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 #include "dma.h"
   9
  10 static char *scsibus_get_dev_path(DeviceState *dev);
  11 static char *scsibus_get_fw_dev_path(DeviceState *dev);
  12 static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
  13 static void scsi_req_dequeue(SCSIRequest *req);
  14
  15 static Property scsi_props[] = {
  16     DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
  17     DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  18     DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1),
  19     DEFINE_PROP_END_OF_LIST(),
  20 };
  21
  22 static void scsi_bus_class_init(ObjectClass *klass, void *data)
  23 {
  24     BusClass *k = BUS_CLASS(klass);
  25
  26     k->get_dev_path = scsibus_get_dev_path;
  27     k->get_fw_dev_path = scsibus_get_fw_dev_path;
  28 }
  29
  30 static const TypeInfo scsi_bus_info = {
  31     .name = TYPE_SCSI_BUS,
  32     .parent = TYPE_BUS,
  33     .instance_size = sizeof(SCSIBus),
  34     .class_init = scsi_bus_class_init,
  35 };
  36 static int next_scsi_bus;
  37
  38 static int scsi_device_init(SCSIDevice *s)
  39 {
  40     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
  41     if (sc->init) {
  42         return sc->init(s);
  43     }
  44     return 0;
  45 }
  46
  47 static void scsi_device_destroy(SCSIDevice *s)
  48 {
  49     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
  50     if (sc->destroy) {
  51         sc->destroy(s);
  52     }
  53 }
  54
  55 static SCSIRequest *scsi_device_alloc_req(SCSIDevice *s, uint32_t tag, uint32_t lun,
  56                                           uint8_t *buf, void *hba_private)
  57 {
  58     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
  59     if (sc->alloc_req) {
  60         return sc->alloc_req(s, tag, lun, buf, hba_private);
  61     }
  62
  63     return NULL;
  64 }
  65
  66 static void scsi_device_unit_attention_reported(SCSIDevice *s)
  67 {
  68     SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
  69     if (sc->unit_attention_reported) {
  70         sc->unit_attention_reported(s);
  71     }
  72 }
  73
  74 /* Create a scsi bus, and attach devices to it.  */
  75 void scsi_bus_new(SCSIBus *bus, DeviceState *host, const SCSIBusInfo *info)
  76 {
  77     qbus_create_inplace(&bus->qbus, TYPE_SCSI_BUS, host, NULL);
  78     bus->busnr = next_scsi_bus++;
  79     bus->info = info;
  80     bus->qbus.allow_hotplug = 1;
  81 }
  82
  83 static void scsi_dma_restart_bh(void *opaque)
  84 {
  85     SCSIDevice *s = opaque;
  86     SCSIRequest *req, *next;
  87
  88     qemu_bh_delete(s->bh);
  89     s->bh = NULL;
  90
  91     QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) {
  92         scsi_req_ref(req);
  93         if (req->retry) {
  94             req->retry = false;
  95             switch (req->cmd.mode) {
  96             case SCSI_XFER_FROM_DEV:
  97             case SCSI_XFER_TO_DEV:
  98                 scsi_req_continue(req);
  99                 break;
 100             case SCSI_XFER_NONE:
 101                 assert(!req->sg);
 102                 scsi_req_dequeue(req);
 103                 scsi_req_enqueue(req);
 104                 break;
 105             }
 106         }
 107         scsi_req_unref(req);
 108     }
 109 }
 110
 111 void scsi_req_retry(SCSIRequest *req)
 112 {
 113     /* No need to save a reference, because scsi_dma_restart_bh just
 114      * looks at the request list.  */
 115     req->retry = true;
 116 }
 117
 118 static void scsi_dma_restart_cb(void *opaque, int running, RunState state)
 119 {
 120     SCSIDevice *s = opaque;
 121
 122     if (!running) {
 123         return;
 124     }
 125     if (!s->bh) {
 126         s->bh = qemu_bh_new(scsi_dma_restart_bh, s);
 127         qemu_bh_schedule(s->bh);
 128     }
 129 }
 130
 131 static int scsi_qdev_init(DeviceState *qdev)
 132 {
 133     SCSIDevice *dev = SCSI_DEVICE(qdev);
 134     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
 135     SCSIDevice *d;
 136     int rc = -1;
 137
 138     if (dev->channel > bus->info->max_channel) {
 139         error_report("bad scsi channel id: %d", dev->channel);
 140         goto err;
 141     }
 142     if (dev->id != -1 && dev->id > bus->info->max_target) {
 143         error_report("bad scsi device id: %d", dev->id);
 144         goto err;
 145     }
 146     if (dev->lun != -1 && dev->lun > bus->info->max_lun) {
 147         error_report("bad scsi device lun: %d", dev->lun);
 148         goto err;
 149     }
 150
 151     if (dev->id == -1) {
 152         int id = -1;
 153         if (dev->lun == -1) {
 154             dev->lun = 0;
 155         }
 156         do {
 157             d = scsi_device_find(bus, dev->channel, ++id, dev->lun);
 158         } while (d && d->lun == dev->lun && id < bus->info->max_target);
 159         if (d && d->lun == dev->lun) {
 160             error_report("no free target");
 161             goto err;
 162         }
 163         dev->id = id;
 164     } else if (dev->lun == -1) {
 165         int lun = -1;
 166         do {
 167             d = scsi_device_find(bus, dev->channel, dev->id, ++lun);
 168         } while (d && d->lun == lun && lun < bus->info->max_lun);
 169         if (d && d->lun == lun) {
 170             error_report("no free lun");
 171             goto err;
 172         }
 173         dev->lun = lun;
 174     } else {
 175         d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
 176         assert(d);
 177         if (d->lun == dev->lun && dev != d) {
 178             qdev_free(&d->qdev);
 179         }
 180     }
 181
 182     QTAILQ_INIT(&dev->requests);
 183     rc = scsi_device_init(dev);
 184     if (rc == 0) {
 185         dev->vmsentry = qemu_add_vm_change_state_handler(scsi_dma_restart_cb,
 186                                                          dev);
 187     }
 188
 189 err:
 190     return rc;
 191 }
 192
 193 static int scsi_qdev_exit(DeviceState *qdev)
 194 {
 195     SCSIDevice *dev = SCSI_DEVICE(qdev);
 196
 197     if (dev->vmsentry) {
 198         qemu_del_vm_change_state_handler(dev->vmsentry);
 199     }
 200     scsi_device_destroy(dev);
 201     return 0;
 202 }
 203
 204 /* handle legacy '-drive if=scsi,...' cmd line args */
 205 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
 206                                       int unit, bool removable, int bootindex)
 207 {
 208     const char *driver;
 209     DeviceState *dev;
 210
 211     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
 212     dev = qdev_create(&bus->qbus, driver);
 213     qdev_prop_set_uint32(dev, "scsi-id", unit);
 214     if (bootindex >= 0) {
 215         qdev_prop_set_int32(dev, "bootindex", bootindex);
 216     }
 217     if (object_property_find(OBJECT(dev), "removable", NULL)) {
 218         qdev_prop_set_bit(dev, "removable", removable);
 219     }
 220     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
 221         qdev_free(dev);
 222         return NULL;
 223     }
 224     if (qdev_init(dev) < 0)
 225         return NULL;
 226     return SCSI_DEVICE(dev);
 227 }
 228
 229 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 230 {
 231     Location loc;
 232     DriveInfo *dinfo;
 233     int res = 0, unit;
 234
 235     loc_push_none(&loc);
 236     for (unit = 0; unit <= bus->info->max_target; unit++) {
 237         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 238         if (dinfo == NULL) {
 239             continue;
 240         }
 241         qemu_opts_loc_restore(dinfo->opts);
 242         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit, false, -1)) {
 243             res = -1;
 244             break;
 245         }
 246     }
 247     loc_pop(&loc);
 248     return res;
 249 }
 250
 251 static int32_t scsi_invalid_field(SCSIRequest *req, uint8_t *buf)
 252 {
 253     scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
 254     scsi_req_complete(req, CHECK_CONDITION);
 255     return 0;
 256 }
 257
 258 static const struct SCSIReqOps reqops_invalid_field = {
 259     .size         = sizeof(SCSIRequest),
 260     .send_command = scsi_invalid_field
 261 };
 262
 263 /* SCSIReqOps implementation for invalid commands.  */
 264
 265 static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf)
 266 {
 267     scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
 268     scsi_req_complete(req, CHECK_CONDITION);
 269     return 0;
 270 }
 271
 272 static const struct SCSIReqOps reqops_invalid_opcode = {
 273     .size         = sizeof(SCSIRequest),
 274     .send_command = scsi_invalid_command
 275 };
 276
 277 /* SCSIReqOps implementation for unit attention conditions.  */
 278
 279 static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf)
 280 {
 281     if (req->dev && req->dev->unit_attention.key == UNIT_ATTENTION) {
 282         scsi_req_build_sense(req, req->dev->unit_attention);
 283     } else if (req->bus->unit_attention.key == UNIT_ATTENTION) {
 284         scsi_req_build_sense(req, req->bus->unit_attention);
 285     }
 286     scsi_req_complete(req, CHECK_CONDITION);
 287     return 0;
 288 }
 289
 290 static const struct SCSIReqOps reqops_unit_attention = {
 291     .size         = sizeof(SCSIRequest),
 292     .send_command = scsi_unit_attention
 293 };
 294
 295 /* SCSIReqOps implementation for REPORT LUNS and for commands sent to
 296    an invalid LUN.  */
 297
 298 typedef struct SCSITargetReq SCSITargetReq;
 299
 300 struct SCSITargetReq {
 301     SCSIRequest req;
 302     int len;
 303     uint8_t buf[2056];
 304 };
 305
 306 static void store_lun(uint8_t *outbuf, int lun)
 307 {
 308     if (lun < 256) {
 309         outbuf[1] = lun;
 310         return;
 311     }
 312     outbuf[1] = (lun & 255);
 313     outbuf[0] = (lun >> 8) | 0x40;
 314 }
 315
 316 static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
 317 {
 318     BusChild *kid;
 319     int i, len, n;
 320     int channel, id;
 321     bool found_lun0;
 322
 323     if (r->req.cmd.xfer < 16) {
 324         return false;
 325     }
 326     if (r->req.cmd.buf[2] > 2) {
 327         return false;
 328     }
 329     channel = r->req.dev->channel;
 330     id = r->req.dev->id;
 331     found_lun0 = false;
 332     n = 0;
 333     QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
 334         DeviceState *qdev = kid->child;
 335         SCSIDevice *dev = SCSI_DEVICE(qdev);
 336
 337         if (dev->channel == channel && dev->id == id) {
 338             if (dev->lun == 0) {
 339                 found_lun0 = true;
 340             }
 341             n += 8;
 342         }
 343     }
 344     if (!found_lun0) {
 345         n += 8;
 346     }
 347     len = MIN(n + 8, r->req.cmd.xfer & ~7);
 348     if (len > sizeof(r->buf)) {
 349         /* TODO: > 256 LUNs? */
 350         return false;
 351     }
 352
 353     memset(r->buf, 0, len);
 354     stl_be_p(&r->buf, n);
 355     i = found_lun0 ? 8 : 16;
 356     QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
 357         DeviceState *qdev = kid->child;
 358         SCSIDevice *dev = SCSI_DEVICE(qdev);
 359
 360         if (dev->channel == channel && dev->id == id) {
 361             store_lun(&r->buf[i], dev->lun);
 362             i += 8;
 363         }
 364     }
 365     assert(i == n + 8);
 366     r->len = len;
 367     return true;
 368 }
 369
 370 static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
 371 {
 372     assert(r->req.dev->lun != r->req.lun);
 373     if (r->req.cmd.buf[1] & 0x2) {
 374         /* Command support data - optional, not implemented */
 375         return false;
 376     }
 377
 378     if (r->req.cmd.buf[1] & 0x1) {
 379         /* Vital product data */
 380         uint8_t page_code = r->req.cmd.buf[2];
 381         r->buf[r->len++] = page_code ; /* this page */
 382         r->buf[r->len++] = 0x00;
 383
 384         switch (page_code) {
 385         case 0x00: /* Supported page codes, mandatory */
 386         {
 387             int pages;
 388             pages = r->len++;
 389             r->buf[r->len++] = 0x00; /* list of supported pages (this page) */
 390             r->buf[pages] = r->len - pages - 1; /* number of pages */
 391             break;
 392         }
 393         default:
 394             return false;
 395         }
 396         /* done with EVPD */
 397         assert(r->len < sizeof(r->buf));
 398         r->len = MIN(r->req.cmd.xfer, r->len);
 399         return true;
 400     }
 401
 402     /* Standard INQUIRY data */
 403     if (r->req.cmd.buf[2] != 0) {
 404         return false;
 405     }
 406
 407     /* PAGE CODE == 0 */
 408     r->len = MIN(r->req.cmd.xfer, 36);
 409     memset(r->buf, 0, r->len);
 410     if (r->req.lun != 0) {
 411         r->buf[0] = TYPE_NO_LUN;
 412     } else {
 413         r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE;
 414         r->buf[2] = 5; /* Version */
 415         r->buf[3] = 2 | 0x10; /* HiSup, response data format */
 416         r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */
 417         r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ.  */
 418         memcpy(&r->buf[8], "QEMU    ", 8);
 419         memcpy(&r->buf[16], "QEMU TARGET     ", 16);
 420         pstrcpy((char *) &r->buf[32], 4, qemu_get_version());
 421     }
 422     return true;
 423 }
 424
 425 static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
 426 {
 427     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 428
 429     switch (buf[0]) {
 430     case REPORT_LUNS:
 431         if (!scsi_target_emulate_report_luns(r)) {
 432             goto illegal_request;
 433         }
 434         break;
 435     case INQUIRY:
 436         if (!scsi_target_emulate_inquiry(r)) {
 437             goto illegal_request;
 438         }
 439         break;
 440     case REQUEST_SENSE:
 441         r->len = scsi_device_get_sense(r->req.dev, r->buf,
 442                                        MIN(req->cmd.xfer, sizeof r->buf),
 443                                        (req->cmd.buf[1] & 1) == 0);
 444         if (r->req.dev->sense_is_ua) {
 445             scsi_device_unit_attention_reported(req->dev);
 446             r->req.dev->sense_len = 0;
 447             r->req.dev->sense_is_ua = false;
 448         }
 449         break;
 450     default:
 451         scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
 452         scsi_req_complete(req, CHECK_CONDITION);
 453         return 0;
 454     illegal_request:
 455         scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
 456         scsi_req_complete(req, CHECK_CONDITION);
 457         return 0;
 458     }
 459
 460     if (!r->len) {
 461         scsi_req_complete(req, GOOD);
 462     }
 463     return r->len;
 464 }
 465
 466 static void scsi_target_read_data(SCSIRequest *req)
 467 {
 468     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 469     uint32_t n;
 470
 471     n = r->len;
 472     if (n > 0) {
 473         r->len = 0;
 474         scsi_req_data(&r->req, n);
 475     } else {
 476         scsi_req_complete(&r->req, GOOD);
 477     }
 478 }
 479
 480 static uint8_t *scsi_target_get_buf(SCSIRequest *req)
 481 {
 482     SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
 483
 484     return r->buf;
 485 }
 486
 487 static const struct SCSIReqOps reqops_target_command = {
 488     .size         = sizeof(SCSITargetReq),
 489     .send_command = scsi_target_send_command,
 490     .read_data    = scsi_target_read_data,
 491     .get_buf      = scsi_target_get_buf,
 492 };
 493
 494
 495 SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
 496                             uint32_t tag, uint32_t lun, void *hba_private)
 497 {
 498     SCSIRequest *req;
 499
 500     req = g_malloc0(reqops->size);
 501     req->refcount = 1;
 502     req->bus = scsi_bus_from_device(d);
 503     req->dev = d;
 504     req->tag = tag;
 505     req->lun = lun;
 506     req->hba_private = hba_private;
 507     req->status = -1;
 508     req->sense_len = 0;
 509     req->ops = reqops;
 510     trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
 511     return req;
 512 }
 513
 514 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
 515                           uint8_t *buf, void *hba_private)
 516 {
 517     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus);
 518     SCSIRequest *req;
 519     SCSICommand cmd;
 520
 521     if (scsi_req_parse(&cmd, d, buf) != 0) {
 522         trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]);
 523         req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private);
 524     } else {
 525         trace_scsi_req_parsed(d->id, lun, tag, buf[0],
 526                               cmd.mode, cmd.xfer);
 527         if (cmd.lba != -1) {
 528             trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0],
 529                                       cmd.lba);
 530         }
 531
 532         if (cmd.xfer > INT32_MAX) {
 533             req = scsi_req_alloc(&reqops_invalid_field, d, tag, lun, hba_private);
 534         } else if ((d->unit_attention.key == UNIT_ATTENTION ||
 535                    bus->unit_attention.key == UNIT_ATTENTION) &&
 536                   (buf[0] != INQUIRY &&
 537                    buf[0] != REPORT_LUNS &&
 538                    buf[0] != GET_CONFIGURATION &&
 539                    buf[0] != GET_EVENT_STATUS_NOTIFICATION &&
 540
 541                    /*
 542                     * If we already have a pending unit attention condition,
 543                     * report this one before triggering another one.
 544                     */
 545                    !(buf[0] == REQUEST_SENSE && d->sense_is_ua))) {
 546             req = scsi_req_alloc(&reqops_unit_attention, d, tag, lun,
 547                                  hba_private);
 548         } else if (lun != d->lun ||
 549                    buf[0] == REPORT_LUNS ||
 550                    (buf[0] == REQUEST_SENSE && d->sense_len)) {
 551             req = scsi_req_alloc(&reqops_target_command, d, tag, lun,
 552                                  hba_private);
 553         } else {
 554             req = scsi_device_alloc_req(d, tag, lun, buf, hba_private);
 555         }
 556     }
 557
 558     req->cmd = cmd;
 559     req->resid = req->cmd.xfer;
 560
 561     switch (buf[0]) {
 562     case INQUIRY:
 563         trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]);
 564         break;
 565     case TEST_UNIT_READY:
 566         trace_scsi_test_unit_ready(d->id, lun, tag);
 567         break;
 568     case REPORT_LUNS:
 569         trace_scsi_report_luns(d->id, lun, tag);
 570         break;
 571     case REQUEST_SENSE:
 572         trace_scsi_request_sense(d->id, lun, tag);
 573         break;
 574     default:
 575         break;
 576     }
 577
 578     return req;
 579 }
 580
 581 uint8_t *scsi_req_get_buf(SCSIRequest *req)
 582 {
 583     return req->ops->get_buf(req);
 584 }
 585
 586 static void scsi_clear_unit_attention(SCSIRequest *req)
 587 {
 588     SCSISense *ua;
 589     if (req->dev->unit_attention.key != UNIT_ATTENTION &&
 590         req->bus->unit_attention.key != UNIT_ATTENTION) {
 591         return;
 592     }
 593
 594     /*
 595      * If an INQUIRY command enters the enabled command state,
 596      * the device server shall [not] clear any unit attention condition;
 597      * See also MMC-6, paragraphs 6.5 and 6.6.2.
 598      */
 599     if (req->cmd.buf[0] == INQUIRY ||
 600         req->cmd.buf[0] == GET_CONFIGURATION ||
 601         req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) {
 602         return;
 603     }
 604
 605     if (req->dev->unit_attention.key == UNIT_ATTENTION) {
 606         ua = &req->dev->unit_attention;
 607     } else {
 608         ua = &req->bus->unit_attention;
 609     }
 610
 611     /*
 612      * If a REPORT LUNS command enters the enabled command state, [...]
 613      * the device server shall clear any pending unit attention condition
 614      * with an additional sense code of REPORTED LUNS DATA HAS CHANGED.
 615      */
 616     if (req->cmd.buf[0] == REPORT_LUNS &&
 617         !(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
 618           ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) {
 619         return;
 620     }
 621
 622     *ua = SENSE_CODE(NO_SENSE);
 623 }
 624
 625 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
 626 {
 627     int ret;
 628
 629     assert(len >= 14);
 630     if (!req->sense_len) {
 631         return 0;
 632     }
 633
 634     ret = scsi_build_sense(req->sense, req->sense_len, buf, len, true);
 635
 636     /*
 637      * FIXME: clearing unit attention conditions upon autosense should be done
 638      * only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b
 639      * (SAM-5, 5.14).
 640      *
 641      * We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and
 642      * 10b for HBAs that do not support it (do not call scsi_req_get_sense).
 643      * Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b.
 644      */
 645     if (req->dev->sense_is_ua) {
 646         scsi_device_unit_attention_reported(req->dev);
 647         req->dev->sense_len = 0;
 648         req->dev->sense_is_ua = false;
 649     }
 650     return ret;
 651 }
 652
 653 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed)
 654 {
 655     return scsi_build_sense(dev->sense, dev->sense_len, buf, len, fixed);
 656 }
 657
 658 void scsi_req_build_sense(SCSIRequest *req, SCSISense sense)
 659 {
 660     trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag,
 661                                sense.key, sense.asc, sense.ascq);
 662     memset(req->sense, 0, 18);
 663     req->sense[0] = 0x70;
 664     req->sense[2] = sense.key;
 665     req->sense[7] = 10;
 666     req->sense[12] = sense.asc;
 667     req->sense[13] = sense.ascq;
 668     req->sense_len = 18;
 669 }
 670
 671 static void scsi_req_enqueue_internal(SCSIRequest *req)
 672 {
 673     assert(!req->enqueued);
 674     scsi_req_ref(req);
 675     if (req->bus->info->get_sg_list) {
 676         req->sg = req->bus->info->get_sg_list(req);
 677     } else {
 678         req->sg = NULL;
 679     }
 680     req->enqueued = true;
 681     QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
 682 }
 683
 684 int32_t scsi_req_enqueue(SCSIRequest *req)
 685 {
 686     int32_t rc;
 687
 688     assert(!req->retry);
 689     scsi_req_enqueue_internal(req);
 690     scsi_req_ref(req);
 691     rc = req->ops->send_command(req, req->cmd.buf);
 692     scsi_req_unref(req);
 693     return rc;
 694 }
 695
 696 static void scsi_req_dequeue(SCSIRequest *req)
 697 {
 698     trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
 699     req->retry = false;
 700     if (req->enqueued) {
 701         QTAILQ_REMOVE(&req->dev->requests, req, next);
 702         req->enqueued = false;
 703         scsi_req_unref(req);
 704     }
 705 }
 706
 707 static int scsi_get_performance_length(int num_desc, int type, int data_type)
 708 {
 709     /* MMC-6, paragraph 6.7.  */
 710     switch (type) {
 711     case 0:
 712         if ((data_type & 3) == 0) {
 713             /* Each descriptor is as in Table 295 - Nominal performance.  */
 714             return 16 * num_desc + 8;
 715         } else {
 716             /* Each descriptor is as in Table 296 - Exceptions.  */
 717             return 6 * num_desc + 8;
 718         }
 719     case 1:
 720     case 4:
 721     case 5:
 722         return 8 * num_desc + 8;
 723     case 2:
 724         return 2048 * num_desc + 8;
 725     case 3:
 726         return 16 * num_desc + 8;
 727     default:
 728         return 8;
 729     }
 730 }
 731
 732 static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 733 {
 734     switch (buf[0] >> 5) {
 735     case 0:
 736         cmd->xfer = buf[4];
 737         break;
 738     case 1:
 739     case 2:
 740         cmd->xfer = lduw_be_p(&buf[7]);
 741         break;
 742     case 4:
 743         cmd->xfer = ldl_be_p(&buf[10]) & 0xffffffffULL;
 744         break;
 745     case 5:
 746         cmd->xfer = ldl_be_p(&buf[6]) & 0xffffffffULL;
 747         break;
 748     default:
 749         return -1;
 750     }
 751
 752     switch (buf[0]) {
 753     case TEST_UNIT_READY:
 754     case REWIND:
 755     case START_STOP:
 756     case SET_CAPACITY:
 757     case WRITE_FILEMARKS:
 758     case WRITE_FILEMARKS_16:
 759     case SPACE:
 760     case RESERVE:
 761     case RELEASE:
 762     case ERASE:
 763     case ALLOW_MEDIUM_REMOVAL:
 764     case VERIFY_10:
 765     case SEEK_10:
 766     case SYNCHRONIZE_CACHE:
 767     case SYNCHRONIZE_CACHE_16:
 768     case LOCATE_16:
 769     case LOCK_UNLOCK_CACHE:
 770     case SET_CD_SPEED:
 771     case SET_LIMITS:
 772     case WRITE_LONG_10:
 773     case UPDATE_BLOCK:
 774     case RESERVE_TRACK:
 775     case SET_READ_AHEAD:
 776     case PRE_FETCH:
 777     case PRE_FETCH_16:
 778     case ALLOW_OVERWRITE:
 779         cmd->xfer = 0;
 780         break;
 781     case MODE_SENSE:
 782         break;
 783     case WRITE_SAME_10:
 784     case WRITE_SAME_16:
 785         cmd->xfer = dev->blocksize;
 786         break;
 787     case READ_CAPACITY_10:
 788         cmd->xfer = 8;
 789         break;
 790     case READ_BLOCK_LIMITS:
 791         cmd->xfer = 6;
 792         break;
 793     case SEND_VOLUME_TAG:
 794         /* GPCMD_SET_STREAMING from multimedia commands.  */
 795         if (dev->type == TYPE_ROM) {
 796             cmd->xfer = buf[10] | (buf[9] << 8);
 797         } else {
 798             cmd->xfer = buf[9] | (buf[8] << 8);
 799         }
 800         break;
 801     case WRITE_6:
 802         /* length 0 means 256 blocks */
 803         if (cmd->xfer == 0) {
 804             cmd->xfer = 256;
 805         }
 806     case WRITE_10:
 807     case WRITE_VERIFY_10:
 808     case WRITE_12:
 809     case WRITE_VERIFY_12:
 810     case WRITE_16:
 811     case WRITE_VERIFY_16:
 812         cmd->xfer *= dev->blocksize;
 813         break;
 814     case READ_6:
 815     case READ_REVERSE:
 816         /* length 0 means 256 blocks */
 817         if (cmd->xfer == 0) {
 818             cmd->xfer = 256;
 819         }
 820     case READ_10:
 821     case RECOVER_BUFFERED_DATA:
 822     case READ_12:
 823     case READ_16:
 824         cmd->xfer *= dev->blocksize;
 825         break;
 826     case FORMAT_UNIT:
 827         /* MMC mandates the parameter list to be 12-bytes long.  Parameters
 828          * for block devices are restricted to the header right now.  */
 829         if (dev->type == TYPE_ROM && (buf[1] & 16)) {
 830             cmd->xfer = 12;
 831         } else {
 832             cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4);
 833         }
 834         break;
 835     case INQUIRY:
 836     case RECEIVE_DIAGNOSTIC:
 837     case SEND_DIAGNOSTIC:
 838         cmd->xfer = buf[4] | (buf[3] << 8);
 839         break;
 840     case READ_CD:
 841     case READ_BUFFER:
 842     case WRITE_BUFFER:
 843     case SEND_CUE_SHEET:
 844         cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16);
 845         break;
 846     case PERSISTENT_RESERVE_OUT:
 847         cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL;
 848         break;
 849     case ERASE_12:
 850         if (dev->type == TYPE_ROM) {
 851             /* MMC command GET PERFORMANCE.  */
 852             cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8),
 853                                                     buf[10], buf[1] & 0x1f);
 854         }
 855         break;
 856     case MECHANISM_STATUS:
 857     case READ_DVD_STRUCTURE:
 858     case SEND_DVD_STRUCTURE:
 859     case MAINTENANCE_OUT:
 860     case MAINTENANCE_IN:
 861         if (dev->type == TYPE_ROM) {
 862             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 863             cmd->xfer = buf[9] | (buf[8] << 8);
 864         }
 865         break;
 866     }
 867     return 0;
 868 }
 869
 870 static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 871 {
 872     switch (buf[0]) {
 873     /* stream commands */
 874     case ERASE_12:
 875     case ERASE_16:
 876         cmd->xfer = 0;
 877         break;
 878     case READ_6:
 879     case READ_REVERSE:
 880     case RECOVER_BUFFERED_DATA:
 881     case WRITE_6:
 882         cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16);
 883         if (buf[1] & 0x01) { /* fixed */
 884             cmd->xfer *= dev->blocksize;
 885         }
 886         break;
 887     case READ_16:
 888     case READ_REVERSE_16:
 889     case VERIFY_16:
 890     case WRITE_16:
 891         cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16);
 892         if (buf[1] & 0x01) { /* fixed */
 893             cmd->xfer *= dev->blocksize;
 894         }
 895         break;
 896     case REWIND:
 897     case LOAD_UNLOAD:
 898         cmd->xfer = 0;
 899         break;
 900     case SPACE_16:
 901         cmd->xfer = buf[13] | (buf[12] << 8);
 902         break;
 903     case READ_POSITION:
 904         switch (buf[1] & 0x1f) /* operation code */ {
 905         case SHORT_FORM_BLOCK_ID:
 906         case SHORT_FORM_VENDOR_SPECIFIC:
 907             cmd->xfer = 20;
 908             break;
 909         case LONG_FORM:
 910             cmd->xfer = 32;
 911             break;
 912         case EXTENDED_FORM:
 913             cmd->xfer = buf[8] | (buf[7] << 8);
 914             break;
 915         default:
 916             return -1;
 917         }
 918
 919         break;
 920     case FORMAT_UNIT:
 921         cmd->xfer = buf[4] | (buf[3] << 8);
 922         break;
 923     /* generic commands */
 924     default:
 925         return scsi_req_length(cmd, dev, buf);
 926     }
 927     return 0;
 928 }
 929
 930 static int scsi_req_medium_changer_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
 931 {
 932     switch (buf[0]) {
 933     /* medium changer commands */
 934     case EXCHANGE_MEDIUM:
 935     case INITIALIZE_ELEMENT_STATUS:
 936     case INITIALIZE_ELEMENT_STATUS_WITH_RANGE:
 937     case MOVE_MEDIUM:
 938     case POSITION_TO_ELEMENT:
 939         cmd->xfer = 0;
 940         break;
 941     case READ_ELEMENT_STATUS:
 942         cmd->xfer = buf[9] | (buf[8] << 8) | (buf[7] << 16);
 943         break;
 944
 945     /* generic commands */
 946     default:
 947         return scsi_req_length(cmd, dev, buf);
 948     }
 949     return 0;
 950 }
 951
 952
 953 static void scsi_cmd_xfer_mode(SCSICommand *cmd)
 954 {
 955     if (!cmd->xfer) {
 956         cmd->mode = SCSI_XFER_NONE;
 957         return;
 958     }
 959     switch (cmd->buf[0]) {
 960     case WRITE_6:
 961     case WRITE_10:
 962     case WRITE_VERIFY_10:
 963     case WRITE_12:
 964     case WRITE_VERIFY_12:
 965     case WRITE_16:
 966     case WRITE_VERIFY_16:
 967     case COPY:
 968     case COPY_VERIFY:
 969     case COMPARE:
 970     case CHANGE_DEFINITION:
 971     case LOG_SELECT:
 972     case MODE_SELECT:
 973     case MODE_SELECT_10:
 974     case SEND_DIAGNOSTIC:
 975     case WRITE_BUFFER:
 976     case FORMAT_UNIT:
 977     case REASSIGN_BLOCKS:
 978     case SEARCH_EQUAL:
 979     case SEARCH_HIGH:
 980     case SEARCH_LOW:
 981     case UPDATE_BLOCK:
 982     case WRITE_LONG_10:
 983     case WRITE_SAME_10:
 984     case WRITE_SAME_16:
 985     case UNMAP:
 986     case SEARCH_HIGH_12:
 987     case SEARCH_EQUAL_12:
 988     case SEARCH_LOW_12:
 989     case MEDIUM_SCAN:
 990     case SEND_VOLUME_TAG:
 991     case SEND_CUE_SHEET:
 992     case SEND_DVD_STRUCTURE:
 993     case PERSISTENT_RESERVE_OUT:
 994     case MAINTENANCE_OUT:
 995     case ATA_PASSTHROUGH:
 996         cmd->mode = SCSI_XFER_TO_DEV;
 997         break;
 998     default:
 999         cmd->mode = SCSI_XFER_FROM_DEV;
1000         break;
1001     }
1002 }
1003
1004 static uint64_t scsi_cmd_lba(SCSICommand *cmd)
1005 {
1006     uint8_t *buf = cmd->buf;
1007     uint64_t lba;
1008
1009     switch (buf[0] >> 5) {
1010     case 0:
1011         lba = ldl_be_p(&buf[0]) & 0x1fffff;
1012         break;
1013     case 1:
1014     case 2:
1015     case 5:
1016         lba = ldl_be_p(&buf[2]) & 0xffffffffULL;
1017         break;
1018     case 4:
1019         lba = ldq_be_p(&buf[2]);
1020         break;
1021     default:
1022         lba = -1;
1023
1024     }
1025     return lba;
1026 }
1027
1028 int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
1029 {
1030     int rc;
1031
1032     switch (buf[0] >> 5) {
1033     case 0:
1034         cmd->len = 6;
1035         break;
1036     case 1:
1037     case 2:
1038         cmd->len = 10;
1039         break;
1040     case 4:
1041         cmd->len = 16;
1042         break;
1043     case 5:
1044         cmd->len = 12;
1045         break;
1046     default:
1047         return -1;
1048     }
1049
1050     switch (dev->type) {
1051     case TYPE_TAPE:
1052         rc = scsi_req_stream_length(cmd, dev, buf);
1053         break;
1054     case TYPE_MEDIUM_CHANGER:
1055         rc = scsi_req_medium_changer_length(cmd, dev, buf);
1056         break;
1057     default:
1058         rc = scsi_req_length(cmd, dev, buf);
1059         break;
1060     }
1061
1062     if (rc != 0)
1063         return rc;
1064
1065     memcpy(cmd->buf, buf, cmd->len);
1066     scsi_cmd_xfer_mode(cmd);
1067     cmd->lba = scsi_cmd_lba(cmd);
1068     return 0;
1069 }
1070
1071 /*
1072  * Predefined sense codes
1073  */
1074
1075 /* No sense data available */
1076 const struct SCSISense sense_code_NO_SENSE = {
1077     .key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
1078 };
1079
1080 /* LUN not ready, Manual intervention required */
1081 const struct SCSISense sense_code_LUN_NOT_READY = {
1082     .key = NOT_READY, .asc = 0x04, .ascq = 0x03
1083 };
1084
1085 /* LUN not ready, Medium not present */
1086 const struct SCSISense sense_code_NO_MEDIUM = {
1087     .key = NOT_READY, .asc = 0x3a, .ascq = 0x00
1088 };
1089
1090 /* LUN not ready, medium removal prevented */
1091 const struct SCSISense sense_code_NOT_READY_REMOVAL_PREVENTED = {
1092     .key = NOT_READY, .asc = 0x53, .ascq = 0x00
1093 };
1094
1095 /* Hardware error, internal target failure */
1096 const struct SCSISense sense_code_TARGET_FAILURE = {
1097     .key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
1098 };
1099
1100 /* Illegal request, invalid command operation code */
1101 const struct SCSISense sense_code_INVALID_OPCODE = {
1102     .key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
1103 };
1104
1105 /* Illegal request, LBA out of range */
1106 const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
1107     .key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
1108 };
1109
1110 /* Illegal request, Invalid field in CDB */
1111 const struct SCSISense sense_code_INVALID_FIELD = {
1112     .key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
1113 };
1114
1115 /* Illegal request, LUN not supported */
1116 const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
1117     .key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
1118 };
1119
1120 /* Illegal request, Saving parameters not supported */
1121 const struct SCSISense sense_code_SAVING_PARAMS_NOT_SUPPORTED = {
1122     .key = ILLEGAL_REQUEST, .asc = 0x39, .ascq = 0x00
1123 };
1124
1125 /* Illegal request, Incompatible medium installed */
1126 const struct SCSISense sense_code_INCOMPATIBLE_FORMAT = {
1127     .key = ILLEGAL_REQUEST, .asc = 0x30, .ascq = 0x00
1128 };
1129
1130 /* Illegal request, medium removal prevented */
1131 const struct SCSISense sense_code_ILLEGAL_REQ_REMOVAL_PREVENTED = {
1132     .key = ILLEGAL_REQUEST, .asc = 0x53, .ascq = 0x00
1133 };
1134
1135 /* Command aborted, I/O process terminated */
1136 const struct SCSISense sense_code_IO_ERROR = {
1137     .key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
1138 };
1139
1140 /* Command aborted, I_T Nexus loss occurred */
1141 const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
1142     .key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
1143 };
1144
1145 /* Command aborted, Logical Unit failure */
1146 const struct SCSISense sense_code_LUN_FAILURE = {
1147     .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
1148 };
1149
1150 /* Unit attention, Power on, reset or bus device reset occurred */
1151 const struct SCSISense sense_code_RESET = {
1152     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
1153 };
1154
1155 /* Unit attention, No medium */
1156 const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM = {
1157     .key = UNIT_ATTENTION, .asc = 0x3a, .ascq = 0x00
1158 };
1159
1160 /* Unit attention, Medium may have changed */
1161 const struct SCSISense sense_code_MEDIUM_CHANGED = {
1162     .key = UNIT_ATTENTION, .asc = 0x28, .ascq = 0x00
1163 };
1164
1165 /* Unit attention, Reported LUNs data has changed */
1166 const struct SCSISense sense_code_REPORTED_LUNS_CHANGED = {
1167     .key = UNIT_ATTENTION, .asc = 0x3f, .ascq = 0x0e
1168 };
1169
1170 /* Unit attention, Device internal reset */
1171 const struct SCSISense sense_code_DEVICE_INTERNAL_RESET = {
1172     .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x04
1173 };
1174
1175 /*
1176  * scsi_build_sense
1177  *
1178  * Convert between fixed and descriptor sense buffers
1179  */
1180 int scsi_build_sense(uint8_t *in_buf, int in_len,
1181                      uint8_t *buf, int len, bool fixed)
1182 {
1183     bool fixed_in;
1184     SCSISense sense;
1185     if (!fixed && len < 8) {
1186         return 0;
1187     }
1188
1189     if (in_len == 0) {
1190         sense.key = NO_SENSE;
1191         sense.asc = 0;
1192         sense.ascq = 0;
1193     } else {
1194         fixed_in = (in_buf[0] & 2) == 0;
1195
1196         if (fixed == fixed_in) {
1197             memcpy(buf, in_buf, MIN(len, in_len));
1198             return MIN(len, in_len);
1199         }
1200
1201         if (fixed_in) {
1202             sense.key = in_buf[2];
1203             sense.asc = in_buf[12];
1204             sense.ascq = in_buf[13];
1205         } else {
1206             sense.key = in_buf[1];
1207             sense.asc = in_buf[2];
1208             sense.ascq = in_buf[3];
1209         }
1210     }
1211
1212     memset(buf, 0, len);
1213     if (fixed) {
1214         /* Return fixed format sense buffer */
1215         buf[0] = 0x70;
1216         buf[2] = sense.key;
1217         buf[7] = 10;
1218         buf[12] = sense.asc;
1219         buf[13] = sense.ascq;
1220         return MIN(len, 18);
1221     } else {
1222         /* Return descriptor format sense buffer */
1223         buf[0] = 0x72;
1224         buf[1] = sense.key;
1225         buf[2] = sense.asc;
1226         buf[3] = sense.ascq;
1227         return 8;
1228     }
1229 }
1230
1231 static const char *scsi_command_name(uint8_t cmd)
1232 {
1233     static const char *names[] = {
1234         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
1235         [ REWIND                   ] = "REWIND",
1236         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
1237         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
1238         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
1239         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS/INITIALIZE ELEMENT STATUS",
1240         /* LOAD_UNLOAD and INITIALIZE_ELEMENT_STATUS use the same operation code */
1241         [ READ_6                   ] = "READ_6",
1242         [ WRITE_6                  ] = "WRITE_6",
1243         [ SET_CAPACITY             ] = "SET_CAPACITY",
1244         [ READ_REVERSE             ] = "READ_REVERSE",
1245         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
1246         [ SPACE                    ] = "SPACE",
1247         [ INQUIRY                  ] = "INQUIRY",
1248         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
1249         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
1250         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
1251         [ MODE_SELECT              ] = "MODE_SELECT",
1252         [ RESERVE                  ] = "RESERVE",
1253         [ RELEASE                  ] = "RELEASE",
1254         [ COPY                     ] = "COPY",
1255         [ ERASE                    ] = "ERASE",
1256         [ MODE_SENSE               ] = "MODE_SENSE",
1257         [ START_STOP               ] = "START_STOP/LOAD_UNLOAD",
1258         /* LOAD_UNLOAD and START_STOP use the same operation code */
1259         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
1260         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
1261         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
1262         [ READ_CAPACITY_10         ] = "READ_CAPACITY_10",
1263         [ READ_10                  ] = "READ_10",
1264         [ WRITE_10                 ] = "WRITE_10",
1265         [ SEEK_10                  ] = "SEEK_10/POSITION_TO_ELEMENT",
1266         /* SEEK_10 and POSITION_TO_ELEMENT use the same operation code */
1267         [ WRITE_VERIFY_10          ] = "WRITE_VERIFY_10",
1268         [ VERIFY_10                ] = "VERIFY_10",
1269         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
1270         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
1271         [ SEARCH_LOW               ] = "SEARCH_LOW",
1272         [ SET_LIMITS               ] = "SET_LIMITS",
1273         [ PRE_FETCH                ] = "PRE_FETCH/READ_POSITION",
1274         /* READ_POSITION and PRE_FETCH use the same operation code */
1275         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
1276         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
1277         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA/INITIALIZE_ELEMENT_STATUS_WITH_RANGE",
1278         /* READ_DEFECT_DATA and INITIALIZE_ELEMENT_STATUS_WITH_RANGE use the same operation code */
1279         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
1280         [ COMPARE                  ] = "COMPARE",
1281         [ COPY_VERIFY              ] = "COPY_VERIFY",
1282         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
1283         [ READ_BUFFER              ] = "READ_BUFFER",
1284         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
1285         [ READ_LONG_10             ] = "READ_LONG_10",
1286         [ WRITE_LONG_10            ] = "WRITE_LONG_10",
1287         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
1288         [ WRITE_SAME_10            ] = "WRITE_SAME_10",
1289         [ UNMAP                    ] = "UNMAP",
1290         [ READ_TOC                 ] = "READ_TOC",
1291         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
1292         [ SANITIZE                 ] = "SANITIZE",
1293         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
1294         [ LOG_SELECT               ] = "LOG_SELECT",
1295         [ LOG_SENSE                ] = "LOG_SENSE",
1296         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
1297         [ RESERVE_10               ] = "RESERVE_10",
1298         [ RELEASE_10               ] = "RELEASE_10",
1299         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
1300         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
1301         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
1302         [ WRITE_FILEMARKS_16       ] = "WRITE_FILEMARKS_16",
1303         [ EXTENDED_COPY            ] = "EXTENDED_COPY",
1304         [ ATA_PASSTHROUGH          ] = "ATA_PASSTHROUGH",
1305         [ ACCESS_CONTROL_IN        ] = "ACCESS_CONTROL_IN",
1306         [ ACCESS_CONTROL_OUT       ] = "ACCESS_CONTROL_OUT",
1307         [ READ_16                  ] = "READ_16",
1308         [ COMPARE_AND_WRITE        ] = "COMPARE_AND_WRITE",
1309         [ WRITE_16                 ] = "WRITE_16",
1310         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
1311         [ VERIFY_16                ] = "VERIFY_16",
1312         [ PRE_FETCH_16             ] = "PRE_FETCH_16",
1313         [ SYNCHRONIZE_CACHE_16     ] = "SPACE_16/SYNCHRONIZE_CACHE_16",
1314         /* SPACE_16 and SYNCHRONIZE_CACHE_16 use the same operation code */
1315         [ LOCATE_16                ] = "LOCATE_16",
1316         [ WRITE_SAME_16            ] = "ERASE_16/WRITE_SAME_16",
1317         /* ERASE_16 and WRITE_SAME_16 use the same operation code */
1318         [ SERVICE_ACTION_IN_16     ] = "SERVICE_ACTION_IN_16",
1319         [ WRITE_LONG_16            ] = "WRITE_LONG_16",
1320         [ REPORT_LUNS              ] = "REPORT_LUNS",
1321         [ BLANK                    ] = "BLANK",
1322         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
1323         [ EXCHANGE_MEDIUM          ] = "EXCHANGE MEDIUM",
1324         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
1325         [ READ_12                  ] = "READ_12",
1326         [ WRITE_12                 ] = "WRITE_12",
1327         [ ERASE_12                 ] = "ERASE_12/GET_PERFORMANCE",
1328         /* ERASE_12 and GET_PERFORMANCE use the same operation code */
1329         [ SERVICE_ACTION_IN_12     ] = "SERVICE_ACTION_IN_12",
1330         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
1331         [ VERIFY_12                ] = "VERIFY_12",
1332         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
1333         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
1334         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
1335         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
1336         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG/SET_STREAMING",
1337         /* SEND_VOLUME_TAG and SET_STREAMING use the same operation code */
1338         [ READ_CD                  ] = "READ_CD",
1339         [ READ_DEFECT_DATA_12      ] = "READ_DEFECT_DATA_12",
1340         [ READ_DVD_STRUCTURE       ] = "READ_DVD_STRUCTURE",
1341         [ RESERVE_TRACK            ] = "RESERVE_TRACK",
1342         [ SEND_CUE_SHEET           ] = "SEND_CUE_SHEET",
1343         [ SEND_DVD_STRUCTURE       ] = "SEND_DVD_STRUCTURE",
1344         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
1345         [ SET_READ_AHEAD           ] = "SET_READ_AHEAD",
1346         [ ALLOW_OVERWRITE          ] = "ALLOW_OVERWRITE",
1347         [ MECHANISM_STATUS         ] = "MECHANISM_STATUS",
1348     };
1349
1350     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
1351         return "*UNKNOWN*";
1352     return names[cmd];
1353 }
1354
1355 SCSIRequest *scsi_req_ref(SCSIRequest *req)
1356 {
1357     assert(req->refcount > 0);
1358     req->refcount++;
1359     return req;
1360 }
1361
1362 void scsi_req_unref(SCSIRequest *req)
1363 {
1364     assert(req->refcount > 0);
1365     if (--req->refcount == 0) {
1366         SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, req->dev->qdev.parent_bus);
1367         if (bus->info->free_request && req->hba_private) {
1368             bus->info->free_request(bus, req->hba_private);
1369         }
1370         if (req->ops->free_req) {
1371             req->ops->free_req(req);
1372         }
1373         g_free(req);
1374     }
1375 }
1376
1377 /* Tell the device that we finished processing this chunk of I/O.  It
1378    will start the next chunk or complete the command.  */
1379 void scsi_req_continue(SCSIRequest *req)
1380 {
1381     trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
1382     if (req->cmd.mode == SCSI_XFER_TO_DEV) {
1383         req->ops->write_data(req);
1384     } else {
1385         req->ops->read_data(req);
1386     }
1387 }
1388
1389 /* Called by the devices when data is ready for the HBA.  The HBA should
1390    start a DMA operation to read or fill the device's data buffer.
1391    Once it completes, calling scsi_req_continue will restart I/O.  */
1392 void scsi_req_data(SCSIRequest *req, int len)
1393 {
1394     uint8_t *buf;
1395     if (req->io_canceled) {
1396         trace_scsi_req_data_canceled(req->dev->id, req->lun, req->tag, len);
1397         return;
1398     }
1399     trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
1400     assert(req->cmd.mode != SCSI_XFER_NONE);
1401     if (!req->sg) {
1402         req->resid -= len;
1403         req->bus->info->transfer_data(req, len);
1404         return;
1405     }
1406
1407     /* If the device calls scsi_req_data and the HBA specified a
1408      * scatter/gather list, the transfer has to happen in a single
1409      * step.  */
1410     assert(!req->dma_started);
1411     req->dma_started = true;
1412
1413     buf = scsi_req_get_buf(req);
1414     if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
1415         req->resid = dma_buf_read(buf, len, req->sg);
1416     } else {
1417         req->resid = dma_buf_write(buf, len, req->sg);
1418     }
1419     scsi_req_continue(req);
1420 }
1421
1422 void scsi_req_print(SCSIRequest *req)
1423 {
1424     FILE *fp = stderr;
1425     int i;
1426
1427     fprintf(fp, "[%s id=%d] %s",
1428             req->dev->qdev.parent_bus->name,
1429             req->dev->id,
1430             scsi_command_name(req->cmd.buf[0]));
1431     for (i = 1; i < req->cmd.len; i++) {
1432         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
1433     }
1434     switch (req->cmd.mode) {
1435     case SCSI_XFER_NONE:
1436         fprintf(fp, " - none\n");
1437         break;
1438     case SCSI_XFER_FROM_DEV:
1439         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
1440         break;
1441     case SCSI_XFER_TO_DEV:
1442         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
1443         break;
1444     default:
1445         fprintf(fp, " - Oops\n");
1446         break;
1447     }
1448 }
1449
1450 void scsi_req_complete(SCSIRequest *req, int status)
1451 {
1452     assert(req->status == -1);
1453     req->status = status;
1454
1455     assert(req->sense_len <= sizeof(req->sense));
1456     if (status == GOOD) {
1457         req->sense_len = 0;
1458     }
1459
1460     if (req->sense_len) {
1461         memcpy(req->dev->sense, req->sense, req->sense_len);
1462         req->dev->sense_len = req->sense_len;
1463         req->dev->sense_is_ua = (req->ops == &reqops_unit_attention);
1464     } else {
1465         req->dev->sense_len = 0;
1466         req->dev->sense_is_ua = false;
1467     }
1468
1469     /*
1470      * Unit attention state is now stored in the device's sense buffer
1471      * if the HBA didn't do autosense.  Clear the pending unit attention
1472      * flags.
1473      */
1474     scsi_clear_unit_attention(req);
1475
1476     scsi_req_ref(req);
1477     scsi_req_dequeue(req);
1478     req->bus->info->complete(req, req->status, req->resid);
1479     scsi_req_unref(req);
1480 }
1481
1482 void scsi_req_cancel(SCSIRequest *req)
1483 {
1484     if (!req->enqueued) {
1485         return;
1486     }
1487     scsi_req_ref(req);
1488     scsi_req_dequeue(req);
1489     req->io_canceled = true;
1490     if (req->ops->cancel_io) {
1491         req->ops->cancel_io(req);
1492     }
1493     if (req->bus->info->cancel) {
1494         req->bus->info->cancel(req);
1495     }
1496     scsi_req_unref(req);
1497 }
1498
1499 void scsi_req_abort(SCSIRequest *req, int status)
1500 {
1501     if (!req->enqueued) {
1502         return;
1503     }
1504     scsi_req_ref(req);
1505     scsi_req_dequeue(req);
1506     req->io_canceled = true;
1507     if (req->ops->cancel_io) {
1508         req->ops->cancel_io(req);
1509     }
1510     scsi_req_complete(req, status);
1511     scsi_req_unref(req);
1512 }
1513
1514 void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
1515 {
1516     SCSIRequest *req;
1517
1518     while (!QTAILQ_EMPTY(&sdev->requests)) {
1519         req = QTAILQ_FIRST(&sdev->requests);
1520         scsi_req_cancel(req);
1521     }
1522     sdev->unit_attention = sense;
1523 }
1524
1525 static char *scsibus_get_dev_path(DeviceState *dev)
1526 {
1527     SCSIDevice *d = DO_UPCAST(SCSIDevice, qdev, dev);
1528     DeviceState *hba = dev->parent_bus->parent;
1529     char *id;
1530     char *path;
1531
1532     id = qdev_get_dev_path(hba);
1533     if (id) {
1534         path = g_strdup_printf("%s/%d:%d:%d", id, d->channel, d->id, d->lun);
1535     } else {
1536         path = g_strdup_printf("%d:%d:%d", d->channel, d->id, d->lun);
1537     }
1538     g_free(id);
1539     return path;
1540 }
1541
1542 static char *scsibus_get_fw_dev_path(DeviceState *dev)
1543 {
1544     SCSIDevice *d = SCSI_DEVICE(dev);
1545     char path[100];
1546
1547     snprintf(path, sizeof(path), "channel@%x/%s@%x,%x", d->channel,
1548              qdev_fw_name(dev), d->id, d->lun);
1549
1550     return strdup(path);
1551 }
1552
1553 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
1554 {
1555     BusChild *kid;
1556     SCSIDevice *target_dev = NULL;
1557
1558     QTAILQ_FOREACH_REVERSE(kid, &bus->qbus.children, ChildrenHead, sibling) {
1559         DeviceState *qdev = kid->child;
1560         SCSIDevice *dev = SCSI_DEVICE(qdev);
1561
1562         if (dev->channel == channel && dev->id == id) {
1563             if (dev->lun == lun) {
1564                 return dev;
1565             }
1566             target_dev = dev;
1567         }
1568     }
1569     return target_dev;
1570 }
1571
1572 /* SCSI request list.  For simplicity, pv points to the whole device */
1573
1574 static void put_scsi_requests(QEMUFile *f, void *pv, size_t size)
1575 {
1576     SCSIDevice *s = pv;
1577     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
1578     SCSIRequest *req;
1579
1580     QTAILQ_FOREACH(req, &s->requests, next) {
1581         assert(!req->io_canceled);
1582         assert(req->status == -1);
1583         assert(req->enqueued);
1584
1585         qemu_put_sbyte(f, req->retry ? 1 : 2);
1586         qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf));
1587         qemu_put_be32s(f, &req->tag);
1588         qemu_put_be32s(f, &req->lun);
1589         if (bus->info->save_request) {
1590             bus->info->save_request(f, req);
1591         }
1592         if (req->ops->save_request) {
1593             req->ops->save_request(f, req);
1594         }
1595     }
1596     qemu_put_sbyte(f, 0);
1597 }
1598
1599 static int get_scsi_requests(QEMUFile *f, void *pv, size_t size)
1600 {
1601     SCSIDevice *s = pv;
1602     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
1603     int8_t sbyte;
1604
1605     while ((sbyte = qemu_get_sbyte(f)) > 0) {
1606         uint8_t buf[SCSI_CMD_BUF_SIZE];
1607         uint32_t tag;
1608         uint32_t lun;
1609         SCSIRequest *req;
1610
1611         qemu_get_buffer(f, buf, sizeof(buf));
1612         qemu_get_be32s(f, &tag);
1613         qemu_get_be32s(f, &lun);
1614         req = scsi_req_new(s, tag, lun, buf, NULL);
1615         req->retry = (sbyte == 1);
1616         if (bus->info->load_request) {
1617             req->hba_private = bus->info->load_request(f, req);
1618         }
1619         if (req->ops->load_request) {
1620             req->ops->load_request(f, req);
1621         }
1622
1623         /* Just restart it later.  */
1624         scsi_req_enqueue_internal(req);
1625
1626         /* At this point, the request will be kept alive by the reference
1627          * added by scsi_req_enqueue_internal, so we can release our reference.
1628          * The HBA of course will add its own reference in the load_request
1629          * callback if it needs to hold on the SCSIRequest.
1630          */
1631         scsi_req_unref(req);
1632     }
1633
1634     return 0;
1635 }
1636
1637 static const VMStateInfo vmstate_info_scsi_requests = {
1638     .name = "scsi-requests",
1639     .get  = get_scsi_requests,
1640     .put  = put_scsi_requests,
1641 };
1642
1643 const VMStateDescription vmstate_scsi_device = {
1644     .name = "SCSIDevice",
1645     .version_id = 1,
1646     .minimum_version_id = 1,
1647     .minimum_version_id_old = 1,
1648     .fields = (VMStateField[]) {
1649         VMSTATE_UINT8(unit_attention.key, SCSIDevice),
1650         VMSTATE_UINT8(unit_attention.asc, SCSIDevice),
1651         VMSTATE_UINT8(unit_attention.ascq, SCSIDevice),
1652         VMSTATE_BOOL(sense_is_ua, SCSIDevice),
1653         VMSTATE_UINT8_ARRAY(sense, SCSIDevice, SCSI_SENSE_BUF_SIZE),
1654         VMSTATE_UINT32(sense_len, SCSIDevice),
1655         {
1656             .name         = "requests",
1657             .version_id   = 0,
1658             .field_exists = NULL,
1659             .size         = 0,   /* ouch */
1660             .info         = &vmstate_info_scsi_requests,
1661             .flags        = VMS_SINGLE,
1662             .offset       = 0,
1663         },
1664         VMSTATE_END_OF_LIST()
1665     }
1666 };
1667
1668 static void scsi_device_class_init(ObjectClass *klass, void *data)
1669 {
1670     DeviceClass *k = DEVICE_CLASS(klass);
1671     k->bus_type = TYPE_SCSI_BUS;
1672     k->init     = scsi_qdev_init;
1673     k->unplug   = qdev_simple_unplug_cb;
1674     k->exit     = scsi_qdev_exit;
1675     k->props    = scsi_props;
1676 }
1677
1678 static TypeInfo scsi_device_type_info = {
1679     .name = TYPE_SCSI_DEVICE,
1680     .parent = TYPE_DEVICE,
1681     .instance_size = sizeof(SCSIDevice),
1682     .abstract = true,
1683     .class_size = sizeof(SCSIDeviceClass),
1684     .class_init = scsi_device_class_init,
1685 };
1686
1687 static void scsi_register_types(void)
1688 {
1689     type_register_static(&scsi_bus_info);
1690     type_register_static(&scsi_device_type_info);
1691 }
1692
1693 type_init(scsi_register_types)