SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/ide-scsi.c

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