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   1 /*
   2  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   3  * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   8  *
   9  * With this driver, one can use the Linux SCSI drivers instead of the
  10  * native IDE ATAPI drivers.
  11  *
  12  * Ver 0.1   Dec  3 96   Initial version.
  13  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  14  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  15  *                        to Janos Farkas for pointing this out.
  16  *                       Avoid using bitfields in structures for m68k.
  17  *                       Added Scatter/Gather and DMA support.
  18  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  19  *                       Use variable timeout for each command.
  20  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  21  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  22  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  23  *                        for access through /dev/sg.
  24  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  25  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  26  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  27  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  28  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  29  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  30  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  31  */
  32
  33 #define IDESCSI_VERSION "0.92"
  34
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/string.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/ioport.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/errno.h>
  43 #include <linux/hdreg.h>
  44 #include <linux/slab.h>
  45 #include <linux/ide.h>
  46 #include <linux/scatterlist.h>
  47 #include <linux/delay.h>
  48 #include <linux/mutex.h>
  49 #include <linux/bitops.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/uaccess.h>
  53
  54 #include <scsi/scsi.h>
  55 #include <scsi/scsi_cmnd.h>
  56 #include <scsi/scsi_device.h>
  57 #include <scsi/scsi_host.h>
  58 #include <scsi/scsi_tcq.h>
  59 #include <scsi/sg.h>
  60
  61 #define IDESCSI_DEBUG_LOG               0
  62
  63 #if IDESCSI_DEBUG_LOG
  64 #define debug_log(fmt, args...) \
  65         printk(KERN_INFO "ide-scsi: " fmt, ## args)
  66 #else
  67 #define debug_log(fmt, args...) do {} while (0)
  68 #endif
  69
  70 /*
  71  *      SCSI command transformation layer
  72  */
  73 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  74
  75 /*
  76  *      Log flags
  77  */
  78 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  79
  80 typedef struct ide_scsi_obj {
  81         ide_drive_t             *drive;
  82         ide_driver_t            *driver;
  83         struct gendisk          *disk;
  84         struct Scsi_Host        *host;
  85
  86         struct ide_atapi_pc *pc;                /* Current packet command */
  87         unsigned long flags;                    /* Status/Action flags */
  88         unsigned long transform;                /* SCSI cmd translation layer */
  89         unsigned long log;                      /* log flags */
  90 } idescsi_scsi_t;
  91
  92 static DEFINE_MUTEX(idescsi_ref_mutex);
  93 /* Set by module param to skip cd */
  94 static int idescsi_nocd;
  95
  96 #define ide_scsi_g(disk) \
  97         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  98
  99 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 100 {
 101         struct ide_scsi_obj *scsi = NULL;
 102
 103         mutex_lock(&idescsi_ref_mutex);
 104         scsi = ide_scsi_g(disk);
 105         if (scsi)
 106                 scsi_host_get(scsi->host);
 107         mutex_unlock(&idescsi_ref_mutex);
 108         return scsi;
 109 }
 110
 111 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 112 {
 113         mutex_lock(&idescsi_ref_mutex);
 114         scsi_host_put(scsi->host);
 115         mutex_unlock(&idescsi_ref_mutex);
 116 }
 117
 118 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 119 {
 120         return (idescsi_scsi_t*) (&host[1]);
 121 }
 122
 123 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 124 {
 125         return scsihost_to_idescsi(ide_drive->driver_data);
 126 }
 127
 128 /*
 129  *      Per ATAPI device status bits.
 130  */
 131 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 132
 133 /*
 134  *      ide-scsi requests.
 135  */
 136 #define IDESCSI_PC_RQ                   90
 137
 138 /*
 139  *      PIO data transfer routine using the scatter gather table.
 140  */
 141 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 142                                 unsigned int bcount, int write)
 143 {
 144         ide_hwif_t *hwif = drive->hwif;
 145         xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
 146         char *buf;
 147         int count;
 148
 149         while (bcount) {
 150                 count = min(pc->sg->length - pc->b_count, bcount);
 151                 if (PageHighMem(sg_page(pc->sg))) {
 152                         unsigned long flags;
 153
 154                         local_irq_save(flags);
 155                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 156                                           pc->sg->offset;
 157                         xf(drive, NULL, buf + pc->b_count, count);
 158                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 159                         local_irq_restore(flags);
 160                 } else {
 161                         buf = sg_virt(pc->sg);
 162                         xf(drive, NULL, buf + pc->b_count, count);
 163                 }
 164                 bcount -= count; pc->b_count += count;
 165                 if (pc->b_count == pc->sg->length) {
 166                         if (!--pc->sg_cnt)
 167                                 break;
 168                         pc->sg = sg_next(pc->sg);
 169                         pc->b_count = 0;
 170                 }
 171         }
 172
 173         if (bcount) {
 174                 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
 175                                 drive->name, write ? "padding with zeros"
 176                                                    : "discarding data");
 177                 ide_pad_transfer(drive, write, bcount);
 178         }
 179 }
 180
 181 static void ide_scsi_hex_dump(u8 *data, int len)
 182 {
 183         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 184 }
 185
 186 static int idescsi_check_condition(ide_drive_t *drive,
 187                 struct request *failed_cmd)
 188 {
 189         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 190         struct ide_atapi_pc   *pc;
 191         struct request *rq;
 192         u8             *buf;
 193
 194         /* stuff a sense request in front of our current request */
 195         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 196         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 197         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 198         if (!pc || !rq || !buf) {
 199                 kfree(buf);
 200                 kfree(rq);
 201                 kfree(pc);
 202                 return -ENOMEM;
 203         }
 204         blk_rq_init(NULL, rq);
 205         rq->special = (char *) pc;
 206         pc->rq = rq;
 207         pc->buf = buf;
 208         pc->c[0] = REQUEST_SENSE;
 209         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 210         rq->cmd_type = REQ_TYPE_SENSE;
 211         rq->cmd_flags |= REQ_PREEMPT;
 212         pc->timeout = jiffies + WAIT_READY;
 213         /* NOTE! Save the failed packet command in "rq->buffer" */
 214         rq->buffer = (void *) failed_cmd->special;
 215         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 216         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 217                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 218                 ide_scsi_hex_dump(pc->c, 6);
 219         }
 220         rq->rq_disk = scsi->disk;
 221         ide_do_drive_cmd(drive, rq);
 222         return 0;
 223 }
 224
 225 static int idescsi_end_request(ide_drive_t *, int, int);
 226
 227 static ide_startstop_t
 228 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 229 {
 230         ide_hwif_t *hwif = drive->hwif;
 231
 232         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 233                 /* force an abort */
 234                 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
 235                                hwif->io_ports.command_addr);
 236
 237         rq->errors++;
 238
 239         idescsi_end_request(drive, 0, 0);
 240
 241         return ide_stopped;
 242 }
 243
 244 static ide_startstop_t
 245 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 246 {
 247         debug_log("%s called for %lu\n", __func__,
 248                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 249
 250         rq->errors |= ERROR_MAX;
 251
 252         idescsi_end_request(drive, 0, 0);
 253
 254         return ide_stopped;
 255 }
 256
 257 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 258 {
 259         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 260         struct request *rq = HWGROUP(drive)->rq;
 261         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 262         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 263         struct Scsi_Host *host;
 264         int errors = rq->errors;
 265         unsigned long flags;
 266
 267         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 268                 ide_end_request(drive, uptodate, nrsecs);
 269                 return 0;
 270         }
 271         ide_end_drive_cmd (drive, 0, 0);
 272         if (blk_sense_request(rq)) {
 273                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 274                 if (log) {
 275                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 276                         ide_scsi_hex_dump(pc->buf, 16);
 277                 }
 278                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 279                         SCSI_SENSE_BUFFERSIZE);
 280                 kfree(pc->buf);
 281                 kfree(pc);
 282                 kfree(rq);
 283                 pc = opc;
 284                 rq = pc->rq;
 285                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 286                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 287                                   DID_TIME_OUT :
 288                                   DID_OK) << 16);
 289         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 290                 if (log)
 291                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 292                                         drive->name, pc->scsi_cmd->serial_number);
 293                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 294         } else if (errors >= ERROR_MAX) {
 295                 pc->scsi_cmd->result = DID_ERROR << 16;
 296                 if (log)
 297                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 298         } else if (errors) {
 299                 if (log)
 300                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 301                 if (!idescsi_check_condition(drive, rq))
 302                         /* we started a request sense, so we'll be back, exit for now */
 303                         return 0;
 304                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 305         } else {
 306                 pc->scsi_cmd->result = DID_OK << 16;
 307         }
 308         host = pc->scsi_cmd->device->host;
 309         spin_lock_irqsave(host->host_lock, flags);
 310         pc->done(pc->scsi_cmd);
 311         spin_unlock_irqrestore(host->host_lock, flags);
 312         kfree(pc);
 313         kfree(rq);
 314         scsi->pc = NULL;
 315         return 0;
 316 }
 317
 318 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 319 {
 320         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 321 }
 322
 323 static int idescsi_expiry(ide_drive_t *drive)
 324 {
 325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 326         struct ide_atapi_pc   *pc   = scsi->pc;
 327
 328         debug_log("%s called for %lu at %lu\n", __func__,
 329                   pc->scsi_cmd->serial_number, jiffies);
 330
 331         pc->flags |= PC_FLAG_TIMEDOUT;
 332
 333         return 0;                                       /* we do not want the ide subsystem to retry */
 334 }
 335
 336 /*
 337  *      Our interrupt handler.
 338  */
 339 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 340 {
 341         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 342         ide_hwif_t *hwif = drive->hwif;
 343         struct ide_atapi_pc *pc = scsi->pc;
 344         struct request *rq = pc->rq;
 345         xfer_func_t *xferfunc;
 346         unsigned int temp;
 347         u16 bcount;
 348         u8 stat, ireason;
 349
 350         debug_log("Reached %s interrupt handler\n", __func__);
 351
 352         if (pc->flags & PC_FLAG_TIMEDOUT) {
 353                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 354                           pc->scsi_cmd->serial_number, jiffies);
 355                 /* end this request now - scsi should retry it*/
 356                 idescsi_end_request (drive, 1, 0);
 357                 return ide_stopped;
 358         }
 359         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 360                 if (hwif->dma_ops->dma_end(drive))
 361                         pc->flags |= PC_FLAG_DMA_ERROR;
 362                 else
 363                         pc->xferred = pc->req_xfer;
 364                 debug_log("%s: DMA finished\n", drive->name);
 365         }
 366
 367         /* Clear the interrupt */
 368         stat = ide_read_status(drive);
 369
 370         if ((stat & DRQ_STAT) == 0) {
 371                 /* No more interrupts */
 372                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 373                         printk(KERN_INFO "Packet command completed, %d bytes"
 374                                         " transferred\n", pc->xferred);
 375                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 376                 local_irq_enable_in_hardirq();
 377                 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
 378                         rq->errors++;
 379                 idescsi_end_request (drive, 1, 0);
 380                 return ide_stopped;
 381         }
 382         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 383                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 384                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 385                                 "in DMA mode\n", drive->name);
 386                 ide_dma_off(drive);
 387                 return ide_do_reset(drive);
 388         }
 389         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 390                   hwif->INB(hwif->io_ports.lbam_addr);
 391         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 392
 393         if (ireason & CD) {
 394                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 395                 return ide_do_reset (drive);
 396         }
 397         if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
 398                 /* Hopefully, we will never get here */
 399                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 400                                 "to %s!\n", drive->name,
 401                                 (ireason & IO) ? "Write" : "Read",
 402                                 (ireason & IO) ? "Read" : "Write");
 403                 return ide_do_reset(drive);
 404         }
 405         if (!(pc->flags & PC_FLAG_WRITING)) {
 406                 temp = pc->xferred + bcount;
 407                 if (temp > pc->req_xfer) {
 408                         if (temp > pc->buf_size) {
 409                                 printk(KERN_ERR "%s: The device wants to send "
 410                                                 "us more data than expected - "
 411                                                 "discarding data\n",
 412                                                 drive->name);
 413                                 temp = pc->buf_size - pc->xferred;
 414                                 if (temp) {
 415                                         if (pc->sg)
 416                                                 ide_scsi_io_buffers(drive, pc,
 417                                                                     temp, 0);
 418                                         else
 419                                                 hwif->input_data(drive, NULL,
 420                                                         pc->cur_pos, temp);
 421                                         printk(KERN_ERR "%s: transferred %d of "
 422                                                         "%d bytes\n",
 423                                                         drive->name,
 424                                                         temp, bcount);
 425                                 }
 426                                 pc->xferred += temp;
 427                                 pc->cur_pos += temp;
 428                                 ide_pad_transfer(drive, 0, bcount - temp);
 429                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 430                                 return ide_started;
 431                         }
 432                         debug_log("The device wants to send us more data than "
 433                                   "expected - allowing transfer\n");
 434                 }
 435                 xferfunc = hwif->input_data;
 436         } else
 437                 xferfunc = hwif->output_data;
 438
 439         if (pc->sg)
 440                 ide_scsi_io_buffers(drive, pc, bcount,
 441                                     !!(pc->flags & PC_FLAG_WRITING));
 442         else
 443                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 444
 445         /* Update the current position */
 446         pc->xferred += bcount;
 447         pc->cur_pos += bcount;
 448
 449         /* And set the interrupt handler again */
 450         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 451         return ide_started;
 452 }
 453
 454 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 455 {
 456         ide_hwif_t *hwif = drive->hwif;
 457         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 458         struct ide_atapi_pc *pc = scsi->pc;
 459         ide_startstop_t startstop;
 460         u8 ireason;
 461
 462         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 463                 printk(KERN_ERR "%s: Strange, packet command initiated yet "
 464                                 "DRQ isn't asserted\n", drive->name);
 465                 return startstop;
 466         }
 467         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 468         if ((ireason & CD) == 0 || (ireason & IO)) {
 469                 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
 470                                 "a packet command\n", drive->name);
 471                 return ide_do_reset (drive);
 472         }
 473
 474         /* Set the interrupt routine */
 475         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 476
 477         if (pc->flags & PC_FLAG_DMA_OK) {
 478                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 479                 hwif->dma_ops->dma_start(drive);
 480         }
 481
 482         /* Send the actual packet */
 483         hwif->output_data(drive, NULL, scsi->pc->c, 12);
 484
 485         return ide_started;
 486 }
 487
 488 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 489 {
 490         switch (pc->c[0]) {
 491                 case READ_6: case READ_10: case READ_12:
 492                         pc->flags &= ~PC_FLAG_WRITING;
 493                         return 0;
 494                 case WRITE_6: case WRITE_10: case WRITE_12:
 495                         pc->flags |= PC_FLAG_WRITING;
 496                         return 0;
 497                 default:
 498                         return 1;
 499         }
 500 }
 501
 502 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 503 {
 504         ide_hwif_t *hwif = drive->hwif;
 505         struct scatterlist *sg, *scsi_sg;
 506         int segments;
 507
 508         if (!pc->req_xfer || pc->req_xfer % 1024)
 509                 return 1;
 510
 511         if (idescsi_set_direction(pc))
 512                 return 1;
 513
 514         sg = hwif->sg_table;
 515         scsi_sg = scsi_sglist(pc->scsi_cmd);
 516         segments = scsi_sg_count(pc->scsi_cmd);
 517
 518         if (segments > hwif->sg_max_nents)
 519                 return 1;
 520
 521         hwif->sg_nents = segments;
 522         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 523
 524         return 0;
 525 }
 526
 527 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 528                 struct ide_atapi_pc *pc)
 529 {
 530         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 531         ide_hwif_t *hwif = drive->hwif;
 532         u16 bcount;
 533         u8 dma = 0;
 534
 535         /* Set the current packet command */
 536         scsi->pc = pc;
 537         /* We haven't transferred any data yet */
 538         pc->xferred = 0;
 539         pc->cur_pos = pc->buf;
 540         /* Request to transfer the entire buffer at once */
 541         bcount = min(pc->req_xfer, 63 * 1024);
 542
 543         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 544                 hwif->sg_mapped = 1;
 545                 dma = !hwif->dma_ops->dma_setup(drive);
 546                 hwif->sg_mapped = 0;
 547         }
 548
 549         ide_pktcmd_tf_load(drive, 0, bcount, dma);
 550
 551         if (dma)
 552                 pc->flags |= PC_FLAG_DMA_OK;
 553
 554         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 555                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
 556                                     get_timeout(pc), idescsi_expiry);
 557                 return ide_started;
 558         } else {
 559                 /* Issue the packet command */
 560                 ide_execute_pkt_cmd(drive);
 561                 return idescsi_transfer_pc(drive);
 562         }
 563 }
 564
 565 /*
 566  *      idescsi_do_request is our request handling function.
 567  */
 568 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 569 {
 570         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 571                   rq->cmd[0], rq->errors);
 572         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 573                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 574
 575         if (blk_sense_request(rq) || blk_special_request(rq)) {
 576                 return idescsi_issue_pc(drive,
 577                                 (struct ide_atapi_pc *) rq->special);
 578         }
 579         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 580         idescsi_end_request (drive, 0, 0);
 581         return ide_stopped;
 582 }
 583
 584 #ifdef CONFIG_IDE_PROC_FS
 585 static void idescsi_add_settings(ide_drive_t *drive)
 586 {
 587         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 588
 589 /*
 590  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 591  */
 592         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 593         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 594         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 595         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 596         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 597 }
 598 #else
 599 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 600 #endif
 601
 602 /*
 603  *      Driver initialization.
 604  */
 605 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 606 {
 607         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 608                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 609         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 610 #if IDESCSI_DEBUG_LOG
 611         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 612 #endif /* IDESCSI_DEBUG_LOG */
 613         idescsi_add_settings(drive);
 614 }
 615
 616 static void ide_scsi_remove(ide_drive_t *drive)
 617 {
 618         struct Scsi_Host *scsihost = drive->driver_data;
 619         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 620         struct gendisk *g = scsi->disk;
 621
 622         scsi_remove_host(scsihost);
 623         ide_proc_unregister_driver(drive, scsi->driver);
 624
 625         ide_unregister_region(g);
 626
 627         drive->driver_data = NULL;
 628         g->private_data = NULL;
 629         put_disk(g);
 630
 631         ide_scsi_put(scsi);
 632 }
 633
 634 static int ide_scsi_probe(ide_drive_t *);
 635
 636 #ifdef CONFIG_IDE_PROC_FS
 637 static ide_proc_entry_t idescsi_proc[] = {
 638         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 639         { NULL, 0, NULL, NULL }
 640 };
 641 #endif
 642
 643 static ide_driver_t idescsi_driver = {
 644         .gen_driver = {
 645                 .owner          = THIS_MODULE,
 646                 .name           = "ide-scsi",
 647                 .bus            = &ide_bus_type,
 648         },
 649         .probe                  = ide_scsi_probe,
 650         .remove                 = ide_scsi_remove,
 651         .version                = IDESCSI_VERSION,
 652         .media                  = ide_scsi,
 653         .supports_dsc_overlap   = 0,
 654         .do_request             = idescsi_do_request,
 655         .end_request            = idescsi_end_request,
 656         .error                  = idescsi_atapi_error,
 657         .abort                  = idescsi_atapi_abort,
 658 #ifdef CONFIG_IDE_PROC_FS
 659         .proc                   = idescsi_proc,
 660 #endif
 661 };
 662
 663 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 664 {
 665         struct gendisk *disk = inode->i_bdev->bd_disk;
 666         struct ide_scsi_obj *scsi;
 667
 668         if (!(scsi = ide_scsi_get(disk)))
 669                 return -ENXIO;
 670
 671         return 0;
 672 }
 673
 674 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 675 {
 676         struct gendisk *disk = inode->i_bdev->bd_disk;
 677         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 678
 679         ide_scsi_put(scsi);
 680
 681         return 0;
 682 }
 683
 684 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 685                         unsigned int cmd, unsigned long arg)
 686 {
 687         struct block_device *bdev = inode->i_bdev;
 688         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 689         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 690 }
 691
 692 static struct block_device_operations idescsi_ops = {
 693         .owner          = THIS_MODULE,
 694         .open           = idescsi_ide_open,
 695         .release        = idescsi_ide_release,
 696         .ioctl          = idescsi_ide_ioctl,
 697 };
 698
 699 static int idescsi_slave_configure(struct scsi_device * sdp)
 700 {
 701         /* Configure detected device */
 702         sdp->use_10_for_rw = 1;
 703         sdp->use_10_for_ms = 1;
 704         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 705         return 0;
 706 }
 707
 708 static const char *idescsi_info (struct Scsi_Host *host)
 709 {
 710         return "SCSI host adapter emulation for IDE ATAPI devices";
 711 }
 712
 713 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 714 {
 715         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 716
 717         if (cmd == SG_SET_TRANSFORM) {
 718                 if (arg)
 719                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 720                 else
 721                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 722                 return 0;
 723         } else if (cmd == SG_GET_TRANSFORM)
 724                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 725         return -EINVAL;
 726 }
 727
 728 static int idescsi_queue (struct scsi_cmnd *cmd,
 729                 void (*done)(struct scsi_cmnd *))
 730 {
 731         struct Scsi_Host *host = cmd->device->host;
 732         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 733         ide_drive_t *drive = scsi->drive;
 734         struct request *rq = NULL;
 735         struct ide_atapi_pc *pc = NULL;
 736
 737         if (!drive) {
 738                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 739                 goto abort;
 740         }
 741         scsi = drive_to_idescsi(drive);
 742         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 743         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 744         if (rq == NULL || pc == NULL) {
 745                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 746                 goto abort;
 747         }
 748
 749         memset (pc->c, 0, 12);
 750         pc->flags = 0;
 751         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 752                 pc->flags |= PC_FLAG_WRITING;
 753         pc->rq = rq;
 754         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 755         pc->buf = NULL;
 756         pc->sg = scsi_sglist(cmd);
 757         pc->sg_cnt = scsi_sg_count(cmd);
 758         pc->b_count = 0;
 759         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 760         pc->scsi_cmd = cmd;
 761         pc->done = done;
 762         pc->timeout = jiffies + cmd->timeout_per_command;
 763
 764         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 765                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 766                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 767                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 768                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 769                         ide_scsi_hex_dump(pc->c, 12);
 770                 }
 771         }
 772
 773         blk_rq_init(NULL, rq);
 774         rq->special = (char *) pc;
 775         rq->cmd_type = REQ_TYPE_SPECIAL;
 776         spin_unlock_irq(host->host_lock);
 777         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 778         spin_lock_irq(host->host_lock);
 779         return 0;
 780 abort:
 781         kfree (pc);
 782         kfree (rq);
 783         cmd->result = DID_ERROR << 16;
 784         done(cmd);
 785         return 0;
 786 }
 787
 788 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 789 {
 790         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 791         ide_drive_t    *drive = scsi->drive;
 792         int             busy;
 793         int             ret   = FAILED;
 794
 795         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 796
 797         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 798                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 799
 800         if (!drive) {
 801                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 802                 WARN_ON(1);
 803                 goto no_drive;
 804         }
 805
 806         /* First give it some more time, how much is "right" is hard to say :-( */
 807
 808         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 809         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 810                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 811
 812         spin_lock_irq(&ide_lock);
 813
 814         /* If there is no pc running we're done (our interrupt took care of it) */
 815         if (!scsi->pc) {
 816                 ret = SUCCESS;
 817                 goto ide_unlock;
 818         }
 819
 820         /* It's somewhere in flight. Does ide subsystem agree? */
 821         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 822             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 823                 /*
 824                  * FIXME - not sure this condition can ever occur
 825                  */
 826                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 827
 828                 if (blk_sense_request(scsi->pc->rq))
 829                         kfree(scsi->pc->buf);
 830                 kfree(scsi->pc->rq);
 831                 kfree(scsi->pc);
 832                 scsi->pc = NULL;
 833
 834                 ret = SUCCESS;
 835         }
 836
 837 ide_unlock:
 838         spin_unlock_irq(&ide_lock);
 839 no_drive:
 840         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 841                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 842
 843         return ret;
 844 }
 845
 846 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 847 {
 848         struct request *req;
 849         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 850         ide_drive_t    *drive = scsi->drive;
 851         int             ready = 0;
 852         int             ret   = SUCCESS;
 853
 854         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 855
 856         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 857                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 858
 859         if (!drive) {
 860                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 861                 WARN_ON(1);
 862                 return FAILED;
 863         }
 864
 865         spin_lock_irq(cmd->device->host->host_lock);
 866         spin_lock(&ide_lock);
 867
 868         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 869                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 870                 spin_unlock(&ide_lock);
 871                 spin_unlock_irq(cmd->device->host->host_lock);
 872                 return FAILED;
 873         }
 874
 875         /* kill current request */
 876         if (__blk_end_request(req, -EIO, 0))
 877                 BUG();
 878         if (blk_sense_request(req))
 879                 kfree(scsi->pc->buf);
 880         kfree(scsi->pc);
 881         scsi->pc = NULL;
 882         kfree(req);
 883
 884         /* now nuke the drive queue */
 885         while ((req = elv_next_request(drive->queue))) {
 886                 if (__blk_end_request(req, -EIO, 0))
 887                         BUG();
 888         }
 889
 890         HWGROUP(drive)->rq = NULL;
 891         HWGROUP(drive)->handler = NULL;
 892         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 893         spin_unlock(&ide_lock);
 894
 895         ide_do_reset(drive);
 896
 897         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 898
 899         do {
 900                 spin_unlock_irq(cmd->device->host->host_lock);
 901                 msleep(50);
 902                 spin_lock_irq(cmd->device->host->host_lock);
 903         } while ( HWGROUP(drive)->handler );
 904
 905         ready = drive_is_ready(drive);
 906         HWGROUP(drive)->busy--;
 907         if (!ready) {
 908                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 909                 ret = FAILED;
 910         }
 911
 912         spin_unlock_irq(cmd->device->host->host_lock);
 913         return ret;
 914 }
 915
 916 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 917                 sector_t capacity, int *parm)
 918 {
 919         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 920         ide_drive_t *drive = idescsi->drive;
 921
 922         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 923                 parm[0] = drive->bios_head;
 924                 parm[1] = drive->bios_sect;
 925                 parm[2] = drive->bios_cyl;
 926         }
 927         return 0;
 928 }
 929
 930 static struct scsi_host_template idescsi_template = {
 931         .module                 = THIS_MODULE,
 932         .name                   = "idescsi",
 933         .info                   = idescsi_info,
 934         .slave_configure        = idescsi_slave_configure,
 935         .ioctl                  = idescsi_ioctl,
 936         .queuecommand           = idescsi_queue,
 937         .eh_abort_handler       = idescsi_eh_abort,
 938         .eh_host_reset_handler  = idescsi_eh_reset,
 939         .bios_param             = idescsi_bios,
 940         .can_queue              = 40,
 941         .this_id                = -1,
 942         .sg_tablesize           = 256,
 943         .cmd_per_lun            = 5,
 944         .max_sectors            = 128,
 945         .use_clustering         = DISABLE_CLUSTERING,
 946         .emulated               = 1,
 947         .proc_name              = "ide-scsi",
 948 };
 949
 950 static int ide_scsi_probe(ide_drive_t *drive)
 951 {
 952         idescsi_scsi_t *idescsi;
 953         struct Scsi_Host *host;
 954         struct gendisk *g;
 955         static int warned;
 956         int err = -ENOMEM;
 957
 958         if (!warned && drive->media == ide_cdrom) {
 959                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 960                 warned = 1;
 961         }
 962
 963         if (idescsi_nocd && drive->media == ide_cdrom)
 964                 return -ENODEV;
 965
 966         if (!strstr("ide-scsi", drive->driver_req) ||
 967             !drive->present ||
 968             drive->media == ide_disk ||
 969             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 970                 return -ENODEV;
 971
 972         g = alloc_disk(1 << PARTN_BITS);
 973         if (!g)
 974                 goto out_host_put;
 975
 976         ide_init_disk(g, drive);
 977
 978         host->max_id = 1;
 979
 980         if (drive->id->last_lun)
 981                 debug_log("%s: id->last_lun=%u\n", drive->name,
 982                           drive->id->last_lun);
 983
 984         if ((drive->id->last_lun & 0x7) != 7)
 985                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 986         else
 987                 host->max_lun = 1;
 988
 989         drive->driver_data = host;
 990         idescsi = scsihost_to_idescsi(host);
 991         idescsi->drive = drive;
 992         idescsi->driver = &idescsi_driver;
 993         idescsi->host = host;
 994         idescsi->disk = g;
 995         g->private_data = &idescsi->driver;
 996         ide_proc_register_driver(drive, &idescsi_driver);
 997         err = 0;
 998         idescsi_setup(drive, idescsi);
 999         g->fops = &idescsi_ops;
1000         ide_register_region(g);
1001         err = scsi_add_host(host, &drive->gendev);
1002         if (!err) {
1003                 scsi_scan_host(host);
1004                 return 0;
1005         }
1006         /* fall through on error */
1007         ide_unregister_region(g);
1008         ide_proc_unregister_driver(drive, &idescsi_driver);
1009
1010         put_disk(g);
1011 out_host_put:
1012         scsi_host_put(host);
1013         return err;
1014 }
1015
1016 static int __init init_idescsi_module(void)
1017 {
1018         return driver_register(&idescsi_driver.gen_driver);
1019 }
1020
1021 static void __exit exit_idescsi_module(void)
1022 {
1023         driver_unregister(&idescsi_driver.gen_driver);
1024 }
1025
1026 module_param(idescsi_nocd, int, 0600);
1027 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1028 module_init(init_idescsi_module);
1029 module_exit(exit_idescsi_module);
1030 MODULE_LICENSE("GPL");