drivers/scsi/ide-scsi.c

   1 /*
   2  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   3  * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   8  *
   9  * With this driver, one can use the Linux SCSI drivers instead of the
  10  * native IDE ATAPI drivers.
  11  *
  12  * Ver 0.1   Dec  3 96   Initial version.
  13  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  14  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  15  *                        to Janos Farkas for pointing this out.
  16  *                       Avoid using bitfields in structures for m68k.
  17  *                       Added Scatter/Gather and DMA support.
  18  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  19  *                       Use variable timeout for each command.
  20  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  21  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  22  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  23  *                        for access through /dev/sg.
  24  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  25  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  26  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  27  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  28  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  29  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  30  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  31  */
  32
  33 #define IDESCSI_VERSION "0.92"
  34
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/string.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/ioport.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/errno.h>
  43 #include <linux/slab.h>
  44 #include <linux/ide.h>
  45 #include <linux/scatterlist.h>
  46 #include <linux/delay.h>
  47 #include <linux/mutex.h>
  48 #include <linux/bitops.h>
  49
  50 #include <asm/io.h>
  51 #include <asm/uaccess.h>
  52
  53 #include <scsi/scsi.h>
  54 #include <scsi/scsi_cmnd.h>
  55 #include <scsi/scsi_device.h>
  56 #include <scsi/scsi_host.h>
  57 #include <scsi/scsi_tcq.h>
  58 #include <scsi/sg.h>
  59
  60 #define IDESCSI_DEBUG_LOG               0
  61
  62 #if IDESCSI_DEBUG_LOG
  63 #define debug_log(fmt, args...) \
  64         printk(KERN_INFO "ide-scsi: " fmt, ## args)
  65 #else
  66 #define debug_log(fmt, args...) do {} while (0)
  67 #endif
  68
  69 /*
  70  *      SCSI command transformation layer
  71  */
  72 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  73
  74 /*
  75  *      Log flags
  76  */
  77 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  78
  79 typedef struct ide_scsi_obj {
  80         ide_drive_t             *drive;
  81         ide_driver_t            *driver;
  82         struct gendisk          *disk;
  83         struct Scsi_Host        *host;
  84
  85         unsigned long transform;                /* SCSI cmd translation layer */
  86         unsigned long log;                      /* log flags */
  87 } idescsi_scsi_t;
  88
  89 static DEFINE_MUTEX(idescsi_ref_mutex);
  90 /* Set by module param to skip cd */
  91 static int idescsi_nocd;
  92
  93 #define ide_scsi_g(disk) \
  94         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  95
  96 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
  97 {
  98         struct ide_scsi_obj *scsi = NULL;
  99
 100         mutex_lock(&idescsi_ref_mutex);
 101         scsi = ide_scsi_g(disk);
 102         if (scsi) {
 103                 if (ide_device_get(scsi->drive))
 104                         scsi = NULL;
 105                 else
 106                         scsi_host_get(scsi->host);
 107         }
 108         mutex_unlock(&idescsi_ref_mutex);
 109         return scsi;
 110 }
 111
 112 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 113 {
 114         ide_drive_t *drive = scsi->drive;
 115
 116         mutex_lock(&idescsi_ref_mutex);
 117         scsi_host_put(scsi->host);
 118         ide_device_put(drive);
 119         mutex_unlock(&idescsi_ref_mutex);
 120 }
 121
 122 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 123 {
 124         return (idescsi_scsi_t*) (&host[1]);
 125 }
 126
 127 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 128 {
 129         return scsihost_to_idescsi(ide_drive->driver_data);
 130 }
 131
 132 static void ide_scsi_hex_dump(u8 *data, int len)
 133 {
 134         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 135 }
 136
 137 static int idescsi_end_request(ide_drive_t *, int, int);
 138
 139 static void ide_scsi_callback(ide_drive_t *drive, int dsc)
 140 {
 141         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 142         struct ide_atapi_pc *pc = drive->pc;
 143
 144         if (pc->flags & PC_FLAG_TIMEDOUT)
 145                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 146                           pc->scsi_cmd->serial_number, jiffies);
 147                 /* end this request now - scsi should retry it*/
 148         else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 149                 printk(KERN_INFO "Packet command completed, %d bytes"
 150                                  " transferred\n", pc->xferred);
 151
 152         idescsi_end_request(drive, 1, 0);
 153 }
 154
 155 static int idescsi_check_condition(ide_drive_t *drive,
 156                 struct request *failed_cmd)
 157 {
 158         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 159         struct ide_atapi_pc   *pc;
 160         struct request *rq;
 161         u8             *buf;
 162
 163         /* stuff a sense request in front of our current request */
 164         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 165         rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
 166         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 167         if (!pc || !rq || !buf) {
 168                 kfree(buf);
 169                 if (rq)
 170                         blk_put_request(rq);
 171                 kfree(pc);
 172                 return -ENOMEM;
 173         }
 174         rq->special = (char *) pc;
 175         pc->rq = rq;
 176         pc->buf = buf;
 177         pc->c[0] = REQUEST_SENSE;
 178         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 179         rq->cmd_type = REQ_TYPE_SENSE;
 180         rq->cmd_flags |= REQ_PREEMPT;
 181         pc->timeout = jiffies + WAIT_READY;
 182         /* NOTE! Save the failed packet command in "rq->buffer" */
 183         rq->buffer = (void *) failed_cmd->special;
 184         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 185         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 186                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 187                 ide_scsi_hex_dump(pc->c, 6);
 188         }
 189         rq->rq_disk = scsi->disk;
 190         rq->ref_count++;
 191         memcpy(rq->cmd, pc->c, 12);
 192         ide_do_drive_cmd(drive, rq);
 193         return 0;
 194 }
 195
 196 static ide_startstop_t
 197 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 198 {
 199         ide_hwif_t *hwif = drive->hwif;
 200
 201         if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
 202                 /* force an abort */
 203                 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
 204
 205         rq->errors++;
 206
 207         idescsi_end_request(drive, 0, 0);
 208
 209         return ide_stopped;
 210 }
 211
 212 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 213 {
 214         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 215         struct request *rq = HWGROUP(drive)->rq;
 216         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 217         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 218         struct Scsi_Host *host;
 219         int errors = rq->errors;
 220         unsigned long flags;
 221
 222         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 223                 ide_end_request(drive, uptodate, nrsecs);
 224                 return 0;
 225         }
 226         ide_end_drive_cmd (drive, 0, 0);
 227         if (blk_sense_request(rq)) {
 228                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 229                 if (log) {
 230                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 231                         ide_scsi_hex_dump(pc->buf, 16);
 232                 }
 233                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 234                         SCSI_SENSE_BUFFERSIZE);
 235                 kfree(pc->buf);
 236                 kfree(pc);
 237                 blk_put_request(rq);
 238                 pc = opc;
 239                 rq = pc->rq;
 240                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 241                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 242                                   DID_TIME_OUT :
 243                                   DID_OK) << 16);
 244         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 245                 if (log)
 246                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 247                                         drive->name, pc->scsi_cmd->serial_number);
 248                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 249         } else if (errors >= ERROR_MAX) {
 250                 pc->scsi_cmd->result = DID_ERROR << 16;
 251                 if (log)
 252                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 253         } else if (errors) {
 254                 if (log)
 255                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 256                 if (!idescsi_check_condition(drive, rq))
 257                         /* we started a request sense, so we'll be back, exit for now */
 258                         return 0;
 259                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 260         } else {
 261                 pc->scsi_cmd->result = DID_OK << 16;
 262         }
 263         host = pc->scsi_cmd->device->host;
 264         spin_lock_irqsave(host->host_lock, flags);
 265         pc->done(pc->scsi_cmd);
 266         spin_unlock_irqrestore(host->host_lock, flags);
 267         kfree(pc);
 268         blk_put_request(rq);
 269         drive->pc = NULL;
 270         return 0;
 271 }
 272
 273 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 274 {
 275         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 276 }
 277
 278 static int idescsi_expiry(ide_drive_t *drive)
 279 {
 280         struct ide_atapi_pc *pc = drive->pc;
 281
 282         debug_log("%s called for %lu at %lu\n", __func__,
 283                   pc->scsi_cmd->serial_number, jiffies);
 284
 285         pc->flags |= PC_FLAG_TIMEDOUT;
 286
 287         return 0;                                       /* we do not want the ide subsystem to retry */
 288 }
 289
 290 /*
 291  *      Our interrupt handler.
 292  */
 293 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 294 {
 295         return ide_pc_intr(drive, idescsi_pc_intr, get_timeout(drive->pc),
 296                            idescsi_expiry, NULL, NULL, ide_io_buffers);
 297 }
 298
 299 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 300 {
 301         return ide_transfer_pc(drive, idescsi_pc_intr,
 302                                get_timeout(drive->pc), idescsi_expiry);
 303 }
 304
 305 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 306 {
 307         switch (pc->c[0]) {
 308                 case READ_6: case READ_10: case READ_12:
 309                         pc->flags &= ~PC_FLAG_WRITING;
 310                         return 0;
 311                 case WRITE_6: case WRITE_10: case WRITE_12:
 312                         pc->flags |= PC_FLAG_WRITING;
 313                         return 0;
 314                 default:
 315                         return 1;
 316         }
 317 }
 318
 319 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 320 {
 321         ide_hwif_t *hwif = drive->hwif;
 322         struct scatterlist *sg, *scsi_sg;
 323         int segments;
 324
 325         if (!pc->req_xfer || pc->req_xfer % 1024)
 326                 return 1;
 327
 328         if (idescsi_set_direction(pc))
 329                 return 1;
 330
 331         sg = hwif->sg_table;
 332         scsi_sg = scsi_sglist(pc->scsi_cmd);
 333         segments = scsi_sg_count(pc->scsi_cmd);
 334
 335         if (segments > hwif->sg_max_nents)
 336                 return 1;
 337
 338         hwif->sg_nents = segments;
 339         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 340
 341         return 0;
 342 }
 343
 344 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 345                 struct ide_atapi_pc *pc)
 346 {
 347         /* Set the current packet command */
 348         drive->pc = pc;
 349
 350         return ide_issue_pc(drive, idescsi_transfer_pc,
 351                             get_timeout(pc), idescsi_expiry);
 352 }
 353
 354 /*
 355  *      idescsi_do_request is our request handling function.
 356  */
 357 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 358 {
 359         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 360                   rq->cmd[0], rq->errors);
 361         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 362                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 363
 364         if (blk_sense_request(rq) || blk_special_request(rq)) {
 365                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 366
 367                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 368                         pc->flags |= PC_FLAG_DMA_OK;
 369
 370                 return idescsi_issue_pc(drive, pc);
 371         }
 372         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 373         idescsi_end_request (drive, 0, 0);
 374         return ide_stopped;
 375 }
 376
 377 #ifdef CONFIG_IDE_PROC_FS
 378 #define ide_scsi_devset_get(name, field) \
 379 static int get_##name(ide_drive_t *drive) \
 380 { \
 381         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 382         return scsi->field; \
 383 }
 384
 385 #define ide_scsi_devset_set(name, field) \
 386 static int set_##name(ide_drive_t *drive, int arg) \
 387 { \
 388         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 389         scsi->field = arg; \
 390         return 0; \
 391 }
 392
 393 #define ide_scsi_devset_rw_field(_name, _field) \
 394 ide_scsi_devset_get(_name, _field); \
 395 ide_scsi_devset_set(_name, _field); \
 396 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name);
 397
 398 ide_devset_rw_field(bios_cyl, bios_cyl);
 399 ide_devset_rw_field(bios_head, bios_head);
 400 ide_devset_rw_field(bios_sect, bios_sect);
 401
 402 ide_scsi_devset_rw_field(transform, transform);
 403 ide_scsi_devset_rw_field(log, log);
 404
 405 static const struct ide_proc_devset idescsi_settings[] = {
 406         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
 407         IDE_PROC_DEVSET(bios_head, 0,  255),
 408         IDE_PROC_DEVSET(bios_sect, 0,   63),
 409         IDE_PROC_DEVSET(log,       0,    1),
 410         IDE_PROC_DEVSET(transform, 0,    3),
 411         { 0 },
 412 };
 413 #endif
 414
 415 /*
 416  *      Driver initialization.
 417  */
 418 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 419 {
 420         if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
 421                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
 422         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 423 #if IDESCSI_DEBUG_LOG
 424         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 425 #endif /* IDESCSI_DEBUG_LOG */
 426
 427         drive->pc_callback = ide_scsi_callback;
 428
 429         ide_proc_register_driver(drive, scsi->driver);
 430 }
 431
 432 static void ide_scsi_remove(ide_drive_t *drive)
 433 {
 434         struct Scsi_Host *scsihost = drive->driver_data;
 435         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 436         struct gendisk *g = scsi->disk;
 437
 438         scsi_remove_host(scsihost);
 439         ide_proc_unregister_driver(drive, scsi->driver);
 440
 441         ide_unregister_region(g);
 442
 443         drive->driver_data = NULL;
 444         g->private_data = NULL;
 445         put_disk(g);
 446
 447         ide_scsi_put(scsi);
 448
 449         drive->scsi = 0;
 450 }
 451
 452 static int ide_scsi_probe(ide_drive_t *);
 453
 454 #ifdef CONFIG_IDE_PROC_FS
 455 static ide_proc_entry_t idescsi_proc[] = {
 456         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 457         { NULL, 0, NULL, NULL }
 458 };
 459 #endif
 460
 461 static ide_driver_t idescsi_driver = {
 462         .gen_driver = {
 463                 .owner          = THIS_MODULE,
 464                 .name           = "ide-scsi",
 465                 .bus            = &ide_bus_type,
 466         },
 467         .probe                  = ide_scsi_probe,
 468         .remove                 = ide_scsi_remove,
 469         .version                = IDESCSI_VERSION,
 470         .media                  = ide_scsi,
 471         .do_request             = idescsi_do_request,
 472         .end_request            = idescsi_end_request,
 473         .error                  = idescsi_atapi_error,
 474 #ifdef CONFIG_IDE_PROC_FS
 475         .proc                   = idescsi_proc,
 476         .settings               = idescsi_settings,
 477 #endif
 478 };
 479
 480 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 481 {
 482         struct gendisk *disk = inode->i_bdev->bd_disk;
 483         struct ide_scsi_obj *scsi;
 484
 485         if (!(scsi = ide_scsi_get(disk)))
 486                 return -ENXIO;
 487
 488         return 0;
 489 }
 490
 491 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 492 {
 493         struct gendisk *disk = inode->i_bdev->bd_disk;
 494         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 495
 496         ide_scsi_put(scsi);
 497
 498         return 0;
 499 }
 500
 501 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 502                         unsigned int cmd, unsigned long arg)
 503 {
 504         struct block_device *bdev = inode->i_bdev;
 505         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 506         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 507 }
 508
 509 static struct block_device_operations idescsi_ops = {
 510         .owner          = THIS_MODULE,
 511         .open           = idescsi_ide_open,
 512         .release        = idescsi_ide_release,
 513         .ioctl          = idescsi_ide_ioctl,
 514 };
 515
 516 static int idescsi_slave_configure(struct scsi_device * sdp)
 517 {
 518         /* Configure detected device */
 519         sdp->use_10_for_rw = 1;
 520         sdp->use_10_for_ms = 1;
 521         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 522         return 0;
 523 }
 524
 525 static const char *idescsi_info (struct Scsi_Host *host)
 526 {
 527         return "SCSI host adapter emulation for IDE ATAPI devices";
 528 }
 529
 530 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 531 {
 532         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 533
 534         if (cmd == SG_SET_TRANSFORM) {
 535                 if (arg)
 536                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 537                 else
 538                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 539                 return 0;
 540         } else if (cmd == SG_GET_TRANSFORM)
 541                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 542         return -EINVAL;
 543 }
 544
 545 static int idescsi_queue (struct scsi_cmnd *cmd,
 546                 void (*done)(struct scsi_cmnd *))
 547 {
 548         struct Scsi_Host *host = cmd->device->host;
 549         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 550         ide_drive_t *drive = scsi->drive;
 551         struct request *rq = NULL;
 552         struct ide_atapi_pc *pc = NULL;
 553         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
 554
 555         if (!drive) {
 556                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 557                 goto abort;
 558         }
 559         scsi = drive_to_idescsi(drive);
 560         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 561         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
 562         if (rq == NULL || pc == NULL) {
 563                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 564                 goto abort;
 565         }
 566
 567         memset (pc->c, 0, 12);
 568         pc->flags = 0;
 569         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 570                 pc->flags |= PC_FLAG_WRITING;
 571         pc->rq = rq;
 572         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 573         pc->buf = NULL;
 574         pc->sg = scsi_sglist(cmd);
 575         pc->sg_cnt = scsi_sg_count(cmd);
 576         pc->b_count = 0;
 577         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 578         pc->scsi_cmd = cmd;
 579         pc->done = done;
 580         pc->timeout = jiffies + cmd->request->timeout;
 581
 582         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 583                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 584                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 585                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 586                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 587                         ide_scsi_hex_dump(pc->c, 12);
 588                 }
 589         }
 590
 591         rq->special = (char *) pc;
 592         rq->cmd_type = REQ_TYPE_SPECIAL;
 593         spin_unlock_irq(host->host_lock);
 594         rq->ref_count++;
 595         memcpy(rq->cmd, pc->c, 12);
 596         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 597         spin_lock_irq(host->host_lock);
 598         return 0;
 599 abort:
 600         kfree (pc);
 601         if (rq)
 602                 blk_put_request(rq);
 603         cmd->result = DID_ERROR << 16;
 604         done(cmd);
 605         return 0;
 606 }
 607
 608 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 609 {
 610         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 611         ide_drive_t    *drive = scsi->drive;
 612         int             busy;
 613         int             ret   = FAILED;
 614
 615         struct ide_atapi_pc *pc;
 616
 617         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 618
 619         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 620                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 621
 622         if (!drive) {
 623                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 624                 WARN_ON(1);
 625                 goto no_drive;
 626         }
 627
 628         /* First give it some more time, how much is "right" is hard to say :-( */
 629
 630         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 631         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 632                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 633
 634         spin_lock_irq(&ide_lock);
 635
 636         /* If there is no pc running we're done (our interrupt took care of it) */
 637         pc = drive->pc;
 638         if (pc == NULL) {
 639                 ret = SUCCESS;
 640                 goto ide_unlock;
 641         }
 642
 643         /* It's somewhere in flight. Does ide subsystem agree? */
 644         if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 645             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
 646                 /*
 647                  * FIXME - not sure this condition can ever occur
 648                  */
 649                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 650
 651                 if (blk_sense_request(pc->rq))
 652                         kfree(pc->buf);
 653                 /* we need to call blk_put_request twice. */
 654                 blk_put_request(pc->rq);
 655                 blk_put_request(pc->rq);
 656                 kfree(pc);
 657                 drive->pc = NULL;
 658
 659                 ret = SUCCESS;
 660         }
 661
 662 ide_unlock:
 663         spin_unlock_irq(&ide_lock);
 664 no_drive:
 665         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 666                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 667
 668         return ret;
 669 }
 670
 671 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 672 {
 673         struct request *req;
 674         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 675         ide_drive_t    *drive = scsi->drive;
 676         int             ready = 0;
 677         int             ret   = SUCCESS;
 678
 679         struct ide_atapi_pc *pc;
 680
 681         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 682
 683         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 684                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 685
 686         if (!drive) {
 687                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 688                 WARN_ON(1);
 689                 return FAILED;
 690         }
 691
 692         spin_lock_irq(cmd->device->host->host_lock);
 693         spin_lock(&ide_lock);
 694
 695         pc = drive->pc;
 696
 697         if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 698                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 699                 spin_unlock(&ide_lock);
 700                 spin_unlock_irq(cmd->device->host->host_lock);
 701                 return FAILED;
 702         }
 703
 704         /* kill current request */
 705         if (__blk_end_request(req, -EIO, 0))
 706                 BUG();
 707         if (blk_sense_request(req))
 708                 kfree(pc->buf);
 709         kfree(pc);
 710         drive->pc = NULL;
 711         blk_put_request(req);
 712
 713         /* now nuke the drive queue */
 714         while ((req = elv_next_request(drive->queue))) {
 715                 if (__blk_end_request(req, -EIO, 0))
 716                         BUG();
 717         }
 718
 719         HWGROUP(drive)->rq = NULL;
 720         HWGROUP(drive)->handler = NULL;
 721         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 722         spin_unlock(&ide_lock);
 723
 724         ide_do_reset(drive);
 725
 726         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 727
 728         do {
 729                 spin_unlock_irq(cmd->device->host->host_lock);
 730                 msleep(50);
 731                 spin_lock_irq(cmd->device->host->host_lock);
 732         } while ( HWGROUP(drive)->handler );
 733
 734         ready = drive_is_ready(drive);
 735         HWGROUP(drive)->busy--;
 736         if (!ready) {
 737                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 738                 ret = FAILED;
 739         }
 740
 741         spin_unlock_irq(cmd->device->host->host_lock);
 742         return ret;
 743 }
 744
 745 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 746                 sector_t capacity, int *parm)
 747 {
 748         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 749         ide_drive_t *drive = idescsi->drive;
 750
 751         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 752                 parm[0] = drive->bios_head;
 753                 parm[1] = drive->bios_sect;
 754                 parm[2] = drive->bios_cyl;
 755         }
 756         return 0;
 757 }
 758
 759 static struct scsi_host_template idescsi_template = {
 760         .module                 = THIS_MODULE,
 761         .name                   = "idescsi",
 762         .info                   = idescsi_info,
 763         .slave_configure        = idescsi_slave_configure,
 764         .ioctl                  = idescsi_ioctl,
 765         .queuecommand           = idescsi_queue,
 766         .eh_abort_handler       = idescsi_eh_abort,
 767         .eh_host_reset_handler  = idescsi_eh_reset,
 768         .bios_param             = idescsi_bios,
 769         .can_queue              = 40,
 770         .this_id                = -1,
 771         .sg_tablesize           = 256,
 772         .cmd_per_lun            = 5,
 773         .max_sectors            = 128,
 774         .use_clustering         = DISABLE_CLUSTERING,
 775         .emulated               = 1,
 776         .proc_name              = "ide-scsi",
 777 };
 778
 779 static int ide_scsi_probe(ide_drive_t *drive)
 780 {
 781         idescsi_scsi_t *idescsi;
 782         struct Scsi_Host *host;
 783         struct gendisk *g;
 784         static int warned;
 785         int err = -ENOMEM;
 786         u16 last_lun;
 787
 788         if (!warned && drive->media == ide_cdrom) {
 789                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 790                 warned = 1;
 791         }
 792
 793         if (idescsi_nocd && drive->media == ide_cdrom)
 794                 return -ENODEV;
 795
 796         if (!strstr("ide-scsi", drive->driver_req) ||
 797             drive->media == ide_disk ||
 798             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 799                 return -ENODEV;
 800
 801         drive->scsi = 1;
 802
 803         g = alloc_disk(1 << PARTN_BITS);
 804         if (!g)
 805                 goto out_host_put;
 806
 807         ide_init_disk(g, drive);
 808
 809         host->max_id = 1;
 810
 811         last_lun = drive->id[ATA_ID_LAST_LUN];
 812         if (last_lun)
 813                 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
 814
 815         if ((last_lun & 7) != 7)
 816                 host->max_lun = (last_lun & 7) + 1;
 817         else
 818                 host->max_lun = 1;
 819
 820         drive->driver_data = host;
 821         idescsi = scsihost_to_idescsi(host);
 822         idescsi->drive = drive;
 823         idescsi->driver = &idescsi_driver;
 824         idescsi->host = host;
 825         idescsi->disk = g;
 826         g->private_data = &idescsi->driver;
 827         err = 0;
 828         idescsi_setup(drive, idescsi);
 829         g->fops = &idescsi_ops;
 830         ide_register_region(g);
 831         err = scsi_add_host(host, &drive->gendev);
 832         if (!err) {
 833                 scsi_scan_host(host);
 834                 return 0;
 835         }
 836         /* fall through on error */
 837         ide_unregister_region(g);
 838         ide_proc_unregister_driver(drive, &idescsi_driver);
 839
 840         put_disk(g);
 841 out_host_put:
 842         drive->scsi = 0;
 843         scsi_host_put(host);
 844         return err;
 845 }
 846
 847 static int __init init_idescsi_module(void)
 848 {
 849         return driver_register(&idescsi_driver.gen_driver);
 850 }
 851
 852 static void __exit exit_idescsi_module(void)
 853 {
 854         driver_unregister(&idescsi_driver.gen_driver);
 855 }
 856
 857 module_param(idescsi_nocd, int, 0600);
 858 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 859 module_init(init_idescsi_module);
 860 module_exit(exit_idescsi_module);
 861 MODULE_LICENSE("GPL");