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