| 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 "system/block-backend.h" |
| 26 | #include "system/dma.h" |
| 27 | #include "hw/core/qdev-properties.h" |
| 28 | #include "hw/scsi/scsi.h" |
| 29 | #include "scsi/constants.h" |
| 30 | #include "hw/virtio/iothread-vq-mapping.h" |
| 31 | #include "hw/virtio/virtio-bus.h" |
| 32 | #include "hw/virtio/virtio-access.h" |
| 33 | #include "trace.h" |
| 34 | |
| 35 | typedef struct VirtIOSCSIReq { |
| 36 | /* |
| 37 | * Note: |
| 38 | * - fields up to resp_iov are initialized by virtio_scsi_init_req; |
| 39 | * - fields starting at vring are zeroed by virtio_scsi_init_req. |
| 40 | */ |
| 41 | VirtQueueElement elem; |
| 42 | |
| 43 | VirtIOSCSI *dev; |
| 44 | VirtQueue *vq; |
| 45 | QEMUSGList qsgl; |
| 46 | QEMUIOVector resp_iov; |
| 47 | |
| 48 | /* Used for two-stage request submission and TMFs deferred to BH */ |
| 49 | QTAILQ_ENTRY(VirtIOSCSIReq) next; |
| 50 | |
| 51 | /* Used for cancellation of request during TMFs. Atomic. */ |
| 52 | int remaining; |
| 53 | |
| 54 | SCSIRequest *sreq; |
| 55 | size_t resp_size; |
| 56 | enum SCSIXferMode mode; |
| 57 | union { |
| 58 | VirtIOSCSICmdResp cmd; |
| 59 | VirtIOSCSICtrlTMFResp tmf; |
| 60 | VirtIOSCSICtrlANResp an; |
| 61 | VirtIOSCSIEvent event; |
| 62 | } resp; |
| 63 | union { |
| 64 | VirtIOSCSICmdReq cmd; |
| 65 | VirtIOSCSICtrlTMFReq tmf; |
| 66 | VirtIOSCSICtrlANReq an; |
| 67 | } req; |
| 68 | } VirtIOSCSIReq; |
| 69 | |
| 70 | static inline int virtio_scsi_get_lun(uint8_t *lun) |
| 71 | { |
| 72 | return ((lun[2] << 8) | lun[3]) & 0x3FFF; |
| 73 | } |
| 74 | |
| 75 | static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun) |
| 76 | { |
| 77 | if (lun[0] != 1) { |
| 78 | return NULL; |
| 79 | } |
| 80 | if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { |
| 81 | return NULL; |
| 82 | } |
| 83 | return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); |
| 84 | } |
| 85 | |
| 86 | static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) |
| 87 | { |
| 88 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 89 | const size_t zero_skip = |
| 90 | offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov); |
| 91 | |
| 92 | req->vq = vq; |
| 93 | req->dev = s; |
| 94 | qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as); |
| 95 | qemu_iovec_init(&req->resp_iov, 1); |
| 96 | memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip); |
| 97 | } |
| 98 | |
| 99 | static void virtio_scsi_free_req(VirtIOSCSIReq *req) |
| 100 | { |
| 101 | qemu_iovec_destroy(&req->resp_iov); |
| 102 | qemu_sglist_destroy(&req->qsgl); |
| 103 | g_free(req); |
| 104 | } |
| 105 | |
| 106 | static void virtio_scsi_complete_req(VirtIOSCSIReq *req, QemuMutex *vq_lock) |
| 107 | { |
| 108 | VirtIOSCSI *s = req->dev; |
| 109 | VirtQueue *vq = req->vq; |
| 110 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 111 | |
| 112 | qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); |
| 113 | |
| 114 | if (vq_lock) { |
| 115 | qemu_mutex_lock(vq_lock); |
| 116 | } |
| 117 | |
| 118 | virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); |
| 119 | virtio_notify(vdev, vq); |
| 120 | |
| 121 | if (vq_lock) { |
| 122 | qemu_mutex_unlock(vq_lock); |
| 123 | } |
| 124 | |
| 125 | if (req->sreq) { |
| 126 | req->sreq->hba_private = NULL; |
| 127 | scsi_req_unref(req->sreq); |
| 128 | } |
| 129 | virtio_scsi_free_req(req); |
| 130 | } |
| 131 | |
| 132 | static void virtio_scsi_bad_req(VirtIOSCSIReq *req, QemuMutex *vq_lock) |
| 133 | { |
| 134 | virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers"); |
| 135 | |
| 136 | if (vq_lock) { |
| 137 | qemu_mutex_lock(vq_lock); |
| 138 | } |
| 139 | |
| 140 | virtqueue_detach_element(req->vq, &req->elem, 0); |
| 141 | |
| 142 | if (vq_lock) { |
| 143 | qemu_mutex_unlock(vq_lock); |
| 144 | } |
| 145 | |
| 146 | virtio_scsi_free_req(req); |
| 147 | } |
| 148 | |
| 149 | static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, |
| 150 | hwaddr *addr, int num, size_t skip) |
| 151 | { |
| 152 | QEMUSGList *qsgl = &req->qsgl; |
| 153 | size_t copied = 0; |
| 154 | |
| 155 | while (num) { |
| 156 | if (skip >= iov->iov_len) { |
| 157 | skip -= iov->iov_len; |
| 158 | } else { |
| 159 | qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); |
| 160 | copied += iov->iov_len - skip; |
| 161 | skip = 0; |
| 162 | } |
| 163 | iov++; |
| 164 | addr++; |
| 165 | num--; |
| 166 | } |
| 167 | |
| 168 | assert(skip == 0); |
| 169 | return copied; |
| 170 | } |
| 171 | |
| 172 | static int virtio_scsi_parse_req(VirtIOSCSIReq *req, |
| 173 | unsigned req_size, unsigned resp_size) |
| 174 | { |
| 175 | VirtIODevice *vdev = (VirtIODevice *) req->dev; |
| 176 | size_t in_size, out_size; |
| 177 | |
| 178 | if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, |
| 179 | &req->req, req_size) < req_size) { |
| 180 | return -EINVAL; |
| 181 | } |
| 182 | |
| 183 | if (qemu_iovec_concat_iov(&req->resp_iov, |
| 184 | req->elem.in_sg, req->elem.in_num, 0, |
| 185 | resp_size) < resp_size) { |
| 186 | return -EINVAL; |
| 187 | } |
| 188 | |
| 189 | req->resp_size = resp_size; |
| 190 | |
| 191 | /* Old BIOSes left some padding by mistake after the req_size/resp_size. |
| 192 | * As a workaround, always consider the first buffer as the virtio-scsi |
| 193 | * request/response, making the payload start at the second element |
| 194 | * of the iovec. |
| 195 | * |
| 196 | * The actual length of the response header, stored in req->resp_size, |
| 197 | * does not change. |
| 198 | * |
| 199 | * TODO: always disable this workaround for virtio 1.0 devices. |
| 200 | */ |
| 201 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) { |
| 202 | if (req->elem.out_num) { |
| 203 | req_size = req->elem.out_sg[0].iov_len; |
| 204 | } |
| 205 | if (req->elem.in_num) { |
| 206 | resp_size = req->elem.in_sg[0].iov_len; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | out_size = qemu_sgl_concat(req, req->elem.out_sg, |
| 211 | &req->elem.out_addr[0], req->elem.out_num, |
| 212 | req_size); |
| 213 | in_size = qemu_sgl_concat(req, req->elem.in_sg, |
| 214 | &req->elem.in_addr[0], req->elem.in_num, |
| 215 | resp_size); |
| 216 | |
| 217 | if (out_size && in_size) { |
| 218 | return -ENOTSUP; |
| 219 | } |
| 220 | |
| 221 | if (out_size) { |
| 222 | req->mode = SCSI_XFER_TO_DEV; |
| 223 | } else if (in_size) { |
| 224 | req->mode = SCSI_XFER_FROM_DEV; |
| 225 | } |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq, size_t extra_req_size, |
| 231 | QemuMutex *vq_lock) |
| 232 | { |
| 233 | VirtIOSCSIReq *req; |
| 234 | |
| 235 | if (vq_lock) { |
| 236 | qemu_mutex_lock(vq_lock); |
| 237 | } |
| 238 | |
| 239 | req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + extra_req_size); |
| 240 | |
| 241 | if (vq_lock) { |
| 242 | qemu_mutex_unlock(vq_lock); |
| 243 | } |
| 244 | |
| 245 | if (!req) { |
| 246 | return NULL; |
| 247 | } |
| 248 | virtio_scsi_init_req(s, vq, req); |
| 249 | return req; |
| 250 | } |
| 251 | |
| 252 | static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) |
| 253 | { |
| 254 | VirtIOSCSIReq *req = sreq->hba_private; |
| 255 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); |
| 256 | VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| 257 | uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED; |
| 258 | |
| 259 | assert(n < vs->conf.num_queues); |
| 260 | qemu_put_be32s(f, &n); |
| 261 | qemu_put_virtqueue_element(vdev, f, &req->elem); |
| 262 | } |
| 263 | |
| 264 | static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) |
| 265 | { |
| 266 | SCSIBus *bus = sreq->bus; |
| 267 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 268 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| 269 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 270 | VirtIOSCSIReq *req; |
| 271 | uint32_t n; |
| 272 | |
| 273 | qemu_get_be32s(f, &n); |
| 274 | assert(n < vs->conf.num_queues); |
| 275 | req = qemu_get_virtqueue_element(vdev, f, |
| 276 | sizeof(VirtIOSCSIReq) + vs->cdb_size); |
| 277 | virtio_scsi_init_req(s, vs->cmd_vqs[n], req); |
| 278 | |
| 279 | if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, |
| 280 | sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { |
| 281 | error_report("invalid SCSI request migration data"); |
| 282 | exit(1); |
| 283 | } |
| 284 | |
| 285 | scsi_req_ref(sreq); |
| 286 | req->sreq = sreq; |
| 287 | if (req->sreq->cmd.mode != SCSI_XFER_NONE) { |
| 288 | assert(req->sreq->cmd.mode == req->mode); |
| 289 | } |
| 290 | return req; |
| 291 | } |
| 292 | |
| 293 | typedef struct { |
| 294 | Notifier notifier; |
| 295 | VirtIOSCSIReq *tmf_req; |
| 296 | } VirtIOSCSICancelNotifier; |
| 297 | |
| 298 | static void virtio_scsi_tmf_dec_remaining(VirtIOSCSIReq *tmf) |
| 299 | { |
| 300 | if (qatomic_fetch_dec(&tmf->remaining) == 1) { |
| 301 | trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(tmf->req.tmf.lun), |
| 302 | tmf->req.tmf.tag, tmf->resp.tmf.response); |
| 303 | |
| 304 | virtio_scsi_complete_req(tmf, &tmf->dev->ctrl_lock); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | static void virtio_scsi_cancel_notify(Notifier *notifier, void *data) |
| 309 | { |
| 310 | VirtIOSCSICancelNotifier *n = container_of(notifier, |
| 311 | VirtIOSCSICancelNotifier, |
| 312 | notifier); |
| 313 | |
| 314 | virtio_scsi_tmf_dec_remaining(n->tmf_req); |
| 315 | g_free(n); |
| 316 | } |
| 317 | |
| 318 | static void virtio_scsi_tmf_cancel_req(VirtIOSCSIReq *tmf, SCSIRequest *r) |
| 319 | { |
| 320 | VirtIOSCSICancelNotifier *notifier; |
| 321 | |
| 322 | assert(r->ctx == qemu_get_current_aio_context()); |
| 323 | |
| 324 | /* Decremented in virtio_scsi_cancel_notify() */ |
| 325 | qatomic_inc(&tmf->remaining); |
| 326 | |
| 327 | notifier = g_new(VirtIOSCSICancelNotifier, 1); |
| 328 | notifier->notifier.notify = virtio_scsi_cancel_notify; |
| 329 | notifier->tmf_req = tmf; |
| 330 | scsi_req_cancel_async(r, ¬ifier->notifier); |
| 331 | } |
| 332 | |
| 333 | /* Execute a TMF on the requests in the current AioContext */ |
| 334 | static void virtio_scsi_do_tmf_aio_context(void *opaque) |
| 335 | { |
| 336 | AioContext *ctx = qemu_get_current_aio_context(); |
| 337 | VirtIOSCSIReq *tmf = opaque; |
| 338 | VirtIOSCSI *s = tmf->dev; |
| 339 | SCSIDevice *d = virtio_scsi_device_get(s, tmf->req.tmf.lun); |
| 340 | SCSIRequest *r; |
| 341 | bool match_tag; |
| 342 | g_autoptr(GList) reqs = NULL; |
| 343 | |
| 344 | if (!d) { |
| 345 | tmf->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; |
| 346 | virtio_scsi_tmf_dec_remaining(tmf); |
| 347 | return; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * This function could handle other subtypes that need to be processed in |
| 352 | * the request's AioContext in the future, but for now only request |
| 353 | * cancelation subtypes are performed here. |
| 354 | */ |
| 355 | switch (tmf->req.tmf.subtype) { |
| 356 | case VIRTIO_SCSI_T_TMF_ABORT_TASK: |
| 357 | match_tag = true; |
| 358 | break; |
| 359 | case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: |
| 360 | case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: |
| 361 | match_tag = false; |
| 362 | break; |
| 363 | default: |
| 364 | g_assert_not_reached(); |
| 365 | } |
| 366 | |
| 367 | WITH_QEMU_LOCK_GUARD(&d->requests_lock) { |
| 368 | QTAILQ_FOREACH(r, &d->requests, next) { |
| 369 | VirtIOSCSIReq *cmd_req = r->hba_private; |
| 370 | assert(cmd_req); /* request has hba_private while enqueued */ |
| 371 | |
| 372 | if (r->ctx != ctx) { |
| 373 | continue; |
| 374 | } |
| 375 | if (match_tag && cmd_req->req.cmd.tag != tmf->req.tmf.tag) { |
| 376 | continue; |
| 377 | } |
| 378 | /* |
| 379 | * Cannot cancel directly, because scsi_req_dequeue() would deadlock |
| 380 | * when attempting to acquire the request_lock a second time. Taking |
| 381 | * a reference here is paired with an unref after cancelling below. |
| 382 | */ |
| 383 | scsi_req_ref(r); |
| 384 | reqs = g_list_prepend(reqs, r); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | for (GList *elem = g_list_first(reqs); elem; elem = g_list_next(elem)) { |
| 389 | virtio_scsi_tmf_cancel_req(tmf, elem->data); |
| 390 | scsi_req_unref(elem->data); |
| 391 | } |
| 392 | |
| 393 | /* Incremented by virtio_scsi_do_tmf() */ |
| 394 | virtio_scsi_tmf_dec_remaining(tmf); |
| 395 | |
| 396 | object_unref(d); |
| 397 | } |
| 398 | |
| 399 | static void dummy_bh(void *opaque) |
| 400 | { |
| 401 | /* Do nothing */ |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * Wait for pending virtio_scsi_defer_tmf_to_aio_context() BHs. |
| 406 | */ |
| 407 | static void virtio_scsi_flush_defer_tmf_to_aio_context(VirtIOSCSI *s) |
| 408 | { |
| 409 | GLOBAL_STATE_CODE(); |
| 410 | |
| 411 | assert(!s->dataplane_started); |
| 412 | |
| 413 | for (uint32_t i = 0; i < s->parent_obj.conf.num_queues; i++) { |
| 414 | AioContext *ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED + i]; |
| 415 | |
| 416 | /* Our BH only runs after previously scheduled BHs */ |
| 417 | aio_wait_bh_oneshot(ctx, dummy_bh, NULL); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Run the TMF in a specific AioContext, handling only requests in that |
| 423 | * AioContext. This is necessary because requests can run in different |
| 424 | * AioContext and it is only possible to cancel them from the AioContext where |
| 425 | * they are running. |
| 426 | */ |
| 427 | static void virtio_scsi_defer_tmf_to_aio_context(VirtIOSCSIReq *tmf, |
| 428 | AioContext *ctx) |
| 429 | { |
| 430 | /* Decremented in virtio_scsi_do_tmf_aio_context() */ |
| 431 | qatomic_inc(&tmf->remaining); |
| 432 | |
| 433 | /* See virtio_scsi_flush_defer_tmf_to_aio_context() cleanup during reset */ |
| 434 | aio_bh_schedule_oneshot(ctx, virtio_scsi_do_tmf_aio_context, tmf); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Returns the AioContext for a given TMF's tag field or NULL. Note that the |
| 439 | * request identified by the tag may have completed by the time you can execute |
| 440 | * a BH in the AioContext, so don't assume the request still exists in your BH. |
| 441 | */ |
| 442 | static AioContext *find_aio_context_for_tmf_tag(SCSIDevice *d, |
| 443 | VirtIOSCSIReq *tmf) |
| 444 | { |
| 445 | WITH_QEMU_LOCK_GUARD(&d->requests_lock) { |
| 446 | SCSIRequest *r; |
| 447 | SCSIRequest *next; |
| 448 | |
| 449 | QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
| 450 | VirtIOSCSIReq *cmd_req = r->hba_private; |
| 451 | |
| 452 | /* hba_private is non-NULL while the request is enqueued */ |
| 453 | assert(cmd_req); |
| 454 | |
| 455 | if (cmd_req->req.cmd.tag == tmf->req.tmf.tag) { |
| 456 | return r->ctx; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | /* Return 0 if the request is ready to be completed and return to guest; |
| 464 | * -EINPROGRESS if the request is submitted and will be completed later, in the |
| 465 | * case of async cancellation. */ |
| 466 | static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| 467 | { |
| 468 | SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); |
| 469 | SCSIRequest *r, *next; |
| 470 | AioContext *ctx; |
| 471 | int ret = 0; |
| 472 | |
| 473 | /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ |
| 474 | req->resp.tmf.response = VIRTIO_SCSI_S_OK; |
| 475 | |
| 476 | /* |
| 477 | * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() |
| 478 | * to avoid compiler errors. |
| 479 | */ |
| 480 | req->req.tmf.subtype = |
| 481 | virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); |
| 482 | |
| 483 | trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun), |
| 484 | req->req.tmf.tag, req->req.tmf.subtype); |
| 485 | |
| 486 | switch (req->req.tmf.subtype) { |
| 487 | case VIRTIO_SCSI_T_TMF_ABORT_TASK: { |
| 488 | if (!d) { |
| 489 | goto fail; |
| 490 | } |
| 491 | if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| 492 | goto incorrect_lun; |
| 493 | } |
| 494 | |
| 495 | ctx = find_aio_context_for_tmf_tag(d, req); |
| 496 | if (ctx) { |
| 497 | virtio_scsi_defer_tmf_to_aio_context(req, ctx); |
| 498 | ret = -EINPROGRESS; |
| 499 | } |
| 500 | break; |
| 501 | } |
| 502 | |
| 503 | case VIRTIO_SCSI_T_TMF_QUERY_TASK: |
| 504 | if (!d) { |
| 505 | goto fail; |
| 506 | } |
| 507 | if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| 508 | goto incorrect_lun; |
| 509 | } |
| 510 | |
| 511 | WITH_QEMU_LOCK_GUARD(&d->requests_lock) { |
| 512 | QTAILQ_FOREACH(r, &d->requests, next) { |
| 513 | VirtIOSCSIReq *cmd_req = r->hba_private; |
| 514 | assert(cmd_req); /* request has hba_private while enqueued */ |
| 515 | |
| 516 | if (cmd_req->req.cmd.tag == req->req.tmf.tag) { |
| 517 | /* |
| 518 | * "If the specified command is present in the task set, |
| 519 | * then return a service response set to FUNCTION |
| 520 | * SUCCEEDED". |
| 521 | */ |
| 522 | req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| 523 | } |
| 524 | } |
| 525 | } |
| 526 | break; |
| 527 | |
| 528 | case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: |
| 529 | if (!d) { |
| 530 | goto fail; |
| 531 | } |
| 532 | if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| 533 | goto incorrect_lun; |
| 534 | } |
| 535 | qatomic_inc(&s->resetting); |
| 536 | device_cold_reset(&d->qdev); |
| 537 | qatomic_dec(&s->resetting); |
| 538 | break; |
| 539 | |
| 540 | case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: { |
| 541 | BusChild *kid; |
| 542 | int target = req->req.tmf.lun[1]; |
| 543 | qatomic_inc(&s->resetting); |
| 544 | |
| 545 | rcu_read_lock(); |
| 546 | QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) { |
| 547 | SCSIDevice *d1 = SCSI_DEVICE(kid->child); |
| 548 | if (d1->channel == 0 && d1->id == target) { |
| 549 | device_cold_reset(&d1->qdev); |
| 550 | } |
| 551 | } |
| 552 | rcu_read_unlock(); |
| 553 | |
| 554 | qatomic_dec(&s->resetting); |
| 555 | break; |
| 556 | } |
| 557 | |
| 558 | case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: |
| 559 | case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: { |
| 560 | g_autoptr(GHashTable) aio_contexts = g_hash_table_new(NULL, NULL); |
| 561 | |
| 562 | if (!d) { |
| 563 | goto fail; |
| 564 | } |
| 565 | if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| 566 | goto incorrect_lun; |
| 567 | } |
| 568 | |
| 569 | qatomic_inc(&req->remaining); |
| 570 | |
| 571 | for (uint32_t i = 0; i < s->parent_obj.conf.num_queues; i++) { |
| 572 | ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED + i]; |
| 573 | |
| 574 | if (!g_hash_table_add(aio_contexts, ctx)) { |
| 575 | continue; /* skip previously added AioContext */ |
| 576 | } |
| 577 | |
| 578 | virtio_scsi_defer_tmf_to_aio_context(req, ctx); |
| 579 | } |
| 580 | |
| 581 | virtio_scsi_tmf_dec_remaining(req); |
| 582 | ret = -EINPROGRESS; |
| 583 | break; |
| 584 | } |
| 585 | |
| 586 | case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: |
| 587 | if (!d) { |
| 588 | goto fail; |
| 589 | } |
| 590 | if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| 591 | goto incorrect_lun; |
| 592 | } |
| 593 | |
| 594 | WITH_QEMU_LOCK_GUARD(&d->requests_lock) { |
| 595 | QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
| 596 | /* Request has hba_private while enqueued */ |
| 597 | assert(r->hba_private); |
| 598 | |
| 599 | /* |
| 600 | * "If there is any command present in the task set, then |
| 601 | * return a service response set to FUNCTION SUCCEEDED". |
| 602 | */ |
| 603 | req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| 604 | break; |
| 605 | } |
| 606 | } |
| 607 | break; |
| 608 | |
| 609 | case VIRTIO_SCSI_T_TMF_CLEAR_ACA: |
| 610 | default: |
| 611 | req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
| 612 | break; |
| 613 | } |
| 614 | |
| 615 | object_unref(OBJECT(d)); |
| 616 | return ret; |
| 617 | |
| 618 | incorrect_lun: |
| 619 | req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; |
| 620 | object_unref(OBJECT(d)); |
| 621 | return ret; |
| 622 | |
| 623 | fail: |
| 624 | req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; |
| 625 | object_unref(OBJECT(d)); |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| 630 | { |
| 631 | VirtIODevice *vdev = (VirtIODevice *)s; |
| 632 | uint32_t type; |
| 633 | int r = 0; |
| 634 | |
| 635 | if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, |
| 636 | &type, sizeof(type)) < sizeof(type)) { |
| 637 | virtio_scsi_bad_req(req, &s->ctrl_lock); |
| 638 | return; |
| 639 | } |
| 640 | |
| 641 | virtio_tswap32s(vdev, &type); |
| 642 | if (type == VIRTIO_SCSI_T_TMF) { |
| 643 | if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), |
| 644 | sizeof(VirtIOSCSICtrlTMFResp)) < 0) { |
| 645 | virtio_scsi_bad_req(req, &s->ctrl_lock); |
| 646 | return; |
| 647 | } else { |
| 648 | r = virtio_scsi_do_tmf(s, req); |
| 649 | } |
| 650 | |
| 651 | } else if (type == VIRTIO_SCSI_T_AN_QUERY || |
| 652 | type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { |
| 653 | if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), |
| 654 | sizeof(VirtIOSCSICtrlANResp)) < 0) { |
| 655 | virtio_scsi_bad_req(req, &s->ctrl_lock); |
| 656 | return; |
| 657 | } else { |
| 658 | req->req.an.event_requested = |
| 659 | virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested); |
| 660 | trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun), |
| 661 | req->req.an.event_requested); |
| 662 | req->resp.an.event_actual = 0; |
| 663 | req->resp.an.response = VIRTIO_SCSI_S_OK; |
| 664 | } |
| 665 | } |
| 666 | if (r == 0) { |
| 667 | if (type == VIRTIO_SCSI_T_TMF) |
| 668 | trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun), |
| 669 | req->req.tmf.tag, |
| 670 | req->resp.tmf.response); |
| 671 | else if (type == VIRTIO_SCSI_T_AN_QUERY || |
| 672 | type == VIRTIO_SCSI_T_AN_SUBSCRIBE) |
| 673 | trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun), |
| 674 | req->resp.an.response); |
| 675 | virtio_scsi_complete_req(req, &s->ctrl_lock); |
| 676 | } else { |
| 677 | assert(r == -EINPROGRESS); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) |
| 682 | { |
| 683 | VirtIOSCSIReq *req; |
| 684 | |
| 685 | while ((req = virtio_scsi_pop_req(s, vq, 0, &s->ctrl_lock))) { |
| 686 | virtio_scsi_handle_ctrl_req(s, req); |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * If dataplane is configured but not yet started, do so now and return true on |
| 692 | * success. |
| 693 | * |
| 694 | * Dataplane is started by the core virtio code but virtqueue handler functions |
| 695 | * can also be invoked when a guest kicks before DRIVER_OK, so this helper |
| 696 | * function helps us deal with manually starting ioeventfd in that case. |
| 697 | */ |
| 698 | static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s) |
| 699 | { |
| 700 | if (s->dataplane_started) { |
| 701 | return false; |
| 702 | } |
| 703 | if (s->vq_aio_context[0] == qemu_get_aio_context()) { |
| 704 | return false; /* not using IOThreads */ |
| 705 | } |
| 706 | |
| 707 | virtio_device_start_ioeventfd(&s->parent_obj.parent_obj); |
| 708 | return !s->dataplane_fenced; |
| 709 | } |
| 710 | |
| 711 | static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
| 712 | { |
| 713 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 714 | |
| 715 | if (virtio_scsi_defer_to_dataplane(s)) { |
| 716 | return; |
| 717 | } |
| 718 | |
| 719 | virtio_scsi_handle_ctrl_vq(s, vq); |
| 720 | } |
| 721 | |
| 722 | static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) |
| 723 | { |
| 724 | trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun), |
| 725 | req->req.cmd.tag, |
| 726 | req->resp.cmd.response, |
| 727 | req->resp.cmd.status); |
| 728 | /* Sense data is not in req->resp and is copied separately |
| 729 | * in virtio_scsi_command_complete. |
| 730 | */ |
| 731 | req->resp_size = sizeof(VirtIOSCSICmdResp); |
| 732 | virtio_scsi_complete_req(req, NULL); |
| 733 | } |
| 734 | |
| 735 | static void virtio_scsi_command_failed(SCSIRequest *r) |
| 736 | { |
| 737 | VirtIOSCSIReq *req = r->hba_private; |
| 738 | |
| 739 | if (r->io_canceled) { |
| 740 | return; |
| 741 | } |
| 742 | |
| 743 | req->resp.cmd.status = GOOD; |
| 744 | switch (r->host_status) { |
| 745 | case SCSI_HOST_NO_LUN: |
| 746 | req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN; |
| 747 | break; |
| 748 | case SCSI_HOST_BUSY: |
| 749 | req->resp.cmd.response = VIRTIO_SCSI_S_BUSY; |
| 750 | break; |
| 751 | case SCSI_HOST_TIME_OUT: |
| 752 | case SCSI_HOST_ABORTED: |
| 753 | req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; |
| 754 | break; |
| 755 | case SCSI_HOST_BAD_RESPONSE: |
| 756 | req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; |
| 757 | break; |
| 758 | case SCSI_HOST_RESET: |
| 759 | req->resp.cmd.response = VIRTIO_SCSI_S_RESET; |
| 760 | break; |
| 761 | case SCSI_HOST_TRANSPORT_DISRUPTED: |
| 762 | req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE; |
| 763 | break; |
| 764 | case SCSI_HOST_TARGET_FAILURE: |
| 765 | req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE; |
| 766 | break; |
| 767 | case SCSI_HOST_RESERVATION_ERROR: |
| 768 | req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE; |
| 769 | break; |
| 770 | case SCSI_HOST_ALLOCATION_FAILURE: |
| 771 | case SCSI_HOST_MEDIUM_ERROR: |
| 772 | case SCSI_HOST_ERROR: |
| 773 | default: |
| 774 | req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; |
| 775 | break; |
| 776 | } |
| 777 | virtio_scsi_complete_cmd_req(req); |
| 778 | } |
| 779 | |
| 780 | static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid) |
| 781 | { |
| 782 | VirtIOSCSIReq *req = r->hba_private; |
| 783 | uint8_t sense[SCSI_SENSE_BUF_SIZE]; |
| 784 | uint32_t sense_len; |
| 785 | VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| 786 | |
| 787 | if (r->io_canceled) { |
| 788 | return; |
| 789 | } |
| 790 | |
| 791 | req->resp.cmd.response = VIRTIO_SCSI_S_OK; |
| 792 | req->resp.cmd.status = r->status; |
| 793 | if (req->resp.cmd.status == GOOD) { |
| 794 | req->resp.cmd.resid = virtio_tswap32(vdev, resid); |
| 795 | } else { |
| 796 | req->resp.cmd.resid = 0; |
| 797 | sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); |
| 798 | sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); |
| 799 | qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), |
| 800 | sense, sense_len); |
| 801 | req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); |
| 802 | } |
| 803 | virtio_scsi_complete_cmd_req(req); |
| 804 | } |
| 805 | |
| 806 | static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, |
| 807 | uint8_t *buf, size_t buf_len, |
| 808 | void *hba_private) |
| 809 | { |
| 810 | VirtIOSCSIReq *req = hba_private; |
| 811 | |
| 812 | if (cmd->len == 0) { |
| 813 | cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); |
| 814 | memcpy(cmd->buf, buf, cmd->len); |
| 815 | } |
| 816 | |
| 817 | /* Extract the direction and mode directly from the request, for |
| 818 | * host device passthrough. |
| 819 | */ |
| 820 | cmd->xfer = req->qsgl.size; |
| 821 | cmd->mode = req->mode; |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) |
| 826 | { |
| 827 | VirtIOSCSIReq *req = r->hba_private; |
| 828 | |
| 829 | return &req->qsgl; |
| 830 | } |
| 831 | |
| 832 | static void virtio_scsi_request_cancelled(SCSIRequest *r) |
| 833 | { |
| 834 | VirtIOSCSIReq *req = r->hba_private; |
| 835 | |
| 836 | if (!req) { |
| 837 | return; |
| 838 | } |
| 839 | if (qatomic_read(&req->dev->resetting)) { |
| 840 | req->resp.cmd.response = VIRTIO_SCSI_S_RESET; |
| 841 | } else { |
| 842 | req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; |
| 843 | } |
| 844 | virtio_scsi_complete_cmd_req(req); |
| 845 | } |
| 846 | |
| 847 | static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) |
| 848 | { |
| 849 | req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; |
| 850 | virtio_scsi_complete_cmd_req(req); |
| 851 | } |
| 852 | |
| 853 | static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req, |
| 854 | size_t cdb_size) |
| 855 | { |
| 856 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| 857 | SCSIDevice *d; |
| 858 | int rc; |
| 859 | |
| 860 | rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + cdb_size, |
| 861 | sizeof(VirtIOSCSICmdResp) + vs->sense_size); |
| 862 | if (rc < 0) { |
| 863 | if (rc == -ENOTSUP) { |
| 864 | virtio_scsi_fail_cmd_req(req); |
| 865 | return -ENOTSUP; |
| 866 | } else { |
| 867 | virtio_scsi_bad_req(req, NULL); |
| 868 | return -EINVAL; |
| 869 | } |
| 870 | } |
| 871 | trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun), |
| 872 | req->req.cmd.tag, req->req.cmd.cdb[0]); |
| 873 | |
| 874 | d = virtio_scsi_device_get(s, req->req.cmd.lun); |
| 875 | if (!d) { |
| 876 | req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; |
| 877 | virtio_scsi_complete_cmd_req(req); |
| 878 | return -ENOENT; |
| 879 | } |
| 880 | req->sreq = scsi_req_new(d, req->req.cmd.tag, |
| 881 | virtio_scsi_get_lun(req->req.cmd.lun), |
| 882 | req->req.cmd.cdb, cdb_size, req); |
| 883 | |
| 884 | if (req->sreq->cmd.mode != SCSI_XFER_NONE |
| 885 | && (req->sreq->cmd.mode != req->mode || |
| 886 | req->sreq->cmd.xfer > req->qsgl.size)) { |
| 887 | req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; |
| 888 | virtio_scsi_complete_cmd_req(req); |
| 889 | object_unref(OBJECT(d)); |
| 890 | return -ENOBUFS; |
| 891 | } |
| 892 | scsi_req_ref(req->sreq); |
| 893 | defer_call_begin(); |
| 894 | object_unref(OBJECT(d)); |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| 899 | { |
| 900 | SCSIRequest *sreq = req->sreq; |
| 901 | if (scsi_req_enqueue(sreq)) { |
| 902 | scsi_req_continue(sreq); |
| 903 | } |
| 904 | defer_call_end(); |
| 905 | scsi_req_unref(sreq); |
| 906 | } |
| 907 | |
| 908 | static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) |
| 909 | { |
| 910 | VirtIOSCSIReq *req, *next; |
| 911 | int ret = 0; |
| 912 | bool suppress_notifications = virtio_queue_get_notification(vq); |
| 913 | |
| 914 | QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); |
| 915 | |
| 916 | do { |
| 917 | VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s; |
| 918 | size_t cdb_size = qatomic_read(&vs->cdb_size); |
| 919 | |
| 920 | if (suppress_notifications) { |
| 921 | virtio_queue_set_notification(vq, 0); |
| 922 | } |
| 923 | |
| 924 | while ((req = virtio_scsi_pop_req(s, vq, cdb_size, NULL))) { |
| 925 | ret = virtio_scsi_handle_cmd_req_prepare(s, req, cdb_size); |
| 926 | if (!ret) { |
| 927 | QTAILQ_INSERT_TAIL(&reqs, req, next); |
| 928 | } else if (ret == -EINVAL) { |
| 929 | /* The device is broken and shouldn't process any request */ |
| 930 | while (!QTAILQ_EMPTY(&reqs)) { |
| 931 | req = QTAILQ_FIRST(&reqs); |
| 932 | QTAILQ_REMOVE(&reqs, req, next); |
| 933 | defer_call_end(); |
| 934 | /* Drop both the ref from _prepare and the initial ref */ |
| 935 | scsi_req_unref(req->sreq); |
| 936 | scsi_req_unref_detach_hba(req->sreq); |
| 937 | virtqueue_detach_element(req->vq, &req->elem, 0); |
| 938 | virtio_scsi_free_req(req); |
| 939 | } |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | if (suppress_notifications) { |
| 944 | virtio_queue_set_notification(vq, 1); |
| 945 | } |
| 946 | } while (ret != -EINVAL && !virtio_queue_empty(vq)); |
| 947 | |
| 948 | QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { |
| 949 | virtio_scsi_handle_cmd_req_submit(s, req); |
| 950 | } |
| 951 | } |
| 952 | |
| 953 | static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) |
| 954 | { |
| 955 | /* use non-QOM casts in the data path */ |
| 956 | VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 957 | |
| 958 | if (virtio_scsi_defer_to_dataplane(s)) { |
| 959 | return; |
| 960 | } |
| 961 | |
| 962 | virtio_scsi_handle_cmd_vq(s, vq); |
| 963 | } |
| 964 | |
| 965 | static void virtio_scsi_get_config(VirtIODevice *vdev, |
| 966 | uint8_t *config) |
| 967 | { |
| 968 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| 969 | VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); |
| 970 | |
| 971 | virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); |
| 972 | virtio_stl_p(vdev, &scsiconf->seg_max, |
| 973 | s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2); |
| 974 | virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); |
| 975 | virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); |
| 976 | virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); |
| 977 | virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); |
| 978 | virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); |
| 979 | virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); |
| 980 | virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); |
| 981 | virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); |
| 982 | } |
| 983 | |
| 984 | static void virtio_scsi_set_config(VirtIODevice *vdev, |
| 985 | const uint8_t *config) |
| 986 | { |
| 987 | VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| 988 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); |
| 989 | |
| 990 | if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || |
| 991 | (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { |
| 992 | virtio_error(vdev, |
| 993 | "bad data written to virtio-scsi configuration space"); |
| 994 | return; |
| 995 | } |
| 996 | |
| 997 | vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); |
| 998 | qatomic_set(&vs->cdb_size, virtio_ldl_p(vdev, &scsiconf->cdb_size)); |
| 999 | } |
| 1000 | |
| 1001 | static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, |
| 1002 | uint64_t requested_features, |
| 1003 | Error **errp) |
| 1004 | { |
| 1005 | VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| 1006 | |
| 1007 | /* Firstly sync all virtio-scsi possible supported features */ |
| 1008 | requested_features |= s->host_features; |
| 1009 | return requested_features; |
| 1010 | } |
| 1011 | |
| 1012 | static void virtio_scsi_reset(VirtIODevice *vdev) |
| 1013 | { |
| 1014 | VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| 1015 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); |
| 1016 | |
| 1017 | assert(!s->dataplane_started); |
| 1018 | |
| 1019 | virtio_scsi_flush_defer_tmf_to_aio_context(s); |
| 1020 | |
| 1021 | qatomic_inc(&s->resetting); |
| 1022 | bus_cold_reset(BUS(&s->bus)); |
| 1023 | qatomic_dec(&s->resetting); |
| 1024 | |
| 1025 | vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; |
| 1026 | vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; |
| 1027 | |
| 1028 | WITH_QEMU_LOCK_GUARD(&s->event_lock) { |
| 1029 | s->events_dropped = false; |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | typedef struct { |
| 1034 | uint32_t event; |
| 1035 | uint32_t reason; |
| 1036 | union { |
| 1037 | /* Used by messages specific to a device */ |
| 1038 | struct { |
| 1039 | uint32_t id; |
| 1040 | uint32_t lun; |
| 1041 | } address; |
| 1042 | }; |
| 1043 | } VirtIOSCSIEventInfo; |
| 1044 | |
| 1045 | static void virtio_scsi_push_event(VirtIOSCSI *s, |
| 1046 | const VirtIOSCSIEventInfo *info) |
| 1047 | { |
| 1048 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| 1049 | VirtIOSCSIReq *req; |
| 1050 | VirtIOSCSIEvent *evt; |
| 1051 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1052 | uint32_t event = info->event; |
| 1053 | uint32_t reason = info->reason; |
| 1054 | |
| 1055 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 1056 | return; |
| 1057 | } |
| 1058 | |
| 1059 | req = virtio_scsi_pop_req(s, vs->event_vq, 0, &s->event_lock); |
| 1060 | WITH_QEMU_LOCK_GUARD(&s->event_lock) { |
| 1061 | if (!req) { |
| 1062 | s->events_dropped = true; |
| 1063 | return; |
| 1064 | } |
| 1065 | |
| 1066 | if (s->events_dropped) { |
| 1067 | event |= VIRTIO_SCSI_T_EVENTS_MISSED; |
| 1068 | s->events_dropped = false; |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { |
| 1073 | virtio_scsi_bad_req(req, &s->event_lock); |
| 1074 | return; |
| 1075 | } |
| 1076 | |
| 1077 | evt = &req->resp.event; |
| 1078 | memset(evt, 0, sizeof(VirtIOSCSIEvent)); |
| 1079 | evt->event = virtio_tswap32(vdev, event); |
| 1080 | evt->reason = virtio_tswap32(vdev, reason); |
| 1081 | if (event != VIRTIO_SCSI_T_EVENTS_MISSED) { |
| 1082 | evt->lun[0] = 1; |
| 1083 | evt->lun[1] = info->address.id; |
| 1084 | |
| 1085 | /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ |
| 1086 | if (info->address.lun >= 256) { |
| 1087 | evt->lun[2] = (info->address.lun >> 8) | 0x40; |
| 1088 | } |
| 1089 | evt->lun[3] = info->address.lun & 0xFF; |
| 1090 | } |
| 1091 | trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason); |
| 1092 | |
| 1093 | virtio_scsi_complete_req(req, &s->event_lock); |
| 1094 | } |
| 1095 | |
| 1096 | static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) |
| 1097 | { |
| 1098 | bool events_dropped; |
| 1099 | |
| 1100 | WITH_QEMU_LOCK_GUARD(&s->event_lock) { |
| 1101 | events_dropped = s->events_dropped; |
| 1102 | } |
| 1103 | |
| 1104 | if (events_dropped) { |
| 1105 | VirtIOSCSIEventInfo info = { |
| 1106 | .event = VIRTIO_SCSI_T_NO_EVENT, |
| 1107 | }; |
| 1108 | virtio_scsi_push_event(s, &info); |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) |
| 1113 | { |
| 1114 | VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| 1115 | |
| 1116 | if (virtio_scsi_defer_to_dataplane(s)) { |
| 1117 | return; |
| 1118 | } |
| 1119 | |
| 1120 | virtio_scsi_handle_event_vq(s, vq); |
| 1121 | } |
| 1122 | |
| 1123 | static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
| 1124 | { |
| 1125 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 1126 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1127 | |
| 1128 | if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && |
| 1129 | dev->type != TYPE_ROM) { |
| 1130 | VirtIOSCSIEventInfo info = { |
| 1131 | .event = VIRTIO_SCSI_T_PARAM_CHANGE, |
| 1132 | .reason = sense.asc | (sense.ascq << 8), |
| 1133 | .address = { |
| 1134 | .id = dev->id, |
| 1135 | .lun = dev->lun, |
| 1136 | }, |
| 1137 | }; |
| 1138 | |
| 1139 | virtio_scsi_push_event(s, &info); |
| 1140 | } |
| 1141 | } |
| 1142 | |
| 1143 | static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, |
| 1144 | DeviceState *dev, Error **errp) |
| 1145 | { |
| 1146 | SCSIDevice *sd = SCSI_DEVICE(dev); |
| 1147 | sd->hba_supports_iothread = true; |
| 1148 | } |
| 1149 | |
| 1150 | static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, |
| 1151 | Error **errp) |
| 1152 | { |
| 1153 | VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); |
| 1154 | VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| 1155 | AioContext *ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED]; |
| 1156 | SCSIDevice *sd = SCSI_DEVICE(dev); |
| 1157 | |
| 1158 | if (ctx != qemu_get_aio_context() && !s->dataplane_fenced) { |
| 1159 | /* |
| 1160 | * Try to make the BlockBackend's AioContext match ours. Ignore failure |
| 1161 | * because I/O will still work although block jobs and other users |
| 1162 | * might be slower when multiple AioContexts use a BlockBackend. |
| 1163 | */ |
| 1164 | blk_set_aio_context(sd->conf.blk, ctx, NULL); |
| 1165 | } |
| 1166 | |
| 1167 | if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { |
| 1168 | VirtIOSCSIEventInfo info = { |
| 1169 | .event = VIRTIO_SCSI_T_TRANSPORT_RESET, |
| 1170 | .reason = VIRTIO_SCSI_EVT_RESET_RESCAN, |
| 1171 | .address = { |
| 1172 | .id = sd->id, |
| 1173 | .lun = sd->lun, |
| 1174 | }, |
| 1175 | }; |
| 1176 | |
| 1177 | virtio_scsi_push_event(s, &info); |
| 1178 | scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, |
| 1183 | Error **errp) |
| 1184 | { |
| 1185 | VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); |
| 1186 | VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| 1187 | SCSIDevice *sd = SCSI_DEVICE(dev); |
| 1188 | VirtIOSCSIEventInfo info = { |
| 1189 | .event = VIRTIO_SCSI_T_TRANSPORT_RESET, |
| 1190 | .reason = VIRTIO_SCSI_EVT_RESET_REMOVED, |
| 1191 | .address = { |
| 1192 | .id = sd->id, |
| 1193 | .lun = sd->lun, |
| 1194 | }, |
| 1195 | }; |
| 1196 | |
| 1197 | qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); |
| 1198 | |
| 1199 | if (s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED] != qemu_get_aio_context()) { |
| 1200 | /* If other users keep the BlockBackend in the iothread, that's ok */ |
| 1201 | blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); |
| 1202 | } |
| 1203 | |
| 1204 | if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { |
| 1205 | virtio_scsi_push_event(s, &info); |
| 1206 | scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); |
| 1207 | } |
| 1208 | } |
| 1209 | |
| 1210 | /* Suspend virtqueue ioeventfd processing during drain */ |
| 1211 | static void virtio_scsi_drained_begin(SCSIBus *bus) |
| 1212 | { |
| 1213 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 1214 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1215 | uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + |
| 1216 | s->parent_obj.conf.num_queues; |
| 1217 | |
| 1218 | /* |
| 1219 | * Drain is called when stopping dataplane but the host notifier has |
| 1220 | * already been detached. Detaching multiple times is a no-op if nothing |
| 1221 | * else is using the monitoring same file descriptor, but avoid it just in |
| 1222 | * case. |
| 1223 | * |
| 1224 | * Also, don't detach if dataplane has not even been started yet because |
| 1225 | * the host notifier isn't attached. |
| 1226 | */ |
| 1227 | if (s->dataplane_stopping || !s->dataplane_started) { |
| 1228 | return; |
| 1229 | } |
| 1230 | |
| 1231 | for (uint32_t i = 0; i < total_queues; i++) { |
| 1232 | VirtQueue *vq = virtio_get_queue(vdev, i); |
| 1233 | virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]); |
| 1234 | } |
| 1235 | } |
| 1236 | |
| 1237 | /* Resume virtqueue ioeventfd processing after drain */ |
| 1238 | static void virtio_scsi_drained_end(SCSIBus *bus) |
| 1239 | { |
| 1240 | VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 1241 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| 1242 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1243 | uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED + |
| 1244 | s->parent_obj.conf.num_queues; |
| 1245 | |
| 1246 | /* |
| 1247 | * Drain is called when stopping dataplane. Keep the host notifier detached |
| 1248 | * so it's not left dangling after dataplane is stopped. |
| 1249 | * |
| 1250 | * Also, don't attach if dataplane has not even been started yet. We're not |
| 1251 | * ready. |
| 1252 | */ |
| 1253 | if (s->dataplane_stopping || !s->dataplane_started) { |
| 1254 | return; |
| 1255 | } |
| 1256 | |
| 1257 | for (uint32_t i = 0; i < total_queues; i++) { |
| 1258 | VirtQueue *vq = virtio_get_queue(vdev, i); |
| 1259 | AioContext *ctx = s->vq_aio_context[i]; |
| 1260 | |
| 1261 | if (vq == vs->event_vq) { |
| 1262 | virtio_queue_aio_attach_host_notifier_no_poll(vq, ctx); |
| 1263 | } else { |
| 1264 | virtio_queue_aio_attach_host_notifier(vq, ctx); |
| 1265 | } |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | static struct SCSIBusInfo virtio_scsi_scsi_info = { |
| 1270 | .tcq = true, |
| 1271 | .max_channel = VIRTIO_SCSI_MAX_CHANNEL, |
| 1272 | .max_target = VIRTIO_SCSI_MAX_TARGET, |
| 1273 | .max_lun = VIRTIO_SCSI_MAX_LUN, |
| 1274 | |
| 1275 | .complete = virtio_scsi_command_complete, |
| 1276 | .fail = virtio_scsi_command_failed, |
| 1277 | .cancel = virtio_scsi_request_cancelled, |
| 1278 | .change = virtio_scsi_change, |
| 1279 | .parse_cdb = virtio_scsi_parse_cdb, |
| 1280 | .get_sg_list = virtio_scsi_get_sg_list, |
| 1281 | .save_request = virtio_scsi_save_request, |
| 1282 | .load_request = virtio_scsi_load_request, |
| 1283 | .drained_begin = virtio_scsi_drained_begin, |
| 1284 | .drained_end = virtio_scsi_drained_end, |
| 1285 | }; |
| 1286 | |
| 1287 | void virtio_scsi_common_realize(DeviceState *dev, |
| 1288 | VirtIOHandleOutput ctrl, |
| 1289 | VirtIOHandleOutput evt, |
| 1290 | VirtIOHandleOutput cmd, |
| 1291 | Error **errp) |
| 1292 | { |
| 1293 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1294 | VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); |
| 1295 | int i; |
| 1296 | |
| 1297 | virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig)); |
| 1298 | |
| 1299 | if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) { |
| 1300 | s->conf.num_queues = 1; |
| 1301 | } |
| 1302 | if (s->conf.num_queues == 0 || |
| 1303 | s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) { |
| 1304 | error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " |
| 1305 | "must be a positive integer less than %d.", |
| 1306 | s->conf.num_queues, |
| 1307 | VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED); |
| 1308 | virtio_cleanup(vdev); |
| 1309 | return; |
| 1310 | } |
| 1311 | if (s->conf.virtqueue_size <= 2) { |
| 1312 | error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), " |
| 1313 | "must be > 2", s->conf.virtqueue_size); |
| 1314 | return; |
| 1315 | } |
| 1316 | s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); |
| 1317 | s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; |
| 1318 | s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; |
| 1319 | |
| 1320 | s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); |
| 1321 | s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); |
| 1322 | for (i = 0; i < s->conf.num_queues; i++) { |
| 1323 | s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) |
| 1328 | { |
| 1329 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1330 | VirtIOSCSI *s = VIRTIO_SCSI(dev); |
| 1331 | Error *err = NULL; |
| 1332 | |
| 1333 | qemu_mutex_init(&s->ctrl_lock); |
| 1334 | qemu_mutex_init(&s->event_lock); |
| 1335 | |
| 1336 | virtio_scsi_common_realize(dev, |
| 1337 | virtio_scsi_handle_ctrl, |
| 1338 | virtio_scsi_handle_event, |
| 1339 | virtio_scsi_handle_cmd, |
| 1340 | &err); |
| 1341 | if (err != NULL) { |
| 1342 | error_propagate(errp, err); |
| 1343 | return; |
| 1344 | } |
| 1345 | |
| 1346 | scsi_bus_init_named(&s->bus, sizeof(s->bus), dev, |
| 1347 | &virtio_scsi_scsi_info, vdev->bus_name); |
| 1348 | /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ |
| 1349 | qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev)); |
| 1350 | |
| 1351 | virtio_scsi_dataplane_setup(s, errp); |
| 1352 | } |
| 1353 | |
| 1354 | void virtio_scsi_common_unrealize(DeviceState *dev) |
| 1355 | { |
| 1356 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1357 | VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); |
| 1358 | int i; |
| 1359 | |
| 1360 | virtio_delete_queue(vs->ctrl_vq); |
| 1361 | virtio_delete_queue(vs->event_vq); |
| 1362 | for (i = 0; i < vs->conf.num_queues; i++) { |
| 1363 | virtio_delete_queue(vs->cmd_vqs[i]); |
| 1364 | } |
| 1365 | g_free(vs->cmd_vqs); |
| 1366 | virtio_cleanup(vdev); |
| 1367 | } |
| 1368 | |
| 1369 | /* main loop */ |
| 1370 | static void virtio_scsi_device_unrealize(DeviceState *dev) |
| 1371 | { |
| 1372 | VirtIOSCSI *s = VIRTIO_SCSI(dev); |
| 1373 | |
| 1374 | virtio_scsi_dataplane_cleanup(s); |
| 1375 | qbus_set_hotplug_handler(BUS(&s->bus), NULL); |
| 1376 | virtio_scsi_common_unrealize(dev); |
| 1377 | qemu_mutex_destroy(&s->event_lock); |
| 1378 | qemu_mutex_destroy(&s->ctrl_lock); |
| 1379 | } |
| 1380 | |
| 1381 | static const Property virtio_scsi_properties[] = { |
| 1382 | DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, |
| 1383 | VIRTIO_SCSI_AUTO_NUM_QUEUES), |
| 1384 | DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, |
| 1385 | parent_obj.conf.virtqueue_size, 256), |
| 1386 | DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI, |
| 1387 | parent_obj.conf.seg_max_adjust, true), |
| 1388 | DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, |
| 1389 | 0xFFFF), |
| 1390 | DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, |
| 1391 | 128), |
| 1392 | DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, |
| 1393 | VIRTIO_SCSI_F_HOTPLUG, true), |
| 1394 | DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, |
| 1395 | VIRTIO_SCSI_F_CHANGE, true), |
| 1396 | DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, |
| 1397 | TYPE_IOTHREAD, IOThread *), |
| 1398 | DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOSCSI, |
| 1399 | parent_obj.conf.iothread_vq_mapping_list), |
| 1400 | }; |
| 1401 | |
| 1402 | static const VMStateDescription vmstate_virtio_scsi = { |
| 1403 | .name = "virtio-scsi", |
| 1404 | .minimum_version_id = 1, |
| 1405 | .version_id = 1, |
| 1406 | .fields = (const VMStateField[]) { |
| 1407 | VMSTATE_VIRTIO_DEVICE, |
| 1408 | VMSTATE_END_OF_LIST() |
| 1409 | }, |
| 1410 | }; |
| 1411 | |
| 1412 | static void virtio_scsi_common_class_init(ObjectClass *klass, const void *data) |
| 1413 | { |
| 1414 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| 1415 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 1416 | |
| 1417 | vdc->get_config = virtio_scsi_get_config; |
| 1418 | set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| 1419 | } |
| 1420 | |
| 1421 | static void virtio_scsi_class_init(ObjectClass *klass, const void *data) |
| 1422 | { |
| 1423 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 1424 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| 1425 | HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); |
| 1426 | |
| 1427 | device_class_set_props(dc, virtio_scsi_properties); |
| 1428 | dc->vmsd = &vmstate_virtio_scsi; |
| 1429 | set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| 1430 | vdc->realize = virtio_scsi_device_realize; |
| 1431 | vdc->unrealize = virtio_scsi_device_unrealize; |
| 1432 | vdc->set_config = virtio_scsi_set_config; |
| 1433 | vdc->get_features = virtio_scsi_get_features; |
| 1434 | vdc->reset = virtio_scsi_reset; |
| 1435 | vdc->start_ioeventfd = virtio_scsi_dataplane_start; |
| 1436 | vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; |
| 1437 | hc->pre_plug = virtio_scsi_pre_hotplug; |
| 1438 | hc->plug = virtio_scsi_hotplug; |
| 1439 | hc->unplug = virtio_scsi_hotunplug; |
| 1440 | } |
| 1441 | |
| 1442 | static const TypeInfo virtio_scsi_common_info = { |
| 1443 | .name = TYPE_VIRTIO_SCSI_COMMON, |
| 1444 | .parent = TYPE_VIRTIO_DEVICE, |
| 1445 | .instance_size = sizeof(VirtIOSCSICommon), |
| 1446 | .abstract = true, |
| 1447 | .class_init = virtio_scsi_common_class_init, |
| 1448 | }; |
| 1449 | |
| 1450 | static const TypeInfo virtio_scsi_info = { |
| 1451 | .name = TYPE_VIRTIO_SCSI, |
| 1452 | .parent = TYPE_VIRTIO_SCSI_COMMON, |
| 1453 | .instance_size = sizeof(VirtIOSCSI), |
| 1454 | .class_init = virtio_scsi_class_init, |
| 1455 | .interfaces = (const InterfaceInfo[]) { |
| 1456 | { TYPE_HOTPLUG_HANDLER }, |
| 1457 | { } |
| 1458 | } |
| 1459 | }; |
| 1460 | |
| 1461 | static void virtio_register_types(void) |
| 1462 | { |
| 1463 | type_register_static(&virtio_scsi_common_info); |
| 1464 | type_register_static(&virtio_scsi_info); |
| 1465 | } |
| 1466 | |
| 1467 | type_init(virtio_register_types) |