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 flags;                    /* Status/Action flags */
  88         unsigned long transform;                /* SCSI cmd translation layer */
  89         unsigned long log;                      /* log flags */
  90 } idescsi_scsi_t;
  91
  92 static DEFINE_MUTEX(idescsi_ref_mutex);
  93 /* Set by module param to skip cd */
  94 static int idescsi_nocd;
  95
  96 #define ide_scsi_g(disk) \
  97         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  98
  99 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 100 {
 101         struct ide_scsi_obj *scsi = NULL;
 102
 103         mutex_lock(&idescsi_ref_mutex);
 104         scsi = ide_scsi_g(disk);
 105         if (scsi)
 106                 scsi_host_get(scsi->host);
 107         mutex_unlock(&idescsi_ref_mutex);
 108         return scsi;
 109 }
 110
 111 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 112 {
 113         mutex_lock(&idescsi_ref_mutex);
 114         scsi_host_put(scsi->host);
 115         mutex_unlock(&idescsi_ref_mutex);
 116 }
 117
 118 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 119 {
 120         return (idescsi_scsi_t*) (&host[1]);
 121 }
 122
 123 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 124 {
 125         return scsihost_to_idescsi(ide_drive->driver_data);
 126 }
 127
 128 /*
 129  *      Per ATAPI device status bits.
 130  */
 131 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 132
 133 /*
 134  *      ide-scsi requests.
 135  */
 136 #define IDESCSI_PC_RQ                   90
 137
 138 /*
 139  *      PIO data transfer routine using the scatter gather table.
 140  */
 141 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 142                                 unsigned int bcount, int write)
 143 {
 144         ide_hwif_t *hwif = drive->hwif;
 145         xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
 146         char *buf;
 147         int count;
 148
 149         while (bcount) {
 150                 count = min(pc->sg->length - pc->b_count, bcount);
 151                 if (PageHighMem(sg_page(pc->sg))) {
 152                         unsigned long flags;
 153
 154                         local_irq_save(flags);
 155                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 156                                           pc->sg->offset;
 157                         xf(drive, NULL, buf + pc->b_count, count);
 158                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 159                         local_irq_restore(flags);
 160                 } else {
 161                         buf = sg_virt(pc->sg);
 162                         xf(drive, NULL, buf + pc->b_count, count);
 163                 }
 164                 bcount -= count; pc->b_count += count;
 165                 if (pc->b_count == pc->sg->length) {
 166                         if (!--pc->sg_cnt)
 167                                 break;
 168                         pc->sg = sg_next(pc->sg);
 169                         pc->b_count = 0;
 170                 }
 171         }
 172
 173         if (bcount) {
 174                 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
 175                                 drive->name, write ? "padding with zeros"
 176                                                    : "discarding data");
 177                 ide_pad_transfer(drive, write, bcount);
 178         }
 179 }
 180
 181 static void ide_scsi_hex_dump(u8 *data, int len)
 182 {
 183         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 184 }
 185
 186 static int idescsi_end_request(ide_drive_t *, int, int);
 187
 188 static void ide_scsi_callback(ide_drive_t *drive)
 189 {
 190         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 191         struct ide_atapi_pc *pc = scsi->pc;
 192
 193         if (pc->flags & PC_FLAG_TIMEDOUT)
 194                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 195                           pc->scsi_cmd->serial_number, jiffies);
 196                 /* end this request now - scsi should retry it*/
 197         else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 198                 printk(KERN_INFO "Packet command completed, %d bytes"
 199                                  " transferred\n", pc->xferred);
 200
 201         idescsi_end_request(drive, 1, 0);
 202 }
 203
 204 static int idescsi_check_condition(ide_drive_t *drive,
 205                 struct request *failed_cmd)
 206 {
 207         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 208         struct ide_atapi_pc   *pc;
 209         struct request *rq;
 210         u8             *buf;
 211
 212         /* stuff a sense request in front of our current request */
 213         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 214         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 215         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 216         if (!pc || !rq || !buf) {
 217                 kfree(buf);
 218                 kfree(rq);
 219                 kfree(pc);
 220                 return -ENOMEM;
 221         }
 222         blk_rq_init(NULL, rq);
 223         rq->special = (char *) pc;
 224         pc->rq = rq;
 225         pc->buf = buf;
 226         pc->c[0] = REQUEST_SENSE;
 227         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 228         rq->cmd_type = REQ_TYPE_SENSE;
 229         rq->cmd_flags |= REQ_PREEMPT;
 230         pc->timeout = jiffies + WAIT_READY;
 231         pc->callback = ide_scsi_callback;
 232         /* NOTE! Save the failed packet command in "rq->buffer" */
 233         rq->buffer = (void *) failed_cmd->special;
 234         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 235         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 236                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 237                 ide_scsi_hex_dump(pc->c, 6);
 238         }
 239         rq->rq_disk = scsi->disk;
 240         ide_do_drive_cmd(drive, rq);
 241         return 0;
 242 }
 243
 244 static ide_startstop_t
 245 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 246 {
 247         ide_hwif_t *hwif = drive->hwif;
 248
 249         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 250                 /* force an abort */
 251                 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
 252                                hwif->io_ports.command_addr);
 253
 254         rq->errors++;
 255
 256         idescsi_end_request(drive, 0, 0);
 257
 258         return ide_stopped;
 259 }
 260
 261 static ide_startstop_t
 262 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 263 {
 264         debug_log("%s called for %lu\n", __func__,
 265                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 266
 267         rq->errors |= ERROR_MAX;
 268
 269         idescsi_end_request(drive, 0, 0);
 270
 271         return ide_stopped;
 272 }
 273
 274 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 275 {
 276         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 277         struct request *rq = HWGROUP(drive)->rq;
 278         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 279         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 280         struct Scsi_Host *host;
 281         int errors = rq->errors;
 282         unsigned long flags;
 283
 284         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 285                 ide_end_request(drive, uptodate, nrsecs);
 286                 return 0;
 287         }
 288         ide_end_drive_cmd (drive, 0, 0);
 289         if (blk_sense_request(rq)) {
 290                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 291                 if (log) {
 292                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 293                         ide_scsi_hex_dump(pc->buf, 16);
 294                 }
 295                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 296                         SCSI_SENSE_BUFFERSIZE);
 297                 kfree(pc->buf);
 298                 kfree(pc);
 299                 kfree(rq);
 300                 pc = opc;
 301                 rq = pc->rq;
 302                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 303                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 304                                   DID_TIME_OUT :
 305                                   DID_OK) << 16);
 306         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 307                 if (log)
 308                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 309                                         drive->name, pc->scsi_cmd->serial_number);
 310                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 311         } else if (errors >= ERROR_MAX) {
 312                 pc->scsi_cmd->result = DID_ERROR << 16;
 313                 if (log)
 314                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 315         } else if (errors) {
 316                 if (log)
 317                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 318                 if (!idescsi_check_condition(drive, rq))
 319                         /* we started a request sense, so we'll be back, exit for now */
 320                         return 0;
 321                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 322         } else {
 323                 pc->scsi_cmd->result = DID_OK << 16;
 324         }
 325         host = pc->scsi_cmd->device->host;
 326         spin_lock_irqsave(host->host_lock, flags);
 327         pc->done(pc->scsi_cmd);
 328         spin_unlock_irqrestore(host->host_lock, flags);
 329         kfree(pc);
 330         kfree(rq);
 331         scsi->pc = NULL;
 332         return 0;
 333 }
 334
 335 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 336 {
 337         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 338 }
 339
 340 static int idescsi_expiry(ide_drive_t *drive)
 341 {
 342         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 343         struct ide_atapi_pc   *pc   = scsi->pc;
 344
 345         debug_log("%s called for %lu at %lu\n", __func__,
 346                   pc->scsi_cmd->serial_number, jiffies);
 347
 348         pc->flags |= PC_FLAG_TIMEDOUT;
 349
 350         return 0;                                       /* we do not want the ide subsystem to retry */
 351 }
 352
 353 /*
 354  *      Our interrupt handler.
 355  */
 356 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 357 {
 358         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 359         struct ide_atapi_pc *pc = scsi->pc;
 360
 361         return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
 362                            idescsi_expiry, NULL, NULL, NULL,
 363                            ide_scsi_io_buffers);
 364 }
 365
 366 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 367 {
 368         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 369
 370         return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
 371                                get_timeout(scsi->pc), idescsi_expiry);
 372 }
 373
 374 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 375 {
 376         switch (pc->c[0]) {
 377                 case READ_6: case READ_10: case READ_12:
 378                         pc->flags &= ~PC_FLAG_WRITING;
 379                         return 0;
 380                 case WRITE_6: case WRITE_10: case WRITE_12:
 381                         pc->flags |= PC_FLAG_WRITING;
 382                         return 0;
 383                 default:
 384                         return 1;
 385         }
 386 }
 387
 388 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 389 {
 390         ide_hwif_t *hwif = drive->hwif;
 391         struct scatterlist *sg, *scsi_sg;
 392         int segments;
 393
 394         if (!pc->req_xfer || pc->req_xfer % 1024)
 395                 return 1;
 396
 397         if (idescsi_set_direction(pc))
 398                 return 1;
 399
 400         sg = hwif->sg_table;
 401         scsi_sg = scsi_sglist(pc->scsi_cmd);
 402         segments = scsi_sg_count(pc->scsi_cmd);
 403
 404         if (segments > hwif->sg_max_nents)
 405                 return 1;
 406
 407         hwif->sg_nents = segments;
 408         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 409
 410         return 0;
 411 }
 412
 413 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 414                 struct ide_atapi_pc *pc)
 415 {
 416         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 417
 418         /* Set the current packet command */
 419         scsi->pc = pc;
 420
 421         return ide_issue_pc(drive, pc, idescsi_transfer_pc,
 422                             get_timeout(pc), idescsi_expiry);
 423 }
 424
 425 /*
 426  *      idescsi_do_request is our request handling function.
 427  */
 428 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 429 {
 430         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 431                   rq->cmd[0], rq->errors);
 432         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 433                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 434
 435         if (blk_sense_request(rq) || blk_special_request(rq)) {
 436                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 437                 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 438
 439                 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags))
 440                         pc->flags |= PC_FLAG_DRQ_INTERRUPT;
 441
 442                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 443                         pc->flags |= PC_FLAG_DMA_OK;
 444
 445                 return idescsi_issue_pc(drive, pc);
 446         }
 447         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 448         idescsi_end_request (drive, 0, 0);
 449         return ide_stopped;
 450 }
 451
 452 #ifdef CONFIG_IDE_PROC_FS
 453 static void idescsi_add_settings(ide_drive_t *drive)
 454 {
 455         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 456
 457 /*
 458  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 459  */
 460         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 461         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 462         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 463         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 464         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 465 }
 466 #else
 467 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 468 #endif
 469
 470 /*
 471  *      Driver initialization.
 472  */
 473 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 474 {
 475         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 476                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 477         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 478 #if IDESCSI_DEBUG_LOG
 479         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 480 #endif /* IDESCSI_DEBUG_LOG */
 481         idescsi_add_settings(drive);
 482 }
 483
 484 static void ide_scsi_remove(ide_drive_t *drive)
 485 {
 486         struct Scsi_Host *scsihost = drive->driver_data;
 487         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 488         struct gendisk *g = scsi->disk;
 489
 490         scsi_remove_host(scsihost);
 491         ide_proc_unregister_driver(drive, scsi->driver);
 492
 493         ide_unregister_region(g);
 494
 495         drive->driver_data = NULL;
 496         g->private_data = NULL;
 497         put_disk(g);
 498
 499         ide_scsi_put(scsi);
 500
 501         drive->scsi = 0;
 502 }
 503
 504 static int ide_scsi_probe(ide_drive_t *);
 505
 506 #ifdef CONFIG_IDE_PROC_FS
 507 static ide_proc_entry_t idescsi_proc[] = {
 508         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 509         { NULL, 0, NULL, NULL }
 510 };
 511 #endif
 512
 513 static ide_driver_t idescsi_driver = {
 514         .gen_driver = {
 515                 .owner          = THIS_MODULE,
 516                 .name           = "ide-scsi",
 517                 .bus            = &ide_bus_type,
 518         },
 519         .probe                  = ide_scsi_probe,
 520         .remove                 = ide_scsi_remove,
 521         .version                = IDESCSI_VERSION,
 522         .media                  = ide_scsi,
 523         .supports_dsc_overlap   = 0,
 524         .do_request             = idescsi_do_request,
 525         .end_request            = idescsi_end_request,
 526         .error                  = idescsi_atapi_error,
 527         .abort                  = idescsi_atapi_abort,
 528 #ifdef CONFIG_IDE_PROC_FS
 529         .proc                   = idescsi_proc,
 530 #endif
 531 };
 532
 533 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 534 {
 535         struct gendisk *disk = inode->i_bdev->bd_disk;
 536         struct ide_scsi_obj *scsi;
 537
 538         if (!(scsi = ide_scsi_get(disk)))
 539                 return -ENXIO;
 540
 541         return 0;
 542 }
 543
 544 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 545 {
 546         struct gendisk *disk = inode->i_bdev->bd_disk;
 547         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 548
 549         ide_scsi_put(scsi);
 550
 551         return 0;
 552 }
 553
 554 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 555                         unsigned int cmd, unsigned long arg)
 556 {
 557         struct block_device *bdev = inode->i_bdev;
 558         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 559         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 560 }
 561
 562 static struct block_device_operations idescsi_ops = {
 563         .owner          = THIS_MODULE,
 564         .open           = idescsi_ide_open,
 565         .release        = idescsi_ide_release,
 566         .ioctl          = idescsi_ide_ioctl,
 567 };
 568
 569 static int idescsi_slave_configure(struct scsi_device * sdp)
 570 {
 571         /* Configure detected device */
 572         sdp->use_10_for_rw = 1;
 573         sdp->use_10_for_ms = 1;
 574         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 575         return 0;
 576 }
 577
 578 static const char *idescsi_info (struct Scsi_Host *host)
 579 {
 580         return "SCSI host adapter emulation for IDE ATAPI devices";
 581 }
 582
 583 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 584 {
 585         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 586
 587         if (cmd == SG_SET_TRANSFORM) {
 588                 if (arg)
 589                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 590                 else
 591                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 592                 return 0;
 593         } else if (cmd == SG_GET_TRANSFORM)
 594                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 595         return -EINVAL;
 596 }
 597
 598 static int idescsi_queue (struct scsi_cmnd *cmd,
 599                 void (*done)(struct scsi_cmnd *))
 600 {
 601         struct Scsi_Host *host = cmd->device->host;
 602         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 603         ide_drive_t *drive = scsi->drive;
 604         struct request *rq = NULL;
 605         struct ide_atapi_pc *pc = NULL;
 606
 607         if (!drive) {
 608                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 609                 goto abort;
 610         }
 611         scsi = drive_to_idescsi(drive);
 612         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 613         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 614         if (rq == NULL || pc == NULL) {
 615                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 616                 goto abort;
 617         }
 618
 619         memset (pc->c, 0, 12);
 620         pc->flags = 0;
 621         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 622                 pc->flags |= PC_FLAG_WRITING;
 623         pc->rq = rq;
 624         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 625         pc->buf = NULL;
 626         pc->sg = scsi_sglist(cmd);
 627         pc->sg_cnt = scsi_sg_count(cmd);
 628         pc->b_count = 0;
 629         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 630         pc->scsi_cmd = cmd;
 631         pc->done = done;
 632         pc->timeout = jiffies + cmd->timeout_per_command;
 633         pc->callback = ide_scsi_callback;
 634
 635         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 636                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 637                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 638                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 639                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 640                         ide_scsi_hex_dump(pc->c, 12);
 641                 }
 642         }
 643
 644         blk_rq_init(NULL, rq);
 645         rq->special = (char *) pc;
 646         rq->cmd_type = REQ_TYPE_SPECIAL;
 647         spin_unlock_irq(host->host_lock);
 648         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 649         spin_lock_irq(host->host_lock);
 650         return 0;
 651 abort:
 652         kfree (pc);
 653         kfree (rq);
 654         cmd->result = DID_ERROR << 16;
 655         done(cmd);
 656         return 0;
 657 }
 658
 659 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 660 {
 661         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 662         ide_drive_t    *drive = scsi->drive;
 663         int             busy;
 664         int             ret   = FAILED;
 665
 666         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 667
 668         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 669                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 670
 671         if (!drive) {
 672                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 673                 WARN_ON(1);
 674                 goto no_drive;
 675         }
 676
 677         /* First give it some more time, how much is "right" is hard to say :-( */
 678
 679         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 680         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 681                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 682
 683         spin_lock_irq(&ide_lock);
 684
 685         /* If there is no pc running we're done (our interrupt took care of it) */
 686         if (!scsi->pc) {
 687                 ret = SUCCESS;
 688                 goto ide_unlock;
 689         }
 690
 691         /* It's somewhere in flight. Does ide subsystem agree? */
 692         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 693             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 694                 /*
 695                  * FIXME - not sure this condition can ever occur
 696                  */
 697                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 698
 699                 if (blk_sense_request(scsi->pc->rq))
 700                         kfree(scsi->pc->buf);
 701                 kfree(scsi->pc->rq);
 702                 kfree(scsi->pc);
 703                 scsi->pc = NULL;
 704
 705                 ret = SUCCESS;
 706         }
 707
 708 ide_unlock:
 709         spin_unlock_irq(&ide_lock);
 710 no_drive:
 711         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 712                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 713
 714         return ret;
 715 }
 716
 717 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 718 {
 719         struct request *req;
 720         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 721         ide_drive_t    *drive = scsi->drive;
 722         int             ready = 0;
 723         int             ret   = SUCCESS;
 724
 725         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 726
 727         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 728                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 729
 730         if (!drive) {
 731                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 732                 WARN_ON(1);
 733                 return FAILED;
 734         }
 735
 736         spin_lock_irq(cmd->device->host->host_lock);
 737         spin_lock(&ide_lock);
 738
 739         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 740                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 741                 spin_unlock(&ide_lock);
 742                 spin_unlock_irq(cmd->device->host->host_lock);
 743                 return FAILED;
 744         }
 745
 746         /* kill current request */
 747         if (__blk_end_request(req, -EIO, 0))
 748                 BUG();
 749         if (blk_sense_request(req))
 750                 kfree(scsi->pc->buf);
 751         kfree(scsi->pc);
 752         scsi->pc = NULL;
 753         kfree(req);
 754
 755         /* now nuke the drive queue */
 756         while ((req = elv_next_request(drive->queue))) {
 757                 if (__blk_end_request(req, -EIO, 0))
 758                         BUG();
 759         }
 760
 761         HWGROUP(drive)->rq = NULL;
 762         HWGROUP(drive)->handler = NULL;
 763         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 764         spin_unlock(&ide_lock);
 765
 766         ide_do_reset(drive);
 767
 768         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 769
 770         do {
 771                 spin_unlock_irq(cmd->device->host->host_lock);
 772                 msleep(50);
 773                 spin_lock_irq(cmd->device->host->host_lock);
 774         } while ( HWGROUP(drive)->handler );
 775
 776         ready = drive_is_ready(drive);
 777         HWGROUP(drive)->busy--;
 778         if (!ready) {
 779                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 780                 ret = FAILED;
 781         }
 782
 783         spin_unlock_irq(cmd->device->host->host_lock);
 784         return ret;
 785 }
 786
 787 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 788                 sector_t capacity, int *parm)
 789 {
 790         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 791         ide_drive_t *drive = idescsi->drive;
 792
 793         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 794                 parm[0] = drive->bios_head;
 795                 parm[1] = drive->bios_sect;
 796                 parm[2] = drive->bios_cyl;
 797         }
 798         return 0;
 799 }
 800
 801 static struct scsi_host_template idescsi_template = {
 802         .module                 = THIS_MODULE,
 803         .name                   = "idescsi",
 804         .info                   = idescsi_info,
 805         .slave_configure        = idescsi_slave_configure,
 806         .ioctl                  = idescsi_ioctl,
 807         .queuecommand           = idescsi_queue,
 808         .eh_abort_handler       = idescsi_eh_abort,
 809         .eh_host_reset_handler  = idescsi_eh_reset,
 810         .bios_param             = idescsi_bios,
 811         .can_queue              = 40,
 812         .this_id                = -1,
 813         .sg_tablesize           = 256,
 814         .cmd_per_lun            = 5,
 815         .max_sectors            = 128,
 816         .use_clustering         = DISABLE_CLUSTERING,
 817         .emulated               = 1,
 818         .proc_name              = "ide-scsi",
 819 };
 820
 821 static int ide_scsi_probe(ide_drive_t *drive)
 822 {
 823         idescsi_scsi_t *idescsi;
 824         struct Scsi_Host *host;
 825         struct gendisk *g;
 826         static int warned;
 827         int err = -ENOMEM;
 828
 829         if (!warned && drive->media == ide_cdrom) {
 830                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 831                 warned = 1;
 832         }
 833
 834         if (idescsi_nocd && drive->media == ide_cdrom)
 835                 return -ENODEV;
 836
 837         if (!strstr("ide-scsi", drive->driver_req) ||
 838             !drive->present ||
 839             drive->media == ide_disk ||
 840             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 841                 return -ENODEV;
 842
 843         drive->scsi = 1;
 844
 845         g = alloc_disk(1 << PARTN_BITS);
 846         if (!g)
 847                 goto out_host_put;
 848
 849         ide_init_disk(g, drive);
 850
 851         host->max_id = 1;
 852
 853         if (drive->id->last_lun)
 854                 debug_log("%s: id->last_lun=%u\n", drive->name,
 855                           drive->id->last_lun);
 856
 857         if ((drive->id->last_lun & 0x7) != 7)
 858                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 859         else
 860                 host->max_lun = 1;
 861
 862         drive->driver_data = host;
 863         idescsi = scsihost_to_idescsi(host);
 864         idescsi->drive = drive;
 865         idescsi->driver = &idescsi_driver;
 866         idescsi->host = host;
 867         idescsi->disk = g;
 868         g->private_data = &idescsi->driver;
 869         ide_proc_register_driver(drive, &idescsi_driver);
 870         err = 0;
 871         idescsi_setup(drive, idescsi);
 872         g->fops = &idescsi_ops;
 873         ide_register_region(g);
 874         err = scsi_add_host(host, &drive->gendev);
 875         if (!err) {
 876                 scsi_scan_host(host);
 877                 return 0;
 878         }
 879         /* fall through on error */
 880         ide_unregister_region(g);
 881         ide_proc_unregister_driver(drive, &idescsi_driver);
 882
 883         put_disk(g);
 884 out_host_put:
 885         drive->scsi = 0;
 886         scsi_host_put(host);
 887         return err;
 888 }
 889
 890 static int __init init_idescsi_module(void)
 891 {
 892         return driver_register(&idescsi_driver.gen_driver);
 893 }
 894
 895 static void __exit exit_idescsi_module(void)
 896 {
 897         driver_unregister(&idescsi_driver.gen_driver);
 898 }
 899
 900 module_param(idescsi_nocd, int, 0600);
 901 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 902 module_init(init_idescsi_module);
 903 module_exit(exit_idescsi_module);
 904 MODULE_LICENSE("GPL");