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 IDESCSI_DEBUG_LOG
 392                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 393 #endif /* IDESCSI_DEBUG_LOG */
 394                 pc->xferred = pc->req_xfer;
 395                 (void)hwif->dma_ops->dma_end(drive);
 396         }
 397
 398         /* Clear the interrupt */
 399         stat = ide_read_status(drive);
 400
 401         if ((stat & DRQ_STAT) == 0) {
 402                 /* No more interrupts */
 403                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 404                         printk(KERN_INFO "Packet command completed, %d bytes"
 405                                         " transferred\n", pc->xferred);
 406                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 407                 local_irq_enable_in_hardirq();
 408                 if (stat & ERR_STAT)
 409                         rq->errors++;
 410                 idescsi_end_request (drive, 1, 0);
 411                 return ide_stopped;
 412         }
 413         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 414                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 415                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 416                                 "in DMA mode\n", drive->name);
 417                 ide_dma_off(drive);
 418                 return ide_do_reset(drive);
 419         }
 420         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 421                   hwif->INB(hwif->io_ports.lbam_addr);
 422         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 423
 424         if (ireason & CD) {
 425                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 426                 return ide_do_reset (drive);
 427         }
 428         if (ireason & IO) {
 429                 temp = pc->xferred + bcount;
 430                 if (temp > pc->req_xfer) {
 431                         if (temp > pc->buf_size) {
 432                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 433                                         "send us more data than expected "
 434                                         "- discarding data\n");
 435                                 temp = pc->buf_size - pc->xferred;
 436                                 if (temp) {
 437                                         pc->flags &= ~PC_FLAG_WRITING;
 438                                         if (pc->sg)
 439                                                 idescsi_input_buffers(drive, pc,
 440                                                                         temp);
 441                                         else
 442                                                 hwif->input_data(drive, NULL,
 443                                                         pc->cur_pos, temp);
 444                                         printk(KERN_ERR "ide-scsi: transferred"
 445                                                         " %d of %d bytes\n",
 446                                                         temp, bcount);
 447                                 }
 448                                 pc->xferred += temp;
 449                                 pc->cur_pos += temp;
 450                                 ide_pad_transfer(drive, 0, bcount - temp);
 451                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 452                                 return ide_started;
 453                         }
 454 #if IDESCSI_DEBUG_LOG
 455                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 456 #endif /* IDESCSI_DEBUG_LOG */
 457                 }
 458         }
 459         if (ireason & IO) {
 460                 pc->flags &= ~PC_FLAG_WRITING;
 461                 if (pc->sg)
 462                         idescsi_input_buffers(drive, pc, bcount);
 463                 else
 464                         hwif->input_data(drive, NULL, pc->cur_pos, bcount);
 465         } else {
 466                 pc->flags |= PC_FLAG_WRITING;
 467                 if (pc->sg)
 468                         idescsi_output_buffers(drive, pc, bcount);
 469                 else
 470                         hwif->output_data(drive, NULL, pc->cur_pos, bcount);
 471         }
 472         /* Update the current position */
 473         pc->xferred += bcount;
 474         pc->cur_pos += bcount;
 475
 476         /* And set the interrupt handler again */
 477         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 478         return ide_started;
 479 }
 480
 481 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 482 {
 483         ide_hwif_t *hwif = drive->hwif;
 484         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 485         struct ide_atapi_pc *pc = scsi->pc;
 486         ide_startstop_t startstop;
 487         u8 ireason;
 488
 489         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 490                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 491                         "initiated yet DRQ isn't asserted\n");
 492                 return startstop;
 493         }
 494         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 495         if ((ireason & CD) == 0 || (ireason & IO)) {
 496                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 497                                 "issuing a packet command\n");
 498                 return ide_do_reset (drive);
 499         }
 500         BUG_ON(HWGROUP(drive)->handler != NULL);
 501         /* Set the interrupt routine */
 502         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 503
 504         if (pc->flags & PC_FLAG_DMA_OK) {
 505                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 506                 hwif->dma_ops->dma_start(drive);
 507         }
 508
 509         /* Send the actual packet */
 510         hwif->output_data(drive, NULL, scsi->pc->c, 12);
 511
 512         return ide_started;
 513 }
 514
 515 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 516 {
 517         switch (pc->c[0]) {
 518                 case READ_6: case READ_10: case READ_12:
 519                         pc->flags &= ~PC_FLAG_WRITING;
 520                         return 0;
 521                 case WRITE_6: case WRITE_10: case WRITE_12:
 522                         pc->flags |= PC_FLAG_WRITING;
 523                         return 0;
 524                 default:
 525                         return 1;
 526         }
 527 }
 528
 529 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 530 {
 531         ide_hwif_t *hwif = drive->hwif;
 532         struct scatterlist *sg, *scsi_sg;
 533         int segments;
 534
 535         if (!pc->req_xfer || pc->req_xfer % 1024)
 536                 return 1;
 537
 538         if (idescsi_set_direction(pc))
 539                 return 1;
 540
 541         sg = hwif->sg_table;
 542         scsi_sg = scsi_sglist(pc->scsi_cmd);
 543         segments = scsi_sg_count(pc->scsi_cmd);
 544
 545         if (segments > hwif->sg_max_nents)
 546                 return 1;
 547
 548         hwif->sg_nents = segments;
 549         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 550
 551         return 0;
 552 }
 553
 554 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 555                 struct ide_atapi_pc *pc)
 556 {
 557         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 558         ide_hwif_t *hwif = drive->hwif;
 559         u16 bcount;
 560         u8 dma = 0;
 561
 562         /* Set the current packet command */
 563         scsi->pc = pc;
 564         /* We haven't transferred any data yet */
 565         pc->xferred = 0;
 566         pc->cur_pos = pc->buf;
 567         /* Request to transfer the entire buffer at once */
 568         bcount = min(pc->req_xfer, 63 * 1024);
 569
 570         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 571                 hwif->sg_mapped = 1;
 572                 dma = !hwif->dma_ops->dma_setup(drive);
 573                 hwif->sg_mapped = 0;
 574         }
 575
 576         ide_pktcmd_tf_load(drive, 0, bcount, dma);
 577
 578         if (dma)
 579                 pc->flags |= PC_FLAG_DMA_OK;
 580
 581         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 582                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
 583                                     get_timeout(pc), idescsi_expiry);
 584                 return ide_started;
 585         } else {
 586                 /* Issue the packet command */
 587                 ide_execute_pkt_cmd(drive);
 588                 return idescsi_transfer_pc(drive);
 589         }
 590 }
 591
 592 /*
 593  *      idescsi_do_request is our request handling function.
 594  */
 595 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 596 {
 597 #if IDESCSI_DEBUG_LOG
 598         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 599         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 600 #endif /* IDESCSI_DEBUG_LOG */
 601
 602         if (blk_sense_request(rq) || blk_special_request(rq)) {
 603                 return idescsi_issue_pc(drive,
 604                                 (struct ide_atapi_pc *) rq->special);
 605         }
 606         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 607         idescsi_end_request (drive, 0, 0);
 608         return ide_stopped;
 609 }
 610
 611 #ifdef CONFIG_IDE_PROC_FS
 612 static void idescsi_add_settings(ide_drive_t *drive)
 613 {
 614         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 615
 616 /*
 617  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 618  */
 619         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 620         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 621         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 622         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 623         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 624 }
 625 #else
 626 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 627 #endif
 628
 629 /*
 630  *      Driver initialization.
 631  */
 632 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 633 {
 634         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 635                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 636         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 637 #if IDESCSI_DEBUG_LOG
 638         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 639 #endif /* IDESCSI_DEBUG_LOG */
 640         idescsi_add_settings(drive);
 641 }
 642
 643 static void ide_scsi_remove(ide_drive_t *drive)
 644 {
 645         struct Scsi_Host *scsihost = drive->driver_data;
 646         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 647         struct gendisk *g = scsi->disk;
 648
 649         scsi_remove_host(scsihost);
 650         ide_proc_unregister_driver(drive, scsi->driver);
 651
 652         ide_unregister_region(g);
 653
 654         drive->driver_data = NULL;
 655         g->private_data = NULL;
 656         put_disk(g);
 657
 658         ide_scsi_put(scsi);
 659 }
 660
 661 static int ide_scsi_probe(ide_drive_t *);
 662
 663 #ifdef CONFIG_IDE_PROC_FS
 664 static ide_proc_entry_t idescsi_proc[] = {
 665         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 666         { NULL, 0, NULL, NULL }
 667 };
 668 #endif
 669
 670 static ide_driver_t idescsi_driver = {
 671         .gen_driver = {
 672                 .owner          = THIS_MODULE,
 673                 .name           = "ide-scsi",
 674                 .bus            = &ide_bus_type,
 675         },
 676         .probe                  = ide_scsi_probe,
 677         .remove                 = ide_scsi_remove,
 678         .version                = IDESCSI_VERSION,
 679         .media                  = ide_scsi,
 680         .supports_dsc_overlap   = 0,
 681         .do_request             = idescsi_do_request,
 682         .end_request            = idescsi_end_request,
 683         .error                  = idescsi_atapi_error,
 684         .abort                  = idescsi_atapi_abort,
 685 #ifdef CONFIG_IDE_PROC_FS
 686         .proc                   = idescsi_proc,
 687 #endif
 688 };
 689
 690 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 691 {
 692         struct gendisk *disk = inode->i_bdev->bd_disk;
 693         struct ide_scsi_obj *scsi;
 694
 695         if (!(scsi = ide_scsi_get(disk)))
 696                 return -ENXIO;
 697
 698         return 0;
 699 }
 700
 701 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 702 {
 703         struct gendisk *disk = inode->i_bdev->bd_disk;
 704         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 705
 706         ide_scsi_put(scsi);
 707
 708         return 0;
 709 }
 710
 711 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 712                         unsigned int cmd, unsigned long arg)
 713 {
 714         struct block_device *bdev = inode->i_bdev;
 715         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 716         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 717 }
 718
 719 static struct block_device_operations idescsi_ops = {
 720         .owner          = THIS_MODULE,
 721         .open           = idescsi_ide_open,
 722         .release        = idescsi_ide_release,
 723         .ioctl          = idescsi_ide_ioctl,
 724 };
 725
 726 static int idescsi_slave_configure(struct scsi_device * sdp)
 727 {
 728         /* Configure detected device */
 729         sdp->use_10_for_rw = 1;
 730         sdp->use_10_for_ms = 1;
 731         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 732         return 0;
 733 }
 734
 735 static const char *idescsi_info (struct Scsi_Host *host)
 736 {
 737         return "SCSI host adapter emulation for IDE ATAPI devices";
 738 }
 739
 740 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 741 {
 742         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 743
 744         if (cmd == SG_SET_TRANSFORM) {
 745                 if (arg)
 746                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 747                 else
 748                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 749                 return 0;
 750         } else if (cmd == SG_GET_TRANSFORM)
 751                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 752         return -EINVAL;
 753 }
 754
 755 static int idescsi_queue (struct scsi_cmnd *cmd,
 756                 void (*done)(struct scsi_cmnd *))
 757 {
 758         struct Scsi_Host *host = cmd->device->host;
 759         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 760         ide_drive_t *drive = scsi->drive;
 761         struct request *rq = NULL;
 762         struct ide_atapi_pc *pc = NULL;
 763
 764         if (!drive) {
 765                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 766                 goto abort;
 767         }
 768         scsi = drive_to_idescsi(drive);
 769         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 770         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 771         if (rq == NULL || pc == NULL) {
 772                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 773                 goto abort;
 774         }
 775
 776         memset (pc->c, 0, 12);
 777         pc->flags = 0;
 778         pc->rq = rq;
 779         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 780         pc->buf = NULL;
 781         pc->sg = scsi_sglist(cmd);
 782         pc->sg_cnt = scsi_sg_count(cmd);
 783         pc->b_count = 0;
 784         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 785         pc->scsi_cmd = cmd;
 786         pc->done = done;
 787         pc->timeout = jiffies + cmd->timeout_per_command;
 788
 789         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 790                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 791                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 792                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 793                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 794                         ide_scsi_hex_dump(pc->c, 12);
 795                 }
 796         }
 797
 798         blk_rq_init(NULL, rq);
 799         rq->special = (char *) pc;
 800         rq->cmd_type = REQ_TYPE_SPECIAL;
 801         spin_unlock_irq(host->host_lock);
 802         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 803         spin_lock_irq(host->host_lock);
 804         return 0;
 805 abort:
 806         kfree (pc);
 807         kfree (rq);
 808         cmd->result = DID_ERROR << 16;
 809         done(cmd);
 810         return 0;
 811 }
 812
 813 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 814 {
 815         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 816         ide_drive_t    *drive = scsi->drive;
 817         int             busy;
 818         int             ret   = FAILED;
 819
 820         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 821
 822         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 823                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 824
 825         if (!drive) {
 826                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 827                 WARN_ON(1);
 828                 goto no_drive;
 829         }
 830
 831         /* First give it some more time, how much is "right" is hard to say :-( */
 832
 833         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 834         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 835                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 836
 837         spin_lock_irq(&ide_lock);
 838
 839         /* If there is no pc running we're done (our interrupt took care of it) */
 840         if (!scsi->pc) {
 841                 ret = SUCCESS;
 842                 goto ide_unlock;
 843         }
 844
 845         /* It's somewhere in flight. Does ide subsystem agree? */
 846         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 847             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 848                 /*
 849                  * FIXME - not sure this condition can ever occur
 850                  */
 851                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 852
 853                 if (blk_sense_request(scsi->pc->rq))
 854                         kfree(scsi->pc->buf);
 855                 kfree(scsi->pc->rq);
 856                 kfree(scsi->pc);
 857                 scsi->pc = NULL;
 858
 859                 ret = SUCCESS;
 860         }
 861
 862 ide_unlock:
 863         spin_unlock_irq(&ide_lock);
 864 no_drive:
 865         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 866                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 867
 868         return ret;
 869 }
 870
 871 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 872 {
 873         struct request *req;
 874         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 875         ide_drive_t    *drive = scsi->drive;
 876         int             ready = 0;
 877         int             ret   = SUCCESS;
 878
 879         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 880
 881         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 882                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 883
 884         if (!drive) {
 885                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 886                 WARN_ON(1);
 887                 return FAILED;
 888         }
 889
 890         spin_lock_irq(cmd->device->host->host_lock);
 891         spin_lock(&ide_lock);
 892
 893         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 894                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 895                 spin_unlock(&ide_lock);
 896                 spin_unlock_irq(cmd->device->host->host_lock);
 897                 return FAILED;
 898         }
 899
 900         /* kill current request */
 901         if (__blk_end_request(req, -EIO, 0))
 902                 BUG();
 903         if (blk_sense_request(req))
 904                 kfree(scsi->pc->buf);
 905         kfree(scsi->pc);
 906         scsi->pc = NULL;
 907         kfree(req);
 908
 909         /* now nuke the drive queue */
 910         while ((req = elv_next_request(drive->queue))) {
 911                 if (__blk_end_request(req, -EIO, 0))
 912                         BUG();
 913         }
 914
 915         HWGROUP(drive)->rq = NULL;
 916         HWGROUP(drive)->handler = NULL;
 917         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 918         spin_unlock(&ide_lock);
 919
 920         ide_do_reset(drive);
 921
 922         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 923
 924         do {
 925                 spin_unlock_irq(cmd->device->host->host_lock);
 926                 msleep(50);
 927                 spin_lock_irq(cmd->device->host->host_lock);
 928         } while ( HWGROUP(drive)->handler );
 929
 930         ready = drive_is_ready(drive);
 931         HWGROUP(drive)->busy--;
 932         if (!ready) {
 933                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 934                 ret = FAILED;
 935         }
 936
 937         spin_unlock_irq(cmd->device->host->host_lock);
 938         return ret;
 939 }
 940
 941 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 942                 sector_t capacity, int *parm)
 943 {
 944         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 945         ide_drive_t *drive = idescsi->drive;
 946
 947         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 948                 parm[0] = drive->bios_head;
 949                 parm[1] = drive->bios_sect;
 950                 parm[2] = drive->bios_cyl;
 951         }
 952         return 0;
 953 }
 954
 955 static struct scsi_host_template idescsi_template = {
 956         .module                 = THIS_MODULE,
 957         .name                   = "idescsi",
 958         .info                   = idescsi_info,
 959         .slave_configure        = idescsi_slave_configure,
 960         .ioctl                  = idescsi_ioctl,
 961         .queuecommand           = idescsi_queue,
 962         .eh_abort_handler       = idescsi_eh_abort,
 963         .eh_host_reset_handler  = idescsi_eh_reset,
 964         .bios_param             = idescsi_bios,
 965         .can_queue              = 40,
 966         .this_id                = -1,
 967         .sg_tablesize           = 256,
 968         .cmd_per_lun            = 5,
 969         .max_sectors            = 128,
 970         .use_clustering         = DISABLE_CLUSTERING,
 971         .emulated               = 1,
 972         .proc_name              = "ide-scsi",
 973 };
 974
 975 static int ide_scsi_probe(ide_drive_t *drive)
 976 {
 977         idescsi_scsi_t *idescsi;
 978         struct Scsi_Host *host;
 979         struct gendisk *g;
 980         static int warned;
 981         int err = -ENOMEM;
 982
 983         if (!warned && drive->media == ide_cdrom) {
 984                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 985                 warned = 1;
 986         }
 987
 988         if (idescsi_nocd && drive->media == ide_cdrom)
 989                 return -ENODEV;
 990
 991         if (!strstr("ide-scsi", drive->driver_req) ||
 992             !drive->present ||
 993             drive->media == ide_disk ||
 994             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 995                 return -ENODEV;
 996
 997         g = alloc_disk(1 << PARTN_BITS);
 998         if (!g)
 999                 goto out_host_put;
1000
1001         ide_init_disk(g, drive);
1002
1003         host->max_id = 1;
1004
1005 #if IDESCSI_DEBUG_LOG
1006         if (drive->id->last_lun)
1007                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1008 #endif
1009         if ((drive->id->last_lun & 0x7) != 7)
1010                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1011         else
1012                 host->max_lun = 1;
1013
1014         drive->driver_data = host;
1015         idescsi = scsihost_to_idescsi(host);
1016         idescsi->drive = drive;
1017         idescsi->driver = &idescsi_driver;
1018         idescsi->host = host;
1019         idescsi->disk = g;
1020         g->private_data = &idescsi->driver;
1021         ide_proc_register_driver(drive, &idescsi_driver);
1022         err = 0;
1023         idescsi_setup(drive, idescsi);
1024         g->fops = &idescsi_ops;
1025         ide_register_region(g);
1026         err = scsi_add_host(host, &drive->gendev);
1027         if (!err) {
1028                 scsi_scan_host(host);
1029                 return 0;
1030         }
1031         /* fall through on error */
1032         ide_unregister_region(g);
1033         ide_proc_unregister_driver(drive, &idescsi_driver);
1034
1035         put_disk(g);
1036 out_host_put:
1037         scsi_host_put(host);
1038         return err;
1039 }
1040
1041 static int __init init_idescsi_module(void)
1042 {
1043         return driver_register(&idescsi_driver.gen_driver);
1044 }
1045
1046 static void __exit exit_idescsi_module(void)
1047 {
1048         driver_unregister(&idescsi_driver.gen_driver);
1049 }
1050
1051 module_param(idescsi_nocd, int, 0600);
1052 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1053 module_init(init_idescsi_module);
1054 module_exit(exit_idescsi_module);
1055 MODULE_LICENSE("GPL");