1 #include "qemu/osdep.h" 2 #include "qapi/error.h" 3 #include "qemu/error-report.h" 4 #include "qemu/module.h" 5 #include "qemu/option.h" 6 #include "qemu/hw-version.h" 7 #include "hw/qdev-properties.h" 8 #include "hw/scsi/scsi.h" 9 #include "migration/qemu-file-types.h" 10 #include "migration/vmstate.h" 11 #include "scsi/constants.h" 12 #include "system/block-backend.h" 13 #include "system/blockdev.h" 14 #include "system/system.h" 15 #include "system/runstate.h" 16 #include "trace.h" 17 #include "system/dma.h" 18 #include "qemu/cutils.h" 19 20 static char *scsibus_get_dev_path(DeviceState *dev); 21 static char *scsibus_get_fw_dev_path(DeviceState *dev); 22 static void scsi_req_dequeue(SCSIRequest *req); 23 static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len); 24 static void scsi_target_free_buf(SCSIRequest *req); 25 static void scsi_clear_reported_luns_changed(SCSIRequest *req); 26 27 static int next_scsi_bus; 28 29 static SCSIDevice *do_scsi_device_find(SCSIBus *bus, 30 int channel, int id, int lun, 31 bool include_unrealized) 32 { 33 BusChild *kid; 34 SCSIDevice *retval = NULL; 35 36 QTAILQ_FOREACH_RCU(kid, &bus->qbus.children, sibling) { 37 DeviceState *qdev = kid->child; 38 SCSIDevice *dev = SCSI_DEVICE(qdev); 39 40 if (dev->channel == channel && dev->id == id) { 41 if (dev->lun == lun) { 42 retval = dev; 43 break; 44 } 45 46 /* 47 * If we don't find exact match (channel/bus/lun), 48 * we will return the first device which matches channel/bus 49 */ 50 51 if (!retval) { 52 retval = dev; 53 } 54 } 55 } 56 57 /* 58 * This function might run on the IO thread and we might race against 59 * main thread hot-plugging the device. 60 * We assume that as soon as .realized is set to true we can let 61 * the user access the device. 62 */ 63 64 if (retval && !include_unrealized && !qdev_is_realized(&retval->qdev)) { 65 retval = NULL; 66 } 67 68 return retval; 69 } 70 71 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun) 72 { 73 RCU_READ_LOCK_GUARD(); 74 return do_scsi_device_find(bus, channel, id, lun, false); 75 } 76 77 SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int id, int lun) 78 { 79 SCSIDevice *d; 80 RCU_READ_LOCK_GUARD(); 81 d = do_scsi_device_find(bus, channel, id, lun, false); 82 if (d) { 83 object_ref(d); 84 } 85 return d; 86 } 87 88 /* 89 * Invoke @fn() for each enqueued request in device @s. Must be called from the 90 * main loop thread while the guest is stopped. This is only suitable for 91 * vmstate ->put(), use scsi_device_for_each_req_async() for other cases. 92 */ 93 static void scsi_device_for_each_req_sync(SCSIDevice *s, 94 void (*fn)(SCSIRequest *, void *), 95 void *opaque) 96 { 97 SCSIRequest *req; 98 SCSIRequest *next_req; 99 100 assert(!runstate_is_running()); 101 assert(qemu_in_main_thread()); 102 103 /* 104 * Locking is not necessary because the guest is stopped and no other 105 * threads can be accessing the requests list, but take the lock for 106 * consistency. 107 */ 108 WITH_QEMU_LOCK_GUARD(&s->requests_lock) { 109 QTAILQ_FOREACH_SAFE(req, &s->requests, next, next_req) { 110 fn(req, opaque); 111 } 112 } 113 } 114 115 typedef struct { 116 SCSIDevice *s; 117 void (*fn)(SCSIRequest *, void *); 118 void *fn_opaque; 119 } SCSIDeviceForEachReqAsyncData; 120 121 static void scsi_device_for_each_req_async_bh(void *opaque) 122 { 123 g_autofree SCSIDeviceForEachReqAsyncData *data = opaque; 124 SCSIDevice *s = data->s; 125 g_autoptr(GList) reqs = NULL; 126 127 /* 128 * Build a list of requests in this AioContext so fn() can be invoked later 129 * outside requests_lock. 130 */ 131 WITH_QEMU_LOCK_GUARD(&s->requests_lock) { 132 AioContext *ctx = qemu_get_current_aio_context(); 133 SCSIRequest *req; 134 SCSIRequest *next; 135 136 QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) { 137 if (req->ctx == ctx) { 138 scsi_req_ref(req); /* dropped after calling fn() */ 139 reqs = g_list_prepend(reqs, req); 140 } 141 } 142 } 143 144 /* Call fn() on each request */ 145 for (GList *elem = g_list_first(reqs); elem; elem = g_list_next(elem)) { 146 data->fn(elem->data, data->fn_opaque); 147 scsi_req_unref(elem->data); 148 } 149 150 /* Drop the reference taken by scsi_device_for_each_req_async() */ 151 object_unref(OBJECT(s)); 152 153 /* Paired with blk_inc_in_flight() in scsi_device_for_each_req_async() */ 154 blk_dec_in_flight(s->conf.blk); 155 } 156 157 static void scsi_device_for_each_req_async_do_ctx(gpointer key, gpointer value, 158 gpointer user_data) 159 { 160 AioContext *ctx = key; 161 SCSIDeviceForEachReqAsyncData *params = user_data; 162 SCSIDeviceForEachReqAsyncData *data; 163 164 data = g_new(SCSIDeviceForEachReqAsyncData, 1); 165 data->s = params->s; 166 data->fn = params->fn; 167 data->fn_opaque = params->fn_opaque; 168 169 /* 170 * Hold a reference to the SCSIDevice until 171 * scsi_device_for_each_req_async_bh() finishes. 172 */ 173 object_ref(OBJECT(data->s)); 174 175 /* Paired with scsi_device_for_each_req_async_bh() */ 176 blk_inc_in_flight(data->s->conf.blk); 177 178 aio_bh_schedule_oneshot(ctx, scsi_device_for_each_req_async_bh, data); 179 } 180 181 /* 182 * Schedule @fn() to be invoked for each enqueued request in device @s. @fn() 183 * must be thread-safe because it runs concurrently in each AioContext that is 184 * executing a request. 185 * 186 * Keeps the BlockBackend's in-flight counter incremented until everything is 187 * done, so draining it will settle all scheduled @fn() calls. 188 */ 189 static void scsi_device_for_each_req_async(SCSIDevice *s, 190 void (*fn)(SCSIRequest *, void *), 191 void *opaque) 192 { 193 assert(qemu_in_main_thread()); 194 195 /* The set of AioContexts where the requests are being processed */ 196 g_autoptr(GHashTable) aio_contexts = g_hash_table_new(NULL, NULL); 197 WITH_QEMU_LOCK_GUARD(&s->requests_lock) { 198 SCSIRequest *req; 199 QTAILQ_FOREACH(req, &s->requests, next) { 200 g_hash_table_add(aio_contexts, req->ctx); 201 } 202 } 203 204 /* Schedule a BH for each AioContext */ 205 SCSIDeviceForEachReqAsyncData params = { 206 .s = s, 207 .fn = fn, 208 .fn_opaque = opaque, 209 }; 210 g_hash_table_foreach( 211 aio_contexts, 212 scsi_device_for_each_req_async_do_ctx, 213 ¶ms 214 ); 215 } 216 217 static void scsi_device_realize(SCSIDevice *s, Error **errp) 218 { 219 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 220 if (sc->realize) { 221 sc->realize(s, errp); 222 } 223 } 224 225 static void scsi_device_unrealize(SCSIDevice *s) 226 { 227 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 228 if (sc->unrealize) { 229 sc->unrealize(s); 230 } 231 } 232 233 int scsi_bus_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf, 234 size_t buf_len, void *hba_private) 235 { 236 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 237 int rc; 238 239 assert(cmd->len == 0); 240 rc = scsi_req_parse_cdb(dev, cmd, buf, buf_len); 241 if (bus->info->parse_cdb) { 242 rc = bus->info->parse_cdb(dev, cmd, buf, buf_len, hba_private); 243 } 244 return rc; 245 } 246 247 static SCSIRequest *scsi_device_alloc_req(SCSIDevice *s, uint32_t tag, uint32_t lun, 248 uint8_t *buf, void *hba_private) 249 { 250 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 251 if (sc->alloc_req) { 252 return sc->alloc_req(s, tag, lun, buf, hba_private); 253 } 254 255 return NULL; 256 } 257 258 void scsi_device_unit_attention_reported(SCSIDevice *s) 259 { 260 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); 261 if (sc->unit_attention_reported) { 262 sc->unit_attention_reported(s); 263 } 264 } 265 266 /* Create a scsi bus, and attach devices to it. */ 267 void scsi_bus_init_named(SCSIBus *bus, size_t bus_size, DeviceState *host, 268 const SCSIBusInfo *info, const char *bus_name) 269 { 270 qbus_init(bus, bus_size, TYPE_SCSI_BUS, host, bus_name); 271 bus->busnr = next_scsi_bus++; 272 bus->info = info; 273 qbus_set_bus_hotplug_handler(BUS(bus)); 274 } 275 276 void scsi_req_retry(SCSIRequest *req) 277 { 278 req->retry = true; 279 } 280 281 /* Called in the AioContext that is executing the request */ 282 static void scsi_dma_restart_req(SCSIRequest *req, void *opaque) 283 { 284 scsi_req_ref(req); 285 if (req->retry) { 286 req->retry = false; 287 switch (req->cmd.mode) { 288 case SCSI_XFER_FROM_DEV: 289 case SCSI_XFER_TO_DEV: 290 scsi_req_continue(req); 291 break; 292 case SCSI_XFER_NONE: 293 scsi_req_dequeue(req); 294 scsi_req_enqueue(req); 295 break; 296 } 297 } 298 scsi_req_unref(req); 299 } 300 301 static void scsi_dma_restart_cb(void *opaque, bool running, RunState state) 302 { 303 SCSIDevice *s = opaque; 304 305 assert(qemu_in_main_thread()); 306 307 if (!running) { 308 return; 309 } 310 311 scsi_device_for_each_req_async(s, scsi_dma_restart_req, NULL); 312 } 313 314 static bool scsi_bus_is_address_free(SCSIBus *bus, 315 int channel, int target, int lun, 316 SCSIDevice **p_dev) 317 { 318 SCSIDevice *d; 319 320 RCU_READ_LOCK_GUARD(); 321 d = do_scsi_device_find(bus, channel, target, lun, true); 322 if (d && d->lun == lun) { 323 if (p_dev) { 324 *p_dev = d; 325 } 326 return false; 327 } 328 if (p_dev) { 329 *p_dev = NULL; 330 } 331 return true; 332 } 333 334 static bool scsi_bus_check_address(BusState *qbus, DeviceState *qdev, Error **errp) 335 { 336 SCSIDevice *dev = SCSI_DEVICE(qdev); 337 SCSIBus *bus = SCSI_BUS(qbus); 338 339 if (dev->channel > bus->info->max_channel) { 340 error_setg(errp, "bad scsi channel id: %d", dev->channel); 341 return false; 342 } 343 if (dev->id != -1 && dev->id > bus->info->max_target) { 344 error_setg(errp, "bad scsi device id: %d", dev->id); 345 return false; 346 } 347 if (dev->lun != -1 && dev->lun > bus->info->max_lun) { 348 error_setg(errp, "bad scsi device lun: %d", dev->lun); 349 return false; 350 } 351 352 if (dev->id != -1 && dev->lun != -1) { 353 SCSIDevice *d; 354 if (!scsi_bus_is_address_free(bus, dev->channel, dev->id, dev->lun, &d)) { 355 error_setg(errp, "lun already used by '%s'", d->qdev.id); 356 return false; 357 } 358 } 359 360 return true; 361 } 362 363 static void scsi_qdev_realize(DeviceState *qdev, Error **errp) 364 { 365 SCSIDevice *dev = SCSI_DEVICE(qdev); 366 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 367 bool is_free; 368 Error *local_err = NULL; 369 370 if (dev->id == -1) { 371 int id = -1; 372 if (dev->lun == -1) { 373 dev->lun = 0; 374 } 375 do { 376 is_free = scsi_bus_is_address_free(bus, dev->channel, ++id, dev->lun, NULL); 377 } while (!is_free && id < bus->info->max_target); 378 if (!is_free) { 379 error_setg(errp, "no free target"); 380 return; 381 } 382 dev->id = id; 383 } else if (dev->lun == -1) { 384 int lun = -1; 385 do { 386 is_free = scsi_bus_is_address_free(bus, dev->channel, dev->id, ++lun, NULL); 387 } while (!is_free && lun < bus->info->max_lun); 388 if (!is_free) { 389 error_setg(errp, "no free lun"); 390 return; 391 } 392 dev->lun = lun; 393 } 394 395 qemu_mutex_init(&dev->requests_lock); 396 QTAILQ_INIT(&dev->requests); 397 scsi_device_realize(dev, &local_err); 398 if (local_err) { 399 error_propagate(errp, local_err); 400 return; 401 } 402 dev->vmsentry = qdev_add_vm_change_state_handler(DEVICE(dev), 403 scsi_dma_restart_cb, NULL, dev); 404 } 405 406 static void scsi_qdev_unrealize(DeviceState *qdev) 407 { 408 SCSIDevice *dev = SCSI_DEVICE(qdev); 409 410 if (dev->vmsentry) { 411 qemu_del_vm_change_state_handler(dev->vmsentry); 412 } 413 414 scsi_device_purge_requests(dev, SENSE_CODE(NO_SENSE)); 415 416 qemu_mutex_destroy(&dev->requests_lock); 417 418 scsi_device_unrealize(dev); 419 420 blockdev_mark_auto_del(dev->conf.blk); 421 } 422 423 /* handle legacy '-drive if=scsi,...' cmd line args */ 424 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk, 425 int unit, bool removable, BlockConf *conf, 426 const char *serial, Error **errp) 427 { 428 const char *driver; 429 char *name; 430 DeviceState *dev; 431 SCSIDevice *s; 432 DriveInfo *dinfo; 433 Error *local_err = NULL; 434 435 if (blk_is_sg(blk)) { 436 driver = "scsi-generic"; 437 } else { 438 dinfo = blk_legacy_dinfo(blk); 439 if (dinfo && dinfo->media_cd) { 440 driver = "scsi-cd"; 441 } else { 442 driver = "scsi-hd"; 443 } 444 } 445 dev = qdev_new(driver); 446 name = g_strdup_printf("legacy[%d]", unit); 447 object_property_add_child(OBJECT(bus), name, OBJECT(dev)); 448 g_free(name); 449 450 s = SCSI_DEVICE(dev); 451 s->conf = *conf; 452 453 check_boot_index(conf->bootindex, &local_err); 454 if (local_err) { 455 object_unparent(OBJECT(dev)); 456 error_propagate(errp, local_err); 457 return NULL; 458 } 459 add_boot_device_path(conf->bootindex, dev, NULL); 460 461 qdev_prop_set_uint32(dev, "scsi-id", unit); 462 if (object_property_find(OBJECT(dev), "removable")) { 463 qdev_prop_set_bit(dev, "removable", removable); 464 } 465 if (serial && object_property_find(OBJECT(dev), "serial")) { 466 qdev_prop_set_string(dev, "serial", serial); 467 } 468 if (!qdev_prop_set_drive_err(dev, "drive", blk, errp)) { 469 object_unparent(OBJECT(dev)); 470 return NULL; 471 } 472 473 if (!qdev_realize_and_unref(dev, &bus->qbus, errp)) { 474 object_unparent(OBJECT(dev)); 475 return NULL; 476 } 477 return s; 478 } 479 480 void scsi_bus_legacy_handle_cmdline(SCSIBus *bus) 481 { 482 Location loc; 483 DriveInfo *dinfo; 484 int unit; 485 BlockConf conf = { 486 .bootindex = -1, 487 .share_rw = false, 488 .rerror = BLOCKDEV_ON_ERROR_AUTO, 489 .werror = BLOCKDEV_ON_ERROR_AUTO, 490 }; 491 492 loc_push_none(&loc); 493 for (unit = 0; unit <= bus->info->max_target; unit++) { 494 dinfo = drive_get(IF_SCSI, bus->busnr, unit); 495 if (dinfo == NULL) { 496 continue; 497 } 498 qemu_opts_loc_restore(dinfo->opts); 499 scsi_bus_legacy_add_drive(bus, blk_by_legacy_dinfo(dinfo), 500 unit, false, &conf, NULL, &error_fatal); 501 } 502 loc_pop(&loc); 503 } 504 505 static int32_t scsi_invalid_field(SCSIRequest *req, uint8_t *buf) 506 { 507 scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD)); 508 scsi_req_complete(req, CHECK_CONDITION); 509 return 0; 510 } 511 512 static const struct SCSIReqOps reqops_invalid_field = { 513 .size = sizeof(SCSIRequest), 514 .send_command = scsi_invalid_field 515 }; 516 517 /* SCSIReqOps implementation for invalid commands. */ 518 519 static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf) 520 { 521 scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE)); 522 scsi_req_complete(req, CHECK_CONDITION); 523 return 0; 524 } 525 526 static const struct SCSIReqOps reqops_invalid_opcode = { 527 .size = sizeof(SCSIRequest), 528 .send_command = scsi_invalid_command 529 }; 530 531 /* SCSIReqOps implementation for unit attention conditions. */ 532 533 static void scsi_fetch_unit_attention_sense(SCSIRequest *req) 534 { 535 SCSISense *ua = NULL; 536 537 if (req->dev->unit_attention.key == UNIT_ATTENTION) { 538 ua = &req->dev->unit_attention; 539 } else if (req->bus->unit_attention.key == UNIT_ATTENTION) { 540 ua = &req->bus->unit_attention; 541 } 542 543 /* 544 * Fetch the unit attention sense immediately so that another 545 * scsi_req_new does not use reqops_unit_attention. 546 */ 547 if (ua) { 548 scsi_req_build_sense(req, *ua); 549 *ua = SENSE_CODE(NO_SENSE); 550 } 551 } 552 553 static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf) 554 { 555 scsi_req_complete(req, CHECK_CONDITION); 556 return 0; 557 } 558 559 static const struct SCSIReqOps reqops_unit_attention = { 560 .size = sizeof(SCSIRequest), 561 .init_req = scsi_fetch_unit_attention_sense, 562 .send_command = scsi_unit_attention 563 }; 564 565 /* SCSIReqOps implementation for REPORT LUNS and for commands sent to 566 an invalid LUN. */ 567 568 typedef struct SCSITargetReq SCSITargetReq; 569 570 struct SCSITargetReq { 571 SCSIRequest req; 572 int len; 573 uint8_t *buf; 574 int buf_len; 575 }; 576 577 static void store_lun(uint8_t *outbuf, int lun) 578 { 579 if (lun < 256) { 580 /* Simple logical unit addressing method*/ 581 outbuf[0] = 0; 582 outbuf[1] = lun; 583 } else { 584 /* Flat space addressing method */ 585 outbuf[0] = 0x40 | (lun >> 8); 586 outbuf[1] = (lun & 255); 587 } 588 } 589 590 static bool scsi_target_emulate_report_luns(SCSITargetReq *r) 591 { 592 BusChild *kid; 593 int channel, id; 594 uint8_t tmp[8] = {0}; 595 int len = 0; 596 GByteArray *buf; 597 598 if (r->req.cmd.xfer < 16) { 599 return false; 600 } 601 if (r->req.cmd.buf[2] > 2) { 602 return false; 603 } 604 605 /* reserve space for 63 LUNs*/ 606 buf = g_byte_array_sized_new(512); 607 608 channel = r->req.dev->channel; 609 id = r->req.dev->id; 610 611 /* add size (will be updated later to correct value */ 612 g_byte_array_append(buf, tmp, 8); 613 len += 8; 614 615 /* add LUN0 */ 616 g_byte_array_append(buf, tmp, 8); 617 len += 8; 618 619 WITH_RCU_READ_LOCK_GUARD() { 620 QTAILQ_FOREACH_RCU(kid, &r->req.bus->qbus.children, sibling) { 621 DeviceState *qdev = kid->child; 622 SCSIDevice *dev = SCSI_DEVICE(qdev); 623 624 if (dev->channel == channel && dev->id == id && dev->lun != 0 && 625 qdev_is_realized(&dev->qdev)) { 626 store_lun(tmp, dev->lun); 627 g_byte_array_append(buf, tmp, 8); 628 len += 8; 629 } 630 } 631 } 632 633 r->buf_len = len; 634 r->buf = g_byte_array_free(buf, FALSE); 635 r->len = MIN(len, r->req.cmd.xfer & ~7); 636 637 /* store the LUN list length */ 638 stl_be_p(&r->buf[0], len - 8); 639 640 /* 641 * If a REPORT LUNS command enters the enabled command state, [...] 642 * the device server shall clear any pending unit attention condition 643 * with an additional sense code of REPORTED LUNS DATA HAS CHANGED. 644 */ 645 scsi_clear_reported_luns_changed(&r->req); 646 647 return true; 648 } 649 650 static bool scsi_target_emulate_inquiry(SCSITargetReq *r) 651 { 652 assert(r->req.dev->lun != r->req.lun); 653 654 scsi_target_alloc_buf(&r->req, SCSI_INQUIRY_LEN); 655 656 if (r->req.cmd.buf[1] & 0x2) { 657 /* Command support data - optional, not implemented */ 658 return false; 659 } 660 661 if (r->req.cmd.buf[1] & 0x1) { 662 /* Vital product data */ 663 uint8_t page_code = r->req.cmd.buf[2]; 664 r->buf[r->len++] = page_code ; /* this page */ 665 r->buf[r->len++] = 0x00; 666 667 switch (page_code) { 668 case 0x00: /* Supported page codes, mandatory */ 669 { 670 int pages; 671 pages = r->len++; 672 r->buf[r->len++] = 0x00; /* list of supported pages (this page) */ 673 r->buf[pages] = r->len - pages - 1; /* number of pages */ 674 break; 675 } 676 default: 677 return false; 678 } 679 /* done with EVPD */ 680 assert(r->len < r->buf_len); 681 r->len = MIN(r->req.cmd.xfer, r->len); 682 return true; 683 } 684 685 /* Standard INQUIRY data */ 686 if (r->req.cmd.buf[2] != 0) { 687 return false; 688 } 689 690 /* PAGE CODE == 0 */ 691 r->len = MIN(r->req.cmd.xfer, SCSI_INQUIRY_LEN); 692 memset(r->buf, 0, r->len); 693 if (r->req.lun != 0) { 694 r->buf[0] = TYPE_NO_LUN; 695 } else { 696 r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE; 697 r->buf[2] = 5; /* Version */ 698 r->buf[3] = 2 | 0x10; /* HiSup, response data format */ 699 r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */ 700 r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ. */ 701 memcpy(&r->buf[8], "QEMU ", 8); 702 memcpy(&r->buf[16], "QEMU TARGET ", 16); 703 pstrcpy((char *) &r->buf[32], 4, qemu_hw_version()); 704 } 705 return true; 706 } 707 708 static size_t scsi_sense_len(SCSIRequest *req) 709 { 710 if (req->dev->type == TYPE_SCANNER) 711 return SCSI_SENSE_LEN_SCANNER; 712 else 713 return SCSI_SENSE_LEN; 714 } 715 716 static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf) 717 { 718 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 719 int fixed_sense = (req->cmd.buf[1] & 1) == 0; 720 721 if (req->lun != 0 && 722 buf[0] != INQUIRY && buf[0] != REQUEST_SENSE) { 723 scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED)); 724 scsi_req_complete(req, CHECK_CONDITION); 725 return 0; 726 } 727 switch (buf[0]) { 728 case REPORT_LUNS: 729 if (!scsi_target_emulate_report_luns(r)) { 730 goto illegal_request; 731 } 732 break; 733 case INQUIRY: 734 if (!scsi_target_emulate_inquiry(r)) { 735 goto illegal_request; 736 } 737 break; 738 case REQUEST_SENSE: 739 scsi_target_alloc_buf(&r->req, scsi_sense_len(req)); 740 if (req->lun != 0) { 741 const struct SCSISense sense = SENSE_CODE(LUN_NOT_SUPPORTED); 742 743 r->len = scsi_build_sense_buf(r->buf, req->cmd.xfer, 744 sense, fixed_sense); 745 } else { 746 r->len = scsi_device_get_sense(r->req.dev, r->buf, 747 MIN(req->cmd.xfer, r->buf_len), 748 fixed_sense); 749 } 750 if (r->req.dev->sense_is_ua) { 751 scsi_device_unit_attention_reported(req->dev); 752 r->req.dev->sense_len = 0; 753 r->req.dev->sense_is_ua = false; 754 } 755 break; 756 case TEST_UNIT_READY: 757 break; 758 default: 759 scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE)); 760 scsi_req_complete(req, CHECK_CONDITION); 761 return 0; 762 illegal_request: 763 scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD)); 764 scsi_req_complete(req, CHECK_CONDITION); 765 return 0; 766 } 767 768 if (!r->len) { 769 scsi_req_complete(req, GOOD); 770 } 771 return r->len; 772 } 773 774 static void scsi_target_read_data(SCSIRequest *req) 775 { 776 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 777 uint32_t n; 778 779 n = r->len; 780 if (n > 0) { 781 r->len = 0; 782 scsi_req_data(&r->req, n); 783 } else { 784 scsi_req_complete(&r->req, GOOD); 785 } 786 } 787 788 static uint8_t *scsi_target_get_buf(SCSIRequest *req) 789 { 790 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 791 792 return r->buf; 793 } 794 795 static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len) 796 { 797 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 798 799 r->buf = g_malloc(len); 800 r->buf_len = len; 801 802 return r->buf; 803 } 804 805 static void scsi_target_free_buf(SCSIRequest *req) 806 { 807 SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req); 808 809 g_free(r->buf); 810 } 811 812 static const struct SCSIReqOps reqops_target_command = { 813 .size = sizeof(SCSITargetReq), 814 .send_command = scsi_target_send_command, 815 .read_data = scsi_target_read_data, 816 .get_buf = scsi_target_get_buf, 817 .free_req = scsi_target_free_buf, 818 }; 819 820 821 SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d, 822 uint32_t tag, uint32_t lun, void *hba_private) 823 { 824 SCSIRequest *req; 825 SCSIBus *bus = scsi_bus_from_device(d); 826 const int memset_off = offsetof(SCSIRequest, sense) 827 + sizeof(req->sense); 828 829 req = g_malloc(reqops->size); 830 memset((uint8_t *)req + memset_off, 0, reqops->size - memset_off); 831 req->refcount = 1; 832 req->bus = bus; 833 req->dev = d; 834 req->tag = tag; 835 req->lun = lun; 836 req->hba_private = hba_private; 837 req->status = -1; 838 req->host_status = -1; 839 req->ops = reqops; 840 notifier_list_init(&req->cancel_notifiers); 841 842 if (reqops->init_req) { 843 reqops->init_req(req); 844 } 845 846 trace_scsi_req_alloc(req->dev->id, req->lun, req->tag); 847 return req; 848 } 849 850 SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun, 851 uint8_t *buf, size_t buf_len, void *hba_private) 852 { 853 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus); 854 const SCSIReqOps *ops; 855 SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(d); 856 SCSIRequest *req; 857 SCSICommand cmd = { .len = 0 }; 858 int ret; 859 860 if (buf_len == 0) { 861 trace_scsi_req_parse_bad(d->id, lun, tag, 0); 862 goto invalid_opcode; 863 } 864 865 if ((d->unit_attention.key == UNIT_ATTENTION || 866 bus->unit_attention.key == UNIT_ATTENTION) && 867 (buf[0] != INQUIRY && 868 buf[0] != REPORT_LUNS && 869 buf[0] != GET_CONFIGURATION && 870 buf[0] != GET_EVENT_STATUS_NOTIFICATION && 871 872 /* 873 * If we already have a pending unit attention condition, 874 * report this one before triggering another one. 875 */ 876 !(buf[0] == REQUEST_SENSE && d->sense_is_ua))) { 877 ops = &reqops_unit_attention; 878 } else if (lun != d->lun || 879 buf[0] == REPORT_LUNS || 880 (buf[0] == REQUEST_SENSE && d->sense_len)) { 881 ops = &reqops_target_command; 882 } else { 883 ops = NULL; 884 } 885 886 if (ops != NULL || !sc->parse_cdb) { 887 ret = scsi_req_parse_cdb(d, &cmd, buf, buf_len); 888 } else { 889 ret = sc->parse_cdb(d, &cmd, buf, buf_len, hba_private); 890 } 891 892 if (ret != 0) { 893 trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]); 894 invalid_opcode: 895 req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private); 896 } else { 897 assert(cmd.len != 0); 898 trace_scsi_req_parsed(d->id, lun, tag, buf[0], 899 cmd.mode, cmd.xfer); 900 if (cmd.lba != -1) { 901 trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0], 902 cmd.lba); 903 } 904 905 if (cmd.xfer > INT32_MAX) { 906 req = scsi_req_alloc(&reqops_invalid_field, d, tag, lun, hba_private); 907 } else if (ops) { 908 req = scsi_req_alloc(ops, d, tag, lun, hba_private); 909 } else { 910 req = scsi_device_alloc_req(d, tag, lun, buf, hba_private); 911 } 912 } 913 914 req->ctx = qemu_get_current_aio_context(); 915 req->cmd = cmd; 916 req->residual = req->cmd.xfer; 917 918 switch (buf[0]) { 919 case INQUIRY: 920 trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]); 921 break; 922 case TEST_UNIT_READY: 923 trace_scsi_test_unit_ready(d->id, lun, tag); 924 break; 925 case REPORT_LUNS: 926 trace_scsi_report_luns(d->id, lun, tag); 927 break; 928 case REQUEST_SENSE: 929 trace_scsi_request_sense(d->id, lun, tag); 930 break; 931 default: 932 break; 933 } 934 935 return req; 936 } 937 938 uint8_t *scsi_req_get_buf(SCSIRequest *req) 939 { 940 return req->ops->get_buf(req); 941 } 942 943 static void scsi_clear_reported_luns_changed(SCSIRequest *req) 944 { 945 SCSISense *ua; 946 947 if (req->dev->unit_attention.key == UNIT_ATTENTION) { 948 ua = &req->dev->unit_attention; 949 } else if (req->bus->unit_attention.key == UNIT_ATTENTION) { 950 ua = &req->bus->unit_attention; 951 } else { 952 return; 953 } 954 955 if (ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc && 956 ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq) { 957 *ua = SENSE_CODE(NO_SENSE); 958 } 959 } 960 961 int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len) 962 { 963 int ret; 964 965 assert(len >= 14); 966 if (!req->sense_len) { 967 return 0; 968 } 969 970 ret = scsi_convert_sense(req->sense, req->sense_len, buf, len, true); 971 972 /* 973 * FIXME: clearing unit attention conditions upon autosense should be done 974 * only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b 975 * (SAM-5, 5.14). 976 * 977 * We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and 978 * 10b for HBAs that do not support it (do not call scsi_req_get_sense). 979 * Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b. 980 */ 981 if (req->dev->sense_is_ua) { 982 scsi_device_unit_attention_reported(req->dev); 983 req->dev->sense_len = 0; 984 req->dev->sense_is_ua = false; 985 } 986 return ret; 987 } 988 989 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed) 990 { 991 return scsi_convert_sense(dev->sense, dev->sense_len, buf, len, fixed); 992 } 993 994 void scsi_req_build_sense(SCSIRequest *req, SCSISense sense) 995 { 996 trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag, 997 sense.key, sense.asc, sense.ascq); 998 req->sense_len = scsi_build_sense(req->sense, sense); 999 } 1000 1001 static void scsi_req_enqueue_internal(SCSIRequest *req) 1002 { 1003 assert(!req->enqueued); 1004 scsi_req_ref(req); 1005 if (req->bus->info->get_sg_list) { 1006 req->sg = req->bus->info->get_sg_list(req); 1007 } else { 1008 req->sg = NULL; 1009 } 1010 req->enqueued = true; 1011 1012 WITH_QEMU_LOCK_GUARD(&req->dev->requests_lock) { 1013 QTAILQ_INSERT_TAIL(&req->dev->requests, req, next); 1014 } 1015 } 1016 1017 int32_t scsi_req_enqueue(SCSIRequest *req) 1018 { 1019 int32_t rc; 1020 1021 assert(!req->retry); 1022 scsi_req_enqueue_internal(req); 1023 scsi_req_ref(req); 1024 rc = req->ops->send_command(req, req->cmd.buf); 1025 scsi_req_unref(req); 1026 return rc; 1027 } 1028 1029 static void scsi_req_dequeue(SCSIRequest *req) 1030 { 1031 trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag); 1032 req->retry = false; 1033 if (req->enqueued) { 1034 WITH_QEMU_LOCK_GUARD(&req->dev->requests_lock) { 1035 QTAILQ_REMOVE(&req->dev->requests, req, next); 1036 } 1037 req->enqueued = false; 1038 scsi_req_unref(req); 1039 } 1040 } 1041 1042 static int scsi_get_performance_length(int num_desc, int type, int data_type) 1043 { 1044 /* MMC-6, paragraph 6.7. */ 1045 switch (type) { 1046 case 0: 1047 if ((data_type & 3) == 0) { 1048 /* Each descriptor is as in Table 295 - Nominal performance. */ 1049 return 16 * num_desc + 8; 1050 } else { 1051 /* Each descriptor is as in Table 296 - Exceptions. */ 1052 return 6 * num_desc + 8; 1053 } 1054 case 1: 1055 case 4: 1056 case 5: 1057 return 8 * num_desc + 8; 1058 case 2: 1059 return 2048 * num_desc + 8; 1060 case 3: 1061 return 16 * num_desc + 8; 1062 default: 1063 return 8; 1064 } 1065 } 1066 1067 static int ata_passthrough_xfer_unit(SCSIDevice *dev, uint8_t *buf) 1068 { 1069 int byte_block = (buf[2] >> 2) & 0x1; 1070 int type = (buf[2] >> 4) & 0x1; 1071 int xfer_unit; 1072 1073 if (byte_block) { 1074 if (type) { 1075 xfer_unit = dev->blocksize; 1076 } else { 1077 xfer_unit = 512; 1078 } 1079 } else { 1080 xfer_unit = 1; 1081 } 1082 1083 return xfer_unit; 1084 } 1085 1086 static int ata_passthrough_12_xfer(SCSIDevice *dev, uint8_t *buf) 1087 { 1088 int length = buf[2] & 0x3; 1089 int xfer; 1090 int unit = ata_passthrough_xfer_unit(dev, buf); 1091 1092 switch (length) { 1093 case 0: 1094 case 3: /* USB-specific. */ 1095 default: 1096 xfer = 0; 1097 break; 1098 case 1: 1099 xfer = buf[3]; 1100 break; 1101 case 2: 1102 xfer = buf[4]; 1103 break; 1104 } 1105 1106 return xfer * unit; 1107 } 1108 1109 static int ata_passthrough_16_xfer(SCSIDevice *dev, uint8_t *buf) 1110 { 1111 int extend = buf[1] & 0x1; 1112 int length = buf[2] & 0x3; 1113 int xfer; 1114 int unit = ata_passthrough_xfer_unit(dev, buf); 1115 1116 switch (length) { 1117 case 0: 1118 case 3: /* USB-specific. */ 1119 default: 1120 xfer = 0; 1121 break; 1122 case 1: 1123 xfer = buf[4]; 1124 xfer |= (extend ? buf[3] << 8 : 0); 1125 break; 1126 case 2: 1127 xfer = buf[6]; 1128 xfer |= (extend ? buf[5] << 8 : 0); 1129 break; 1130 } 1131 1132 return xfer * unit; 1133 } 1134 1135 static int scsi_req_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1136 { 1137 cmd->xfer = scsi_cdb_xfer(buf); 1138 switch (buf[0]) { 1139 case TEST_UNIT_READY: 1140 case REWIND: 1141 case START_STOP: 1142 case SET_CAPACITY: 1143 case WRITE_FILEMARKS: 1144 case WRITE_FILEMARKS_16: 1145 case SPACE: 1146 case RESERVE: 1147 case RELEASE: 1148 case ERASE: 1149 case ALLOW_MEDIUM_REMOVAL: 1150 case SEEK_10: 1151 case SYNCHRONIZE_CACHE: 1152 case SYNCHRONIZE_CACHE_16: 1153 case LOCATE_16: 1154 case LOCK_UNLOCK_CACHE: 1155 case SET_CD_SPEED: 1156 case SET_LIMITS: 1157 case WRITE_LONG_10: 1158 case UPDATE_BLOCK: 1159 case RESERVE_TRACK: 1160 case SET_READ_AHEAD: 1161 case PRE_FETCH: 1162 case PRE_FETCH_16: 1163 case ALLOW_OVERWRITE: 1164 cmd->xfer = 0; 1165 break; 1166 case VERIFY_10: 1167 case VERIFY_12: 1168 case VERIFY_16: 1169 if ((buf[1] & 2) == 0) { 1170 cmd->xfer = 0; 1171 } else if ((buf[1] & 4) != 0) { 1172 cmd->xfer = 1; 1173 } 1174 cmd->xfer *= dev->blocksize; 1175 break; 1176 case MODE_SENSE: 1177 break; 1178 case WRITE_SAME_10: 1179 case WRITE_SAME_16: 1180 cmd->xfer = buf[1] & 1 ? 0 : dev->blocksize; 1181 break; 1182 case READ_CAPACITY_10: 1183 cmd->xfer = 8; 1184 break; 1185 case READ_BLOCK_LIMITS: 1186 cmd->xfer = 6; 1187 break; 1188 case SEND_VOLUME_TAG: 1189 /* GPCMD_SET_STREAMING from multimedia commands. */ 1190 if (dev->type == TYPE_ROM) { 1191 cmd->xfer = buf[10] | (buf[9] << 8); 1192 } else { 1193 cmd->xfer = buf[9] | (buf[8] << 8); 1194 } 1195 break; 1196 case WRITE_6: 1197 /* length 0 means 256 blocks */ 1198 if (cmd->xfer == 0) { 1199 cmd->xfer = 256; 1200 } 1201 /* fall through */ 1202 case WRITE_10: 1203 case WRITE_VERIFY_10: 1204 case WRITE_12: 1205 case WRITE_VERIFY_12: 1206 case WRITE_16: 1207 case WRITE_VERIFY_16: 1208 cmd->xfer *= dev->blocksize; 1209 break; 1210 case READ_6: 1211 case READ_REVERSE: 1212 /* length 0 means 256 blocks */ 1213 if (cmd->xfer == 0) { 1214 cmd->xfer = 256; 1215 } 1216 /* fall through */ 1217 case READ_10: 1218 case READ_12: 1219 case READ_16: 1220 cmd->xfer *= dev->blocksize; 1221 break; 1222 case FORMAT_UNIT: 1223 /* MMC mandates the parameter list to be 12-bytes long. Parameters 1224 * for block devices are restricted to the header right now. */ 1225 if (dev->type == TYPE_ROM && (buf[1] & 16)) { 1226 cmd->xfer = 12; 1227 } else { 1228 cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4); 1229 } 1230 break; 1231 case INQUIRY: 1232 case RECEIVE_DIAGNOSTIC: 1233 case SEND_DIAGNOSTIC: 1234 cmd->xfer = buf[4] | (buf[3] << 8); 1235 break; 1236 case READ_CD: 1237 case READ_BUFFER: 1238 case WRITE_BUFFER: 1239 case SEND_CUE_SHEET: 1240 cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16); 1241 break; 1242 case PERSISTENT_RESERVE_OUT: 1243 cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL; 1244 break; 1245 case ERASE_12: 1246 if (dev->type == TYPE_ROM) { 1247 /* MMC command GET PERFORMANCE. */ 1248 cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8), 1249 buf[10], buf[1] & 0x1f); 1250 } 1251 break; 1252 case MECHANISM_STATUS: 1253 case READ_DVD_STRUCTURE: 1254 case SEND_DVD_STRUCTURE: 1255 case MAINTENANCE_OUT: 1256 case MAINTENANCE_IN: 1257 if (dev->type == TYPE_ROM) { 1258 /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */ 1259 cmd->xfer = buf[9] | (buf[8] << 8); 1260 } 1261 break; 1262 case ATA_PASSTHROUGH_12: 1263 if (dev->type == TYPE_ROM) { 1264 /* BLANK command of MMC */ 1265 cmd->xfer = 0; 1266 } else { 1267 cmd->xfer = ata_passthrough_12_xfer(dev, buf); 1268 } 1269 break; 1270 case ATA_PASSTHROUGH_16: 1271 cmd->xfer = ata_passthrough_16_xfer(dev, buf); 1272 break; 1273 } 1274 return 0; 1275 } 1276 1277 static int scsi_req_stream_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1278 { 1279 switch (buf[0]) { 1280 /* stream commands */ 1281 case ERASE_12: 1282 case ERASE_16: 1283 cmd->xfer = 0; 1284 break; 1285 case READ_6: 1286 case READ_REVERSE: 1287 case RECOVER_BUFFERED_DATA: 1288 case WRITE_6: 1289 cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16); 1290 if (buf[1] & 0x01) { /* fixed */ 1291 cmd->xfer *= dev->blocksize; 1292 } 1293 break; 1294 case READ_16: 1295 case READ_REVERSE_16: 1296 case VERIFY_16: 1297 case WRITE_16: 1298 cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16); 1299 if (buf[1] & 0x01) { /* fixed */ 1300 cmd->xfer *= dev->blocksize; 1301 } 1302 break; 1303 case REWIND: 1304 case LOAD_UNLOAD: 1305 cmd->xfer = 0; 1306 break; 1307 case SPACE_16: 1308 cmd->xfer = buf[13] | (buf[12] << 8); 1309 break; 1310 case READ_POSITION: 1311 switch (buf[1] & 0x1f) /* operation code */ { 1312 case SHORT_FORM_BLOCK_ID: 1313 case SHORT_FORM_VENDOR_SPECIFIC: 1314 cmd->xfer = 20; 1315 break; 1316 case LONG_FORM: 1317 cmd->xfer = 32; 1318 break; 1319 case EXTENDED_FORM: 1320 cmd->xfer = buf[8] | (buf[7] << 8); 1321 break; 1322 default: 1323 return -1; 1324 } 1325 1326 break; 1327 case FORMAT_UNIT: 1328 cmd->xfer = buf[4] | (buf[3] << 8); 1329 break; 1330 /* generic commands */ 1331 default: 1332 return scsi_req_xfer(cmd, dev, buf); 1333 } 1334 return 0; 1335 } 1336 1337 static int scsi_req_medium_changer_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1338 { 1339 switch (buf[0]) { 1340 /* medium changer commands */ 1341 case EXCHANGE_MEDIUM: 1342 case INITIALIZE_ELEMENT_STATUS: 1343 case INITIALIZE_ELEMENT_STATUS_WITH_RANGE: 1344 case MOVE_MEDIUM: 1345 case POSITION_TO_ELEMENT: 1346 cmd->xfer = 0; 1347 break; 1348 case READ_ELEMENT_STATUS: 1349 cmd->xfer = buf[9] | (buf[8] << 8) | (buf[7] << 16); 1350 break; 1351 1352 /* generic commands */ 1353 default: 1354 return scsi_req_xfer(cmd, dev, buf); 1355 } 1356 return 0; 1357 } 1358 1359 static int scsi_req_scanner_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf) 1360 { 1361 switch (buf[0]) { 1362 /* Scanner commands */ 1363 case OBJECT_POSITION: 1364 cmd->xfer = 0; 1365 break; 1366 case SCAN: 1367 cmd->xfer = buf[4]; 1368 break; 1369 case READ_10: 1370 case SEND: 1371 case GET_WINDOW: 1372 case SET_WINDOW: 1373 cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16); 1374 break; 1375 default: 1376 /* GET_DATA_BUFFER_STATUS xfer handled by scsi_req_xfer */ 1377 return scsi_req_xfer(cmd, dev, buf); 1378 } 1379 1380 return 0; 1381 } 1382 1383 static void scsi_cmd_xfer_mode(SCSICommand *cmd) 1384 { 1385 if (!cmd->xfer) { 1386 cmd->mode = SCSI_XFER_NONE; 1387 return; 1388 } 1389 switch (cmd->buf[0]) { 1390 case WRITE_6: 1391 case WRITE_10: 1392 case WRITE_VERIFY_10: 1393 case WRITE_12: 1394 case WRITE_VERIFY_12: 1395 case WRITE_16: 1396 case WRITE_VERIFY_16: 1397 case VERIFY_10: 1398 case VERIFY_12: 1399 case VERIFY_16: 1400 case COPY: 1401 case COPY_VERIFY: 1402 case COMPARE: 1403 case CHANGE_DEFINITION: 1404 case LOG_SELECT: 1405 case MODE_SELECT: 1406 case MODE_SELECT_10: 1407 case SEND_DIAGNOSTIC: 1408 case WRITE_BUFFER: 1409 case FORMAT_UNIT: 1410 case REASSIGN_BLOCKS: 1411 case SEARCH_EQUAL: 1412 case SEARCH_HIGH: 1413 case SEARCH_LOW: 1414 case UPDATE_BLOCK: 1415 case WRITE_LONG_10: 1416 case WRITE_SAME_10: 1417 case WRITE_SAME_16: 1418 case UNMAP: 1419 case SEARCH_HIGH_12: 1420 case SEARCH_EQUAL_12: 1421 case SEARCH_LOW_12: 1422 case MEDIUM_SCAN: 1423 case SEND_VOLUME_TAG: 1424 case SEND_CUE_SHEET: 1425 case SEND_DVD_STRUCTURE: 1426 case PERSISTENT_RESERVE_OUT: 1427 case MAINTENANCE_OUT: 1428 case SET_WINDOW: 1429 case SCAN: 1430 /* SCAN conflicts with START_STOP. START_STOP has cmd->xfer set to 0 for 1431 * non-scanner devices, so we only get here for SCAN and not for START_STOP. 1432 */ 1433 cmd->mode = SCSI_XFER_TO_DEV; 1434 break; 1435 case ATA_PASSTHROUGH_12: 1436 case ATA_PASSTHROUGH_16: 1437 /* T_DIR */ 1438 cmd->mode = (cmd->buf[2] & 0x8) ? 1439 SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV; 1440 break; 1441 default: 1442 cmd->mode = SCSI_XFER_FROM_DEV; 1443 break; 1444 } 1445 } 1446 1447 int scsi_req_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf, 1448 size_t buf_len) 1449 { 1450 int rc; 1451 int len; 1452 1453 cmd->lba = -1; 1454 len = scsi_cdb_length(buf); 1455 if (len < 0 || len > buf_len) { 1456 return -1; 1457 } 1458 1459 cmd->len = len; 1460 switch (dev->type) { 1461 case TYPE_TAPE: 1462 rc = scsi_req_stream_xfer(cmd, dev, buf); 1463 break; 1464 case TYPE_MEDIUM_CHANGER: 1465 rc = scsi_req_medium_changer_xfer(cmd, dev, buf); 1466 break; 1467 case TYPE_SCANNER: 1468 rc = scsi_req_scanner_length(cmd, dev, buf); 1469 break; 1470 default: 1471 rc = scsi_req_xfer(cmd, dev, buf); 1472 break; 1473 } 1474 1475 if (rc != 0) 1476 return rc; 1477 1478 memcpy(cmd->buf, buf, cmd->len); 1479 scsi_cmd_xfer_mode(cmd); 1480 cmd->lba = scsi_cmd_lba(cmd); 1481 return 0; 1482 } 1483 1484 void scsi_device_report_change(SCSIDevice *dev, SCSISense sense) 1485 { 1486 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus); 1487 1488 scsi_device_set_ua(dev, sense); 1489 if (bus->info->change) { 1490 bus->info->change(bus, dev, sense); 1491 } 1492 } 1493 1494 SCSIRequest *scsi_req_ref(SCSIRequest *req) 1495 { 1496 assert(qatomic_read(&req->refcount) > 0); 1497 qatomic_inc(&req->refcount); 1498 return req; 1499 } 1500 1501 void scsi_req_unref(SCSIRequest *req) 1502 { 1503 assert(qatomic_read(&req->refcount) > 0); 1504 if (qatomic_fetch_dec(&req->refcount) == 1) { 1505 BusState *qbus = req->dev->qdev.parent_bus; 1506 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, qbus); 1507 1508 if (bus->info->free_request && req->hba_private) { 1509 bus->info->free_request(bus, req->hba_private); 1510 } 1511 if (req->ops->free_req) { 1512 req->ops->free_req(req); 1513 } 1514 g_free(req); 1515 } 1516 } 1517 1518 /* Tell the device that we finished processing this chunk of I/O. It 1519 will start the next chunk or complete the command. */ 1520 void scsi_req_continue(SCSIRequest *req) 1521 { 1522 if (req->io_canceled) { 1523 trace_scsi_req_continue_canceled(req->dev->id, req->lun, req->tag); 1524 return; 1525 } 1526 trace_scsi_req_continue(req->dev->id, req->lun, req->tag); 1527 if (req->cmd.mode == SCSI_XFER_TO_DEV) { 1528 req->ops->write_data(req); 1529 } else { 1530 req->ops->read_data(req); 1531 } 1532 } 1533 1534 /* Called by the devices when data is ready for the HBA. The HBA should 1535 start a DMA operation to read or fill the device's data buffer. 1536 Once it completes, calling scsi_req_continue will restart I/O. */ 1537 void scsi_req_data(SCSIRequest *req, int len) 1538 { 1539 uint8_t *buf; 1540 if (req->io_canceled) { 1541 trace_scsi_req_data_canceled(req->dev->id, req->lun, req->tag, len); 1542 return; 1543 } 1544 trace_scsi_req_data(req->dev->id, req->lun, req->tag, len); 1545 assert(req->cmd.mode != SCSI_XFER_NONE); 1546 if (!req->sg) { 1547 req->residual -= len; 1548 req->bus->info->transfer_data(req, len); 1549 return; 1550 } 1551 1552 /* If the device calls scsi_req_data and the HBA specified a 1553 * scatter/gather list, the transfer has to happen in a single 1554 * step. */ 1555 assert(!req->dma_started); 1556 req->dma_started = true; 1557 1558 buf = scsi_req_get_buf(req); 1559 if (req->cmd.mode == SCSI_XFER_FROM_DEV) { 1560 dma_buf_read(buf, len, &req->residual, req->sg, 1561 MEMTXATTRS_UNSPECIFIED); 1562 } else { 1563 dma_buf_write(buf, len, &req->residual, req->sg, 1564 MEMTXATTRS_UNSPECIFIED); 1565 } 1566 scsi_req_continue(req); 1567 } 1568 1569 void scsi_req_print(SCSIRequest *req) 1570 { 1571 FILE *fp = stderr; 1572 int i; 1573 1574 fprintf(fp, "[%s id=%d] %s", 1575 req->dev->qdev.parent_bus->name, 1576 req->dev->id, 1577 scsi_command_name(req->cmd.buf[0])); 1578 for (i = 1; i < req->cmd.len; i++) { 1579 fprintf(fp, " 0x%02x", req->cmd.buf[i]); 1580 } 1581 switch (req->cmd.mode) { 1582 case SCSI_XFER_NONE: 1583 fprintf(fp, " - none\n"); 1584 break; 1585 case SCSI_XFER_FROM_DEV: 1586 fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer); 1587 break; 1588 case SCSI_XFER_TO_DEV: 1589 fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer); 1590 break; 1591 default: 1592 fprintf(fp, " - Oops\n"); 1593 break; 1594 } 1595 } 1596 1597 void scsi_req_complete_failed(SCSIRequest *req, int host_status) 1598 { 1599 SCSISense sense; 1600 int status; 1601 1602 assert(req->status == -1 && req->host_status == -1); 1603 assert(req->ops != &reqops_unit_attention); 1604 1605 if (!req->bus->info->fail) { 1606 status = scsi_sense_from_host_status(req->host_status, &sense); 1607 if (status == CHECK_CONDITION) { 1608 scsi_req_build_sense(req, sense); 1609 } 1610 scsi_req_complete(req, status); 1611 return; 1612 } 1613 1614 req->host_status = host_status; 1615 scsi_req_ref(req); 1616 scsi_req_dequeue(req); 1617 req->bus->info->fail(req); 1618 1619 /* Cancelled requests might end up being completed instead of cancelled */ 1620 notifier_list_notify(&req->cancel_notifiers, req); 1621 scsi_req_unref(req); 1622 } 1623 1624 void scsi_req_complete(SCSIRequest *req, int status) 1625 { 1626 assert(req->status == -1 && req->host_status == -1); 1627 req->status = status; 1628 req->host_status = SCSI_HOST_OK; 1629 1630 assert(req->sense_len <= sizeof(req->sense)); 1631 if (status == GOOD) { 1632 req->sense_len = 0; 1633 } 1634 1635 if (req->sense_len) { 1636 memcpy(req->dev->sense, req->sense, req->sense_len); 1637 req->dev->sense_len = req->sense_len; 1638 req->dev->sense_is_ua = (req->ops == &reqops_unit_attention); 1639 } else { 1640 req->dev->sense_len = 0; 1641 req->dev->sense_is_ua = false; 1642 } 1643 1644 scsi_req_ref(req); 1645 scsi_req_dequeue(req); 1646 req->bus->info->complete(req, req->residual); 1647 1648 /* Cancelled requests might end up being completed instead of cancelled */ 1649 notifier_list_notify(&req->cancel_notifiers, req); 1650 scsi_req_unref(req); 1651 } 1652 1653 /* Called by the devices when the request is canceled. */ 1654 void scsi_req_cancel_complete(SCSIRequest *req) 1655 { 1656 assert(req->io_canceled); 1657 if (req->bus->info->cancel) { 1658 req->bus->info->cancel(req); 1659 } 1660 notifier_list_notify(&req->cancel_notifiers, req); 1661 scsi_req_unref(req); 1662 } 1663 1664 /* Cancel @req asynchronously. @notifier is added to @req's cancellation 1665 * notifier list, the bus will be notified the requests cancellation is 1666 * completed. 1667 * */ 1668 void scsi_req_cancel_async(SCSIRequest *req, Notifier *notifier) 1669 { 1670 trace_scsi_req_cancel(req->dev->id, req->lun, req->tag); 1671 if (notifier) { 1672 notifier_list_add(&req->cancel_notifiers, notifier); 1673 } 1674 if (req->io_canceled) { 1675 /* A blk_aio_cancel_async is pending; when it finishes, 1676 * scsi_req_cancel_complete will be called and will 1677 * call the notifier we just added. Just wait for that. 1678 */ 1679 assert(req->aiocb); 1680 return; 1681 } 1682 /* Dropped in scsi_req_cancel_complete. */ 1683 scsi_req_ref(req); 1684 scsi_req_dequeue(req); 1685 req->io_canceled = true; 1686 if (req->aiocb) { 1687 blk_aio_cancel_async(req->aiocb); 1688 } else { 1689 scsi_req_cancel_complete(req); 1690 } 1691 } 1692 1693 void scsi_req_cancel(SCSIRequest *req) 1694 { 1695 trace_scsi_req_cancel(req->dev->id, req->lun, req->tag); 1696 if (!req->enqueued) { 1697 return; 1698 } 1699 assert(!req->io_canceled); 1700 /* Dropped in scsi_req_cancel_complete. */ 1701 scsi_req_ref(req); 1702 scsi_req_dequeue(req); 1703 req->io_canceled = true; 1704 if (req->aiocb) { 1705 blk_aio_cancel(req->aiocb); 1706 } else { 1707 scsi_req_cancel_complete(req); 1708 } 1709 } 1710 1711 static int scsi_ua_precedence(SCSISense sense) 1712 { 1713 if (sense.key != UNIT_ATTENTION) { 1714 return INT_MAX; 1715 } 1716 if (sense.asc == 0x29 && sense.ascq == 0x04) { 1717 /* DEVICE INTERNAL RESET goes with POWER ON OCCURRED */ 1718 return 1; 1719 } else if (sense.asc == 0x3F && sense.ascq == 0x01) { 1720 /* MICROCODE HAS BEEN CHANGED goes with SCSI BUS RESET OCCURRED */ 1721 return 2; 1722 } else if (sense.asc == 0x29 && (sense.ascq == 0x05 || sense.ascq == 0x06)) { 1723 /* These two go with "all others". */ 1724 ; 1725 } else if (sense.asc == 0x29 && sense.ascq <= 0x07) { 1726 /* POWER ON, RESET OR BUS DEVICE RESET OCCURRED = 0 1727 * POWER ON OCCURRED = 1 1728 * SCSI BUS RESET OCCURRED = 2 1729 * BUS DEVICE RESET FUNCTION OCCURRED = 3 1730 * I_T NEXUS LOSS OCCURRED = 7 1731 */ 1732 return sense.ascq; 1733 } else if (sense.asc == 0x2F && sense.ascq == 0x01) { 1734 /* COMMANDS CLEARED BY POWER LOSS NOTIFICATION */ 1735 return 8; 1736 } 1737 return (sense.asc << 8) | sense.ascq; 1738 } 1739 1740 void scsi_bus_set_ua(SCSIBus *bus, SCSISense sense) 1741 { 1742 int prec1, prec2; 1743 if (sense.key != UNIT_ATTENTION) { 1744 return; 1745 } 1746 1747 /* 1748 * Override a pre-existing unit attention condition, except for a more 1749 * important reset condition. 1750 */ 1751 prec1 = scsi_ua_precedence(bus->unit_attention); 1752 prec2 = scsi_ua_precedence(sense); 1753 if (prec2 < prec1) { 1754 bus->unit_attention = sense; 1755 } 1756 } 1757 1758 void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense) 1759 { 1760 int prec1, prec2; 1761 if (sense.key != UNIT_ATTENTION) { 1762 return; 1763 } 1764 trace_scsi_device_set_ua(sdev->id, sdev->lun, sense.key, 1765 sense.asc, sense.ascq); 1766 1767 /* 1768 * Override a pre-existing unit attention condition, except for a more 1769 * important reset condition. 1770 */ 1771 prec1 = scsi_ua_precedence(sdev->unit_attention); 1772 prec2 = scsi_ua_precedence(sense); 1773 if (prec2 < prec1) { 1774 sdev->unit_attention = sense; 1775 } 1776 } 1777 1778 static void scsi_device_purge_one_req(SCSIRequest *req, void *opaque) 1779 { 1780 scsi_req_cancel_async(req, NULL); 1781 } 1782 1783 /** 1784 * Cancel all requests, and block until they are deleted. 1785 */ 1786 void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense) 1787 { 1788 scsi_device_for_each_req_async(sdev, scsi_device_purge_one_req, NULL); 1789 1790 /* 1791 * Await all the scsi_device_purge_one_req() calls scheduled by 1792 * scsi_device_for_each_req_async(), and all I/O requests that were 1793 * cancelled this way, but may still take a bit of time to settle. 1794 */ 1795 blk_drain(sdev->conf.blk); 1796 1797 scsi_device_set_ua(sdev, sense); 1798 } 1799 1800 void scsi_device_drained_begin(SCSIDevice *sdev) 1801 { 1802 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, sdev->qdev.parent_bus); 1803 if (!bus) { 1804 return; 1805 } 1806 1807 assert(qemu_get_current_aio_context() == qemu_get_aio_context()); 1808 assert(bus->drain_count < INT_MAX); 1809 1810 /* 1811 * Multiple BlockBackends can be on a SCSIBus and each may begin/end 1812 * draining at any time. Keep a counter so HBAs only see begin/end once. 1813 */ 1814 if (bus->drain_count++ == 0) { 1815 trace_scsi_bus_drained_begin(bus, sdev); 1816 if (bus->info->drained_begin) { 1817 bus->info->drained_begin(bus); 1818 } 1819 } 1820 } 1821 1822 void scsi_device_drained_end(SCSIDevice *sdev) 1823 { 1824 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, sdev->qdev.parent_bus); 1825 if (!bus) { 1826 return; 1827 } 1828 1829 assert(qemu_get_current_aio_context() == qemu_get_aio_context()); 1830 assert(bus->drain_count > 0); 1831 1832 if (bus->drain_count-- == 1) { 1833 trace_scsi_bus_drained_end(bus, sdev); 1834 if (bus->info->drained_end) { 1835 bus->info->drained_end(bus); 1836 } 1837 } 1838 } 1839 1840 static char *scsibus_get_dev_path(DeviceState *dev) 1841 { 1842 SCSIDevice *d = SCSI_DEVICE(dev); 1843 DeviceState *hba = dev->parent_bus->parent; 1844 char *id; 1845 char *path; 1846 1847 id = qdev_get_dev_path(hba); 1848 if (id) { 1849 path = g_strdup_printf("%s/%d:%d:%d", id, d->channel, d->id, d->lun); 1850 } else { 1851 path = g_strdup_printf("%d:%d:%d", d->channel, d->id, d->lun); 1852 } 1853 g_free(id); 1854 return path; 1855 } 1856 1857 static char *scsibus_get_fw_dev_path(DeviceState *dev) 1858 { 1859 SCSIDevice *d = SCSI_DEVICE(dev); 1860 return g_strdup_printf("channel@%x/%s@%x,%x", d->channel, 1861 qdev_fw_name(dev), d->id, d->lun); 1862 } 1863 1864 /* SCSI request list. For simplicity, pv points to the whole device */ 1865 1866 static void put_scsi_req(SCSIRequest *req, void *opaque) 1867 { 1868 QEMUFile *f = opaque; 1869 1870 assert(!req->io_canceled); 1871 assert(req->status == -1 && req->host_status == -1); 1872 assert(req->enqueued); 1873 1874 qemu_put_sbyte(f, req->retry ? 1 : 2); 1875 qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf)); 1876 qemu_put_be32s(f, &req->tag); 1877 qemu_put_be32s(f, &req->lun); 1878 if (req->bus->info->save_request) { 1879 req->bus->info->save_request(f, req); 1880 } 1881 if (req->ops->save_request) { 1882 req->ops->save_request(f, req); 1883 } 1884 } 1885 1886 static int put_scsi_requests(QEMUFile *f, void *pv, size_t size, 1887 const VMStateField *field, JSONWriter *vmdesc) 1888 { 1889 SCSIDevice *s = pv; 1890 1891 scsi_device_for_each_req_sync(s, put_scsi_req, f); 1892 qemu_put_sbyte(f, 0); 1893 return 0; 1894 } 1895 1896 static int get_scsi_requests(QEMUFile *f, void *pv, size_t size, 1897 const VMStateField *field) 1898 { 1899 SCSIDevice *s = pv; 1900 SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus); 1901 int8_t sbyte; 1902 1903 while ((sbyte = qemu_get_sbyte(f)) > 0) { 1904 uint8_t buf[SCSI_CMD_BUF_SIZE]; 1905 uint32_t tag; 1906 uint32_t lun; 1907 SCSIRequest *req; 1908 1909 qemu_get_buffer(f, buf, sizeof(buf)); 1910 qemu_get_be32s(f, &tag); 1911 qemu_get_be32s(f, &lun); 1912 /* 1913 * A too-short CDB would have been rejected by scsi_req_new, so just use 1914 * SCSI_CMD_BUF_SIZE as the CDB length. 1915 */ 1916 req = scsi_req_new(s, tag, lun, buf, sizeof(buf), NULL); 1917 req->retry = (sbyte == 1); 1918 if (bus->info->load_request) { 1919 req->hba_private = bus->info->load_request(f, req); 1920 } 1921 if (req->ops->load_request) { 1922 req->ops->load_request(f, req); 1923 } 1924 1925 /* Just restart it later. */ 1926 scsi_req_enqueue_internal(req); 1927 1928 /* At this point, the request will be kept alive by the reference 1929 * added by scsi_req_enqueue_internal, so we can release our reference. 1930 * The HBA of course will add its own reference in the load_request 1931 * callback if it needs to hold on the SCSIRequest. 1932 */ 1933 scsi_req_unref(req); 1934 } 1935 1936 return 0; 1937 } 1938 1939 static const VMStateInfo vmstate_info_scsi_requests = { 1940 .name = "scsi-requests", 1941 .get = get_scsi_requests, 1942 .put = put_scsi_requests, 1943 }; 1944 1945 static bool scsi_sense_state_needed(void *opaque) 1946 { 1947 SCSIDevice *s = opaque; 1948 1949 return s->sense_len > SCSI_SENSE_BUF_SIZE_OLD; 1950 } 1951 1952 static const VMStateDescription vmstate_scsi_sense_state = { 1953 .name = "SCSIDevice/sense", 1954 .version_id = 1, 1955 .minimum_version_id = 1, 1956 .needed = scsi_sense_state_needed, 1957 .fields = (const VMStateField[]) { 1958 VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice, 1959 SCSI_SENSE_BUF_SIZE_OLD, 1960 SCSI_SENSE_BUF_SIZE - SCSI_SENSE_BUF_SIZE_OLD), 1961 VMSTATE_END_OF_LIST() 1962 } 1963 }; 1964 1965 const VMStateDescription vmstate_scsi_device = { 1966 .name = "SCSIDevice", 1967 .version_id = 1, 1968 .minimum_version_id = 1, 1969 .fields = (const VMStateField[]) { 1970 VMSTATE_UINT8(unit_attention.key, SCSIDevice), 1971 VMSTATE_UINT8(unit_attention.asc, SCSIDevice), 1972 VMSTATE_UINT8(unit_attention.ascq, SCSIDevice), 1973 VMSTATE_BOOL(sense_is_ua, SCSIDevice), 1974 VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice, 0, SCSI_SENSE_BUF_SIZE_OLD), 1975 VMSTATE_UINT32(sense_len, SCSIDevice), 1976 { 1977 .name = "requests", 1978 .version_id = 0, 1979 .field_exists = NULL, 1980 .size = 0, /* ouch */ 1981 .info = &vmstate_info_scsi_requests, 1982 .flags = VMS_SINGLE, 1983 .offset = 0, 1984 }, 1985 VMSTATE_END_OF_LIST() 1986 }, 1987 .subsections = (const VMStateDescription * const []) { 1988 &vmstate_scsi_sense_state, 1989 NULL 1990 } 1991 }; 1992 1993 static const Property scsi_props[] = { 1994 DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0), 1995 DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1), 1996 DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1), 1997 }; 1998 1999 static void scsi_device_class_init(ObjectClass *klass, const void *data) 2000 { 2001 DeviceClass *k = DEVICE_CLASS(klass); 2002 set_bit(DEVICE_CATEGORY_STORAGE, k->categories); 2003 k->bus_type = TYPE_SCSI_BUS; 2004 k->realize = scsi_qdev_realize; 2005 k->unrealize = scsi_qdev_unrealize; 2006 device_class_set_props(k, scsi_props); 2007 } 2008 2009 static void scsi_dev_instance_init(Object *obj) 2010 { 2011 SCSIDevice *s = SCSI_DEVICE(obj); 2012 2013 device_add_bootindex_property(obj, &s->conf.bootindex, 2014 "bootindex", NULL, 2015 &s->qdev); 2016 } 2017 2018 static const TypeInfo scsi_device_type_info = { 2019 .name = TYPE_SCSI_DEVICE, 2020 .parent = TYPE_DEVICE, 2021 .instance_size = sizeof(SCSIDevice), 2022 .abstract = true, 2023 .class_size = sizeof(SCSIDeviceClass), 2024 .class_init = scsi_device_class_init, 2025 .instance_init = scsi_dev_instance_init, 2026 }; 2027 2028 static void scsi_bus_class_init(ObjectClass *klass, const void *data) 2029 { 2030 BusClass *k = BUS_CLASS(klass); 2031 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 2032 2033 k->get_dev_path = scsibus_get_dev_path; 2034 k->get_fw_dev_path = scsibus_get_fw_dev_path; 2035 k->check_address = scsi_bus_check_address; 2036 hc->unplug = qdev_simple_device_unplug_cb; 2037 } 2038 2039 static const TypeInfo scsi_bus_info = { 2040 .name = TYPE_SCSI_BUS, 2041 .parent = TYPE_BUS, 2042 .instance_size = sizeof(SCSIBus), 2043 .class_init = scsi_bus_class_init, 2044 .interfaces = (const InterfaceInfo[]) { 2045 { TYPE_HOTPLUG_HANDLER }, 2046 { } 2047 } 2048 }; 2049 2050 static void scsi_register_types(void) 2051 { 2052 type_register_static(&scsi_bus_info); 2053 type_register_static(&scsi_device_type_info); 2054 } 2055 2056 type_init(scsi_register_types) 2057