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,
 135                             uint32_t lun, void *hba_private)
 136 {
 137     SCSIRequest *req;
 138
 139     req = qemu_mallocz(size);
 140     req->refcount = 1;
 141     req->bus = scsi_bus_from_device(d);
 142     req->dev = d;
 143     req->tag = tag;
 144     req->lun = lun;
 145     req->hba_private = hba_private;
 146     req->status = -1;
 147     trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
 148     return req;
 149 }
 150
 151 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
 152                           void *hba_private)
 153 {
 154     return d->info->alloc_req(d, tag, lun, hba_private);
 155 }
 156
 157 uint8_t *scsi_req_get_buf(SCSIRequest *req)
 158 {
 159     return req->dev->info->get_buf(req);
 160 }
 161
 162 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
 163 {
 164     if (req->dev->info->get_sense) {
 165         return req->dev->info->get_sense(req, buf, len);
 166     } else {
 167         return 0;
 168     }
 169 }
 170
 171 int32_t scsi_req_enqueue(SCSIRequest *req, uint8_t *buf)
 172 {
 173     int32_t rc;
 174
 175     assert(!req->enqueued);
 176     scsi_req_ref(req);
 177     req->enqueued = true;
 178     QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
 179
 180     scsi_req_ref(req);
 181     rc = req->dev->info->send_command(req, buf);
 182     scsi_req_unref(req);
 183     return rc;
 184 }
 185
 186 static void scsi_req_dequeue(SCSIRequest *req)
 187 {
 188     trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
 189     if (req->enqueued) {
 190         QTAILQ_REMOVE(&req->dev->requests, req, next);
 191         req->enqueued = false;
 192         scsi_req_unref(req);
 193     }
 194 }
 195
 196 static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
 197 {
 198     switch (cmd[0] >> 5) {
 199     case 0:
 200         req->cmd.xfer = cmd[4];
 201         req->cmd.len = 6;
 202         /* length 0 means 256 blocks */
 203         if (req->cmd.xfer == 0)
 204             req->cmd.xfer = 256;
 205         break;
 206     case 1:
 207     case 2:
 208         req->cmd.xfer = cmd[8] | (cmd[7] << 8);
 209         req->cmd.len = 10;
 210         break;
 211     case 4:
 212         req->cmd.xfer = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
 213         req->cmd.len = 16;
 214         break;
 215     case 5:
 216         req->cmd.xfer = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
 217         req->cmd.len = 12;
 218         break;
 219     default:
 220         trace_scsi_req_parse_bad(req->dev->id, req->lun, req->tag, cmd[0]);
 221         return -1;
 222     }
 223
 224     switch(cmd[0]) {
 225     case TEST_UNIT_READY:
 226     case REZERO_UNIT:
 227     case START_STOP:
 228     case SEEK_6:
 229     case WRITE_FILEMARKS:
 230     case SPACE:
 231     case RESERVE:
 232     case RELEASE:
 233     case ERASE:
 234     case ALLOW_MEDIUM_REMOVAL:
 235     case VERIFY:
 236     case SEEK_10:
 237     case SYNCHRONIZE_CACHE:
 238     case LOCK_UNLOCK_CACHE:
 239     case LOAD_UNLOAD:
 240     case SET_CD_SPEED:
 241     case SET_LIMITS:
 242     case WRITE_LONG:
 243     case MOVE_MEDIUM:
 244     case UPDATE_BLOCK:
 245         req->cmd.xfer = 0;
 246         break;
 247     case MODE_SENSE:
 248         break;
 249     case WRITE_SAME:
 250         req->cmd.xfer = 1;
 251         break;
 252     case READ_CAPACITY:
 253         req->cmd.xfer = 8;
 254         break;
 255     case READ_BLOCK_LIMITS:
 256         req->cmd.xfer = 6;
 257         break;
 258     case READ_POSITION:
 259         req->cmd.xfer = 20;
 260         break;
 261     case SEND_VOLUME_TAG:
 262         req->cmd.xfer *= 40;
 263         break;
 264     case MEDIUM_SCAN:
 265         req->cmd.xfer *= 8;
 266         break;
 267     case WRITE_10:
 268     case WRITE_VERIFY:
 269     case WRITE_6:
 270     case WRITE_12:
 271     case WRITE_VERIFY_12:
 272     case WRITE_16:
 273     case WRITE_VERIFY_16:
 274         req->cmd.xfer *= req->dev->blocksize;
 275         break;
 276     case READ_10:
 277     case READ_6:
 278     case READ_REVERSE:
 279     case RECOVER_BUFFERED_DATA:
 280     case READ_12:
 281     case READ_16:
 282         req->cmd.xfer *= req->dev->blocksize;
 283         break;
 284     case INQUIRY:
 285         req->cmd.xfer = cmd[4] | (cmd[3] << 8);
 286         break;
 287     case MAINTENANCE_OUT:
 288     case MAINTENANCE_IN:
 289         if (req->dev->type == TYPE_ROM) {
 290             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 291             req->cmd.xfer = cmd[9] | (cmd[8] << 8);
 292         }
 293         break;
 294     }
 295     return 0;
 296 }
 297
 298 static int scsi_req_stream_length(SCSIRequest *req, uint8_t *cmd)
 299 {
 300     switch(cmd[0]) {
 301     /* stream commands */
 302     case READ_6:
 303     case READ_REVERSE:
 304     case RECOVER_BUFFERED_DATA:
 305     case WRITE_6:
 306         req->cmd.len = 6;
 307         req->cmd.xfer = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
 308         if (cmd[1] & 0x01) /* fixed */
 309             req->cmd.xfer *= req->dev->blocksize;
 310         break;
 311     case REWIND:
 312     case START_STOP:
 313         req->cmd.len = 6;
 314         req->cmd.xfer = 0;
 315         break;
 316     /* generic commands */
 317     default:
 318         return scsi_req_length(req, cmd);
 319     }
 320     return 0;
 321 }
 322
 323 static void scsi_req_xfer_mode(SCSIRequest *req)
 324 {
 325     switch (req->cmd.buf[0]) {
 326     case WRITE_6:
 327     case WRITE_10:
 328     case WRITE_VERIFY:
 329     case WRITE_12:
 330     case WRITE_VERIFY_12:
 331     case WRITE_16:
 332     case WRITE_VERIFY_16:
 333     case COPY:
 334     case COPY_VERIFY:
 335     case COMPARE:
 336     case CHANGE_DEFINITION:
 337     case LOG_SELECT:
 338     case MODE_SELECT:
 339     case MODE_SELECT_10:
 340     case SEND_DIAGNOSTIC:
 341     case WRITE_BUFFER:
 342     case FORMAT_UNIT:
 343     case REASSIGN_BLOCKS:
 344     case SEARCH_EQUAL:
 345     case SEARCH_HIGH:
 346     case SEARCH_LOW:
 347     case UPDATE_BLOCK:
 348     case WRITE_LONG:
 349     case WRITE_SAME:
 350     case SEARCH_HIGH_12:
 351     case SEARCH_EQUAL_12:
 352     case SEARCH_LOW_12:
 353     case SET_WINDOW:
 354     case MEDIUM_SCAN:
 355     case SEND_VOLUME_TAG:
 356     case WRITE_LONG_2:
 357     case PERSISTENT_RESERVE_OUT:
 358     case MAINTENANCE_OUT:
 359         req->cmd.mode = SCSI_XFER_TO_DEV;
 360         break;
 361     default:
 362         if (req->cmd.xfer)
 363             req->cmd.mode = SCSI_XFER_FROM_DEV;
 364         else {
 365             req->cmd.mode = SCSI_XFER_NONE;
 366         }
 367         break;
 368     }
 369 }
 370
 371 static uint64_t scsi_req_lba(SCSIRequest *req)
 372 {
 373     uint8_t *buf = req->cmd.buf;
 374     uint64_t lba;
 375
 376     switch (buf[0] >> 5) {
 377     case 0:
 378         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 379               (((uint64_t) buf[1] & 0x1f) << 16);
 380         break;
 381     case 1:
 382     case 2:
 383         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 384               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 385         break;
 386     case 4:
 387         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 388               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 389               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 390               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 391         break;
 392     case 5:
 393         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 394               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 395         break;
 396     default:
 397         lba = -1;
 398
 399     }
 400     return lba;
 401 }
 402
 403 int scsi_req_parse(SCSIRequest *req, uint8_t *buf)
 404 {
 405     int rc;
 406
 407     if (req->dev->type == TYPE_TAPE) {
 408         rc = scsi_req_stream_length(req, buf);
 409     } else {
 410         rc = scsi_req_length(req, buf);
 411     }
 412     if (rc != 0)
 413         return rc;
 414
 415     memcpy(req->cmd.buf, buf, req->cmd.len);
 416     scsi_req_xfer_mode(req);
 417     req->cmd.lba = scsi_req_lba(req);
 418     trace_scsi_req_parsed(req->dev->id, req->lun, req->tag, buf[0],
 419                           req->cmd.mode, req->cmd.xfer);
 420     if (req->cmd.lba != -1) {
 421         trace_scsi_req_parsed_lba(req->dev->id, req->lun, req->tag, buf[0],
 422                               req->cmd.lba);
 423     }
 424     return 0;
 425 }
 426
 427 /*
 428  * Predefined sense codes
 429  */
 430
 431 /* No sense data available */
 432 const struct SCSISense sense_code_NO_SENSE = {
 433     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
 434 };
 435
 436 /* LUN not ready, Manual intervention required */
 437 const struct SCSISense sense_code_LUN_NOT_READY = {
 438     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
 439 };
 440
 441 /* LUN not ready, Medium not present */
 442 const struct SCSISense sense_code_NO_MEDIUM = {
 443     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
 444 };
 445
 446 /* Hardware error, internal target failure */
 447 const struct SCSISense sense_code_TARGET_FAILURE = {
 448     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
 449 };
 450
 451 /* Illegal request, invalid command operation code */
 452 const struct SCSISense sense_code_INVALID_OPCODE = {
 453     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
 454 };
 455
 456 /* Illegal request, LBA out of range */
 457 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
 458     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
 459 };
 460
 461 /* Illegal request, Invalid field in CDB */
 462 const struct SCSISense sense_code_INVALID_FIELD = {
 463     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
 464 };
 465
 466 /* Illegal request, LUN not supported */
 467 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
 468     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
 469 };
 470
 471 /* Command aborted, I/O process terminated */
 472 const struct SCSISense sense_code_IO_ERROR = {
 473     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
 474 };
 475
 476 /* Command aborted, I_T Nexus loss occurred */
 477 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
 478     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
 479 };
 480
 481 /* Command aborted, Logical Unit failure */
 482 const struct SCSISense sense_code_LUN_FAILURE = {
 483     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
 484 };
 485
 486 /*
 487  * scsi_build_sense
 488  *
 489  * Build a sense buffer
 490  */
 491 int scsi_build_sense(SCSISense sense, uint8_t *buf, int len, int fixed)
 492 {
 493     if (!fixed && len < 8) {
 494         return 0;
 495     }
 496
 497     memset(buf, 0, len);
 498     if (fixed) {
 499         /* Return fixed format sense buffer */
 500         buf[0] = 0xf0;
 501         buf[2] = sense.key;
 502         buf[7] = 7;
 503         buf[12] = sense.asc;
 504         buf[13] = sense.ascq;
 505         return MIN(len, 18);
 506     } else {
 507         /* Return descriptor format sense buffer */
 508         buf[0] = 0x72;
 509         buf[1] = sense.key;
 510         buf[2] = sense.asc;
 511         buf[3] = sense.ascq;
 512         return 8;
 513     }
 514 }
 515
 516 static const char *scsi_command_name(uint8_t cmd)
 517 {
 518     static const char *names[] = {
 519         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 520         [ REZERO_UNIT              ] = "REZERO_UNIT",
 521         /* REWIND and REZERO_UNIT use the same operation code */
 522         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 523         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 524         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 525         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
 526         [ READ_6                   ] = "READ_6",
 527         [ WRITE_6                  ] = "WRITE_6",
 528         [ SEEK_6                   ] = "SEEK_6",
 529         [ READ_REVERSE             ] = "READ_REVERSE",
 530         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 531         [ SPACE                    ] = "SPACE",
 532         [ INQUIRY                  ] = "INQUIRY",
 533         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 534         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 535         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 536         [ MODE_SELECT              ] = "MODE_SELECT",
 537         [ RESERVE                  ] = "RESERVE",
 538         [ RELEASE                  ] = "RELEASE",
 539         [ COPY                     ] = "COPY",
 540         [ ERASE                    ] = "ERASE",
 541         [ MODE_SENSE               ] = "MODE_SENSE",
 542         [ START_STOP               ] = "START_STOP",
 543         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 544         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 545         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 546
 547         [ SET_WINDOW               ] = "SET_WINDOW",
 548         [ READ_CAPACITY            ] = "READ_CAPACITY",
 549         [ READ_10                  ] = "READ_10",
 550         [ WRITE_10                 ] = "WRITE_10",
 551         [ SEEK_10                  ] = "SEEK_10",
 552         [ WRITE_VERIFY             ] = "WRITE_VERIFY",
 553         [ VERIFY                   ] = "VERIFY",
 554         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 555         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 556         [ SEARCH_LOW               ] = "SEARCH_LOW",
 557         [ SET_LIMITS               ] = "SET_LIMITS",
 558         [ PRE_FETCH                ] = "PRE_FETCH",
 559         /* READ_POSITION and PRE_FETCH use the same operation code */
 560         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 561         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 562         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
 563         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 564         [ COMPARE                  ] = "COMPARE",
 565         [ COPY_VERIFY              ] = "COPY_VERIFY",
 566         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 567         [ READ_BUFFER              ] = "READ_BUFFER",
 568         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 569         [ READ_LONG                ] = "READ_LONG",
 570         [ WRITE_LONG               ] = "WRITE_LONG",
 571         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 572         [ WRITE_SAME               ] = "WRITE_SAME",
 573         [ READ_TOC                 ] = "READ_TOC",
 574         [ LOG_SELECT               ] = "LOG_SELECT",
 575         [ LOG_SENSE                ] = "LOG_SENSE",
 576         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 577         [ RESERVE_10               ] = "RESERVE_10",
 578         [ RELEASE_10               ] = "RELEASE_10",
 579         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 580         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 581         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 582         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 583         [ READ_12                  ] = "READ_12",
 584         [ WRITE_12                 ] = "WRITE_12",
 585         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 586         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 587         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 588         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 589         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 590         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG",
 591         [ WRITE_LONG_2             ] = "WRITE_LONG_2",
 592
 593         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 594         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 595         [ READ_16                  ] = "READ_16",
 596         [ WRITE_16                 ] = "WRITE_16",
 597         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 598         [ SERVICE_ACTION_IN        ] = "SERVICE_ACTION_IN",
 599         [ REPORT_LUNS              ] = "REPORT_LUNS",
 600         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
 601         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 602         [ BLANK                    ] = "BLANK",
 603     };
 604
 605     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
 606         return "*UNKNOWN*";
 607     return names[cmd];
 608 }
 609
 610 SCSIRequest *scsi_req_ref(SCSIRequest *req)
 611 {
 612     req->refcount++;
 613     return req;
 614 }
 615
 616 void scsi_req_unref(SCSIRequest *req)
 617 {
 618     if (--req->refcount == 0) {
 619         if (req->dev->info->free_req) {
 620             req->dev->info->free_req(req);
 621         }
 622         qemu_free(req);
 623     }
 624 }
 625
 626 /* Tell the device that we finished processing this chunk of I/O.  It
 627    will start the next chunk or complete the command.  */
 628 void scsi_req_continue(SCSIRequest *req)
 629 {
 630     trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
 631     if (req->cmd.mode == SCSI_XFER_TO_DEV) {
 632         req->dev->info->write_data(req);
 633     } else {
 634         req->dev->info->read_data(req);
 635     }
 636 }
 637
 638 /* Called by the devices when data is ready for the HBA.  The HBA should
 639    start a DMA operation to read or fill the device's data buffer.
 640    Once it completes, calling scsi_req_continue will restart I/O.  */
 641 void scsi_req_data(SCSIRequest *req, int len)
 642 {
 643     trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
 644     req->bus->ops->transfer_data(req, len);
 645 }
 646
 647 void scsi_req_print(SCSIRequest *req)
 648 {
 649     FILE *fp = stderr;
 650     int i;
 651
 652     fprintf(fp, "[%s id=%d] %s",
 653             req->dev->qdev.parent_bus->name,
 654             req->dev->id,
 655             scsi_command_name(req->cmd.buf[0]));
 656     for (i = 1; i < req->cmd.len; i++) {
 657         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
 658     }
 659     switch (req->cmd.mode) {
 660     case SCSI_XFER_NONE:
 661         fprintf(fp, " - none\n");
 662         break;
 663     case SCSI_XFER_FROM_DEV:
 664         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
 665         break;
 666     case SCSI_XFER_TO_DEV:
 667         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
 668         break;
 669     default:
 670         fprintf(fp, " - Oops\n");
 671         break;
 672     }
 673 }
 674
 675 void scsi_req_complete(SCSIRequest *req)
 676 {
 677     assert(req->status != -1);
 678     scsi_req_ref(req);
 679     scsi_req_dequeue(req);
 680     req->bus->ops->complete(req, req->status);
 681     scsi_req_unref(req);
 682 }
 683
 684 void scsi_req_cancel(SCSIRequest *req)
 685 {
 686     if (req->dev && req->dev->info->cancel_io) {
 687         req->dev->info->cancel_io(req);
 688     }
 689     scsi_req_ref(req);
 690     scsi_req_dequeue(req);
 691     if (req->bus->ops->cancel) {
 692         req->bus->ops->cancel(req);
 693     }
 694     scsi_req_unref(req);
 695 }
 696
 697 void scsi_req_abort(SCSIRequest *req, int status)
 698 {
 699     req->status = status;
 700     if (req->dev && req->dev->info->cancel_io) {
 701         req->dev->info->cancel_io(req);
 702     }
 703     scsi_req_complete(req);
 704 }
 705
 706 void scsi_device_purge_requests(SCSIDevice *sdev)
 707 {
 708     SCSIRequest *req;
 709
 710     while (!QTAILQ_EMPTY(&sdev->requests)) {
 711         req = QTAILQ_FIRST(&sdev->requests);
 712         scsi_req_cancel(req);
 713     }
 714 }
 715
 716 static char *scsibus_get_fw_dev_path(DeviceState *dev)
 717 {
 718     SCSIDevice *d = (SCSIDevice*)dev;
 719     SCSIBus *bus = scsi_bus_from_device(d);
 720     char path[100];
 721     int i;
 722
 723     for (i = 0; i < bus->ndev; i++) {
 724         if (bus->devs[i] == d) {
 725             break;
 726         }
 727     }
 728
 729     assert(i != bus->ndev);
 730
 731     snprintf(path, sizeof(path), "%s@%x", qdev_fw_name(dev), i);
 732
 733     return strdup(path);
 734 }