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 "hw/qdev-properties.h" 26 #include "hw/scsi/scsi.h" 27 #include "scsi/constants.h" 28 #include "hw/virtio/virtio-bus.h" 29 #include "hw/virtio/virtio-access.h" 30 31 static inline int virtio_scsi_get_lun(uint8_t *lun) 32 { 33 return ((lun[2] << 8) | lun[3]) & 0x3FFF; 34 } 35 36 static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) 37 { 38 if (lun[0] != 1) { 39 return NULL; 40 } 41 if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { 42 return NULL; 43 } 44 return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); 45 } 46 47 void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) 48 { 49 VirtIODevice *vdev = VIRTIO_DEVICE(s); 50 const size_t zero_skip = 51 offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov); 52 53 req->vq = vq; 54 req->dev = s; 55 qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as); 56 qemu_iovec_init(&req->resp_iov, 1); 57 memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip); 58 } 59 60 void virtio_scsi_free_req(VirtIOSCSIReq *req) 61 { 62 qemu_iovec_destroy(&req->resp_iov); 63 qemu_sglist_destroy(&req->qsgl); 64 g_free(req); 65 } 66 67 static void virtio_scsi_complete_req(VirtIOSCSIReq *req) 68 { 69 VirtIOSCSI *s = req->dev; 70 VirtQueue *vq = req->vq; 71 VirtIODevice *vdev = VIRTIO_DEVICE(s); 72 73 qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); 74 virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); 75 if (s->dataplane_started && !s->dataplane_fenced) { 76 virtio_notify_irqfd(vdev, vq); 77 } else { 78 virtio_notify(vdev, vq); 79 } 80 81 if (req->sreq) { 82 req->sreq->hba_private = NULL; 83 scsi_req_unref(req->sreq); 84 } 85 virtio_scsi_free_req(req); 86 } 87 88 static void virtio_scsi_bad_req(VirtIOSCSIReq *req) 89 { 90 virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers"); 91 virtqueue_detach_element(req->vq, &req->elem, 0); 92 virtio_scsi_free_req(req); 93 } 94 95 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, 96 hwaddr *addr, int num, size_t skip) 97 { 98 QEMUSGList *qsgl = &req->qsgl; 99 size_t copied = 0; 100 101 while (num) { 102 if (skip >= iov->iov_len) { 103 skip -= iov->iov_len; 104 } else { 105 qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); 106 copied += iov->iov_len - skip; 107 skip = 0; 108 } 109 iov++; 110 addr++; 111 num--; 112 } 113 114 assert(skip == 0); 115 return copied; 116 } 117 118 static int virtio_scsi_parse_req(VirtIOSCSIReq *req, 119 unsigned req_size, unsigned resp_size) 120 { 121 VirtIODevice *vdev = (VirtIODevice *) req->dev; 122 size_t in_size, out_size; 123 124 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 125 &req->req, req_size) < req_size) { 126 return -EINVAL; 127 } 128 129 if (qemu_iovec_concat_iov(&req->resp_iov, 130 req->elem.in_sg, req->elem.in_num, 0, 131 resp_size) < resp_size) { 132 return -EINVAL; 133 } 134 135 req->resp_size = resp_size; 136 137 /* Old BIOSes left some padding by mistake after the req_size/resp_size. 138 * As a workaround, always consider the first buffer as the virtio-scsi 139 * request/response, making the payload start at the second element 140 * of the iovec. 141 * 142 * The actual length of the response header, stored in req->resp_size, 143 * does not change. 144 * 145 * TODO: always disable this workaround for virtio 1.0 devices. 146 */ 147 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) { 148 if (req->elem.out_num) { 149 req_size = req->elem.out_sg[0].iov_len; 150 } 151 if (req->elem.in_num) { 152 resp_size = req->elem.in_sg[0].iov_len; 153 } 154 } 155 156 out_size = qemu_sgl_concat(req, req->elem.out_sg, 157 &req->elem.out_addr[0], req->elem.out_num, 158 req_size); 159 in_size = qemu_sgl_concat(req, req->elem.in_sg, 160 &req->elem.in_addr[0], req->elem.in_num, 161 resp_size); 162 163 if (out_size && in_size) { 164 return -ENOTSUP; 165 } 166 167 if (out_size) { 168 req->mode = SCSI_XFER_TO_DEV; 169 } else if (in_size) { 170 req->mode = SCSI_XFER_FROM_DEV; 171 } 172 173 return 0; 174 } 175 176 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) 177 { 178 VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s; 179 VirtIOSCSIReq *req; 180 181 req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size); 182 if (!req) { 183 return NULL; 184 } 185 virtio_scsi_init_req(s, vq, req); 186 return req; 187 } 188 189 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) 190 { 191 VirtIOSCSIReq *req = sreq->hba_private; 192 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); 193 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 194 uint32_t n = virtio_get_queue_index(req->vq) - 2; 195 196 assert(n < vs->conf.num_queues); 197 qemu_put_be32s(f, &n); 198 qemu_put_virtqueue_element(vdev, f, &req->elem); 199 } 200 201 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) 202 { 203 SCSIBus *bus = sreq->bus; 204 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 205 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 206 VirtIODevice *vdev = VIRTIO_DEVICE(s); 207 VirtIOSCSIReq *req; 208 uint32_t n; 209 210 qemu_get_be32s(f, &n); 211 assert(n < vs->conf.num_queues); 212 req = qemu_get_virtqueue_element(vdev, f, 213 sizeof(VirtIOSCSIReq) + vs->cdb_size); 214 virtio_scsi_init_req(s, vs->cmd_vqs[n], req); 215 216 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 217 sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { 218 error_report("invalid SCSI request migration data"); 219 exit(1); 220 } 221 222 scsi_req_ref(sreq); 223 req->sreq = sreq; 224 if (req->sreq->cmd.mode != SCSI_XFER_NONE) { 225 assert(req->sreq->cmd.mode == req->mode); 226 } 227 return req; 228 } 229 230 typedef struct { 231 Notifier notifier; 232 VirtIOSCSIReq *tmf_req; 233 } VirtIOSCSICancelNotifier; 234 235 static void virtio_scsi_cancel_notify(Notifier *notifier, void *data) 236 { 237 VirtIOSCSICancelNotifier *n = container_of(notifier, 238 VirtIOSCSICancelNotifier, 239 notifier); 240 241 if (--n->tmf_req->remaining == 0) { 242 virtio_scsi_complete_req(n->tmf_req); 243 } 244 g_free(n); 245 } 246 247 static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d) 248 { 249 if (s->dataplane_started && d && blk_is_available(d->conf.blk)) { 250 assert(blk_get_aio_context(d->conf.blk) == s->ctx); 251 } 252 } 253 254 /* Return 0 if the request is ready to be completed and return to guest; 255 * -EINPROGRESS if the request is submitted and will be completed later, in the 256 * case of async cancellation. */ 257 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) 258 { 259 SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf.lun); 260 SCSIRequest *r, *next; 261 BusChild *kid; 262 int target; 263 int ret = 0; 264 265 virtio_scsi_ctx_check(s, d); 266 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ 267 req->resp.tmf.response = VIRTIO_SCSI_S_OK; 268 269 /* 270 * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() 271 * to avoid compiler errors. 272 */ 273 req->req.tmf.subtype = 274 virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); 275 276 switch (req->req.tmf.subtype) { 277 case VIRTIO_SCSI_T_TMF_ABORT_TASK: 278 case VIRTIO_SCSI_T_TMF_QUERY_TASK: 279 if (!d) { 280 goto fail; 281 } 282 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 283 goto incorrect_lun; 284 } 285 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 286 VirtIOSCSIReq *cmd_req = r->hba_private; 287 if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { 288 break; 289 } 290 } 291 if (r) { 292 /* 293 * Assert that the request has not been completed yet, we 294 * check for it in the loop above. 295 */ 296 assert(r->hba_private); 297 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { 298 /* "If the specified command is present in the task set, then 299 * return a service response set to FUNCTION SUCCEEDED". 300 */ 301 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 302 } else { 303 VirtIOSCSICancelNotifier *notifier; 304 305 req->remaining = 1; 306 notifier = g_new(VirtIOSCSICancelNotifier, 1); 307 notifier->tmf_req = req; 308 notifier->notifier.notify = virtio_scsi_cancel_notify; 309 scsi_req_cancel_async(r, ¬ifier->notifier); 310 ret = -EINPROGRESS; 311 } 312 } 313 break; 314 315 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 316 if (!d) { 317 goto fail; 318 } 319 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 320 goto incorrect_lun; 321 } 322 s->resetting++; 323 qdev_reset_all(&d->qdev); 324 s->resetting--; 325 break; 326 327 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: 328 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: 329 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: 330 if (!d) { 331 goto fail; 332 } 333 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 334 goto incorrect_lun; 335 } 336 337 /* Add 1 to "remaining" until virtio_scsi_do_tmf returns. 338 * This way, if the bus starts calling back to the notifiers 339 * even before we finish the loop, virtio_scsi_cancel_notify 340 * will not complete the TMF too early. 341 */ 342 req->remaining = 1; 343 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 344 if (r->hba_private) { 345 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { 346 /* "If there is any command present in the task set, then 347 * return a service response set to FUNCTION SUCCEEDED". 348 */ 349 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 350 break; 351 } else { 352 VirtIOSCSICancelNotifier *notifier; 353 354 req->remaining++; 355 notifier = g_new(VirtIOSCSICancelNotifier, 1); 356 notifier->notifier.notify = virtio_scsi_cancel_notify; 357 notifier->tmf_req = req; 358 scsi_req_cancel_async(r, ¬ifier->notifier); 359 } 360 } 361 } 362 if (--req->remaining > 0) { 363 ret = -EINPROGRESS; 364 } 365 break; 366 367 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 368 target = req->req.tmf.lun[1]; 369 s->resetting++; 370 QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { 371 d = SCSI_DEVICE(kid->child); 372 if (d->channel == 0 && d->id == target) { 373 qdev_reset_all(&d->qdev); 374 } 375 } 376 s->resetting--; 377 break; 378 379 case VIRTIO_SCSI_T_TMF_CLEAR_ACA: 380 default: 381 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; 382 break; 383 } 384 385 return ret; 386 387 incorrect_lun: 388 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 389 return ret; 390 391 fail: 392 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 393 return ret; 394 } 395 396 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) 397 { 398 VirtIODevice *vdev = (VirtIODevice *)s; 399 uint32_t type; 400 int r = 0; 401 402 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 403 &type, sizeof(type)) < sizeof(type)) { 404 virtio_scsi_bad_req(req); 405 return; 406 } 407 408 virtio_tswap32s(vdev, &type); 409 if (type == VIRTIO_SCSI_T_TMF) { 410 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), 411 sizeof(VirtIOSCSICtrlTMFResp)) < 0) { 412 virtio_scsi_bad_req(req); 413 return; 414 } else { 415 r = virtio_scsi_do_tmf(s, req); 416 } 417 418 } else if (type == VIRTIO_SCSI_T_AN_QUERY || 419 type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { 420 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), 421 sizeof(VirtIOSCSICtrlANResp)) < 0) { 422 virtio_scsi_bad_req(req); 423 return; 424 } else { 425 req->resp.an.event_actual = 0; 426 req->resp.an.response = VIRTIO_SCSI_S_OK; 427 } 428 } 429 if (r == 0) { 430 virtio_scsi_complete_req(req); 431 } else { 432 assert(r == -EINPROGRESS); 433 } 434 } 435 436 bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) 437 { 438 VirtIOSCSIReq *req; 439 bool progress = false; 440 441 while ((req = virtio_scsi_pop_req(s, vq))) { 442 progress = true; 443 virtio_scsi_handle_ctrl_req(s, req); 444 } 445 return progress; 446 } 447 448 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 449 { 450 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 451 452 if (s->ctx) { 453 virtio_device_start_ioeventfd(vdev); 454 if (!s->dataplane_fenced) { 455 return; 456 } 457 } 458 virtio_scsi_acquire(s); 459 virtio_scsi_handle_ctrl_vq(s, vq); 460 virtio_scsi_release(s); 461 } 462 463 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) 464 { 465 /* Sense data is not in req->resp and is copied separately 466 * in virtio_scsi_command_complete. 467 */ 468 req->resp_size = sizeof(VirtIOSCSICmdResp); 469 virtio_scsi_complete_req(req); 470 } 471 472 static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, 473 size_t resid) 474 { 475 VirtIOSCSIReq *req = r->hba_private; 476 uint8_t sense[SCSI_SENSE_BUF_SIZE]; 477 uint32_t sense_len; 478 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 479 480 if (r->io_canceled) { 481 return; 482 } 483 484 req->resp.cmd.response = VIRTIO_SCSI_S_OK; 485 req->resp.cmd.status = status; 486 if (req->resp.cmd.status == GOOD) { 487 req->resp.cmd.resid = virtio_tswap32(vdev, resid); 488 } else { 489 req->resp.cmd.resid = 0; 490 sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); 491 sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); 492 qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), 493 sense, sense_len); 494 req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); 495 } 496 virtio_scsi_complete_cmd_req(req); 497 } 498 499 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, 500 uint8_t *buf, void *hba_private) 501 { 502 VirtIOSCSIReq *req = hba_private; 503 504 if (cmd->len == 0) { 505 cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); 506 memcpy(cmd->buf, buf, cmd->len); 507 } 508 509 /* Extract the direction and mode directly from the request, for 510 * host device passthrough. 511 */ 512 cmd->xfer = req->qsgl.size; 513 cmd->mode = req->mode; 514 return 0; 515 } 516 517 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) 518 { 519 VirtIOSCSIReq *req = r->hba_private; 520 521 return &req->qsgl; 522 } 523 524 static void virtio_scsi_request_cancelled(SCSIRequest *r) 525 { 526 VirtIOSCSIReq *req = r->hba_private; 527 528 if (!req) { 529 return; 530 } 531 if (req->dev->resetting) { 532 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 533 } else { 534 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 535 } 536 virtio_scsi_complete_cmd_req(req); 537 } 538 539 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) 540 { 541 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 542 virtio_scsi_complete_cmd_req(req); 543 } 544 545 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) 546 { 547 VirtIOSCSICommon *vs = &s->parent_obj; 548 SCSIDevice *d; 549 int rc; 550 551 rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 552 sizeof(VirtIOSCSICmdResp) + vs->sense_size); 553 if (rc < 0) { 554 if (rc == -ENOTSUP) { 555 virtio_scsi_fail_cmd_req(req); 556 return -ENOTSUP; 557 } else { 558 virtio_scsi_bad_req(req); 559 return -EINVAL; 560 } 561 } 562 563 d = virtio_scsi_device_find(s, req->req.cmd.lun); 564 if (!d) { 565 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 566 virtio_scsi_complete_cmd_req(req); 567 return -ENOENT; 568 } 569 virtio_scsi_ctx_check(s, d); 570 req->sreq = scsi_req_new(d, req->req.cmd.tag, 571 virtio_scsi_get_lun(req->req.cmd.lun), 572 req->req.cmd.cdb, req); 573 574 if (req->sreq->cmd.mode != SCSI_XFER_NONE 575 && (req->sreq->cmd.mode != req->mode || 576 req->sreq->cmd.xfer > req->qsgl.size)) { 577 req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; 578 virtio_scsi_complete_cmd_req(req); 579 return -ENOBUFS; 580 } 581 scsi_req_ref(req->sreq); 582 blk_io_plug(d->conf.blk); 583 return 0; 584 } 585 586 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) 587 { 588 SCSIRequest *sreq = req->sreq; 589 if (scsi_req_enqueue(sreq)) { 590 scsi_req_continue(sreq); 591 } 592 blk_io_unplug(sreq->dev->conf.blk); 593 scsi_req_unref(sreq); 594 } 595 596 bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) 597 { 598 VirtIOSCSIReq *req, *next; 599 int ret = 0; 600 bool progress = false; 601 602 QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); 603 604 do { 605 virtio_queue_set_notification(vq, 0); 606 607 while ((req = virtio_scsi_pop_req(s, vq))) { 608 progress = true; 609 ret = virtio_scsi_handle_cmd_req_prepare(s, req); 610 if (!ret) { 611 QTAILQ_INSERT_TAIL(&reqs, req, next); 612 } else if (ret == -EINVAL) { 613 /* The device is broken and shouldn't process any request */ 614 while (!QTAILQ_EMPTY(&reqs)) { 615 req = QTAILQ_FIRST(&reqs); 616 QTAILQ_REMOVE(&reqs, req, next); 617 blk_io_unplug(req->sreq->dev->conf.blk); 618 scsi_req_unref(req->sreq); 619 virtqueue_detach_element(req->vq, &req->elem, 0); 620 virtio_scsi_free_req(req); 621 } 622 } 623 } 624 625 virtio_queue_set_notification(vq, 1); 626 } while (ret != -EINVAL && !virtio_queue_empty(vq)); 627 628 QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { 629 virtio_scsi_handle_cmd_req_submit(s, req); 630 } 631 return progress; 632 } 633 634 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) 635 { 636 /* use non-QOM casts in the data path */ 637 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 638 639 if (s->ctx) { 640 virtio_device_start_ioeventfd(vdev); 641 if (!s->dataplane_fenced) { 642 return; 643 } 644 } 645 virtio_scsi_acquire(s); 646 virtio_scsi_handle_cmd_vq(s, vq); 647 virtio_scsi_release(s); 648 } 649 650 static void virtio_scsi_get_config(VirtIODevice *vdev, 651 uint8_t *config) 652 { 653 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 654 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); 655 656 virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); 657 virtio_stl_p(vdev, &scsiconf->seg_max, 128 - 2); 658 virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); 659 virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); 660 virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); 661 virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); 662 virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); 663 virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); 664 virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); 665 virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); 666 } 667 668 static void virtio_scsi_set_config(VirtIODevice *vdev, 669 const uint8_t *config) 670 { 671 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 672 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 673 674 if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || 675 (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { 676 virtio_error(vdev, 677 "bad data written to virtio-scsi configuration space"); 678 return; 679 } 680 681 vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); 682 vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); 683 } 684 685 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, 686 uint64_t requested_features, 687 Error **errp) 688 { 689 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 690 691 /* Firstly sync all virtio-scsi possible supported features */ 692 requested_features |= s->host_features; 693 return requested_features; 694 } 695 696 static void virtio_scsi_reset(VirtIODevice *vdev) 697 { 698 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 699 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 700 701 assert(!s->dataplane_started); 702 s->resetting++; 703 qbus_reset_all(BUS(&s->bus)); 704 s->resetting--; 705 706 vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 707 vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 708 s->events_dropped = false; 709 } 710 711 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, 712 uint32_t event, uint32_t reason) 713 { 714 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 715 VirtIOSCSIReq *req; 716 VirtIOSCSIEvent *evt; 717 VirtIODevice *vdev = VIRTIO_DEVICE(s); 718 719 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 720 return; 721 } 722 723 req = virtio_scsi_pop_req(s, vs->event_vq); 724 if (!req) { 725 s->events_dropped = true; 726 return; 727 } 728 729 if (s->events_dropped) { 730 event |= VIRTIO_SCSI_T_EVENTS_MISSED; 731 s->events_dropped = false; 732 } 733 734 if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { 735 virtio_scsi_bad_req(req); 736 return; 737 } 738 739 evt = &req->resp.event; 740 memset(evt, 0, sizeof(VirtIOSCSIEvent)); 741 evt->event = virtio_tswap32(vdev, event); 742 evt->reason = virtio_tswap32(vdev, reason); 743 if (!dev) { 744 assert(event == VIRTIO_SCSI_T_EVENTS_MISSED); 745 } else { 746 evt->lun[0] = 1; 747 evt->lun[1] = dev->id; 748 749 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ 750 if (dev->lun >= 256) { 751 evt->lun[2] = (dev->lun >> 8) | 0x40; 752 } 753 evt->lun[3] = dev->lun & 0xFF; 754 } 755 virtio_scsi_complete_req(req); 756 } 757 758 bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) 759 { 760 if (s->events_dropped) { 761 virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); 762 return true; 763 } 764 return false; 765 } 766 767 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) 768 { 769 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 770 771 if (s->ctx) { 772 virtio_device_start_ioeventfd(vdev); 773 if (!s->dataplane_fenced) { 774 return; 775 } 776 } 777 virtio_scsi_acquire(s); 778 virtio_scsi_handle_event_vq(s, vq); 779 virtio_scsi_release(s); 780 } 781 782 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) 783 { 784 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 785 VirtIODevice *vdev = VIRTIO_DEVICE(s); 786 787 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && 788 dev->type != TYPE_ROM) { 789 virtio_scsi_acquire(s); 790 virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, 791 sense.asc | (sense.ascq << 8)); 792 virtio_scsi_release(s); 793 } 794 } 795 796 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, 797 DeviceState *dev, Error **errp) 798 { 799 SCSIDevice *sd = SCSI_DEVICE(dev); 800 sd->hba_supports_iothread = true; 801 } 802 803 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, 804 Error **errp) 805 { 806 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 807 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 808 SCSIDevice *sd = SCSI_DEVICE(dev); 809 int ret; 810 811 if (s->ctx && !s->dataplane_fenced) { 812 if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { 813 return; 814 } 815 virtio_scsi_acquire(s); 816 ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); 817 virtio_scsi_release(s); 818 if (ret < 0) { 819 return; 820 } 821 } 822 823 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 824 virtio_scsi_acquire(s); 825 virtio_scsi_push_event(s, sd, 826 VIRTIO_SCSI_T_TRANSPORT_RESET, 827 VIRTIO_SCSI_EVT_RESET_RESCAN); 828 virtio_scsi_release(s); 829 } 830 } 831 832 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, 833 Error **errp) 834 { 835 VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); 836 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 837 SCSIDevice *sd = SCSI_DEVICE(dev); 838 AioContext *ctx = s->ctx ?: qemu_get_aio_context(); 839 840 if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { 841 virtio_scsi_acquire(s); 842 virtio_scsi_push_event(s, sd, 843 VIRTIO_SCSI_T_TRANSPORT_RESET, 844 VIRTIO_SCSI_EVT_RESET_REMOVED); 845 virtio_scsi_release(s); 846 } 847 848 aio_disable_external(ctx); 849 qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); 850 aio_enable_external(ctx); 851 852 if (s->ctx) { 853 virtio_scsi_acquire(s); 854 /* If other users keep the BlockBackend in the iothread, that's ok */ 855 blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); 856 virtio_scsi_release(s); 857 } 858 } 859 860 static struct SCSIBusInfo virtio_scsi_scsi_info = { 861 .tcq = true, 862 .max_channel = VIRTIO_SCSI_MAX_CHANNEL, 863 .max_target = VIRTIO_SCSI_MAX_TARGET, 864 .max_lun = VIRTIO_SCSI_MAX_LUN, 865 866 .complete = virtio_scsi_command_complete, 867 .cancel = virtio_scsi_request_cancelled, 868 .change = virtio_scsi_change, 869 .parse_cdb = virtio_scsi_parse_cdb, 870 .get_sg_list = virtio_scsi_get_sg_list, 871 .save_request = virtio_scsi_save_request, 872 .load_request = virtio_scsi_load_request, 873 }; 874 875 void virtio_scsi_common_realize(DeviceState *dev, 876 VirtIOHandleOutput ctrl, 877 VirtIOHandleOutput evt, 878 VirtIOHandleOutput cmd, 879 Error **errp) 880 { 881 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 882 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); 883 int i; 884 885 virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI, 886 sizeof(VirtIOSCSIConfig)); 887 888 if (s->conf.num_queues == 0 || 889 s->conf.num_queues > VIRTIO_QUEUE_MAX - 2) { 890 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " 891 "must be a positive integer less than %d.", 892 s->conf.num_queues, VIRTIO_QUEUE_MAX - 2); 893 virtio_cleanup(vdev); 894 return; 895 } 896 s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); 897 s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; 898 s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; 899 900 s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); 901 s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); 902 for (i = 0; i < s->conf.num_queues; i++) { 903 s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); 904 } 905 } 906 907 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) 908 { 909 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 910 VirtIOSCSI *s = VIRTIO_SCSI(dev); 911 Error *err = NULL; 912 913 virtio_scsi_common_realize(dev, 914 virtio_scsi_handle_ctrl, 915 virtio_scsi_handle_event, 916 virtio_scsi_handle_cmd, 917 &err); 918 if (err != NULL) { 919 error_propagate(errp, err); 920 return; 921 } 922 923 scsi_bus_new(&s->bus, sizeof(s->bus), dev, 924 &virtio_scsi_scsi_info, vdev->bus_name); 925 /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ 926 qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev), &error_abort); 927 928 virtio_scsi_dataplane_setup(s, errp); 929 } 930 931 void virtio_scsi_common_unrealize(DeviceState *dev) 932 { 933 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 934 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 935 936 g_free(vs->cmd_vqs); 937 virtio_cleanup(vdev); 938 } 939 940 static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp) 941 { 942 VirtIOSCSI *s = VIRTIO_SCSI(dev); 943 944 qbus_set_hotplug_handler(BUS(&s->bus), NULL, &error_abort); 945 virtio_scsi_common_unrealize(dev); 946 } 947 948 static Property virtio_scsi_properties[] = { 949 DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1), 950 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, 951 parent_obj.conf.virtqueue_size, 128), 952 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, 953 0xFFFF), 954 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, 955 128), 956 DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, 957 VIRTIO_SCSI_F_HOTPLUG, true), 958 DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, 959 VIRTIO_SCSI_F_CHANGE, true), 960 DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, 961 TYPE_IOTHREAD, IOThread *), 962 DEFINE_PROP_END_OF_LIST(), 963 }; 964 965 static const VMStateDescription vmstate_virtio_scsi = { 966 .name = "virtio-scsi", 967 .minimum_version_id = 1, 968 .version_id = 1, 969 .fields = (VMStateField[]) { 970 VMSTATE_VIRTIO_DEVICE, 971 VMSTATE_END_OF_LIST() 972 }, 973 }; 974 975 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) 976 { 977 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 978 DeviceClass *dc = DEVICE_CLASS(klass); 979 980 vdc->get_config = virtio_scsi_get_config; 981 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 982 } 983 984 static void virtio_scsi_class_init(ObjectClass *klass, void *data) 985 { 986 DeviceClass *dc = DEVICE_CLASS(klass); 987 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 988 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 989 990 dc->props = virtio_scsi_properties; 991 dc->vmsd = &vmstate_virtio_scsi; 992 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 993 vdc->realize = virtio_scsi_device_realize; 994 vdc->unrealize = virtio_scsi_device_unrealize; 995 vdc->set_config = virtio_scsi_set_config; 996 vdc->get_features = virtio_scsi_get_features; 997 vdc->reset = virtio_scsi_reset; 998 vdc->start_ioeventfd = virtio_scsi_dataplane_start; 999 vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; 1000 hc->pre_plug = virtio_scsi_pre_hotplug; 1001 hc->plug = virtio_scsi_hotplug; 1002 hc->unplug = virtio_scsi_hotunplug; 1003 } 1004 1005 static const TypeInfo virtio_scsi_common_info = { 1006 .name = TYPE_VIRTIO_SCSI_COMMON, 1007 .parent = TYPE_VIRTIO_DEVICE, 1008 .instance_size = sizeof(VirtIOSCSICommon), 1009 .abstract = true, 1010 .class_init = virtio_scsi_common_class_init, 1011 }; 1012 1013 static const TypeInfo virtio_scsi_info = { 1014 .name = TYPE_VIRTIO_SCSI, 1015 .parent = TYPE_VIRTIO_SCSI_COMMON, 1016 .instance_size = sizeof(VirtIOSCSI), 1017 .class_init = virtio_scsi_class_init, 1018 .interfaces = (InterfaceInfo[]) { 1019 { TYPE_HOTPLUG_HANDLER }, 1020 { } 1021 } 1022 }; 1023 1024 static void virtio_register_types(void) 1025 { 1026 type_register_static(&virtio_scsi_common_info); 1027 type_register_static(&virtio_scsi_info); 1028 } 1029 1030 type_init(virtio_register_types) 1031