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 } 361 362 out: 363 object_unref(OBJECT(d)); 364 virtio_scsi_complete_req_from_main_loop(req); 365 } 366 367 /* Some TMFs must be processed from the main loop thread */ 368 static void virtio_scsi_do_tmf_bh(void *opaque) 369 { 370 VirtIOSCSI *s = opaque; 371 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 372 VirtIOSCSIReq *req; 373 VirtIOSCSIReq *tmp; 374 375 GLOBAL_STATE_CODE(); 376 377 WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) { 378 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 379 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 380 QTAILQ_INSERT_TAIL(&reqs, req, next); 381 } 382 383 qemu_bh_delete(s->tmf_bh); 384 s->tmf_bh = NULL; 385 } 386 387 QTAILQ_FOREACH_SAFE(req, &reqs, next, tmp) { 388 QTAILQ_REMOVE(&reqs, req, next); 389 virtio_scsi_do_one_tmf_bh(req); 390 } 391 } 392 393 static void virtio_scsi_reset_tmf_bh(VirtIOSCSI *s) 394 { 395 VirtIOSCSIReq *req; 396 VirtIOSCSIReq *tmp; 397 398 GLOBAL_STATE_CODE(); 399 400 /* Called after ioeventfd has been stopped, so tmf_bh_lock is not needed */ 401 if (s->tmf_bh) { 402 qemu_bh_delete(s->tmf_bh); 403 s->tmf_bh = NULL; 404 } 405 406 QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) { 407 QTAILQ_REMOVE(&s->tmf_bh_list, req, next); 408 409 /* SAM-6 6.3.2 Hard reset */ 410 req->resp.tmf.response = VIRTIO_SCSI_S_TARGET_FAILURE; 411 virtio_scsi_complete_req(req); 412 } 413 } 414 415 static void virtio_scsi_defer_tmf_to_bh(VirtIOSCSIReq *req) 416 { 417 VirtIOSCSI *s = req->dev; 418 419 WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) { 420 QTAILQ_INSERT_TAIL(&s->tmf_bh_list, req, next); 421 422 if (!s->tmf_bh) { 423 s->tmf_bh = qemu_bh_new(virtio_scsi_do_tmf_bh, s); 424 qemu_bh_schedule(s->tmf_bh); 425 } 426 } 427 } 428 429 /* Return 0 if the request is ready to be completed and return to guest; 430 * -EINPROGRESS if the request is submitted and will be completed later, in the 431 * case of async cancellation. */ 432 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) 433 { 434 SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); 435 SCSIRequest *r, *next; 436 int ret = 0; 437 438 virtio_scsi_ctx_check(s, d); 439 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ 440 req->resp.tmf.response = VIRTIO_SCSI_S_OK; 441 442 /* 443 * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() 444 * to avoid compiler errors. 445 */ 446 req->req.tmf.subtype = 447 virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); 448 449 trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun), 450 req->req.tmf.tag, req->req.tmf.subtype); 451 452 switch (req->req.tmf.subtype) { 453 case VIRTIO_SCSI_T_TMF_ABORT_TASK: 454 case VIRTIO_SCSI_T_TMF_QUERY_TASK: 455 if (!d) { 456 goto fail; 457 } 458 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 459 goto incorrect_lun; 460 } 461 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 462 VirtIOSCSIReq *cmd_req = r->hba_private; 463 if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { 464 break; 465 } 466 } 467 if (r) { 468 /* 469 * Assert that the request has not been completed yet, we 470 * check for it in the loop above. 471 */ 472 assert(r->hba_private); 473 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { 474 /* "If the specified command is present in the task set, then 475 * return a service response set to FUNCTION SUCCEEDED". 476 */ 477 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 478 } else { 479 VirtIOSCSICancelNotifier *notifier; 480 481 req->remaining = 1; 482 notifier = g_new(VirtIOSCSICancelNotifier, 1); 483 notifier->tmf_req = req; 484 notifier->notifier.notify = virtio_scsi_cancel_notify; 485 scsi_req_cancel_async(r, ¬ifier->notifier); 486 ret = -EINPROGRESS; 487 } 488 } 489 break; 490 491 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 492 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 493 virtio_scsi_defer_tmf_to_bh(req); 494 ret = -EINPROGRESS; 495 break; 496 497 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: 498 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: 499 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: 500 if (!d) { 501 goto fail; 502 } 503 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 504 goto incorrect_lun; 505 } 506 507 /* Add 1 to "remaining" until virtio_scsi_do_tmf returns. 508 * This way, if the bus starts calling back to the notifiers 509 * even before we finish the loop, virtio_scsi_cancel_notify 510 * will not complete the TMF too early. 511 */ 512 req->remaining = 1; 513 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 514 if (r->hba_private) { 515 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { 516 /* "If there is any command present in the task set, then 517 * return a service response set to FUNCTION SUCCEEDED". 518 */ 519 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 520 break; 521 } else { 522 VirtIOSCSICancelNotifier *notifier; 523 524 req->remaining++; 525 notifier = g_new(VirtIOSCSICancelNotifier, 1); 526 notifier->notifier.notify = virtio_scsi_cancel_notify; 527 notifier->tmf_req = req; 528 scsi_req_cancel_async(r, ¬ifier->notifier); 529 } 530 } 531 } 532 if (--req->remaining > 0) { 533 ret = -EINPROGRESS; 534 } 535 break; 536 537 case VIRTIO_SCSI_T_TMF_CLEAR_ACA: 538 default: 539 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; 540 break; 541 } 542 543 object_unref(OBJECT(d)); 544 return ret; 545 546 incorrect_lun: 547 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 548 object_unref(OBJECT(d)); 549 return ret; 550 551 fail: 552 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 553 object_unref(OBJECT(d)); 554 return ret; 555 } 556 557 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) 558 { 559 VirtIODevice *vdev = (VirtIODevice *)s; 560 uint32_t type; 561 int r = 0; 562 563 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 564 &type, sizeof(type)) < sizeof(type)) { 565 virtio_scsi_bad_req(req); 566 return; 567 } 568 569 virtio_tswap32s(vdev, &type); 570 if (type == VIRTIO_SCSI_T_TMF) { 571 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), 572 sizeof(VirtIOSCSICtrlTMFResp)) < 0) { 573 virtio_scsi_bad_req(req); 574 return; 575 } else { 576 r = virtio_scsi_do_tmf(s, req); 577 } 578 579 } else if (type == VIRTIO_SCSI_T_AN_QUERY || 580 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { 581 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), 582 sizeof(VirtIOSCSICtrlANResp)) < 0) { 583 virtio_scsi_bad_req(req); 584 return; 585 } else { 586 req->req.an.event_requested = 587 virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested); 588 trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun), 589 req->req.an.event_requested); 590 req->resp.an.event_actual = 0; 591 req->resp.an.response = VIRTIO_SCSI_S_OK; 592 } 593 } 594 if (r == 0) { 595 if (type == VIRTIO_SCSI_T_TMF) 596 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), 597 req->req.tmf.tag, 598 req->resp.tmf.response); 599 else if (type == VIRTIO_SCSI_T_AN_QUERY || 600 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) 601 trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun), 602 req->resp.an.response); 603 virtio_scsi_complete_req(req); 604 } else { 605 assert(r == -EINPROGRESS); 606 } 607 } 608 609 static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) 610 { 611 VirtIOSCSIReq *req; 612 613 while ((req = virtio_scsi_pop_req(s, vq))) { 614 virtio_scsi_handle_ctrl_req(s, req); 615 } 616 } 617 618 /* 619 * If dataplane is configured but not yet started, do so now and return true on 620 * success. 621 * 622 * Dataplane is started by the core virtio code but virtqueue handler functions 623 * can also be invoked when a guest kicks before DRIVER_OK, so this helper 624 * function helps us deal with manually starting ioeventfd in that case. 625 */ 626 static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s) 627 { 628 if (!s->ctx || s->dataplane_started) { 629 return false; 630 } 631 632 virtio_device_start_ioeventfd(&s->parent_obj.parent_obj); 633 return !s->dataplane_fenced; 634 } 635 636 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 637 { 638 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 639 640 if (virtio_scsi_defer_to_dataplane(s)) { 641 return; 642 } 643 644 virtio_scsi_handle_ctrl_vq(s, vq); 645 } 646 647 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) 648 { 649 trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun), 650 req->req.cmd.tag, 651 req->resp.cmd.response, 652 req->resp.cmd.status); 653 /* Sense data is not in req->resp and is copied separately 654 * in virtio_scsi_command_complete. 655 */ 656 req->resp_size = sizeof(VirtIOSCSICmdResp); 657 virtio_scsi_complete_req(req); 658 } 659 660 static void virtio_scsi_command_failed(SCSIRequest *r) 661 { 662 VirtIOSCSIReq *req = r->hba_private; 663 664 if (r->io_canceled) { 665 return; 666 } 667 668 req->resp.cmd.status = GOOD; 669 switch (r->host_status) { 670 case SCSI_HOST_NO_LUN: 671 req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN; 672 break; 673 case SCSI_HOST_BUSY: 674 req->resp.cmd.response = VIRTIO_SCSI_S_BUSY; 675 break; 676 case SCSI_HOST_TIME_OUT: 677 case SCSI_HOST_ABORTED: 678 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 679 break; 680 case SCSI_HOST_BAD_RESPONSE: 681 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 682 break; 683 case SCSI_HOST_RESET: 684 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 685 break; 686 case SCSI_HOST_TRANSPORT_DISRUPTED: 687 req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE; 688 break; 689 case SCSI_HOST_TARGET_FAILURE: 690 req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE; 691 break; 692 case SCSI_HOST_RESERVATION_ERROR: 693 req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE; 694 break; 695 case SCSI_HOST_ALLOCATION_FAILURE: 696 case SCSI_HOST_MEDIUM_ERROR: 697 case SCSI_HOST_ERROR: 698 default: 699 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 700 break; 701 } 702 virtio_scsi_complete_cmd_req(req); 703 } 704 705 static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid) 706 { 707 VirtIOSCSIReq *req = r->hba_private; 708 uint8_t sense[SCSI_SENSE_BUF_SIZE]; 709 uint32_t sense_len; 710 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 711 712 if (r->io_canceled) { 713 return; 714 } 715 716 req->resp.cmd.response = VIRTIO_SCSI_S_OK; 717 req->resp.cmd.status = r->status; 718 if (req->resp.cmd.status == GOOD) { 719 req->resp.cmd.resid = virtio_tswap32(vdev, resid); 720 } else { 721 req->resp.cmd.resid = 0; 722 sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); 723 sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); 724 qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), 725 sense, sense_len); 726 req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); 727 } 728 virtio_scsi_complete_cmd_req(req); 729 } 730 731 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, 732 uint8_t *buf, size_t buf_len, 733 void *hba_private) 734 { 735 VirtIOSCSIReq *req = hba_private; 736 737 if (cmd->len == 0) { 738 cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); 739 memcpy(cmd->buf, buf, cmd->len); 740 } 741 742 /* Extract the direction and mode directly from the request, for 743 * host device passthrough. 744 */ 745 cmd->xfer = req->qsgl.size; 746 cmd->mode = req->mode; 747 return 0; 748 } 749 750 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) 751 { 752 VirtIOSCSIReq *req = r->hba_private; 753 754 return &req->qsgl; 755 } 756 757 static void virtio_scsi_request_cancelled(SCSIRequest *r) 758 { 759 VirtIOSCSIReq *req = r->hba_private; 760 761 if (!req) { 762 return; 763 } 764 if (qatomic_read(&req->dev->resetting)) { 765 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 766 } else { 767 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 768 } 769 virtio_scsi_complete_cmd_req(req); 770 } 771 772 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) 773 { 774 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 775 virtio_scsi_complete_cmd_req(req); 776 } 777 778 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) 779 { 780 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 781 SCSIDevice *d; 782 int rc; 783 784 rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 785 sizeof(VirtIOSCSICmdResp) + vs->sense_size); 786 if (rc < 0) { 787 if (rc == -ENOTSUP) { 788 virtio_scsi_fail_cmd_req(req); 789 return -ENOTSUP; 790 } else { 791 virtio_scsi_bad_req(req); 792 return -EINVAL; 793 } 794 } 795 trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun), 796 req->req.cmd.tag, req->req.cmd.cdb[0]); 797 798 d = virtio_scsi_device_get(s, req->req.cmd.lun); 799 if (!d) { 800 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 801 virtio_scsi_complete_cmd_req(req); 802 return -ENOENT; 803 } 804 virtio_scsi_ctx_check(s, d); 805 req->sreq = scsi_req_new(d, req->req.cmd.tag, 806 virtio_scsi_get_lun(req->req.cmd.lun), 807 req->req.cmd.cdb, vs->cdb_size, req); 808 809 if (req->sreq->cmd.mode != SCSI_XFER_NONE 810 && (req->sreq->cmd.mode != req->mode || 811 req->sreq->cmd.xfer > req->qsgl.size)) { 812 req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; 813 virtio_scsi_complete_cmd_req(req); 814 object_unref(OBJECT(d)); 815 return -ENOBUFS; 816 } 817 scsi_req_ref(req->sreq); 818 defer_call_begin(); 819 object_unref(OBJECT(d)); 820 return 0; 821 } 822 823 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) 824 { 825 SCSIRequest *sreq = req->sreq; 826 if (scsi_req_enqueue(sreq)) { 827 scsi_req_continue(sreq); 828 } 829 defer_call_end(); 830 scsi_req_unref(sreq); 831 } 832 833 static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) 834 { 835 VirtIOSCSIReq *req, *next; 836 int ret = 0; 837 bool suppress_notifications = virtio_queue_get_notification(vq); 838 839 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 840 841 do { 842 if (suppress_notifications) { 843 virtio_queue_set_notification(vq, 0); 844 } 845 846 while ((req = virtio_scsi_pop_req(s, vq))) { 847 ret = virtio_scsi_handle_cmd_req_prepare(s, req); 848 if (!ret) { 849 QTAILQ_INSERT_TAIL(&reqs, req, next); 850 } else if (ret == -EINVAL) { 851 /* The device is broken and shouldn't process any request */ 852 while (!QTAILQ_EMPTY(&reqs)) { 853 req = QTAILQ_FIRST(&reqs); 854 QTAILQ_REMOVE(&reqs, req, next); 855 defer_call_end(); 856 scsi_req_unref(req->sreq); 857 virtqueue_detach_element(req->vq, &req->elem, 0); 858 virtio_scsi_free_req(req); 859 } 860 } 861 } 862 863 if (suppress_notifications) { 864 virtio_queue_set_notification(vq, 1); 865 } 866 } while (ret != -EINVAL && !virtio_queue_empty(vq)); 867 868 QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { 869 virtio_scsi_handle_cmd_req_submit(s, req); 870 } 871 } 872 873 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) 874 { 875 /* use non-QOM casts in the data path */ 876 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 877 878 if (virtio_scsi_defer_to_dataplane(s)) { 879 return; 880 } 881 882 virtio_scsi_handle_cmd_vq(s, vq); 883 } 884 885 static void virtio_scsi_get_config(VirtIODevice *vdev, 886 uint8_t *config) 887 { 888 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 889 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); 890 891 virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); 892 virtio_stl_p(vdev, &scsiconf->seg_max, 893 s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2); 894 virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); 895 virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); 896 virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); 897 virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); 898 virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); 899 virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); 900 virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); 901 virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); 902 } 903 904 static void virtio_scsi_set_config(VirtIODevice *vdev, 905 const uint8_t *config) 906 { 907 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 908 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 909 910 if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || 911 (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { 912 virtio_error(vdev, 913 "bad data written to virtio-scsi configuration space"); 914 return; 915 } 916 917 vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); 918 vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); 919 } 920 921 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, 922 uint64_t requested_features, 923 Error **errp) 924 { 925 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 926 927 /* Firstly sync all virtio-scsi possible supported features */ 928 requested_features |= s->host_features; 929 return requested_features; 930 } 931 932 static void virtio_scsi_reset(VirtIODevice *vdev) 933 { 934 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 935 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 936 937 assert(!s->dataplane_started); 938 939 virtio_scsi_reset_tmf_bh(s); 940 941 qatomic_inc(&s->resetting); 942 bus_cold_reset(BUS(&s->bus)); 943 qatomic_dec(&s->resetting); 944 945 vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 946 vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 947 s->events_dropped = false; 948 } 949 950 typedef struct { 951 uint32_t event; 952 uint32_t reason; 953 union { 954 /* Used by messages specific to a device */ 955 struct { 956 uint32_t id; 957 uint32_t lun; 958 } address; 959 }; 960 } VirtIOSCSIEventInfo; 961 962 static void virtio_scsi_push_event(VirtIOSCSI *s, 963 const VirtIOSCSIEventInfo *info) 964 { 965 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 966 VirtIOSCSIReq *req; 967 VirtIOSCSIEvent *evt; 968 VirtIODevice *vdev = VIRTIO_DEVICE(s); 969 uint32_t event = info->event; 970 uint32_t reason = info->reason; 971 972 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 973 return; 974 } 975 976 req = virtio_scsi_pop_req(s, vs->event_vq); 977 if (!req) { 978 s->events_dropped = true; 979 return; 980 } 981 982 if (s->events_dropped) { 983 event |= VIRTIO_SCSI_T_EVENTS_MISSED; 984 s->events_dropped = false; 985 } 986 987 if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { 988 virtio_scsi_bad_req(req); 989 return; 990 } 991 992 evt = &req->resp.event; 993 memset(evt, 0, sizeof(VirtIOSCSIEvent)); 994 evt->event = virtio_tswap32(vdev, event); 995 evt->reason = virtio_tswap32(vdev, reason); 996 if (event != VIRTIO_SCSI_T_EVENTS_MISSED) { 997 evt->lun[0] = 1; 998 evt->lun[1] = info->address.id; 999 1000 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ 1001 if (info->address.lun >= 256) { 1002 evt->lun[2] = (info->address.lun >> 8) | 0x40; 1003 } 1004 evt->lun[3] = info->address.lun & 0xFF; 1005 } 1006 trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason); 1007 1008 virtio_scsi_complete_req(req); 1009 } 1010 1011 static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) 1012 { 1013 if (s->events_dropped) { 1014 VirtIOSCSIEventInfo info = { 1015 .event = VIRTIO_SCSI_T_NO_EVENT, 1016 }; 1017 virtio_scsi_push_event(s, &info); 1018 } 1019 } 1020 1021 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) 1022 { 1023 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1024 1025 if (virtio_scsi_defer_to_dataplane(s)) { 1026 return; 1027 } 1028 1029 virtio_scsi_handle_event_vq(s, vq); 1030 } 1031 1032 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) 1033 { 1034 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 1035 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1036 1037 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && 1038 dev->type != TYPE_ROM) { 1039 VirtIOSCSIEventInfo info = { 1040 .event = VIRTIO_SCSI_T_PARAM_CHANGE, 1041 .reason = sense.asc | (sense.ascq << 8), 1042 .address = { 1043 .id = dev->id, 1044 .lun = dev->lun, 1045 }, 1046 }; 1047 1048 virtio_scsi_push_event(s, &info); 1049 } 1050 } 1051 1052 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, 1053 DeviceState *dev, Error **errp) 1054 { 1055 SCSIDevice *sd = SCSI_DEVICE(dev); 1056 sd->hba_supports_iothread = true; 1057 } 1058 1059 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1060 Error **errp) 1061 { 1062 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1063 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1064 SCSIDevice *sd = SCSI_DEVICE(dev); 1065 int ret; 1066 1067 if (s->ctx && !s->dataplane_fenced) { 1068 if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { 1069 return; 1070 } 1071 ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); 1072 if (ret < 0) { 1073 return; 1074 } 1075 } 1076 1077 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1078 VirtIOSCSIEventInfo info = { 1079 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1080 .reason = VIRTIO_SCSI_EVT_RESET_RESCAN, 1081 .address = { 1082 .id = sd->id, 1083 .lun = sd->lun, 1084 }, 1085 }; 1086 1087 virtio_scsi_push_event(s, &info); 1088 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 1089 } 1090 } 1091 1092 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, 1093 Error **errp) 1094 { 1095 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 1096 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 1097 SCSIDevice *sd = SCSI_DEVICE(dev); 1098 VirtIOSCSIEventInfo info = { 1099 .event = VIRTIO_SCSI_T_TRANSPORT_RESET, 1100 .reason = VIRTIO_SCSI_EVT_RESET_REMOVED, 1101 .address = { 1102 .id = sd->id, 1103 .lun = sd->lun, 1104 }, 1105 }; 1106 1107 qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); 1108 1109 if (s->ctx) { 1110 /* If other users keep the BlockBackend in the iothread, that's ok */ 1111 blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); 1112 } 1113 1114 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 1115 virtio_scsi_push_event(s, &info); 1116 scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); 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 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 1152 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1153 uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + 1154 s->parent_obj.conf.num_queues; 1155 1156 /* 1157 * Drain is called when stopping dataplane. Keep the host notifier detached 1158 * so it's not left dangling after dataplane is stopped. 1159 * 1160 * Also, don't attach if dataplane has not even been started yet. We're not 1161 * ready. 1162 */ 1163 if (s->dataplane_stopping || !s->dataplane_started) { 1164 return; 1165 } 1166 1167 for (uint32_t i = 0; i < total_queues; i++) { 1168 VirtQueue *vq = virtio_get_queue(vdev, i); 1169 if (vq == vs->event_vq) { 1170 virtio_queue_aio_attach_host_notifier_no_poll(vq, s->ctx); 1171 } else { 1172 virtio_queue_aio_attach_host_notifier(vq, s->ctx); 1173 } 1174 } 1175 } 1176 1177 static struct SCSIBusInfo virtio_scsi_scsi_info = { 1178 .tcq = true, 1179 .max_channel = VIRTIO_SCSI_MAX_CHANNEL, 1180 .max_target = VIRTIO_SCSI_MAX_TARGET, 1181 .max_lun = VIRTIO_SCSI_MAX_LUN, 1182 1183 .complete = virtio_scsi_command_complete, 1184 .fail = virtio_scsi_command_failed, 1185 .cancel = virtio_scsi_request_cancelled, 1186 .change = virtio_scsi_change, 1187 .parse_cdb = virtio_scsi_parse_cdb, 1188 .get_sg_list = virtio_scsi_get_sg_list, 1189 .save_request = virtio_scsi_save_request, 1190 .load_request = virtio_scsi_load_request, 1191 .drained_begin = virtio_scsi_drained_begin, 1192 .drained_end = virtio_scsi_drained_end, 1193 }; 1194 1195 void virtio_scsi_common_realize(DeviceState *dev, 1196 VirtIOHandleOutput ctrl, 1197 VirtIOHandleOutput evt, 1198 VirtIOHandleOutput cmd, 1199 Error **errp) 1200 { 1201 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1202 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); 1203 int i; 1204 1205 virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig)); 1206 1207 if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) { 1208 s->conf.num_queues = 1; 1209 } 1210 if (s->conf.num_queues == 0 || 1211 s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) { 1212 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 1213 "must be a positive integer less than %d.", 1214 s->conf.num_queues, 1215 VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED); 1216 virtio_cleanup(vdev); 1217 return; 1218 } 1219 if (s->conf.virtqueue_size <= 2) { 1220 error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), " 1221 "must be > 2", s->conf.virtqueue_size); 1222 return; 1223 } 1224 s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); 1225 s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 1226 s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 1227 1228 s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); 1229 s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); 1230 for (i = 0; i < s->conf.num_queues; i++) { 1231 s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); 1232 } 1233 } 1234 1235 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) 1236 { 1237 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1238 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1239 Error *err = NULL; 1240 1241 QTAILQ_INIT(&s->tmf_bh_list); 1242 qemu_mutex_init(&s->tmf_bh_lock); 1243 1244 virtio_scsi_common_realize(dev, 1245 virtio_scsi_handle_ctrl, 1246 virtio_scsi_handle_event, 1247 virtio_scsi_handle_cmd, 1248 &err); 1249 if (err != NULL) { 1250 error_propagate(errp, err); 1251 return; 1252 } 1253 1254 scsi_bus_init_named(&s->bus, sizeof(s->bus), dev, 1255 &virtio_scsi_scsi_info, vdev->bus_name); 1256 /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ 1257 qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev)); 1258 1259 virtio_scsi_dataplane_setup(s, errp); 1260 } 1261 1262 void virtio_scsi_common_unrealize(DeviceState *dev) 1263 { 1264 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1265 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 1266 int i; 1267 1268 virtio_delete_queue(vs->ctrl_vq); 1269 virtio_delete_queue(vs->event_vq); 1270 for (i = 0; i < vs->conf.num_queues; i++) { 1271 virtio_delete_queue(vs->cmd_vqs[i]); 1272 } 1273 g_free(vs->cmd_vqs); 1274 virtio_cleanup(vdev); 1275 } 1276 1277 static void virtio_scsi_device_unrealize(DeviceState *dev) 1278 { 1279 VirtIOSCSI *s = VIRTIO_SCSI(dev); 1280 1281 virtio_scsi_reset_tmf_bh(s); 1282 1283 qbus_set_hotplug_handler(BUS(&s->bus), NULL); 1284 virtio_scsi_common_unrealize(dev); 1285 qemu_mutex_destroy(&s->tmf_bh_lock); 1286 } 1287 1288 static Property virtio_scsi_properties[] = { 1289 DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1290 VIRTIO_SCSI_AUTO_NUM_QUEUES), 1291 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, 1292 parent_obj.conf.virtqueue_size, 256), 1293 DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI, 1294 parent_obj.conf.seg_max_adjust, true), 1295 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, 1296 0xFFFF), 1297 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, 1298 128), 1299 DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, 1300 VIRTIO_SCSI_F_HOTPLUG, true), 1301 DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, 1302 VIRTIO_SCSI_F_CHANGE, true), 1303 DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, 1304 TYPE_IOTHREAD, IOThread *), 1305 DEFINE_PROP_END_OF_LIST(), 1306 }; 1307 1308 static const VMStateDescription vmstate_virtio_scsi = { 1309 .name = "virtio-scsi", 1310 .minimum_version_id = 1, 1311 .version_id = 1, 1312 .fields = (const VMStateField[]) { 1313 VMSTATE_VIRTIO_DEVICE, 1314 VMSTATE_END_OF_LIST() 1315 }, 1316 }; 1317 1318 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) 1319 { 1320 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1321 DeviceClass *dc = DEVICE_CLASS(klass); 1322 1323 vdc->get_config = virtio_scsi_get_config; 1324 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1325 } 1326 1327 static void virtio_scsi_class_init(ObjectClass *klass, void *data) 1328 { 1329 DeviceClass *dc = DEVICE_CLASS(klass); 1330 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1331 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 1332 1333 device_class_set_props(dc, virtio_scsi_properties); 1334 dc->vmsd = &vmstate_virtio_scsi; 1335 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1336 vdc->realize = virtio_scsi_device_realize; 1337 vdc->unrealize = virtio_scsi_device_unrealize; 1338 vdc->set_config = virtio_scsi_set_config; 1339 vdc->get_features = virtio_scsi_get_features; 1340 vdc->reset = virtio_scsi_reset; 1341 vdc->start_ioeventfd = virtio_scsi_dataplane_start; 1342 vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; 1343 hc->pre_plug = virtio_scsi_pre_hotplug; 1344 hc->plug = virtio_scsi_hotplug; 1345 hc->unplug = virtio_scsi_hotunplug; 1346 } 1347 1348 static const TypeInfo virtio_scsi_common_info = { 1349 .name = TYPE_VIRTIO_SCSI_COMMON, 1350 .parent = TYPE_VIRTIO_DEVICE, 1351 .instance_size = sizeof(VirtIOSCSICommon), 1352 .abstract = true, 1353 .class_init = virtio_scsi_common_class_init, 1354 }; 1355 1356 static const TypeInfo virtio_scsi_info = { 1357 .name = TYPE_VIRTIO_SCSI, 1358 .parent = TYPE_VIRTIO_SCSI_COMMON, 1359 .instance_size = sizeof(VirtIOSCSI), 1360 .class_init = virtio_scsi_class_init, 1361 .interfaces = (InterfaceInfo[]) { 1362 { TYPE_HOTPLUG_HANDLER }, 1363 { } 1364 } 1365 }; 1366 1367 static void virtio_register_types(void) 1368 { 1369 type_register_static(&virtio_scsi_common_info); 1370 type_register_static(&virtio_scsi_info); 1371 } 1372 1373 type_init(virtio_register_types) 1374