hw/scsi-bus.c

   1 #include "hw.h"
   2 #include "qemu-error.h"
   3 #include "scsi.h"
   4 #include "scsi-defs.h"
   5 #include "qdev.h"
   6 #include "blockdev.h"
   7 #include "trace.h"
   8
   9 static char *scsibus_get_fw_dev_path(DeviceState *dev);
  10
  11 static struct BusInfo scsi_bus_info = {
  12     .name  = "SCSI",
  13     .size  = sizeof(SCSIBus),
  14     .get_fw_dev_path = scsibus_get_fw_dev_path,
  15     .props = (Property[]) {
  16         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  17         DEFINE_PROP_END_OF_LIST(),
  18     },
  19 };
  20 static int next_scsi_bus;
  21
  22 /* Create a scsi bus, and attach devices to it.  */
  23 void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
  24                   const SCSIBusOps *ops)
  25 {
  26     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
  27     bus->busnr = next_scsi_bus++;
  28     bus->tcq = tcq;
  29     bus->ndev = ndev;
  30     bus->ops = ops;
  31     bus->qbus.allow_hotplug = 1;
  32 }
  33
  34 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  35 {
  36     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  37     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  38     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  39     int rc = -1;
  40
  41     if (dev->id == -1) {
  42         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  43             if (bus->devs[dev->id] == NULL)
  44                 break;
  45         }
  46     }
  47     if (dev->id >= bus->ndev) {
  48         error_report("bad scsi device id: %d", dev->id);
  49         goto err;
  50     }
  51
  52     if (bus->devs[dev->id]) {
  53         qdev_free(&bus->devs[dev->id]->qdev);
  54     }
  55     bus->devs[dev->id] = dev;
  56
  57     dev->info = info;
  58     QTAILQ_INIT(&dev->requests);
  59     rc = dev->info->init(dev);
  60     if (rc != 0) {
  61         bus->devs[dev->id] = NULL;
  62     }
  63
  64 err:
  65     return rc;
  66 }
  67
  68 static int scsi_qdev_exit(DeviceState *qdev)
  69 {
  70     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  71     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  72
  73     assert(bus->devs[dev->id] != NULL);
  74     if (bus->devs[dev->id]->info->destroy) {
  75         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  76     }
  77     bus->devs[dev->id] = NULL;
  78     return 0;
  79 }
  80
  81 void scsi_qdev_register(SCSIDeviceInfo *info)
  82 {
  83     info->qdev.bus_info = &scsi_bus_info;
  84     info->qdev.init     = scsi_qdev_init;
  85     info->qdev.unplug   = qdev_simple_unplug_cb;
  86     info->qdev.exit     = scsi_qdev_exit;
  87     qdev_register(&info->qdev);
  88 }
  89
  90 /* handle legacy '-drive if=scsi,...' cmd line args */
  91 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
  92                                       int unit, bool removable)
  93 {
  94     const char *driver;
  95     DeviceState *dev;
  96
  97     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
  98     dev = qdev_create(&bus->qbus, driver);
  99     qdev_prop_set_uint32(dev, "scsi-id", unit);
 100     if (qdev_prop_exists(dev, "removable")) {
 101         qdev_prop_set_bit(dev, "removable", removable);
 102     }
 103     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
 104         qdev_free(dev);
 105         return NULL;
 106     }
 107     if (qdev_init(dev) < 0)
 108         return NULL;
 109     return DO_UPCAST(SCSIDevice, qdev, dev);
 110 }
 111
 112 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 113 {
 114     Location loc;
 115     DriveInfo *dinfo;
 116     int res = 0, unit;
 117
 118     loc_push_none(&loc);
 119     for (unit = 0; unit < bus->ndev; unit++) {
 120         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 121         if (dinfo == NULL) {
 122             continue;
 123         }
 124         qemu_opts_loc_restore(dinfo->opts);
 125         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit, false)) {
 126             res = -1;
 127             break;
 128         }
 129     }
 130     loc_pop(&loc);
 131     return res;
 132 }
 133
 134 SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag, uint32_t lun)
 135 {
 136     SCSIRequest *req;
 137
 138     req = qemu_mallocz(size);
 139     req->refcount = 1;
 140     req->bus = scsi_bus_from_device(d);
 141     req->dev = d;
 142     req->tag = tag;
 143     req->lun = lun;
 144     req->status = -1;
 145     trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
 146     return req;
 147 }
 148
 149 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun)
 150 {
 151     return d->info->alloc_req(d, tag, lun);
 152 }
 153
 154 int32_t scsi_req_enqueue(SCSIRequest *req, uint8_t *buf)
 155 {
 156     int32_t rc;
 157
 158     assert(!req->enqueued);
 159     scsi_req_ref(req);
 160     req->enqueued = true;
 161     QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
 162
 163     scsi_req_ref(req);
 164     rc = req->dev->info->send_command(req, buf);
 165     scsi_req_unref(req);
 166     return rc;
 167 }
 168
 169 static void scsi_req_dequeue(SCSIRequest *req)
 170 {
 171     trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
 172     if (req->enqueued) {
 173         QTAILQ_REMOVE(&req->dev->requests, req, next);
 174         req->enqueued = false;
 175         scsi_req_unref(req);
 176     }
 177 }
 178
 179 static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
 180 {
 181     switch (cmd[0] >> 5) {
 182     case 0:
 183         req->cmd.xfer = cmd[4];
 184         req->cmd.len = 6;
 185         /* length 0 means 256 blocks */
 186         if (req->cmd.xfer == 0)
 187             req->cmd.xfer = 256;
 188         break;
 189     case 1:
 190     case 2:
 191         req->cmd.xfer = cmd[8] | (cmd[7] << 8);
 192         req->cmd.len = 10;
 193         break;
 194     case 4:
 195         req->cmd.xfer = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
 196         req->cmd.len = 16;
 197         break;
 198     case 5:
 199         req->cmd.xfer = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
 200         req->cmd.len = 12;
 201         break;
 202     default:
 203         trace_scsi_req_parse_bad(req->dev->id, req->lun, req->tag, cmd[0]);
 204         return -1;
 205     }
 206
 207     switch(cmd[0]) {
 208     case TEST_UNIT_READY:
 209     case REZERO_UNIT:
 210     case START_STOP:
 211     case SEEK_6:
 212     case WRITE_FILEMARKS:
 213     case SPACE:
 214     case RESERVE:
 215     case RELEASE:
 216     case ERASE:
 217     case ALLOW_MEDIUM_REMOVAL:
 218     case VERIFY:
 219     case SEEK_10:
 220     case SYNCHRONIZE_CACHE:
 221     case LOCK_UNLOCK_CACHE:
 222     case LOAD_UNLOAD:
 223     case SET_CD_SPEED:
 224     case SET_LIMITS:
 225     case WRITE_LONG:
 226     case MOVE_MEDIUM:
 227     case UPDATE_BLOCK:
 228         req->cmd.xfer = 0;
 229         break;
 230     case MODE_SENSE:
 231         break;
 232     case WRITE_SAME:
 233         req->cmd.xfer = 1;
 234         break;
 235     case READ_CAPACITY:
 236         req->cmd.xfer = 8;
 237         break;
 238     case READ_BLOCK_LIMITS:
 239         req->cmd.xfer = 6;
 240         break;
 241     case READ_POSITION:
 242         req->cmd.xfer = 20;
 243         break;
 244     case SEND_VOLUME_TAG:
 245         req->cmd.xfer *= 40;
 246         break;
 247     case MEDIUM_SCAN:
 248         req->cmd.xfer *= 8;
 249         break;
 250     case WRITE_10:
 251     case WRITE_VERIFY:
 252     case WRITE_6:
 253     case WRITE_12:
 254     case WRITE_VERIFY_12:
 255     case WRITE_16:
 256     case WRITE_VERIFY_16:
 257         req->cmd.xfer *= req->dev->blocksize;
 258         break;
 259     case READ_10:
 260     case READ_6:
 261     case READ_REVERSE:
 262     case RECOVER_BUFFERED_DATA:
 263     case READ_12:
 264     case READ_16:
 265         req->cmd.xfer *= req->dev->blocksize;
 266         break;
 267     case INQUIRY:
 268         req->cmd.xfer = cmd[4] | (cmd[3] << 8);
 269         break;
 270     case MAINTENANCE_OUT:
 271     case MAINTENANCE_IN:
 272         if (req->dev->type == TYPE_ROM) {
 273             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 274             req->cmd.xfer = cmd[9] | (cmd[8] << 8);
 275         }
 276         break;
 277     }
 278     return 0;
 279 }
 280
 281 static int scsi_req_stream_length(SCSIRequest *req, uint8_t *cmd)
 282 {
 283     switch(cmd[0]) {
 284     /* stream commands */
 285     case READ_6:
 286     case READ_REVERSE:
 287     case RECOVER_BUFFERED_DATA:
 288     case WRITE_6:
 289         req->cmd.len = 6;
 290         req->cmd.xfer = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
 291         if (cmd[1] & 0x01) /* fixed */
 292             req->cmd.xfer *= req->dev->blocksize;
 293         break;
 294     case REWIND:
 295     case START_STOP:
 296         req->cmd.len = 6;
 297         req->cmd.xfer = 0;
 298         break;
 299     /* generic commands */
 300     default:
 301         return scsi_req_length(req, cmd);
 302     }
 303     return 0;
 304 }
 305
 306 static void scsi_req_xfer_mode(SCSIRequest *req)
 307 {
 308     switch (req->cmd.buf[0]) {
 309     case WRITE_6:
 310     case WRITE_10:
 311     case WRITE_VERIFY:
 312     case WRITE_12:
 313     case WRITE_VERIFY_12:
 314     case WRITE_16:
 315     case WRITE_VERIFY_16:
 316     case COPY:
 317     case COPY_VERIFY:
 318     case COMPARE:
 319     case CHANGE_DEFINITION:
 320     case LOG_SELECT:
 321     case MODE_SELECT:
 322     case MODE_SELECT_10:
 323     case SEND_DIAGNOSTIC:
 324     case WRITE_BUFFER:
 325     case FORMAT_UNIT:
 326     case REASSIGN_BLOCKS:
 327     case SEARCH_EQUAL:
 328     case SEARCH_HIGH:
 329     case SEARCH_LOW:
 330     case UPDATE_BLOCK:
 331     case WRITE_LONG:
 332     case WRITE_SAME:
 333     case SEARCH_HIGH_12:
 334     case SEARCH_EQUAL_12:
 335     case SEARCH_LOW_12:
 336     case SET_WINDOW:
 337     case MEDIUM_SCAN:
 338     case SEND_VOLUME_TAG:
 339     case WRITE_LONG_2:
 340     case PERSISTENT_RESERVE_OUT:
 341     case MAINTENANCE_OUT:
 342         req->cmd.mode = SCSI_XFER_TO_DEV;
 343         break;
 344     default:
 345         if (req->cmd.xfer)
 346             req->cmd.mode = SCSI_XFER_FROM_DEV;
 347         else {
 348             req->cmd.mode = SCSI_XFER_NONE;
 349         }
 350         break;
 351     }
 352 }
 353
 354 static uint64_t scsi_req_lba(SCSIRequest *req)
 355 {
 356     uint8_t *buf = req->cmd.buf;
 357     uint64_t lba;
 358
 359     switch (buf[0] >> 5) {
 360     case 0:
 361         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 362               (((uint64_t) buf[1] & 0x1f) << 16);
 363         break;
 364     case 1:
 365     case 2:
 366         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 367               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 368         break;
 369     case 4:
 370         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 371               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 372               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 373               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 374         break;
 375     case 5:
 376         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 377               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 378         break;
 379     default:
 380         lba = -1;
 381
 382     }
 383     return lba;
 384 }
 385
 386 int scsi_req_parse(SCSIRequest *req, uint8_t *buf)
 387 {
 388     int rc;
 389
 390     if (req->dev->type == TYPE_TAPE) {
 391         rc = scsi_req_stream_length(req, buf);
 392     } else {
 393         rc = scsi_req_length(req, buf);
 394     }
 395     if (rc != 0)
 396         return rc;
 397
 398     memcpy(req->cmd.buf, buf, req->cmd.len);
 399     scsi_req_xfer_mode(req);
 400     req->cmd.lba = scsi_req_lba(req);
 401     trace_scsi_req_parsed(req->dev->id, req->lun, req->tag, buf[0],
 402                           req->cmd.mode, req->cmd.xfer, req->cmd.lba);
 403     return 0;
 404 }
 405
 406 /*
 407  * Predefined sense codes
 408  */
 409
 410 /* No sense data available */
 411 const struct SCSISense sense_code_NO_SENSE = {
 412     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
 413 };
 414
 415 /* LUN not ready, Manual intervention required */
 416 const struct SCSISense sense_code_LUN_NOT_READY = {
 417     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
 418 };
 419
 420 /* LUN not ready, Medium not present */
 421 const struct SCSISense sense_code_NO_MEDIUM = {
 422     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
 423 };
 424
 425 /* Hardware error, internal target failure */
 426 const struct SCSISense sense_code_TARGET_FAILURE = {
 427     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
 428 };
 429
 430 /* Illegal request, invalid command operation code */
 431 const struct SCSISense sense_code_INVALID_OPCODE = {
 432     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
 433 };
 434
 435 /* Illegal request, LBA out of range */
 436 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
 437     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
 438 };
 439
 440 /* Illegal request, Invalid field in CDB */
 441 const struct SCSISense sense_code_INVALID_FIELD = {
 442     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
 443 };
 444
 445 /* Illegal request, LUN not supported */
 446 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
 447     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
 448 };
 449
 450 /* Command aborted, I/O process terminated */
 451 const struct SCSISense sense_code_IO_ERROR = {
 452     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
 453 };
 454
 455 /* Command aborted, I_T Nexus loss occurred */
 456 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
 457     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
 458 };
 459
 460 /* Command aborted, Logical Unit failure */
 461 const struct SCSISense sense_code_LUN_FAILURE = {
 462     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
 463 };
 464
 465 /*
 466  * scsi_build_sense
 467  *
 468  * Build a sense buffer
 469  */
 470 int scsi_build_sense(SCSISense sense, uint8_t *buf, int len, int fixed)
 471 {
 472     if (!fixed && len < 8) {
 473         return 0;
 474     }
 475
 476     memset(buf, 0, len);
 477     if (fixed) {
 478         /* Return fixed format sense buffer */
 479         buf[0] = 0xf0;
 480         buf[2] = sense.key;
 481         buf[7] = 7;
 482         buf[12] = sense.asc;
 483         buf[13] = sense.ascq;
 484         return MIN(len, 18);
 485     } else {
 486         /* Return descriptor format sense buffer */
 487         buf[0] = 0x72;
 488         buf[1] = sense.key;
 489         buf[2] = sense.asc;
 490         buf[3] = sense.ascq;
 491         return 8;
 492     }
 493 }
 494
 495 static const char *scsi_command_name(uint8_t cmd)
 496 {
 497     static const char *names[] = {
 498         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 499         [ REZERO_UNIT              ] = "REZERO_UNIT",
 500         /* REWIND and REZERO_UNIT use the same operation code */
 501         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 502         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 503         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 504         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
 505         [ READ_6                   ] = "READ_6",
 506         [ WRITE_6                  ] = "WRITE_6",
 507         [ SEEK_6                   ] = "SEEK_6",
 508         [ READ_REVERSE             ] = "READ_REVERSE",
 509         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 510         [ SPACE                    ] = "SPACE",
 511         [ INQUIRY                  ] = "INQUIRY",
 512         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 513         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 514         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 515         [ MODE_SELECT              ] = "MODE_SELECT",
 516         [ RESERVE                  ] = "RESERVE",
 517         [ RELEASE                  ] = "RELEASE",
 518         [ COPY                     ] = "COPY",
 519         [ ERASE                    ] = "ERASE",
 520         [ MODE_SENSE               ] = "MODE_SENSE",
 521         [ START_STOP               ] = "START_STOP",
 522         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 523         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 524         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 525
 526         [ SET_WINDOW               ] = "SET_WINDOW",
 527         [ READ_CAPACITY            ] = "READ_CAPACITY",
 528         [ READ_10                  ] = "READ_10",
 529         [ WRITE_10                 ] = "WRITE_10",
 530         [ SEEK_10                  ] = "SEEK_10",
 531         [ WRITE_VERIFY             ] = "WRITE_VERIFY",
 532         [ VERIFY                   ] = "VERIFY",
 533         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 534         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 535         [ SEARCH_LOW               ] = "SEARCH_LOW",
 536         [ SET_LIMITS               ] = "SET_LIMITS",
 537         [ PRE_FETCH                ] = "PRE_FETCH",
 538         /* READ_POSITION and PRE_FETCH use the same operation code */
 539         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 540         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 541         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
 542         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 543         [ COMPARE                  ] = "COMPARE",
 544         [ COPY_VERIFY              ] = "COPY_VERIFY",
 545         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 546         [ READ_BUFFER              ] = "READ_BUFFER",
 547         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 548         [ READ_LONG                ] = "READ_LONG",
 549         [ WRITE_LONG               ] = "WRITE_LONG",
 550         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 551         [ WRITE_SAME               ] = "WRITE_SAME",
 552         [ READ_TOC                 ] = "READ_TOC",
 553         [ LOG_SELECT               ] = "LOG_SELECT",
 554         [ LOG_SENSE                ] = "LOG_SENSE",
 555         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 556         [ RESERVE_10               ] = "RESERVE_10",
 557         [ RELEASE_10               ] = "RELEASE_10",
 558         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 559         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 560         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 561         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 562         [ READ_12                  ] = "READ_12",
 563         [ WRITE_12                 ] = "WRITE_12",
 564         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 565         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 566         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 567         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 568         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 569         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG",
 570         [ WRITE_LONG_2             ] = "WRITE_LONG_2",
 571
 572         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 573         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 574         [ READ_16                  ] = "READ_16",
 575         [ WRITE_16                 ] = "WRITE_16",
 576         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 577         [ SERVICE_ACTION_IN        ] = "SERVICE_ACTION_IN",
 578         [ REPORT_LUNS              ] = "REPORT_LUNS",
 579         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
 580         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 581         [ BLANK                    ] = "BLANK",
 582     };
 583
 584     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
 585         return "*UNKNOWN*";
 586     return names[cmd];
 587 }
 588
 589 SCSIRequest *scsi_req_ref(SCSIRequest *req)
 590 {
 591     req->refcount++;
 592     return req;
 593 }
 594
 595 void scsi_req_unref(SCSIRequest *req)
 596 {
 597     if (--req->refcount == 0) {
 598         if (req->dev->info->free_req) {
 599             req->dev->info->free_req(req);
 600         }
 601         qemu_free(req);
 602     }
 603 }
 604
 605 /* Tell the device that we finished processing this chunk of I/O.  It
 606    will start the next chunk or complete the command.  */
 607 void scsi_req_continue(SCSIRequest *req)
 608 {
 609     trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
 610     if (req->cmd.mode == SCSI_XFER_TO_DEV) {
 611         req->dev->info->write_data(req);
 612     } else {
 613         req->dev->info->read_data(req);
 614     }
 615 }
 616
 617 /* Called by the devices when data is ready for the HBA.  The HBA should
 618    start a DMA operation to read or fill the device's data buffer.
 619    Once it completes, calling scsi_req_continue will restart I/O.  */
 620 void scsi_req_data(SCSIRequest *req, int len)
 621 {
 622     trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
 623     req->bus->ops->complete(req, SCSI_REASON_DATA, len);
 624 }
 625
 626 void scsi_req_print(SCSIRequest *req)
 627 {
 628     FILE *fp = stderr;
 629     int i;
 630
 631     fprintf(fp, "[%s id=%d] %s",
 632             req->dev->qdev.parent_bus->name,
 633             req->dev->id,
 634             scsi_command_name(req->cmd.buf[0]));
 635     for (i = 1; i < req->cmd.len; i++) {
 636         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
 637     }
 638     switch (req->cmd.mode) {
 639     case SCSI_XFER_NONE:
 640         fprintf(fp, " - none\n");
 641         break;
 642     case SCSI_XFER_FROM_DEV:
 643         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
 644         break;
 645     case SCSI_XFER_TO_DEV:
 646         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
 647         break;
 648     default:
 649         fprintf(fp, " - Oops\n");
 650         break;
 651     }
 652 }
 653
 654 void scsi_req_complete(SCSIRequest *req)
 655 {
 656     assert(req->status != -1);
 657     scsi_req_ref(req);
 658     scsi_req_dequeue(req);
 659     req->bus->ops->complete(req, SCSI_REASON_DONE, req->status);
 660     scsi_req_unref(req);
 661 }
 662
 663 void scsi_req_cancel(SCSIRequest *req)
 664 {
 665     if (req->dev && req->dev->info->cancel_io) {
 666         req->dev->info->cancel_io(req);
 667     }
 668     scsi_req_ref(req);
 669     scsi_req_dequeue(req);
 670     if (req->bus->ops->cancel) {
 671         req->bus->ops->cancel(req);
 672     }
 673     scsi_req_unref(req);
 674 }
 675
 676 void scsi_req_abort(SCSIRequest *req, int status)
 677 {
 678     req->status = status;
 679     if (req->dev && req->dev->info->cancel_io) {
 680         req->dev->info->cancel_io(req);
 681     }
 682     scsi_req_complete(req);
 683 }
 684
 685 void scsi_device_purge_requests(SCSIDevice *sdev)
 686 {
 687     SCSIRequest *req;
 688
 689     while (!QTAILQ_EMPTY(&sdev->requests)) {
 690         req = QTAILQ_FIRST(&sdev->requests);
 691         scsi_req_cancel(req);
 692     }
 693 }
 694
 695 static char *scsibus_get_fw_dev_path(DeviceState *dev)
 696 {
 697     SCSIDevice *d = (SCSIDevice*)dev;
 698     SCSIBus *bus = scsi_bus_from_device(d);
 699     char path[100];
 700     int i;
 701
 702     for (i = 0; i < bus->ndev; i++) {
 703         if (bus->devs[i] == d) {
 704             break;
 705         }
 706     }
 707
 708     assert(i != bus->ndev);
 709
 710     snprintf(path, sizeof(path), "%s@%x", qdev_fw_name(dev), i);
 711
 712     return strdup(path);
 713 }