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