\n"
 364 "               Enable verbose logging\n"
 365 "               Set tag depth on Controller 2/Target 2 to 10 tags\n"
 366 "               Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
 369 "\n");
 370
 371 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahd_linux_sem_timeout(u_long arg);
 377 static int  ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 378 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
 379 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
 380                                      struct ahd_devinfo *devinfo);
 381 static void ahd_linux_device_queue_depth(struct scsi_device *);
 382 static int ahd_linux_run_command(struct ahd_softc*,
 383                                  struct ahd_linux_device *,
 384                                  struct scsi_cmnd *);
 385 static void ahd_linux_setup_tag_info_global(char *p);
 386 static int  aic79xx_setup(char *c);
 387
 388 static int ahd_linux_unit;
 389
 390
 391 /****************************** Inlines ***************************************/
 392 static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
 393
 394 static __inline void
 395 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
 396 {
 397         struct scsi_cmnd *cmd;
 398         int direction;
 399
 400         cmd = scb->io_ctx;
 401         direction = cmd->sc_data_direction;
 402         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
 403         if (cmd->use_sg != 0) {
 404                 struct scatterlist *sg;
 405
 406                 sg = (struct scatterlist *)cmd->request_buffer;
 407                 pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
 408         } else if (cmd->request_bufflen != 0) {
 409                 pci_unmap_single(ahd->dev_softc,
 410                                  scb->platform_data->buf_busaddr,
 411                                  cmd->request_bufflen, direction);
 412         }
 413 }
 414
 415 /******************************** Macros **************************************/
 416 #define BUILD_SCSIID(ahd, cmd)                                          \
 417         (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
 418
 419 /*
 420  * Return a string describing the driver.
 421  */
 422 static const char *
 423 ahd_linux_info(struct Scsi_Host *host)
 424 {
 425         static char buffer[512];
 426         char    ahd_info[256];
 427         char   *bp;
 428         struct ahd_softc *ahd;
 429
 430         bp = &buffer[0];
 431         ahd = *(struct ahd_softc **)host->hostdata;
 432         memset(bp, 0, sizeof(buffer));
 433         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
 434         strcat(bp, AIC79XX_DRIVER_VERSION);
 435         strcat(bp, "\n");
 436         strcat(bp, "        <");
 437         strcat(bp, ahd->description);
 438         strcat(bp, ">\n");
 439         strcat(bp, "        ");
 440         ahd_controller_info(ahd, ahd_info);
 441         strcat(bp, ahd_info);
 442         strcat(bp, "\n");
 443
 444         return (bp);
 445 }
 446
 447 /*
 448  * Queue an SCB to the controller.
 449  */
 450 static int
 451 ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 452 {
 453         struct   ahd_softc *ahd;
 454         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
 455         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 456         unsigned long flags;
 457
 458         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 459
 460         ahd_lock(ahd, &flags);
 461         if (ahd->platform_data->qfrozen == 0) {
 462                 cmd->scsi_done = scsi_done;
 463                 cmd->result = CAM_REQ_INPROG << 16;
 464                 rtn = ahd_linux_run_command(ahd, dev, cmd);
 465
 466         }
 467         ahd_unlock(ahd, &flags);
 468         return rtn;
 469 }
 470
 471 static inline struct scsi_target **
 472 ahd_linux_target_in_softc(struct scsi_target *starget)
 473 {
 474         struct  ahd_softc *ahd =
 475                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 476         unsigned int target_offset;
 477
 478         target_offset = starget->id;
 479         if (starget->channel != 0)
 480                 target_offset += 8;
 481
 482         return &ahd->platform_data->starget[target_offset];
 483 }
 484
 485 static int
 486 ahd_linux_target_alloc(struct scsi_target *starget)
 487 {
 488         struct  ahd_softc *ahd =
 489                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 490         unsigned long flags;
 491         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 492         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 493         struct ahd_devinfo devinfo;
 494         struct ahd_initiator_tinfo *tinfo;
 495         struct ahd_tmode_tstate *tstate;
 496         char channel = starget->channel + 'A';
 497
 498         ahd_lock(ahd, &flags);
 499
 500         BUG_ON(*ahd_targp != NULL);
 501
 502         *ahd_targp = starget;
 503         memset(targ, 0, sizeof(*targ));
 504
 505         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
 506                                     starget->id, &tstate);
 507         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
 508                             CAM_LUN_WILDCARD, channel,
 509                             ROLE_INITIATOR);
 510         spi_min_period(starget) = AHD_SYNCRATE_MAX; /* We can do U320 */
 511         if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
 512                 spi_max_offset(starget) = MAX_OFFSET_PACED_BUG;
 513         else
 514                 spi_max_offset(starget) = MAX_OFFSET_PACED;
 515         spi_max_width(starget) = ahd->features & AHD_WIDE;
 516
 517         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
 518                          AHD_TRANS_GOAL, /*paused*/FALSE);
 519         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 520                       AHD_TRANS_GOAL, /*paused*/FALSE);
 521         ahd_unlock(ahd, &flags);
 522
 523         return 0;
 524 }
 525
 526 static void
 527 ahd_linux_target_destroy(struct scsi_target *starget)
 528 {
 529         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 530
 531         *ahd_targp = NULL;
 532 }
 533
 534 static int
 535 ahd_linux_slave_alloc(struct scsi_device *sdev)
 536 {
 537         struct  ahd_softc *ahd =
 538                 *((struct ahd_softc **)sdev->host->hostdata);
 539         struct scsi_target *starget = sdev->sdev_target;
 540         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 541         struct ahd_linux_device *dev;
 542
 543         if (bootverbose)
 544                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
 545
 546         BUG_ON(targ->sdev[sdev->lun] != NULL);
 547
 548         dev = scsi_transport_device_data(sdev);
 549         memset(dev, 0, sizeof(*dev));
 550
 551         /*
 552          * We start out life using untagged
 553          * transactions of which we allow one.
 554          */
 555         dev->openings = 1;
 556
 557         /*
 558          * Set maxtags to 0.  This will be changed if we
 559          * later determine that we are dealing with
 560          * a tagged queuing capable device.
 561          */
 562         dev->maxtags = 0;
 563
 564         targ->sdev[sdev->lun] = sdev;
 565
 566         return (0);
 567 }
 568
 569 static int
 570 ahd_linux_slave_configure(struct scsi_device *sdev)
 571 {
 572         struct  ahd_softc *ahd;
 573
 574         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 575         if (bootverbose)
 576                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 577
 578         ahd_linux_device_queue_depth(sdev);
 579
 580         /* Initial Domain Validation */
 581         if (!spi_initial_dv(sdev->sdev_target))
 582                 spi_dv_device(sdev);
 583
 584         return 0;
 585 }
 586
 587 static void
 588 ahd_linux_slave_destroy(struct scsi_device *sdev)
 589 {
 590         struct  ahd_softc *ahd;
 591         struct  ahd_linux_device *dev = scsi_transport_device_data(sdev);
 592         struct  ahd_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 593
 594         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 595         if (bootverbose)
 596                 printf("%s: Slave Destroy %d\n", ahd_name(ahd), sdev->id);
 597
 598         BUG_ON(dev->active);
 599
 600         targ->sdev[sdev->lun] = NULL;
 601
 602 }
 603
 604 #if defined(__i386__)
 605 /*
 606  * Return the disk geometry for the given SCSI device.
 607  */
 608 static int
 609 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 610                     sector_t capacity, int geom[])
 611 {
 612         uint8_t *bh;
 613         int      heads;
 614         int      sectors;
 615         int      cylinders;
 616         int      ret;
 617         int      extended;
 618         struct   ahd_softc *ahd;
 619
 620         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 621
 622         bh = scsi_bios_ptable(bdev);
 623         if (bh) {
 624                 ret = scsi_partsize(bh, capacity,
 625                                     &geom[2], &geom[0], &geom[1]);
 626                 kfree(bh);
 627                 if (ret != -1)
 628                         return (ret);
 629         }
 630         heads = 64;
 631         sectors = 32;
 632         cylinders = aic_sector_div(capacity, heads, sectors);
 633
 634         if (aic79xx_extended != 0)
 635                 extended = 1;
 636         else
 637                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
 638         if (extended && cylinders >= 1024) {
 639                 heads = 255;
 640                 sectors = 63;
 641                 cylinders = aic_sector_div(capacity, heads, sectors);
 642         }
 643         geom[0] = heads;
 644         geom[1] = sectors;
 645         geom[2] = cylinders;
 646         return (0);
 647 }
 648 #endif
 649
 650 /*
 651  * Abort the current SCSI command(s).
 652  */
 653 static int
 654 ahd_linux_abort(struct scsi_cmnd *cmd)
 655 {
 656         int error;
 657
 658         error = ahd_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 659         if (error != 0)
 660                 printf("aic79xx_abort returns 0x%x\n", error);
 661         return error;
 662 }
 663
 664 /*
 665  * Attempt to send a target reset message to the device that timed out.
 666  */
 667 static int
 668 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
 669 {
 670         int error;
 671
 672         error = ahd_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 673         if (error != 0)
 674                 printf("aic79xx_dev_reset returns 0x%x\n", error);
 675         return error;
 676 }
 677
 678 /*
 679  * Reset the SCSI bus.
 680  */
 681 static int
 682 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
 683 {
 684         struct ahd_softc *ahd;
 685         u_long s;
 686         int    found;
 687
 688         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 689 #ifdef AHD_DEBUG
 690         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
 691                 printf("%s: Bus reset called for cmd %p\n",
 692                        ahd_name(ahd), cmd);
 693 #endif
 694         ahd_lock(ahd, &s);
 695         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
 696                                   /*initiate reset*/TRUE);
 697         ahd_unlock(ahd, &s);
 698
 699         if (bootverbose)
 700                 printf("%s: SCSI bus reset delivered. "
 701                        "%d SCBs aborted.\n", ahd_name(ahd), found);
 702
 703         return (SUCCESS);
 704 }
 705
 706 struct scsi_host_template aic79xx_driver_template = {
 707         .module                 = THIS_MODULE,
 708         .name                   = "aic79xx",
 709         .proc_name              = "aic79xx",
 710         .proc_info              = ahd_linux_proc_info,
 711         .info                   = ahd_linux_info,
 712         .queuecommand           = ahd_linux_queue,
 713         .eh_abort_handler       = ahd_linux_abort,
 714         .eh_device_reset_handler = ahd_linux_dev_reset,
 715         .eh_bus_reset_handler   = ahd_linux_bus_reset,
 716 #if defined(__i386__)
 717         .bios_param             = ahd_linux_biosparam,
 718 #endif
 719         .can_queue              = AHD_MAX_QUEUE,
 720         .this_id                = -1,
 721         .cmd_per_lun            = 2,
 722         .use_clustering         = ENABLE_CLUSTERING,
 723         .slave_alloc            = ahd_linux_slave_alloc,
 724         .slave_configure        = ahd_linux_slave_configure,
 725         .slave_destroy          = ahd_linux_slave_destroy,
 726         .target_alloc           = ahd_linux_target_alloc,
 727         .target_destroy         = ahd_linux_target_destroy,
 728 };
 729
 730 /******************************** Bus DMA *************************************/
 731 int
 732 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
 733                    bus_size_t alignment, bus_size_t boundary,
 734                    dma_addr_t lowaddr, dma_addr_t highaddr,
 735                    bus_dma_filter_t *filter, void *filterarg,
 736                    bus_size_t maxsize, int nsegments,
 737                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 738 {
 739         bus_dma_tag_t dmat;
 740
 741         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 742         if (dmat == NULL)
 743                 return (ENOMEM);
 744
 745         /*
 746          * Linux is very simplistic about DMA memory.  For now don't
 747          * maintain all specification information.  Once Linux supplies
 748          * better facilities for doing these operations, or the
 749          * needs of this particular driver change, we might need to do
 750          * more here.
 751          */
 752         dmat->alignment = alignment;
 753         dmat->boundary = boundary;
 754         dmat->maxsize = maxsize;
 755         *ret_tag = dmat;
 756         return (0);
 757 }
 758
 759 void
 760 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
 761 {
 762         free(dmat, M_DEVBUF);
 763 }
 764
 765 int
 766 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 767                  int flags, bus_dmamap_t *mapp)
 768 {
 769         *vaddr = pci_alloc_consistent(ahd->dev_softc,
 770                                       dmat->maxsize, mapp);
 771         if (*vaddr == NULL)
 772                 return (ENOMEM);
 773         return(0);
 774 }
 775
 776 void
 777 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
 778                 void* vaddr, bus_dmamap_t map)
 779 {
 780         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
 781                             vaddr, map);
 782 }
 783
 784 int
 785 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
 786                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 787                 void *cb_arg, int flags)
 788 {
 789         /*
 790          * Assume for now that this will only be used during
 791          * initialization and not for per-transaction buffer mapping.
 792          */
 793         bus_dma_segment_t stack_sg;
 794
 795         stack_sg.ds_addr = map;
 796         stack_sg.ds_len = dmat->maxsize;
 797         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 798         return (0);
 799 }
 800
 801 void
 802 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 803 {
 804 }
 805
 806 int
 807 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 808 {
 809         /* Nothing to do */
 810         return (0);
 811 }
 812
 813 /********************* Platform Dependent Functions ***************************/
 814 /*
 815  * Compare "left hand" softc with "right hand" softc, returning:
 816  * < 0 - lahd has a lower priority than rahd
 817  *   0 - Softcs are equal
 818  * > 0 - lahd has a higher priority than rahd
 819  */
 820 int
 821 ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
 822 {
 823         int     value;
 824
 825         /*
 826          * Under Linux, cards are ordered as follows:
 827          *      1) PCI devices that are marked as the boot controller.
 828          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
 829          *      3) All remaining PCI devices sorted by bus/slot/func.
 830          */
 831 #if 0
 832         value = (lahd->flags & AHD_BOOT_CHANNEL)
 833               - (rahd->flags & AHD_BOOT_CHANNEL);
 834         if (value != 0)
 835                 /* Controllers set for boot have a *higher* priority */
 836                 return (value);
 837 #endif
 838
 839         value = (lahd->flags & AHD_BIOS_ENABLED)
 840               - (rahd->flags & AHD_BIOS_ENABLED);
 841         if (value != 0)
 842                 /* Controllers with BIOS enabled have a *higher* priority */
 843                 return (value);
 844
 845         /* Still equal.  Sort by bus/slot/func. */
 846         if (aic79xx_reverse_scan != 0)
 847                 value = ahd_get_pci_bus(lahd->dev_softc)
 848                       - ahd_get_pci_bus(rahd->dev_softc);
 849         else
 850                 value = ahd_get_pci_bus(rahd->dev_softc)
 851                       - ahd_get_pci_bus(lahd->dev_softc);
 852         if (value != 0)
 853                 return (value);
 854         if (aic79xx_reverse_scan != 0)
 855                 value = ahd_get_pci_slot(lahd->dev_softc)
 856                       - ahd_get_pci_slot(rahd->dev_softc);
 857         else
 858                 value = ahd_get_pci_slot(rahd->dev_softc)
 859                       - ahd_get_pci_slot(lahd->dev_softc);
 860         if (value != 0)
 861                 return (value);
 862
 863         value = rahd->channel - lahd->channel;
 864         return (value);
 865 }
 866
 867 static void
 868 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
 869 {
 870
 871         if ((instance >= 0)
 872          && (instance < NUM_ELEMENTS(aic79xx_iocell_info))) {
 873                 uint8_t *iocell_info;
 874
 875                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
 876                 iocell_info[index] = value & 0xFFFF;
 877                 if (bootverbose)
 878                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
 879         }
 880 }
 881
 882 static void
 883 ahd_linux_setup_tag_info_global(char *p)
 884 {
 885         int tags, i, j;
 886
 887         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 888         printf("Setting Global Tags= %d\n", tags);
 889
 890         for (i = 0; i < NUM_ELEMENTS(aic79xx_tag_info); i++) {
 891                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
 892                         aic79xx_tag_info[i].tag_commands[j] = tags;
 893                 }
 894         }
 895 }
 896
 897 static void
 898 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 899 {
 900
 901         if ((instance >= 0) && (targ >= 0)
 902          && (instance < NUM_ELEMENTS(aic79xx_tag_info))
 903          && (targ < AHD_NUM_TARGETS)) {
 904                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
 905                 if (bootverbose)
 906                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 907         }
 908 }
 909
 910 static char *
 911 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 912                        void (*callback)(u_long, int, int, int32_t),
 913                        u_long callback_arg)
 914 {
 915         char    *tok_end;
 916         char    *tok_end2;
 917         int      i;
 918         int      instance;
 919         int      targ;
 920         int      done;
 921         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 922
 923         /* All options use a ':' name/arg separator */
 924         if (*opt_arg != ':')
 925                 return (opt_arg);
 926         opt_arg++;
 927         instance = -1;
 928         targ = -1;
 929         done = FALSE;
 930         /*
 931          * Restore separator that may be in
 932          * the middle of our option argument.
 933          */
 934         tok_end = strchr(opt_arg, '\0');
 935         if (tok_end < end)
 936                 *tok_end = ',';
 937         while (!done) {
 938                 switch (*opt_arg) {
 939                 case '{':
 940                         if (instance == -1) {
 941                                 instance = 0;
 942                         } else {
 943                                 if (depth > 1) {
 944                                         if (targ == -1)
 945                                                 targ = 0;
 946                                 } else {
 947                                         printf("Malformed Option %s\n",
 948                                                opt_name);
 949                                         done = TRUE;
 950                                 }
 951                         }
 952                         opt_arg++;
 953                         break;
 954                 case '}':
 955                         if (targ != -1)
 956                                 targ = -1;
 957                         else if (instance != -1)
 958                                 instance = -1;
 959                         opt_arg++;
 960                         break;
 961                 case ',':
 962                 case '.':
 963                         if (instance == -1)
 964                                 done = TRUE;
 965                         else if (targ >= 0)
 966                                 targ++;
 967                         else if (instance >= 0)
 968                                 instance++;
 969                         opt_arg++;
 970                         break;
 971                 case '\0':
 972                         done = TRUE;
 973                         break;
 974                 default:
 975                         tok_end = end;
 976                         for (i = 0; tok_list[i]; i++) {
 977                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 978                                 if ((tok_end2) && (tok_end2 < tok_end))
 979                                         tok_end = tok_end2;
 980                         }
 981                         callback(callback_arg, instance, targ,
 982                                  simple_strtol(opt_arg, NULL, 0));
 983                         opt_arg = tok_end;
 984                         break;
 985                 }
 986         }
 987         return (opt_arg);
 988 }
 989
 990 /*
 991  * Handle Linux boot parameters. This routine allows for assigning a value
 992  * to a parameter with a ':' between the parameter and the value.
 993  * ie. aic79xx=stpwlev:1,extended
 994  */
 995 static int
 996 aic79xx_setup(char *s)
 997 {
 998         int     i, n;
 999         char   *p;
1000         char   *end;
1001
1002         static struct {
1003                 const char *name;
1004                 uint32_t *flag;
1005         } options[] = {
1006                 { "extended", &aic79xx_extended },
1007                 { "no_reset", &aic79xx_no_reset },
1008                 { "verbose", &aic79xx_verbose },
1009                 { "allow_memio", &aic79xx_allow_memio},
1010 #ifdef AHD_DEBUG
1011                 { "debug", &ahd_debug },
1012 #endif
1013                 { "reverse_scan", &aic79xx_reverse_scan },
1014                 { "periodic_otag", &aic79xx_periodic_otag },
1015                 { "pci_parity", &aic79xx_pci_parity },
1016                 { "seltime", &aic79xx_seltime },
1017                 { "tag_info", NULL },
1018                 { "global_tag_depth", NULL},
1019                 { "slewrate", NULL },
1020                 { "precomp", NULL },
1021                 { "amplitude", NULL },
1022                 { "slowcrc", &aic79xx_slowcrc },
1023         };
1024
1025         end = strchr(s, '\0');
1026
1027         /*
1028          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1029          * will never be 0 in this case.
1030          */
1031         n = 0;
1032
1033         while ((p = strsep(&s, ",.")) != NULL) {
1034                 if (*p == '\0')
1035                         continue;
1036                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1037
1038                         n = strlen(options[i].name);
1039                         if (strncmp(options[i].name, p, n) == 0)
1040                                 break;
1041                 }
1042                 if (i == NUM_ELEMENTS(options))
1043                         continue;
1044
1045                 if (strncmp(p, "global_tag_depth", n) == 0) {
1046                         ahd_linux_setup_tag_info_global(p + n);
1047                 } else if (strncmp(p, "tag_info", n) == 0) {
1048                         s = ahd_parse_brace_option("tag_info", p + n, end,
1049                             2, ahd_linux_setup_tag_info, 0);
1050                 } else if (strncmp(p, "slewrate", n) == 0) {
1051                         s = ahd_parse_brace_option("slewrate",
1052                             p + n, end, 1, ahd_linux_setup_iocell_info,
1053                             AIC79XX_SLEWRATE_INDEX);
1054                 } else if (strncmp(p, "precomp", n) == 0) {
1055                         s = ahd_parse_brace_option("precomp",
1056                             p + n, end, 1, ahd_linux_setup_iocell_info,
1057                             AIC79XX_PRECOMP_INDEX);
1058                 } else if (strncmp(p, "amplitude", n) == 0) {
1059                         s = ahd_parse_brace_option("amplitude",
1060                             p + n, end, 1, ahd_linux_setup_iocell_info,
1061                             AIC79XX_AMPLITUDE_INDEX);
1062                 } else if (p[n] == ':') {
1063                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1064                 } else if (!strncmp(p, "verbose", n)) {
1065                         *(options[i].flag) = 1;
1066                 } else {
1067                         *(options[i].flag) ^= 0xFFFFFFFF;
1068                 }
1069         }
1070         return 1;
1071 }
1072
1073 __setup("aic79xx=", aic79xx_setup);
1074
1075 uint32_t aic79xx_verbose;
1076
1077 int
1078 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1079 {
1080         char    buf[80];
1081         struct  Scsi_Host *host;
1082         char    *new_name;
1083         u_long  s;
1084         int     retval;
1085
1086         template->name = ahd->description;
1087         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1088         if (host == NULL)
1089                 return (ENOMEM);
1090
1091         *((struct ahd_softc **)host->hostdata) = ahd;
1092         ahd->platform_data->host = host;
1093         host->can_queue = AHD_MAX_QUEUE;
1094         host->cmd_per_lun = 2;
1095         host->sg_tablesize = AHD_NSEG;
1096         host->this_id = ahd->our_id;
1097         host->irq = ahd->platform_data->irq;
1098         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1099         host->max_lun = AHD_NUM_LUNS;
1100         host->max_channel = 0;
1101         host->sg_tablesize = AHD_NSEG;
1102         ahd_lock(ahd, &s);
1103         ahd_set_unit(ahd, ahd_linux_unit++);
1104         ahd_unlock(ahd, &s);
1105         sprintf(buf, "scsi%d", host->host_no);
1106         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1107         if (new_name != NULL) {
1108                 strcpy(new_name, buf);
1109                 ahd_set_name(ahd, new_name);
1110         }
1111         host->unique_id = ahd->unit;
1112         ahd_linux_initialize_scsi_bus(ahd);
1113         ahd_intr_enable(ahd, TRUE);
1114
1115         host->transportt = ahd_linux_transport_template;
1116
1117         retval = scsi_add_host(host, &ahd->dev_softc->dev);
1118         if (retval) {
1119                 printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1120                 scsi_host_put(host);
1121                 return retval;
1122         }
1123
1124         scsi_scan_host(host);
1125         return 0;
1126 }
1127
1128 uint64_t
1129 ahd_linux_get_memsize(void)
1130 {
1131         struct sysinfo si;
1132
1133         si_meminfo(&si);
1134         return ((uint64_t)si.totalram << PAGE_SHIFT);
1135 }
1136
1137 /*
1138  * Place the SCSI bus into a known state by either resetting it,
1139  * or forcing transfer negotiations on the next command to any
1140  * target.
1141  */
1142 static void
1143 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1144 {
1145         u_int target_id;
1146         u_int numtarg;
1147         unsigned long s;
1148
1149         target_id = 0;
1150         numtarg = 0;
1151
1152         if (aic79xx_no_reset != 0)
1153                 ahd->flags &= ~AHD_RESET_BUS_A;
1154
1155         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1156                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1157         else
1158                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1159
1160         ahd_lock(ahd, &s);
1161
1162         /*
1163          * Force negotiation to async for all targets that
1164          * will not see an initial bus reset.
1165          */
1166         for (; target_id < numtarg; target_id++) {
1167                 struct ahd_devinfo devinfo;
1168                 struct ahd_initiator_tinfo *tinfo;
1169                 struct ahd_tmode_tstate *tstate;
1170
1171                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1172                                             target_id, &tstate);
1173                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1174                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1175                 ahd_update_neg_request(ahd, &devinfo, tstate,
1176                                        tinfo, AHD_NEG_ALWAYS);
1177         }
1178         ahd_unlock(ahd, &s);
1179         /* Give the bus some time to recover */
1180         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1181                 ahd_freeze_simq(ahd);
1182                 msleep(AIC79XX_RESET_DELAY);
1183                 ahd_release_simq(ahd);
1184         }
1185 }
1186
1187 int
1188 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1189 {
1190         ahd->platform_data =
1191             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
1192         if (ahd->platform_data == NULL)
1193                 return (ENOMEM);
1194         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1195         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1196         ahd_lockinit(ahd);
1197         init_MUTEX_LOCKED(&ahd->platform_data->eh_sem);
1198         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1199         return (0);
1200 }
1201
1202 void
1203 ahd_platform_free(struct ahd_softc *ahd)
1204 {
1205         struct scsi_target *starget;
1206         int i, j;
1207
1208         if (ahd->platform_data != NULL) {
1209                 /* destroy all of the device and target objects */
1210                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1211                         starget = ahd->platform_data->starget[i];
1212                         if (starget != NULL) {
1213                                 for (j = 0; j < AHD_NUM_LUNS; j++) {
1214                                         struct ahd_linux_target *targ =
1215                                                 scsi_transport_target_data(starget);
1216                                         if (targ->sdev[j] == NULL)
1217                                                 continue;
1218                                         targ->sdev[j] = NULL;
1219                                 }
1220                                 ahd->platform_data->starget[i] = NULL;
1221                         }
1222                 }
1223
1224                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1225                         free_irq(ahd->platform_data->irq, ahd);
1226                 if (ahd->tags[0] == BUS_SPACE_PIO
1227                  && ahd->bshs[0].ioport != 0)
1228                         release_region(ahd->bshs[0].ioport, 256);
1229                 if (ahd->tags[1] == BUS_SPACE_PIO
1230                  && ahd->bshs[1].ioport != 0)
1231                         release_region(ahd->bshs[1].ioport, 256);
1232                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1233                  && ahd->bshs[0].maddr != NULL) {
1234                         iounmap(ahd->bshs[0].maddr);
1235                         release_mem_region(ahd->platform_data->mem_busaddr,
1236                                            0x1000);
1237                 }
1238                 if (ahd->platform_data->host)
1239                         scsi_host_put(ahd->platform_data->host);
1240
1241                 free(ahd->platform_data, M_DEVBUF);
1242         }
1243 }
1244
1245 void
1246 ahd_platform_init(struct ahd_softc *ahd)
1247 {
1248         /*
1249          * Lookup and commit any modified IO Cell options.
1250          */
1251         if (ahd->unit < NUM_ELEMENTS(aic79xx_iocell_info)) {
1252                 struct ahd_linux_iocell_opts *iocell_opts;
1253
1254                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1255                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1256                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1257                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1258                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1259                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1260                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1261         }
1262
1263 }
1264
1265 void
1266 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1267 {
1268         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1269                                 SCB_GET_CHANNEL(ahd, scb),
1270                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1271                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1272 }
1273
1274 void
1275 ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
1276                       ahd_queue_alg alg)
1277 {
1278         struct scsi_target *starget;
1279         struct ahd_linux_target *targ;
1280         struct ahd_linux_device *dev;
1281         struct scsi_device *sdev;
1282         int was_queuing;
1283         int now_queuing;
1284
1285         starget = ahd->platform_data->starget[devinfo->target];
1286         targ = scsi_transport_target_data(starget);
1287         BUG_ON(targ == NULL);
1288         sdev = targ->sdev[devinfo->lun];
1289         if (sdev == NULL)
1290                 return;
1291
1292         dev = scsi_transport_device_data(sdev);
1293
1294         if (dev == NULL)
1295                 return;
1296         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1297         switch (alg) {
1298         default:
1299         case AHD_QUEUE_NONE:
1300                 now_queuing = 0;
1301                 break;
1302         case AHD_QUEUE_BASIC:
1303                 now_queuing = AHD_DEV_Q_BASIC;
1304                 break;
1305         case AHD_QUEUE_TAGGED:
1306                 now_queuing = AHD_DEV_Q_TAGGED;
1307                 break;
1308         }
1309         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1310          && (was_queuing != now_queuing)
1311          && (dev->active != 0)) {
1312                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1313                 dev->qfrozen++;
1314         }
1315
1316         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1317         if (now_queuing) {
1318                 u_int usertags;
1319
1320                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1321                 if (!was_queuing) {
1322                         /*
1323                          * Start out agressively and allow our
1324                          * dynamic queue depth algorithm to take
1325                          * care of the rest.
1326                          */
1327                         dev->maxtags = usertags;
1328                         dev->openings = dev->maxtags - dev->active;
1329                 }
1330                 if (dev->maxtags == 0) {
1331                         /*
1332                          * Queueing is disabled by the user.
1333                          */
1334                         dev->openings = 1;
1335                 } else if (alg == AHD_QUEUE_TAGGED) {
1336                         dev->flags |= AHD_DEV_Q_TAGGED;
1337                         if (aic79xx_periodic_otag != 0)
1338                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1339                 } else
1340                         dev->flags |= AHD_DEV_Q_BASIC;
1341         } else {
1342                 /* We can only have one opening. */
1343                 dev->maxtags = 0;
1344                 dev->openings =  1 - dev->active;
1345         }
1346
1347         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1348         case AHD_DEV_Q_BASIC:
1349                 scsi_adjust_queue_depth(sdev,
1350                                         MSG_SIMPLE_TASK,
1351                                         dev->openings + dev->active);
1352                 break;
1353         case AHD_DEV_Q_TAGGED:
1354                 scsi_adjust_queue_depth(sdev,
1355                                         MSG_ORDERED_TASK,
1356                                         dev->openings + dev->active);
1357                 break;
1358         default:
1359                 /*
1360                  * We allow the OS to queue 2 untagged transactions to
1361                  * us at any time even though we can only execute them
1362                  * serially on the controller/device.  This should
1363                  * remove some latency.
1364                  */
1365                 scsi_adjust_queue_depth(sdev,
1366                                         /*NON-TAGGED*/0,
1367                                         /*queue depth*/2);
1368                 break;
1369         }
1370 }
1371
1372 int
1373 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1374                         int lun, u_int tag, role_t role, uint32_t status)
1375 {
1376         return 0;
1377 }
1378
1379 static u_int
1380 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1381 {
1382         static int warned_user;
1383         u_int tags;
1384
1385         tags = 0;
1386         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1387                 if (ahd->unit >= NUM_ELEMENTS(aic79xx_tag_info)) {
1388
1389                         if (warned_user == 0) {
1390                                 printf(KERN_WARNING
1391 "aic79xx: WARNING: Insufficient tag_info instances\n"
1392 "aic79xx: for installed controllers.  Using defaults\n"
1393 "aic79xx: Please update the aic79xx_tag_info array in\n"
1394 "aic79xx: the aic79xx_osm.c source file.\n");
1395                                 warned_user++;
1396                         }
1397                         tags = AHD_MAX_QUEUE;
1398                 } else {
1399                         adapter_tag_info_t *tag_info;
1400
1401                         tag_info = &aic79xx_tag_info[ahd->unit];
1402                         tags = tag_info->tag_commands[devinfo->target_offset];
1403                         if (tags > AHD_MAX_QUEUE)
1404                                 tags = AHD_MAX_QUEUE;
1405                 }
1406         }
1407         return (tags);
1408 }
1409
1410 /*
1411  * Determines the queue depth for a given device.
1412  */
1413 static void
1414 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1415 {
1416         struct  ahd_devinfo devinfo;
1417         u_int   tags;
1418         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1419
1420         ahd_compile_devinfo(&devinfo,
1421                             ahd->our_id,
1422                             sdev->sdev_target->id, sdev->lun,
1423                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1424                             ROLE_INITIATOR);
1425         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1426         if (tags != 0 && sdev->tagged_supported != 0) {
1427
1428                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_TAGGED);
1429                 ahd_print_devinfo(ahd, &devinfo);
1430                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1431         } else {
1432                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_NONE);
1433         }
1434 }
1435
1436 static int
1437 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1438                       struct scsi_cmnd *cmd)
1439 {
1440         struct   scb *scb;
1441         struct   hardware_scb *hscb;
1442         struct   ahd_initiator_tinfo *tinfo;
1443         struct   ahd_tmode_tstate *tstate;
1444         u_int    col_idx;
1445         uint16_t mask;
1446
1447         /*
1448          * Get an scb to use.
1449          */
1450         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1451                                     cmd->device->id, &tstate);
1452         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1453          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1454                 col_idx = AHD_NEVER_COL_IDX;
1455         } else {
1456                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1457                                             cmd->device->lun);
1458         }
1459         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1460                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1461                 return SCSI_MLQUEUE_HOST_BUSY;
1462         }
1463
1464         scb->io_ctx = cmd;
1465         scb->platform_data->dev = dev;
1466         hscb = scb->hscb;
1467         cmd->host_scribble = (char *)scb;
1468
1469         /*
1470          * Fill out basics of the HSCB.
1471          */
1472         hscb->control = 0;
1473         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1474         hscb->lun = cmd->device->lun;
1475         scb->hscb->task_management = 0;
1476         mask = SCB_GET_TARGET_MASK(ahd, scb);
1477
1478         if ((ahd->user_discenable & mask) != 0)
1479                 hscb->control |= DISCENB;
1480
1481         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1482                 scb->flags |= SCB_PACKETIZED;
1483
1484         if ((tstate->auto_negotiate & mask) != 0) {
1485                 scb->flags |= SCB_AUTO_NEGOTIATE;
1486                 scb->hscb->control |= MK_MESSAGE;
1487                 } else if (cmd->cmnd[0] == INQUIRY
1488                         && (tinfo->curr.offset != 0
1489                          || tinfo->curr.width != MSG_EXT_WDTR_BUS_8_BIT
1490                          || tinfo->curr.ppr_options != 0)
1491                         && (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ)==0) {
1492                         /*
1493                          * The SCSI spec requires inquiry
1494                          * commands to complete without
1495                          * reporting unit attention conditions.
1496                          * Because of this, an inquiry command
1497                          * that occurs just after a device is
1498                          * reset will result in a data phase
1499                          * with mismatched negotiated rates.
1500                          * The core already forces a renegotiation
1501                          * for reset events that are visible to
1502                          * our controller or that we initiate,
1503                          * but a third party device reset or a
1504                          * hot-plug insertion can still cause this
1505                          * issue.  Therefore, we force a re-negotiation
1506                          * for every inquiry command unless we
1507                          * are async.
1508                          */
1509                         scb->flags |= SCB_NEGOTIATE;
1510                         scb->hscb->control |= MK_MESSAGE;
1511         }
1512
1513         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1514                 int     msg_bytes;
1515                 uint8_t tag_msgs[2];
1516
1517                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1518                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1519                         hscb->control |= tag_msgs[0];
1520                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1521                                 dev->commands_since_idle_or_otag = 0;
1522                 } else
1523                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1524                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1525                         hscb->control |= MSG_ORDERED_TASK;
1526                         dev->commands_since_idle_or_otag = 0;
1527                 } else {
1528                         hscb->control |= MSG_SIMPLE_TASK;
1529                 }
1530         }
1531
1532         hscb->cdb_len = cmd->cmd_len;
1533         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1534
1535         scb->platform_data->xfer_len = 0;
1536         ahd_set_residual(scb, 0);
1537         ahd_set_sense_residual(scb, 0);
1538         scb->sg_count = 0;
1539         if (cmd->use_sg != 0) {
1540                 void    *sg;
1541                 struct   scatterlist *cur_seg;
1542                 u_int    nseg;
1543                 int      dir;
1544
1545                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1546                 dir = cmd->sc_data_direction;
1547                 nseg = pci_map_sg(ahd->dev_softc, cur_seg,
1548                                   cmd->use_sg, dir);
1549                 scb->platform_data->xfer_len = 0;
1550                 for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
1551                         dma_addr_t addr;
1552                         bus_size_t len;
1553
1554                         addr = sg_dma_address(cur_seg);
1555                         len = sg_dma_len(cur_seg);
1556                         scb->platform_data->xfer_len += len;
1557                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1558                                           /*last*/nseg == 1);
1559                 }
1560         } else if (cmd->request_bufflen != 0) {
1561                 void *sg;
1562                 dma_addr_t addr;
1563                 int dir;
1564
1565                 sg = scb->sg_list;
1566                 dir = cmd->sc_data_direction;
1567                 addr = pci_map_single(ahd->dev_softc,
1568                                       cmd->request_buffer,
1569                                       cmd->request_bufflen, dir);
1570                 scb->platform_data->xfer_len = cmd->request_bufflen;
1571                 scb->platform_data->buf_busaddr = addr;
1572                 sg = ahd_sg_setup(ahd, scb, sg, addr,
1573                                   cmd->request_bufflen, /*last*/TRUE);
1574         }
1575
1576         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1577         dev->openings--;
1578         dev->active++;
1579         dev->commands_issued++;
1580
1581         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1582                 dev->commands_since_idle_or_otag++;
1583         scb->flags |= SCB_ACTIVE;
1584         ahd_queue_scb(ahd, scb);
1585
1586         return 0;
1587 }
1588
1589 /*
1590  * SCSI controller interrupt handler.
1591  */
1592 irqreturn_t
1593 ahd_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1594 {
1595         struct  ahd_softc *ahd;
1596         u_long  flags;
1597         int     ours;
1598
1599         ahd = (struct ahd_softc *) dev_id;
1600         ahd_lock(ahd, &flags);
1601         ours = ahd_intr(ahd);
1602         ahd_unlock(ahd, &flags);
1603         return IRQ_RETVAL(ours);
1604 }
1605
1606 void
1607 ahd_platform_flushwork(struct ahd_softc *ahd)
1608 {
1609
1610 }
1611
1612 void
1613 ahd_send_async(struct ahd_softc *ahd, char channel,
1614                u_int target, u_int lun, ac_code code, void *arg)
1615 {
1616         switch (code) {
1617         case AC_TRANSFER_NEG:
1618         {
1619                 char    buf[80];
1620                 struct  scsi_target *starget;
1621                 struct  ahd_linux_target *targ;
1622                 struct  info_str info;
1623                 struct  ahd_initiator_tinfo *tinfo;
1624                 struct  ahd_tmode_tstate *tstate;
1625                 unsigned int target_ppr_options;
1626
1627                 BUG_ON(target == CAM_TARGET_WILDCARD);
1628
1629                 info.buffer = buf;
1630                 info.length = sizeof(buf);
1631                 info.offset = 0;
1632                 info.pos = 0;
1633                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1634                                             target, &tstate);
1635
1636                 /*
1637                  * Don't bother reporting results while
1638                  * negotiations are still pending.
1639                  */
1640                 if (tinfo->curr.period != tinfo->goal.period
1641                  || tinfo->curr.width != tinfo->goal.width
1642                  || tinfo->curr.offset != tinfo->goal.offset
1643                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1644                         if (bootverbose == 0)
1645                                 break;
1646
1647                 /*
1648                  * Don't bother reporting results that
1649                  * are identical to those last reported.
1650                  */
1651                 starget = ahd->platform_data->starget[target];
1652                 if (starget == NULL)
1653                         break;
1654                 targ = scsi_transport_target_data(starget);
1655
1656                 target_ppr_options =
1657                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1658                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1659                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1660                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1661                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1662                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1663                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1664                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1665
1666                 if (tinfo->curr.period == spi_period(starget)
1667                     && tinfo->curr.width == spi_width(starget)
1668                     && tinfo->curr.offset == spi_offset(starget)
1669                  && tinfo->curr.ppr_options == target_ppr_options)
1670                         if (bootverbose == 0)
1671                                 break;
1672
1673                 spi_period(starget) = tinfo->curr.period;
1674                 spi_width(starget) = tinfo->curr.width;
1675                 spi_offset(starget) = tinfo->curr.offset;
1676                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1677                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1678                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1679                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1680                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1681                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1682                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1683                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1684                 spi_display_xfer_agreement(starget);
1685                 break;
1686         }
1687         case AC_SENT_BDR:
1688         {
1689                 WARN_ON(lun != CAM_LUN_WILDCARD);
1690                 scsi_report_device_reset(ahd->platform_data->host,
1691                                          channel - 'A', target);
1692                 break;
1693         }
1694         case AC_BUS_RESET:
1695                 if (ahd->platform_data->host != NULL) {
1696                         scsi_report_bus_reset(ahd->platform_data->host,
1697                                               channel - 'A');
1698                 }
1699                 break;
1700         default:
1701                 panic("ahd_send_async: Unexpected async event");
1702         }
1703 }
1704
1705 /*
1706  * Calls the higher level scsi done function and frees the scb.
1707  */
1708 void
1709 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1710 {
1711         struct scsi_cmnd *cmd;
1712         struct    ahd_linux_device *dev;
1713
1714         if ((scb->flags & SCB_ACTIVE) == 0) {
1715                 printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1716                 ahd_dump_card_state(ahd);
1717                 panic("Stopping for safety");
1718         }
1719         LIST_REMOVE(scb, pending_links);
1720         cmd = scb->io_ctx;
1721         dev = scb->platform_data->dev;
1722         dev->active--;
1723         dev->openings++;
1724         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1725                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1726                 dev->qfrozen--;
1727         }
1728         ahd_linux_unmap_scb(ahd, scb);
1729
1730         /*
1731          * Guard against stale sense data.
1732          * The Linux mid-layer assumes that sense
1733          * was retrieved anytime the first byte of
1734          * the sense buffer looks "sane".
1735          */
1736         cmd->sense_buffer[0] = 0;
1737         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1738                 uint32_t amount_xferred;
1739
1740                 amount_xferred =
1741                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1742                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1743 #ifdef AHD_DEBUG
1744                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1745                                 ahd_print_path(ahd, scb);
1746                                 printf("Set CAM_UNCOR_PARITY\n");
1747                         }
1748 #endif
1749                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1750 #ifdef AHD_REPORT_UNDERFLOWS
1751                 /*
1752                  * This code is disabled by default as some
1753                  * clients of the SCSI system do not properly
1754                  * initialize the underflow parameter.  This
1755                  * results in spurious termination of commands
1756                  * that complete as expected (e.g. underflow is
1757                  * allowed as command can return variable amounts
1758                  * of data.
1759                  */
1760                 } else if (amount_xferred < scb->io_ctx->underflow) {
1761                         u_int i;
1762
1763                         ahd_print_path(ahd, scb);
1764                         printf("CDB:");
1765                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1766                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1767                         printf("\n");
1768                         ahd_print_path(ahd, scb);
1769                         printf("Saw underflow (%ld of %ld bytes). "
1770                                "Treated as error\n",
1771                                 ahd_get_residual(scb),
1772                                 ahd_get_transfer_length(scb));
1773                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1774 #endif
1775                 } else {
1776                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1777                 }
1778         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1779                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1780         }
1781
1782         if (dev->openings == 1
1783          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1784          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1785                 dev->tag_success_count++;
1786         /*
1787          * Some devices deal with temporary internal resource
1788          * shortages by returning queue full.  When the queue
1789          * full occurrs, we throttle back.  Slowly try to get
1790          * back to our previous queue depth.
1791          */
1792         if ((dev->openings + dev->active) < dev->maxtags
1793          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1794                 dev->tag_success_count = 0;
1795                 dev->openings++;
1796         }
1797
1798         if (dev->active == 0)
1799                 dev->commands_since_idle_or_otag = 0;
1800
1801         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1802                 printf("Recovery SCB completes\n");
1803                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1804                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1805                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1806                 if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
1807                         ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
1808                         up(&ahd->platform_data->eh_sem);
1809                 }
1810         }
1811
1812         ahd_free_scb(ahd, scb);
1813         ahd_linux_queue_cmd_complete(ahd, cmd);
1814 }
1815
1816 static void
1817 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1818                              struct scsi_device *sdev, struct scb *scb)
1819 {
1820         struct  ahd_devinfo devinfo;
1821         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1822
1823         ahd_compile_devinfo(&devinfo,
1824                             ahd->our_id,
1825                             sdev->sdev_target->id, sdev->lun,
1826                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1827                             ROLE_INITIATOR);
1828
1829         /*
1830          * We don't currently trust the mid-layer to
1831          * properly deal with queue full or busy.  So,
1832          * when one occurs, we tell the mid-layer to
1833          * unconditionally requeue the command to us
1834          * so that we can retry it ourselves.  We also
1835          * implement our own throttling mechanism so
1836          * we don't clobber the device with too many
1837          * commands.
1838          */
1839         switch (ahd_get_scsi_status(scb)) {
1840         default:
1841                 break;
1842         case SCSI_STATUS_CHECK_COND:
1843         case SCSI_STATUS_CMD_TERMINATED:
1844         {
1845                 struct scsi_cmnd *cmd;
1846
1847                 /*
1848                  * Copy sense information to the OS's cmd
1849                  * structure if it is available.
1850                  */
1851                 cmd = scb->io_ctx;
1852                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1853                         struct scsi_status_iu_header *siu;
1854                         u_int sense_size;
1855                         u_int sense_offset;
1856
1857                         if (scb->flags & SCB_SENSE) {
1858                                 sense_size = MIN(sizeof(struct scsi_sense_data)
1859                                                - ahd_get_sense_residual(scb),
1860                                                  sizeof(cmd->sense_buffer));
1861                                 sense_offset = 0;
1862                         } else {
1863                                 /*
1864                                  * Copy only the sense data into the provided
1865                                  * buffer.
1866                                  */
1867                                 siu = (struct scsi_status_iu_header *)
1868                                     scb->sense_data;
1869                                 sense_size = MIN(scsi_4btoul(siu->sense_length),
1870                                                 sizeof(cmd->sense_buffer));
1871                                 sense_offset = SIU_SENSE_OFFSET(siu);
1872                         }
1873
1874                         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1875                         memcpy(cmd->sense_buffer,
1876                                ahd_get_sense_buf(ahd, scb)
1877                                + sense_offset, sense_size);
1878                         cmd->result |= (DRIVER_SENSE << 24);
1879
1880 #ifdef AHD_DEBUG
1881                         if (ahd_debug & AHD_SHOW_SENSE) {
1882                                 int i;
1883
1884                                 printf("Copied %d bytes of sense data at %d:",
1885                                        sense_size, sense_offset);
1886                                 for (i = 0; i < sense_size; i++) {
1887                                         if ((i & 0xF) == 0)
1888                                                 printf("\n");
1889                                         printf("0x%x ", cmd->sense_buffer[i]);
1890                                 }
1891                                 printf("\n");
1892                         }
1893 #endif
1894                 }
1895                 break;
1896         }
1897         case SCSI_STATUS_QUEUE_FULL:
1898                 /*
1899                  * By the time the core driver has returned this
1900                  * command, all other commands that were queued
1901                  * to us but not the device have been returned.
1902                  * This ensures that dev->active is equal to
1903                  * the number of commands actually queued to
1904                  * the device.
1905                  */
1906                 dev->tag_success_count = 0;
1907                 if (dev->active != 0) {
1908                         /*
1909                          * Drop our opening count to the number
1910                          * of commands currently outstanding.
1911                          */
1912                         dev->openings = 0;
1913 #ifdef AHD_DEBUG
1914                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1915                                 ahd_print_path(ahd, scb);
1916                                 printf("Dropping tag count to %d\n",
1917                                        dev->active);
1918                         }
1919 #endif
1920                         if (dev->active == dev->tags_on_last_queuefull) {
1921
1922                                 dev->last_queuefull_same_count++;
1923                                 /*
1924                                  * If we repeatedly see a queue full
1925                                  * at the same queue depth, this
1926                                  * device has a fixed number of tag
1927                                  * slots.  Lock in this tag depth
1928                                  * so we stop seeing queue fulls from
1929                                  * this device.
1930                                  */
1931                                 if (dev->last_queuefull_same_count
1932                                  == AHD_LOCK_TAGS_COUNT) {
1933                                         dev->maxtags = dev->active;
1934                                         ahd_print_path(ahd, scb);
1935                                         printf("Locking max tag count at %d\n",
1936                                                dev->active);
1937                                 }
1938                         } else {
1939                                 dev->tags_on_last_queuefull = dev->active;
1940                                 dev->last_queuefull_same_count = 0;
1941                         }
1942                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1943                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
1944                         ahd_platform_set_tags(ahd, &devinfo,
1945                                      (dev->flags & AHD_DEV_Q_BASIC)
1946                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1947                         break;
1948                 }
1949                 /*
1950                  * Drop down to a single opening, and treat this
1951                  * as if the target returned BUSY SCSI status.
1952                  */
1953                 dev->openings = 1;
1954                 ahd_platform_set_tags(ahd, &devinfo,
1955                              (dev->flags & AHD_DEV_Q_BASIC)
1956                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1957                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
1958         }
1959 }
1960
1961 static void
1962 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
1963 {
1964         /*
1965          * Map CAM error codes into Linux Error codes.  We
1966          * avoid the conversion so that the DV code has the
1967          * full error information available when making
1968          * state change decisions.
1969          */
1970         {
1971                 uint32_t status;
1972                 u_int new_status;
1973
1974                 status = ahd_cmd_get_transaction_status(cmd);
1975                 switch (status) {
1976                 case CAM_REQ_INPROG:
1977                 case CAM_REQ_CMP:
1978                 case CAM_SCSI_STATUS_ERROR:
1979                         new_status = DID_OK;
1980                         break;
1981                 case CAM_REQ_ABORTED:
1982                         new_status = DID_ABORT;
1983                         break;
1984                 case CAM_BUSY:
1985                         new_status = DID_BUS_BUSY;
1986                         break;
1987                 case CAM_REQ_INVALID:
1988                 case CAM_PATH_INVALID:
1989                         new_status = DID_BAD_TARGET;
1990                         break;
1991                 case CAM_SEL_TIMEOUT:
1992                         new_status = DID_NO_CONNECT;
1993                         break;
1994                 case CAM_SCSI_BUS_RESET:
1995                 case CAM_BDR_SENT:
1996                         new_status = DID_RESET;
1997                         break;
1998                 case CAM_UNCOR_PARITY:
1999                         new_status = DID_PARITY;
2000                         break;
2001                 case CAM_CMD_TIMEOUT:
2002                         new_status = DID_TIME_OUT;
2003                         break;
2004                 case CAM_UA_ABORT:
2005                 case CAM_REQ_CMP_ERR:
2006                 case CAM_AUTOSENSE_FAIL:
2007                 case CAM_NO_HBA:
2008                 case CAM_DATA_RUN_ERR:
2009                 case CAM_UNEXP_BUSFREE:
2010                 case CAM_SEQUENCE_FAIL:
2011                 case CAM_CCB_LEN_ERR:
2012                 case CAM_PROVIDE_FAIL:
2013                 case CAM_REQ_TERMIO:
2014                 case CAM_UNREC_HBA_ERROR:
2015                 case CAM_REQ_TOO_BIG:
2016                         new_status = DID_ERROR;
2017                         break;
2018                 case CAM_REQUEUE_REQ:
2019                         new_status = DID_REQUEUE;
2020                         break;
2021                 default:
2022                         /* We should never get here */
2023                         new_status = DID_ERROR;
2024                         break;
2025                 }
2026
2027                 ahd_cmd_set_transaction_status(cmd, new_status);
2028         }
2029
2030         cmd->scsi_done(cmd);
2031 }
2032
2033 static void
2034 ahd_linux_sem_timeout(u_long arg)
2035 {
2036         struct  ahd_softc *ahd;
2037         u_long  s;
2038
2039         ahd = (struct ahd_softc *)arg;
2040
2041         ahd_lock(ahd, &s);
2042         if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
2043                 ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
2044                 up(&ahd->platform_data->eh_sem);
2045         }
2046         ahd_unlock(ahd, &s);
2047 }
2048
2049 void
2050 ahd_freeze_simq(struct ahd_softc *ahd)
2051 {
2052         unsigned long s;
2053
2054         ahd_lock(ahd, &s);
2055         ahd->platform_data->qfrozen++;
2056         if (ahd->platform_data->qfrozen == 1) {
2057                 scsi_block_requests(ahd->platform_data->host);
2058                 ahd_platform_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2059                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2060                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2061         }
2062         ahd_unlock(ahd, &s);
2063 }
2064
2065 void
2066 ahd_release_simq(struct ahd_softc *ahd)
2067 {
2068         u_long s;
2069         int    unblock_reqs;
2070
2071         unblock_reqs = 0;
2072         ahd_lock(ahd, &s);
2073         if (ahd->platform_data->qfrozen > 0)
2074                 ahd->platform_data->qfrozen--;
2075         if (ahd->platform_data->qfrozen == 0) {
2076                 unblock_reqs = 1;
2077         }
2078         ahd_unlock(ahd, &s);
2079         /*
2080          * There is still a race here.  The mid-layer
2081          * should keep its own freeze count and use
2082          * a bottom half handler to run the queues
2083          * so we can unblock with our own lock held.
2084          */
2085         if (unblock_reqs)
2086                 scsi_unblock_requests(ahd->platform_data->host);
2087 }
2088
2089 static int
2090 ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2091 {
2092         struct ahd_softc *ahd;
2093         struct ahd_linux_device *dev;
2094         struct scb *pending_scb;
2095         u_int  saved_scbptr;
2096         u_int  active_scbptr;
2097         u_int  last_phase;
2098         u_int  saved_scsiid;
2099         u_int  cdb_byte;
2100         int    retval;
2101         int    was_paused;
2102         int    paused;
2103         int    wait;
2104         int    disconnected;
2105         int    found;
2106         ahd_mode_state saved_modes;
2107         unsigned long flags;
2108
2109         pending_scb = NULL;
2110         paused = FALSE;
2111         wait = FALSE;
2112         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2113
2114         scmd_printk(KERN_INFO, cmd,
2115                "Attempting to queue a%s message:",
2116                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2117
2118         printf("CDB:");
2119         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2120                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2121         printf("\n");
2122
2123         ahd_lock(ahd, &flags);
2124
2125         /*
2126          * First determine if we currently own this command.
2127          * Start by searching the device queue.  If not found
2128          * there, check the pending_scb list.  If not found
2129          * at all, and the system wanted us to just abort the
2130          * command, return success.
2131          */
2132         dev = scsi_transport_device_data(cmd->device);
2133
2134         if (dev == NULL) {
2135                 /*
2136                  * No target device for this command exists,
2137                  * so we must not still own the command.
2138                  */
2139                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2140                 retval = SUCCESS;
2141                 goto no_cmd;
2142         }
2143
2144         /*
2145          * See if we can find a matching cmd in the pending list.
2146          */
2147         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2148                 if (pending_scb->io_ctx == cmd)
2149                         break;
2150         }
2151
2152         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2153
2154                 /* Any SCB for this device will do for a target reset */
2155                 LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2156                         if (ahd_match_scb(ahd, pending_scb,
2157                                           scmd_id(cmd),
2158                                           scmd_channel(cmd) + 'A',
2159                                           CAM_LUN_WILDCARD,
2160                                           SCB_LIST_NULL, ROLE_INITIATOR))
2161                                 break;
2162                 }
2163         }
2164
2165         if (pending_scb == NULL) {
2166                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2167                 goto no_cmd;
2168         }
2169
2170         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2171                 /*
2172                  * We can't queue two recovery actions using the same SCB
2173                  */
2174                 retval = FAILED;
2175                 goto  done;
2176         }
2177
2178         /*
2179          * Ensure that the card doesn't do anything
2180          * behind our back.  Also make sure that we
2181          * didn't "just" miss an interrupt that would
2182          * affect this cmd.
2183          */
2184         was_paused = ahd_is_paused(ahd);
2185         ahd_pause_and_flushwork(ahd);
2186         paused = TRUE;
2187
2188         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2189                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2190                 goto no_cmd;
2191         }
2192
2193         printf("%s: At time of recovery, card was %spaused\n",
2194                ahd_name(ahd), was_paused ? "" : "not ");
2195         ahd_dump_card_state(ahd);
2196
2197         disconnected = TRUE;
2198         if (flag == SCB_ABORT) {
2199                 if (ahd_search_qinfifo(ahd, cmd->device->id,
2200                                        cmd->device->channel + 'A',
2201                                        cmd->device->lun,
2202                                        pending_scb->hscb->tag,
2203                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2204                                        SEARCH_COMPLETE) > 0) {
2205                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2206                                ahd_name(ahd), cmd->device->channel,
2207                                cmd->device->id, cmd->device->lun);
2208                         retval = SUCCESS;
2209                         goto done;
2210                 }
2211         } else if (ahd_search_qinfifo(ahd, cmd->device->id,
2212                                       cmd->device->channel + 'A',
2213                                       cmd->device->lun, pending_scb->hscb->tag,
2214                                       ROLE_INITIATOR, /*status*/0,
2215                                       SEARCH_COUNT) > 0) {
2216                 disconnected = FALSE;
2217         }
2218
2219         saved_modes = ahd_save_modes(ahd);
2220         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2221         last_phase = ahd_inb(ahd, LASTPHASE);
2222         saved_scbptr = ahd_get_scbptr(ahd);
2223         active_scbptr = saved_scbptr;
2224         if (disconnected && ((last_phase != P_BUSFREE) ||
2225                              (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0)) {
2226                 struct scb *bus_scb;
2227
2228                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2229                 if (bus_scb == pending_scb)
2230                         disconnected = FALSE;
2231                 else if (flag != SCB_ABORT
2232                          && ahd_inb(ahd, SAVED_SCSIID) == pending_scb->hscb->scsiid
2233                          && ahd_inb(ahd, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2234                         disconnected = FALSE;
2235         }
2236
2237         /*
2238          * At this point, pending_scb is the scb associated with the
2239          * passed in command.  That command is currently active on the
2240          * bus or is in the disconnected state.
2241          */
2242         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2243         if (SCB_GET_TAG(pending_scb) == active_scbptr
2244              || (flag == SCB_DEVICE_RESET
2245                  && SCSIID_TARGET(ahd, saved_scsiid) == scmd_id(cmd))) {
2246
2247                 /*
2248                  * We're active on the bus, so assert ATN
2249                  * and hope that the target responds.
2250                  */
2251                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2252                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_DEVICE_RESET;
2253                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2254                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2255                 scmd_printk(KERN_INFO, cmd, "BDR message in message buffer\n");
2256                 wait = TRUE;
2257         } else if (last_phase != P_BUSFREE
2258                    && ahd_inb(ahd, SCSIPHASE) == 0) {
2259                 /*
2260                  * SCB is not identified, there
2261                  * is no pending REQ, and the sequencer
2262                  * has not seen a busfree.  Looks like
2263                  * a stuck connection waiting to
2264                  * go busfree.  Reset the bus.
2265                  */
2266                 found = ahd_reset_channel(ahd, cmd->device->channel + 'A',
2267                                           /*Initiate Reset*/TRUE);
2268                 printf("%s: Issued Channel %c Bus Reset. "
2269                        "%d SCBs aborted\n", ahd_name(ahd),
2270                        cmd->device->channel + 'A', found);
2271         } else if (disconnected) {
2272
2273                 /*
2274                  * Actually re-queue this SCB in an attempt
2275                  * to select the device before it reconnects.
2276                  */
2277                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2278                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2279                 pending_scb->hscb->cdb_len = 0;
2280                 pending_scb->hscb->task_attribute = 0;
2281                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2282
2283                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2284                         /*
2285                          * Mark the SCB has having an outstanding
2286                          * task management function.  Should the command
2287                          * complete normally before the task management
2288                          * function can be sent, the host will be notified
2289                          * to abort our requeued SCB.
2290                          */
2291                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2292                                  pending_scb->hscb->task_management);
2293                 } else {
2294                         /*
2295                          * If non-packetized, set the MK_MESSAGE control
2296                          * bit indicating that we desire to send a message.
2297                          * We also set the disconnected flag since there is
2298                          * no guarantee that our SCB control byte matches
2299                          * the version on the card.  We don't want the
2300                          * sequencer to abort the command thinking an
2301                          * unsolicited reselection occurred.
2302                          */
2303                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2304
2305                         /*
2306                          * The sequencer will never re-reference the
2307                          * in-core SCB.  To make sure we are notified
2308                          * during reslection, set the MK_MESSAGE flag in
2309                          * the card's copy of the SCB.
2310                          */
2311                         ahd_outb(ahd, SCB_CONTROL,
2312                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2313                 }
2314
2315                 /*
2316                  * Clear out any entries in the QINFIFO first
2317                  * so we are the next SCB for this target
2318                  * to run.
2319                  */
2320                 ahd_search_qinfifo(ahd, cmd->device->id,
2321                                    cmd->device->channel + 'A', cmd->device->lun,
2322                                    SCB_LIST_NULL, ROLE_INITIATOR,
2323                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2324                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2325                 ahd_set_scbptr(ahd, saved_scbptr);
2326                 ahd_print_path(ahd, pending_scb);
2327                 printf("Device is disconnected, re-queuing SCB\n");
2328                 wait = TRUE;
2329         } else {
2330                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2331                 retval = FAILED;
2332                 goto done;
2333         }
2334
2335 no_cmd:
2336         /*
2337          * Our assumption is that if we don't have the command, no
2338          * recovery action was required, so we return success.  Again,
2339          * the semantics of the mid-layer recovery engine are not
2340          * well defined, so this may change in time.
2341          */
2342         retval = SUCCESS;
2343 done:
2344         if (paused)
2345                 ahd_unpause(ahd);
2346         if (wait) {
2347                 struct timer_list timer;
2348                 int ret;
2349
2350                 ahd->platform_data->flags |= AHD_SCB_UP_EH_SEM;
2351                 ahd_unlock(ahd, &flags);
2352
2353                 init_timer(&timer);
2354                 timer.data = (u_long)ahd;
2355                 timer.expires = jiffies + (5 * HZ);
2356                 timer.function = ahd_linux_sem_timeout;
2357                 add_timer(&timer);
2358                 printf("%s: Recovery code sleeping\n", ahd_name(ahd));
2359                 down(&ahd->platform_data->eh_sem);
2360                 printf("%s: Recovery code awake\n", ahd_name(ahd));
2361                 ret = del_timer_sync(&timer);
2362                 if (ret == 0) {
2363                         printf("%s: Timer Expired (active %d)\n",
2364                                ahd_name(ahd), dev->active);
2365                         retval = FAILED;
2366                 }
2367         } else
2368                 ahd_unlock(ahd, &flags);
2369
2370         return (retval);
2371 }
2372
2373 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2374 {
2375         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2376         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2377         struct ahd_devinfo devinfo;
2378         unsigned long flags;
2379
2380         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2381                             starget->channel + 'A', ROLE_INITIATOR);
2382         ahd_lock(ahd, &flags);
2383         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2384         ahd_unlock(ahd, &flags);
2385 }
2386
2387 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2388 {
2389         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2390         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2391         struct ahd_tmode_tstate *tstate;
2392         struct ahd_initiator_tinfo *tinfo
2393                 = ahd_fetch_transinfo(ahd,
2394                                       starget->channel + 'A',
2395                                       shost->this_id, starget->id, &tstate);
2396         struct ahd_devinfo devinfo;
2397         unsigned int ppr_options = tinfo->goal.ppr_options;
2398         unsigned int dt;
2399         unsigned long flags;
2400         unsigned long offset = tinfo->goal.offset;
2401
2402 #ifdef AHD_DEBUG
2403         if ((ahd_debug & AHD_SHOW_DV) != 0)
2404                 printf("%s: set period to %d\n", ahd_name(ahd), period);
2405 #endif
2406         if (offset == 0)
2407                 offset = MAX_OFFSET;
2408
2409         if (period < 8)
2410                 period = 8;
2411         if (period < 10) {
2412                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2413                 if (period == 8)
2414                         ppr_options |= MSG_EXT_PPR_IU_REQ;
2415         }
2416
2417         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2418
2419         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2420                             starget->channel + 'A', ROLE_INITIATOR);
2421
2422         /* all PPR requests apart from QAS require wide transfers */
2423         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2424                 if (spi_width(starget) == 0)
2425                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2426         }
2427
2428         ahd_find_syncrate(ahd, &period, &ppr_options,
2429                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2430
2431         ahd_lock(ahd, &flags);
2432         ahd_set_syncrate(ahd, &devinfo, period, offset,
2433                          ppr_options, AHD_TRANS_GOAL, FALSE);
2434         ahd_unlock(ahd, &flags);
2435 }
2436
2437 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2438 {
2439         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2440         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2441         struct ahd_tmode_tstate *tstate;
2442         struct ahd_initiator_tinfo *tinfo
2443                 = ahd_fetch_transinfo(ahd,
2444                                       starget->channel + 'A',
2445                                       shost->this_id, starget->id, &tstate);
2446         struct ahd_devinfo devinfo;
2447         unsigned int ppr_options = 0;
2448         unsigned int period = 0;
2449         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2450         unsigned long flags;
2451
2452 #ifdef AHD_DEBUG
2453         if ((ahd_debug & AHD_SHOW_DV) != 0)
2454                 printf("%s: set offset to %d\n", ahd_name(ahd), offset);
2455 #endif
2456
2457         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2458                             starget->channel + 'A', ROLE_INITIATOR);
2459         if (offset != 0) {
2460                 period = tinfo->goal.period;
2461                 ppr_options = tinfo->goal.ppr_options;
2462                 ahd_find_syncrate(ahd, &period, &ppr_options,
2463                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2464         }
2465
2466         ahd_lock(ahd, &flags);
2467         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2468                          AHD_TRANS_GOAL, FALSE);
2469         ahd_unlock(ahd, &flags);
2470 }
2471
2472 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2473 {
2474         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2475         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2476         struct ahd_tmode_tstate *tstate;
2477         struct ahd_initiator_tinfo *tinfo
2478                 = ahd_fetch_transinfo(ahd,
2479                                       starget->channel + 'A',
2480                                       shost->this_id, starget->id, &tstate);
2481         struct ahd_devinfo devinfo;
2482         unsigned int ppr_options = tinfo->goal.ppr_options
2483                 & ~MSG_EXT_PPR_DT_REQ;
2484         unsigned int period = tinfo->goal.period;
2485         unsigned int width = tinfo->goal.width;
2486         unsigned long flags;
2487
2488 #ifdef AHD_DEBUG
2489         if ((ahd_debug & AHD_SHOW_DV) != 0)
2490                 printf("%s: %s DT\n", ahd_name(ahd),
2491                        dt ? "enabling" : "disabling");
2492 #endif
2493         if (dt) {
2494                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2495                 if (!width)
2496                         ahd_linux_set_width(starget, 1);
2497         } else {
2498                 if (period <= 9)
2499                         period = 10; /* If resetting DT, period must be >= 25ns */
2500                 /* IU is invalid without DT set */
2501                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2502         }
2503         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2504                             starget->channel + 'A', ROLE_INITIATOR);
2505         ahd_find_syncrate(ahd, &period, &ppr_options,
2506                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2507
2508         ahd_lock(ahd, &flags);
2509         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2510                          ppr_options, AHD_TRANS_GOAL, FALSE);
2511         ahd_unlock(ahd, &flags);
2512 }
2513
2514 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2515 {
2516         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2517         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2518         struct ahd_tmode_tstate *tstate;
2519         struct ahd_initiator_tinfo *tinfo
2520                 = ahd_fetch_transinfo(ahd,
2521                                       starget->channel + 'A',
2522                                       shost->this_id, starget->id, &tstate);
2523         struct ahd_devinfo devinfo;
2524         unsigned int ppr_options = tinfo->goal.ppr_options
2525                 & ~MSG_EXT_PPR_QAS_REQ;
2526         unsigned int period = tinfo->goal.period;
2527         unsigned int dt;
2528         unsigned long flags;
2529
2530 #ifdef AHD_DEBUG
2531         if ((ahd_debug & AHD_SHOW_DV) != 0)
2532                 printf("%s: %s QAS\n", ahd_name(ahd),
2533                        qas ? "enabling" : "disabling");
2534 #endif
2535
2536         if (qas) {
2537                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2538         }
2539
2540         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2541
2542         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2543                             starget->channel + 'A', ROLE_INITIATOR);
2544         ahd_find_syncrate(ahd, &period, &ppr_options,
2545                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2546
2547         ahd_lock(ahd, &flags);
2548         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2549                          ppr_options, AHD_TRANS_GOAL, FALSE);
2550         ahd_unlock(ahd, &flags);
2551 }
2552
2553 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2554 {
2555         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2556         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2557         struct ahd_tmode_tstate *tstate;
2558         struct ahd_initiator_tinfo *tinfo
2559                 = ahd_fetch_transinfo(ahd,
2560                                       starget->channel + 'A',
2561                                       shost->this_id, starget->id, &tstate);
2562         struct ahd_devinfo devinfo;
2563         unsigned int ppr_options = tinfo->goal.ppr_options
2564                 & ~MSG_EXT_PPR_IU_REQ;
2565         unsigned int period = tinfo->goal.period;
2566         unsigned int dt;
2567         unsigned long flags;
2568
2569 #ifdef AHD_DEBUG
2570         if ((ahd_debug & AHD_SHOW_DV) != 0)
2571                 printf("%s: %s IU\n", ahd_name(ahd),
2572                        iu ? "enabling" : "disabling");
2573 #endif
2574
2575         if (iu) {
2576                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2577                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2578         }
2579
2580         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2581
2582         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2583                             starget->channel + 'A', ROLE_INITIATOR);
2584         ahd_find_syncrate(ahd, &period, &ppr_options,
2585                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2586
2587         ahd_lock(ahd, &flags);
2588         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2589                          ppr_options, AHD_TRANS_GOAL, FALSE);
2590         ahd_unlock(ahd, &flags);
2591 }
2592
2593 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2594 {
2595         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2596         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2597         struct ahd_tmode_tstate *tstate;
2598         struct ahd_initiator_tinfo *tinfo
2599                 = ahd_fetch_transinfo(ahd,
2600                                       starget->channel + 'A',
2601                                       shost->this_id, starget->id, &tstate);
2602         struct ahd_devinfo devinfo;
2603         unsigned int ppr_options = tinfo->goal.ppr_options
2604                 & ~MSG_EXT_PPR_RD_STRM;
2605         unsigned int period = tinfo->goal.period;
2606         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2607         unsigned long flags;
2608
2609 #ifdef AHD_DEBUG
2610         if ((ahd_debug & AHD_SHOW_DV) != 0)
2611                 printf("%s: %s Read Streaming\n", ahd_name(ahd),
2612                        rdstrm  ? "enabling" : "disabling");
2613 #endif
2614
2615         if (rdstrm)
2616                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2617
2618         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2619                             starget->channel + 'A', ROLE_INITIATOR);
2620         ahd_find_syncrate(ahd, &period, &ppr_options,
2621                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2622
2623         ahd_lock(ahd, &flags);
2624         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2625                          ppr_options, AHD_TRANS_GOAL, FALSE);
2626         ahd_unlock(ahd, &flags);
2627 }
2628
2629 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2630 {
2631         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2632         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2633         struct ahd_tmode_tstate *tstate;
2634         struct ahd_initiator_tinfo *tinfo
2635                 = ahd_fetch_transinfo(ahd,
2636                                       starget->channel + 'A',
2637                                       shost->this_id, starget->id, &tstate);
2638         struct ahd_devinfo devinfo;
2639         unsigned int ppr_options = tinfo->goal.ppr_options
2640                 & ~MSG_EXT_PPR_WR_FLOW;
2641         unsigned int period = tinfo->goal.period;
2642         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2643         unsigned long flags;
2644
2645 #ifdef AHD_DEBUG
2646         if ((ahd_debug & AHD_SHOW_DV) != 0)
2647                 printf("%s: %s Write Flow Control\n", ahd_name(ahd),
2648                        wrflow ? "enabling" : "disabling");
2649 #endif
2650
2651         if (wrflow)
2652                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2653
2654         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2655                             starget->channel + 'A', ROLE_INITIATOR);
2656         ahd_find_syncrate(ahd, &period, &ppr_options,
2657                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2658
2659         ahd_lock(ahd, &flags);
2660         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2661                          ppr_options, AHD_TRANS_GOAL, FALSE);
2662         ahd_unlock(ahd, &flags);
2663 }
2664
2665 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2666 {
2667         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2668         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2669         struct ahd_tmode_tstate *tstate;
2670         struct ahd_initiator_tinfo *tinfo
2671                 = ahd_fetch_transinfo(ahd,
2672                                       starget->channel + 'A',
2673                                       shost->this_id, starget->id, &tstate);
2674         struct ahd_devinfo devinfo;
2675         unsigned int ppr_options = tinfo->goal.ppr_options
2676                 & ~MSG_EXT_PPR_RTI;
2677         unsigned int period = tinfo->goal.period;
2678         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2679         unsigned long flags;
2680
2681         if ((ahd->features & AHD_RTI) == 0) {
2682 #ifdef AHD_DEBUG
2683                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2684                         printf("%s: RTI not available\n", ahd_name(ahd));
2685 #endif
2686                 return;
2687         }
2688
2689 #ifdef AHD_DEBUG
2690         if ((ahd_debug & AHD_SHOW_DV) != 0)
2691                 printf("%s: %s RTI\n", ahd_name(ahd),
2692                        rti ? "enabling" : "disabling");
2693 #endif
2694
2695         if (rti)
2696                 ppr_options |= MSG_EXT_PPR_RTI;
2697
2698         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2699                             starget->channel + 'A', ROLE_INITIATOR);
2700         ahd_find_syncrate(ahd, &period, &ppr_options,
2701                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2702
2703         ahd_lock(ahd, &flags);
2704         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2705                          ppr_options, AHD_TRANS_GOAL, FALSE);
2706         ahd_unlock(ahd, &flags);
2707 }
2708
2709 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2710 {
2711         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2712         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2713         struct ahd_tmode_tstate *tstate;
2714         struct ahd_initiator_tinfo *tinfo
2715                 = ahd_fetch_transinfo(ahd,
2716                                       starget->channel + 'A',
2717                                       shost->this_id, starget->id, &tstate);
2718         struct ahd_devinfo devinfo;
2719         unsigned int ppr_options = tinfo->goal.ppr_options
2720                 & ~MSG_EXT_PPR_PCOMP_EN;
2721         unsigned int period = tinfo->goal.period;
2722         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2723         unsigned long flags;
2724
2725 #ifdef AHD_DEBUG
2726         if ((ahd_debug & AHD_SHOW_DV) != 0)
2727                 printf("%s: %s Precompensation\n", ahd_name(ahd),
2728                        pcomp ? "Enable" : "Disable");
2729 #endif
2730
2731         if (pcomp)
2732                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2733
2734         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2735                             starget->channel + 'A', ROLE_INITIATOR);
2736         ahd_find_syncrate(ahd, &period, &ppr_options,
2737                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2738
2739         ahd_lock(ahd, &flags);
2740         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2741                          ppr_options, AHD_TRANS_GOAL, FALSE);
2742         ahd_unlock(ahd, &flags);
2743 }
2744
2745 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2746 {
2747         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2748         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2749         struct ahd_tmode_tstate *tstate;
2750         struct ahd_initiator_tinfo *tinfo
2751                 = ahd_fetch_transinfo(ahd,
2752                                       starget->channel + 'A',
2753                                       shost->this_id, starget->id, &tstate);
2754         struct ahd_devinfo devinfo;
2755         unsigned int ppr_options = tinfo->goal.ppr_options
2756                 & ~MSG_EXT_PPR_HOLD_MCS;
2757         unsigned int period = tinfo->goal.period;
2758         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2759         unsigned long flags;
2760
2761         if (hold)
2762                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2763
2764         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2765                             starget->channel + 'A', ROLE_INITIATOR);
2766         ahd_find_syncrate(ahd, &period, &ppr_options,
2767                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2768
2769         ahd_lock(ahd, &flags);
2770         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2771                          ppr_options, AHD_TRANS_GOAL, FALSE);
2772         ahd_unlock(ahd, &flags);
2773 }
2774
2775
2776
2777 static struct spi_function_template ahd_linux_transport_functions = {
2778         .set_offset     = ahd_linux_set_offset,
2779         .show_offset    = 1,
2780         .set_period     = ahd_linux_set_period,
2781         .show_period    = 1,
2782         .set_width      = ahd_linux_set_width,
2783         .show_width     = 1,
2784         .set_dt         = ahd_linux_set_dt,
2785         .show_dt        = 1,
2786         .set_iu         = ahd_linux_set_iu,
2787         .show_iu        = 1,
2788         .set_qas        = ahd_linux_set_qas,
2789         .show_qas       = 1,
2790         .set_rd_strm    = ahd_linux_set_rd_strm,
2791         .show_rd_strm   = 1,
2792         .set_wr_flow    = ahd_linux_set_wr_flow,
2793         .show_wr_flow   = 1,
2794         .set_rti        = ahd_linux_set_rti,
2795         .show_rti       = 1,
2796         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2797         .show_pcomp_en  = 1,
2798         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2799         .show_hold_mcs  = 1,
2800 };
2801
2802 static int __init
2803 ahd_linux_init(void)
2804 {
2805         int     error = 0;
2806
2807         /*
2808          * If we've been passed any parameters, process them now.
2809          */
2810         if (aic79xx)
2811                 aic79xx_setup(aic79xx);
2812
2813         ahd_linux_transport_template =
2814                 spi_attach_transport(&ahd_linux_transport_functions);
2815         if (!ahd_linux_transport_template)
2816                 return -ENODEV;
2817
2818         scsi_transport_reserve_target(ahd_linux_transport_template,
2819                                       sizeof(struct ahd_linux_target));
2820         scsi_transport_reserve_device(ahd_linux_transport_template,
2821                                       sizeof(struct ahd_linux_device));
2822
2823         error = ahd_linux_pci_init();
2824         if (error)
2825                 spi_release_transport(ahd_linux_transport_template);
2826         return error;
2827 }
2828
2829 static void __exit
2830 ahd_linux_exit(void)
2831 {
2832         ahd_linux_pci_exit();
2833         spi_release_transport(ahd_linux_transport_template);
2834 }
2835
2836 module_init(ahd_linux_init);
2837 module_exit(ahd_linux_exit);