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