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 /*
 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) & (ATA_BUSY | ATA_DRQ))
 247                 /* force an abort */
 248                 hwif->tp_ops->exec_command(hwif, ATA_CMD_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 #define ide_scsi_devset_get(name, field) \
 433 static int get_##name(ide_drive_t *drive) \
 434 { \
 435         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 436         return scsi->field; \
 437 }
 438
 439 #define ide_scsi_devset_set(name, field) \
 440 static int set_##name(ide_drive_t *drive, int arg) \
 441 { \
 442         idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
 443         scsi->field = arg; \
 444         return 0; \
 445 }
 446
 447 #define ide_scsi_devset_rw(_name, _min, _max, _field) \
 448 ide_scsi_devset_get(_name, _field); \
 449 ide_scsi_devset_set(_name, _field); \
 450 IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name)
 451
 452 ide_devset_rw(bios_cyl,         0, 1023, bios_cyl);
 453 ide_devset_rw(bios_head,        0,  255, bios_head);
 454 ide_devset_rw(bios_sect,        0,   63, bios_sect);
 455
 456 ide_scsi_devset_rw(transform,   0,    3, transform);
 457 ide_scsi_devset_rw(log,         0,    1, log);
 458
 459 static const struct ide_devset *idescsi_settings[] = {
 460         &ide_devset_bios_cyl,
 461         &ide_devset_bios_head,
 462         &ide_devset_bios_sect,
 463         &ide_devset_log,
 464         &ide_devset_transform,
 465         NULL
 466 };
 467 #endif
 468
 469 /*
 470  *      Driver initialization.
 471  */
 472 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 473 {
 474         if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
 475                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
 476         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 477 #if IDESCSI_DEBUG_LOG
 478         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 479 #endif /* IDESCSI_DEBUG_LOG */
 480
 481         drive->pc_callback = ide_scsi_callback;
 482
 483         ide_proc_register_driver(drive, scsi->driver);
 484 }
 485
 486 static void ide_scsi_remove(ide_drive_t *drive)
 487 {
 488         struct Scsi_Host *scsihost = drive->driver_data;
 489         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 490         struct gendisk *g = scsi->disk;
 491
 492         scsi_remove_host(scsihost);
 493         ide_proc_unregister_driver(drive, scsi->driver);
 494
 495         ide_unregister_region(g);
 496
 497         drive->driver_data = NULL;
 498         g->private_data = NULL;
 499         put_disk(g);
 500
 501         ide_scsi_put(scsi);
 502
 503         drive->scsi = 0;
 504 }
 505
 506 static int ide_scsi_probe(ide_drive_t *);
 507
 508 #ifdef CONFIG_IDE_PROC_FS
 509 static ide_proc_entry_t idescsi_proc[] = {
 510         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 511         { NULL, 0, NULL, NULL }
 512 };
 513 #endif
 514
 515 static ide_driver_t idescsi_driver = {
 516         .gen_driver = {
 517                 .owner          = THIS_MODULE,
 518                 .name           = "ide-scsi",
 519                 .bus            = &ide_bus_type,
 520         },
 521         .probe                  = ide_scsi_probe,
 522         .remove                 = ide_scsi_remove,
 523         .version                = IDESCSI_VERSION,
 524         .media                  = ide_scsi,
 525         .do_request             = idescsi_do_request,
 526         .end_request            = idescsi_end_request,
 527         .error                  = idescsi_atapi_error,
 528 #ifdef CONFIG_IDE_PROC_FS
 529         .proc                   = idescsi_proc,
 530         .settings               = idescsi_settings,
 531 #endif
 532 };
 533
 534 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 535 {
 536         struct gendisk *disk = inode->i_bdev->bd_disk;
 537         struct ide_scsi_obj *scsi;
 538
 539         if (!(scsi = ide_scsi_get(disk)))
 540                 return -ENXIO;
 541
 542         return 0;
 543 }
 544
 545 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 546 {
 547         struct gendisk *disk = inode->i_bdev->bd_disk;
 548         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 549
 550         ide_scsi_put(scsi);
 551
 552         return 0;
 553 }
 554
 555 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 556                         unsigned int cmd, unsigned long arg)
 557 {
 558         struct block_device *bdev = inode->i_bdev;
 559         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 560         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 561 }
 562
 563 static struct block_device_operations idescsi_ops = {
 564         .owner          = THIS_MODULE,
 565         .open           = idescsi_ide_open,
 566         .release        = idescsi_ide_release,
 567         .ioctl          = idescsi_ide_ioctl,
 568 };
 569
 570 static int idescsi_slave_configure(struct scsi_device * sdp)
 571 {
 572         /* Configure detected device */
 573         sdp->use_10_for_rw = 1;
 574         sdp->use_10_for_ms = 1;
 575         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 576         return 0;
 577 }
 578
 579 static const char *idescsi_info (struct Scsi_Host *host)
 580 {
 581         return "SCSI host adapter emulation for IDE ATAPI devices";
 582 }
 583
 584 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 585 {
 586         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 587
 588         if (cmd == SG_SET_TRANSFORM) {
 589                 if (arg)
 590                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 591                 else
 592                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 593                 return 0;
 594         } else if (cmd == SG_GET_TRANSFORM)
 595                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 596         return -EINVAL;
 597 }
 598
 599 static int idescsi_queue (struct scsi_cmnd *cmd,
 600                 void (*done)(struct scsi_cmnd *))
 601 {
 602         struct Scsi_Host *host = cmd->device->host;
 603         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 604         ide_drive_t *drive = scsi->drive;
 605         struct request *rq = NULL;
 606         struct ide_atapi_pc *pc = NULL;
 607         int write = cmd->sc_data_direction == DMA_TO_DEVICE;
 608
 609         if (!drive) {
 610                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 611                 goto abort;
 612         }
 613         scsi = drive_to_idescsi(drive);
 614         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 615         rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
 616         if (rq == NULL || pc == NULL) {
 617                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 618                 goto abort;
 619         }
 620
 621         memset (pc->c, 0, 12);
 622         pc->flags = 0;
 623         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 624                 pc->flags |= PC_FLAG_WRITING;
 625         pc->rq = rq;
 626         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 627         pc->buf = NULL;
 628         pc->sg = scsi_sglist(cmd);
 629         pc->sg_cnt = scsi_sg_count(cmd);
 630         pc->b_count = 0;
 631         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 632         pc->scsi_cmd = cmd;
 633         pc->done = done;
 634         pc->timeout = jiffies + cmd->request->timeout;
 635
 636         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 637                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 638                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 639                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 640                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 641                         ide_scsi_hex_dump(pc->c, 12);
 642                 }
 643         }
 644
 645         rq->special = (char *) pc;
 646         rq->cmd_type = REQ_TYPE_SPECIAL;
 647         spin_unlock_irq(host->host_lock);
 648         rq->ref_count++;
 649         memcpy(rq->cmd, pc->c, 12);
 650         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 651         spin_lock_irq(host->host_lock);
 652         return 0;
 653 abort:
 654         kfree (pc);
 655         if (rq)
 656                 blk_put_request(rq);
 657         cmd->result = DID_ERROR << 16;
 658         done(cmd);
 659         return 0;
 660 }
 661
 662 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 663 {
 664         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 665         ide_drive_t    *drive = scsi->drive;
 666         int             busy;
 667         int             ret   = FAILED;
 668
 669         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 670
 671         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 672                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 673
 674         if (!drive) {
 675                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 676                 WARN_ON(1);
 677                 goto no_drive;
 678         }
 679
 680         /* First give it some more time, how much is "right" is hard to say :-( */
 681
 682         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 683         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 684                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 685
 686         spin_lock_irq(&ide_lock);
 687
 688         /* If there is no pc running we're done (our interrupt took care of it) */
 689         if (!scsi->pc) {
 690                 ret = SUCCESS;
 691                 goto ide_unlock;
 692         }
 693
 694         /* It's somewhere in flight. Does ide subsystem agree? */
 695         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 696             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 697                 /*
 698                  * FIXME - not sure this condition can ever occur
 699                  */
 700                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 701
 702                 if (blk_sense_request(scsi->pc->rq))
 703                         kfree(scsi->pc->buf);
 704                 /* we need to call blk_put_request twice. */
 705                 blk_put_request(scsi->pc->rq);
 706                 blk_put_request(scsi->pc->rq);
 707                 kfree(scsi->pc);
 708                 scsi->pc = NULL;
 709
 710                 ret = SUCCESS;
 711         }
 712
 713 ide_unlock:
 714         spin_unlock_irq(&ide_lock);
 715 no_drive:
 716         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 717                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 718
 719         return ret;
 720 }
 721
 722 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 723 {
 724         struct request *req;
 725         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 726         ide_drive_t    *drive = scsi->drive;
 727         int             ready = 0;
 728         int             ret   = SUCCESS;
 729
 730         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 731
 732         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 733                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 734
 735         if (!drive) {
 736                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 737                 WARN_ON(1);
 738                 return FAILED;
 739         }
 740
 741         spin_lock_irq(cmd->device->host->host_lock);
 742         spin_lock(&ide_lock);
 743
 744         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 745                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 746                 spin_unlock(&ide_lock);
 747                 spin_unlock_irq(cmd->device->host->host_lock);
 748                 return FAILED;
 749         }
 750
 751         /* kill current request */
 752         if (__blk_end_request(req, -EIO, 0))
 753                 BUG();
 754         if (blk_sense_request(req))
 755                 kfree(scsi->pc->buf);
 756         kfree(scsi->pc);
 757         scsi->pc = NULL;
 758         blk_put_request(req);
 759
 760         /* now nuke the drive queue */
 761         while ((req = elv_next_request(drive->queue))) {
 762                 if (__blk_end_request(req, -EIO, 0))
 763                         BUG();
 764         }
 765
 766         HWGROUP(drive)->rq = NULL;
 767         HWGROUP(drive)->handler = NULL;
 768         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 769         spin_unlock(&ide_lock);
 770
 771         ide_do_reset(drive);
 772
 773         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 774
 775         do {
 776                 spin_unlock_irq(cmd->device->host->host_lock);
 777                 msleep(50);
 778                 spin_lock_irq(cmd->device->host->host_lock);
 779         } while ( HWGROUP(drive)->handler );
 780
 781         ready = drive_is_ready(drive);
 782         HWGROUP(drive)->busy--;
 783         if (!ready) {
 784                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 785                 ret = FAILED;
 786         }
 787
 788         spin_unlock_irq(cmd->device->host->host_lock);
 789         return ret;
 790 }
 791
 792 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 793                 sector_t capacity, int *parm)
 794 {
 795         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 796         ide_drive_t *drive = idescsi->drive;
 797
 798         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 799                 parm[0] = drive->bios_head;
 800                 parm[1] = drive->bios_sect;
 801                 parm[2] = drive->bios_cyl;
 802         }
 803         return 0;
 804 }
 805
 806 static struct scsi_host_template idescsi_template = {
 807         .module                 = THIS_MODULE,
 808         .name                   = "idescsi",
 809         .info                   = idescsi_info,
 810         .slave_configure        = idescsi_slave_configure,
 811         .ioctl                  = idescsi_ioctl,
 812         .queuecommand           = idescsi_queue,
 813         .eh_abort_handler       = idescsi_eh_abort,
 814         .eh_host_reset_handler  = idescsi_eh_reset,
 815         .bios_param             = idescsi_bios,
 816         .can_queue              = 40,
 817         .this_id                = -1,
 818         .sg_tablesize           = 256,
 819         .cmd_per_lun            = 5,
 820         .max_sectors            = 128,
 821         .use_clustering         = DISABLE_CLUSTERING,
 822         .emulated               = 1,
 823         .proc_name              = "ide-scsi",
 824 };
 825
 826 static int ide_scsi_probe(ide_drive_t *drive)
 827 {
 828         idescsi_scsi_t *idescsi;
 829         struct Scsi_Host *host;
 830         struct gendisk *g;
 831         static int warned;
 832         int err = -ENOMEM;
 833         u16 last_lun;
 834
 835         if (!warned && drive->media == ide_cdrom) {
 836                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 837                 warned = 1;
 838         }
 839
 840         if (idescsi_nocd && drive->media == ide_cdrom)
 841                 return -ENODEV;
 842
 843         if (!strstr("ide-scsi", drive->driver_req) ||
 844             drive->media == ide_disk ||
 845             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 846                 return -ENODEV;
 847
 848         drive->scsi = 1;
 849
 850         g = alloc_disk(1 << PARTN_BITS);
 851         if (!g)
 852                 goto out_host_put;
 853
 854         ide_init_disk(g, drive);
 855
 856         host->max_id = 1;
 857
 858         last_lun = drive->id[ATA_ID_LAST_LUN];
 859         if (last_lun)
 860                 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
 861
 862         if ((last_lun & 7) != 7)
 863                 host->max_lun = (last_lun & 7) + 1;
 864         else
 865                 host->max_lun = 1;
 866
 867         drive->driver_data = host;
 868         idescsi = scsihost_to_idescsi(host);
 869         idescsi->drive = drive;
 870         idescsi->driver = &idescsi_driver;
 871         idescsi->host = host;
 872         idescsi->disk = g;
 873         g->private_data = &idescsi->driver;
 874         err = 0;
 875         idescsi_setup(drive, idescsi);
 876         g->fops = &idescsi_ops;
 877         ide_register_region(g);
 878         err = scsi_add_host(host, &drive->gendev);
 879         if (!err) {
 880                 scsi_scan_host(host);
 881                 return 0;
 882         }
 883         /* fall through on error */
 884         ide_unregister_region(g);
 885         ide_proc_unregister_driver(drive, &idescsi_driver);
 886
 887         put_disk(g);
 888 out_host_put:
 889         drive->scsi = 0;
 890         scsi_host_put(host);
 891         return err;
 892 }
 893
 894 static int __init init_idescsi_module(void)
 895 {
 896         return driver_register(&idescsi_driver.gen_driver);
 897 }
 898
 899 static void __exit exit_idescsi_module(void)
 900 {
 901         driver_unregister(&idescsi_driver.gen_driver);
 902 }
 903
 904 module_param(idescsi_nocd, int, 0600);
 905 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 906 module_init(init_idescsi_module);
 907 module_exit(exit_idescsi_module);
 908 MODULE_LICENSE("GPL");