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/defer-call.h" 22 #include "qemu/error-report.h" 23 #include "qemu/iov.h" 24 #include "qemu/module.h" 25 #include "sysemu/block-backend.h" 26 #include "sysemu/dma.h" 27 #include "hw/qdev-properties.h" 28 #include "hw/scsi/scsi.h" 29 #include "scsi/constants.h" 30 #include "hw/virtio/virtio-bus.h" 31 #include "hw/virtio/virtio-access.h" 32 #include "trace.h" 33 34 typedef struct VirtIOSCSIReq { 35 /* 36 * Note: 37 * - fields up to resp_iov are initialized by virtio_scsi_init_req; 38 * - fields starting at vring are zeroed by virtio_scsi_init_req. 39 */ 40 VirtQueueElement elem; 41 42 VirtIOSCSI *dev; 43 VirtQueue *vq; 44 QEMUSGList qsgl; 45 QEMUIOVector resp_iov; 46 47 /* Used for two-stage request submission and TMFs deferred to BH */ 48 QTAILQ_ENTRY(VirtIOSCSIReq) next; 49 50 /* Used for cancellation of request during TMFs */ 51 int remaining; 52 53 SCSIRequest *sreq; 54 size_t resp_size; 55 enum SCSIXferMode mode; 56 union { 57 VirtIOSCSICmdResp cmd; 58 VirtIOSCSICtrlTMFResp tmf; 59 VirtIOSCSICtrlANResp an; 60 VirtIOSCSIEvent event; 61 } resp; 62 union { 63 VirtIOSCSICmdReq cmd; 64 VirtIOSCSICtrlTMFReq tmf; 65 VirtIOSCSICtrlANReq an; 66 } req; 67 } VirtIOSCSIReq; 68 69 static inline int virtio_scsi_get_lun(uint8_t *lun) 70 { 71 return ((lun[2] << 8) | lun[3]) & 0x3FFF; 72 } 73 74 static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun) 75 { 76 if (lun[0] != 1) { 77 return NULL; 78 } 79 if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { 80 return NULL; 81 } 82 return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); 83 } 84 85 static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) 86 { 87 VirtIODevice *vdev = VIRTIO_DEVICE(s); 88 const size_t zero_skip = 89 offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov); 90 91 req->vq = vq; 92 req->dev = s; 93 qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as); 94 qemu_iovec_init(&req->resp_iov, 1); 95 memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip); 96 } 97 98 static void virtio_scsi_free_req(VirtIOSCSIReq *req) 99 { 100 qemu_iovec_destroy(&req->resp_iov); 101 qemu_sglist_destroy(&req->qsgl); 102 g_free(req); 103 } 104 105 static void virtio_scsi_complete_req(VirtIOSCSIReq *req) 106 { 107 VirtIOSCSI *s = req->dev; 108 VirtQueue *vq = req->vq; 109 VirtIODevice *vdev = VIRTIO_DEVICE(s); 110 111 qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); 112 virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); 113 if (s->dataplane_started && !s->dataplane_fenced) { 114 virtio_notify_irqfd(vdev, vq); 115 } else { 116 virtio_notify(vdev, vq); 117 } 118 119 if (req->sreq) { 120 req->sreq->hba_private = NULL; 121 scsi_req_unref(req->sreq); 122 } 123 virtio_scsi_free_req(req); 124 } 125 126 static void virtio_scsi_complete_req_bh(void *opaque) 127 { 128 VirtIOSCSIReq *req = opaque; 129 130 virtio_scsi_complete_req(req); 131 } 132 133 /* 134 * Called from virtio_scsi_do_one_tmf_bh() in main loop thread. The main loop 135 * thread cannot touch the virtqueue since that could race with an IOThread. 136 */ 137 static void virtio_scsi_complete_req_from_main_loop(VirtIOSCSIReq *req) 138 { 139 VirtIOSCSI *s = req->dev; 140 141 if (!s->ctx || s->ctx == qemu_get_aio_context()) { 142 /* No need to schedule a BH when there is no IOThread */ 143 virtio_scsi_complete_req(req); 144 } else { 145 /* Run request completion in the IOThread */ 146 aio_wait_bh_oneshot(s->ctx, virtio_scsi_complete_req_bh, req); 147 } 148 } 149 150 static void virtio_scsi_bad_req(VirtIOSCSIReq *req) 151 { 152 virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers"); 153 virtqueue_detach_element(req->vq, &req->elem, 0); 154 virtio_scsi_free_req(req); 155 } 156 157 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, 158 hwaddr *addr, int num, size_t skip) 159 { 160 QEMUSGList *qsgl = &req->qsgl; 161 size_t copied = 0; 162 163 while (num) { 164 if (skip >= iov->iov_len) { 165 skip -= iov->iov_len; 166 } else { 167 qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); 168 copied += iov->iov_len - skip; 169 skip = 0; 170 } 171 iov++; 172 addr++; 173 num--; 174 } 175 176 assert(skip == 0); 177 return copied; 178 } 179 180 static int virtio_scsi_parse_req(VirtIOSCSIReq *req, 181 unsigned req_size, unsigned resp_size) 182 { 183 VirtIODevice *vdev = (VirtIODevice *) req->dev; 184 size_t in_size, out_size; 185 186 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 187 &req->req, req_size) < req_size) { 188 return -EINVAL; 189 } 190 191 if (qemu_iovec_concat_iov(&req->resp_iov, 192 req->elem.in_sg, req->elem.in_num, 0, 193 resp_size) < resp_size) { 194 return -EINVAL; 195 } 196 197 req->resp_size = resp_size; 198 199 /* Old BIOSes left some padding by mistake after the req_size/resp_size. 200 * As a workaround, always consider the first buffer as the virtio-scsi 201 * request/response, making the payload start at the second element 202 * of the iovec. 203 * 204 * The actual length of the response header, stored in req->resp_size, 205 * does not change. 206 * 207 * TODO: always disable this workaround for virtio 1.0 devices. 208 */ 209 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) { 210 if (req->elem.out_num) { 211 req_size = req->elem.out_sg[0].iov_len; 212 } 213 if (req->elem.in_num) { 214 resp_size = req->elem.in_sg[0].iov_len; 215 } 216 } 217 218 out_size = qemu_sgl_concat(req, req->elem.out_sg, 219 &req->elem.out_addr[0], req->elem.out_num, 220 req_size); 221 in_size = qemu_sgl_concat(req, req->elem.in_sg, 222 &req->elem.in_addr[0], req->elem.in_num, 223 resp_size); 224 225 if (out_size && in_size) { 226 return -ENOTSUP; 227 } 228 229 if (out_size) { 230 req->mode = SCSI_XFER_TO_DEV; 231 } else if (in_size) { 232 req->mode = SCSI_XFER_FROM_DEV; 233 } 234 235 return 0; 236 } 237 238 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) 239 { 240 VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s; 241 VirtIOSCSIReq *req; 242 243 req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size); 244 if (!req) { 245 return NULL; 246 } 247 virtio_scsi_init_req(s, vq, req); 248 return req; 249 } 250 251 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) 252 { 253 VirtIOSCSIReq *req = sreq->hba_private; 254 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); 255 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 256 uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED; 257 258 assert(n < vs->conf.num_queues); 259 qemu_put_be32s(f, &n); 260 qemu_put_virtqueue_element(vdev, f, &req->elem); 261 } 262 263 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) 264 { 265 SCSIBus *bus = sreq->bus; 266 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 267 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 268 VirtIODevice *vdev = VIRTIO_DEVICE(s); 269 VirtIOSCSIReq *req; 270 uint32_t n; 271 272 qemu_get_be32s(f, &n); 273 assert(n < vs->conf.num_queues); 274 req = qemu_get_virtqueue_element(vdev, f, 275 sizeof(VirtIOSCSIReq) + vs->cdb_size); 276 virtio_scsi_init_req(s, vs->cmd_vqs[n], req); 277 278 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 279 sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { 280 error_report("invalid SCSI request migration data"); 281 exit(1); 282 } 283 284 scsi_req_ref(sreq); 285 req->sreq = sreq; 286 if (req->sreq->cmd.mode != SCSI_XFER_NONE) { 287 assert(req->sreq->cmd.mode == req->mode); 288 } 289 return req; 290 } 291 292 typedef struct { 293 Notifier notifier; 294 VirtIOSCSIReq *tmf_req; 295 } VirtIOSCSICancelNotifier; 296 297 static void virtio_scsi_cancel_notify(Notifier *notifier, void *data) 298 { 299 VirtIOSCSICancelNotifier *n = container_of(notifier, 300 VirtIOSCSICancelNotifier, 301 notifier); 302 303 if (--n->tmf_req->remaining == 0) { 304 VirtIOSCSIReq *req = n->tmf_req; 305 306 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), 307 req->req.tmf.tag, req->resp.tmf.response); 308 virtio_scsi_complete_req(req); 309 } 310 g_free(n); 311 } 312 313 static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d) 314 { 315 if (s->dataplane_started && d && blk_is_available(d->conf.blk)) { 316 assert(blk_get_aio_context(d->conf.blk) == s->ctx); 317 } 318 } 319 320 static void virtio_scsi_do_one_tmf_bh(VirtIOSCSIReq *req) 321 { 322 VirtIOSCSI *s = req->dev; 323 SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); 324 BusChild *kid; 325 int target; 326 327 switch (req->req.tmf.subtype) { 328 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 329 if (!d) { 330 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 331 goto out; 332 } 333 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 334 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 335 goto out; 336 } 337 qatomic_inc(&s->resetting); 338 device_cold_reset(&d->qdev); 339 qatomic_dec(&s->resetting); 340 break; 341 342 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 343 target = req->req.tmf.lun[1]; 344 qatomic_inc(&s->resetting); 345 346 rcu_read_lock(); 347 QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) { 348 SCSIDevice *d1 = SCSI_DEVICE(kid->child); 349 if (d1->channel == 0 && d1->id == target) { 350 device_cold_reset(&d1->qdev); 351 } 352 } 353 rcu_read_unlock(); 354 355 qatomic_dec(&s->resetting); 356 break; 357 358 default: 359 g_assert_not_reached(); 360 break; 361 } 362 363 out: 364 object_unref(OBJECT(d)); 365 virtio_scsi_complete_req_from_main_loop(req); 366 } 367 368 /* Some TMFs must be processed from the main loop thread */ 369 static void virtio_scsi_do_tmf_bh(void *opaque) 370 { 371 VirtIOSCSI *s = opaque; 372 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 373 VirtIOSCSIReq *req; 374 VirtIOSCSIReq *tmp; 375 376 GLOBAL_STATE_CODE(); 377 378 WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) { 379 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 380 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 381 QTAILQ_INSERT_TAIL(&reqs, req, next); 382 } 383 384 qemu_bh_delete(s->tmf_bh); 385 s->tmf_bh = NULL; 386 } 387 388 QTAILQ_FOREACH_SAFE(req, &reqs, next, tmp) { 389 QTAILQ_REMOVE(&reqs, req, next); 390 virtio_scsi_do_one_tmf_bh(req); 391 } 392 } 393 394 static void virtio_scsi_reset_tmf_bh(VirtIOSCSI *s) 395 { 396 VirtIOSCSIReq *req; 397 VirtIOSCSIReq *tmp; 398 399 GLOBAL_STATE_CODE(); 400 401 /* Called after ioeventfd has been stopped, so tmf_bh_lock is not needed */ 402 if (s->tmf_bh) { 403 qemu_bh_delete(s->tmf_bh); 404 s->tmf_bh = NULL; 405 } 406 407 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 408 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 409 410 /* SAM-6 6.3.2 Hard reset */ 411 req->resp.tmf.response = VIRTIO_SCSI_S_TARGET_FAILURE; 412 virtio_scsi_complete_req(req); 413 } 414 } 415 416 static void virtio_scsi_defer_tmf_to_bh(VirtIOSCSIReq *req) 417 { 418 VirtIOSCSI *s = req->dev; 419 420 WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) { 421 QTAILQ_INSERT_TAIL(&s->tmf_bh_list, req, next); 422 423 if (!s->tmf_bh) { 424 s->tmf_bh = qemu_bh_new(virtio_scsi_do_tmf_bh, s); 425 qemu_bh_schedule(s->tmf_bh); 426 } 427 } 428 } 429 430 /* Return 0 if the request is ready to be completed and return to guest; 431 * -EINPROGRESS if the request is submitted and will be completed later, in the 432 * case of async cancellation. */ 433 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) 434 { 435 SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); 436 SCSIRequest *r, *next; 437 int ret = 0; 438 439 virtio_scsi_ctx_check(s, d); 440 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ 441 req->resp.tmf.response = VIRTIO_SCSI_S_OK; 442 443 /* 444 * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() 445 * to avoid compiler errors. 446 */ 447 req->req.tmf.subtype = 448 virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); 449 450 trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun), 451 req->req.tmf.tag, req->req.tmf.subtype); 452 453 switch (req->req.tmf.subtype) { 454 case VIRTIO_SCSI_T_TMF_ABORT_TASK: 455 case VIRTIO_SCSI_T_TMF_QUERY_TASK: 456 if (!d) { 457 goto fail; 458 } 459 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 460 goto incorrect_lun; 461 } 462 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 463 VirtIOSCSIReq *cmd_req = r->hba_private; 464 if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { 465 break; 466 } 467 } 468 if (r) { 469 /* 470 * Assert that the request has not been completed yet, we 471 * check for it in the loop above. 472 */ 473 assert(r->hba_private); 474 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { 475 /* "If the specified command is present in the task set, then 476 * return a service response set to FUNCTION SUCCEEDED". 477 */ 478 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 479 } else { 480 VirtIOSCSICancelNotifier *notifier; 481 482 req->remaining = 1; 483 notifier = g_new(VirtIOSCSICancelNotifier, 1); 484 notifier->tmf_req = req; 485 notifier->notifier.notify = virtio_scsi_cancel_notify; 486 scsi_req_cancel_async(r, ¬ifier->notifier); 487 ret = -EINPROGRESS; 488 } 489 } 490 break; 491 492 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 493 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 494 virtio_scsi_defer_tmf_to_bh(req); 495 ret = -EINPROGRESS; 496 break; 497 498 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: 499 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: 500 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: 501 if (!d) { 502 goto fail; 503 } 504 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 505 goto incorrect_lun; 506 } 507 508 /* Add 1 to "remaining" until virtio_scsi_do_tmf returns. 509 * This way, if the bus starts calling back to the notifiers 510 * even before we finish the loop, virtio_scsi_cancel_notify 511 * will not complete the TMF too early. 512 */ 513 req->remaining = 1; 514 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 515 if (r->hba_private) { 516 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { 517 /* "If there is any command present in the task set, then 518 * return a service response set to FUNCTION SUCCEEDED". 519 */ 520 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 521 break; 522 } else { 523 VirtIOSCSICancelNotifier *notifier; 524 525 req->remaining++; 526 notifier = g_new(VirtIOSCSICancelNotifier, 1); 527 notifier->notifier.notify = virtio_scsi_cancel_notify; 528 notifier->tmf_req = req; 529 scsi_req_cancel_async(r, ¬ifier->notifier); 530 } 531 } 532 } 533 if (--req->remaining > 0) { 534 ret = -EINPROGRESS; 535 } 536 break; 537 538 case VIRTIO_SCSI_T_TMF_CLEAR_ACA: 539 default: 540 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; 541 break; 542 } 543 544 object_unref(OBJECT(d)); 545 return ret; 546 547 incorrect_lun: 548 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 549 object_unref(OBJECT(d)); 550 return ret; 551 552 fail: 553 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 554 object_unref(OBJECT(d)); 555 return ret; 556 } 557 558 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) 559 { 560 VirtIODevice *vdev = (VirtIODevice *)s; 561 uint32_t type; 562 int r = 0; 563 564 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 565 &type, sizeof(type)) < sizeof(type)) { 566 virtio_scsi_bad_req(req); 567 return; 568 } 569 570 virtio_tswap32s(vdev, &type); 571 if (type == VIRTIO_SCSI_T_TMF) { 572 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), 573 sizeof(VirtIOSCSICtrlTMFResp)) < 0) { 574 virtio_scsi_bad_req(req); 575 return; 576 } else { 577 r = virtio_scsi_do_tmf(s, req); 578 } 579 580 } else if (type == VIRTIO_SCSI_T_AN_QUERY || 581 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { 582 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), 583 sizeof(VirtIOSCSICtrlANResp)) < 0) { 584 virtio_scsi_bad_req(req); 585 return; 586 } else { 587 req->req.an.event_requested = 588 virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested); 589 trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun), 590 req->req.an.event_requested); 591 req->resp.an.event_actual = 0; 592 req->resp.an.response = VIRTIO_SCSI_S_OK; 593 } 594 } 595 if (r == 0) { 596 if (type == VIRTIO_SCSI_T_TMF) 597 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), 598 req->req.tmf.tag, 599 req->resp.tmf.response); 600 else if (type == VIRTIO_SCSI_T_AN_QUERY || 601 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) 602 trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun), 603 req->resp.an.response); 604 virtio_scsi_complete_req(req); 605 } else { 606 assert(r == -EINPROGRESS); 607 } 608 } 609 610 static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) 611 { 612 VirtIOSCSIReq *req; 613 614 while ((req = virtio_scsi_pop_req(s, vq))) { 615 virtio_scsi_handle_ctrl_req(s, req); 616 } 617 } 618 619 /* 620 * If dataplane is configured but not yet started, do so now and return true on 621 * success. 622 * 623 * Dataplane is started by the core virtio code but virtqueue handler functions 624 * can also be invoked when a guest kicks before DRIVER_OK, so this helper 625 * function helps us deal with manually starting ioeventfd in that case. 626 */ 627 static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s) 628 { 629 if (!s->ctx || s->dataplane_started) { 630 return false; 631 } 632 633 virtio_device_start_ioeventfd(&s->parent_obj.parent_obj); 634 return !s->dataplane_fenced; 635 } 636 637 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 638 { 639 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 640 641 if (virtio_scsi_defer_to_dataplane(s)) { 642 return; 643 } 644 645 virtio_scsi_handle_ctrl_vq(s, vq); 646 } 647 648 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) 649 { 650 trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun), 651 req->req.cmd.tag, 652 req->resp.cmd.response, 653 req->resp.cmd.status); 654 /* Sense data is not in req->resp and is copied separately 655 * in virtio_scsi_command_complete. 656 */ 657 req->resp_size = sizeof(VirtIOSCSICmdResp); 658 virtio_scsi_complete_req(req); 659 } 660 661 static void virtio_scsi_command_failed(SCSIRequest *r) 662 { 663 VirtIOSCSIReq *req = r->hba_private; 664 665 if (r->io_canceled) { 666 return; 667 } 668 669 req->resp.cmd.status = GOOD; 670 switch (r->host_status) { 671 case SCSI_HOST_NO_LUN: 672 req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN; 673 break; 674 case SCSI_HOST_BUSY: 675 req->resp.cmd.response = VIRTIO_SCSI_S_BUSY; 676 break; 677 case SCSI_HOST_TIME_OUT: 678 case SCSI_HOST_ABORTED: 679 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 680 break; 681 case SCSI_HOST_BAD_RESPONSE: 682 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 683 break; 684 case SCSI_HOST_RESET: 685 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 686 break; 687 case SCSI_HOST_TRANSPORT_DISRUPTED: 688 req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE; 689 break; 690 case SCSI_HOST_TARGET_FAILURE: 691 req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE; 692 break; 693 case SCSI_HOST_RESERVATION_ERROR: 694 req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE; 695 break; 696 case SCSI_HOST_ALLOCATION_FAILURE: 697 case SCSI_HOST_MEDIUM_ERROR: 698 case SCSI_HOST_ERROR: 699 default: 700 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 701 break; 702 } 703 virtio_scsi_complete_cmd_req(req); 704 } 705 706 static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid) 707 { 708 VirtIOSCSIReq *req = r->hba_private; 709 uint8_t sense[SCSI_SENSE_BUF_SIZE]; 710 uint32_t sense_len; 711 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 712 713 if (r->io_canceled) { 714 return; 715 } 716 717 req->resp.cmd.response = VIRTIO_SCSI_S_OK; 718 req->resp.cmd.status = r->status; 719 if (req->resp.cmd.status == GOOD) { 720 req->resp.cmd.resid = virtio_tswap32(vdev, resid); 721 } else { 722 req->resp.cmd.resid = 0; 723 sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); 724 sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); 725 qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), 726 sense, sense_len); 727 req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); 728 } 729 virtio_scsi_complete_cmd_req(req); 730 } 731 732 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, 733 uint8_t *buf, size_t buf_len, 734 void *hba_private) 735 { 736 VirtIOSCSIReq *req = hba_private; 737 738 if (cmd->len == 0) { 739 cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); 740 memcpy(cmd->buf, buf, cmd->len); 741 } 742 743 /* Extract the direction and mode directly from the request, for 744 * host device passthrough. 745 */ 746 cmd->xfer = req->qsgl.size; 747 cmd->mode = req->mode; 748 return 0; 749 } 750 751 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) 752 { 753 VirtIOSCSIReq *req = r->hba_private; 754 755 return &req->qsgl; 756 } 757 758 static void virtio_scsi_request_cancelled(SCSIRequest *r) 759 { 760 VirtIOSCSIReq *req = r->hba_private; 761 762 if (!req) { 763 return; 764 } 765 if (qatomic_read(&req->dev->resetting)) { 766 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 767 } else { 768 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 769 } 770 virtio_scsi_complete_cmd_req(req); 771 } 772 773 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) 774 { 775 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 776 virtio_scsi_complete_cmd_req(req); 777 } 778 779 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) 780 { 781 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 782 SCSIDevice *d; 783 int rc; 784 785 rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 786 sizeof(VirtIOSCSICmdResp) + vs->sense_size); 787 if (rc < 0) { 788 if (rc == -ENOTSUP) { 789 virtio_scsi_fail_cmd_req(req); 790 return -ENOTSUP; 791 } else { 792 virtio_scsi_bad_req(req); 793 return -EINVAL; 794 } 795 } 796 trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun), 797 req->req.cmd.tag, req->req.cmd.cdb[0]); 798 799 d = virtio_scsi_device_get(s, req->req.cmd.lun); 800 if (!d) { 801 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 802 virtio_scsi_complete_cmd_req(req); 803 return -ENOENT; 804 } 805 virtio_scsi_ctx_check(s, d); 806 req->sreq = scsi_req_new(d, req->req.cmd.tag, 807 virtio_scsi_get_lun(req->req.cmd.lun), 808 req->req.cmd.cdb, vs->cdb_size, req); 809 810 if (req->sreq->cmd.mode != SCSI_XFER_NONE 811 && (req->sreq->cmd.mode != req->mode || 812 req->sreq->cmd.xfer > req->qsgl.size)) { 813 req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; 814 virtio_scsi_complete_cmd_req(req); 815 object_unref(OBJECT(d)); 816 return -ENOBUFS; 817 } 818 scsi_req_ref(req->sreq); 819 defer_call_begin(); 820 object_unref(OBJECT(d)); 821 return 0; 822 } 823 824 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) 825 { 826 SCSIRequest *sreq = req->sreq; 827 if (scsi_req_enqueue(sreq)) { 828 scsi_req_continue(sreq); 829 } 830 defer_call_end(); 831 scsi_req_unref(sreq); 832 } 833 834 static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) 835 { 836 VirtIOSCSIReq *req, *next; 837 int ret = 0; 838 bool suppress_notifications = virtio_queue_get_notification(vq); 839 840 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 841 842 do { 843 if (suppress_notifications) { 844 virtio_queue_set_notification(vq, 0); 845 } 846 847 while ((req = virtio_scsi_pop_req(s, vq))) { 848 ret = virtio_scsi_handle_cmd_req_prepare(s, req); 849 if (!ret) { 850 QTAILQ_INSERT_TAIL(&reqs, req, next); 851 } else if (ret == -EINVAL) { 852 /* The device is broken and shouldn't process any request */ 853 while (!QTAILQ_EMPTY(&reqs)) { 854 req = QTAILQ_FIRST(&reqs); 855 QTAILQ_REMOVE(&reqs, req, next); 856 defer_call_end(); 857 scsi_req_unref(req->sreq); 858 virtqueue_detach_element(req->vq, &req->elem, 0); 859 virtio_scsi_free_req(req); 860 } 861 } 862 } 863 864 if (suppress_notifications) { 865 virtio_queue_set_notification(vq, 1); 866 } 867 } while (ret != -EINVAL && !virtio_queue_empty(vq)); 868 869 QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { 870 virtio_scsi_handle_cmd_req_submit(s, req); 871 } 872 } 873 874 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) 875 { 876 /* use non-QOM casts in the data path */ 877 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 878 879 if (virtio_scsi_defer_to_dataplane(s)) { 880 return; 881 } 882 883 virtio_scsi_handle_cmd_vq(s, vq); 884 } 885 886 static void virtio_scsi_get_config(VirtIODevice *vdev, 887 uint8_t *config) 888 { 889 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 890 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); 891 892 virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); 893 virtio_stl_p(vdev, &scsiconf->seg_max, 894 s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2); 895 virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); 896 virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); 897 virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); 898 virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); 899 virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); 900 virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); 901 virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); 902 virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); 903 } 904 905 static void virtio_scsi_set_config(VirtIODevice *vdev, 906 const uint8_t *config) 907 { 908 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 909 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 910 911 if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || 912 (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { 913 virtio_error(vdev, 914 "bad data written to virtio-scsi configuration space"); 915 return; 916 } 917 918 vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); 919 vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); 920 } 921 922 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, 923 uint64_t requested_features, 924 Error **errp) 925 { 926 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 927 928 /* Firstly sync all virtio-scsi possible supported features */ 929 requested_features |= s->host_features; 930 return requested_features; 931 } 932 933 static void virtio_scsi_reset(VirtIODevice *vdev) 934 { 935 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 936 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 937 938 assert(!s->dataplane_started); 939 940 virtio_scsi_reset_tmf_bh(s); 941 942 qatomic_inc(&s->resetting); 943 bus_cold_reset(BUS(&s->bus)); 944 qatomic_dec(&s->resetting); 945 946 vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 947 vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 948 s->events_dropped = false; 949 } 950 951 typedef struct { 952 uint32_t event; 953 uint32_t reason; 954 union { 955 /* Used by messages specific to a device */ 956 struct { 957 uint32_t id; 958 uint32_t lun; 959 } address; 960 }; 961 } VirtIOSCSIEventInfo; 962 963 static void virtio_scsi_push_event(VirtIOSCSI *s, 964 const VirtIOSCSIEventInfo *info) 965 { 966 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 967 VirtIOSCSIReq *req; 968 VirtIOSCSIEvent *evt; 969 VirtIODevice *vdev = VIRTIO_DEVICE(s); 970 uint32_t event = info->event; 971 uint32_t reason = info->reason; 972 973 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 974 return; 975 } 976 977 req = virtio_scsi_pop_req(s, vs->event_vq); 978 if (!req) { 979 s->events_dropped = true; 980 return; 981 } 982 983 if (s->events_dropped) { 984 event |= VIRTIO_SCSI_T_EVENTS_MISSED; 985 s->events_dropped = false; 986 } 987 988 if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { 989 virtio_scsi_bad_req(req); 990 return; 991 } 992 993 evt = &req->resp.event; 994 memset(evt, 0, sizeof(VirtIOSCSIEvent)); 995 evt->event = virtio_tswap32(vdev, event); 996 evt->reason = virtio_tswap32(vdev, reason); 997 if (event != VIRTIO_SCSI_T_EVENTS_MISSED) { 998 evt->lun[0] = 1; 999 evt->lun[1] = info->address.id; 1000 1001 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ 1002 if (info->address.lun >= 256) { 1003 evt->lun[2] = (info->address.lun >> 8) | 0x40; 1004 } 1005 evt->lun[3] = info->address.lun & 0xFF; 1006 } 1007 trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason); 1008 1009 virtio_scsi_complete_req(req); 1010 } 1011 1012 static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) 1013 { 1014 if (s->events_dropped) { 1015 VirtIOSCSIEventInfo info = { 1016 .event = VIRTIO_SCSI_T_NO_EVENT, 1017 }; 1018 virtio_scsi_push_event(s, &info); 1019 } 1020 } 1021 1022 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) 1023 { 1024 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1025 1026 if (virtio_scsi_defer_to_dataplane(s)) { 1027 return; 1028 } 1029 1030 virtio_scsi_handle_event_vq(s, vq); 1031 } 1032 1033 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) 1034 { 1035 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1036 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1037 1038 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && 1039 dev->type != TYPE_ROM) { 1040 VirtIOSCSIEventInfo info = { 1041 .event = VIRTIO_SCSI_T_PARAM_CHANGE, 1042 .reason = sense.asc | (sense.ascq << 8), 1043 .address = { 1044 .id = dev->id, 1045 .lun = dev->lun, 1046 }, 1047 }; 1048 1049 virtio_scsi_push_event(s, &info); 1050 } 1051 } 1052 1053 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, 1054 DeviceState *dev, Error **errp) 1055 { 1056 SCSIDevice *sd = SCSI_DEVICE(dev); 1057 sd->hba_supports_iothread = true; 1058 } 1059 1060 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1061 Error **errp) 1062 { 1063 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1064 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1065 SCSIDevice *sd = SCSI_DEVICE(dev); 1066 int ret; 1067 1068 if (s->ctx && !s->dataplane_fenced) { 1069 if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { 1070 return; 1071 } 1072 ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); 1073 if (ret < 0) { 1074 return; 1075 } 1076 } 1077 1078 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1079 VirtIOSCSIEventInfo info = { 1080 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1081 .reason = VIRTIO_SCSI_EVT_RESET_RESCAN, 1082 .address = { 1083 .id = sd->id, 1084 .lun = sd->lun, 1085 }, 1086 }; 1087 1088 virtio_scsi_push_event(s, &info); 1089 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 1090 } 1091 } 1092 1093 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1094 Error **errp) 1095 { 1096 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1097 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1098 SCSIDevice *sd = SCSI_DEVICE(dev); 1099 VirtIOSCSIEventInfo info = { 1100 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1101 .reason = VIRTIO_SCSI_EVT_RESET_REMOVED, 1102 .address = { 1103 .id = sd->id, 1104 .lun = sd->lun, 1105 }, 1106 }; 1107 1108 qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); 1109 1110 if (s->ctx) { 1111 /* If other users keep the BlockBackend in the iothread, that's ok */ 1112 blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); 1113 } 1114 1115 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1116 virtio_scsi_push_event(s, &info); 1117 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 1118 } 1119 } 1120 1121 /* Suspend virtqueue ioeventfd processing during drain */ 1122 static void virtio_scsi_drained_begin(SCSIBus *bus) 1123 { 1124 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1125 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1126 uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + 1127 s->parent_obj.conf.num_queues; 1128 1129 /* 1130 * Drain is called when stopping dataplane but the host notifier has 1131 * already been detached. Detaching multiple times is a no-op if nothing 1132 * else is using the monitoring same file descriptor, but avoid it just in 1133 * case. 1134 * 1135 * Also, don't detach if dataplane has not even been started yet because 1136 * the host notifier isn't attached. 1137 */ 1138 if (s->dataplane_stopping || !s->dataplane_started) { 1139 return; 1140 } 1141 1142 for (uint32_t i = 0; i < total_queues; i++) { 1143 VirtQueue *vq = virtio_get_queue(vdev, i); 1144 virtio_queue_aio_detach_host_notifier(vq, s->ctx); 1145 } 1146 } 1147 1148 /* Resume virtqueue ioeventfd processing after drain */ 1149 static void virtio_scsi_drained_end(SCSIBus *bus) 1150 { 1151 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1152 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 1153 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1154 uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + 1155 s->parent_obj.conf.num_queues; 1156 1157 /* 1158 * Drain is called when stopping dataplane. Keep the host notifier detached 1159 * so it's not left dangling after dataplane is stopped. 1160 * 1161 * Also, don't attach if dataplane has not even been started yet. We're not 1162 * ready. 1163 */ 1164 if (s->dataplane_stopping || !s->dataplane_started) { 1165 return; 1166 } 1167 1168 for (uint32_t i = 0; i < total_queues; i++) { 1169 VirtQueue *vq = virtio_get_queue(vdev, i); 1170 if (vq == vs->event_vq) { 1171 virtio_queue_aio_attach_host_notifier_no_poll(vq, s->ctx); 1172 } else { 1173 virtio_queue_aio_attach_host_notifier(vq, s->ctx); 1174 } 1175 } 1176 } 1177 1178 static struct SCSIBusInfo virtio_scsi_scsi_info = { 1179 .tcq = true, 1180 .max_channel = VIRTIO_SCSI_MAX_CHANNEL, 1181 .max_target = VIRTIO_SCSI_MAX_TARGET, 1182 .max_lun = VIRTIO_SCSI_MAX_LUN, 1183 1184 .complete = virtio_scsi_command_complete, 1185 .fail = virtio_scsi_command_failed, 1186 .cancel = virtio_scsi_request_cancelled, 1187 .change = virtio_scsi_change, 1188 .parse_cdb = virtio_scsi_parse_cdb, 1189 .get_sg_list = virtio_scsi_get_sg_list, 1190 .save_request = virtio_scsi_save_request, 1191 .load_request = virtio_scsi_load_request, 1192 .drained_begin = virtio_scsi_drained_begin, 1193 .drained_end = virtio_scsi_drained_end, 1194 }; 1195 1196 void virtio_scsi_common_realize(DeviceState *dev, 1197 VirtIOHandleOutput ctrl, 1198 VirtIOHandleOutput evt, 1199 VirtIOHandleOutput cmd, 1200 Error **errp) 1201 { 1202 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1203 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); 1204 int i; 1205 1206 virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig)); 1207 1208 if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) { 1209 s->conf.num_queues = 1; 1210 } 1211 if (s->conf.num_queues == 0 || 1212 s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) { 1213 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1214 "must be a positive integer less than %d.", 1215 s->conf.num_queues, 1216 VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED); 1217 virtio_cleanup(vdev); 1218 return; 1219 } 1220 if (s->conf.virtqueue_size <= 2) { 1221 error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), " 1222 "must be > 2", s->conf.virtqueue_size); 1223 return; 1224 } 1225 s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); 1226 s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 1227 s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 1228 1229 s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); 1230 s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); 1231 for (i = 0; i < s->conf.num_queues; i++) { 1232 s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); 1233 } 1234 } 1235 1236 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) 1237 { 1238 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1239 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1240 Error *err = NULL; 1241 1242 QTAILQ_INIT(&s->tmf_bh_list); 1243 qemu_mutex_init(&s->tmf_bh_lock); 1244 1245 virtio_scsi_common_realize(dev, 1246 virtio_scsi_handle_ctrl, 1247 virtio_scsi_handle_event, 1248 virtio_scsi_handle_cmd, 1249 &err); 1250 if (err != NULL) { 1251 error_propagate(errp, err); 1252 return; 1253 } 1254 1255 scsi_bus_init_named(&s->bus, sizeof(s->bus), dev, 1256 &virtio_scsi_scsi_info, vdev->bus_name); 1257 /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ 1258 qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev)); 1259 1260 virtio_scsi_dataplane_setup(s, errp); 1261 } 1262 1263 void virtio_scsi_common_unrealize(DeviceState *dev) 1264 { 1265 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1266 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 1267 int i; 1268 1269 virtio_delete_queue(vs->ctrl_vq); 1270 virtio_delete_queue(vs->event_vq); 1271 for (i = 0; i < vs->conf.num_queues; i++) { 1272 virtio_delete_queue(vs->cmd_vqs[i]); 1273 } 1274 g_free(vs->cmd_vqs); 1275 virtio_cleanup(vdev); 1276 } 1277 1278 static void virtio_scsi_device_unrealize(DeviceState *dev) 1279 { 1280 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1281 1282 virtio_scsi_reset_tmf_bh(s); 1283 1284 qbus_set_hotplug_handler(BUS(&s->bus), NULL); 1285 virtio_scsi_common_unrealize(dev); 1286 qemu_mutex_destroy(&s->tmf_bh_lock); 1287 } 1288 1289 static Property virtio_scsi_properties[] = { 1290 DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1291 VIRTIO_SCSI_AUTO_NUM_QUEUES), 1292 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, 1293 parent_obj.conf.virtqueue_size, 256), 1294 DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI, 1295 parent_obj.conf.seg_max_adjust, true), 1296 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, 1297 0xFFFF), 1298 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, 1299 128), 1300 DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, 1301 VIRTIO_SCSI_F_HOTPLUG, true), 1302 DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, 1303 VIRTIO_SCSI_F_CHANGE, true), 1304 DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, 1305 TYPE_IOTHREAD, IOThread *), 1306 DEFINE_PROP_END_OF_LIST(), 1307 }; 1308 1309 static const VMStateDescription vmstate_virtio_scsi = { 1310 .name = "virtio-scsi", 1311 .minimum_version_id = 1, 1312 .version_id = 1, 1313 .fields = (const VMStateField[]) { 1314 VMSTATE_VIRTIO_DEVICE, 1315 VMSTATE_END_OF_LIST() 1316 }, 1317 }; 1318 1319 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) 1320 { 1321 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1322 DeviceClass *dc = DEVICE_CLASS(klass); 1323 1324 vdc->get_config = virtio_scsi_get_config; 1325 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1326 } 1327 1328 static void virtio_scsi_class_init(ObjectClass *klass, void *data) 1329 { 1330 DeviceClass *dc = DEVICE_CLASS(klass); 1331 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1332 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 1333 1334 device_class_set_props(dc, virtio_scsi_properties); 1335 dc->vmsd = &vmstate_virtio_scsi; 1336 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1337 vdc->realize = virtio_scsi_device_realize; 1338 vdc->unrealize = virtio_scsi_device_unrealize; 1339 vdc->set_config = virtio_scsi_set_config; 1340 vdc->get_features = virtio_scsi_get_features; 1341 vdc->reset = virtio_scsi_reset; 1342 vdc->start_ioeventfd = virtio_scsi_dataplane_start; 1343 vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; 1344 hc->pre_plug = virtio_scsi_pre_hotplug; 1345 hc->plug = virtio_scsi_hotplug; 1346 hc->unplug = virtio_scsi_hotunplug; 1347 } 1348 1349 static const TypeInfo virtio_scsi_common_info = { 1350 .name = TYPE_VIRTIO_SCSI_COMMON, 1351 .parent = TYPE_VIRTIO_DEVICE, 1352 .instance_size = sizeof(VirtIOSCSICommon), 1353 .abstract = true, 1354 .class_init = virtio_scsi_common_class_init, 1355 }; 1356 1357 static const TypeInfo virtio_scsi_info = { 1358 .name = TYPE_VIRTIO_SCSI, 1359 .parent = TYPE_VIRTIO_SCSI_COMMON, 1360 .instance_size = sizeof(VirtIOSCSI), 1361 .class_init = virtio_scsi_class_init, 1362 .interfaces = (InterfaceInfo[]) { 1363 { TYPE_HOTPLUG_HANDLER }, 1364 { } 1365 } 1366 }; 1367 1368 static void virtio_register_types(void) 1369 { 1370 type_register_static(&virtio_scsi_common_info); 1371 type_register_static(&virtio_scsi_info); 1372 } 1373 1374 type_init(virtio_register_types) 1375