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