1 #include "qemu/osdep.h" 2 #include "hw/hw.h" 3 #include "qapi/error.h" 4 #include "qemu/error-report.h" 5 #include "qemu/option.h" 6 #include "hw/scsi/scsi.h" 7 #include "scsi/constants.h" 8 #include "hw/qdev.h" 9 #include "sysemu/block-backend.h" 10 #include "sysemu/blockdev.h" 11 #include "trace.h" 12 #include "sysemu/dma.h" 13 #include "qemu/cutils.h" 14 15 static char *scsibus_get_dev_path(DeviceState *dev); 16 static char *scsibus_get_fw_dev_path(DeviceState *dev); 17 static void scsi_req_dequeue(SCSIRequest *req); 18 static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len); 19 static void scsi_target_free_buf(SCSIRequest *req); 20 21 static Property scsi_props[] = { 22 DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0), 23 DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1), 24 DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1), 25 DEFINE_PROP_END_OF_LIST(), 26 }; 27 28 static void scsi_bus_class_init(ObjectClass *klass, void *data) 29 { 30 BusClass *k = BUS_CLASS(klass); 31 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 32 33 k->get_dev_path = scsibus_get_dev_path; 34 k->get_fw_dev_path = scsibus_get_fw_dev_path; 35 hc->unplug = qdev_simple_device_unplug_cb; 36 } 37 38 static const TypeInfo scsi_bus_info = { 39 .name = TYPE_SCSI_BUS, 40 .parent = TYPE_BUS, 41 .instance_size = sizeof(SCSIBus), 42 .class_init = scsi_bus_class_init, 43 .interfaces = (InterfaceInfo[]) { 44 { TYPE_HOTPLUG_HANDLER }, 45 { } 46 } 47 }; 48 static int next_scsi_bus; 49 50 static void scsi_device_realize(SCSIDevice *s, Error **errp) 51 { 52 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 53 if (sc->realize) { 54 sc->realize(s, errp); 55 } 56 } 57 58 int scsi_bus_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf, 59 void *hba_private) 60 { 61 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 62 int rc; 63 64 assert(cmd->len == 0); 65 rc = scsi_req_parse_cdb(dev, cmd, buf); 66 if (bus->info->parse_cdb) { 67 rc = bus->info->parse_cdb(dev, cmd, buf, hba_private); 68 } 69 return rc; 70 } 71 72 static SCSIRequest *scsi_device_alloc_req(SCSIDevice *s, uint32_t tag, uint32_t lun, 73 uint8_t *buf, void *hba_private) 74 { 75 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 76 if (sc->alloc_req) { 77 return sc->alloc_req(s, tag, lun, buf, hba_private); 78 } 79 80 return NULL; 81 } 82 83 void scsi_device_unit_attention_reported(SCSIDevice *s) 84 { 85 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 86 if (sc->unit_attention_reported) { 87 sc->unit_attention_reported(s); 88 } 89 } 90 91 /* Create a scsi bus, and attach devices to it. */ 92 void scsi_bus_new(SCSIBus *bus, size_t bus_size, DeviceState *host, 93 const SCSIBusInfo *info, const char *bus_name) 94 { 95 qbus_create_inplace(bus, bus_size, TYPE_SCSI_BUS, host, bus_name); 96 bus->busnr = next_scsi_bus++; 97 bus->info = info; 98 qbus_set_bus_hotplug_handler(BUS(bus), &error_abort); 99 } 100 101 static void scsi_dma_restart_bh(void *opaque) 102 { 103 SCSIDevice *s = opaque; 104 SCSIRequest *req, *next; 105 106 qemu_bh_delete(s->bh); 107 s->bh = NULL; 108 109 aio_context_acquire(blk_get_aio_context(s->conf.blk)); 110 QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) { 111 scsi_req_ref(req); 112 if (req->retry) { 113 req->retry = false; 114 switch (req->cmd.mode) { 115 case SCSI_XFER_FROM_DEV: 116 case SCSI_XFER_TO_DEV: 117 scsi_req_continue(req); 118 break; 119 case SCSI_XFER_NONE: 120 scsi_req_dequeue(req); 121 scsi_req_enqueue(req); 122 break; 123 } 124 } 125 scsi_req_unref(req); 126 } 127 aio_context_release(blk_get_aio_context(s->conf.blk)); 128 } 129 130 void scsi_req_retry(SCSIRequest *req) 131 { 132 /* No need to save a reference, because scsi_dma_restart_bh just 133 * looks at the request list. */ 134 req->retry = true; 135 } 136 137 static void scsi_dma_restart_cb(void *opaque, int running, RunState state) 138 { 139 SCSIDevice *s = opaque; 140 141 if (!running) { 142 return; 143 } 144 if (!s->bh) { 145 AioContext *ctx = blk_get_aio_context(s->conf.blk); 146 s->bh = aio_bh_new(ctx, scsi_dma_restart_bh, s); 147 qemu_bh_schedule(s->bh); 148 } 149 } 150 151 static void scsi_qdev_realize(DeviceState *qdev, Error **errp) 152 { 153 SCSIDevice *dev = SCSI_DEVICE(qdev); 154 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 155 SCSIDevice *d; 156 Error *local_err = NULL; 157 158 if (dev->channel > bus->info->max_channel) { 159 error_setg(errp, "bad scsi channel id: %d", dev->channel); 160 return; 161 } 162 if (dev->id != -1 && dev->id > bus->info->max_target) { 163 error_setg(errp, "bad scsi device id: %d", dev->id); 164 return; 165 } 166 if (dev->lun != -1 && dev->lun > bus->info->max_lun) { 167 error_setg(errp, "bad scsi device lun: %d", dev->lun); 168 return; 169 } 170 171 if (dev->id == -1) { 172 int id = -1; 173 if (dev->lun == -1) { 174 dev->lun = 0; 175 } 176 do { 177 d = scsi_device_find(bus, dev->channel, ++id, dev->lun); 178 } while (d && d->lun == dev->lun && id < bus->info->max_target); 179 if (d && d->lun == dev->lun) { 180 error_setg(errp, "no free target"); 181 return; 182 } 183 dev->id = id; 184 } else if (dev->lun == -1) { 185 int lun = -1; 186 do { 187 d = scsi_device_find(bus, dev->channel, dev->id, ++lun); 188 } while (d && d->lun == lun && lun < bus->info->max_lun); 189 if (d && d->lun == lun) { 190 error_setg(errp, "no free lun"); 191 return; 192 } 193 dev->lun = lun; 194 } else { 195 d = scsi_device_find(bus, dev->channel, dev->id, dev->lun); 196 assert(d); 197 if (d->lun == dev->lun && dev != d) { 198 error_setg(errp, "lun already used by '%s'", d->qdev.id); 199 return; 200 } 201 } 202 203 QTAILQ_INIT(&dev->requests); 204 scsi_device_realize(dev, &local_err); 205 if (local_err) { 206 error_propagate(errp, local_err); 207 return; 208 } 209 dev->vmsentry = qemu_add_vm_change_state_handler(scsi_dma_restart_cb, 210 dev); 211 } 212 213 static void scsi_qdev_unrealize(DeviceState *qdev, Error **errp) 214 { 215 SCSIDevice *dev = SCSI_DEVICE(qdev); 216 217 if (dev->vmsentry) { 218 qemu_del_vm_change_state_handler(dev->vmsentry); 219 } 220 221 scsi_device_purge_requests(dev, SENSE_CODE(NO_SENSE)); 222 blockdev_mark_auto_del(dev->conf.blk); 223 } 224 225 /* handle legacy '-drive if=scsi,...' cmd line args */ 226 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk, 227 int unit, bool removable, int bootindex, 228 bool share_rw, 229 BlockdevOnError rerror, 230 BlockdevOnError werror, 231 const char *serial, Error **errp) 232 { 233 const char *driver; 234 char *name; 235 DeviceState *dev; 236 Error *err = NULL; 237 238 driver = blk_is_sg(blk) ? "scsi-generic" : "scsi-disk"; 239 dev = qdev_create(&bus->qbus, driver); 240 name = g_strdup_printf("legacy[%d]", unit); 241 object_property_add_child(OBJECT(bus), name, OBJECT(dev), NULL); 242 g_free(name); 243 244 qdev_prop_set_uint32(dev, "scsi-id", unit); 245 if (bootindex >= 0) { 246 object_property_set_int(OBJECT(dev), bootindex, "bootindex", 247 &error_abort); 248 } 249 if (object_property_find(OBJECT(dev), "removable", NULL)) { 250 qdev_prop_set_bit(dev, "removable", removable); 251 } 252 if (serial && object_property_find(OBJECT(dev), "serial", NULL)) { 253 qdev_prop_set_string(dev, "serial", serial); 254 } 255 qdev_prop_set_drive(dev, "drive", blk, &err); 256 if (err) { 257 error_propagate(errp, err); 258 object_unparent(OBJECT(dev)); 259 return NULL; 260 } 261 object_property_set_bool(OBJECT(dev), share_rw, "share-rw", &err); 262 if (err != NULL) { 263 error_propagate(errp, err); 264 object_unparent(OBJECT(dev)); 265 return NULL; 266 } 267 268 qdev_prop_set_enum(dev, "rerror", rerror); 269 qdev_prop_set_enum(dev, "werror", werror); 270 271 object_property_set_bool(OBJECT(dev), true, "realized", &err); 272 if (err != NULL) { 273 error_propagate(errp, err); 274 object_unparent(OBJECT(dev)); 275 return NULL; 276 } 277 return SCSI_DEVICE(dev); 278 } 279 280 void scsi_bus_legacy_handle_cmdline(SCSIBus *bus) 281 { 282 Location loc; 283 DriveInfo *dinfo; 284 int unit; 285 286 loc_push_none(&loc); 287 for (unit = 0; unit <= bus->info->max_target; unit++) { 288 dinfo = drive_get(IF_SCSI, bus->busnr, unit); 289 if (dinfo == NULL) { 290 continue; 291 } 292 qemu_opts_loc_restore(dinfo->opts); 293 scsi_bus_legacy_add_drive(bus, blk_by_legacy_dinfo(dinfo), 294 unit, false, -1, false, 295 BLOCKDEV_ON_ERROR_AUTO, 296 BLOCKDEV_ON_ERROR_AUTO, 297 NULL, &error_fatal); 298 } 299 loc_pop(&loc); 300 } 301 302 static int32_t scsi_invalid_field(SCSIRequest *req, uint8_t *buf) 303 { 304 scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD)); 305 scsi_req_complete(req, CHECK_CONDITION); 306 return 0; 307 } 308 309 static const struct SCSIReqOps reqops_invalid_field = { 310 .size = sizeof(SCSIRequest), 311 .send_command = scsi_invalid_field 312 }; 313 314 /* SCSIReqOps implementation for invalid commands. */ 315 316 static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf) 317 { 318 scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE)); 319 scsi_req_complete(req, CHECK_CONDITION); 320 return 0; 321 } 322 323 static const struct SCSIReqOps reqops_invalid_opcode = { 324 .size = sizeof(SCSIRequest), 325 .send_command = scsi_invalid_command 326 }; 327 328 /* SCSIReqOps implementation for unit attention conditions. */ 329 330 static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf) 331 { 332 if (req->dev->unit_attention.key == UNIT_ATTENTION) { 333 scsi_req_build_sense(req, req->dev->unit_attention); 334 } else if (req->bus->unit_attention.key == UNIT_ATTENTION) { 335 scsi_req_build_sense(req, req->bus->unit_attention); 336 } 337 scsi_req_complete(req, CHECK_CONDITION); 338 return 0; 339 } 340 341 static const struct SCSIReqOps reqops_unit_attention = { 342 .size = sizeof(SCSIRequest), 343 .send_command = scsi_unit_attention 344 }; 345 346 /* SCSIReqOps implementation for REPORT LUNS and for commands sent to 347 an invalid LUN. */ 348 349 typedef struct SCSITargetReq SCSITargetReq; 350 351 struct SCSITargetReq { 352 SCSIRequest req; 353 int len; 354 uint8_t *buf; 355 int buf_len; 356 }; 357 358 static void store_lun(uint8_t *outbuf, int lun) 359 { 360 if (lun < 256) { 361 outbuf[1] = lun; 362 return; 363 } 364 outbuf[1] = (lun & 255); 365 outbuf[0] = (lun >> 8) | 0x40; 366 } 367 368 static bool scsi_target_emulate_report_luns(SCSITargetReq *r) 369 { 370 BusChild *kid; 371 int i, len, n; 372 int channel, id; 373 bool found_lun0; 374 375 if (r->req.cmd.xfer < 16) { 376 return false; 377 } 378 if (r->req.cmd.buf[2] > 2) { 379 return false; 380 } 381 channel = r->req.dev->channel; 382 id = r->req.dev->id; 383 found_lun0 = false; 384 n = 0; 385 QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) { 386 DeviceState *qdev = kid->child; 387 SCSIDevice *dev = SCSI_DEVICE(qdev); 388 389 if (dev->channel == channel && dev->id == id) { 390 if (dev->lun == 0) { 391 found_lun0 = true; 392 } 393 n += 8; 394 } 395 } 396 if (!found_lun0) { 397 n += 8; 398 } 399 400 scsi_target_alloc_buf(&r->req, n + 8); 401 402 len = MIN(n + 8, r->req.cmd.xfer & ~7); 403 memset(r->buf, 0, len); 404 stl_be_p(&r->buf[0], n); 405 i = found_lun0 ? 8 : 16; 406 QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) { 407 DeviceState *qdev = kid->child; 408 SCSIDevice *dev = SCSI_DEVICE(qdev); 409 410 if (dev->channel == channel && dev->id == id) { 411 store_lun(&r->buf[i], dev->lun); 412 i += 8; 413 } 414 } 415 assert(i == n + 8); 416 r->len = len; 417 return true; 418 } 419 420 static bool scsi_target_emulate_inquiry(SCSITargetReq *r) 421 { 422 assert(r->req.dev->lun != r->req.lun); 423 424 scsi_target_alloc_buf(&r->req, SCSI_INQUIRY_LEN); 425 426 if (r->req.cmd.buf[1] & 0x2) { 427 /* Command support data - optional, not implemented */ 428 return false; 429 } 430 431 if (r->req.cmd.buf[1] & 0x1) { 432 /* Vital product data */ 433 uint8_t page_code = r->req.cmd.buf[2]; 434 r->buf[r->len++] = page_code ; /* this page */ 435 r->buf[r->len++] = 0x00; 436 437 switch (page_code) { 438 case 0x00: /* Supported page codes, mandatory */ 439 { 440 int pages; 441 pages = r->len++; 442 r->buf[r->len++] = 0x00; /* list of supported pages (this page) */ 443 r->buf[pages] = r->len - pages - 1; /* number of pages */ 444 break; 445 } 446 default: 447 return false; 448 } 449 /* done with EVPD */ 450 assert(r->len < r->buf_len); 451 r->len = MIN(r->req.cmd.xfer, r->len); 452 return true; 453 } 454 455 /* Standard INQUIRY data */ 456 if (r->req.cmd.buf[2] != 0) { 457 return false; 458 } 459 460 /* PAGE CODE == 0 */ 461 r->len = MIN(r->req.cmd.xfer, SCSI_INQUIRY_LEN); 462 memset(r->buf, 0, r->len); 463 if (r->req.lun != 0) { 464 r->buf[0] = TYPE_NO_LUN; 465 } else { 466 r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE; 467 r->buf[2] = 5; /* Version */ 468 r->buf[3] = 2 | 0x10; /* HiSup, response data format */ 469 r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */ 470 r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ. */ 471 memcpy(&r->buf[8], "QEMU ", 8); 472 memcpy(&r->buf[16], "QEMU TARGET ", 16); 473 pstrcpy((char *) &r->buf[32], 4, qemu_hw_version()); 474 } 475 return true; 476 } 477 478 static size_t scsi_sense_len(SCSIRequest *req) 479 { 480 if (req->dev->type == TYPE_SCANNER) 481 return SCSI_SENSE_LEN_SCANNER; 482 else 483 return SCSI_SENSE_LEN; 484 } 485 486 static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf) 487 { 488 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 489 int fixed_sense = (req->cmd.buf[1] & 1) == 0; 490 491 if (req->lun != 0 && 492 buf[0] != INQUIRY && buf[0] != REQUEST_SENSE) { 493 scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED)); 494 scsi_req_complete(req, CHECK_CONDITION); 495 return 0; 496 } 497 switch (buf[0]) { 498 case REPORT_LUNS: 499 if (!scsi_target_emulate_report_luns(r)) { 500 goto illegal_request; 501 } 502 break; 503 case INQUIRY: 504 if (!scsi_target_emulate_inquiry(r)) { 505 goto illegal_request; 506 } 507 break; 508 case REQUEST_SENSE: 509 scsi_target_alloc_buf(&r->req, scsi_sense_len(req)); 510 if (req->lun != 0) { 511 const struct SCSISense sense = SENSE_CODE(LUN_NOT_SUPPORTED); 512 513 r->len = scsi_build_sense_buf(r->buf, req->cmd.xfer, 514 sense, fixed_sense); 515 } else { 516 r->len = scsi_device_get_sense(r->req.dev, r->buf, 517 MIN(req->cmd.xfer, r->buf_len), 518 fixed_sense); 519 } 520 if (r->req.dev->sense_is_ua) { 521 scsi_device_unit_attention_reported(req->dev); 522 r->req.dev->sense_len = 0; 523 r->req.dev->sense_is_ua = false; 524 } 525 break; 526 case TEST_UNIT_READY: 527 break; 528 default: 529 scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE)); 530 scsi_req_complete(req, CHECK_CONDITION); 531 return 0; 532 illegal_request: 533 scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD)); 534 scsi_req_complete(req, CHECK_CONDITION); 535 return 0; 536 } 537 538 if (!r->len) { 539 scsi_req_complete(req, GOOD); 540 } 541 return r->len; 542 } 543 544 static void scsi_target_read_data(SCSIRequest *req) 545 { 546 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 547 uint32_t n; 548 549 n = r->len; 550 if (n > 0) { 551 r->len = 0; 552 scsi_req_data(&r->req, n); 553 } else { 554 scsi_req_complete(&r->req, GOOD); 555 } 556 } 557 558 static uint8_t *scsi_target_get_buf(SCSIRequest *req) 559 { 560 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 561 562 return r->buf; 563 } 564 565 static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len) 566 { 567 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 568 569 r->buf = g_malloc(len); 570 r->buf_len = len; 571 572 return r->buf; 573 } 574 575 static void scsi_target_free_buf(SCSIRequest *req) 576 { 577 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 578 579 g_free(r->buf); 580 } 581 582 static const struct SCSIReqOps reqops_target_command = { 583 .size = sizeof(SCSITargetReq), 584 .send_command = scsi_target_send_command, 585 .read_data = scsi_target_read_data, 586 .get_buf = scsi_target_get_buf, 587 .free_req = scsi_target_free_buf, 588 }; 589 590 591 SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d, 592 uint32_t tag, uint32_t lun, void *hba_private) 593 { 594 SCSIRequest *req; 595 SCSIBus *bus = scsi_bus_from_device(d); 596 BusState *qbus = BUS(bus); 597 const int memset_off = offsetof(SCSIRequest, sense) 598 + sizeof(req->sense); 599 600 req = g_malloc(reqops->size); 601 memset((uint8_t *)req + memset_off, 0, reqops->size - memset_off); 602 req->refcount = 1; 603 req->bus = bus; 604 req->dev = d; 605 req->tag = tag; 606 req->lun = lun; 607 req->hba_private = hba_private; 608 req->status = -1; 609 req->ops = reqops; 610 object_ref(OBJECT(d)); 611 object_ref(OBJECT(qbus->parent)); 612 notifier_list_init(&req->cancel_notifiers); 613 trace_scsi_req_alloc(req->dev->id, req->lun, req->tag); 614 return req; 615 } 616 617 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun, 618 uint8_t *buf, void *hba_private) 619 { 620 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus); 621 const SCSIReqOps *ops; 622 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(d); 623 SCSIRequest *req; 624 SCSICommand cmd = { .len = 0 }; 625 int ret; 626 627 if ((d->unit_attention.key == UNIT_ATTENTION || 628 bus->unit_attention.key == UNIT_ATTENTION) && 629 (buf[0] != INQUIRY && 630 buf[0] != REPORT_LUNS && 631 buf[0] != GET_CONFIGURATION && 632 buf[0] != GET_EVENT_STATUS_NOTIFICATION && 633 634 /* 635 * If we already have a pending unit attention condition, 636 * report this one before triggering another one. 637 */ 638 !(buf[0] == REQUEST_SENSE && d->sense_is_ua))) { 639 ops = &reqops_unit_attention; 640 } else if (lun != d->lun || 641 buf[0] == REPORT_LUNS || 642 (buf[0] == REQUEST_SENSE && d->sense_len)) { 643 ops = &reqops_target_command; 644 } else { 645 ops = NULL; 646 } 647 648 if (ops != NULL || !sc->parse_cdb) { 649 ret = scsi_req_parse_cdb(d, &cmd, buf); 650 } else { 651 ret = sc->parse_cdb(d, &cmd, buf, hba_private); 652 } 653 654 if (ret != 0) { 655 trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]); 656 req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private); 657 } else { 658 assert(cmd.len != 0); 659 trace_scsi_req_parsed(d->id, lun, tag, buf[0], 660 cmd.mode, cmd.xfer); 661 if (cmd.lba != -1) { 662 trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0], 663 cmd.lba); 664 } 665 666 if (cmd.xfer > INT32_MAX) { 667 req = scsi_req_alloc(&reqops_invalid_field, d, tag, lun, hba_private); 668 } else if (ops) { 669 req = scsi_req_alloc(ops, d, tag, lun, hba_private); 670 } else { 671 req = scsi_device_alloc_req(d, tag, lun, buf, hba_private); 672 } 673 } 674 675 req->cmd = cmd; 676 req->resid = req->cmd.xfer; 677 678 switch (buf[0]) { 679 case INQUIRY: 680 trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]); 681 break; 682 case TEST_UNIT_READY: 683 trace_scsi_test_unit_ready(d->id, lun, tag); 684 break; 685 case REPORT_LUNS: 686 trace_scsi_report_luns(d->id, lun, tag); 687 break; 688 case REQUEST_SENSE: 689 trace_scsi_request_sense(d->id, lun, tag); 690 break; 691 default: 692 break; 693 } 694 695 return req; 696 } 697 698 uint8_t *scsi_req_get_buf(SCSIRequest *req) 699 { 700 return req->ops->get_buf(req); 701 } 702 703 static void scsi_clear_unit_attention(SCSIRequest *req) 704 { 705 SCSISense *ua; 706 if (req->dev->unit_attention.key != UNIT_ATTENTION && 707 req->bus->unit_attention.key != UNIT_ATTENTION) { 708 return; 709 } 710 711 /* 712 * If an INQUIRY command enters the enabled command state, 713 * the device server shall [not] clear any unit attention condition; 714 * See also MMC-6, paragraphs 6.5 and 6.6.2. 715 */ 716 if (req->cmd.buf[0] == INQUIRY || 717 req->cmd.buf[0] == GET_CONFIGURATION || 718 req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) { 719 return; 720 } 721 722 if (req->dev->unit_attention.key == UNIT_ATTENTION) { 723 ua = &req->dev->unit_attention; 724 } else { 725 ua = &req->bus->unit_attention; 726 } 727 728 /* 729 * If a REPORT LUNS command enters the enabled command state, [...] 730 * the device server shall clear any pending unit attention condition 731 * with an additional sense code of REPORTED LUNS DATA HAS CHANGED. 732 */ 733 if (req->cmd.buf[0] == REPORT_LUNS && 734 !(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc && 735 ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) { 736 return; 737 } 738 739 *ua = SENSE_CODE(NO_SENSE); 740 } 741 742 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len) 743 { 744 int ret; 745 746 assert(len >= 14); 747 if (!req->sense_len) { 748 return 0; 749 } 750 751 ret = scsi_convert_sense(req->sense, req->sense_len, buf, len, true); 752 753 /* 754 * FIXME: clearing unit attention conditions upon autosense should be done 755 * only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b 756 * (SAM-5, 5.14). 757 * 758 * We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and 759 * 10b for HBAs that do not support it (do not call scsi_req_get_sense). 760 * Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b. 761 */ 762 if (req->dev->sense_is_ua) { 763 scsi_device_unit_attention_reported(req->dev); 764 req->dev->sense_len = 0; 765 req->dev->sense_is_ua = false; 766 } 767 return ret; 768 } 769 770 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed) 771 { 772 return scsi_convert_sense(dev->sense, dev->sense_len, buf, len, fixed); 773 } 774 775 void scsi_req_build_sense(SCSIRequest *req, SCSISense sense) 776 { 777 trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag, 778 sense.key, sense.asc, sense.ascq); 779 req->sense_len = scsi_build_sense(req->sense, sense); 780 } 781 782 static void scsi_req_enqueue_internal(SCSIRequest *req) 783 { 784 assert(!req->enqueued); 785 scsi_req_ref(req); 786 if (req->bus->info->get_sg_list) { 787 req->sg = req->bus->info->get_sg_list(req); 788 } else { 789 req->sg = NULL; 790 } 791 req->enqueued = true; 792 QTAILQ_INSERT_TAIL(&req->dev->requests, req, next); 793 } 794 795 int32_t scsi_req_enqueue(SCSIRequest *req) 796 { 797 int32_t rc; 798 799 assert(!req->retry); 800 scsi_req_enqueue_internal(req); 801 scsi_req_ref(req); 802 rc = req->ops->send_command(req, req->cmd.buf); 803 scsi_req_unref(req); 804 return rc; 805 } 806 807 static void scsi_req_dequeue(SCSIRequest *req) 808 { 809 trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag); 810 req->retry = false; 811 if (req->enqueued) { 812 QTAILQ_REMOVE(&req->dev->requests, req, next); 813 req->enqueued = false; 814 scsi_req_unref(req); 815 } 816 } 817 818 static int scsi_get_performance_length(int num_desc, int type, int data_type) 819 { 820 /* MMC-6, paragraph 6.7. */ 821 switch (type) { 822 case 0: 823 if ((data_type & 3) == 0) { 824 /* Each descriptor is as in Table 295 - Nominal performance. */ 825 return 16 * num_desc + 8; 826 } else { 827 /* Each descriptor is as in Table 296 - Exceptions. */ 828 return 6 * num_desc + 8; 829 } 830 case 1: 831 case 4: 832 case 5: 833 return 8 * num_desc + 8; 834 case 2: 835 return 2048 * num_desc + 8; 836 case 3: 837 return 16 * num_desc + 8; 838 default: 839 return 8; 840 } 841 } 842 843 static int ata_passthrough_xfer_unit(SCSIDevice *dev, uint8_t *buf) 844 { 845 int byte_block = (buf[2] >> 2) & 0x1; 846 int type = (buf[2] >> 4) & 0x1; 847 int xfer_unit; 848 849 if (byte_block) { 850 if (type) { 851 xfer_unit = dev->blocksize; 852 } else { 853 xfer_unit = 512; 854 } 855 } else { 856 xfer_unit = 1; 857 } 858 859 return xfer_unit; 860 } 861 862 static int ata_passthrough_12_xfer(SCSIDevice *dev, uint8_t *buf) 863 { 864 int length = buf[2] & 0x3; 865 int xfer; 866 int unit = ata_passthrough_xfer_unit(dev, buf); 867 868 switch (length) { 869 case 0: 870 case 3: /* USB-specific. */ 871 default: 872 xfer = 0; 873 break; 874 case 1: 875 xfer = buf[3]; 876 break; 877 case 2: 878 xfer = buf[4]; 879 break; 880 } 881 882 return xfer * unit; 883 } 884 885 static int ata_passthrough_16_xfer(SCSIDevice *dev, uint8_t *buf) 886 { 887 int extend = buf[1] & 0x1; 888 int length = buf[2] & 0x3; 889 int xfer; 890 int unit = ata_passthrough_xfer_unit(dev, buf); 891 892 switch (length) { 893 case 0: 894 case 3: /* USB-specific. */ 895 default: 896 xfer = 0; 897 break; 898 case 1: 899 xfer = buf[4]; 900 xfer |= (extend ? buf[3] << 8 : 0); 901 break; 902 case 2: 903 xfer = buf[6]; 904 xfer |= (extend ? buf[5] << 8 : 0); 905 break; 906 } 907 908 return xfer * unit; 909 } 910 911 static int scsi_req_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 912 { 913 cmd->xfer = scsi_cdb_xfer(buf); 914 switch (buf[0]) { 915 case TEST_UNIT_READY: 916 case REWIND: 917 case START_STOP: 918 case SET_CAPACITY: 919 case WRITE_FILEMARKS: 920 case WRITE_FILEMARKS_16: 921 case SPACE: 922 case RESERVE: 923 case RELEASE: 924 case ERASE: 925 case ALLOW_MEDIUM_REMOVAL: 926 case SEEK_10: 927 case SYNCHRONIZE_CACHE: 928 case SYNCHRONIZE_CACHE_16: 929 case LOCATE_16: 930 case LOCK_UNLOCK_CACHE: 931 case SET_CD_SPEED: 932 case SET_LIMITS: 933 case WRITE_LONG_10: 934 case UPDATE_BLOCK: 935 case RESERVE_TRACK: 936 case SET_READ_AHEAD: 937 case PRE_FETCH: 938 case PRE_FETCH_16: 939 case ALLOW_OVERWRITE: 940 cmd->xfer = 0; 941 break; 942 case VERIFY_10: 943 case VERIFY_12: 944 case VERIFY_16: 945 if ((buf[1] & 2) == 0) { 946 cmd->xfer = 0; 947 } else if ((buf[1] & 4) != 0) { 948 cmd->xfer = 1; 949 } 950 cmd->xfer *= dev->blocksize; 951 break; 952 case MODE_SENSE: 953 break; 954 case WRITE_SAME_10: 955 case WRITE_SAME_16: 956 cmd->xfer = buf[1] & 1 ? 0 : dev->blocksize; 957 break; 958 case READ_CAPACITY_10: 959 cmd->xfer = 8; 960 break; 961 case READ_BLOCK_LIMITS: 962 cmd->xfer = 6; 963 break; 964 case SEND_VOLUME_TAG: 965 /* GPCMD_SET_STREAMING from multimedia commands. */ 966 if (dev->type == TYPE_ROM) { 967 cmd->xfer = buf[10] | (buf[9] << 8); 968 } else { 969 cmd->xfer = buf[9] | (buf[8] << 8); 970 } 971 break; 972 case WRITE_6: 973 /* length 0 means 256 blocks */ 974 if (cmd->xfer == 0) { 975 cmd->xfer = 256; 976 } 977 /* fall through */ 978 case WRITE_10: 979 case WRITE_VERIFY_10: 980 case WRITE_12: 981 case WRITE_VERIFY_12: 982 case WRITE_16: 983 case WRITE_VERIFY_16: 984 cmd->xfer *= dev->blocksize; 985 break; 986 case READ_6: 987 case READ_REVERSE: 988 /* length 0 means 256 blocks */ 989 if (cmd->xfer == 0) { 990 cmd->xfer = 256; 991 } 992 /* fall through */ 993 case READ_10: 994 case READ_12: 995 case READ_16: 996 cmd->xfer *= dev->blocksize; 997 break; 998 case FORMAT_UNIT: 999 /* MMC mandates the parameter list to be 12-bytes long. Parameters 1000 * for block devices are restricted to the header right now. */ 1001 if (dev->type == TYPE_ROM && (buf[1] & 16)) { 1002 cmd->xfer = 12; 1003 } else { 1004 cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4); 1005 } 1006 break; 1007 case INQUIRY: 1008 case RECEIVE_DIAGNOSTIC: 1009 case SEND_DIAGNOSTIC: 1010 cmd->xfer = buf[4] | (buf[3] << 8); 1011 break; 1012 case READ_CD: 1013 case READ_BUFFER: 1014 case WRITE_BUFFER: 1015 case SEND_CUE_SHEET: 1016 cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16); 1017 break; 1018 case PERSISTENT_RESERVE_OUT: 1019 cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL; 1020 break; 1021 case ERASE_12: 1022 if (dev->type == TYPE_ROM) { 1023 /* MMC command GET PERFORMANCE. */ 1024 cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8), 1025 buf[10], buf[1] & 0x1f); 1026 } 1027 break; 1028 case MECHANISM_STATUS: 1029 case READ_DVD_STRUCTURE: 1030 case SEND_DVD_STRUCTURE: 1031 case MAINTENANCE_OUT: 1032 case MAINTENANCE_IN: 1033 if (dev->type == TYPE_ROM) { 1034 /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */ 1035 cmd->xfer = buf[9] | (buf[8] << 8); 1036 } 1037 break; 1038 case ATA_PASSTHROUGH_12: 1039 if (dev->type == TYPE_ROM) { 1040 /* BLANK command of MMC */ 1041 cmd->xfer = 0; 1042 } else { 1043 cmd->xfer = ata_passthrough_12_xfer(dev, buf); 1044 } 1045 break; 1046 case ATA_PASSTHROUGH_16: 1047 cmd->xfer = ata_passthrough_16_xfer(dev, buf); 1048 break; 1049 } 1050 return 0; 1051 } 1052 1053 static int scsi_req_stream_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1054 { 1055 switch (buf[0]) { 1056 /* stream commands */ 1057 case ERASE_12: 1058 case ERASE_16: 1059 cmd->xfer = 0; 1060 break; 1061 case READ_6: 1062 case READ_REVERSE: 1063 case RECOVER_BUFFERED_DATA: 1064 case WRITE_6: 1065 cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16); 1066 if (buf[1] & 0x01) { /* fixed */ 1067 cmd->xfer *= dev->blocksize; 1068 } 1069 break; 1070 case READ_16: 1071 case READ_REVERSE_16: 1072 case VERIFY_16: 1073 case WRITE_16: 1074 cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16); 1075 if (buf[1] & 0x01) { /* fixed */ 1076 cmd->xfer *= dev->blocksize; 1077 } 1078 break; 1079 case REWIND: 1080 case LOAD_UNLOAD: 1081 cmd->xfer = 0; 1082 break; 1083 case SPACE_16: 1084 cmd->xfer = buf[13] | (buf[12] << 8); 1085 break; 1086 case READ_POSITION: 1087 switch (buf[1] & 0x1f) /* operation code */ { 1088 case SHORT_FORM_BLOCK_ID: 1089 case SHORT_FORM_VENDOR_SPECIFIC: 1090 cmd->xfer = 20; 1091 break; 1092 case LONG_FORM: 1093 cmd->xfer = 32; 1094 break; 1095 case EXTENDED_FORM: 1096 cmd->xfer = buf[8] | (buf[7] << 8); 1097 break; 1098 default: 1099 return -1; 1100 } 1101 1102 break; 1103 case FORMAT_UNIT: 1104 cmd->xfer = buf[4] | (buf[3] << 8); 1105 break; 1106 /* generic commands */ 1107 default: 1108 return scsi_req_xfer(cmd, dev, buf); 1109 } 1110 return 0; 1111 } 1112 1113 static int scsi_req_medium_changer_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1114 { 1115 switch (buf[0]) { 1116 /* medium changer commands */ 1117 case EXCHANGE_MEDIUM: 1118 case INITIALIZE_ELEMENT_STATUS: 1119 case INITIALIZE_ELEMENT_STATUS_WITH_RANGE: 1120 case MOVE_MEDIUM: 1121 case POSITION_TO_ELEMENT: 1122 cmd->xfer = 0; 1123 break; 1124 case READ_ELEMENT_STATUS: 1125 cmd->xfer = buf[9] | (buf[8] << 8) | (buf[7] << 16); 1126 break; 1127 1128 /* generic commands */ 1129 default: 1130 return scsi_req_xfer(cmd, dev, buf); 1131 } 1132 return 0; 1133 } 1134 1135 static int scsi_req_scanner_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1136 { 1137 switch (buf[0]) { 1138 /* Scanner commands */ 1139 case OBJECT_POSITION: 1140 cmd->xfer = 0; 1141 break; 1142 case SCAN: 1143 cmd->xfer = buf[4]; 1144 break; 1145 case READ_10: 1146 case SEND: 1147 case GET_WINDOW: 1148 case SET_WINDOW: 1149 cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16); 1150 break; 1151 default: 1152 /* GET_DATA_BUFFER_STATUS xfer handled by scsi_req_xfer */ 1153 return scsi_req_xfer(cmd, dev, buf); 1154 } 1155 1156 return 0; 1157 } 1158 1159 static void scsi_cmd_xfer_mode(SCSICommand *cmd) 1160 { 1161 if (!cmd->xfer) { 1162 cmd->mode = SCSI_XFER_NONE; 1163 return; 1164 } 1165 switch (cmd->buf[0]) { 1166 case WRITE_6: 1167 case WRITE_10: 1168 case WRITE_VERIFY_10: 1169 case WRITE_12: 1170 case WRITE_VERIFY_12: 1171 case WRITE_16: 1172 case WRITE_VERIFY_16: 1173 case VERIFY_10: 1174 case VERIFY_12: 1175 case VERIFY_16: 1176 case COPY: 1177 case COPY_VERIFY: 1178 case COMPARE: 1179 case CHANGE_DEFINITION: 1180 case LOG_SELECT: 1181 case MODE_SELECT: 1182 case MODE_SELECT_10: 1183 case SEND_DIAGNOSTIC: 1184 case WRITE_BUFFER: 1185 case FORMAT_UNIT: 1186 case REASSIGN_BLOCKS: 1187 case SEARCH_EQUAL: 1188 case SEARCH_HIGH: 1189 case SEARCH_LOW: 1190 case UPDATE_BLOCK: 1191 case WRITE_LONG_10: 1192 case WRITE_SAME_10: 1193 case WRITE_SAME_16: 1194 case UNMAP: 1195 case SEARCH_HIGH_12: 1196 case SEARCH_EQUAL_12: 1197 case SEARCH_LOW_12: 1198 case MEDIUM_SCAN: 1199 case SEND_VOLUME_TAG: 1200 case SEND_CUE_SHEET: 1201 case SEND_DVD_STRUCTURE: 1202 case PERSISTENT_RESERVE_OUT: 1203 case MAINTENANCE_OUT: 1204 case SET_WINDOW: 1205 case SCAN: 1206 /* SCAN conflicts with START_STOP. START_STOP has cmd->xfer set to 0 for 1207 * non-scanner devices, so we only get here for SCAN and not for START_STOP. 1208 */ 1209 cmd->mode = SCSI_XFER_TO_DEV; 1210 break; 1211 case ATA_PASSTHROUGH_12: 1212 case ATA_PASSTHROUGH_16: 1213 /* T_DIR */ 1214 cmd->mode = (cmd->buf[2] & 0x8) ? 1215 SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV; 1216 break; 1217 default: 1218 cmd->mode = SCSI_XFER_FROM_DEV; 1219 break; 1220 } 1221 } 1222 1223 int scsi_req_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf) 1224 { 1225 int rc; 1226 int len; 1227 1228 cmd->lba = -1; 1229 len = scsi_cdb_length(buf); 1230 if (len < 0) { 1231 return -1; 1232 } 1233 1234 cmd->len = len; 1235 switch (dev->type) { 1236 case TYPE_TAPE: 1237 rc = scsi_req_stream_xfer(cmd, dev, buf); 1238 break; 1239 case TYPE_MEDIUM_CHANGER: 1240 rc = scsi_req_medium_changer_xfer(cmd, dev, buf); 1241 break; 1242 case TYPE_SCANNER: 1243 rc = scsi_req_scanner_length(cmd, dev, buf); 1244 break; 1245 default: 1246 rc = scsi_req_xfer(cmd, dev, buf); 1247 break; 1248 } 1249 1250 if (rc != 0) 1251 return rc; 1252 1253 memcpy(cmd->buf, buf, cmd->len); 1254 scsi_cmd_xfer_mode(cmd); 1255 cmd->lba = scsi_cmd_lba(cmd); 1256 return 0; 1257 } 1258 1259 void scsi_device_report_change(SCSIDevice *dev, SCSISense sense) 1260 { 1261 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 1262 1263 scsi_device_set_ua(dev, sense); 1264 if (bus->info->change) { 1265 bus->info->change(bus, dev, sense); 1266 } 1267 } 1268 1269 SCSIRequest *scsi_req_ref(SCSIRequest *req) 1270 { 1271 assert(req->refcount > 0); 1272 req->refcount++; 1273 return req; 1274 } 1275 1276 void scsi_req_unref(SCSIRequest *req) 1277 { 1278 assert(req->refcount > 0); 1279 if (--req->refcount == 0) { 1280 BusState *qbus = req->dev->qdev.parent_bus; 1281 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, qbus); 1282 1283 if (bus->info->free_request && req->hba_private) { 1284 bus->info->free_request(bus, req->hba_private); 1285 } 1286 if (req->ops->free_req) { 1287 req->ops->free_req(req); 1288 } 1289 object_unref(OBJECT(req->dev)); 1290 object_unref(OBJECT(qbus->parent)); 1291 g_free(req); 1292 } 1293 } 1294 1295 /* Tell the device that we finished processing this chunk of I/O. It 1296 will start the next chunk or complete the command. */ 1297 void scsi_req_continue(SCSIRequest *req) 1298 { 1299 if (req->io_canceled) { 1300 trace_scsi_req_continue_canceled(req->dev->id, req->lun, req->tag); 1301 return; 1302 } 1303 trace_scsi_req_continue(req->dev->id, req->lun, req->tag); 1304 if (req->cmd.mode == SCSI_XFER_TO_DEV) { 1305 req->ops->write_data(req); 1306 } else { 1307 req->ops->read_data(req); 1308 } 1309 } 1310 1311 /* Called by the devices when data is ready for the HBA. The HBA should 1312 start a DMA operation to read or fill the device's data buffer. 1313 Once it completes, calling scsi_req_continue will restart I/O. */ 1314 void scsi_req_data(SCSIRequest *req, int len) 1315 { 1316 uint8_t *buf; 1317 if (req->io_canceled) { 1318 trace_scsi_req_data_canceled(req->dev->id, req->lun, req->tag, len); 1319 return; 1320 } 1321 trace_scsi_req_data(req->dev->id, req->lun, req->tag, len); 1322 assert(req->cmd.mode != SCSI_XFER_NONE); 1323 if (!req->sg) { 1324 req->resid -= len; 1325 req->bus->info->transfer_data(req, len); 1326 return; 1327 } 1328 1329 /* If the device calls scsi_req_data and the HBA specified a 1330 * scatter/gather list, the transfer has to happen in a single 1331 * step. */ 1332 assert(!req->dma_started); 1333 req->dma_started = true; 1334 1335 buf = scsi_req_get_buf(req); 1336 if (req->cmd.mode == SCSI_XFER_FROM_DEV) { 1337 req->resid = dma_buf_read(buf, len, req->sg); 1338 } else { 1339 req->resid = dma_buf_write(buf, len, req->sg); 1340 } 1341 scsi_req_continue(req); 1342 } 1343 1344 void scsi_req_print(SCSIRequest *req) 1345 { 1346 FILE *fp = stderr; 1347 int i; 1348 1349 fprintf(fp, "[%s id=%d] %s", 1350 req->dev->qdev.parent_bus->name, 1351 req->dev->id, 1352 scsi_command_name(req->cmd.buf[0])); 1353 for (i = 1; i < req->cmd.len; i++) { 1354 fprintf(fp, " 0x%02x", req->cmd.buf[i]); 1355 } 1356 switch (req->cmd.mode) { 1357 case SCSI_XFER_NONE: 1358 fprintf(fp, " - none\n"); 1359 break; 1360 case SCSI_XFER_FROM_DEV: 1361 fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer); 1362 break; 1363 case SCSI_XFER_TO_DEV: 1364 fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer); 1365 break; 1366 default: 1367 fprintf(fp, " - Oops\n"); 1368 break; 1369 } 1370 } 1371 1372 void scsi_req_complete(SCSIRequest *req, int status) 1373 { 1374 assert(req->status == -1); 1375 req->status = status; 1376 1377 assert(req->sense_len <= sizeof(req->sense)); 1378 if (status == GOOD) { 1379 req->sense_len = 0; 1380 } 1381 1382 if (req->sense_len) { 1383 memcpy(req->dev->sense, req->sense, req->sense_len); 1384 req->dev->sense_len = req->sense_len; 1385 req->dev->sense_is_ua = (req->ops == &reqops_unit_attention); 1386 } else { 1387 req->dev->sense_len = 0; 1388 req->dev->sense_is_ua = false; 1389 } 1390 1391 /* 1392 * Unit attention state is now stored in the device's sense buffer 1393 * if the HBA didn't do autosense. Clear the pending unit attention 1394 * flags. 1395 */ 1396 scsi_clear_unit_attention(req); 1397 1398 scsi_req_ref(req); 1399 scsi_req_dequeue(req); 1400 req->bus->info->complete(req, req->status, req->resid); 1401 1402 /* Cancelled requests might end up being completed instead of cancelled */ 1403 notifier_list_notify(&req->cancel_notifiers, req); 1404 scsi_req_unref(req); 1405 } 1406 1407 /* Called by the devices when the request is canceled. */ 1408 void scsi_req_cancel_complete(SCSIRequest *req) 1409 { 1410 assert(req->io_canceled); 1411 if (req->bus->info->cancel) { 1412 req->bus->info->cancel(req); 1413 } 1414 notifier_list_notify(&req->cancel_notifiers, req); 1415 scsi_req_unref(req); 1416 } 1417 1418 /* Cancel @req asynchronously. @notifier is added to @req's cancellation 1419 * notifier list, the bus will be notified the requests cancellation is 1420 * completed. 1421 * */ 1422 void scsi_req_cancel_async(SCSIRequest *req, Notifier *notifier) 1423 { 1424 trace_scsi_req_cancel(req->dev->id, req->lun, req->tag); 1425 if (notifier) { 1426 notifier_list_add(&req->cancel_notifiers, notifier); 1427 } 1428 if (req->io_canceled) { 1429 /* A blk_aio_cancel_async is pending; when it finishes, 1430 * scsi_req_cancel_complete will be called and will 1431 * call the notifier we just added. Just wait for that. 1432 */ 1433 assert(req->aiocb); 1434 return; 1435 } 1436 /* Dropped in scsi_req_cancel_complete. */ 1437 scsi_req_ref(req); 1438 scsi_req_dequeue(req); 1439 req->io_canceled = true; 1440 if (req->aiocb) { 1441 blk_aio_cancel_async(req->aiocb); 1442 } else { 1443 scsi_req_cancel_complete(req); 1444 } 1445 } 1446 1447 void scsi_req_cancel(SCSIRequest *req) 1448 { 1449 trace_scsi_req_cancel(req->dev->id, req->lun, req->tag); 1450 if (!req->enqueued) { 1451 return; 1452 } 1453 assert(!req->io_canceled); 1454 /* Dropped in scsi_req_cancel_complete. */ 1455 scsi_req_ref(req); 1456 scsi_req_dequeue(req); 1457 req->io_canceled = true; 1458 if (req->aiocb) { 1459 blk_aio_cancel(req->aiocb); 1460 } else { 1461 scsi_req_cancel_complete(req); 1462 } 1463 } 1464 1465 static int scsi_ua_precedence(SCSISense sense) 1466 { 1467 if (sense.key != UNIT_ATTENTION) { 1468 return INT_MAX; 1469 } 1470 if (sense.asc == 0x29 && sense.ascq == 0x04) { 1471 /* DEVICE INTERNAL RESET goes with POWER ON OCCURRED */ 1472 return 1; 1473 } else if (sense.asc == 0x3F && sense.ascq == 0x01) { 1474 /* MICROCODE HAS BEEN CHANGED goes with SCSI BUS RESET OCCURRED */ 1475 return 2; 1476 } else if (sense.asc == 0x29 && (sense.ascq == 0x05 || sense.ascq == 0x06)) { 1477 /* These two go with "all others". */ 1478 ; 1479 } else if (sense.asc == 0x29 && sense.ascq <= 0x07) { 1480 /* POWER ON, RESET OR BUS DEVICE RESET OCCURRED = 0 1481 * POWER ON OCCURRED = 1 1482 * SCSI BUS RESET OCCURRED = 2 1483 * BUS DEVICE RESET FUNCTION OCCURRED = 3 1484 * I_T NEXUS LOSS OCCURRED = 7 1485 */ 1486 return sense.ascq; 1487 } else if (sense.asc == 0x2F && sense.ascq == 0x01) { 1488 /* COMMANDS CLEARED BY POWER LOSS NOTIFICATION */ 1489 return 8; 1490 } 1491 return (sense.asc << 8) | sense.ascq; 1492 } 1493 1494 void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense) 1495 { 1496 int prec1, prec2; 1497 if (sense.key != UNIT_ATTENTION) { 1498 return; 1499 } 1500 trace_scsi_device_set_ua(sdev->id, sdev->lun, sense.key, 1501 sense.asc, sense.ascq); 1502 1503 /* 1504 * Override a pre-existing unit attention condition, except for a more 1505 * important reset condition. 1506 */ 1507 prec1 = scsi_ua_precedence(sdev->unit_attention); 1508 prec2 = scsi_ua_precedence(sense); 1509 if (prec2 < prec1) { 1510 sdev->unit_attention = sense; 1511 } 1512 } 1513 1514 void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense) 1515 { 1516 SCSIRequest *req; 1517 1518 aio_context_acquire(blk_get_aio_context(sdev->conf.blk)); 1519 while (!QTAILQ_EMPTY(&sdev->requests)) { 1520 req = QTAILQ_FIRST(&sdev->requests); 1521 scsi_req_cancel_async(req, NULL); 1522 } 1523 blk_drain(sdev->conf.blk); 1524 aio_context_release(blk_get_aio_context(sdev->conf.blk)); 1525 scsi_device_set_ua(sdev, sense); 1526 } 1527 1528 static char *scsibus_get_dev_path(DeviceState *dev) 1529 { 1530 SCSIDevice *d = SCSI_DEVICE(dev); 1531 DeviceState *hba = dev->parent_bus->parent; 1532 char *id; 1533 char *path; 1534 1535 id = qdev_get_dev_path(hba); 1536 if (id) { 1537 path = g_strdup_printf("%s/%d:%d:%d", id, d->channel, d->id, d->lun); 1538 } else { 1539 path = g_strdup_printf("%d:%d:%d", d->channel, d->id, d->lun); 1540 } 1541 g_free(id); 1542 return path; 1543 } 1544 1545 static char *scsibus_get_fw_dev_path(DeviceState *dev) 1546 { 1547 SCSIDevice *d = SCSI_DEVICE(dev); 1548 return g_strdup_printf("channel@%x/%s@%x,%x", d->channel, 1549 qdev_fw_name(dev), d->id, d->lun); 1550 } 1551 1552 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun) 1553 { 1554 BusChild *kid; 1555 SCSIDevice *target_dev = NULL; 1556 1557 QTAILQ_FOREACH_REVERSE(kid, &bus->qbus.children, ChildrenHead, sibling) { 1558 DeviceState *qdev = kid->child; 1559 SCSIDevice *dev = SCSI_DEVICE(qdev); 1560 1561 if (dev->channel == channel && dev->id == id) { 1562 if (dev->lun == lun) { 1563 return dev; 1564 } 1565 target_dev = dev; 1566 } 1567 } 1568 return target_dev; 1569 } 1570 1571 /* SCSI request list. For simplicity, pv points to the whole device */ 1572 1573 static int put_scsi_requests(QEMUFile *f, void *pv, size_t size, 1574 const VMStateField *field, QJSON *vmdesc) 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 return 0; 1599 } 1600 1601 static int get_scsi_requests(QEMUFile *f, void *pv, size_t size, 1602 const VMStateField *field) 1603 { 1604 SCSIDevice *s = pv; 1605 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus); 1606 int8_t sbyte; 1607 1608 while ((sbyte = qemu_get_sbyte(f)) > 0) { 1609 uint8_t buf[SCSI_CMD_BUF_SIZE]; 1610 uint32_t tag; 1611 uint32_t lun; 1612 SCSIRequest *req; 1613 1614 qemu_get_buffer(f, buf, sizeof(buf)); 1615 qemu_get_be32s(f, &tag); 1616 qemu_get_be32s(f, &lun); 1617 req = scsi_req_new(s, tag, lun, buf, NULL); 1618 req->retry = (sbyte == 1); 1619 if (bus->info->load_request) { 1620 req->hba_private = bus->info->load_request(f, req); 1621 } 1622 if (req->ops->load_request) { 1623 req->ops->load_request(f, req); 1624 } 1625 1626 /* Just restart it later. */ 1627 scsi_req_enqueue_internal(req); 1628 1629 /* At this point, the request will be kept alive by the reference 1630 * added by scsi_req_enqueue_internal, so we can release our reference. 1631 * The HBA of course will add its own reference in the load_request 1632 * callback if it needs to hold on the SCSIRequest. 1633 */ 1634 scsi_req_unref(req); 1635 } 1636 1637 return 0; 1638 } 1639 1640 static const VMStateInfo vmstate_info_scsi_requests = { 1641 .name = "scsi-requests", 1642 .get = get_scsi_requests, 1643 .put = put_scsi_requests, 1644 }; 1645 1646 static bool scsi_sense_state_needed(void *opaque) 1647 { 1648 SCSIDevice *s = opaque; 1649 1650 return s->sense_len > SCSI_SENSE_BUF_SIZE_OLD; 1651 } 1652 1653 static const VMStateDescription vmstate_scsi_sense_state = { 1654 .name = "SCSIDevice/sense", 1655 .version_id = 1, 1656 .minimum_version_id = 1, 1657 .needed = scsi_sense_state_needed, 1658 .fields = (VMStateField[]) { 1659 VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice, 1660 SCSI_SENSE_BUF_SIZE_OLD, 1661 SCSI_SENSE_BUF_SIZE - SCSI_SENSE_BUF_SIZE_OLD), 1662 VMSTATE_END_OF_LIST() 1663 } 1664 }; 1665 1666 const VMStateDescription vmstate_scsi_device = { 1667 .name = "SCSIDevice", 1668 .version_id = 1, 1669 .minimum_version_id = 1, 1670 .fields = (VMStateField[]) { 1671 VMSTATE_UINT8(unit_attention.key, SCSIDevice), 1672 VMSTATE_UINT8(unit_attention.asc, SCSIDevice), 1673 VMSTATE_UINT8(unit_attention.ascq, SCSIDevice), 1674 VMSTATE_BOOL(sense_is_ua, SCSIDevice), 1675 VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice, 0, SCSI_SENSE_BUF_SIZE_OLD), 1676 VMSTATE_UINT32(sense_len, SCSIDevice), 1677 { 1678 .name = "requests", 1679 .version_id = 0, 1680 .field_exists = NULL, 1681 .size = 0, /* ouch */ 1682 .info = &vmstate_info_scsi_requests, 1683 .flags = VMS_SINGLE, 1684 .offset = 0, 1685 }, 1686 VMSTATE_END_OF_LIST() 1687 }, 1688 .subsections = (const VMStateDescription*[]) { 1689 &vmstate_scsi_sense_state, 1690 NULL 1691 } 1692 }; 1693 1694 static void scsi_device_class_init(ObjectClass *klass, void *data) 1695 { 1696 DeviceClass *k = DEVICE_CLASS(klass); 1697 set_bit(DEVICE_CATEGORY_STORAGE, k->categories); 1698 k->bus_type = TYPE_SCSI_BUS; 1699 k->realize = scsi_qdev_realize; 1700 k->unrealize = scsi_qdev_unrealize; 1701 k->props = scsi_props; 1702 } 1703 1704 static void scsi_dev_instance_init(Object *obj) 1705 { 1706 DeviceState *dev = DEVICE(obj); 1707 SCSIDevice *s = SCSI_DEVICE(dev); 1708 1709 device_add_bootindex_property(obj, &s->conf.bootindex, 1710 "bootindex", NULL, 1711 &s->qdev, NULL); 1712 } 1713 1714 static const TypeInfo scsi_device_type_info = { 1715 .name = TYPE_SCSI_DEVICE, 1716 .parent = TYPE_DEVICE, 1717 .instance_size = sizeof(SCSIDevice), 1718 .abstract = true, 1719 .class_size = sizeof(SCSIDeviceClass), 1720 .class_init = scsi_device_class_init, 1721 .instance_init = scsi_dev_instance_init, 1722 }; 1723 1724 static void scsi_register_types(void) 1725 { 1726 type_register_static(&scsi_bus_info); 1727 type_register_static(&scsi_device_type_info); 1728 } 1729 1730 type_init(scsi_register_types) 1731