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 static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
  11 static int scsi_build_sense(uint8_t *in_buf, int in_len,
  12                             uint8_t *buf, int len, bool fixed);
  13
  14 static struct BusInfo scsi_bus_info = {
  15     .name  = "SCSI",
  16     .size  = sizeof(SCSIBus),
  17     .get_fw_dev_path = scsibus_get_fw_dev_path,
  18     .props = (Property[]) {
  19         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  20         DEFINE_PROP_UINT32("lun", SCSIDevice, lun, 0),
  21         DEFINE_PROP_END_OF_LIST(),
  22     },
  23 };
  24 static int next_scsi_bus;
  25
  26 /* Create a scsi bus, and attach devices to it.  */
  27 void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
  28                   const SCSIBusOps *ops)
  29 {
  30     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
  31     bus->busnr = next_scsi_bus++;
  32     bus->tcq = tcq;
  33     bus->ndev = ndev;
  34     bus->ops = ops;
  35     bus->qbus.allow_hotplug = 1;
  36 }
  37
  38 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  39 {
  40     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  41     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  42     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  43     int rc = -1;
  44
  45     if (dev->id == -1) {
  46         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  47             if (bus->devs[dev->id] == NULL)
  48                 break;
  49         }
  50     }
  51     if (dev->id >= bus->ndev) {
  52         error_report("bad scsi device id: %d", dev->id);
  53         goto err;
  54     }
  55
  56     if (bus->devs[dev->id]) {
  57         qdev_free(&bus->devs[dev->id]->qdev);
  58     }
  59     bus->devs[dev->id] = dev;
  60
  61     dev->info = info;
  62     QTAILQ_INIT(&dev->requests);
  63     rc = dev->info->init(dev);
  64     if (rc != 0) {
  65         bus->devs[dev->id] = NULL;
  66     }
  67
  68 err:
  69     return rc;
  70 }
  71
  72 static int scsi_qdev_exit(DeviceState *qdev)
  73 {
  74     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  75     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  76
  77     assert(bus->devs[dev->id] != NULL);
  78     if (bus->devs[dev->id]->info->destroy) {
  79         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  80     }
  81     bus->devs[dev->id] = NULL;
  82     return 0;
  83 }
  84
  85 void scsi_qdev_register(SCSIDeviceInfo *info)
  86 {
  87     info->qdev.bus_info = &scsi_bus_info;
  88     info->qdev.init     = scsi_qdev_init;
  89     info->qdev.unplug   = qdev_simple_unplug_cb;
  90     info->qdev.exit     = scsi_qdev_exit;
  91     qdev_register(&info->qdev);
  92 }
  93
  94 /* handle legacy '-drive if=scsi,...' cmd line args */
  95 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
  96                                       int unit, bool removable)
  97 {
  98     const char *driver;
  99     DeviceState *dev;
 100
 101     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
 102     dev = qdev_create(&bus->qbus, driver);
 103     qdev_prop_set_uint32(dev, "scsi-id", unit);
 104     if (qdev_prop_exists(dev, "removable")) {
 105         qdev_prop_set_bit(dev, "removable", removable);
 106     }
 107     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
 108         qdev_free(dev);
 109         return NULL;
 110     }
 111     if (qdev_init(dev) < 0)
 112         return NULL;
 113     return DO_UPCAST(SCSIDevice, qdev, dev);
 114 }
 115
 116 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 117 {
 118     Location loc;
 119     DriveInfo *dinfo;
 120     int res = 0, unit;
 121
 122     loc_push_none(&loc);
 123     for (unit = 0; unit < bus->ndev; unit++) {
 124         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 125         if (dinfo == NULL) {
 126             continue;
 127         }
 128         qemu_opts_loc_restore(dinfo->opts);
 129         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit, false)) {
 130             res = -1;
 131             break;
 132         }
 133     }
 134     loc_pop(&loc);
 135     return res;
 136 }
 137
 138 /* SCSIReqOps implementation for invalid commands.  */
 139
 140 static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf)
 141 {
 142     scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
 143     scsi_req_complete(req, CHECK_CONDITION);
 144     return 0;
 145 }
 146
 147 struct SCSIReqOps reqops_invalid_opcode = {
 148     .size         = sizeof(SCSIRequest),
 149     .send_command = scsi_invalid_command
 150 };
 151
 152 /* SCSIReqOps implementation for unit attention conditions.  */
 153
 154 static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf)
 155 {
 156     if (req->dev && req->dev->unit_attention.key == UNIT_ATTENTION) {
 157         scsi_req_build_sense(req, req->dev->unit_attention);
 158     } else if (req->bus->unit_attention.key == UNIT_ATTENTION) {
 159         scsi_req_build_sense(req, req->bus->unit_attention);
 160     }
 161     scsi_req_complete(req, CHECK_CONDITION);
 162     return 0;
 163 }
 164
 165 struct SCSIReqOps reqops_unit_attention = {
 166     .size         = sizeof(SCSIRequest),
 167     .send_command = scsi_unit_attention
 168 };
 169
 170 /* SCSIReqOps implementation for REPORT LUNS and for commands sent to
 171    an invalid LUN.  */
 172
 173 typedef struct SCSITargetReq SCSITargetReq;
 174
 175 struct SCSITargetReq {
 176     SCSIRequest req;
 177     int len;
 178     uint8_t buf[64];
 179 };
 180
 181 static void store_lun(uint8_t *outbuf, int lun)
 182 {
 183     if (lun < 256) {
 184         outbuf[1] = lun;
 185         return;
 186     }
 187     outbuf[1] = (lun & 255);
 188     outbuf[0] = (lun >> 8) | 0x40;
 189 }
 190
 191 static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
 192 {
 193     int len;
 194     if (r->req.cmd.xfer < 16) {
 195         return false;
 196     }
 197     if (r->req.cmd.buf[2] > 2) {
 198         return false;
 199     }
 200     len = MIN(sizeof r->buf, r->req.cmd.xfer);
 201     memset(r->buf, 0, len);
 202     if (r->req.dev->lun != 0) {
 203         r->buf[3] = 16;
 204         r->len = 24;
 205         store_lun(&r->buf[16], r->req.dev->lun);
 206     } else {
 207         r->buf[3] = 8;
 208         r->len = 16;
 209     }
 210     return true;
 211 }
 212
 213 static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
 214 {
 215     assert(r->req.dev->lun != r->req.lun);
 216     if (r->req.cmd.buf[1] & 0x2) {
 217         /* Command support data - optional, not implemented */
 218         return false;
 219     }
 220
 221     if (r->req.cmd.buf[1] & 0x1) {
 222         /* Vital product data */
 223         uint8_t page_code = r->req.cmd.buf[2];
 224         if (r->req.cmd.xfer < 4) {
 225             return false;
 226         }
 227
 228         r->buf[r->len++] = page_code ; /* this page */
 229         r->buf[r->len++] = 0x00;
 230
 231         switch (page_code) {
 232         case 0x00: /* Supported page codes, mandatory */
 233         {
 234             int pages;
 235             pages = r->len++;
 236             r->buf[r->len++] = 0x00; /* list of supported pages (this page) */
 237             r->buf[pages] = r->len - pages - 1; /* number of pages */
 238             break;
 239         }
 240         default:
 241             return false;
 242         }
 243         /* done with EVPD */
 244         assert(r->len < sizeof(r->buf));
 245         r->len = MIN(r->req.cmd.xfer, r->len);
 246         return true;
 247     }
 248
 249     /* Standard INQUIRY data */
 250     if (r->req.cmd.buf[2] != 0) {
 251         return false;
 252     }
 253
 254     /* PAGE CODE == 0 */
 255     if (r->req.cmd.xfer < 5) {
 256         return -1;
 257     }
 258
 259     r->len = MIN(r->req.cmd.xfer, 36);
 260     memset(r->buf, 0, r->len);
 261     if (r->req.lun != 0) {
 262         r->buf[0] = TYPE_NO_LUN;
 263     } else {
 264         r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE;
 265         r->buf[2] = 5; /* Version */
 266         r->buf[3] = 2 | 0x10; /* HiSup, response data format */
 267         r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */
 268         r->buf[7] = 0x10 | (r->req.bus->tcq ? 0x02 : 0); /* Sync, TCQ.  */
 269         memcpy(&r->buf[8], "QEMU    ", 8);
 270         memcpy(&r->buf[16], "QEMU TARGET     ", 16);
 271         strncpy((char *) &r->buf[32], QEMU_VERSION, 4);
 272     }
 273     return true;
 274 }
 275
 276 static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
 277 {
 278     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 279
 280     switch (buf[0]) {
 281     case REPORT_LUNS:
 282         if (!scsi_target_emulate_report_luns(r)) {
 283             goto illegal_request;
 284         }
 285         break;
 286     case INQUIRY:
 287         if (!scsi_target_emulate_inquiry(r)) {
 288             goto illegal_request;
 289         }
 290         break;
 291     case REQUEST_SENSE:
 292         if (req->cmd.xfer < 4) {
 293             goto illegal_request;
 294         }
 295         r->len = scsi_device_get_sense(r->req.dev, r->buf, req->cmd.xfer,
 296                                        (req->cmd.buf[1] & 1) == 0);
 297         break;
 298     default:
 299         scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
 300         scsi_req_complete(req, CHECK_CONDITION);
 301         return 0;
 302     illegal_request:
 303         scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
 304         scsi_req_complete(req, CHECK_CONDITION);
 305         return 0;
 306     }
 307
 308     if (!r->len) {
 309         scsi_req_complete(req, GOOD);
 310     }
 311     return r->len;
 312 }
 313
 314 static void scsi_target_read_data(SCSIRequest *req)
 315 {
 316     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 317     uint32_t n;
 318
 319     n = r->len;
 320     if (n > 0) {
 321         r->len = 0;
 322         scsi_req_data(&r->req, n);
 323     } else {
 324         scsi_req_complete(&r->req, GOOD);
 325     }
 326 }
 327
 328 static uint8_t *scsi_target_get_buf(SCSIRequest *req)
 329 {
 330     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 331
 332     return r->buf;
 333 }
 334
 335 struct SCSIReqOps reqops_target_command = {
 336     .size         = sizeof(SCSITargetReq),
 337     .send_command = scsi_target_send_command,
 338     .read_data    = scsi_target_read_data,
 339     .get_buf      = scsi_target_get_buf,
 340 };
 341
 342
 343 SCSIRequest *scsi_req_alloc(SCSIReqOps *reqops, SCSIDevice *d, uint32_t tag,
 344                             uint32_t lun, void *hba_private)
 345 {
 346     SCSIRequest *req;
 347
 348     req = qemu_mallocz(reqops->size);
 349     req->refcount = 1;
 350     req->bus = scsi_bus_from_device(d);
 351     req->dev = d;
 352     req->tag = tag;
 353     req->lun = lun;
 354     req->hba_private = hba_private;
 355     req->status = -1;
 356     req->sense_len = 0;
 357     req->ops = reqops;
 358     trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
 359     return req;
 360 }
 361
 362 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
 363                           uint8_t *buf, void *hba_private)
 364 {
 365     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus);
 366     SCSIRequest *req;
 367     SCSICommand cmd;
 368
 369     if (scsi_req_parse(&cmd, d, buf) != 0) {
 370         trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]);
 371         req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private);
 372     } else {
 373         trace_scsi_req_parsed(d->id, lun, tag, buf[0],
 374                               cmd.mode, cmd.xfer);
 375         if (cmd.lba != -1) {
 376             trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0],
 377                                       cmd.lba);
 378         }
 379
 380         if ((d->unit_attention.key == UNIT_ATTENTION ||
 381              bus->unit_attention.key == UNIT_ATTENTION) &&
 382             (buf[0] != INQUIRY &&
 383              buf[0] != REPORT_LUNS &&
 384              buf[0] != GET_CONFIGURATION &&
 385              buf[0] != GET_EVENT_STATUS_NOTIFICATION)) {
 386             req = scsi_req_alloc(&reqops_unit_attention, d, tag, lun,
 387                                  hba_private);
 388         } else if (lun != d->lun ||
 389             buf[0] == REPORT_LUNS ||
 390             buf[0] == REQUEST_SENSE) {
 391             req = scsi_req_alloc(&reqops_target_command, d, tag, lun,
 392                                  hba_private);
 393         } else {
 394             req = d->info->alloc_req(d, tag, lun, hba_private);
 395         }
 396     }
 397
 398     req->cmd = cmd;
 399     switch (buf[0]) {
 400     case INQUIRY:
 401         trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]);
 402         break;
 403     case TEST_UNIT_READY:
 404         trace_scsi_test_unit_ready(d->id, lun, tag);
 405         break;
 406     case REPORT_LUNS:
 407         trace_scsi_report_luns(d->id, lun, tag);
 408         break;
 409     case REQUEST_SENSE:
 410         trace_scsi_request_sense(d->id, lun, tag);
 411         break;
 412     default:
 413         break;
 414     }
 415
 416     return req;
 417 }
 418
 419 uint8_t *scsi_req_get_buf(SCSIRequest *req)
 420 {
 421     return req->ops->get_buf(req);
 422 }
 423
 424 static void scsi_clear_unit_attention(SCSIRequest *req)
 425 {
 426     SCSISense *ua;
 427     if (req->dev->unit_attention.key != UNIT_ATTENTION &&
 428         req->bus->unit_attention.key != UNIT_ATTENTION) {
 429         return;
 430     }
 431
 432     /*
 433      * If an INQUIRY command enters the enabled command state,
 434      * the device server shall [not] clear any unit attention condition;
 435      * See also MMC-6, paragraphs 6.5 and 6.6.2.
 436      */
 437     if (req->cmd.buf[0] == INQUIRY ||
 438         req->cmd.buf[0] == GET_CONFIGURATION ||
 439         req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) {
 440         return;
 441     }
 442
 443     if (req->dev->unit_attention.key == UNIT_ATTENTION) {
 444         ua = &req->dev->unit_attention;
 445     } else {
 446         ua = &req->bus->unit_attention;
 447     }
 448
 449     /*
 450      * If a REPORT LUNS command enters the enabled command state, [...]
 451      * the device server shall clear any pending unit attention condition
 452      * with an additional sense code of REPORTED LUNS DATA HAS CHANGED.
 453      */
 454     if (req->cmd.buf[0] == REPORT_LUNS &&
 455         !(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
 456           ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) {
 457         return;
 458     }
 459
 460     *ua = SENSE_CODE(NO_SENSE);
 461 }
 462
 463 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
 464 {
 465     int ret;
 466
 467     assert(len >= 14);
 468     if (!req->sense_len) {
 469         return 0;
 470     }
 471
 472     ret = scsi_build_sense(req->sense, req->sense_len, buf, len, true);
 473
 474     /*
 475      * FIXME: clearing unit attention conditions upon autosense should be done
 476      * only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b
 477      * (SAM-5, 5.14).
 478      *
 479      * We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and
 480      * 10b for HBAs that do not support it (do not call scsi_req_get_sense).
 481      * In the latter case, scsi_req_complete clears unit attention conditions
 482      * after moving them to the device's sense buffer.
 483      */
 484     scsi_clear_unit_attention(req);
 485     return ret;
 486 }
 487
 488 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed)
 489 {
 490     return scsi_build_sense(dev->sense, dev->sense_len, buf, len, fixed);
 491 }
 492
 493 void scsi_req_build_sense(SCSIRequest *req, SCSISense sense)
 494 {
 495     trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag,
 496                                sense.key, sense.asc, sense.ascq);
 497     memset(req->sense, 0, 18);
 498     req->sense[0] = 0xf0;
 499     req->sense[2] = sense.key;
 500     req->sense[12] = sense.asc;
 501     req->sense[13] = sense.ascq;
 502     req->sense_len = 18;
 503 }
 504
 505 int32_t scsi_req_enqueue(SCSIRequest *req)
 506 {
 507     int32_t rc;
 508
 509     assert(!req->enqueued);
 510     scsi_req_ref(req);
 511     req->enqueued = true;
 512     QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
 513
 514     scsi_req_ref(req);
 515     rc = req->ops->send_command(req, req->cmd.buf);
 516     scsi_req_unref(req);
 517     return rc;
 518 }
 519
 520 static void scsi_req_dequeue(SCSIRequest *req)
 521 {
 522     trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
 523     if (req->enqueued) {
 524         QTAILQ_REMOVE(&req->dev->requests, req, next);
 525         req->enqueued = false;
 526         scsi_req_unref(req);
 527     }
 528 }
 529
 530 static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 531 {
 532     switch (buf[0] >> 5) {
 533     case 0:
 534         cmd->xfer = buf[4];
 535         cmd->len = 6;
 536         /* length 0 means 256 blocks */
 537         if (cmd->xfer == 0) {
 538             cmd->xfer = 256;
 539         }
 540         break;
 541     case 1:
 542     case 2:
 543         cmd->xfer = buf[8] | (buf[7] << 8);
 544         cmd->len = 10;
 545         break;
 546     case 4:
 547         cmd->xfer = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
 548         cmd->len = 16;
 549         break;
 550     case 5:
 551         cmd->xfer = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
 552         cmd->len = 12;
 553         break;
 554     default:
 555         return -1;
 556     }
 557
 558     switch (buf[0]) {
 559     case TEST_UNIT_READY:
 560     case REWIND:
 561     case START_STOP:
 562     case SEEK_6:
 563     case WRITE_FILEMARKS:
 564     case SPACE:
 565     case RESERVE:
 566     case RELEASE:
 567     case ERASE:
 568     case ALLOW_MEDIUM_REMOVAL:
 569     case VERIFY_10:
 570     case SEEK_10:
 571     case SYNCHRONIZE_CACHE:
 572     case LOCK_UNLOCK_CACHE:
 573     case LOAD_UNLOAD:
 574     case SET_CD_SPEED:
 575     case SET_LIMITS:
 576     case WRITE_LONG_10:
 577     case MOVE_MEDIUM:
 578     case UPDATE_BLOCK:
 579         cmd->xfer = 0;
 580         break;
 581     case MODE_SENSE:
 582         break;
 583     case WRITE_SAME_10:
 584         cmd->xfer = 1;
 585         break;
 586     case READ_CAPACITY_10:
 587         cmd->xfer = 8;
 588         break;
 589     case READ_BLOCK_LIMITS:
 590         cmd->xfer = 6;
 591         break;
 592     case READ_POSITION:
 593         cmd->xfer = 20;
 594         break;
 595     case SEND_VOLUME_TAG:
 596         cmd->xfer *= 40;
 597         break;
 598     case MEDIUM_SCAN:
 599         cmd->xfer *= 8;
 600         break;
 601     case WRITE_10:
 602     case WRITE_VERIFY_10:
 603     case WRITE_6:
 604     case WRITE_12:
 605     case WRITE_VERIFY_12:
 606     case WRITE_16:
 607     case WRITE_VERIFY_16:
 608         cmd->xfer *= dev->blocksize;
 609         break;
 610     case READ_10:
 611     case READ_6:
 612     case READ_REVERSE:
 613     case RECOVER_BUFFERED_DATA:
 614     case READ_12:
 615     case READ_16:
 616         cmd->xfer *= dev->blocksize;
 617         break;
 618     case INQUIRY:
 619         cmd->xfer = buf[4] | (buf[3] << 8);
 620         break;
 621     case MAINTENANCE_OUT:
 622     case MAINTENANCE_IN:
 623         if (dev->type == TYPE_ROM) {
 624             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 625             cmd->xfer = buf[9] | (buf[8] << 8);
 626         }
 627         break;
 628     }
 629     return 0;
 630 }
 631
 632 static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 633 {
 634     switch (buf[0]) {
 635     /* stream commands */
 636     case READ_6:
 637     case READ_REVERSE:
 638     case RECOVER_BUFFERED_DATA:
 639     case WRITE_6:
 640         cmd->len = 6;
 641         cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16);
 642         if (buf[1] & 0x01) { /* fixed */
 643             cmd->xfer *= dev->blocksize;
 644         }
 645         break;
 646     case REWIND:
 647     case START_STOP:
 648         cmd->len = 6;
 649         cmd->xfer = 0;
 650         break;
 651     /* generic commands */
 652     default:
 653         return scsi_req_length(cmd, dev, buf);
 654     }
 655     return 0;
 656 }
 657
 658 static void scsi_cmd_xfer_mode(SCSICommand *cmd)
 659 {
 660     switch (cmd->buf[0]) {
 661     case WRITE_6:
 662     case WRITE_10:
 663     case WRITE_VERIFY_10:
 664     case WRITE_12:
 665     case WRITE_VERIFY_12:
 666     case WRITE_16:
 667     case WRITE_VERIFY_16:
 668     case COPY:
 669     case COPY_VERIFY:
 670     case COMPARE:
 671     case CHANGE_DEFINITION:
 672     case LOG_SELECT:
 673     case MODE_SELECT:
 674     case MODE_SELECT_10:
 675     case SEND_DIAGNOSTIC:
 676     case WRITE_BUFFER:
 677     case FORMAT_UNIT:
 678     case REASSIGN_BLOCKS:
 679     case SEARCH_EQUAL:
 680     case SEARCH_HIGH:
 681     case SEARCH_LOW:
 682     case UPDATE_BLOCK:
 683     case WRITE_LONG_10:
 684     case WRITE_SAME_10:
 685     case SEARCH_HIGH_12:
 686     case SEARCH_EQUAL_12:
 687     case SEARCH_LOW_12:
 688     case MEDIUM_SCAN:
 689     case SEND_VOLUME_TAG:
 690     case PERSISTENT_RESERVE_OUT:
 691     case MAINTENANCE_OUT:
 692         cmd->mode = SCSI_XFER_TO_DEV;
 693         break;
 694     default:
 695         if (cmd->xfer)
 696             cmd->mode = SCSI_XFER_FROM_DEV;
 697         else {
 698             cmd->mode = SCSI_XFER_NONE;
 699         }
 700         break;
 701     }
 702 }
 703
 704 static uint64_t scsi_cmd_lba(SCSICommand *cmd)
 705 {
 706     uint8_t *buf = cmd->buf;
 707     uint64_t lba;
 708
 709     switch (buf[0] >> 5) {
 710     case 0:
 711         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 712               (((uint64_t) buf[1] & 0x1f) << 16);
 713         break;
 714     case 1:
 715     case 2:
 716         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 717               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 718         break;
 719     case 4:
 720         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 721               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 722               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 723               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 724         break;
 725     case 5:
 726         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 727               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 728         break;
 729     default:
 730         lba = -1;
 731
 732     }
 733     return lba;
 734 }
 735
 736 int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 737 {
 738     int rc;
 739
 740     if (dev->type == TYPE_TAPE) {
 741         rc = scsi_req_stream_length(cmd, dev, buf);
 742     } else {
 743         rc = scsi_req_length(cmd, dev, buf);
 744     }
 745     if (rc != 0)
 746         return rc;
 747
 748     memcpy(cmd->buf, buf, cmd->len);
 749     scsi_cmd_xfer_mode(cmd);
 750     cmd->lba = scsi_cmd_lba(cmd);
 751     return 0;
 752 }
 753
 754 /*
 755  * Predefined sense codes
 756  */
 757
 758 /* No sense data available */
 759 const struct SCSISense sense_code_NO_SENSE = {
 760     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
 761 };
 762
 763 /* LUN not ready, Manual intervention required */
 764 const struct SCSISense sense_code_LUN_NOT_READY = {
 765     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
 766 };
 767
 768 /* LUN not ready, Medium not present */
 769 const struct SCSISense sense_code_NO_MEDIUM = {
 770     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
 771 };
 772
 773 /* Hardware error, internal target failure */
 774 const struct SCSISense sense_code_TARGET_FAILURE = {
 775     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
 776 };
 777
 778 /* Illegal request, invalid command operation code */
 779 const struct SCSISense sense_code_INVALID_OPCODE = {
 780     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
 781 };
 782
 783 /* Illegal request, LBA out of range */
 784 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
 785     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
 786 };
 787
 788 /* Illegal request, Invalid field in CDB */
 789 const struct SCSISense sense_code_INVALID_FIELD = {
 790     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
 791 };
 792
 793 /* Illegal request, LUN not supported */
 794 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
 795     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
 796 };
 797
 798 /* Illegal request, Saving parameters not supported */
 799 const struct SCSISense sense_code_SAVING_PARAMS_NOT_SUPPORTED = {
 800     .key = ILLEGAL_REQUEST, .asc = 0x39, .ascq = 0x00
 801 };
 802
 803 /* Illegal request, Incompatible medium installed */
 804 const struct SCSISense sense_code_INCOMPATIBLE_MEDIUM = {
 805     .key = ILLEGAL_REQUEST, .asc = 0x30, .ascq = 0x00
 806 };
 807
 808 /* Command aborted, I/O process terminated */
 809 const struct SCSISense sense_code_IO_ERROR = {
 810     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
 811 };
 812
 813 /* Command aborted, I_T Nexus loss occurred */
 814 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
 815     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
 816 };
 817
 818 /* Command aborted, Logical Unit failure */
 819 const struct SCSISense sense_code_LUN_FAILURE = {
 820     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
 821 };
 822
 823 /* Unit attention, Power on, reset or bus device reset occurred */
 824 const struct SCSISense sense_code_RESET = {
 825     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
 826 };
 827
 828 /* Unit attention, Medium may have changed */
 829 const struct SCSISense sense_code_MEDIUM_CHANGED = {
 830     .key = UNIT_ATTENTION, .asc = 0x28, .ascq = 0x00
 831 };
 832
 833 /* Unit attention, Reported LUNs data has changed */
 834 const struct SCSISense sense_code_REPORTED_LUNS_CHANGED = {
 835     .key = UNIT_ATTENTION, .asc = 0x3f, .ascq = 0x0e
 836 };
 837
 838 /* Unit attention, Device internal reset */
 839 const struct SCSISense sense_code_DEVICE_INTERNAL_RESET = {
 840     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x04
 841 };
 842
 843 /*
 844  * scsi_build_sense
 845  *
 846  * Convert between fixed and descriptor sense buffers
 847  */
 848 int scsi_build_sense(uint8_t *in_buf, int in_len,
 849                      uint8_t *buf, int len, bool fixed)
 850 {
 851     bool fixed_in;
 852     SCSISense sense;
 853     if (!fixed && len < 8) {
 854         return 0;
 855     }
 856
 857     if (in_len == 0) {
 858         sense.key = NO_SENSE;
 859         sense.asc = 0;
 860         sense.ascq = 0;
 861     } else {
 862         fixed_in = (in_buf[0] & 2) == 0;
 863
 864         if (fixed == fixed_in) {
 865             memcpy(buf, in_buf, MIN(len, in_len));
 866             return MIN(len, in_len);
 867         }
 868
 869         if (fixed_in) {
 870             sense.key = in_buf[2];
 871             sense.asc = in_buf[12];
 872             sense.ascq = in_buf[13];
 873         } else {
 874             sense.key = in_buf[1];
 875             sense.asc = in_buf[2];
 876             sense.ascq = in_buf[3];
 877         }
 878     }
 879
 880     memset(buf, 0, len);
 881     if (fixed) {
 882         /* Return fixed format sense buffer */
 883         buf[0] = 0xf0;
 884         buf[2] = sense.key;
 885         buf[7] = 7;
 886         buf[12] = sense.asc;
 887         buf[13] = sense.ascq;
 888         return MIN(len, 18);
 889     } else {
 890         /* Return descriptor format sense buffer */
 891         buf[0] = 0x72;
 892         buf[1] = sense.key;
 893         buf[2] = sense.asc;
 894         buf[3] = sense.ascq;
 895         return 8;
 896     }
 897 }
 898
 899 static const char *scsi_command_name(uint8_t cmd)
 900 {
 901     static const char *names[] = {
 902         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 903         [ REWIND                   ] = "REWIND",
 904         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 905         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 906         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 907         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
 908         [ READ_6                   ] = "READ_6",
 909         [ WRITE_6                  ] = "WRITE_6",
 910         [ SEEK_6                   ] = "SEEK_6",
 911         [ READ_REVERSE             ] = "READ_REVERSE",
 912         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 913         [ SPACE                    ] = "SPACE",
 914         [ INQUIRY                  ] = "INQUIRY",
 915         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 916         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 917         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 918         [ MODE_SELECT              ] = "MODE_SELECT",
 919         [ RESERVE                  ] = "RESERVE",
 920         [ RELEASE                  ] = "RELEASE",
 921         [ COPY                     ] = "COPY",
 922         [ ERASE                    ] = "ERASE",
 923         [ MODE_SENSE               ] = "MODE_SENSE",
 924         [ START_STOP               ] = "START_STOP",
 925         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 926         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 927         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 928         [ READ_CAPACITY_10         ] = "READ_CAPACITY_10",
 929         [ READ_10                  ] = "READ_10",
 930         [ WRITE_10                 ] = "WRITE_10",
 931         [ SEEK_10                  ] = "SEEK_10",
 932         [ WRITE_VERIFY_10          ] = "WRITE_VERIFY_10",
 933         [ VERIFY_10                ] = "VERIFY_10",
 934         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 935         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 936         [ SEARCH_LOW               ] = "SEARCH_LOW",
 937         [ SET_LIMITS               ] = "SET_LIMITS",
 938         [ PRE_FETCH                ] = "PRE_FETCH",
 939         /* READ_POSITION and PRE_FETCH use the same operation code */
 940         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 941         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 942         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
 943         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 944         [ COMPARE                  ] = "COMPARE",
 945         [ COPY_VERIFY              ] = "COPY_VERIFY",
 946         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 947         [ READ_BUFFER              ] = "READ_BUFFER",
 948         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 949         [ READ_LONG_10             ] = "READ_LONG_10",
 950         [ WRITE_LONG_10            ] = "WRITE_LONG_10",
 951         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 952         [ WRITE_SAME_10            ] = "WRITE_SAME_10",
 953         [ UNMAP                    ] = "UNMAP",
 954         [ READ_TOC                 ] = "READ_TOC",
 955         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 956         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 957         [ LOG_SELECT               ] = "LOG_SELECT",
 958         [ LOG_SENSE                ] = "LOG_SENSE",
 959         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 960         [ RESERVE_10               ] = "RESERVE_10",
 961         [ RELEASE_10               ] = "RELEASE_10",
 962         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 963         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 964         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 965         [ WRITE_FILEMARKS_16       ] = "WRITE_FILEMARKS_16",
 966         [ EXTENDED_COPY            ] = "EXTENDED_COPY",
 967         [ ATA_PASSTHROUGH          ] = "ATA_PASSTHROUGH",
 968         [ ACCESS_CONTROL_IN        ] = "ACCESS_CONTROL_IN",
 969         [ ACCESS_CONTROL_OUT       ] = "ACCESS_CONTROL_OUT",
 970         [ READ_16                  ] = "READ_16",
 971         [ COMPARE_AND_WRITE        ] = "COMPARE_AND_WRITE",
 972         [ WRITE_16                 ] = "WRITE_16",
 973         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 974         [ VERIFY_16                ] = "VERIFY_16",
 975         [ SYNCHRONIZE_CACHE_16     ] = "SYNCHRONIZE_CACHE_16",
 976         [ LOCATE_16                ] = "LOCATE_16",
 977         [ WRITE_SAME_16            ] = "WRITE_SAME_16",
 978         [ ERASE_16                 ] = "ERASE_16",
 979         [ SERVICE_ACTION_IN        ] = "SERVICE_ACTION_IN",
 980         [ WRITE_LONG_16            ] = "WRITE_LONG_16",
 981         [ REPORT_LUNS              ] = "REPORT_LUNS",
 982         [ BLANK                    ] = "BLANK",
 983         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 984         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 985         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 986         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
 987         [ READ_12                  ] = "READ_12",
 988         [ WRITE_12                 ] = "WRITE_12",
 989         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 990         [ VERIFY_12                ] = "VERIFY_12",
 991         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 992         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 993         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 994         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 995         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG",
 996         [ READ_DEFECT_DATA_12      ] = "READ_DEFECT_DATA_12",
 997         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 998     };
 999
1000     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
1001         return "*UNKNOWN*";
1002     return names[cmd];
1003 }
1004
1005 SCSIRequest *scsi_req_ref(SCSIRequest *req)
1006 {
1007     req->refcount++;
1008     return req;
1009 }
1010
1011 void scsi_req_unref(SCSIRequest *req)
1012 {
1013     if (--req->refcount == 0) {
1014         if (req->ops->free_req) {
1015             req->ops->free_req(req);
1016         }
1017         qemu_free(req);
1018     }
1019 }
1020
1021 /* Tell the device that we finished processing this chunk of I/O.  It
1022    will start the next chunk or complete the command.  */
1023 void scsi_req_continue(SCSIRequest *req)
1024 {
1025     trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
1026     if (req->cmd.mode == SCSI_XFER_TO_DEV) {
1027         req->ops->write_data(req);
1028     } else {
1029         req->ops->read_data(req);
1030     }
1031 }
1032
1033 /* Called by the devices when data is ready for the HBA.  The HBA should
1034    start a DMA operation to read or fill the device's data buffer.
1035    Once it completes, calling scsi_req_continue will restart I/O.  */
1036 void scsi_req_data(SCSIRequest *req, int len)
1037 {
1038     trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
1039     req->bus->ops->transfer_data(req, len);
1040 }
1041
1042 void scsi_req_print(SCSIRequest *req)
1043 {
1044     FILE *fp = stderr;
1045     int i;
1046
1047     fprintf(fp, "[%s id=%d] %s",
1048             req->dev->qdev.parent_bus->name,
1049             req->dev->id,
1050             scsi_command_name(req->cmd.buf[0]));
1051     for (i = 1; i < req->cmd.len; i++) {
1052         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
1053     }
1054     switch (req->cmd.mode) {
1055     case SCSI_XFER_NONE:
1056         fprintf(fp, " - none\n");
1057         break;
1058     case SCSI_XFER_FROM_DEV:
1059         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
1060         break;
1061     case SCSI_XFER_TO_DEV:
1062         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
1063         break;
1064     default:
1065         fprintf(fp, " - Oops\n");
1066         break;
1067     }
1068 }
1069
1070 void scsi_req_complete(SCSIRequest *req, int status)
1071 {
1072     assert(req->status == -1);
1073     req->status = status;
1074
1075     assert(req->sense_len < sizeof(req->sense));
1076     if (status == GOOD) {
1077         req->sense_len = 0;
1078     }
1079
1080     if (req->sense_len) {
1081         memcpy(req->dev->sense, req->sense, req->sense_len);
1082     }
1083     req->dev->sense_len = req->sense_len;
1084
1085     /*
1086      * Unit attention state is now stored in the device's sense buffer
1087      * if the HBA didn't do autosense.  Clear the pending unit attention
1088      * flags.
1089      */
1090     scsi_clear_unit_attention(req);
1091
1092     scsi_req_ref(req);
1093     scsi_req_dequeue(req);
1094     req->bus->ops->complete(req, req->status);
1095     scsi_req_unref(req);
1096 }
1097
1098 void scsi_req_cancel(SCSIRequest *req)
1099 {
1100     if (req->ops->cancel_io) {
1101         req->ops->cancel_io(req);
1102     }
1103     scsi_req_ref(req);
1104     scsi_req_dequeue(req);
1105     if (req->bus->ops->cancel) {
1106         req->bus->ops->cancel(req);
1107     }
1108     scsi_req_unref(req);
1109 }
1110
1111 void scsi_req_abort(SCSIRequest *req, int status)
1112 {
1113     if (req->ops->cancel_io) {
1114         req->ops->cancel_io(req);
1115     }
1116     scsi_req_complete(req, status);
1117 }
1118
1119 void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
1120 {
1121     SCSIRequest *req;
1122
1123     while (!QTAILQ_EMPTY(&sdev->requests)) {
1124         req = QTAILQ_FIRST(&sdev->requests);
1125         scsi_req_cancel(req);
1126     }
1127     sdev->unit_attention = sense;
1128 }
1129
1130 static char *scsibus_get_fw_dev_path(DeviceState *dev)
1131 {
1132     SCSIDevice *d = DO_UPCAST(SCSIDevice, qdev, dev);
1133     SCSIBus *bus = scsi_bus_from_device(d);
1134     char path[100];
1135     int i;
1136
1137     for (i = 0; i < bus->ndev; i++) {
1138         if (bus->devs[i] == d) {
1139             break;
1140         }
1141     }
1142
1143     assert(i != bus->ndev);
1144
1145     snprintf(path, sizeof(path), "%s@%x", qdev_fw_name(dev), i);
1146
1147     return strdup(path);
1148 }