SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 /*
  64  *      SCSI command transformation layer
  65  */
  66 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  67
  68 /*
  69  *      Log flags
  70  */
  71 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  72
  73 typedef struct ide_scsi_obj {
  74         ide_drive_t             *drive;
  75         ide_driver_t            *driver;
  76         struct gendisk          *disk;
  77         struct Scsi_Host        *host;
  78
  79         struct ide_atapi_pc *pc;                /* Current packet command */
  80         unsigned long flags;                    /* Status/Action flags */
  81         unsigned long transform;                /* SCSI cmd translation layer */
  82         unsigned long log;                      /* log flags */
  83 } idescsi_scsi_t;
  84
  85 static DEFINE_MUTEX(idescsi_ref_mutex);
  86 /* Set by module param to skip cd */
  87 static int idescsi_nocd;
  88
  89 #define ide_scsi_g(disk) \
  90         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  91
  92 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
  93 {
  94         struct ide_scsi_obj *scsi = NULL;
  95
  96         mutex_lock(&idescsi_ref_mutex);
  97         scsi = ide_scsi_g(disk);
  98         if (scsi)
  99                 scsi_host_get(scsi->host);
 100         mutex_unlock(&idescsi_ref_mutex);
 101         return scsi;
 102 }
 103
 104 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 105 {
 106         mutex_lock(&idescsi_ref_mutex);
 107         scsi_host_put(scsi->host);
 108         mutex_unlock(&idescsi_ref_mutex);
 109 }
 110
 111 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 112 {
 113         return (idescsi_scsi_t*) (&host[1]);
 114 }
 115
 116 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 117 {
 118         return scsihost_to_idescsi(ide_drive->driver_data);
 119 }
 120
 121 /*
 122  *      Per ATAPI device status bits.
 123  */
 124 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 125
 126 /*
 127  *      ide-scsi requests.
 128  */
 129 #define IDESCSI_PC_RQ                   90
 130
 131 /*
 132  *      PIO data transfer routines using the scatter gather table.
 133  */
 134 static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 135                 unsigned int bcount)
 136 {
 137         ide_hwif_t *hwif = drive->hwif;
 138         int count;
 139         char *buf;
 140
 141         while (bcount) {
 142                 count = min(pc->sg->length - pc->b_count, bcount);
 143                 if (PageHighMem(sg_page(pc->sg))) {
 144                         unsigned long flags;
 145
 146                         local_irq_save(flags);
 147                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 148                                         pc->sg->offset;
 149                         hwif->input_data(drive, NULL, buf + pc->b_count, count);
 150                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 151                         local_irq_restore(flags);
 152                 } else {
 153                         buf = sg_virt(pc->sg);
 154                         hwif->input_data(drive, NULL, buf + pc->b_count, count);
 155                 }
 156                 bcount -= count; pc->b_count += count;
 157                 if (pc->b_count == pc->sg->length) {
 158                         if (!--pc->sg_cnt)
 159                                 break;
 160                         pc->sg = sg_next(pc->sg);
 161                         pc->b_count = 0;
 162                 }
 163         }
 164
 165         if (bcount) {
 166                 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 167                 ide_pad_transfer(drive, 0, bcount);
 168         }
 169 }
 170
 171 static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 172                 unsigned int bcount)
 173 {
 174         ide_hwif_t *hwif = drive->hwif;
 175         int count;
 176         char *buf;
 177
 178         while (bcount) {
 179                 count = min(pc->sg->length - pc->b_count, bcount);
 180                 if (PageHighMem(sg_page(pc->sg))) {
 181                         unsigned long flags;
 182
 183                         local_irq_save(flags);
 184                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 185                                                 pc->sg->offset;
 186                         hwif->output_data(drive, NULL, buf + pc->b_count, count);
 187                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 188                         local_irq_restore(flags);
 189                 } else {
 190                         buf = sg_virt(pc->sg);
 191                         hwif->output_data(drive, NULL, buf + pc->b_count, count);
 192                 }
 193                 bcount -= count; pc->b_count += count;
 194                 if (pc->b_count == pc->sg->length) {
 195                         if (!--pc->sg_cnt)
 196                                 break;
 197                         pc->sg = sg_next(pc->sg);
 198                         pc->b_count = 0;
 199                 }
 200         }
 201
 202         if (bcount) {
 203                 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 204                 ide_pad_transfer(drive, 1, bcount);
 205         }
 206 }
 207
 208 static void ide_scsi_hex_dump(u8 *data, int len)
 209 {
 210         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 211 }
 212
 213 static int idescsi_check_condition(ide_drive_t *drive,
 214                 struct request *failed_cmd)
 215 {
 216         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 217         struct ide_atapi_pc   *pc;
 218         struct request *rq;
 219         u8             *buf;
 220
 221         /* stuff a sense request in front of our current request */
 222         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 223         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 224         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 225         if (!pc || !rq || !buf) {
 226                 kfree(buf);
 227                 kfree(rq);
 228                 kfree(pc);
 229                 return -ENOMEM;
 230         }
 231         blk_rq_init(NULL, rq);
 232         rq->special = (char *) pc;
 233         pc->rq = rq;
 234         pc->buf = buf;
 235         pc->c[0] = REQUEST_SENSE;
 236         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 237         rq->cmd_type = REQ_TYPE_SENSE;
 238         rq->cmd_flags |= REQ_PREEMPT;
 239         pc->timeout = jiffies + WAIT_READY;
 240         /* NOTE! Save the failed packet command in "rq->buffer" */
 241         rq->buffer = (void *) failed_cmd->special;
 242         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 243         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 244                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 245                 ide_scsi_hex_dump(pc->c, 6);
 246         }
 247         rq->rq_disk = scsi->disk;
 248         ide_do_drive_cmd(drive, rq);
 249         return 0;
 250 }
 251
 252 static int idescsi_end_request(ide_drive_t *, int, int);
 253
 254 static ide_startstop_t
 255 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 256 {
 257         ide_hwif_t *hwif = drive->hwif;
 258
 259         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 260                 /* force an abort */
 261                 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
 262                                hwif->io_ports.command_addr);
 263
 264         rq->errors++;
 265
 266         idescsi_end_request(drive, 0, 0);
 267
 268         return ide_stopped;
 269 }
 270
 271 static ide_startstop_t
 272 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 273 {
 274 #if IDESCSI_DEBUG_LOG
 275         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 276                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 277 #endif
 278         rq->errors |= ERROR_MAX;
 279
 280         idescsi_end_request(drive, 0, 0);
 281
 282         return ide_stopped;
 283 }
 284
 285 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 286 {
 287         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 288         struct request *rq = HWGROUP(drive)->rq;
 289         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 290         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 291         struct Scsi_Host *host;
 292         int errors = rq->errors;
 293         unsigned long flags;
 294
 295         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 296                 ide_end_request(drive, uptodate, nrsecs);
 297                 return 0;
 298         }
 299         ide_end_drive_cmd (drive, 0, 0);
 300         if (blk_sense_request(rq)) {
 301                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 302                 if (log) {
 303                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 304                         ide_scsi_hex_dump(pc->buf, 16);
 305                 }
 306                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 307                         SCSI_SENSE_BUFFERSIZE);
 308                 kfree(pc->buf);
 309                 kfree(pc);
 310                 kfree(rq);
 311                 pc = opc;
 312                 rq = pc->rq;
 313                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 314                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 315                                   DID_TIME_OUT :
 316                                   DID_OK) << 16);
 317         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 318                 if (log)
 319                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 320                                         drive->name, pc->scsi_cmd->serial_number);
 321                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 322         } else if (errors >= ERROR_MAX) {
 323                 pc->scsi_cmd->result = DID_ERROR << 16;
 324                 if (log)
 325                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 326         } else if (errors) {
 327                 if (log)
 328                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 329                 if (!idescsi_check_condition(drive, rq))
 330                         /* we started a request sense, so we'll be back, exit for now */
 331                         return 0;
 332                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 333         } else {
 334                 pc->scsi_cmd->result = DID_OK << 16;
 335         }
 336         host = pc->scsi_cmd->device->host;
 337         spin_lock_irqsave(host->host_lock, flags);
 338         pc->done(pc->scsi_cmd);
 339         spin_unlock_irqrestore(host->host_lock, flags);
 340         kfree(pc);
 341         kfree(rq);
 342         scsi->pc = NULL;
 343         return 0;
 344 }
 345
 346 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 347 {
 348         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 349 }
 350
 351 static int idescsi_expiry(ide_drive_t *drive)
 352 {
 353         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 354         struct ide_atapi_pc   *pc   = scsi->pc;
 355
 356 #if IDESCSI_DEBUG_LOG
 357         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 358 #endif
 359         pc->flags |= PC_FLAG_TIMEDOUT;
 360
 361         return 0;                                       /* we do not want the ide subsystem to retry */
 362 }
 363
 364 /*
 365  *      Our interrupt handler.
 366  */
 367 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 368 {
 369         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 370         ide_hwif_t *hwif = drive->hwif;
 371         struct ide_atapi_pc *pc = scsi->pc;
 372         struct request *rq = pc->rq;
 373         unsigned int temp;
 374         u16 bcount;
 375         u8 stat, ireason;
 376
 377 #if IDESCSI_DEBUG_LOG
 378         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 379 #endif /* IDESCSI_DEBUG_LOG */
 380
 381         if (pc->flags & PC_FLAG_TIMEDOUT) {
 382 #if IDESCSI_DEBUG_LOG
 383                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 384                                 pc->scsi_cmd->serial_number, jiffies);
 385 #endif
 386                 /* end this request now - scsi should retry it*/
 387                 idescsi_end_request (drive, 1, 0);
 388                 return ide_stopped;
 389         }
 390         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 391                 if (hwif->dma_ops->dma_end(drive))
 392                         pc->flags |= PC_FLAG_DMA_ERROR;
 393                 else
 394                         pc->xferred = pc->req_xfer;
 395 #if IDESCSI_DEBUG_LOG
 396                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 397 #endif /* IDESCSI_DEBUG_LOG */
 398         }
 399
 400         /* Clear the interrupt */
 401         stat = ide_read_status(drive);
 402
 403         if ((stat & DRQ_STAT) == 0) {
 404                 /* No more interrupts */
 405                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 406                         printk(KERN_INFO "Packet command completed, %d bytes"
 407                                         " transferred\n", pc->xferred);
 408                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 409                 local_irq_enable_in_hardirq();
 410                 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
 411                         rq->errors++;
 412                 idescsi_end_request (drive, 1, 0);
 413                 return ide_stopped;
 414         }
 415         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 416                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 417                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 418                                 "in DMA mode\n", drive->name);
 419                 ide_dma_off(drive);
 420                 return ide_do_reset(drive);
 421         }
 422         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 423                   hwif->INB(hwif->io_ports.lbam_addr);
 424         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 425
 426         if (ireason & CD) {
 427                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 428                 return ide_do_reset (drive);
 429         }
 430         if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
 431                 /* Hopefully, we will never get here */
 432                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 433                                 "to %s!\n", drive->name,
 434                                 (ireason & IO) ? "Write" : "Read",
 435                                 (ireason & IO) ? "Read" : "Write");
 436                 return ide_do_reset(drive);
 437         }
 438         if (!(pc->flags & PC_FLAG_WRITING)) {
 439                 temp = pc->xferred + bcount;
 440                 if (temp > pc->req_xfer) {
 441                         if (temp > pc->buf_size) {
 442                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 443                                         "send us more data than expected "
 444                                         "- discarding data\n");
 445                                 temp = pc->buf_size - pc->xferred;
 446                                 if (temp) {
 447                                         if (pc->sg)
 448                                                 idescsi_input_buffers(drive, pc,
 449                                                                         temp);
 450                                         else
 451                                                 hwif->input_data(drive, NULL,
 452                                                         pc->cur_pos, temp);
 453                                         printk(KERN_ERR "ide-scsi: transferred"
 454                                                         " %d of %d bytes\n",
 455                                                         temp, bcount);
 456                                 }
 457                                 pc->xferred += temp;
 458                                 pc->cur_pos += temp;
 459                                 ide_pad_transfer(drive, 0, bcount - temp);
 460                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 461                                 return ide_started;
 462                         }
 463 #if IDESCSI_DEBUG_LOG
 464                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 465 #endif /* IDESCSI_DEBUG_LOG */
 466                 }
 467                 if (pc->sg)
 468                         idescsi_input_buffers(drive, pc, bcount);
 469                 else
 470                         hwif->input_data(drive, NULL, pc->cur_pos, bcount);
 471         } else {
 472                 if (pc->sg)
 473                         idescsi_output_buffers(drive, pc, bcount);
 474                 else
 475                         hwif->output_data(drive, NULL, pc->cur_pos, bcount);
 476         }
 477         /* Update the current position */
 478         pc->xferred += bcount;
 479         pc->cur_pos += bcount;
 480
 481         /* And set the interrupt handler again */
 482         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 483         return ide_started;
 484 }
 485
 486 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 487 {
 488         ide_hwif_t *hwif = drive->hwif;
 489         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 490         struct ide_atapi_pc *pc = scsi->pc;
 491         ide_startstop_t startstop;
 492         u8 ireason;
 493
 494         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 495                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 496                         "initiated yet DRQ isn't asserted\n");
 497                 return startstop;
 498         }
 499         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 500         if ((ireason & CD) == 0 || (ireason & IO)) {
 501                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 502                                 "issuing a packet command\n");
 503                 return ide_do_reset (drive);
 504         }
 505         BUG_ON(HWGROUP(drive)->handler != NULL);
 506         /* Set the interrupt routine */
 507         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 508
 509         if (pc->flags & PC_FLAG_DMA_OK) {
 510                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 511                 hwif->dma_ops->dma_start(drive);
 512         }
 513
 514         /* Send the actual packet */
 515         hwif->output_data(drive, NULL, scsi->pc->c, 12);
 516
 517         return ide_started;
 518 }
 519
 520 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 521 {
 522         switch (pc->c[0]) {
 523                 case READ_6: case READ_10: case READ_12:
 524                         pc->flags &= ~PC_FLAG_WRITING;
 525                         return 0;
 526                 case WRITE_6: case WRITE_10: case WRITE_12:
 527                         pc->flags |= PC_FLAG_WRITING;
 528                         return 0;
 529                 default:
 530                         return 1;
 531         }
 532 }
 533
 534 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 535 {
 536         ide_hwif_t *hwif = drive->hwif;
 537         struct scatterlist *sg, *scsi_sg;
 538         int segments;
 539
 540         if (!pc->req_xfer || pc->req_xfer % 1024)
 541                 return 1;
 542
 543         if (idescsi_set_direction(pc))
 544                 return 1;
 545
 546         sg = hwif->sg_table;
 547         scsi_sg = scsi_sglist(pc->scsi_cmd);
 548         segments = scsi_sg_count(pc->scsi_cmd);
 549
 550         if (segments > hwif->sg_max_nents)
 551                 return 1;
 552
 553         hwif->sg_nents = segments;
 554         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 555
 556         return 0;
 557 }
 558
 559 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 560                 struct ide_atapi_pc *pc)
 561 {
 562         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 563         ide_hwif_t *hwif = drive->hwif;
 564         u16 bcount;
 565         u8 dma = 0;
 566
 567         /* Set the current packet command */
 568         scsi->pc = pc;
 569         /* We haven't transferred any data yet */
 570         pc->xferred = 0;
 571         pc->cur_pos = pc->buf;
 572         /* Request to transfer the entire buffer at once */
 573         bcount = min(pc->req_xfer, 63 * 1024);
 574
 575         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 576                 hwif->sg_mapped = 1;
 577                 dma = !hwif->dma_ops->dma_setup(drive);
 578                 hwif->sg_mapped = 0;
 579         }
 580
 581         ide_pktcmd_tf_load(drive, 0, bcount, dma);
 582
 583         if (dma)
 584                 pc->flags |= PC_FLAG_DMA_OK;
 585
 586         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 587                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
 588                                     get_timeout(pc), idescsi_expiry);
 589                 return ide_started;
 590         } else {
 591                 /* Issue the packet command */
 592                 ide_execute_pkt_cmd(drive);
 593                 return idescsi_transfer_pc(drive);
 594         }
 595 }
 596
 597 /*
 598  *      idescsi_do_request is our request handling function.
 599  */
 600 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 601 {
 602 #if IDESCSI_DEBUG_LOG
 603         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 604         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 605 #endif /* IDESCSI_DEBUG_LOG */
 606
 607         if (blk_sense_request(rq) || blk_special_request(rq)) {
 608                 return idescsi_issue_pc(drive,
 609                                 (struct ide_atapi_pc *) rq->special);
 610         }
 611         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 612         idescsi_end_request (drive, 0, 0);
 613         return ide_stopped;
 614 }
 615
 616 #ifdef CONFIG_IDE_PROC_FS
 617 static void idescsi_add_settings(ide_drive_t *drive)
 618 {
 619         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 620
 621 /*
 622  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 623  */
 624         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 625         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 626         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 627         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 628         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 629 }
 630 #else
 631 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 632 #endif
 633
 634 /*
 635  *      Driver initialization.
 636  */
 637 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 638 {
 639         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 640                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 641         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 642 #if IDESCSI_DEBUG_LOG
 643         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 644 #endif /* IDESCSI_DEBUG_LOG */
 645         idescsi_add_settings(drive);
 646 }
 647
 648 static void ide_scsi_remove(ide_drive_t *drive)
 649 {
 650         struct Scsi_Host *scsihost = drive->driver_data;
 651         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 652         struct gendisk *g = scsi->disk;
 653
 654         scsi_remove_host(scsihost);
 655         ide_proc_unregister_driver(drive, scsi->driver);
 656
 657         ide_unregister_region(g);
 658
 659         drive->driver_data = NULL;
 660         g->private_data = NULL;
 661         put_disk(g);
 662
 663         ide_scsi_put(scsi);
 664 }
 665
 666 static int ide_scsi_probe(ide_drive_t *);
 667
 668 #ifdef CONFIG_IDE_PROC_FS
 669 static ide_proc_entry_t idescsi_proc[] = {
 670         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 671         { NULL, 0, NULL, NULL }
 672 };
 673 #endif
 674
 675 static ide_driver_t idescsi_driver = {
 676         .gen_driver = {
 677                 .owner          = THIS_MODULE,
 678                 .name           = "ide-scsi",
 679                 .bus            = &ide_bus_type,
 680         },
 681         .probe                  = ide_scsi_probe,
 682         .remove                 = ide_scsi_remove,
 683         .version                = IDESCSI_VERSION,
 684         .media                  = ide_scsi,
 685         .supports_dsc_overlap   = 0,
 686         .do_request             = idescsi_do_request,
 687         .end_request            = idescsi_end_request,
 688         .error                  = idescsi_atapi_error,
 689         .abort                  = idescsi_atapi_abort,
 690 #ifdef CONFIG_IDE_PROC_FS
 691         .proc                   = idescsi_proc,
 692 #endif
 693 };
 694
 695 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 696 {
 697         struct gendisk *disk = inode->i_bdev->bd_disk;
 698         struct ide_scsi_obj *scsi;
 699
 700         if (!(scsi = ide_scsi_get(disk)))
 701                 return -ENXIO;
 702
 703         return 0;
 704 }
 705
 706 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 707 {
 708         struct gendisk *disk = inode->i_bdev->bd_disk;
 709         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 710
 711         ide_scsi_put(scsi);
 712
 713         return 0;
 714 }
 715
 716 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 717                         unsigned int cmd, unsigned long arg)
 718 {
 719         struct block_device *bdev = inode->i_bdev;
 720         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 721         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 722 }
 723
 724 static struct block_device_operations idescsi_ops = {
 725         .owner          = THIS_MODULE,
 726         .open           = idescsi_ide_open,
 727         .release        = idescsi_ide_release,
 728         .ioctl          = idescsi_ide_ioctl,
 729 };
 730
 731 static int idescsi_slave_configure(struct scsi_device * sdp)
 732 {
 733         /* Configure detected device */
 734         sdp->use_10_for_rw = 1;
 735         sdp->use_10_for_ms = 1;
 736         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 737         return 0;
 738 }
 739
 740 static const char *idescsi_info (struct Scsi_Host *host)
 741 {
 742         return "SCSI host adapter emulation for IDE ATAPI devices";
 743 }
 744
 745 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 746 {
 747         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 748
 749         if (cmd == SG_SET_TRANSFORM) {
 750                 if (arg)
 751                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 752                 else
 753                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 754                 return 0;
 755         } else if (cmd == SG_GET_TRANSFORM)
 756                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 757         return -EINVAL;
 758 }
 759
 760 static int idescsi_queue (struct scsi_cmnd *cmd,
 761                 void (*done)(struct scsi_cmnd *))
 762 {
 763         struct Scsi_Host *host = cmd->device->host;
 764         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 765         ide_drive_t *drive = scsi->drive;
 766         struct request *rq = NULL;
 767         struct ide_atapi_pc *pc = NULL;
 768
 769         if (!drive) {
 770                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 771                 goto abort;
 772         }
 773         scsi = drive_to_idescsi(drive);
 774         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 775         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 776         if (rq == NULL || pc == NULL) {
 777                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 778                 goto abort;
 779         }
 780
 781         memset (pc->c, 0, 12);
 782         pc->flags = 0;
 783         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 784                 pc->flags |= PC_FLAG_WRITING;
 785         pc->rq = rq;
 786         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 787         pc->buf = NULL;
 788         pc->sg = scsi_sglist(cmd);
 789         pc->sg_cnt = scsi_sg_count(cmd);
 790         pc->b_count = 0;
 791         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 792         pc->scsi_cmd = cmd;
 793         pc->done = done;
 794         pc->timeout = jiffies + cmd->timeout_per_command;
 795
 796         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 797                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 798                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 799                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 800                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 801                         ide_scsi_hex_dump(pc->c, 12);
 802                 }
 803         }
 804
 805         blk_rq_init(NULL, rq);
 806         rq->special = (char *) pc;
 807         rq->cmd_type = REQ_TYPE_SPECIAL;
 808         spin_unlock_irq(host->host_lock);
 809         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 810         spin_lock_irq(host->host_lock);
 811         return 0;
 812 abort:
 813         kfree (pc);
 814         kfree (rq);
 815         cmd->result = DID_ERROR << 16;
 816         done(cmd);
 817         return 0;
 818 }
 819
 820 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 821 {
 822         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 823         ide_drive_t    *drive = scsi->drive;
 824         int             busy;
 825         int             ret   = FAILED;
 826
 827         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 828
 829         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 830                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 831
 832         if (!drive) {
 833                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 834                 WARN_ON(1);
 835                 goto no_drive;
 836         }
 837
 838         /* First give it some more time, how much is "right" is hard to say :-( */
 839
 840         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 841         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 842                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 843
 844         spin_lock_irq(&ide_lock);
 845
 846         /* If there is no pc running we're done (our interrupt took care of it) */
 847         if (!scsi->pc) {
 848                 ret = SUCCESS;
 849                 goto ide_unlock;
 850         }
 851
 852         /* It's somewhere in flight. Does ide subsystem agree? */
 853         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 854             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 855                 /*
 856                  * FIXME - not sure this condition can ever occur
 857                  */
 858                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 859
 860                 if (blk_sense_request(scsi->pc->rq))
 861                         kfree(scsi->pc->buf);
 862                 kfree(scsi->pc->rq);
 863                 kfree(scsi->pc);
 864                 scsi->pc = NULL;
 865
 866                 ret = SUCCESS;
 867         }
 868
 869 ide_unlock:
 870         spin_unlock_irq(&ide_lock);
 871 no_drive:
 872         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 873                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 874
 875         return ret;
 876 }
 877
 878 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 879 {
 880         struct request *req;
 881         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 882         ide_drive_t    *drive = scsi->drive;
 883         int             ready = 0;
 884         int             ret   = SUCCESS;
 885
 886         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 887
 888         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 889                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 890
 891         if (!drive) {
 892                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 893                 WARN_ON(1);
 894                 return FAILED;
 895         }
 896
 897         spin_lock_irq(cmd->device->host->host_lock);
 898         spin_lock(&ide_lock);
 899
 900         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 901                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 902                 spin_unlock(&ide_lock);
 903                 spin_unlock_irq(cmd->device->host->host_lock);
 904                 return FAILED;
 905         }
 906
 907         /* kill current request */
 908         if (__blk_end_request(req, -EIO, 0))
 909                 BUG();
 910         if (blk_sense_request(req))
 911                 kfree(scsi->pc->buf);
 912         kfree(scsi->pc);
 913         scsi->pc = NULL;
 914         kfree(req);
 915
 916         /* now nuke the drive queue */
 917         while ((req = elv_next_request(drive->queue))) {
 918                 if (__blk_end_request(req, -EIO, 0))
 919                         BUG();
 920         }
 921
 922         HWGROUP(drive)->rq = NULL;
 923         HWGROUP(drive)->handler = NULL;
 924         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 925         spin_unlock(&ide_lock);
 926
 927         ide_do_reset(drive);
 928
 929         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 930
 931         do {
 932                 spin_unlock_irq(cmd->device->host->host_lock);
 933                 msleep(50);
 934                 spin_lock_irq(cmd->device->host->host_lock);
 935         } while ( HWGROUP(drive)->handler );
 936
 937         ready = drive_is_ready(drive);
 938         HWGROUP(drive)->busy--;
 939         if (!ready) {
 940                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 941                 ret = FAILED;
 942         }
 943
 944         spin_unlock_irq(cmd->device->host->host_lock);
 945         return ret;
 946 }
 947
 948 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 949                 sector_t capacity, int *parm)
 950 {
 951         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 952         ide_drive_t *drive = idescsi->drive;
 953
 954         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 955                 parm[0] = drive->bios_head;
 956                 parm[1] = drive->bios_sect;
 957                 parm[2] = drive->bios_cyl;
 958         }
 959         return 0;
 960 }
 961
 962 static struct scsi_host_template idescsi_template = {
 963         .module                 = THIS_MODULE,
 964         .name                   = "idescsi",
 965         .info                   = idescsi_info,
 966         .slave_configure        = idescsi_slave_configure,
 967         .ioctl                  = idescsi_ioctl,
 968         .queuecommand           = idescsi_queue,
 969         .eh_abort_handler       = idescsi_eh_abort,
 970         .eh_host_reset_handler  = idescsi_eh_reset,
 971         .bios_param             = idescsi_bios,
 972         .can_queue              = 40,
 973         .this_id                = -1,
 974         .sg_tablesize           = 256,
 975         .cmd_per_lun            = 5,
 976         .max_sectors            = 128,
 977         .use_clustering         = DISABLE_CLUSTERING,
 978         .emulated               = 1,
 979         .proc_name              = "ide-scsi",
 980 };
 981
 982 static int ide_scsi_probe(ide_drive_t *drive)
 983 {
 984         idescsi_scsi_t *idescsi;
 985         struct Scsi_Host *host;
 986         struct gendisk *g;
 987         static int warned;
 988         int err = -ENOMEM;
 989
 990         if (!warned && drive->media == ide_cdrom) {
 991                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 992                 warned = 1;
 993         }
 994
 995         if (idescsi_nocd && drive->media == ide_cdrom)
 996                 return -ENODEV;
 997
 998         if (!strstr("ide-scsi", drive->driver_req) ||
 999             !drive->present ||
1000             drive->media == ide_disk ||
1001             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1002                 return -ENODEV;
1003
1004         g = alloc_disk(1 << PARTN_BITS);
1005         if (!g)
1006                 goto out_host_put;
1007
1008         ide_init_disk(g, drive);
1009
1010         host->max_id = 1;
1011
1012 #if IDESCSI_DEBUG_LOG
1013         if (drive->id->last_lun)
1014                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1015 #endif
1016         if ((drive->id->last_lun & 0x7) != 7)
1017                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1018         else
1019                 host->max_lun = 1;
1020
1021         drive->driver_data = host;
1022         idescsi = scsihost_to_idescsi(host);
1023         idescsi->drive = drive;
1024         idescsi->driver = &idescsi_driver;
1025         idescsi->host = host;
1026         idescsi->disk = g;
1027         g->private_data = &idescsi->driver;
1028         ide_proc_register_driver(drive, &idescsi_driver);
1029         err = 0;
1030         idescsi_setup(drive, idescsi);
1031         g->fops = &idescsi_ops;
1032         ide_register_region(g);
1033         err = scsi_add_host(host, &drive->gendev);
1034         if (!err) {
1035                 scsi_scan_host(host);
1036                 return 0;
1037         }
1038         /* fall through on error */
1039         ide_unregister_region(g);
1040         ide_proc_unregister_driver(drive, &idescsi_driver);
1041
1042         put_disk(g);
1043 out_host_put:
1044         scsi_host_put(host);
1045         return err;
1046 }
1047
1048 static int __init init_idescsi_module(void)
1049 {
1050         return driver_register(&idescsi_driver.gen_driver);
1051 }
1052
1053 static void __exit exit_idescsi_module(void)
1054 {
1055         driver_unregister(&idescsi_driver.gen_driver);
1056 }
1057
1058 module_param(idescsi_nocd, int, 0600);
1059 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1060 module_init(init_idescsi_module);
1061 module_exit(exit_idescsi_module);
1062 MODULE_LICENSE("GPL");