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