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         ide_hwif_t *hwif = drive->hwif;
 360         struct ide_atapi_pc *pc = scsi->pc;
 361         struct request *rq = pc->rq;
 362         xfer_func_t *xferfunc;
 363         unsigned int temp;
 364         u16 bcount;
 365         u8 stat, ireason;
 366
 367         debug_log("Enter %s - interrupt handler\n", __func__);
 368
 369         if (pc->flags & PC_FLAG_TIMEDOUT) {
 370                 pc->callback(drive);
 371                 return ide_stopped;
 372         }
 373
 374         /* Clear the interrupt */
 375         stat = ide_read_status(drive);
 376
 377         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 378                 if (hwif->dma_ops->dma_end(drive))
 379                         pc->flags |= PC_FLAG_DMA_ERROR;
 380                 else
 381                         pc->xferred = pc->req_xfer;
 382                 debug_log("%s: DMA finished\n", drive->name);
 383         }
 384
 385         if ((stat & DRQ_STAT) == 0) {
 386                 /* No more interrupts */
 387                 debug_log("Packet command completed, %d bytes transferred\n",
 388                           pc->xferred);
 389                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 390                 local_irq_enable_in_hardirq();
 391                 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
 392                         /* Error detected */
 393                         debug_log("%s: I/O error\n", drive->name);
 394
 395                         rq->errors++;
 396                 }
 397                 pc->callback(drive);
 398                 return ide_stopped;
 399         }
 400         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 401                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 402                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 403                                 "in DMA mode\n", drive->name);
 404                 ide_dma_off(drive);
 405                 return ide_do_reset(drive);
 406         }
 407         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 408                   hwif->INB(hwif->io_ports.lbam_addr);
 409         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 410
 411         if (ireason & CD) {
 412                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 413                 return ide_do_reset (drive);
 414         }
 415         if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
 416                 /* Hopefully, we will never get here */
 417                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 418                                 "to %s!\n", drive->name,
 419                                 (ireason & IO) ? "Write" : "Read",
 420                                 (ireason & IO) ? "Read" : "Write");
 421                 return ide_do_reset(drive);
 422         }
 423         if (!(pc->flags & PC_FLAG_WRITING)) {
 424                 temp = pc->xferred + bcount;
 425                 if (temp > pc->req_xfer) {
 426                         if (temp > pc->buf_size) {
 427                                 printk(KERN_ERR "%s: The device wants to send "
 428                                                 "us more data than expected - "
 429                                                 "discarding data\n",
 430                                                 drive->name);
 431                                 temp = pc->buf_size - pc->xferred;
 432                                 if (temp) {
 433                                         if (pc->sg)
 434                                                 ide_scsi_io_buffers(drive, pc,
 435                                                                     temp, 0);
 436                                         else
 437                                                 hwif->input_data(drive, NULL,
 438                                                         pc->cur_pos, temp);
 439                                         printk(KERN_ERR "%s: transferred %d of "
 440                                                         "%d bytes\n",
 441                                                         drive->name,
 442                                                         temp, bcount);
 443                                 }
 444                                 pc->xferred += temp;
 445                                 pc->cur_pos += temp;
 446                                 ide_pad_transfer(drive, 0, bcount - temp);
 447                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 448                                 return ide_started;
 449                         }
 450                         debug_log("The device wants to send us more data than "
 451                                   "expected - allowing transfer\n");
 452                 }
 453                 xferfunc = hwif->input_data;
 454         } else
 455                 xferfunc = hwif->output_data;
 456
 457         if (pc->sg)
 458                 ide_scsi_io_buffers(drive, pc, bcount,
 459                                     !!(pc->flags & PC_FLAG_WRITING));
 460         else
 461                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 462
 463         /* Update the current position */
 464         pc->xferred += bcount;
 465         pc->cur_pos += bcount;
 466
 467         debug_log("[cmd %x] transferred %d bytes on that intr.\n",
 468                   pc->c[0], bcount);
 469
 470         /* And set the interrupt handler again */
 471         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 472         return ide_started;
 473 }
 474
 475 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 476 {
 477         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 478
 479         return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
 480                                get_timeout(scsi->pc), idescsi_expiry);
 481 }
 482
 483 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 484 {
 485         switch (pc->c[0]) {
 486                 case READ_6: case READ_10: case READ_12:
 487                         pc->flags &= ~PC_FLAG_WRITING;
 488                         return 0;
 489                 case WRITE_6: case WRITE_10: case WRITE_12:
 490                         pc->flags |= PC_FLAG_WRITING;
 491                         return 0;
 492                 default:
 493                         return 1;
 494         }
 495 }
 496
 497 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 498 {
 499         ide_hwif_t *hwif = drive->hwif;
 500         struct scatterlist *sg, *scsi_sg;
 501         int segments;
 502
 503         if (!pc->req_xfer || pc->req_xfer % 1024)
 504                 return 1;
 505
 506         if (idescsi_set_direction(pc))
 507                 return 1;
 508
 509         sg = hwif->sg_table;
 510         scsi_sg = scsi_sglist(pc->scsi_cmd);
 511         segments = scsi_sg_count(pc->scsi_cmd);
 512
 513         if (segments > hwif->sg_max_nents)
 514                 return 1;
 515
 516         hwif->sg_nents = segments;
 517         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 518
 519         return 0;
 520 }
 521
 522 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 523                 struct ide_atapi_pc *pc)
 524 {
 525         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 526
 527         /* Set the current packet command */
 528         scsi->pc = pc;
 529
 530         return ide_issue_pc(drive, pc, idescsi_transfer_pc,
 531                             get_timeout(pc), idescsi_expiry);
 532 }
 533
 534 /*
 535  *      idescsi_do_request is our request handling function.
 536  */
 537 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 538 {
 539         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 540                   rq->cmd[0], rq->errors);
 541         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 542                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 543
 544         if (blk_sense_request(rq) || blk_special_request(rq)) {
 545                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 546                 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 547
 548                 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags))
 549                         pc->flags |= PC_FLAG_DRQ_INTERRUPT;
 550
 551                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 552                         pc->flags |= PC_FLAG_DMA_OK;
 553
 554                 return idescsi_issue_pc(drive, pc);
 555         }
 556         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 557         idescsi_end_request (drive, 0, 0);
 558         return ide_stopped;
 559 }
 560
 561 #ifdef CONFIG_IDE_PROC_FS
 562 static void idescsi_add_settings(ide_drive_t *drive)
 563 {
 564         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 565
 566 /*
 567  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 568  */
 569         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 570         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 571         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 572         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 573         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 574 }
 575 #else
 576 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 577 #endif
 578
 579 /*
 580  *      Driver initialization.
 581  */
 582 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 583 {
 584         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 585                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 586         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 587 #if IDESCSI_DEBUG_LOG
 588         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 589 #endif /* IDESCSI_DEBUG_LOG */
 590         idescsi_add_settings(drive);
 591 }
 592
 593 static void ide_scsi_remove(ide_drive_t *drive)
 594 {
 595         struct Scsi_Host *scsihost = drive->driver_data;
 596         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 597         struct gendisk *g = scsi->disk;
 598
 599         scsi_remove_host(scsihost);
 600         ide_proc_unregister_driver(drive, scsi->driver);
 601
 602         ide_unregister_region(g);
 603
 604         drive->driver_data = NULL;
 605         g->private_data = NULL;
 606         put_disk(g);
 607
 608         ide_scsi_put(scsi);
 609
 610         drive->scsi = 0;
 611 }
 612
 613 static int ide_scsi_probe(ide_drive_t *);
 614
 615 #ifdef CONFIG_IDE_PROC_FS
 616 static ide_proc_entry_t idescsi_proc[] = {
 617         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 618         { NULL, 0, NULL, NULL }
 619 };
 620 #endif
 621
 622 static ide_driver_t idescsi_driver = {
 623         .gen_driver = {
 624                 .owner          = THIS_MODULE,
 625                 .name           = "ide-scsi",
 626                 .bus            = &ide_bus_type,
 627         },
 628         .probe                  = ide_scsi_probe,
 629         .remove                 = ide_scsi_remove,
 630         .version                = IDESCSI_VERSION,
 631         .media                  = ide_scsi,
 632         .supports_dsc_overlap   = 0,
 633         .do_request             = idescsi_do_request,
 634         .end_request            = idescsi_end_request,
 635         .error                  = idescsi_atapi_error,
 636         .abort                  = idescsi_atapi_abort,
 637 #ifdef CONFIG_IDE_PROC_FS
 638         .proc                   = idescsi_proc,
 639 #endif
 640 };
 641
 642 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 643 {
 644         struct gendisk *disk = inode->i_bdev->bd_disk;
 645         struct ide_scsi_obj *scsi;
 646
 647         if (!(scsi = ide_scsi_get(disk)))
 648                 return -ENXIO;
 649
 650         return 0;
 651 }
 652
 653 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 654 {
 655         struct gendisk *disk = inode->i_bdev->bd_disk;
 656         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 657
 658         ide_scsi_put(scsi);
 659
 660         return 0;
 661 }
 662
 663 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 664                         unsigned int cmd, unsigned long arg)
 665 {
 666         struct block_device *bdev = inode->i_bdev;
 667         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 668         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 669 }
 670
 671 static struct block_device_operations idescsi_ops = {
 672         .owner          = THIS_MODULE,
 673         .open           = idescsi_ide_open,
 674         .release        = idescsi_ide_release,
 675         .ioctl          = idescsi_ide_ioctl,
 676 };
 677
 678 static int idescsi_slave_configure(struct scsi_device * sdp)
 679 {
 680         /* Configure detected device */
 681         sdp->use_10_for_rw = 1;
 682         sdp->use_10_for_ms = 1;
 683         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 684         return 0;
 685 }
 686
 687 static const char *idescsi_info (struct Scsi_Host *host)
 688 {
 689         return "SCSI host adapter emulation for IDE ATAPI devices";
 690 }
 691
 692 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 693 {
 694         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 695
 696         if (cmd == SG_SET_TRANSFORM) {
 697                 if (arg)
 698                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 699                 else
 700                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 701                 return 0;
 702         } else if (cmd == SG_GET_TRANSFORM)
 703                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 704         return -EINVAL;
 705 }
 706
 707 static int idescsi_queue (struct scsi_cmnd *cmd,
 708                 void (*done)(struct scsi_cmnd *))
 709 {
 710         struct Scsi_Host *host = cmd->device->host;
 711         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 712         ide_drive_t *drive = scsi->drive;
 713         struct request *rq = NULL;
 714         struct ide_atapi_pc *pc = NULL;
 715
 716         if (!drive) {
 717                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 718                 goto abort;
 719         }
 720         scsi = drive_to_idescsi(drive);
 721         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 722         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 723         if (rq == NULL || pc == NULL) {
 724                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 725                 goto abort;
 726         }
 727
 728         memset (pc->c, 0, 12);
 729         pc->flags = 0;
 730         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 731                 pc->flags |= PC_FLAG_WRITING;
 732         pc->rq = rq;
 733         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 734         pc->buf = NULL;
 735         pc->sg = scsi_sglist(cmd);
 736         pc->sg_cnt = scsi_sg_count(cmd);
 737         pc->b_count = 0;
 738         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 739         pc->scsi_cmd = cmd;
 740         pc->done = done;
 741         pc->timeout = jiffies + cmd->timeout_per_command;
 742         pc->callback = ide_scsi_callback;
 743
 744         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 745                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 746                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 747                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 748                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 749                         ide_scsi_hex_dump(pc->c, 12);
 750                 }
 751         }
 752
 753         blk_rq_init(NULL, rq);
 754         rq->special = (char *) pc;
 755         rq->cmd_type = REQ_TYPE_SPECIAL;
 756         spin_unlock_irq(host->host_lock);
 757         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 758         spin_lock_irq(host->host_lock);
 759         return 0;
 760 abort:
 761         kfree (pc);
 762         kfree (rq);
 763         cmd->result = DID_ERROR << 16;
 764         done(cmd);
 765         return 0;
 766 }
 767
 768 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 769 {
 770         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 771         ide_drive_t    *drive = scsi->drive;
 772         int             busy;
 773         int             ret   = FAILED;
 774
 775         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 776
 777         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 778                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 779
 780         if (!drive) {
 781                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 782                 WARN_ON(1);
 783                 goto no_drive;
 784         }
 785
 786         /* First give it some more time, how much is "right" is hard to say :-( */
 787
 788         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 789         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 790                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 791
 792         spin_lock_irq(&ide_lock);
 793
 794         /* If there is no pc running we're done (our interrupt took care of it) */
 795         if (!scsi->pc) {
 796                 ret = SUCCESS;
 797                 goto ide_unlock;
 798         }
 799
 800         /* It's somewhere in flight. Does ide subsystem agree? */
 801         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 802             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 803                 /*
 804                  * FIXME - not sure this condition can ever occur
 805                  */
 806                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 807
 808                 if (blk_sense_request(scsi->pc->rq))
 809                         kfree(scsi->pc->buf);
 810                 kfree(scsi->pc->rq);
 811                 kfree(scsi->pc);
 812                 scsi->pc = NULL;
 813
 814                 ret = SUCCESS;
 815         }
 816
 817 ide_unlock:
 818         spin_unlock_irq(&ide_lock);
 819 no_drive:
 820         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 821                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 822
 823         return ret;
 824 }
 825
 826 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 827 {
 828         struct request *req;
 829         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 830         ide_drive_t    *drive = scsi->drive;
 831         int             ready = 0;
 832         int             ret   = SUCCESS;
 833
 834         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 835
 836         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 837                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 838
 839         if (!drive) {
 840                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 841                 WARN_ON(1);
 842                 return FAILED;
 843         }
 844
 845         spin_lock_irq(cmd->device->host->host_lock);
 846         spin_lock(&ide_lock);
 847
 848         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 849                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 850                 spin_unlock(&ide_lock);
 851                 spin_unlock_irq(cmd->device->host->host_lock);
 852                 return FAILED;
 853         }
 854
 855         /* kill current request */
 856         if (__blk_end_request(req, -EIO, 0))
 857                 BUG();
 858         if (blk_sense_request(req))
 859                 kfree(scsi->pc->buf);
 860         kfree(scsi->pc);
 861         scsi->pc = NULL;
 862         kfree(req);
 863
 864         /* now nuke the drive queue */
 865         while ((req = elv_next_request(drive->queue))) {
 866                 if (__blk_end_request(req, -EIO, 0))
 867                         BUG();
 868         }
 869
 870         HWGROUP(drive)->rq = NULL;
 871         HWGROUP(drive)->handler = NULL;
 872         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 873         spin_unlock(&ide_lock);
 874
 875         ide_do_reset(drive);
 876
 877         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 878
 879         do {
 880                 spin_unlock_irq(cmd->device->host->host_lock);
 881                 msleep(50);
 882                 spin_lock_irq(cmd->device->host->host_lock);
 883         } while ( HWGROUP(drive)->handler );
 884
 885         ready = drive_is_ready(drive);
 886         HWGROUP(drive)->busy--;
 887         if (!ready) {
 888                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 889                 ret = FAILED;
 890         }
 891
 892         spin_unlock_irq(cmd->device->host->host_lock);
 893         return ret;
 894 }
 895
 896 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 897                 sector_t capacity, int *parm)
 898 {
 899         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 900         ide_drive_t *drive = idescsi->drive;
 901
 902         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 903                 parm[0] = drive->bios_head;
 904                 parm[1] = drive->bios_sect;
 905                 parm[2] = drive->bios_cyl;
 906         }
 907         return 0;
 908 }
 909
 910 static struct scsi_host_template idescsi_template = {
 911         .module                 = THIS_MODULE,
 912         .name                   = "idescsi",
 913         .info                   = idescsi_info,
 914         .slave_configure        = idescsi_slave_configure,
 915         .ioctl                  = idescsi_ioctl,
 916         .queuecommand           = idescsi_queue,
 917         .eh_abort_handler       = idescsi_eh_abort,
 918         .eh_host_reset_handler  = idescsi_eh_reset,
 919         .bios_param             = idescsi_bios,
 920         .can_queue              = 40,
 921         .this_id                = -1,
 922         .sg_tablesize           = 256,
 923         .cmd_per_lun            = 5,
 924         .max_sectors            = 128,
 925         .use_clustering         = DISABLE_CLUSTERING,
 926         .emulated               = 1,
 927         .proc_name              = "ide-scsi",
 928 };
 929
 930 static int ide_scsi_probe(ide_drive_t *drive)
 931 {
 932         idescsi_scsi_t *idescsi;
 933         struct Scsi_Host *host;
 934         struct gendisk *g;
 935         static int warned;
 936         int err = -ENOMEM;
 937
 938         if (!warned && drive->media == ide_cdrom) {
 939                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 940                 warned = 1;
 941         }
 942
 943         if (idescsi_nocd && drive->media == ide_cdrom)
 944                 return -ENODEV;
 945
 946         if (!strstr("ide-scsi", drive->driver_req) ||
 947             !drive->present ||
 948             drive->media == ide_disk ||
 949             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 950                 return -ENODEV;
 951
 952         drive->scsi = 1;
 953
 954         g = alloc_disk(1 << PARTN_BITS);
 955         if (!g)
 956                 goto out_host_put;
 957
 958         ide_init_disk(g, drive);
 959
 960         host->max_id = 1;
 961
 962         if (drive->id->last_lun)
 963                 debug_log("%s: id->last_lun=%u\n", drive->name,
 964                           drive->id->last_lun);
 965
 966         if ((drive->id->last_lun & 0x7) != 7)
 967                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 968         else
 969                 host->max_lun = 1;
 970
 971         drive->driver_data = host;
 972         idescsi = scsihost_to_idescsi(host);
 973         idescsi->drive = drive;
 974         idescsi->driver = &idescsi_driver;
 975         idescsi->host = host;
 976         idescsi->disk = g;
 977         g->private_data = &idescsi->driver;
 978         ide_proc_register_driver(drive, &idescsi_driver);
 979         err = 0;
 980         idescsi_setup(drive, idescsi);
 981         g->fops = &idescsi_ops;
 982         ide_register_region(g);
 983         err = scsi_add_host(host, &drive->gendev);
 984         if (!err) {
 985                 scsi_scan_host(host);
 986                 return 0;
 987         }
 988         /* fall through on error */
 989         ide_unregister_region(g);
 990         ide_proc_unregister_driver(drive, &idescsi_driver);
 991
 992         put_disk(g);
 993 out_host_put:
 994         drive->scsi = 0;
 995         scsi_host_put(host);
 996         return err;
 997 }
 998
 999 static int __init init_idescsi_module(void)
1000 {
1001         return driver_register(&idescsi_driver.gen_driver);
1002 }
1003
1004 static void __exit exit_idescsi_module(void)
1005 {
1006         driver_unregister(&idescsi_driver.gen_driver);
1007 }
1008
1009 module_param(idescsi_nocd, int, 0600);
1010 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1011 module_init(init_idescsi_module);
1012 module_exit(exit_idescsi_module);
1013 MODULE_LICENSE("GPL");