1 /* 2 * Virtio SCSI HBA 3 * 4 * Copyright IBM, Corp. 2010 5 * Copyright Red Hat, Inc. 2011 6 * 7 * Authors: 8 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 9 * Paolo Bonzini <pbonzini@redhat.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or later. 12 * See the COPYING file in the top-level directory. 13 * 14 */ 15 16 #include "qemu/osdep.h" 17 #include "qapi/error.h" 18 #include "standard-headers/linux/virtio_ids.h" 19 #include "hw/virtio/virtio-scsi.h" 20 #include "migration/qemu-file-types.h" 21 #include "qemu/error-report.h" 22 #include "qemu/iov.h" 23 #include "qemu/module.h" 24 #include "sysemu/block-backend.h" 25 #include "sysemu/dma.h" 26 #include "hw/qdev-properties.h" 27 #include "hw/scsi/scsi.h" 28 #include "scsi/constants.h" 29 #include "hw/virtio/virtio-bus.h" 30 #include "hw/virtio/virtio-access.h" 31 #include "trace.h" 32 33 typedef struct VirtIOSCSIReq { 34 /* 35 * Note: 36 * - fields up to resp_iov are initialized by virtio_scsi_init_req; 37 * - fields starting at vring are zeroed by virtio_scsi_init_req. 38 */ 39 VirtQueueElement elem; 40 41 VirtIOSCSI *dev; 42 VirtQueue *vq; 43 QEMUSGList qsgl; 44 QEMUIOVector resp_iov; 45 46 /* Used for two-stage request submission and TMFs deferred to BH */ 47 QTAILQ_ENTRY(VirtIOSCSIReq) next; 48 49 /* Used for cancellation of request during TMFs */ 50 int remaining; 51 52 SCSIRequest *sreq; 53 size_t resp_size; 54 enum SCSIXferMode mode; 55 union { 56 VirtIOSCSICmdResp cmd; 57 VirtIOSCSICtrlTMFResp tmf; 58 VirtIOSCSICtrlANResp an; 59 VirtIOSCSIEvent event; 60 } resp; 61 union { 62 VirtIOSCSICmdReq cmd; 63 VirtIOSCSICtrlTMFReq tmf; 64 VirtIOSCSICtrlANReq an; 65 } req; 66 } VirtIOSCSIReq; 67 68 static inline int virtio_scsi_get_lun(uint8_t *lun) 69 { 70 return ((lun[2] << 8) | lun[3]) & 0x3FFF; 71 } 72 73 static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun) 74 { 75 if (lun[0] != 1) { 76 return NULL; 77 } 78 if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { 79 return NULL; 80 } 81 return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); 82 } 83 84 static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) 85 { 86 VirtIODevice *vdev = VIRTIO_DEVICE(s); 87 const size_t zero_skip = 88 offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov); 89 90 req->vq = vq; 91 req->dev = s; 92 qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as); 93 qemu_iovec_init(&req->resp_iov, 1); 94 memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip); 95 } 96 97 static void virtio_scsi_free_req(VirtIOSCSIReq *req) 98 { 99 qemu_iovec_destroy(&req->resp_iov); 100 qemu_sglist_destroy(&req->qsgl); 101 g_free(req); 102 } 103 104 static void virtio_scsi_complete_req(VirtIOSCSIReq *req) 105 { 106 VirtIOSCSI *s = req->dev; 107 VirtQueue *vq = req->vq; 108 VirtIODevice *vdev = VIRTIO_DEVICE(s); 109 110 qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); 111 virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); 112 if (s->dataplane_started && !s->dataplane_fenced) { 113 virtio_notify_irqfd(vdev, vq); 114 } else { 115 virtio_notify(vdev, vq); 116 } 117 118 if (req->sreq) { 119 req->sreq->hba_private = NULL; 120 scsi_req_unref(req->sreq); 121 } 122 virtio_scsi_free_req(req); 123 } 124 125 static void virtio_scsi_bad_req(VirtIOSCSIReq *req) 126 { 127 virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers"); 128 virtqueue_detach_element(req->vq, &req->elem, 0); 129 virtio_scsi_free_req(req); 130 } 131 132 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, 133 hwaddr *addr, int num, size_t skip) 134 { 135 QEMUSGList *qsgl = &req->qsgl; 136 size_t copied = 0; 137 138 while (num) { 139 if (skip >= iov->iov_len) { 140 skip -= iov->iov_len; 141 } else { 142 qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); 143 copied += iov->iov_len - skip; 144 skip = 0; 145 } 146 iov++; 147 addr++; 148 num--; 149 } 150 151 assert(skip == 0); 152 return copied; 153 } 154 155 static int virtio_scsi_parse_req(VirtIOSCSIReq *req, 156 unsigned req_size, unsigned resp_size) 157 { 158 VirtIODevice *vdev = (VirtIODevice *) req->dev; 159 size_t in_size, out_size; 160 161 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 162 &req->req, req_size) < req_size) { 163 return -EINVAL; 164 } 165 166 if (qemu_iovec_concat_iov(&req->resp_iov, 167 req->elem.in_sg, req->elem.in_num, 0, 168 resp_size) < resp_size) { 169 return -EINVAL; 170 } 171 172 req->resp_size = resp_size; 173 174 /* Old BIOSes left some padding by mistake after the req_size/resp_size. 175 * As a workaround, always consider the first buffer as the virtio-scsi 176 * request/response, making the payload start at the second element 177 * of the iovec. 178 * 179 * The actual length of the response header, stored in req->resp_size, 180 * does not change. 181 * 182 * TODO: always disable this workaround for virtio 1.0 devices. 183 */ 184 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) { 185 if (req->elem.out_num) { 186 req_size = req->elem.out_sg[0].iov_len; 187 } 188 if (req->elem.in_num) { 189 resp_size = req->elem.in_sg[0].iov_len; 190 } 191 } 192 193 out_size = qemu_sgl_concat(req, req->elem.out_sg, 194 &req->elem.out_addr[0], req->elem.out_num, 195 req_size); 196 in_size = qemu_sgl_concat(req, req->elem.in_sg, 197 &req->elem.in_addr[0], req->elem.in_num, 198 resp_size); 199 200 if (out_size && in_size) { 201 return -ENOTSUP; 202 } 203 204 if (out_size) { 205 req->mode = SCSI_XFER_TO_DEV; 206 } else if (in_size) { 207 req->mode = SCSI_XFER_FROM_DEV; 208 } 209 210 return 0; 211 } 212 213 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) 214 { 215 VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s; 216 VirtIOSCSIReq *req; 217 218 req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size); 219 if (!req) { 220 return NULL; 221 } 222 virtio_scsi_init_req(s, vq, req); 223 return req; 224 } 225 226 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) 227 { 228 VirtIOSCSIReq *req = sreq->hba_private; 229 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); 230 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 231 uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED; 232 233 assert(n < vs->conf.num_queues); 234 qemu_put_be32s(f, &n); 235 qemu_put_virtqueue_element(vdev, f, &req->elem); 236 } 237 238 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) 239 { 240 SCSIBus *bus = sreq->bus; 241 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 242 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 243 VirtIODevice *vdev = VIRTIO_DEVICE(s); 244 VirtIOSCSIReq *req; 245 uint32_t n; 246 247 qemu_get_be32s(f, &n); 248 assert(n < vs->conf.num_queues); 249 req = qemu_get_virtqueue_element(vdev, f, 250 sizeof(VirtIOSCSIReq) + vs->cdb_size); 251 virtio_scsi_init_req(s, vs->cmd_vqs[n], req); 252 253 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 254 sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { 255 error_report("invalid SCSI request migration data"); 256 exit(1); 257 } 258 259 scsi_req_ref(sreq); 260 req->sreq = sreq; 261 if (req->sreq->cmd.mode != SCSI_XFER_NONE) { 262 assert(req->sreq->cmd.mode == req->mode); 263 } 264 return req; 265 } 266 267 typedef struct { 268 Notifier notifier; 269 VirtIOSCSIReq *tmf_req; 270 } VirtIOSCSICancelNotifier; 271 272 static void virtio_scsi_cancel_notify(Notifier *notifier, void *data) 273 { 274 VirtIOSCSICancelNotifier *n = container_of(notifier, 275 VirtIOSCSICancelNotifier, 276 notifier); 277 278 if (--n->tmf_req->remaining == 0) { 279 VirtIOSCSIReq *req = n->tmf_req; 280 281 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), 282 req->req.tmf.tag, req->resp.tmf.response); 283 virtio_scsi_complete_req(req); 284 } 285 g_free(n); 286 } 287 288 static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d) 289 { 290 if (s->dataplane_started && d && blk_is_available(d->conf.blk)) { 291 assert(blk_get_aio_context(d->conf.blk) == s->ctx); 292 } 293 } 294 295 static void virtio_scsi_do_one_tmf_bh(VirtIOSCSIReq *req) 296 { 297 VirtIOSCSI *s = req->dev; 298 SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); 299 BusChild *kid; 300 int target; 301 302 switch (req->req.tmf.subtype) { 303 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 304 if (!d) { 305 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 306 goto out; 307 } 308 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 309 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 310 goto out; 311 } 312 qatomic_inc(&s->resetting); 313 device_cold_reset(&d->qdev); 314 qatomic_dec(&s->resetting); 315 break; 316 317 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 318 target = req->req.tmf.lun[1]; 319 qatomic_inc(&s->resetting); 320 321 rcu_read_lock(); 322 QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) { 323 SCSIDevice *d1 = SCSI_DEVICE(kid->child); 324 if (d1->channel == 0 && d1->id == target) { 325 device_cold_reset(&d1->qdev); 326 } 327 } 328 rcu_read_unlock(); 329 330 qatomic_dec(&s->resetting); 331 break; 332 333 default: 334 g_assert_not_reached(); 335 break; 336 } 337 338 out: 339 object_unref(OBJECT(d)); 340 341 virtio_scsi_acquire(s); 342 virtio_scsi_complete_req(req); 343 virtio_scsi_release(s); 344 } 345 346 /* Some TMFs must be processed from the main loop thread */ 347 static void virtio_scsi_do_tmf_bh(void *opaque) 348 { 349 VirtIOSCSI *s = opaque; 350 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 351 VirtIOSCSIReq *req; 352 VirtIOSCSIReq *tmp; 353 354 GLOBAL_STATE_CODE(); 355 356 virtio_scsi_acquire(s); 357 358 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 359 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 360 QTAILQ_INSERT_TAIL(&reqs, req, next); 361 } 362 363 qemu_bh_delete(s->tmf_bh); 364 s->tmf_bh = NULL; 365 366 virtio_scsi_release(s); 367 368 QTAILQ_FOREACH_SAFE(req, &reqs, next, tmp) { 369 QTAILQ_REMOVE(&reqs, req, next); 370 virtio_scsi_do_one_tmf_bh(req); 371 } 372 } 373 374 static void virtio_scsi_reset_tmf_bh(VirtIOSCSI *s) 375 { 376 VirtIOSCSIReq *req; 377 VirtIOSCSIReq *tmp; 378 379 GLOBAL_STATE_CODE(); 380 381 virtio_scsi_acquire(s); 382 383 if (s->tmf_bh) { 384 qemu_bh_delete(s->tmf_bh); 385 s->tmf_bh = NULL; 386 } 387 388 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 389 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 390 391 /* SAM-6 6.3.2 Hard reset */ 392 req->resp.tmf.response = VIRTIO_SCSI_S_TARGET_FAILURE; 393 virtio_scsi_complete_req(req); 394 } 395 396 virtio_scsi_release(s); 397 } 398 399 static void virtio_scsi_defer_tmf_to_bh(VirtIOSCSIReq *req) 400 { 401 VirtIOSCSI *s = req->dev; 402 403 QTAILQ_INSERT_TAIL(&s->tmf_bh_list, req, next); 404 405 if (!s->tmf_bh) { 406 s->tmf_bh = qemu_bh_new(virtio_scsi_do_tmf_bh, s); 407 qemu_bh_schedule(s->tmf_bh); 408 } 409 } 410 411 /* Return 0 if the request is ready to be completed and return to guest; 412 * -EINPROGRESS if the request is submitted and will be completed later, in the 413 * case of async cancellation. */ 414 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) 415 { 416 SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); 417 SCSIRequest *r, *next; 418 int ret = 0; 419 420 virtio_scsi_ctx_check(s, d); 421 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ 422 req->resp.tmf.response = VIRTIO_SCSI_S_OK; 423 424 /* 425 * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() 426 * to avoid compiler errors. 427 */ 428 req->req.tmf.subtype = 429 virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); 430 431 trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun), 432 req->req.tmf.tag, req->req.tmf.subtype); 433 434 switch (req->req.tmf.subtype) { 435 case VIRTIO_SCSI_T_TMF_ABORT_TASK: 436 case VIRTIO_SCSI_T_TMF_QUERY_TASK: 437 if (!d) { 438 goto fail; 439 } 440 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 441 goto incorrect_lun; 442 } 443 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 444 VirtIOSCSIReq *cmd_req = r->hba_private; 445 if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { 446 break; 447 } 448 } 449 if (r) { 450 /* 451 * Assert that the request has not been completed yet, we 452 * check for it in the loop above. 453 */ 454 assert(r->hba_private); 455 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { 456 /* "If the specified command is present in the task set, then 457 * return a service response set to FUNCTION SUCCEEDED". 458 */ 459 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 460 } else { 461 VirtIOSCSICancelNotifier *notifier; 462 463 req->remaining = 1; 464 notifier = g_new(VirtIOSCSICancelNotifier, 1); 465 notifier->tmf_req = req; 466 notifier->notifier.notify = virtio_scsi_cancel_notify; 467 scsi_req_cancel_async(r, ¬ifier->notifier); 468 ret = -EINPROGRESS; 469 } 470 } 471 break; 472 473 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 474 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 475 virtio_scsi_defer_tmf_to_bh(req); 476 ret = -EINPROGRESS; 477 break; 478 479 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: 480 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: 481 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: 482 if (!d) { 483 goto fail; 484 } 485 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 486 goto incorrect_lun; 487 } 488 489 /* Add 1 to "remaining" until virtio_scsi_do_tmf returns. 490 * This way, if the bus starts calling back to the notifiers 491 * even before we finish the loop, virtio_scsi_cancel_notify 492 * will not complete the TMF too early. 493 */ 494 req->remaining = 1; 495 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 496 if (r->hba_private) { 497 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { 498 /* "If there is any command present in the task set, then 499 * return a service response set to FUNCTION SUCCEEDED". 500 */ 501 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 502 break; 503 } else { 504 VirtIOSCSICancelNotifier *notifier; 505 506 req->remaining++; 507 notifier = g_new(VirtIOSCSICancelNotifier, 1); 508 notifier->notifier.notify = virtio_scsi_cancel_notify; 509 notifier->tmf_req = req; 510 scsi_req_cancel_async(r, ¬ifier->notifier); 511 } 512 } 513 } 514 if (--req->remaining > 0) { 515 ret = -EINPROGRESS; 516 } 517 break; 518 519 case VIRTIO_SCSI_T_TMF_CLEAR_ACA: 520 default: 521 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; 522 break; 523 } 524 525 object_unref(OBJECT(d)); 526 return ret; 527 528 incorrect_lun: 529 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 530 object_unref(OBJECT(d)); 531 return ret; 532 533 fail: 534 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 535 object_unref(OBJECT(d)); 536 return ret; 537 } 538 539 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) 540 { 541 VirtIODevice *vdev = (VirtIODevice *)s; 542 uint32_t type; 543 int r = 0; 544 545 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 546 &type, sizeof(type)) < sizeof(type)) { 547 virtio_scsi_bad_req(req); 548 return; 549 } 550 551 virtio_tswap32s(vdev, &type); 552 if (type == VIRTIO_SCSI_T_TMF) { 553 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), 554 sizeof(VirtIOSCSICtrlTMFResp)) < 0) { 555 virtio_scsi_bad_req(req); 556 return; 557 } else { 558 r = virtio_scsi_do_tmf(s, req); 559 } 560 561 } else if (type == VIRTIO_SCSI_T_AN_QUERY || 562 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { 563 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), 564 sizeof(VirtIOSCSICtrlANResp)) < 0) { 565 virtio_scsi_bad_req(req); 566 return; 567 } else { 568 req->req.an.event_requested = 569 virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested); 570 trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun), 571 req->req.an.event_requested); 572 req->resp.an.event_actual = 0; 573 req->resp.an.response = VIRTIO_SCSI_S_OK; 574 } 575 } 576 if (r == 0) { 577 if (type == VIRTIO_SCSI_T_TMF) 578 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), 579 req->req.tmf.tag, 580 req->resp.tmf.response); 581 else if (type == VIRTIO_SCSI_T_AN_QUERY || 582 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) 583 trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun), 584 req->resp.an.response); 585 virtio_scsi_complete_req(req); 586 } else { 587 assert(r == -EINPROGRESS); 588 } 589 } 590 591 static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) 592 { 593 VirtIOSCSIReq *req; 594 595 while ((req = virtio_scsi_pop_req(s, vq))) { 596 virtio_scsi_handle_ctrl_req(s, req); 597 } 598 } 599 600 /* 601 * If dataplane is configured but not yet started, do so now and return true on 602 * success. 603 * 604 * Dataplane is started by the core virtio code but virtqueue handler functions 605 * can also be invoked when a guest kicks before DRIVER_OK, so this helper 606 * function helps us deal with manually starting ioeventfd in that case. 607 */ 608 static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s) 609 { 610 if (!s->ctx || s->dataplane_started) { 611 return false; 612 } 613 614 virtio_device_start_ioeventfd(&s->parent_obj.parent_obj); 615 return !s->dataplane_fenced; 616 } 617 618 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 619 { 620 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 621 622 if (virtio_scsi_defer_to_dataplane(s)) { 623 return; 624 } 625 626 virtio_scsi_acquire(s); 627 virtio_scsi_handle_ctrl_vq(s, vq); 628 virtio_scsi_release(s); 629 } 630 631 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) 632 { 633 trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun), 634 req->req.cmd.tag, 635 req->resp.cmd.response, 636 req->resp.cmd.status); 637 /* Sense data is not in req->resp and is copied separately 638 * in virtio_scsi_command_complete. 639 */ 640 req->resp_size = sizeof(VirtIOSCSICmdResp); 641 virtio_scsi_complete_req(req); 642 } 643 644 static void virtio_scsi_command_failed(SCSIRequest *r) 645 { 646 VirtIOSCSIReq *req = r->hba_private; 647 648 if (r->io_canceled) { 649 return; 650 } 651 652 req->resp.cmd.status = GOOD; 653 switch (r->host_status) { 654 case SCSI_HOST_NO_LUN: 655 req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN; 656 break; 657 case SCSI_HOST_BUSY: 658 req->resp.cmd.response = VIRTIO_SCSI_S_BUSY; 659 break; 660 case SCSI_HOST_TIME_OUT: 661 case SCSI_HOST_ABORTED: 662 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 663 break; 664 case SCSI_HOST_BAD_RESPONSE: 665 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 666 break; 667 case SCSI_HOST_RESET: 668 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 669 break; 670 case SCSI_HOST_TRANSPORT_DISRUPTED: 671 req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE; 672 break; 673 case SCSI_HOST_TARGET_FAILURE: 674 req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE; 675 break; 676 case SCSI_HOST_RESERVATION_ERROR: 677 req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE; 678 break; 679 case SCSI_HOST_ALLOCATION_FAILURE: 680 case SCSI_HOST_MEDIUM_ERROR: 681 case SCSI_HOST_ERROR: 682 default: 683 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 684 break; 685 } 686 virtio_scsi_complete_cmd_req(req); 687 } 688 689 static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid) 690 { 691 VirtIOSCSIReq *req = r->hba_private; 692 uint8_t sense[SCSI_SENSE_BUF_SIZE]; 693 uint32_t sense_len; 694 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 695 696 if (r->io_canceled) { 697 return; 698 } 699 700 req->resp.cmd.response = VIRTIO_SCSI_S_OK; 701 req->resp.cmd.status = r->status; 702 if (req->resp.cmd.status == GOOD) { 703 req->resp.cmd.resid = virtio_tswap32(vdev, resid); 704 } else { 705 req->resp.cmd.resid = 0; 706 sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); 707 sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); 708 qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), 709 sense, sense_len); 710 req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); 711 } 712 virtio_scsi_complete_cmd_req(req); 713 } 714 715 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, 716 uint8_t *buf, size_t buf_len, 717 void *hba_private) 718 { 719 VirtIOSCSIReq *req = hba_private; 720 721 if (cmd->len == 0) { 722 cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); 723 memcpy(cmd->buf, buf, cmd->len); 724 } 725 726 /* Extract the direction and mode directly from the request, for 727 * host device passthrough. 728 */ 729 cmd->xfer = req->qsgl.size; 730 cmd->mode = req->mode; 731 return 0; 732 } 733 734 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) 735 { 736 VirtIOSCSIReq *req = r->hba_private; 737 738 return &req->qsgl; 739 } 740 741 static void virtio_scsi_request_cancelled(SCSIRequest *r) 742 { 743 VirtIOSCSIReq *req = r->hba_private; 744 745 if (!req) { 746 return; 747 } 748 if (qatomic_read(&req->dev->resetting)) { 749 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 750 } else { 751 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 752 } 753 virtio_scsi_complete_cmd_req(req); 754 } 755 756 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) 757 { 758 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 759 virtio_scsi_complete_cmd_req(req); 760 } 761 762 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) 763 { 764 VirtIOSCSICommon *vs = &s->parent_obj; 765 SCSIDevice *d; 766 int rc; 767 768 rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 769 sizeof(VirtIOSCSICmdResp) + vs->sense_size); 770 if (rc < 0) { 771 if (rc == -ENOTSUP) { 772 virtio_scsi_fail_cmd_req(req); 773 return -ENOTSUP; 774 } else { 775 virtio_scsi_bad_req(req); 776 return -EINVAL; 777 } 778 } 779 trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun), 780 req->req.cmd.tag, req->req.cmd.cdb[0]); 781 782 d = virtio_scsi_device_get(s, req->req.cmd.lun); 783 if (!d) { 784 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 785 virtio_scsi_complete_cmd_req(req); 786 return -ENOENT; 787 } 788 virtio_scsi_ctx_check(s, d); 789 req->sreq = scsi_req_new(d, req->req.cmd.tag, 790 virtio_scsi_get_lun(req->req.cmd.lun), 791 req->req.cmd.cdb, vs->cdb_size, req); 792 793 if (req->sreq->cmd.mode != SCSI_XFER_NONE 794 && (req->sreq->cmd.mode != req->mode || 795 req->sreq->cmd.xfer > req->qsgl.size)) { 796 req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; 797 virtio_scsi_complete_cmd_req(req); 798 object_unref(OBJECT(d)); 799 return -ENOBUFS; 800 } 801 scsi_req_ref(req->sreq); 802 blk_io_plug(); 803 object_unref(OBJECT(d)); 804 return 0; 805 } 806 807 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) 808 { 809 SCSIRequest *sreq = req->sreq; 810 if (scsi_req_enqueue(sreq)) { 811 scsi_req_continue(sreq); 812 } 813 blk_io_unplug(); 814 scsi_req_unref(sreq); 815 } 816 817 static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) 818 { 819 VirtIOSCSIReq *req, *next; 820 int ret = 0; 821 bool suppress_notifications = virtio_queue_get_notification(vq); 822 823 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 824 825 do { 826 if (suppress_notifications) { 827 virtio_queue_set_notification(vq, 0); 828 } 829 830 while ((req = virtio_scsi_pop_req(s, vq))) { 831 ret = virtio_scsi_handle_cmd_req_prepare(s, req); 832 if (!ret) { 833 QTAILQ_INSERT_TAIL(&reqs, req, next); 834 } else if (ret == -EINVAL) { 835 /* The device is broken and shouldn't process any request */ 836 while (!QTAILQ_EMPTY(&reqs)) { 837 req = QTAILQ_FIRST(&reqs); 838 QTAILQ_REMOVE(&reqs, req, next); 839 blk_io_unplug(); 840 scsi_req_unref(req->sreq); 841 virtqueue_detach_element(req->vq, &req->elem, 0); 842 virtio_scsi_free_req(req); 843 } 844 } 845 } 846 847 if (suppress_notifications) { 848 virtio_queue_set_notification(vq, 1); 849 } 850 } while (ret != -EINVAL && !virtio_queue_empty(vq)); 851 852 QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { 853 virtio_scsi_handle_cmd_req_submit(s, req); 854 } 855 } 856 857 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) 858 { 859 /* use non-QOM casts in the data path */ 860 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 861 862 if (virtio_scsi_defer_to_dataplane(s)) { 863 return; 864 } 865 866 virtio_scsi_acquire(s); 867 virtio_scsi_handle_cmd_vq(s, vq); 868 virtio_scsi_release(s); 869 } 870 871 static void virtio_scsi_get_config(VirtIODevice *vdev, 872 uint8_t *config) 873 { 874 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 875 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); 876 877 virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); 878 virtio_stl_p(vdev, &scsiconf->seg_max, 879 s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2); 880 virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); 881 virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); 882 virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); 883 virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); 884 virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); 885 virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); 886 virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); 887 virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); 888 } 889 890 static void virtio_scsi_set_config(VirtIODevice *vdev, 891 const uint8_t *config) 892 { 893 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 894 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 895 896 if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || 897 (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { 898 virtio_error(vdev, 899 "bad data written to virtio-scsi configuration space"); 900 return; 901 } 902 903 vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); 904 vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); 905 } 906 907 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, 908 uint64_t requested_features, 909 Error **errp) 910 { 911 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 912 913 /* Firstly sync all virtio-scsi possible supported features */ 914 requested_features |= s->host_features; 915 return requested_features; 916 } 917 918 static void virtio_scsi_reset(VirtIODevice *vdev) 919 { 920 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 921 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 922 923 assert(!s->dataplane_started); 924 925 virtio_scsi_reset_tmf_bh(s); 926 927 qatomic_inc(&s->resetting); 928 bus_cold_reset(BUS(&s->bus)); 929 qatomic_dec(&s->resetting); 930 931 vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 932 vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 933 s->events_dropped = false; 934 } 935 936 typedef struct { 937 uint32_t event; 938 uint32_t reason; 939 union { 940 /* Used by messages specific to a device */ 941 struct { 942 uint32_t id; 943 uint32_t lun; 944 } address; 945 }; 946 } VirtIOSCSIEventInfo; 947 948 static void virtio_scsi_push_event(VirtIOSCSI *s, 949 const VirtIOSCSIEventInfo *info) 950 { 951 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 952 VirtIOSCSIReq *req; 953 VirtIOSCSIEvent *evt; 954 VirtIODevice *vdev = VIRTIO_DEVICE(s); 955 uint32_t event = info->event; 956 uint32_t reason = info->reason; 957 958 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 959 return; 960 } 961 962 req = virtio_scsi_pop_req(s, vs->event_vq); 963 if (!req) { 964 s->events_dropped = true; 965 return; 966 } 967 968 if (s->events_dropped) { 969 event |= VIRTIO_SCSI_T_EVENTS_MISSED; 970 s->events_dropped = false; 971 } 972 973 if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { 974 virtio_scsi_bad_req(req); 975 return; 976 } 977 978 evt = &req->resp.event; 979 memset(evt, 0, sizeof(VirtIOSCSIEvent)); 980 evt->event = virtio_tswap32(vdev, event); 981 evt->reason = virtio_tswap32(vdev, reason); 982 if (event != VIRTIO_SCSI_T_EVENTS_MISSED) { 983 evt->lun[0] = 1; 984 evt->lun[1] = info->address.id; 985 986 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ 987 if (info->address.lun >= 256) { 988 evt->lun[2] = (info->address.lun >> 8) | 0x40; 989 } 990 evt->lun[3] = info->address.lun & 0xFF; 991 } 992 trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason); 993 994 virtio_scsi_complete_req(req); 995 } 996 997 static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) 998 { 999 if (s->events_dropped) { 1000 VirtIOSCSIEventInfo info = { 1001 .event = VIRTIO_SCSI_T_NO_EVENT, 1002 }; 1003 virtio_scsi_push_event(s, &info); 1004 } 1005 } 1006 1007 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) 1008 { 1009 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1010 1011 if (virtio_scsi_defer_to_dataplane(s)) { 1012 return; 1013 } 1014 1015 virtio_scsi_acquire(s); 1016 virtio_scsi_handle_event_vq(s, vq); 1017 virtio_scsi_release(s); 1018 } 1019 1020 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) 1021 { 1022 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1023 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1024 1025 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && 1026 dev->type != TYPE_ROM) { 1027 VirtIOSCSIEventInfo info = { 1028 .event = VIRTIO_SCSI_T_PARAM_CHANGE, 1029 .reason = sense.asc | (sense.ascq << 8), 1030 .address = { 1031 .id = dev->id, 1032 .lun = dev->lun, 1033 }, 1034 }; 1035 1036 virtio_scsi_acquire(s); 1037 virtio_scsi_push_event(s, &info); 1038 virtio_scsi_release(s); 1039 } 1040 } 1041 1042 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, 1043 DeviceState *dev, Error **errp) 1044 { 1045 SCSIDevice *sd = SCSI_DEVICE(dev); 1046 sd->hba_supports_iothread = true; 1047 } 1048 1049 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1050 Error **errp) 1051 { 1052 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1053 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1054 SCSIDevice *sd = SCSI_DEVICE(dev); 1055 AioContext *old_context; 1056 int ret; 1057 1058 if (s->ctx && !s->dataplane_fenced) { 1059 if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { 1060 return; 1061 } 1062 old_context = blk_get_aio_context(sd->conf.blk); 1063 aio_context_acquire(old_context); 1064 ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); 1065 aio_context_release(old_context); 1066 if (ret < 0) { 1067 return; 1068 } 1069 } 1070 1071 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1072 VirtIOSCSIEventInfo info = { 1073 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1074 .reason = VIRTIO_SCSI_EVT_RESET_RESCAN, 1075 .address = { 1076 .id = sd->id, 1077 .lun = sd->lun, 1078 }, 1079 }; 1080 1081 virtio_scsi_acquire(s); 1082 virtio_scsi_push_event(s, &info); 1083 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 1084 virtio_scsi_release(s); 1085 } 1086 } 1087 1088 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1089 Error **errp) 1090 { 1091 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1092 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1093 SCSIDevice *sd = SCSI_DEVICE(dev); 1094 VirtIOSCSIEventInfo info = { 1095 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1096 .reason = VIRTIO_SCSI_EVT_RESET_REMOVED, 1097 .address = { 1098 .id = sd->id, 1099 .lun = sd->lun, 1100 }, 1101 }; 1102 1103 qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); 1104 1105 if (s->ctx) { 1106 virtio_scsi_acquire(s); 1107 /* If other users keep the BlockBackend in the iothread, that's ok */ 1108 blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); 1109 virtio_scsi_release(s); 1110 } 1111 1112 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1113 virtio_scsi_acquire(s); 1114 virtio_scsi_push_event(s, &info); 1115 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 1116 virtio_scsi_release(s); 1117 } 1118 } 1119 1120 /* Suspend virtqueue ioeventfd processing during drain */ 1121 static void virtio_scsi_drained_begin(SCSIBus *bus) 1122 { 1123 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1124 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1125 uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + 1126 s->parent_obj.conf.num_queues; 1127 1128 /* 1129 * Drain is called when stopping dataplane but the host notifier has 1130 * already been detached. Detaching multiple times is a no-op if nothing 1131 * else is using the monitoring same file descriptor, but avoid it just in 1132 * case. 1133 * 1134 * Also, don't detach if dataplane has not even been started yet because 1135 * the host notifier isn't attached. 1136 */ 1137 if (s->dataplane_stopping || !s->dataplane_started) { 1138 return; 1139 } 1140 1141 for (uint32_t i = 0; i < total_queues; i++) { 1142 VirtQueue *vq = virtio_get_queue(vdev, i); 1143 virtio_queue_aio_detach_host_notifier(vq, s->ctx); 1144 } 1145 } 1146 1147 /* Resume virtqueue ioeventfd processing after drain */ 1148 static void virtio_scsi_drained_end(SCSIBus *bus) 1149 { 1150 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1151 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1152 uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + 1153 s->parent_obj.conf.num_queues; 1154 1155 /* 1156 * Drain is called when stopping dataplane. Keep the host notifier detached 1157 * so it's not left dangling after dataplane is stopped. 1158 * 1159 * Also, don't attach if dataplane has not even been started yet. We're not 1160 * ready. 1161 */ 1162 if (s->dataplane_stopping || !s->dataplane_started) { 1163 return; 1164 } 1165 1166 for (uint32_t i = 0; i < total_queues; i++) { 1167 VirtQueue *vq = virtio_get_queue(vdev, i); 1168 virtio_queue_aio_attach_host_notifier(vq, s->ctx); 1169 } 1170 } 1171 1172 static struct SCSIBusInfo virtio_scsi_scsi_info = { 1173 .tcq = true, 1174 .max_channel = VIRTIO_SCSI_MAX_CHANNEL, 1175 .max_target = VIRTIO_SCSI_MAX_TARGET, 1176 .max_lun = VIRTIO_SCSI_MAX_LUN, 1177 1178 .complete = virtio_scsi_command_complete, 1179 .fail = virtio_scsi_command_failed, 1180 .cancel = virtio_scsi_request_cancelled, 1181 .change = virtio_scsi_change, 1182 .parse_cdb = virtio_scsi_parse_cdb, 1183 .get_sg_list = virtio_scsi_get_sg_list, 1184 .save_request = virtio_scsi_save_request, 1185 .load_request = virtio_scsi_load_request, 1186 .drained_begin = virtio_scsi_drained_begin, 1187 .drained_end = virtio_scsi_drained_end, 1188 }; 1189 1190 void virtio_scsi_common_realize(DeviceState *dev, 1191 VirtIOHandleOutput ctrl, 1192 VirtIOHandleOutput evt, 1193 VirtIOHandleOutput cmd, 1194 Error **errp) 1195 { 1196 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1197 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); 1198 int i; 1199 1200 virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig)); 1201 1202 if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) { 1203 s->conf.num_queues = 1; 1204 } 1205 if (s->conf.num_queues == 0 || 1206 s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) { 1207 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1208 "must be a positive integer less than %d.", 1209 s->conf.num_queues, 1210 VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED); 1211 virtio_cleanup(vdev); 1212 return; 1213 } 1214 if (s->conf.virtqueue_size <= 2) { 1215 error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), " 1216 "must be > 2", s->conf.virtqueue_size); 1217 return; 1218 } 1219 s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); 1220 s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 1221 s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 1222 1223 s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); 1224 s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); 1225 for (i = 0; i < s->conf.num_queues; i++) { 1226 s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); 1227 } 1228 } 1229 1230 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) 1231 { 1232 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1233 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1234 Error *err = NULL; 1235 1236 QTAILQ_INIT(&s->tmf_bh_list); 1237 1238 virtio_scsi_common_realize(dev, 1239 virtio_scsi_handle_ctrl, 1240 virtio_scsi_handle_event, 1241 virtio_scsi_handle_cmd, 1242 &err); 1243 if (err != NULL) { 1244 error_propagate(errp, err); 1245 return; 1246 } 1247 1248 scsi_bus_init_named(&s->bus, sizeof(s->bus), dev, 1249 &virtio_scsi_scsi_info, vdev->bus_name); 1250 /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ 1251 qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev)); 1252 1253 virtio_scsi_dataplane_setup(s, errp); 1254 } 1255 1256 void virtio_scsi_common_unrealize(DeviceState *dev) 1257 { 1258 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1259 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 1260 int i; 1261 1262 virtio_delete_queue(vs->ctrl_vq); 1263 virtio_delete_queue(vs->event_vq); 1264 for (i = 0; i < vs->conf.num_queues; i++) { 1265 virtio_delete_queue(vs->cmd_vqs[i]); 1266 } 1267 g_free(vs->cmd_vqs); 1268 virtio_cleanup(vdev); 1269 } 1270 1271 static void virtio_scsi_device_unrealize(DeviceState *dev) 1272 { 1273 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1274 1275 virtio_scsi_reset_tmf_bh(s); 1276 1277 qbus_set_hotplug_handler(BUS(&s->bus), NULL); 1278 virtio_scsi_common_unrealize(dev); 1279 } 1280 1281 static Property virtio_scsi_properties[] = { 1282 DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1283 VIRTIO_SCSI_AUTO_NUM_QUEUES), 1284 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, 1285 parent_obj.conf.virtqueue_size, 256), 1286 DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI, 1287 parent_obj.conf.seg_max_adjust, true), 1288 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, 1289 0xFFFF), 1290 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, 1291 128), 1292 DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, 1293 VIRTIO_SCSI_F_HOTPLUG, true), 1294 DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, 1295 VIRTIO_SCSI_F_CHANGE, true), 1296 DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, 1297 TYPE_IOTHREAD, IOThread *), 1298 DEFINE_PROP_END_OF_LIST(), 1299 }; 1300 1301 static const VMStateDescription vmstate_virtio_scsi = { 1302 .name = "virtio-scsi", 1303 .minimum_version_id = 1, 1304 .version_id = 1, 1305 .fields = (VMStateField[]) { 1306 VMSTATE_VIRTIO_DEVICE, 1307 VMSTATE_END_OF_LIST() 1308 }, 1309 }; 1310 1311 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) 1312 { 1313 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1314 DeviceClass *dc = DEVICE_CLASS(klass); 1315 1316 vdc->get_config = virtio_scsi_get_config; 1317 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1318 } 1319 1320 static void virtio_scsi_class_init(ObjectClass *klass, void *data) 1321 { 1322 DeviceClass *dc = DEVICE_CLASS(klass); 1323 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1324 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 1325 1326 device_class_set_props(dc, virtio_scsi_properties); 1327 dc->vmsd = &vmstate_virtio_scsi; 1328 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1329 vdc->realize = virtio_scsi_device_realize; 1330 vdc->unrealize = virtio_scsi_device_unrealize; 1331 vdc->set_config = virtio_scsi_set_config; 1332 vdc->get_features = virtio_scsi_get_features; 1333 vdc->reset = virtio_scsi_reset; 1334 vdc->start_ioeventfd = virtio_scsi_dataplane_start; 1335 vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; 1336 hc->pre_plug = virtio_scsi_pre_hotplug; 1337 hc->plug = virtio_scsi_hotplug; 1338 hc->unplug = virtio_scsi_hotunplug; 1339 } 1340 1341 static const TypeInfo virtio_scsi_common_info = { 1342 .name = TYPE_VIRTIO_SCSI_COMMON, 1343 .parent = TYPE_VIRTIO_DEVICE, 1344 .instance_size = sizeof(VirtIOSCSICommon), 1345 .abstract = true, 1346 .class_init = virtio_scsi_common_class_init, 1347 }; 1348 1349 static const TypeInfo virtio_scsi_info = { 1350 .name = TYPE_VIRTIO_SCSI, 1351 .parent = TYPE_VIRTIO_SCSI_COMMON, 1352 .instance_size = sizeof(VirtIOSCSI), 1353 .class_init = virtio_scsi_class_init, 1354 .interfaces = (InterfaceInfo[]) { 1355 { TYPE_HOTPLUG_HANDLER }, 1356 { } 1357 } 1358 }; 1359 1360 static void virtio_register_types(void) 1361 { 1362 type_register_static(&virtio_scsi_common_info); 1363 type_register_static(&virtio_scsi_info); 1364 } 1365 1366 type_init(virtio_register_types) 1367