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 /*
 274  *      Our interrupt handler.
 275  */
 276 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 277 {
 278         return ide_pc_intr(drive, idescsi_pc_intr);
 279 }
 280
 281 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 282 {
 283         return ide_transfer_pc(drive, idescsi_pc_intr,
 284                                ide_scsi_get_timeout(drive->pc),
 285                                ide_scsi_expiry);
 286 }
 287
 288 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 289 {
 290         switch (pc->c[0]) {
 291                 case READ_6: case READ_10: case READ_12:
 292                         pc->flags &= ~PC_FLAG_WRITING;
 293                         return 0;
 294                 case WRITE_6: case WRITE_10: case WRITE_12:
 295                         pc->flags |= PC_FLAG_WRITING;
 296                         return 0;
 297                 default:
 298                         return 1;
 299         }
 300 }
 301
 302 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 303 {
 304         ide_hwif_t *hwif = drive->hwif;
 305         struct scatterlist *sg, *scsi_sg;
 306         int segments;
 307
 308         if (!pc->req_xfer || pc->req_xfer % 1024)
 309                 return 1;
 310
 311         if (idescsi_set_direction(pc))
 312                 return 1;
 313
 314         sg = hwif->sg_table;
 315         scsi_sg = scsi_sglist(pc->scsi_cmd);
 316         segments = scsi_sg_count(pc->scsi_cmd);
 317
 318         if (segments > hwif->sg_max_nents)
 319                 return 1;
 320
 321         hwif->sg_nents = segments;
 322         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 323
 324         return 0;
 325 }
 326
 327 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 328                 struct ide_atapi_pc *pc)
 329 {
 330         /* Set the current packet command */
 331         drive->pc = pc;
 332
 333         return ide_issue_pc(drive, idescsi_transfer_pc,
 334                             ide_scsi_get_timeout(pc), ide_scsi_expiry);
 335 }
 336
 337 /*
 338  *      idescsi_do_request is our request handling function.
 339  */
 340 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 341 {
 342         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 343                   rq->cmd[0], rq->errors);
 344         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 345                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 346
 347         if (blk_sense_request(rq) || blk_special_request(rq)) {
 348                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 349
 350                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 351                         pc->flags |= PC_FLAG_DMA_OK;
 352
 353                 return idescsi_issue_pc(drive, pc);
 354         }
 355         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 356         idescsi_end_request (drive, 0, 0);
 357         return ide_stopped;
 358 }
 359
 360 #ifdef CONFIG_IDE_PROC_FS
 361 #define ide_scsi_devset_get(name, field) \
 362 static int get_##name(ide_drive_t *drive) \
 363 { \
 364         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 365         return scsi->field; \
 366 }
 367
 368 #define ide_scsi_devset_set(name, field) \
 369 static int set_##name(ide_drive_t *drive, int arg) \
 370 { \
 371         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 372         scsi->field = arg; \
 373         return 0; \
 374 }
 375
 376 #define ide_scsi_devset_rw_field(_name, _field) \
 377 ide_scsi_devset_get(_name, _field); \
 378 ide_scsi_devset_set(_name, _field); \
 379 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name);
 380
 381 ide_devset_rw_field(bios_cyl, bios_cyl);
 382 ide_devset_rw_field(bios_head, bios_head);
 383 ide_devset_rw_field(bios_sect, bios_sect);
 384
 385 ide_scsi_devset_rw_field(transform, transform);
 386 ide_scsi_devset_rw_field(log, log);
 387
 388 static const struct ide_proc_devset idescsi_settings[] = {
 389         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
 390         IDE_PROC_DEVSET(bios_head, 0,  255),
 391         IDE_PROC_DEVSET(bios_sect, 0,   63),
 392         IDE_PROC_DEVSET(log,       0,    1),
 393         IDE_PROC_DEVSET(transform, 0,    3),
 394         { 0 },
 395 };
 396 #endif
 397
 398 /*
 399  *      Driver initialization.
 400  */
 401 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 402 {
 403         if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
 404                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
 405         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 406 #if IDESCSI_DEBUG_LOG
 407         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 408 #endif /* IDESCSI_DEBUG_LOG */
 409
 410         drive->pc_callback       = ide_scsi_callback;
 411         drive->pc_update_buffers = NULL;
 412         drive->pc_io_buffers     = ide_io_buffers;
 413
 414         ide_proc_register_driver(drive, scsi->driver);
 415 }
 416
 417 static void ide_scsi_remove(ide_drive_t *drive)
 418 {
 419         struct Scsi_Host *scsihost = drive->driver_data;
 420         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 421         struct gendisk *g = scsi->disk;
 422
 423         scsi_remove_host(scsihost);
 424         ide_proc_unregister_driver(drive, scsi->driver);
 425
 426         ide_unregister_region(g);
 427
 428         drive->driver_data = NULL;
 429         g->private_data = NULL;
 430         put_disk(g);
 431
 432         ide_scsi_put(scsi);
 433
 434         drive->scsi = 0;
 435 }
 436
 437 static int ide_scsi_probe(ide_drive_t *);
 438
 439 #ifdef CONFIG_IDE_PROC_FS
 440 static ide_proc_entry_t idescsi_proc[] = {
 441         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 442         { NULL, 0, NULL, NULL }
 443 };
 444 #endif
 445
 446 static ide_driver_t idescsi_driver = {
 447         .gen_driver = {
 448                 .owner          = THIS_MODULE,
 449                 .name           = "ide-scsi",
 450                 .bus            = &ide_bus_type,
 451         },
 452         .probe                  = ide_scsi_probe,
 453         .remove                 = ide_scsi_remove,
 454         .version                = IDESCSI_VERSION,
 455         .media                  = ide_scsi,
 456         .do_request             = idescsi_do_request,
 457         .end_request            = idescsi_end_request,
 458         .error                  = idescsi_atapi_error,
 459 #ifdef CONFIG_IDE_PROC_FS
 460         .proc                   = idescsi_proc,
 461         .settings               = idescsi_settings,
 462 #endif
 463 };
 464
 465 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 466 {
 467         struct gendisk *disk = inode->i_bdev->bd_disk;
 468         struct ide_scsi_obj *scsi;
 469
 470         if (!(scsi = ide_scsi_get(disk)))
 471                 return -ENXIO;
 472
 473         return 0;
 474 }
 475
 476 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 477 {
 478         struct gendisk *disk = inode->i_bdev->bd_disk;
 479         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 480
 481         ide_scsi_put(scsi);
 482
 483         return 0;
 484 }
 485
 486 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 487                         unsigned int cmd, unsigned long arg)
 488 {
 489         struct block_device *bdev = inode->i_bdev;
 490         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 491         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 492 }
 493
 494 static struct block_device_operations idescsi_ops = {
 495         .owner          = THIS_MODULE,
 496         .open           = idescsi_ide_open,
 497         .release        = idescsi_ide_release,
 498         .ioctl          = idescsi_ide_ioctl,
 499 };
 500
 501 static int idescsi_slave_configure(struct scsi_device * sdp)
 502 {
 503         /* Configure detected device */
 504         sdp->use_10_for_rw = 1;
 505         sdp->use_10_for_ms = 1;
 506         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 507         return 0;
 508 }
 509
 510 static const char *idescsi_info (struct Scsi_Host *host)
 511 {
 512         return "SCSI host adapter emulation for IDE ATAPI devices";
 513 }
 514
 515 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 516 {
 517         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 518
 519         if (cmd == SG_SET_TRANSFORM) {
 520                 if (arg)
 521                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 522                 else
 523                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 524                 return 0;
 525         } else if (cmd == SG_GET_TRANSFORM)
 526                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 527         return -EINVAL;
 528 }
 529
 530 static int idescsi_queue (struct scsi_cmnd *cmd,
 531                 void (*done)(struct scsi_cmnd *))
 532 {
 533         struct Scsi_Host *host = cmd->device->host;
 534         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 535         ide_drive_t *drive = scsi->drive;
 536         struct request *rq = NULL;
 537         struct ide_atapi_pc *pc = NULL;
 538         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
 539
 540         if (!drive) {
 541                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 542                 goto abort;
 543         }
 544         scsi = drive_to_idescsi(drive);
 545         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 546         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
 547         if (rq == NULL || pc == NULL) {
 548                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 549                 goto abort;
 550         }
 551
 552         memset (pc->c, 0, 12);
 553         pc->flags = 0;
 554         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 555                 pc->flags |= PC_FLAG_WRITING;
 556         pc->rq = rq;
 557         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 558         pc->buf = NULL;
 559         pc->sg = scsi_sglist(cmd);
 560         pc->sg_cnt = scsi_sg_count(cmd);
 561         pc->b_count = 0;
 562         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 563         pc->scsi_cmd = cmd;
 564         pc->done = done;
 565         pc->timeout = jiffies + cmd->request->timeout;
 566
 567         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 568                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 569                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 570                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 571                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 572                         ide_scsi_hex_dump(pc->c, 12);
 573                 }
 574         }
 575
 576         rq->special = (char *) pc;
 577         rq->cmd_type = REQ_TYPE_SPECIAL;
 578         spin_unlock_irq(host->host_lock);
 579         rq->ref_count++;
 580         memcpy(rq->cmd, pc->c, 12);
 581         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 582         spin_lock_irq(host->host_lock);
 583         return 0;
 584 abort:
 585         kfree (pc);
 586         if (rq)
 587                 blk_put_request(rq);
 588         cmd->result = DID_ERROR << 16;
 589         done(cmd);
 590         return 0;
 591 }
 592
 593 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 594 {
 595         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 596         ide_drive_t    *drive = scsi->drive;
 597         int             busy;
 598         int             ret   = FAILED;
 599
 600         struct ide_atapi_pc *pc;
 601
 602         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 603
 604         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 605                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 606
 607         if (!drive) {
 608                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 609                 WARN_ON(1);
 610                 goto no_drive;
 611         }
 612
 613         /* First give it some more time, how much is "right" is hard to say :-( */
 614
 615         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 616         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 617                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 618
 619         spin_lock_irq(&ide_lock);
 620
 621         /* If there is no pc running we're done (our interrupt took care of it) */
 622         pc = drive->pc;
 623         if (pc == NULL) {
 624                 ret = SUCCESS;
 625                 goto ide_unlock;
 626         }
 627
 628         /* It's somewhere in flight. Does ide subsystem agree? */
 629         if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 630             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
 631                 /*
 632                  * FIXME - not sure this condition can ever occur
 633                  */
 634                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 635
 636                 if (blk_sense_request(pc->rq))
 637                         kfree(pc->buf);
 638                 /* we need to call blk_put_request twice. */
 639                 blk_put_request(pc->rq);
 640                 blk_put_request(pc->rq);
 641                 kfree(pc);
 642                 drive->pc = NULL;
 643
 644                 ret = SUCCESS;
 645         }
 646
 647 ide_unlock:
 648         spin_unlock_irq(&ide_lock);
 649 no_drive:
 650         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 651                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 652
 653         return ret;
 654 }
 655
 656 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 657 {
 658         struct request *req;
 659         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 660         ide_drive_t    *drive = scsi->drive;
 661         int             ready = 0;
 662         int             ret   = SUCCESS;
 663
 664         struct ide_atapi_pc *pc;
 665
 666         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 667
 668         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 669                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 670
 671         if (!drive) {
 672                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 673                 WARN_ON(1);
 674                 return FAILED;
 675         }
 676
 677         spin_lock_irq(cmd->device->host->host_lock);
 678         spin_lock(&ide_lock);
 679
 680         pc = drive->pc;
 681
 682         if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 683                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 684                 spin_unlock(&ide_lock);
 685                 spin_unlock_irq(cmd->device->host->host_lock);
 686                 return FAILED;
 687         }
 688
 689         /* kill current request */
 690         if (__blk_end_request(req, -EIO, 0))
 691                 BUG();
 692         if (blk_sense_request(req))
 693                 kfree(pc->buf);
 694         kfree(pc);
 695         drive->pc = NULL;
 696         blk_put_request(req);
 697
 698         /* now nuke the drive queue */
 699         while ((req = elv_next_request(drive->queue))) {
 700                 if (__blk_end_request(req, -EIO, 0))
 701                         BUG();
 702         }
 703
 704         HWGROUP(drive)->rq = NULL;
 705         HWGROUP(drive)->handler = NULL;
 706         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 707         spin_unlock(&ide_lock);
 708
 709         ide_do_reset(drive);
 710
 711         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 712
 713         do {
 714                 spin_unlock_irq(cmd->device->host->host_lock);
 715                 msleep(50);
 716                 spin_lock_irq(cmd->device->host->host_lock);
 717         } while ( HWGROUP(drive)->handler );
 718
 719         ready = drive_is_ready(drive);
 720         HWGROUP(drive)->busy--;
 721         if (!ready) {
 722                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 723                 ret = FAILED;
 724         }
 725
 726         spin_unlock_irq(cmd->device->host->host_lock);
 727         return ret;
 728 }
 729
 730 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 731                 sector_t capacity, int *parm)
 732 {
 733         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 734         ide_drive_t *drive = idescsi->drive;
 735
 736         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 737                 parm[0] = drive->bios_head;
 738                 parm[1] = drive->bios_sect;
 739                 parm[2] = drive->bios_cyl;
 740         }
 741         return 0;
 742 }
 743
 744 static struct scsi_host_template idescsi_template = {
 745         .module                 = THIS_MODULE,
 746         .name                   = "idescsi",
 747         .info                   = idescsi_info,
 748         .slave_configure        = idescsi_slave_configure,
 749         .ioctl                  = idescsi_ioctl,
 750         .queuecommand           = idescsi_queue,
 751         .eh_abort_handler       = idescsi_eh_abort,
 752         .eh_host_reset_handler  = idescsi_eh_reset,
 753         .bios_param             = idescsi_bios,
 754         .can_queue              = 40,
 755         .this_id                = -1,
 756         .sg_tablesize           = 256,
 757         .cmd_per_lun            = 5,
 758         .max_sectors            = 128,
 759         .use_clustering         = DISABLE_CLUSTERING,
 760         .emulated               = 1,
 761         .proc_name              = "ide-scsi",
 762 };
 763
 764 static int ide_scsi_probe(ide_drive_t *drive)
 765 {
 766         idescsi_scsi_t *idescsi;
 767         struct Scsi_Host *host;
 768         struct gendisk *g;
 769         static int warned;
 770         int err = -ENOMEM;
 771         u16 last_lun;
 772
 773         if (!warned && drive->media == ide_cdrom) {
 774                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 775                 warned = 1;
 776         }
 777
 778         if (idescsi_nocd && drive->media == ide_cdrom)
 779                 return -ENODEV;
 780
 781         if (!strstr("ide-scsi", drive->driver_req) ||
 782             drive->media == ide_disk ||
 783             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 784                 return -ENODEV;
 785
 786         drive->scsi = 1;
 787
 788         g = alloc_disk(1 << PARTN_BITS);
 789         if (!g)
 790                 goto out_host_put;
 791
 792         ide_init_disk(g, drive);
 793
 794         host->max_id = 1;
 795
 796         last_lun = drive->id[ATA_ID_LAST_LUN];
 797         if (last_lun)
 798                 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
 799
 800         if ((last_lun & 7) != 7)
 801                 host->max_lun = (last_lun & 7) + 1;
 802         else
 803                 host->max_lun = 1;
 804
 805         drive->driver_data = host;
 806         idescsi = scsihost_to_idescsi(host);
 807         idescsi->drive = drive;
 808         idescsi->driver = &idescsi_driver;
 809         idescsi->host = host;
 810         idescsi->disk = g;
 811         g->private_data = &idescsi->driver;
 812         err = 0;
 813         idescsi_setup(drive, idescsi);
 814         g->fops = &idescsi_ops;
 815         ide_register_region(g);
 816         err = scsi_add_host(host, &drive->gendev);
 817         if (!err) {
 818                 scsi_scan_host(host);
 819                 return 0;
 820         }
 821         /* fall through on error */
 822         ide_unregister_region(g);
 823         ide_proc_unregister_driver(drive, &idescsi_driver);
 824
 825         put_disk(g);
 826 out_host_put:
 827         drive->scsi = 0;
 828         scsi_host_put(host);
 829         return err;
 830 }
 831
 832 static int __init init_idescsi_module(void)
 833 {
 834         return driver_register(&idescsi_driver.gen_driver);
 835 }
 836
 837 static void __exit exit_idescsi_module(void)
 838 {
 839         driver_unregister(&idescsi_driver.gen_driver);
 840 }
 841
 842 module_param(idescsi_nocd, int, 0600);
 843 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 844 module_init(init_idescsi_module);
 845 module_exit(exit_idescsi_module);
 846 MODULE_LICENSE("GPL");