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 "hw/virtio/virtio-scsi.h" 17 #include "qemu/error-report.h" 18 #include "qemu/iov.h" 19 #include <hw/scsi/scsi.h> 20 #include <block/scsi.h> 21 #include <hw/virtio/virtio-bus.h> 22 #include "hw/virtio/virtio-access.h" 23 24 typedef struct VirtIOSCSIReq { 25 VirtIOSCSI *dev; 26 VirtQueue *vq; 27 VirtQueueElement elem; 28 QEMUSGList qsgl; 29 SCSIRequest *sreq; 30 size_t resp_size; 31 enum SCSIXferMode mode; 32 QEMUIOVector resp_iov; 33 union { 34 VirtIOSCSICmdResp cmd; 35 VirtIOSCSICtrlTMFResp tmf; 36 VirtIOSCSICtrlANResp an; 37 VirtIOSCSIEvent event; 38 } resp; 39 union { 40 struct { 41 VirtIOSCSICmdReq cmd; 42 uint8_t cdb[]; 43 } QEMU_PACKED; 44 VirtIOSCSICtrlTMFReq tmf; 45 VirtIOSCSICtrlANReq an; 46 } req; 47 } VirtIOSCSIReq; 48 49 QEMU_BUILD_BUG_ON(offsetof(VirtIOSCSIReq, req.cdb) != 50 offsetof(VirtIOSCSIReq, req.cmd) + sizeof(VirtIOSCSICmdReq)); 51 52 static inline int virtio_scsi_get_lun(uint8_t *lun) 53 { 54 return ((lun[2] << 8) | lun[3]) & 0x3FFF; 55 } 56 57 static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) 58 { 59 if (lun[0] != 1) { 60 return NULL; 61 } 62 if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { 63 return NULL; 64 } 65 return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); 66 } 67 68 static VirtIOSCSIReq *virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq) 69 { 70 VirtIOSCSIReq *req; 71 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 72 73 req = g_malloc0(sizeof(*req) + vs->cdb_size); 74 75 req->vq = vq; 76 req->dev = s; 77 req->sreq = NULL; 78 qemu_sglist_init(&req->qsgl, DEVICE(s), 8, &address_space_memory); 79 qemu_iovec_init(&req->resp_iov, 1); 80 return req; 81 } 82 83 static void virtio_scsi_free_req(VirtIOSCSIReq *req) 84 { 85 qemu_iovec_destroy(&req->resp_iov); 86 qemu_sglist_destroy(&req->qsgl); 87 g_free(req); 88 } 89 90 static void virtio_scsi_complete_req(VirtIOSCSIReq *req) 91 { 92 VirtIOSCSI *s = req->dev; 93 VirtQueue *vq = req->vq; 94 VirtIODevice *vdev = VIRTIO_DEVICE(s); 95 96 qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); 97 virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); 98 if (req->sreq) { 99 req->sreq->hba_private = NULL; 100 scsi_req_unref(req->sreq); 101 } 102 virtio_scsi_free_req(req); 103 virtio_notify(vdev, vq); 104 } 105 106 static void virtio_scsi_bad_req(void) 107 { 108 error_report("wrong size for virtio-scsi headers"); 109 exit(1); 110 } 111 112 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, 113 hwaddr *addr, int num, size_t skip) 114 { 115 QEMUSGList *qsgl = &req->qsgl; 116 size_t copied = 0; 117 118 while (num) { 119 if (skip >= iov->iov_len) { 120 skip -= iov->iov_len; 121 } else { 122 qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); 123 copied += iov->iov_len - skip; 124 skip = 0; 125 } 126 iov++; 127 addr++; 128 num--; 129 } 130 131 assert(skip == 0); 132 return copied; 133 } 134 135 static int virtio_scsi_parse_req(VirtIOSCSIReq *req, 136 unsigned req_size, unsigned resp_size) 137 { 138 size_t in_size, out_size; 139 140 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 141 &req->req, req_size) < req_size) { 142 return -EINVAL; 143 } 144 145 if (qemu_iovec_concat_iov(&req->resp_iov, 146 req->elem.in_sg, req->elem.in_num, 0, 147 resp_size) < resp_size) { 148 return -EINVAL; 149 } 150 req->resp_size = resp_size; 151 152 out_size = qemu_sgl_concat(req, req->elem.out_sg, 153 &req->elem.out_addr[0], req->elem.out_num, 154 req_size); 155 in_size = qemu_sgl_concat(req, req->elem.in_sg, 156 &req->elem.in_addr[0], req->elem.in_num, 157 resp_size); 158 159 if (out_size && in_size) { 160 return -ENOTSUP; 161 } 162 163 if (out_size) { 164 req->mode = SCSI_XFER_TO_DEV; 165 } else if (in_size) { 166 req->mode = SCSI_XFER_FROM_DEV; 167 } 168 169 return 0; 170 } 171 172 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) 173 { 174 VirtIOSCSIReq *req = virtio_scsi_init_req(s, vq); 175 if (!virtqueue_pop(vq, &req->elem)) { 176 virtio_scsi_free_req(req); 177 return NULL; 178 } 179 return req; 180 } 181 182 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) 183 { 184 VirtIOSCSIReq *req = sreq->hba_private; 185 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); 186 uint32_t n = virtio_queue_get_id(req->vq) - 2; 187 188 assert(n < vs->conf.num_queues); 189 qemu_put_be32s(f, &n); 190 qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); 191 } 192 193 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) 194 { 195 SCSIBus *bus = sreq->bus; 196 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 197 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 198 VirtIOSCSIReq *req; 199 uint32_t n; 200 201 qemu_get_be32s(f, &n); 202 assert(n < vs->conf.num_queues); 203 req = virtio_scsi_init_req(s, vs->cmd_vqs[n]); 204 qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); 205 /* TODO: add a way for SCSIBusInfo's load_request to fail, 206 * and fail migration instead of asserting here. 207 * When we do, we might be able to re-enable NDEBUG below. 208 */ 209 #ifdef NDEBUG 210 #error building with NDEBUG is not supported 211 #endif 212 assert(req->elem.in_num <= ARRAY_SIZE(req->elem.in_sg)); 213 assert(req->elem.out_num <= ARRAY_SIZE(req->elem.out_sg)); 214 215 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 216 sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { 217 error_report("invalid SCSI request migration data"); 218 exit(1); 219 } 220 221 scsi_req_ref(sreq); 222 req->sreq = sreq; 223 if (req->sreq->cmd.mode != SCSI_XFER_NONE) { 224 assert(req->sreq->cmd.mode == req->mode); 225 } 226 return req; 227 } 228 229 static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) 230 { 231 SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf.lun); 232 SCSIRequest *r, *next; 233 BusChild *kid; 234 int target; 235 236 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ 237 req->resp.tmf.response = VIRTIO_SCSI_S_OK; 238 239 virtio_tswap32s(VIRTIO_DEVICE(s), &req->req.tmf.subtype); 240 switch (req->req.tmf.subtype) { 241 case VIRTIO_SCSI_T_TMF_ABORT_TASK: 242 case VIRTIO_SCSI_T_TMF_QUERY_TASK: 243 if (!d) { 244 goto fail; 245 } 246 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 247 goto incorrect_lun; 248 } 249 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 250 VirtIOSCSIReq *cmd_req = r->hba_private; 251 if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { 252 break; 253 } 254 } 255 if (r) { 256 /* 257 * Assert that the request has not been completed yet, we 258 * check for it in the loop above. 259 */ 260 assert(r->hba_private); 261 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { 262 /* "If the specified command is present in the task set, then 263 * return a service response set to FUNCTION SUCCEEDED". 264 */ 265 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 266 } else { 267 scsi_req_cancel(r); 268 } 269 } 270 break; 271 272 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: 273 if (!d) { 274 goto fail; 275 } 276 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 277 goto incorrect_lun; 278 } 279 s->resetting++; 280 qdev_reset_all(&d->qdev); 281 s->resetting--; 282 break; 283 284 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: 285 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: 286 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: 287 if (!d) { 288 goto fail; 289 } 290 if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { 291 goto incorrect_lun; 292 } 293 QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { 294 if (r->hba_private) { 295 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { 296 /* "If there is any command present in the task set, then 297 * return a service response set to FUNCTION SUCCEEDED". 298 */ 299 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; 300 break; 301 } else { 302 scsi_req_cancel(r); 303 } 304 } 305 } 306 break; 307 308 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: 309 target = req->req.tmf.lun[1]; 310 s->resetting++; 311 QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { 312 d = DO_UPCAST(SCSIDevice, qdev, kid->child); 313 if (d->channel == 0 && d->id == target) { 314 qdev_reset_all(&d->qdev); 315 } 316 } 317 s->resetting--; 318 break; 319 320 case VIRTIO_SCSI_T_TMF_CLEAR_ACA: 321 default: 322 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; 323 break; 324 } 325 326 return; 327 328 incorrect_lun: 329 req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; 330 return; 331 332 fail: 333 req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; 334 } 335 336 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) 337 { 338 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 339 VirtIOSCSIReq *req; 340 341 while ((req = virtio_scsi_pop_req(s, vq))) { 342 int type; 343 344 if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, 345 &type, sizeof(type)) < sizeof(type)) { 346 virtio_scsi_bad_req(); 347 continue; 348 } 349 350 virtio_tswap32s(vdev, &req->req.tmf.type); 351 if (req->req.tmf.type == VIRTIO_SCSI_T_TMF) { 352 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), 353 sizeof(VirtIOSCSICtrlTMFResp)) < 0) { 354 virtio_scsi_bad_req(); 355 } else { 356 virtio_scsi_do_tmf(s, req); 357 } 358 359 } else if (req->req.tmf.type == VIRTIO_SCSI_T_AN_QUERY || 360 req->req.tmf.type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { 361 if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), 362 sizeof(VirtIOSCSICtrlANResp)) < 0) { 363 virtio_scsi_bad_req(); 364 } else { 365 req->resp.an.event_actual = 0; 366 req->resp.an.response = VIRTIO_SCSI_S_OK; 367 } 368 } 369 virtio_scsi_complete_req(req); 370 } 371 } 372 373 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) 374 { 375 /* Sense data is not in req->resp and is copied separately 376 * in virtio_scsi_command_complete. 377 */ 378 req->resp_size = sizeof(VirtIOSCSICmdResp); 379 virtio_scsi_complete_req(req); 380 } 381 382 static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, 383 size_t resid) 384 { 385 VirtIOSCSIReq *req = r->hba_private; 386 uint8_t sense[SCSI_SENSE_BUF_SIZE]; 387 uint32_t sense_len; 388 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 389 390 if (r->io_canceled) { 391 return; 392 } 393 394 req->resp.cmd.response = VIRTIO_SCSI_S_OK; 395 req->resp.cmd.status = status; 396 if (req->resp.cmd.status == GOOD) { 397 req->resp.cmd.resid = virtio_tswap32(vdev, resid); 398 } else { 399 req->resp.cmd.resid = 0; 400 sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); 401 sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); 402 qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), 403 &req->resp, sense_len); 404 req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); 405 } 406 virtio_scsi_complete_cmd_req(req); 407 } 408 409 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, 410 uint8_t *buf, void *hba_private) 411 { 412 VirtIOSCSIReq *req = hba_private; 413 414 if (cmd->len == 0) { 415 cmd->len = MIN(VIRTIO_SCSI_CDB_SIZE, SCSI_CMD_BUF_SIZE); 416 memcpy(cmd->buf, buf, cmd->len); 417 } 418 419 /* Extract the direction and mode directly from the request, for 420 * host device passthrough. 421 */ 422 cmd->xfer = req->qsgl.size; 423 if (cmd->xfer == 0) { 424 cmd->mode = SCSI_XFER_NONE; 425 } else if (iov_size(req->elem.in_sg, req->elem.in_num) > req->resp_size) { 426 cmd->mode = SCSI_XFER_FROM_DEV; 427 } else { 428 cmd->mode = SCSI_XFER_TO_DEV; 429 } 430 return 0; 431 } 432 433 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) 434 { 435 VirtIOSCSIReq *req = r->hba_private; 436 437 return &req->qsgl; 438 } 439 440 static void virtio_scsi_request_cancelled(SCSIRequest *r) 441 { 442 VirtIOSCSIReq *req = r->hba_private; 443 444 if (!req) { 445 return; 446 } 447 if (req->dev->resetting) { 448 req->resp.cmd.response = VIRTIO_SCSI_S_RESET; 449 } else { 450 req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; 451 } 452 virtio_scsi_complete_cmd_req(req); 453 } 454 455 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) 456 { 457 req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; 458 virtio_scsi_complete_cmd_req(req); 459 } 460 461 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) 462 { 463 /* use non-QOM casts in the data path */ 464 VirtIOSCSI *s = (VirtIOSCSI *)vdev; 465 VirtIOSCSICommon *vs = &s->parent_obj; 466 467 VirtIOSCSIReq *req; 468 int n; 469 470 while ((req = virtio_scsi_pop_req(s, vq))) { 471 SCSIDevice *d; 472 int rc; 473 474 rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, 475 sizeof(VirtIOSCSICmdResp) + vs->sense_size); 476 if (rc < 0) { 477 if (rc == -ENOTSUP) { 478 virtio_scsi_fail_cmd_req(req); 479 } else { 480 virtio_scsi_bad_req(); 481 } 482 continue; 483 } 484 485 d = virtio_scsi_device_find(s, req->req.cmd.lun); 486 if (!d) { 487 req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; 488 virtio_scsi_complete_cmd_req(req); 489 continue; 490 } 491 req->sreq = scsi_req_new(d, req->req.cmd.tag, 492 virtio_scsi_get_lun(req->req.cmd.lun), 493 req->req.cdb, req); 494 495 if (req->sreq->cmd.mode != SCSI_XFER_NONE 496 && (req->sreq->cmd.mode != req->mode || 497 req->sreq->cmd.xfer > req->qsgl.size)) { 498 req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; 499 virtio_scsi_complete_cmd_req(req); 500 continue; 501 } 502 503 n = scsi_req_enqueue(req->sreq); 504 if (n) { 505 scsi_req_continue(req->sreq); 506 } 507 } 508 } 509 510 static void virtio_scsi_get_config(VirtIODevice *vdev, 511 uint8_t *config) 512 { 513 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 514 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); 515 516 virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); 517 virtio_stl_p(vdev, &scsiconf->seg_max, 128 - 2); 518 virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); 519 virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); 520 virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); 521 virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); 522 virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); 523 virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); 524 virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); 525 virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); 526 } 527 528 static void virtio_scsi_set_config(VirtIODevice *vdev, 529 const uint8_t *config) 530 { 531 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 532 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 533 534 if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || 535 (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { 536 error_report("bad data written to virtio-scsi configuration space"); 537 exit(1); 538 } 539 540 vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); 541 vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); 542 } 543 544 static uint32_t virtio_scsi_get_features(VirtIODevice *vdev, 545 uint32_t requested_features) 546 { 547 return requested_features; 548 } 549 550 static void virtio_scsi_reset(VirtIODevice *vdev) 551 { 552 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 553 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 554 555 s->resetting++; 556 qbus_reset_all(&s->bus.qbus); 557 s->resetting--; 558 559 vs->sense_size = VIRTIO_SCSI_SENSE_SIZE; 560 vs->cdb_size = VIRTIO_SCSI_CDB_SIZE; 561 s->events_dropped = false; 562 } 563 564 /* The device does not have anything to save beyond the virtio data. 565 * Request data is saved with callbacks from SCSI devices. 566 */ 567 static void virtio_scsi_save(QEMUFile *f, void *opaque) 568 { 569 VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 570 virtio_save(vdev, f); 571 } 572 573 static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) 574 { 575 VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 576 int ret; 577 578 ret = virtio_load(vdev, f, version_id); 579 if (ret) { 580 return ret; 581 } 582 return 0; 583 } 584 585 static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, 586 uint32_t event, uint32_t reason) 587 { 588 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); 589 VirtIOSCSIReq *req; 590 VirtIOSCSIEvent *evt; 591 VirtIODevice *vdev = VIRTIO_DEVICE(s); 592 593 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { 594 return; 595 } 596 597 req = virtio_scsi_pop_req(s, vs->event_vq); 598 if (!req) { 599 s->events_dropped = true; 600 return; 601 } 602 603 if (s->events_dropped) { 604 event |= VIRTIO_SCSI_T_EVENTS_MISSED; 605 s->events_dropped = false; 606 } 607 608 if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { 609 virtio_scsi_bad_req(); 610 } 611 612 evt = &req->resp.event; 613 memset(evt, 0, sizeof(VirtIOSCSIEvent)); 614 evt->event = virtio_tswap32(vdev, event); 615 evt->reason = virtio_tswap32(vdev, reason); 616 if (!dev) { 617 assert(event == VIRTIO_SCSI_T_EVENTS_MISSED); 618 } else { 619 evt->lun[0] = 1; 620 evt->lun[1] = dev->id; 621 622 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ 623 if (dev->lun >= 256) { 624 evt->lun[2] = (dev->lun >> 8) | 0x40; 625 } 626 evt->lun[3] = dev->lun & 0xFF; 627 } 628 virtio_scsi_complete_req(req); 629 } 630 631 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) 632 { 633 VirtIOSCSI *s = VIRTIO_SCSI(vdev); 634 635 if (s->events_dropped) { 636 virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); 637 } 638 } 639 640 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) 641 { 642 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 643 VirtIODevice *vdev = VIRTIO_DEVICE(s); 644 645 if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && 646 dev->type != TYPE_ROM) { 647 virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, 648 sense.asc | (sense.ascq << 8)); 649 } 650 } 651 652 static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev) 653 { 654 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 655 VirtIODevice *vdev = VIRTIO_DEVICE(s); 656 657 if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { 658 virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, 659 VIRTIO_SCSI_EVT_RESET_RESCAN); 660 } 661 } 662 663 static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev) 664 { 665 VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); 666 VirtIODevice *vdev = VIRTIO_DEVICE(s); 667 668 if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { 669 virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, 670 VIRTIO_SCSI_EVT_RESET_REMOVED); 671 } 672 } 673 674 static struct SCSIBusInfo virtio_scsi_scsi_info = { 675 .tcq = true, 676 .max_channel = VIRTIO_SCSI_MAX_CHANNEL, 677 .max_target = VIRTIO_SCSI_MAX_TARGET, 678 .max_lun = VIRTIO_SCSI_MAX_LUN, 679 680 .complete = virtio_scsi_command_complete, 681 .cancel = virtio_scsi_request_cancelled, 682 .change = virtio_scsi_change, 683 .hotplug = virtio_scsi_hotplug, 684 .hot_unplug = virtio_scsi_hot_unplug, 685 .parse_cdb = virtio_scsi_parse_cdb, 686 .get_sg_list = virtio_scsi_get_sg_list, 687 .save_request = virtio_scsi_save_request, 688 .load_request = virtio_scsi_load_request, 689 }; 690 691 void virtio_scsi_common_realize(DeviceState *dev, Error **errp, 692 HandleOutput ctrl, HandleOutput evt, 693 HandleOutput cmd) 694 { 695 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 696 VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); 697 int i; 698 699 virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI, 700 sizeof(VirtIOSCSIConfig)); 701 702 s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *)); 703 s->sense_size = VIRTIO_SCSI_SENSE_SIZE; 704 s->cdb_size = VIRTIO_SCSI_CDB_SIZE; 705 706 s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE, 707 ctrl); 708 s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE, 709 evt); 710 for (i = 0; i < s->conf.num_queues; i++) { 711 s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE, 712 cmd); 713 } 714 } 715 716 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) 717 { 718 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 719 VirtIOSCSI *s = VIRTIO_SCSI(dev); 720 static int virtio_scsi_id; 721 Error *err = NULL; 722 723 virtio_scsi_common_realize(dev, &err, virtio_scsi_handle_ctrl, 724 virtio_scsi_handle_event, 725 virtio_scsi_handle_cmd); 726 if (err != NULL) { 727 error_propagate(errp, err); 728 return; 729 } 730 731 scsi_bus_new(&s->bus, sizeof(s->bus), dev, 732 &virtio_scsi_scsi_info, vdev->bus_name); 733 734 if (!dev->hotplugged) { 735 scsi_bus_legacy_handle_cmdline(&s->bus, &err); 736 if (err != NULL) { 737 error_propagate(errp, err); 738 return; 739 } 740 } 741 742 register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, 743 virtio_scsi_save, virtio_scsi_load, s); 744 } 745 746 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp) 747 { 748 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 749 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 750 751 g_free(vs->cmd_vqs); 752 virtio_cleanup(vdev); 753 } 754 755 static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp) 756 { 757 VirtIOSCSI *s = VIRTIO_SCSI(dev); 758 759 unregister_savevm(dev, "virtio-scsi", s); 760 761 virtio_scsi_common_unrealize(dev, errp); 762 } 763 764 static Property virtio_scsi_properties[] = { 765 DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, parent_obj.conf), 766 DEFINE_PROP_END_OF_LIST(), 767 }; 768 769 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) 770 { 771 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 772 DeviceClass *dc = DEVICE_CLASS(klass); 773 774 vdc->get_config = virtio_scsi_get_config; 775 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 776 } 777 778 static void virtio_scsi_class_init(ObjectClass *klass, void *data) 779 { 780 DeviceClass *dc = DEVICE_CLASS(klass); 781 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 782 783 dc->props = virtio_scsi_properties; 784 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 785 vdc->realize = virtio_scsi_device_realize; 786 vdc->unrealize = virtio_scsi_device_unrealize; 787 vdc->set_config = virtio_scsi_set_config; 788 vdc->get_features = virtio_scsi_get_features; 789 vdc->reset = virtio_scsi_reset; 790 } 791 792 static const TypeInfo virtio_scsi_common_info = { 793 .name = TYPE_VIRTIO_SCSI_COMMON, 794 .parent = TYPE_VIRTIO_DEVICE, 795 .instance_size = sizeof(VirtIOSCSICommon), 796 .abstract = true, 797 .class_init = virtio_scsi_common_class_init, 798 }; 799 800 static const TypeInfo virtio_scsi_info = { 801 .name = TYPE_VIRTIO_SCSI, 802 .parent = TYPE_VIRTIO_SCSI_COMMON, 803 .instance_size = sizeof(VirtIOSCSI), 804 .class_init = virtio_scsi_class_init, 805 }; 806 807 static void virtio_register_types(void) 808 { 809 type_register_static(&virtio_scsi_common_info); 810 type_register_static(&virtio_scsi_info); 811 } 812 813 type_init(virtio_register_types) 814