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/hdreg.h>
  44 #include <linux/slab.h>
  45 #include <linux/ide.h>
  46 #include <linux/scatterlist.h>
  47 #include <linux/delay.h>
  48 #include <linux/mutex.h>
  49 #include <linux/bitops.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/uaccess.h>
  53
  54 #include <scsi/scsi.h>
  55 #include <scsi/scsi_cmnd.h>
  56 #include <scsi/scsi_device.h>
  57 #include <scsi/scsi_host.h>
  58 #include <scsi/scsi_tcq.h>
  59 #include <scsi/sg.h>
  60
  61 #define IDESCSI_DEBUG_LOG               0
  62
  63 #if IDESCSI_DEBUG_LOG
  64 #define debug_log(fmt, args...) \
  65         printk(KERN_INFO "ide-scsi: " fmt, ## args)
  66 #else
  67 #define debug_log(fmt, args...) do {} while (0)
  68 #endif
  69
  70 /*
  71  *      SCSI command transformation layer
  72  */
  73 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  74
  75 /*
  76  *      Log flags
  77  */
  78 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  79
  80 typedef struct ide_scsi_obj {
  81         ide_drive_t             *drive;
  82         ide_driver_t            *driver;
  83         struct gendisk          *disk;
  84         struct Scsi_Host        *host;
  85
  86         struct ide_atapi_pc *pc;                /* Current packet command */
  87         unsigned long transform;                /* SCSI cmd translation layer */
  88         unsigned long log;                      /* log flags */
  89 } idescsi_scsi_t;
  90
  91 static DEFINE_MUTEX(idescsi_ref_mutex);
  92 /* Set by module param to skip cd */
  93 static int idescsi_nocd;
  94
  95 #define ide_scsi_g(disk) \
  96         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  97
  98 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
  99 {
 100         struct ide_scsi_obj *scsi = NULL;
 101
 102         mutex_lock(&idescsi_ref_mutex);
 103         scsi = ide_scsi_g(disk);
 104         if (scsi) {
 105                 scsi_host_get(scsi->host);
 106                 if (ide_device_get(scsi->drive)) {
 107                         scsi_host_put(scsi->host);
 108                         scsi = NULL;
 109                 }
 110         }
 111         mutex_unlock(&idescsi_ref_mutex);
 112         return scsi;
 113 }
 114
 115 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 116 {
 117         mutex_lock(&idescsi_ref_mutex);
 118         ide_device_put(scsi->drive);
 119         scsi_host_put(scsi->host);
 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 /*
 134  *      PIO data transfer routine using the scatter gather table.
 135  */
 136 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 137                                 unsigned int bcount, int write)
 138 {
 139         ide_hwif_t *hwif = drive->hwif;
 140         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 141         xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
 142         char *buf;
 143         int count;
 144
 145         while (bcount) {
 146                 count = min(pc->sg->length - pc->b_count, bcount);
 147                 if (PageHighMem(sg_page(pc->sg))) {
 148                         unsigned long flags;
 149
 150                         local_irq_save(flags);
 151                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 152                                           pc->sg->offset;
 153                         xf(drive, NULL, buf + pc->b_count, count);
 154                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 155                         local_irq_restore(flags);
 156                 } else {
 157                         buf = sg_virt(pc->sg);
 158                         xf(drive, NULL, buf + pc->b_count, count);
 159                 }
 160                 bcount -= count; pc->b_count += count;
 161                 if (pc->b_count == pc->sg->length) {
 162                         if (!--pc->sg_cnt)
 163                                 break;
 164                         pc->sg = sg_next(pc->sg);
 165                         pc->b_count = 0;
 166                 }
 167         }
 168
 169         if (bcount) {
 170                 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
 171                                 drive->name, write ? "padding with zeros"
 172                                                    : "discarding data");
 173                 ide_pad_transfer(drive, write, bcount);
 174         }
 175 }
 176
 177 static void ide_scsi_hex_dump(u8 *data, int len)
 178 {
 179         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 180 }
 181
 182 static int idescsi_end_request(ide_drive_t *, int, int);
 183
 184 static void ide_scsi_callback(ide_drive_t *drive)
 185 {
 186         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 187         struct ide_atapi_pc *pc = scsi->pc;
 188
 189         if (pc->flags & PC_FLAG_TIMEDOUT)
 190                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 191                           pc->scsi_cmd->serial_number, jiffies);
 192                 /* end this request now - scsi should retry it*/
 193         else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 194                 printk(KERN_INFO "Packet command completed, %d bytes"
 195                                  " transferred\n", pc->xferred);
 196
 197         idescsi_end_request(drive, 1, 0);
 198 }
 199
 200 static int idescsi_check_condition(ide_drive_t *drive,
 201                 struct request *failed_cmd)
 202 {
 203         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 204         struct ide_atapi_pc   *pc;
 205         struct request *rq;
 206         u8             *buf;
 207
 208         /* stuff a sense request in front of our current request */
 209         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 210         rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
 211         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 212         if (!pc || !rq || !buf) {
 213                 kfree(buf);
 214                 if (rq)
 215                         blk_put_request(rq);
 216                 kfree(pc);
 217                 return -ENOMEM;
 218         }
 219         rq->special = (char *) pc;
 220         pc->rq = rq;
 221         pc->buf = buf;
 222         pc->c[0] = REQUEST_SENSE;
 223         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 224         rq->cmd_type = REQ_TYPE_SENSE;
 225         rq->cmd_flags |= REQ_PREEMPT;
 226         pc->timeout = jiffies + WAIT_READY;
 227         /* NOTE! Save the failed packet command in "rq->buffer" */
 228         rq->buffer = (void *) failed_cmd->special;
 229         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 230         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 231                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 232                 ide_scsi_hex_dump(pc->c, 6);
 233         }
 234         rq->rq_disk = scsi->disk;
 235         rq->ref_count++;
 236         memcpy(rq->cmd, pc->c, 12);
 237         ide_do_drive_cmd(drive, rq);
 238         return 0;
 239 }
 240
 241 static ide_startstop_t
 242 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 243 {
 244         ide_hwif_t *hwif = drive->hwif;
 245
 246         if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
 247                 /* force an abort */
 248                 hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
 249
 250         rq->errors++;
 251
 252         idescsi_end_request(drive, 0, 0);
 253
 254         return ide_stopped;
 255 }
 256
 257 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 258 {
 259         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 260         struct request *rq = HWGROUP(drive)->rq;
 261         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 262         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 263         struct Scsi_Host *host;
 264         int errors = rq->errors;
 265         unsigned long flags;
 266
 267         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 268                 ide_end_request(drive, uptodate, nrsecs);
 269                 return 0;
 270         }
 271         ide_end_drive_cmd (drive, 0, 0);
 272         if (blk_sense_request(rq)) {
 273                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 274                 if (log) {
 275                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 276                         ide_scsi_hex_dump(pc->buf, 16);
 277                 }
 278                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 279                         SCSI_SENSE_BUFFERSIZE);
 280                 kfree(pc->buf);
 281                 kfree(pc);
 282                 blk_put_request(rq);
 283                 pc = opc;
 284                 rq = pc->rq;
 285                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 286                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 287                                   DID_TIME_OUT :
 288                                   DID_OK) << 16);
 289         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 290                 if (log)
 291                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 292                                         drive->name, pc->scsi_cmd->serial_number);
 293                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 294         } else if (errors >= ERROR_MAX) {
 295                 pc->scsi_cmd->result = DID_ERROR << 16;
 296                 if (log)
 297                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 298         } else if (errors) {
 299                 if (log)
 300                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 301                 if (!idescsi_check_condition(drive, rq))
 302                         /* we started a request sense, so we'll be back, exit for now */
 303                         return 0;
 304                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 305         } else {
 306                 pc->scsi_cmd->result = DID_OK << 16;
 307         }
 308         host = pc->scsi_cmd->device->host;
 309         spin_lock_irqsave(host->host_lock, flags);
 310         pc->done(pc->scsi_cmd);
 311         spin_unlock_irqrestore(host->host_lock, flags);
 312         kfree(pc);
 313         blk_put_request(rq);
 314         scsi->pc = NULL;
 315         return 0;
 316 }
 317
 318 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 319 {
 320         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 321 }
 322
 323 static int idescsi_expiry(ide_drive_t *drive)
 324 {
 325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 326         struct ide_atapi_pc   *pc   = scsi->pc;
 327
 328         debug_log("%s called for %lu at %lu\n", __func__,
 329                   pc->scsi_cmd->serial_number, jiffies);
 330
 331         pc->flags |= PC_FLAG_TIMEDOUT;
 332
 333         return 0;                                       /* we do not want the ide subsystem to retry */
 334 }
 335
 336 /*
 337  *      Our interrupt handler.
 338  */
 339 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 340 {
 341         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 342         struct ide_atapi_pc *pc = scsi->pc;
 343
 344         return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
 345                            idescsi_expiry, NULL, NULL, NULL,
 346                            ide_scsi_io_buffers);
 347 }
 348
 349 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 350 {
 351         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 352
 353         return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
 354                                get_timeout(scsi->pc), idescsi_expiry);
 355 }
 356
 357 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 358 {
 359         switch (pc->c[0]) {
 360                 case READ_6: case READ_10: case READ_12:
 361                         pc->flags &= ~PC_FLAG_WRITING;
 362                         return 0;
 363                 case WRITE_6: case WRITE_10: case WRITE_12:
 364                         pc->flags |= PC_FLAG_WRITING;
 365                         return 0;
 366                 default:
 367                         return 1;
 368         }
 369 }
 370
 371 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 372 {
 373         ide_hwif_t *hwif = drive->hwif;
 374         struct scatterlist *sg, *scsi_sg;
 375         int segments;
 376
 377         if (!pc->req_xfer || pc->req_xfer % 1024)
 378                 return 1;
 379
 380         if (idescsi_set_direction(pc))
 381                 return 1;
 382
 383         sg = hwif->sg_table;
 384         scsi_sg = scsi_sglist(pc->scsi_cmd);
 385         segments = scsi_sg_count(pc->scsi_cmd);
 386
 387         if (segments > hwif->sg_max_nents)
 388                 return 1;
 389
 390         hwif->sg_nents = segments;
 391         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 392
 393         return 0;
 394 }
 395
 396 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 397                 struct ide_atapi_pc *pc)
 398 {
 399         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 400
 401         /* Set the current packet command */
 402         scsi->pc = pc;
 403
 404         return ide_issue_pc(drive, pc, idescsi_transfer_pc,
 405                             get_timeout(pc), idescsi_expiry);
 406 }
 407
 408 /*
 409  *      idescsi_do_request is our request handling function.
 410  */
 411 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 412 {
 413         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 414                   rq->cmd[0], rq->errors);
 415         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 416                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 417
 418         if (blk_sense_request(rq) || blk_special_request(rq)) {
 419                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 420
 421                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 422                         pc->flags |= PC_FLAG_DMA_OK;
 423
 424                 return idescsi_issue_pc(drive, pc);
 425         }
 426         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 427         idescsi_end_request (drive, 0, 0);
 428         return ide_stopped;
 429 }
 430
 431 #ifdef CONFIG_IDE_PROC_FS
 432 static void idescsi_add_settings(ide_drive_t *drive)
 433 {
 434         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 435
 436 /*
 437  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 438  */
 439         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 440         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 441         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 442         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 443         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 444 }
 445 #else
 446 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 447 #endif
 448
 449 /*
 450  *      Driver initialization.
 451  */
 452 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 453 {
 454         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 455                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
 456         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 457 #if IDESCSI_DEBUG_LOG
 458         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 459 #endif /* IDESCSI_DEBUG_LOG */
 460
 461         drive->pc_callback = ide_scsi_callback;
 462
 463         idescsi_add_settings(drive);
 464 }
 465
 466 static void ide_scsi_remove(ide_drive_t *drive)
 467 {
 468         struct Scsi_Host *scsihost = drive->driver_data;
 469         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 470         struct gendisk *g = scsi->disk;
 471
 472         scsi_remove_host(scsihost);
 473         ide_proc_unregister_driver(drive, scsi->driver);
 474
 475         ide_unregister_region(g);
 476
 477         drive->driver_data = NULL;
 478         g->private_data = NULL;
 479         put_disk(g);
 480
 481         ide_scsi_put(scsi);
 482
 483         drive->scsi = 0;
 484 }
 485
 486 static int ide_scsi_probe(ide_drive_t *);
 487
 488 #ifdef CONFIG_IDE_PROC_FS
 489 static ide_proc_entry_t idescsi_proc[] = {
 490         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 491         { NULL, 0, NULL, NULL }
 492 };
 493 #endif
 494
 495 static ide_driver_t idescsi_driver = {
 496         .gen_driver = {
 497                 .owner          = THIS_MODULE,
 498                 .name           = "ide-scsi",
 499                 .bus            = &ide_bus_type,
 500         },
 501         .probe                  = ide_scsi_probe,
 502         .remove                 = ide_scsi_remove,
 503         .version                = IDESCSI_VERSION,
 504         .media                  = ide_scsi,
 505         .supports_dsc_overlap   = 0,
 506         .do_request             = idescsi_do_request,
 507         .end_request            = idescsi_end_request,
 508         .error                  = idescsi_atapi_error,
 509 #ifdef CONFIG_IDE_PROC_FS
 510         .proc                   = idescsi_proc,
 511 #endif
 512 };
 513
 514 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 515 {
 516         struct gendisk *disk = inode->i_bdev->bd_disk;
 517         struct ide_scsi_obj *scsi;
 518
 519         if (!(scsi = ide_scsi_get(disk)))
 520                 return -ENXIO;
 521
 522         return 0;
 523 }
 524
 525 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 526 {
 527         struct gendisk *disk = inode->i_bdev->bd_disk;
 528         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 529
 530         ide_scsi_put(scsi);
 531
 532         return 0;
 533 }
 534
 535 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 536                         unsigned int cmd, unsigned long arg)
 537 {
 538         struct block_device *bdev = inode->i_bdev;
 539         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 540         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 541 }
 542
 543 static struct block_device_operations idescsi_ops = {
 544         .owner          = THIS_MODULE,
 545         .open           = idescsi_ide_open,
 546         .release        = idescsi_ide_release,
 547         .ioctl          = idescsi_ide_ioctl,
 548 };
 549
 550 static int idescsi_slave_configure(struct scsi_device * sdp)
 551 {
 552         /* Configure detected device */
 553         sdp->use_10_for_rw = 1;
 554         sdp->use_10_for_ms = 1;
 555         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 556         return 0;
 557 }
 558
 559 static const char *idescsi_info (struct Scsi_Host *host)
 560 {
 561         return "SCSI host adapter emulation for IDE ATAPI devices";
 562 }
 563
 564 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 565 {
 566         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 567
 568         if (cmd == SG_SET_TRANSFORM) {
 569                 if (arg)
 570                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 571                 else
 572                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 573                 return 0;
 574         } else if (cmd == SG_GET_TRANSFORM)
 575                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 576         return -EINVAL;
 577 }
 578
 579 static int idescsi_queue (struct scsi_cmnd *cmd,
 580                 void (*done)(struct scsi_cmnd *))
 581 {
 582         struct Scsi_Host *host = cmd->device->host;
 583         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 584         ide_drive_t *drive = scsi->drive;
 585         struct request *rq = NULL;
 586         struct ide_atapi_pc *pc = NULL;
 587         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
 588
 589         if (!drive) {
 590                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 591                 goto abort;
 592         }
 593         scsi = drive_to_idescsi(drive);
 594         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 595         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
 596         if (rq == NULL || pc == NULL) {
 597                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 598                 goto abort;
 599         }
 600
 601         memset (pc->c, 0, 12);
 602         pc->flags = 0;
 603         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 604                 pc->flags |= PC_FLAG_WRITING;
 605         pc->rq = rq;
 606         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 607         pc->buf = NULL;
 608         pc->sg = scsi_sglist(cmd);
 609         pc->sg_cnt = scsi_sg_count(cmd);
 610         pc->b_count = 0;
 611         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 612         pc->scsi_cmd = cmd;
 613         pc->done = done;
 614         pc->timeout = jiffies + cmd->timeout_per_command;
 615
 616         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 617                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 618                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 619                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 620                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 621                         ide_scsi_hex_dump(pc->c, 12);
 622                 }
 623         }
 624
 625         rq->special = (char *) pc;
 626         rq->cmd_type = REQ_TYPE_SPECIAL;
 627         spin_unlock_irq(host->host_lock);
 628         rq->ref_count++;
 629         memcpy(rq->cmd, pc->c, 12);
 630         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 631         spin_lock_irq(host->host_lock);
 632         return 0;
 633 abort:
 634         kfree (pc);
 635         if (rq)
 636                 blk_put_request(rq);
 637         cmd->result = DID_ERROR << 16;
 638         done(cmd);
 639         return 0;
 640 }
 641
 642 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 643 {
 644         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 645         ide_drive_t    *drive = scsi->drive;
 646         int             busy;
 647         int             ret   = FAILED;
 648
 649         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 650
 651         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 652                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 653
 654         if (!drive) {
 655                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 656                 WARN_ON(1);
 657                 goto no_drive;
 658         }
 659
 660         /* First give it some more time, how much is "right" is hard to say :-( */
 661
 662         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 663         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 664                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 665
 666         spin_lock_irq(&ide_lock);
 667
 668         /* If there is no pc running we're done (our interrupt took care of it) */
 669         if (!scsi->pc) {
 670                 ret = SUCCESS;
 671                 goto ide_unlock;
 672         }
 673
 674         /* It's somewhere in flight. Does ide subsystem agree? */
 675         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 676             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 677                 /*
 678                  * FIXME - not sure this condition can ever occur
 679                  */
 680                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 681
 682                 if (blk_sense_request(scsi->pc->rq))
 683                         kfree(scsi->pc->buf);
 684                 /* we need to call blk_put_request twice. */
 685                 blk_put_request(scsi->pc->rq);
 686                 blk_put_request(scsi->pc->rq);
 687                 kfree(scsi->pc);
 688                 scsi->pc = NULL;
 689
 690                 ret = SUCCESS;
 691         }
 692
 693 ide_unlock:
 694         spin_unlock_irq(&ide_lock);
 695 no_drive:
 696         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 697                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 698
 699         return ret;
 700 }
 701
 702 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 703 {
 704         struct request *req;
 705         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 706         ide_drive_t    *drive = scsi->drive;
 707         int             ready = 0;
 708         int             ret   = SUCCESS;
 709
 710         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 711
 712         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 713                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 714
 715         if (!drive) {
 716                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 717                 WARN_ON(1);
 718                 return FAILED;
 719         }
 720
 721         spin_lock_irq(cmd->device->host->host_lock);
 722         spin_lock(&ide_lock);
 723
 724         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 725                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 726                 spin_unlock(&ide_lock);
 727                 spin_unlock_irq(cmd->device->host->host_lock);
 728                 return FAILED;
 729         }
 730
 731         /* kill current request */
 732         if (__blk_end_request(req, -EIO, 0))
 733                 BUG();
 734         if (blk_sense_request(req))
 735                 kfree(scsi->pc->buf);
 736         kfree(scsi->pc);
 737         scsi->pc = NULL;
 738         blk_put_request(req);
 739
 740         /* now nuke the drive queue */
 741         while ((req = elv_next_request(drive->queue))) {
 742                 if (__blk_end_request(req, -EIO, 0))
 743                         BUG();
 744         }
 745
 746         HWGROUP(drive)->rq = NULL;
 747         HWGROUP(drive)->handler = NULL;
 748         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 749         spin_unlock(&ide_lock);
 750
 751         ide_do_reset(drive);
 752
 753         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 754
 755         do {
 756                 spin_unlock_irq(cmd->device->host->host_lock);
 757                 msleep(50);
 758                 spin_lock_irq(cmd->device->host->host_lock);
 759         } while ( HWGROUP(drive)->handler );
 760
 761         ready = drive_is_ready(drive);
 762         HWGROUP(drive)->busy--;
 763         if (!ready) {
 764                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 765                 ret = FAILED;
 766         }
 767
 768         spin_unlock_irq(cmd->device->host->host_lock);
 769         return ret;
 770 }
 771
 772 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 773                 sector_t capacity, int *parm)
 774 {
 775         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 776         ide_drive_t *drive = idescsi->drive;
 777
 778         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 779                 parm[0] = drive->bios_head;
 780                 parm[1] = drive->bios_sect;
 781                 parm[2] = drive->bios_cyl;
 782         }
 783         return 0;
 784 }
 785
 786 static struct scsi_host_template idescsi_template = {
 787         .module                 = THIS_MODULE,
 788         .name                   = "idescsi",
 789         .info                   = idescsi_info,
 790         .slave_configure        = idescsi_slave_configure,
 791         .ioctl                  = idescsi_ioctl,
 792         .queuecommand           = idescsi_queue,
 793         .eh_abort_handler       = idescsi_eh_abort,
 794         .eh_host_reset_handler  = idescsi_eh_reset,
 795         .bios_param             = idescsi_bios,
 796         .can_queue              = 40,
 797         .this_id                = -1,
 798         .sg_tablesize           = 256,
 799         .cmd_per_lun            = 5,
 800         .max_sectors            = 128,
 801         .use_clustering         = DISABLE_CLUSTERING,
 802         .emulated               = 1,
 803         .proc_name              = "ide-scsi",
 804 };
 805
 806 static int ide_scsi_probe(ide_drive_t *drive)
 807 {
 808         idescsi_scsi_t *idescsi;
 809         struct Scsi_Host *host;
 810         struct gendisk *g;
 811         static int warned;
 812         int err = -ENOMEM;
 813
 814         if (!warned && drive->media == ide_cdrom) {
 815                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 816                 warned = 1;
 817         }
 818
 819         if (idescsi_nocd && drive->media == ide_cdrom)
 820                 return -ENODEV;
 821
 822         if (!strstr("ide-scsi", drive->driver_req) ||
 823             !drive->present ||
 824             drive->media == ide_disk ||
 825             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 826                 return -ENODEV;
 827
 828         drive->scsi = 1;
 829
 830         g = alloc_disk(1 << PARTN_BITS);
 831         if (!g)
 832                 goto out_host_put;
 833
 834         ide_init_disk(g, drive);
 835
 836         host->max_id = 1;
 837
 838         if (drive->id->last_lun)
 839                 debug_log("%s: id->last_lun=%u\n", drive->name,
 840                           drive->id->last_lun);
 841
 842         if ((drive->id->last_lun & 0x7) != 7)
 843                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 844         else
 845                 host->max_lun = 1;
 846
 847         drive->driver_data = host;
 848         idescsi = scsihost_to_idescsi(host);
 849         idescsi->drive = drive;
 850         idescsi->driver = &idescsi_driver;
 851         idescsi->host = host;
 852         idescsi->disk = g;
 853         g->private_data = &idescsi->driver;
 854         ide_proc_register_driver(drive, &idescsi_driver);
 855         err = 0;
 856         idescsi_setup(drive, idescsi);
 857         g->fops = &idescsi_ops;
 858         ide_register_region(g);
 859         err = scsi_add_host(host, &drive->gendev);
 860         if (!err) {
 861                 scsi_scan_host(host);
 862                 return 0;
 863         }
 864         /* fall through on error */
 865         ide_unregister_region(g);
 866         ide_proc_unregister_driver(drive, &idescsi_driver);
 867
 868         put_disk(g);
 869 out_host_put:
 870         drive->scsi = 0;
 871         scsi_host_put(host);
 872         return err;
 873 }
 874
 875 static int __init init_idescsi_module(void)
 876 {
 877         return driver_register(&idescsi_driver.gen_driver);
 878 }
 879
 880 static void __exit exit_idescsi_module(void)
 881 {
 882         driver_unregister(&idescsi_driver.gen_driver);
 883 }
 884
 885 module_param(idescsi_nocd, int, 0600);
 886 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 887 module_init(init_idescsi_module);
 888 module_exit(exit_idescsi_module);
 889 MODULE_LICENSE("GPL");