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