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