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                 if (ide_device_get(scsi->drive))
 106                         scsi = NULL;
 107                 else
 108                         scsi_host_get(scsi->host);
 109         }
 110         mutex_unlock(&idescsi_ref_mutex);
 111         return scsi;
 112 }
 113
 114 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 115 {
 116         ide_drive_t *drive = scsi->drive;
 117
 118         mutex_lock(&idescsi_ref_mutex);
 119         scsi_host_put(scsi->host);
 120         ide_device_put(drive);
 121         mutex_unlock(&idescsi_ref_mutex);
 122 }
 123
 124 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 125 {
 126         return (idescsi_scsi_t*) (&host[1]);
 127 }
 128
 129 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 130 {
 131         return scsihost_to_idescsi(ide_drive->driver_data);
 132 }
 133
 134 /*
 135  *      PIO data transfer routine using the scatter gather table.
 136  */
 137 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 138                                 unsigned int bcount, int write)
 139 {
 140         ide_hwif_t *hwif = drive->hwif;
 141         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 142         xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
 143         char *buf;
 144         int count;
 145
 146         while (bcount) {
 147                 count = min(pc->sg->length - pc->b_count, bcount);
 148                 if (PageHighMem(sg_page(pc->sg))) {
 149                         unsigned long flags;
 150
 151                         local_irq_save(flags);
 152                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 153                                           pc->sg->offset;
 154                         xf(drive, NULL, buf + pc->b_count, count);
 155                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 156                         local_irq_restore(flags);
 157                 } else {
 158                         buf = sg_virt(pc->sg);
 159                         xf(drive, NULL, buf + pc->b_count, count);
 160                 }
 161                 bcount -= count; pc->b_count += count;
 162                 if (pc->b_count == pc->sg->length) {
 163                         if (!--pc->sg_cnt)
 164                                 break;
 165                         pc->sg = sg_next(pc->sg);
 166                         pc->b_count = 0;
 167                 }
 168         }
 169
 170         if (bcount) {
 171                 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
 172                                 drive->name, write ? "padding with zeros"
 173                                                    : "discarding data");
 174                 ide_pad_transfer(drive, write, bcount);
 175         }
 176 }
 177
 178 static void ide_scsi_hex_dump(u8 *data, int len)
 179 {
 180         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 181 }
 182
 183 static int idescsi_end_request(ide_drive_t *, int, int);
 184
 185 static void ide_scsi_callback(ide_drive_t *drive)
 186 {
 187         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 188         struct ide_atapi_pc *pc = scsi->pc;
 189
 190         if (pc->flags & PC_FLAG_TIMEDOUT)
 191                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 192                           pc->scsi_cmd->serial_number, jiffies);
 193                 /* end this request now - scsi should retry it*/
 194         else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 195                 printk(KERN_INFO "Packet command completed, %d bytes"
 196                                  " transferred\n", pc->xferred);
 197
 198         idescsi_end_request(drive, 1, 0);
 199 }
 200
 201 static int idescsi_check_condition(ide_drive_t *drive,
 202                 struct request *failed_cmd)
 203 {
 204         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 205         struct ide_atapi_pc   *pc;
 206         struct request *rq;
 207         u8             *buf;
 208
 209         /* stuff a sense request in front of our current request */
 210         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 211         rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
 212         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 213         if (!pc || !rq || !buf) {
 214                 kfree(buf);
 215                 if (rq)
 216                         blk_put_request(rq);
 217                 kfree(pc);
 218                 return -ENOMEM;
 219         }
 220         rq->special = (char *) pc;
 221         pc->rq = rq;
 222         pc->buf = buf;
 223         pc->c[0] = REQUEST_SENSE;
 224         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 225         rq->cmd_type = REQ_TYPE_SENSE;
 226         rq->cmd_flags |= REQ_PREEMPT;
 227         pc->timeout = jiffies + WAIT_READY;
 228         /* NOTE! Save the failed packet command in "rq->buffer" */
 229         rq->buffer = (void *) failed_cmd->special;
 230         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 231         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 232                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 233                 ide_scsi_hex_dump(pc->c, 6);
 234         }
 235         rq->rq_disk = scsi->disk;
 236         rq->ref_count++;
 237         memcpy(rq->cmd, pc->c, 12);
 238         ide_do_drive_cmd(drive, rq);
 239         return 0;
 240 }
 241
 242 static ide_startstop_t
 243 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 244 {
 245         ide_hwif_t *hwif = drive->hwif;
 246
 247         if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
 248                 /* force an abort */
 249                 hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
 250
 251         rq->errors++;
 252
 253         idescsi_end_request(drive, 0, 0);
 254
 255         return ide_stopped;
 256 }
 257
 258 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 259 {
 260         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 261         struct request *rq = HWGROUP(drive)->rq;
 262         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 263         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 264         struct Scsi_Host *host;
 265         int errors = rq->errors;
 266         unsigned long flags;
 267
 268         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 269                 ide_end_request(drive, uptodate, nrsecs);
 270                 return 0;
 271         }
 272         ide_end_drive_cmd (drive, 0, 0);
 273         if (blk_sense_request(rq)) {
 274                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 275                 if (log) {
 276                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 277                         ide_scsi_hex_dump(pc->buf, 16);
 278                 }
 279                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 280                         SCSI_SENSE_BUFFERSIZE);
 281                 kfree(pc->buf);
 282                 kfree(pc);
 283                 blk_put_request(rq);
 284                 pc = opc;
 285                 rq = pc->rq;
 286                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 287                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 288                                   DID_TIME_OUT :
 289                                   DID_OK) << 16);
 290         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 291                 if (log)
 292                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 293                                         drive->name, pc->scsi_cmd->serial_number);
 294                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 295         } else if (errors >= ERROR_MAX) {
 296                 pc->scsi_cmd->result = DID_ERROR << 16;
 297                 if (log)
 298                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 299         } else if (errors) {
 300                 if (log)
 301                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 302                 if (!idescsi_check_condition(drive, rq))
 303                         /* we started a request sense, so we'll be back, exit for now */
 304                         return 0;
 305                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 306         } else {
 307                 pc->scsi_cmd->result = DID_OK << 16;
 308         }
 309         host = pc->scsi_cmd->device->host;
 310         spin_lock_irqsave(host->host_lock, flags);
 311         pc->done(pc->scsi_cmd);
 312         spin_unlock_irqrestore(host->host_lock, flags);
 313         kfree(pc);
 314         blk_put_request(rq);
 315         scsi->pc = NULL;
 316         return 0;
 317 }
 318
 319 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 320 {
 321         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 322 }
 323
 324 static int idescsi_expiry(ide_drive_t *drive)
 325 {
 326         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 327         struct ide_atapi_pc   *pc   = scsi->pc;
 328
 329         debug_log("%s called for %lu at %lu\n", __func__,
 330                   pc->scsi_cmd->serial_number, jiffies);
 331
 332         pc->flags |= PC_FLAG_TIMEDOUT;
 333
 334         return 0;                                       /* we do not want the ide subsystem to retry */
 335 }
 336
 337 /*
 338  *      Our interrupt handler.
 339  */
 340 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 341 {
 342         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 343         struct ide_atapi_pc *pc = scsi->pc;
 344
 345         return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
 346                            idescsi_expiry, NULL, NULL, NULL,
 347                            ide_scsi_io_buffers);
 348 }
 349
 350 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 351 {
 352         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 353
 354         return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
 355                                get_timeout(scsi->pc), idescsi_expiry);
 356 }
 357
 358 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 359 {
 360         switch (pc->c[0]) {
 361                 case READ_6: case READ_10: case READ_12:
 362                         pc->flags &= ~PC_FLAG_WRITING;
 363                         return 0;
 364                 case WRITE_6: case WRITE_10: case WRITE_12:
 365                         pc->flags |= PC_FLAG_WRITING;
 366                         return 0;
 367                 default:
 368                         return 1;
 369         }
 370 }
 371
 372 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 373 {
 374         ide_hwif_t *hwif = drive->hwif;
 375         struct scatterlist *sg, *scsi_sg;
 376         int segments;
 377
 378         if (!pc->req_xfer || pc->req_xfer % 1024)
 379                 return 1;
 380
 381         if (idescsi_set_direction(pc))
 382                 return 1;
 383
 384         sg = hwif->sg_table;
 385         scsi_sg = scsi_sglist(pc->scsi_cmd);
 386         segments = scsi_sg_count(pc->scsi_cmd);
 387
 388         if (segments > hwif->sg_max_nents)
 389                 return 1;
 390
 391         hwif->sg_nents = segments;
 392         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 393
 394         return 0;
 395 }
 396
 397 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 398                 struct ide_atapi_pc *pc)
 399 {
 400         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 401
 402         /* Set the current packet command */
 403         scsi->pc = pc;
 404
 405         return ide_issue_pc(drive, pc, idescsi_transfer_pc,
 406                             get_timeout(pc), idescsi_expiry);
 407 }
 408
 409 /*
 410  *      idescsi_do_request is our request handling function.
 411  */
 412 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 413 {
 414         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 415                   rq->cmd[0], rq->errors);
 416         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 417                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 418
 419         if (blk_sense_request(rq) || blk_special_request(rq)) {
 420                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 421
 422                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 423                         pc->flags |= PC_FLAG_DMA_OK;
 424
 425                 return idescsi_issue_pc(drive, pc);
 426         }
 427         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 428         idescsi_end_request (drive, 0, 0);
 429         return ide_stopped;
 430 }
 431
 432 #ifdef CONFIG_IDE_PROC_FS
 433 static void idescsi_add_settings(ide_drive_t *drive)
 434 {
 435         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 436
 437 /*
 438  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 439  */
 440         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 441         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 442         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 443         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 444         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 445 }
 446 #else
 447 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 448 #endif
 449
 450 /*
 451  *      Driver initialization.
 452  */
 453 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 454 {
 455         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 456                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
 457         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 458 #if IDESCSI_DEBUG_LOG
 459         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 460 #endif /* IDESCSI_DEBUG_LOG */
 461
 462         drive->pc_callback = ide_scsi_callback;
 463
 464         idescsi_add_settings(drive);
 465 }
 466
 467 static void ide_scsi_remove(ide_drive_t *drive)
 468 {
 469         struct Scsi_Host *scsihost = drive->driver_data;
 470         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 471         struct gendisk *g = scsi->disk;
 472
 473         scsi_remove_host(scsihost);
 474         ide_proc_unregister_driver(drive, scsi->driver);
 475
 476         ide_unregister_region(g);
 477
 478         drive->driver_data = NULL;
 479         g->private_data = NULL;
 480         put_disk(g);
 481
 482         ide_scsi_put(scsi);
 483
 484         drive->scsi = 0;
 485 }
 486
 487 static int ide_scsi_probe(ide_drive_t *);
 488
 489 #ifdef CONFIG_IDE_PROC_FS
 490 static ide_proc_entry_t idescsi_proc[] = {
 491         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 492         { NULL, 0, NULL, NULL }
 493 };
 494 #endif
 495
 496 static ide_driver_t idescsi_driver = {
 497         .gen_driver = {
 498                 .owner          = THIS_MODULE,
 499                 .name           = "ide-scsi",
 500                 .bus            = &ide_bus_type,
 501         },
 502         .probe                  = ide_scsi_probe,
 503         .remove                 = ide_scsi_remove,
 504         .version                = IDESCSI_VERSION,
 505         .media                  = ide_scsi,
 506         .supports_dsc_overlap   = 0,
 507         .do_request             = idescsi_do_request,
 508         .end_request            = idescsi_end_request,
 509         .error                  = idescsi_atapi_error,
 510 #ifdef CONFIG_IDE_PROC_FS
 511         .proc                   = idescsi_proc,
 512 #endif
 513 };
 514
 515 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 516 {
 517         struct gendisk *disk = inode->i_bdev->bd_disk;
 518         struct ide_scsi_obj *scsi;
 519
 520         if (!(scsi = ide_scsi_get(disk)))
 521                 return -ENXIO;
 522
 523         return 0;
 524 }
 525
 526 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 527 {
 528         struct gendisk *disk = inode->i_bdev->bd_disk;
 529         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 530
 531         ide_scsi_put(scsi);
 532
 533         return 0;
 534 }
 535
 536 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 537                         unsigned int cmd, unsigned long arg)
 538 {
 539         struct block_device *bdev = inode->i_bdev;
 540         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 541         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 542 }
 543
 544 static struct block_device_operations idescsi_ops = {
 545         .owner          = THIS_MODULE,
 546         .open           = idescsi_ide_open,
 547         .release        = idescsi_ide_release,
 548         .ioctl          = idescsi_ide_ioctl,
 549 };
 550
 551 static int idescsi_slave_configure(struct scsi_device * sdp)
 552 {
 553         /* Configure detected device */
 554         sdp->use_10_for_rw = 1;
 555         sdp->use_10_for_ms = 1;
 556         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 557         return 0;
 558 }
 559
 560 static const char *idescsi_info (struct Scsi_Host *host)
 561 {
 562         return "SCSI host adapter emulation for IDE ATAPI devices";
 563 }
 564
 565 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 566 {
 567         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 568
 569         if (cmd == SG_SET_TRANSFORM) {
 570                 if (arg)
 571                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 572                 else
 573                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 574                 return 0;
 575         } else if (cmd == SG_GET_TRANSFORM)
 576                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 577         return -EINVAL;
 578 }
 579
 580 static int idescsi_queue (struct scsi_cmnd *cmd,
 581                 void (*done)(struct scsi_cmnd *))
 582 {
 583         struct Scsi_Host *host = cmd->device->host;
 584         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 585         ide_drive_t *drive = scsi->drive;
 586         struct request *rq = NULL;
 587         struct ide_atapi_pc *pc = NULL;
 588         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
 589
 590         if (!drive) {
 591                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 592                 goto abort;
 593         }
 594         scsi = drive_to_idescsi(drive);
 595         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 596         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
 597         if (rq == NULL || pc == NULL) {
 598                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 599                 goto abort;
 600         }
 601
 602         memset (pc->c, 0, 12);
 603         pc->flags = 0;
 604         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 605                 pc->flags |= PC_FLAG_WRITING;
 606         pc->rq = rq;
 607         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 608         pc->buf = NULL;
 609         pc->sg = scsi_sglist(cmd);
 610         pc->sg_cnt = scsi_sg_count(cmd);
 611         pc->b_count = 0;
 612         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 613         pc->scsi_cmd = cmd;
 614         pc->done = done;
 615         pc->timeout = jiffies + cmd->request->timeout;
 616
 617         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 618                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 619                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 620                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 621                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 622                         ide_scsi_hex_dump(pc->c, 12);
 623                 }
 624         }
 625
 626         rq->special = (char *) pc;
 627         rq->cmd_type = REQ_TYPE_SPECIAL;
 628         spin_unlock_irq(host->host_lock);
 629         rq->ref_count++;
 630         memcpy(rq->cmd, pc->c, 12);
 631         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 632         spin_lock_irq(host->host_lock);
 633         return 0;
 634 abort:
 635         kfree (pc);
 636         if (rq)
 637                 blk_put_request(rq);
 638         cmd->result = DID_ERROR << 16;
 639         done(cmd);
 640         return 0;
 641 }
 642
 643 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 644 {
 645         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 646         ide_drive_t    *drive = scsi->drive;
 647         int             busy;
 648         int             ret   = FAILED;
 649
 650         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 651
 652         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 653                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 654
 655         if (!drive) {
 656                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 657                 WARN_ON(1);
 658                 goto no_drive;
 659         }
 660
 661         /* First give it some more time, how much is "right" is hard to say :-( */
 662
 663         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 664         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 665                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 666
 667         spin_lock_irq(&ide_lock);
 668
 669         /* If there is no pc running we're done (our interrupt took care of it) */
 670         if (!scsi->pc) {
 671                 ret = SUCCESS;
 672                 goto ide_unlock;
 673         }
 674
 675         /* It's somewhere in flight. Does ide subsystem agree? */
 676         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 677             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 678                 /*
 679                  * FIXME - not sure this condition can ever occur
 680                  */
 681                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 682
 683                 if (blk_sense_request(scsi->pc->rq))
 684                         kfree(scsi->pc->buf);
 685                 /* we need to call blk_put_request twice. */
 686                 blk_put_request(scsi->pc->rq);
 687                 blk_put_request(scsi->pc->rq);
 688                 kfree(scsi->pc);
 689                 scsi->pc = NULL;
 690
 691                 ret = SUCCESS;
 692         }
 693
 694 ide_unlock:
 695         spin_unlock_irq(&ide_lock);
 696 no_drive:
 697         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 698                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 699
 700         return ret;
 701 }
 702
 703 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 704 {
 705         struct request *req;
 706         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 707         ide_drive_t    *drive = scsi->drive;
 708         int             ready = 0;
 709         int             ret   = SUCCESS;
 710
 711         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 712
 713         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 714                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 715
 716         if (!drive) {
 717                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 718                 WARN_ON(1);
 719                 return FAILED;
 720         }
 721
 722         spin_lock_irq(cmd->device->host->host_lock);
 723         spin_lock(&ide_lock);
 724
 725         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 726                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 727                 spin_unlock(&ide_lock);
 728                 spin_unlock_irq(cmd->device->host->host_lock);
 729                 return FAILED;
 730         }
 731
 732         /* kill current request */
 733         if (__blk_end_request(req, -EIO, 0))
 734                 BUG();
 735         if (blk_sense_request(req))
 736                 kfree(scsi->pc->buf);
 737         kfree(scsi->pc);
 738         scsi->pc = NULL;
 739         blk_put_request(req);
 740
 741         /* now nuke the drive queue */
 742         while ((req = elv_next_request(drive->queue))) {
 743                 if (__blk_end_request(req, -EIO, 0))
 744                         BUG();
 745         }
 746
 747         HWGROUP(drive)->rq = NULL;
 748         HWGROUP(drive)->handler = NULL;
 749         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 750         spin_unlock(&ide_lock);
 751
 752         ide_do_reset(drive);
 753
 754         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 755
 756         do {
 757                 spin_unlock_irq(cmd->device->host->host_lock);
 758                 msleep(50);
 759                 spin_lock_irq(cmd->device->host->host_lock);
 760         } while ( HWGROUP(drive)->handler );
 761
 762         ready = drive_is_ready(drive);
 763         HWGROUP(drive)->busy--;
 764         if (!ready) {
 765                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 766                 ret = FAILED;
 767         }
 768
 769         spin_unlock_irq(cmd->device->host->host_lock);
 770         return ret;
 771 }
 772
 773 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 774                 sector_t capacity, int *parm)
 775 {
 776         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 777         ide_drive_t *drive = idescsi->drive;
 778
 779         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 780                 parm[0] = drive->bios_head;
 781                 parm[1] = drive->bios_sect;
 782                 parm[2] = drive->bios_cyl;
 783         }
 784         return 0;
 785 }
 786
 787 static struct scsi_host_template idescsi_template = {
 788         .module                 = THIS_MODULE,
 789         .name                   = "idescsi",
 790         .info                   = idescsi_info,
 791         .slave_configure        = idescsi_slave_configure,
 792         .ioctl                  = idescsi_ioctl,
 793         .queuecommand           = idescsi_queue,
 794         .eh_abort_handler       = idescsi_eh_abort,
 795         .eh_host_reset_handler  = idescsi_eh_reset,
 796         .bios_param             = idescsi_bios,
 797         .can_queue              = 40,
 798         .this_id                = -1,
 799         .sg_tablesize           = 256,
 800         .cmd_per_lun            = 5,
 801         .max_sectors            = 128,
 802         .use_clustering         = DISABLE_CLUSTERING,
 803         .emulated               = 1,
 804         .proc_name              = "ide-scsi",
 805 };
 806
 807 static int ide_scsi_probe(ide_drive_t *drive)
 808 {
 809         idescsi_scsi_t *idescsi;
 810         struct Scsi_Host *host;
 811         struct gendisk *g;
 812         static int warned;
 813         int err = -ENOMEM;
 814
 815         if (!warned && drive->media == ide_cdrom) {
 816                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 817                 warned = 1;
 818         }
 819
 820         if (idescsi_nocd && drive->media == ide_cdrom)
 821                 return -ENODEV;
 822
 823         if (!strstr("ide-scsi", drive->driver_req) ||
 824             !drive->present ||
 825             drive->media == ide_disk ||
 826             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 827                 return -ENODEV;
 828
 829         drive->scsi = 1;
 830
 831         g = alloc_disk(1 << PARTN_BITS);
 832         if (!g)
 833                 goto out_host_put;
 834
 835         ide_init_disk(g, drive);
 836
 837         host->max_id = 1;
 838
 839         if (drive->id->last_lun)
 840                 debug_log("%s: id->last_lun=%u\n", drive->name,
 841                           drive->id->last_lun);
 842
 843         if ((drive->id->last_lun & 0x7) != 7)
 844                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 845         else
 846                 host->max_lun = 1;
 847
 848         drive->driver_data = host;
 849         idescsi = scsihost_to_idescsi(host);
 850         idescsi->drive = drive;
 851         idescsi->driver = &idescsi_driver;
 852         idescsi->host = host;
 853         idescsi->disk = g;
 854         g->private_data = &idescsi->driver;
 855         ide_proc_register_driver(drive, &idescsi_driver);
 856         err = 0;
 857         idescsi_setup(drive, idescsi);
 858         g->fops = &idescsi_ops;
 859         ide_register_region(g);
 860         err = scsi_add_host(host, &drive->gendev);
 861         if (!err) {
 862                 scsi_scan_host(host);
 863                 return 0;
 864         }
 865         /* fall through on error */
 866         ide_unregister_region(g);
 867         ide_proc_unregister_driver(drive, &idescsi_driver);
 868
 869         put_disk(g);
 870 out_host_put:
 871         drive->scsi = 0;
 872         scsi_host_put(host);
 873         return err;
 874 }
 875
 876 static int __init init_idescsi_module(void)
 877 {
 878         return driver_register(&idescsi_driver.gen_driver);
 879 }
 880
 881 static void __exit exit_idescsi_module(void)
 882 {
 883         driver_unregister(&idescsi_driver.gen_driver);
 884 }
 885
 886 module_param(idescsi_nocd, int, 0600);
 887 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 888 module_init(init_idescsi_module);
 889 module_exit(exit_idescsi_module);
 890 MODULE_LICENSE("GPL");