| /* |
| * Virtio SCSI HBA |
| * |
| * Copyright IBM, Corp. 2010 |
| * Copyright Red Hat, Inc. 2011 |
| * |
| * Authors: |
| * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
| * Paolo Bonzini <pbonzini@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "standard-headers/linux/virtio_ids.h" |
| #include "hw/virtio/virtio-scsi.h" |
| #include "migration/qemu-file-types.h" |
| #include "qemu/error-report.h" |
| #include "qemu/iov.h" |
| #include "qemu/module.h" |
| #include "sysemu/block-backend.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/scsi/scsi.h" |
| #include "scsi/constants.h" |
| #include "hw/virtio/virtio-bus.h" |
| #include "hw/virtio/virtio-access.h" |
| |
| static inline int virtio_scsi_get_lun(uint8_t *lun) |
| { |
| return ((lun[2] << 8) | lun[3]) & 0x3FFF; |
| } |
| |
| static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) |
| { |
| if (lun[0] != 1) { |
| return NULL; |
| } |
| if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { |
| return NULL; |
| } |
| return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); |
| } |
| |
| void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| const size_t zero_skip = |
| offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov); |
| |
| req->vq = vq; |
| req->dev = s; |
| qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as); |
| qemu_iovec_init(&req->resp_iov, 1); |
| memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip); |
| } |
| |
| void virtio_scsi_free_req(VirtIOSCSIReq *req) |
| { |
| qemu_iovec_destroy(&req->resp_iov); |
| qemu_sglist_destroy(&req->qsgl); |
| g_free(req); |
| } |
| |
| static void virtio_scsi_complete_req(VirtIOSCSIReq *req) |
| { |
| VirtIOSCSI *s = req->dev; |
| VirtQueue *vq = req->vq; |
| VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| |
| qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size); |
| virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size); |
| if (s->dataplane_started && !s->dataplane_fenced) { |
| virtio_notify_irqfd(vdev, vq); |
| } else { |
| virtio_notify(vdev, vq); |
| } |
| |
| if (req->sreq) { |
| req->sreq->hba_private = NULL; |
| scsi_req_unref(req->sreq); |
| } |
| virtio_scsi_free_req(req); |
| } |
| |
| static void virtio_scsi_bad_req(VirtIOSCSIReq *req) |
| { |
| virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers"); |
| virtqueue_detach_element(req->vq, &req->elem, 0); |
| virtio_scsi_free_req(req); |
| } |
| |
| static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov, |
| hwaddr *addr, int num, size_t skip) |
| { |
| QEMUSGList *qsgl = &req->qsgl; |
| size_t copied = 0; |
| |
| while (num) { |
| if (skip >= iov->iov_len) { |
| skip -= iov->iov_len; |
| } else { |
| qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip); |
| copied += iov->iov_len - skip; |
| skip = 0; |
| } |
| iov++; |
| addr++; |
| num--; |
| } |
| |
| assert(skip == 0); |
| return copied; |
| } |
| |
| static int virtio_scsi_parse_req(VirtIOSCSIReq *req, |
| unsigned req_size, unsigned resp_size) |
| { |
| VirtIODevice *vdev = (VirtIODevice *) req->dev; |
| size_t in_size, out_size; |
| |
| if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, |
| &req->req, req_size) < req_size) { |
| return -EINVAL; |
| } |
| |
| if (qemu_iovec_concat_iov(&req->resp_iov, |
| req->elem.in_sg, req->elem.in_num, 0, |
| resp_size) < resp_size) { |
| return -EINVAL; |
| } |
| |
| req->resp_size = resp_size; |
| |
| /* Old BIOSes left some padding by mistake after the req_size/resp_size. |
| * As a workaround, always consider the first buffer as the virtio-scsi |
| * request/response, making the payload start at the second element |
| * of the iovec. |
| * |
| * The actual length of the response header, stored in req->resp_size, |
| * does not change. |
| * |
| * TODO: always disable this workaround for virtio 1.0 devices. |
| */ |
| if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) { |
| if (req->elem.out_num) { |
| req_size = req->elem.out_sg[0].iov_len; |
| } |
| if (req->elem.in_num) { |
| resp_size = req->elem.in_sg[0].iov_len; |
| } |
| } |
| |
| out_size = qemu_sgl_concat(req, req->elem.out_sg, |
| &req->elem.out_addr[0], req->elem.out_num, |
| req_size); |
| in_size = qemu_sgl_concat(req, req->elem.in_sg, |
| &req->elem.in_addr[0], req->elem.in_num, |
| resp_size); |
| |
| if (out_size && in_size) { |
| return -ENOTSUP; |
| } |
| |
| if (out_size) { |
| req->mode = SCSI_XFER_TO_DEV; |
| } else if (in_size) { |
| req->mode = SCSI_XFER_FROM_DEV; |
| } |
| |
| return 0; |
| } |
| |
| static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq) |
| { |
| VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s; |
| VirtIOSCSIReq *req; |
| |
| req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size); |
| if (!req) { |
| return NULL; |
| } |
| virtio_scsi_init_req(s, vq, req); |
| return req; |
| } |
| |
| static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) |
| { |
| VirtIOSCSIReq *req = sreq->hba_private; |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev); |
| VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| uint32_t n = virtio_get_queue_index(req->vq) - 2; |
| |
| assert(n < vs->conf.num_queues); |
| qemu_put_be32s(f, &n); |
| qemu_put_virtqueue_element(vdev, f, &req->elem); |
| } |
| |
| static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) |
| { |
| SCSIBus *bus = sreq->bus; |
| VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| VirtIOSCSIReq *req; |
| uint32_t n; |
| |
| qemu_get_be32s(f, &n); |
| assert(n < vs->conf.num_queues); |
| req = qemu_get_virtqueue_element(vdev, f, |
| sizeof(VirtIOSCSIReq) + vs->cdb_size); |
| virtio_scsi_init_req(s, vs->cmd_vqs[n], req); |
| |
| if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, |
| sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) { |
| error_report("invalid SCSI request migration data"); |
| exit(1); |
| } |
| |
| scsi_req_ref(sreq); |
| req->sreq = sreq; |
| if (req->sreq->cmd.mode != SCSI_XFER_NONE) { |
| assert(req->sreq->cmd.mode == req->mode); |
| } |
| return req; |
| } |
| |
| typedef struct { |
| Notifier notifier; |
| VirtIOSCSIReq *tmf_req; |
| } VirtIOSCSICancelNotifier; |
| |
| static void virtio_scsi_cancel_notify(Notifier *notifier, void *data) |
| { |
| VirtIOSCSICancelNotifier *n = container_of(notifier, |
| VirtIOSCSICancelNotifier, |
| notifier); |
| |
| if (--n->tmf_req->remaining == 0) { |
| virtio_scsi_complete_req(n->tmf_req); |
| } |
| g_free(n); |
| } |
| |
| static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d) |
| { |
| if (s->dataplane_started && d && blk_is_available(d->conf.blk)) { |
| assert(blk_get_aio_context(d->conf.blk) == s->ctx); |
| } |
| } |
| |
| /* Return 0 if the request is ready to be completed and return to guest; |
| * -EINPROGRESS if the request is submitted and will be completed later, in the |
| * case of async cancellation. */ |
| static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| { |
| SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf.lun); |
| SCSIRequest *r, *next; |
| BusChild *kid; |
| int target; |
| int ret = 0; |
| |
| virtio_scsi_ctx_check(s, d); |
| /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ |
| req->resp.tmf.response = VIRTIO_SCSI_S_OK; |
| |
| /* |
| * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s() |
| * to avoid compiler errors. |
| */ |
| req->req.tmf.subtype = |
| virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype); |
| |
| switch (req->req.tmf.subtype) { |
| case VIRTIO_SCSI_T_TMF_ABORT_TASK: |
| case VIRTIO_SCSI_T_TMF_QUERY_TASK: |
| if (!d) { |
| goto fail; |
| } |
| if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| goto incorrect_lun; |
| } |
| QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
| VirtIOSCSIReq *cmd_req = r->hba_private; |
| if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) { |
| break; |
| } |
| } |
| if (r) { |
| /* |
| * Assert that the request has not been completed yet, we |
| * check for it in the loop above. |
| */ |
| assert(r->hba_private); |
| if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) { |
| /* "If the specified command is present in the task set, then |
| * return a service response set to FUNCTION SUCCEEDED". |
| */ |
| req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| } else { |
| VirtIOSCSICancelNotifier *notifier; |
| |
| req->remaining = 1; |
| notifier = g_new(VirtIOSCSICancelNotifier, 1); |
| notifier->tmf_req = req; |
| notifier->notifier.notify = virtio_scsi_cancel_notify; |
| scsi_req_cancel_async(r, ¬ifier->notifier); |
| ret = -EINPROGRESS; |
| } |
| } |
| break; |
| |
| case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET: |
| if (!d) { |
| goto fail; |
| } |
| if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| goto incorrect_lun; |
| } |
| s->resetting++; |
| qdev_reset_all(&d->qdev); |
| s->resetting--; |
| break; |
| |
| case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET: |
| case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: |
| case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET: |
| if (!d) { |
| goto fail; |
| } |
| if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) { |
| goto incorrect_lun; |
| } |
| |
| /* Add 1 to "remaining" until virtio_scsi_do_tmf returns. |
| * This way, if the bus starts calling back to the notifiers |
| * even before we finish the loop, virtio_scsi_cancel_notify |
| * will not complete the TMF too early. |
| */ |
| req->remaining = 1; |
| QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
| if (r->hba_private) { |
| if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) { |
| /* "If there is any command present in the task set, then |
| * return a service response set to FUNCTION SUCCEEDED". |
| */ |
| req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| break; |
| } else { |
| VirtIOSCSICancelNotifier *notifier; |
| |
| req->remaining++; |
| notifier = g_new(VirtIOSCSICancelNotifier, 1); |
| notifier->notifier.notify = virtio_scsi_cancel_notify; |
| notifier->tmf_req = req; |
| scsi_req_cancel_async(r, ¬ifier->notifier); |
| } |
| } |
| } |
| if (--req->remaining > 0) { |
| ret = -EINPROGRESS; |
| } |
| break; |
| |
| case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: |
| target = req->req.tmf.lun[1]; |
| s->resetting++; |
| QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { |
| d = SCSI_DEVICE(kid->child); |
| if (d->channel == 0 && d->id == target) { |
| qdev_reset_all(&d->qdev); |
| } |
| } |
| s->resetting--; |
| break; |
| |
| case VIRTIO_SCSI_T_TMF_CLEAR_ACA: |
| default: |
| req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
| break; |
| } |
| |
| return ret; |
| |
| incorrect_lun: |
| req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; |
| return ret; |
| |
| fail: |
| req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; |
| return ret; |
| } |
| |
| static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| { |
| VirtIODevice *vdev = (VirtIODevice *)s; |
| uint32_t type; |
| int r = 0; |
| |
| if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0, |
| &type, sizeof(type)) < sizeof(type)) { |
| virtio_scsi_bad_req(req); |
| return; |
| } |
| |
| virtio_tswap32s(vdev, &type); |
| if (type == VIRTIO_SCSI_T_TMF) { |
| if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq), |
| sizeof(VirtIOSCSICtrlTMFResp)) < 0) { |
| virtio_scsi_bad_req(req); |
| return; |
| } else { |
| r = virtio_scsi_do_tmf(s, req); |
| } |
| |
| } else if (type == VIRTIO_SCSI_T_AN_QUERY || |
| type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { |
| if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq), |
| sizeof(VirtIOSCSICtrlANResp)) < 0) { |
| virtio_scsi_bad_req(req); |
| return; |
| } else { |
| req->resp.an.event_actual = 0; |
| req->resp.an.response = VIRTIO_SCSI_S_OK; |
| } |
| } |
| if (r == 0) { |
| virtio_scsi_complete_req(req); |
| } else { |
| assert(r == -EINPROGRESS); |
| } |
| } |
| |
| bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) |
| { |
| VirtIOSCSIReq *req; |
| bool progress = false; |
| |
| while ((req = virtio_scsi_pop_req(s, vq))) { |
| progress = true; |
| virtio_scsi_handle_ctrl_req(s, req); |
| } |
| return progress; |
| } |
| |
| static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| |
| if (s->ctx) { |
| virtio_device_start_ioeventfd(vdev); |
| if (!s->dataplane_fenced) { |
| return; |
| } |
| } |
| virtio_scsi_acquire(s); |
| virtio_scsi_handle_ctrl_vq(s, vq); |
| virtio_scsi_release(s); |
| } |
| |
| static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) |
| { |
| /* Sense data is not in req->resp and is copied separately |
| * in virtio_scsi_command_complete. |
| */ |
| req->resp_size = sizeof(VirtIOSCSICmdResp); |
| virtio_scsi_complete_req(req); |
| } |
| |
| static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, |
| size_t resid) |
| { |
| VirtIOSCSIReq *req = r->hba_private; |
| uint8_t sense[SCSI_SENSE_BUF_SIZE]; |
| uint32_t sense_len; |
| VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| |
| if (r->io_canceled) { |
| return; |
| } |
| |
| req->resp.cmd.response = VIRTIO_SCSI_S_OK; |
| req->resp.cmd.status = status; |
| if (req->resp.cmd.status == GOOD) { |
| req->resp.cmd.resid = virtio_tswap32(vdev, resid); |
| } else { |
| req->resp.cmd.resid = 0; |
| sense_len = scsi_req_get_sense(r, sense, sizeof(sense)); |
| sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd)); |
| qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd), |
| sense, sense_len); |
| req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len); |
| } |
| virtio_scsi_complete_cmd_req(req); |
| } |
| |
| static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, |
| uint8_t *buf, void *hba_private) |
| { |
| VirtIOSCSIReq *req = hba_private; |
| |
| if (cmd->len == 0) { |
| cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE); |
| memcpy(cmd->buf, buf, cmd->len); |
| } |
| |
| /* Extract the direction and mode directly from the request, for |
| * host device passthrough. |
| */ |
| cmd->xfer = req->qsgl.size; |
| cmd->mode = req->mode; |
| return 0; |
| } |
| |
| static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r) |
| { |
| VirtIOSCSIReq *req = r->hba_private; |
| |
| return &req->qsgl; |
| } |
| |
| static void virtio_scsi_request_cancelled(SCSIRequest *r) |
| { |
| VirtIOSCSIReq *req = r->hba_private; |
| |
| if (!req) { |
| return; |
| } |
| if (req->dev->resetting) { |
| req->resp.cmd.response = VIRTIO_SCSI_S_RESET; |
| } else { |
| req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED; |
| } |
| virtio_scsi_complete_cmd_req(req); |
| } |
| |
| static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) |
| { |
| req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE; |
| virtio_scsi_complete_cmd_req(req); |
| } |
| |
| static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| { |
| VirtIOSCSICommon *vs = &s->parent_obj; |
| SCSIDevice *d; |
| int rc; |
| |
| rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size, |
| sizeof(VirtIOSCSICmdResp) + vs->sense_size); |
| if (rc < 0) { |
| if (rc == -ENOTSUP) { |
| virtio_scsi_fail_cmd_req(req); |
| return -ENOTSUP; |
| } else { |
| virtio_scsi_bad_req(req); |
| return -EINVAL; |
| } |
| } |
| |
| d = virtio_scsi_device_find(s, req->req.cmd.lun); |
| if (!d) { |
| req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; |
| virtio_scsi_complete_cmd_req(req); |
| return -ENOENT; |
| } |
| virtio_scsi_ctx_check(s, d); |
| req->sreq = scsi_req_new(d, req->req.cmd.tag, |
| virtio_scsi_get_lun(req->req.cmd.lun), |
| req->req.cmd.cdb, req); |
| |
| if (req->sreq->cmd.mode != SCSI_XFER_NONE |
| && (req->sreq->cmd.mode != req->mode || |
| req->sreq->cmd.xfer > req->qsgl.size)) { |
| req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; |
| virtio_scsi_complete_cmd_req(req); |
| return -ENOBUFS; |
| } |
| scsi_req_ref(req->sreq); |
| blk_io_plug(d->conf.blk); |
| return 0; |
| } |
| |
| static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| { |
| SCSIRequest *sreq = req->sreq; |
| if (scsi_req_enqueue(sreq)) { |
| scsi_req_continue(sreq); |
| } |
| blk_io_unplug(sreq->dev->conf.blk); |
| scsi_req_unref(sreq); |
| } |
| |
| bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) |
| { |
| VirtIOSCSIReq *req, *next; |
| int ret = 0; |
| bool suppress_notifications = virtio_queue_get_notification(vq); |
| bool progress = false; |
| |
| QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); |
| |
| do { |
| if (suppress_notifications) { |
| virtio_queue_set_notification(vq, 0); |
| } |
| |
| while ((req = virtio_scsi_pop_req(s, vq))) { |
| progress = true; |
| ret = virtio_scsi_handle_cmd_req_prepare(s, req); |
| if (!ret) { |
| QTAILQ_INSERT_TAIL(&reqs, req, next); |
| } else if (ret == -EINVAL) { |
| /* The device is broken and shouldn't process any request */ |
| while (!QTAILQ_EMPTY(&reqs)) { |
| req = QTAILQ_FIRST(&reqs); |
| QTAILQ_REMOVE(&reqs, req, next); |
| blk_io_unplug(req->sreq->dev->conf.blk); |
| scsi_req_unref(req->sreq); |
| virtqueue_detach_element(req->vq, &req->elem, 0); |
| virtio_scsi_free_req(req); |
| } |
| } |
| } |
| |
| if (suppress_notifications) { |
| virtio_queue_set_notification(vq, 1); |
| } |
| } while (ret != -EINVAL && !virtio_queue_empty(vq)); |
| |
| QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { |
| virtio_scsi_handle_cmd_req_submit(s, req); |
| } |
| return progress; |
| } |
| |
| static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| /* use non-QOM casts in the data path */ |
| VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| |
| if (s->ctx) { |
| virtio_device_start_ioeventfd(vdev); |
| if (!s->dataplane_fenced) { |
| return; |
| } |
| } |
| virtio_scsi_acquire(s); |
| virtio_scsi_handle_cmd_vq(s, vq); |
| virtio_scsi_release(s); |
| } |
| |
| static void virtio_scsi_get_config(VirtIODevice *vdev, |
| uint8_t *config) |
| { |
| VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev); |
| |
| virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues); |
| virtio_stl_p(vdev, &scsiconf->seg_max, |
| s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2); |
| virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors); |
| virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun); |
| virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent)); |
| virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size); |
| virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size); |
| virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); |
| virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); |
| virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); |
| } |
| |
| static void virtio_scsi_set_config(VirtIODevice *vdev, |
| const uint8_t *config) |
| { |
| VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); |
| |
| if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 || |
| (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) { |
| virtio_error(vdev, |
| "bad data written to virtio-scsi configuration space"); |
| return; |
| } |
| |
| vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size); |
| vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size); |
| } |
| |
| static uint64_t virtio_scsi_get_features(VirtIODevice *vdev, |
| uint64_t requested_features, |
| Error **errp) |
| { |
| VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| |
| /* Firstly sync all virtio-scsi possible supported features */ |
| requested_features |= s->host_features; |
| return requested_features; |
| } |
| |
| static void virtio_scsi_reset(VirtIODevice *vdev) |
| { |
| VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); |
| |
| assert(!s->dataplane_started); |
| s->resetting++; |
| qbus_reset_all(BUS(&s->bus)); |
| s->resetting--; |
| |
| vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; |
| vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; |
| s->events_dropped = false; |
| } |
| |
| void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, |
| uint32_t event, uint32_t reason) |
| { |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| VirtIOSCSIReq *req; |
| VirtIOSCSIEvent *evt; |
| VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| |
| if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| return; |
| } |
| |
| req = virtio_scsi_pop_req(s, vs->event_vq); |
| if (!req) { |
| s->events_dropped = true; |
| return; |
| } |
| |
| if (s->events_dropped) { |
| event |= VIRTIO_SCSI_T_EVENTS_MISSED; |
| s->events_dropped = false; |
| } |
| |
| if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) { |
| virtio_scsi_bad_req(req); |
| return; |
| } |
| |
| evt = &req->resp.event; |
| memset(evt, 0, sizeof(VirtIOSCSIEvent)); |
| evt->event = virtio_tswap32(vdev, event); |
| evt->reason = virtio_tswap32(vdev, reason); |
| if (!dev) { |
| assert(event == VIRTIO_SCSI_T_EVENTS_MISSED); |
| } else { |
| evt->lun[0] = 1; |
| evt->lun[1] = dev->id; |
| |
| /* Linux wants us to keep the same encoding we use for REPORT LUNS. */ |
| if (dev->lun >= 256) { |
| evt->lun[2] = (dev->lun >> 8) | 0x40; |
| } |
| evt->lun[3] = dev->lun & 0xFF; |
| } |
| virtio_scsi_complete_req(req); |
| } |
| |
| bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq) |
| { |
| if (s->events_dropped) { |
| virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
| return true; |
| } |
| return false; |
| } |
| |
| static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| |
| if (s->ctx) { |
| virtio_device_start_ioeventfd(vdev); |
| if (!s->dataplane_fenced) { |
| return; |
| } |
| } |
| virtio_scsi_acquire(s); |
| virtio_scsi_handle_event_vq(s, vq); |
| virtio_scsi_release(s); |
| } |
| |
| static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
| { |
| VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| |
| if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) && |
| dev->type != TYPE_ROM) { |
| virtio_scsi_acquire(s); |
| virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, |
| sense.asc | (sense.ascq << 8)); |
| virtio_scsi_release(s); |
| } |
| } |
| |
| static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev, |
| DeviceState *dev, Error **errp) |
| { |
| SCSIDevice *sd = SCSI_DEVICE(dev); |
| sd->hba_supports_iothread = true; |
| } |
| |
| static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); |
| VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| SCSIDevice *sd = SCSI_DEVICE(dev); |
| int ret; |
| |
| if (s->ctx && !s->dataplane_fenced) { |
| if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { |
| return; |
| } |
| virtio_scsi_acquire(s); |
| ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); |
| virtio_scsi_release(s); |
| if (ret < 0) { |
| return; |
| } |
| } |
| |
| if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { |
| virtio_scsi_acquire(s); |
| virtio_scsi_push_event(s, sd, |
| VIRTIO_SCSI_T_TRANSPORT_RESET, |
| VIRTIO_SCSI_EVT_RESET_RESCAN); |
| virtio_scsi_release(s); |
| } |
| } |
| |
| static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); |
| VirtIOSCSI *s = VIRTIO_SCSI(vdev); |
| SCSIDevice *sd = SCSI_DEVICE(dev); |
| AioContext *ctx = s->ctx ?: qemu_get_aio_context(); |
| |
| if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { |
| virtio_scsi_acquire(s); |
| virtio_scsi_push_event(s, sd, |
| VIRTIO_SCSI_T_TRANSPORT_RESET, |
| VIRTIO_SCSI_EVT_RESET_REMOVED); |
| virtio_scsi_release(s); |
| } |
| |
| aio_disable_external(ctx); |
| qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); |
| aio_enable_external(ctx); |
| |
| if (s->ctx) { |
| virtio_scsi_acquire(s); |
| /* If other users keep the BlockBackend in the iothread, that's ok */ |
| blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); |
| virtio_scsi_release(s); |
| } |
| } |
| |
| static struct SCSIBusInfo virtio_scsi_scsi_info = { |
| .tcq = true, |
| .max_channel = VIRTIO_SCSI_MAX_CHANNEL, |
| .max_target = VIRTIO_SCSI_MAX_TARGET, |
| .max_lun = VIRTIO_SCSI_MAX_LUN, |
| |
| .complete = virtio_scsi_command_complete, |
| .cancel = virtio_scsi_request_cancelled, |
| .change = virtio_scsi_change, |
| .parse_cdb = virtio_scsi_parse_cdb, |
| .get_sg_list = virtio_scsi_get_sg_list, |
| .save_request = virtio_scsi_save_request, |
| .load_request = virtio_scsi_load_request, |
| }; |
| |
| void virtio_scsi_common_realize(DeviceState *dev, |
| VirtIOHandleOutput ctrl, |
| VirtIOHandleOutput evt, |
| VirtIOHandleOutput cmd, |
| Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev); |
| int i; |
| |
| virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI, |
| sizeof(VirtIOSCSIConfig)); |
| |
| if (s->conf.num_queues == 0 || |
| s->conf.num_queues > VIRTIO_QUEUE_MAX - 2) { |
| error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " |
| "must be a positive integer less than %d.", |
| s->conf.num_queues, VIRTIO_QUEUE_MAX - 2); |
| virtio_cleanup(vdev); |
| return; |
| } |
| if (s->conf.virtqueue_size <= 2) { |
| error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), " |
| "must be > 2", s->conf.virtqueue_size); |
| return; |
| } |
| s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues); |
| s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; |
| s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; |
| |
| s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl); |
| s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt); |
| for (i = 0; i < s->conf.num_queues; i++) { |
| s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd); |
| } |
| } |
| |
| static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VirtIOSCSI *s = VIRTIO_SCSI(dev); |
| Error *err = NULL; |
| |
| virtio_scsi_common_realize(dev, |
| virtio_scsi_handle_ctrl, |
| virtio_scsi_handle_event, |
| virtio_scsi_handle_cmd, |
| &err); |
| if (err != NULL) { |
| error_propagate(errp, err); |
| return; |
| } |
| |
| scsi_bus_new(&s->bus, sizeof(s->bus), dev, |
| &virtio_scsi_scsi_info, vdev->bus_name); |
| /* override default SCSI bus hotplug-handler, with virtio-scsi's one */ |
| qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev), &error_abort); |
| |
| virtio_scsi_dataplane_setup(s, errp); |
| } |
| |
| void virtio_scsi_common_unrealize(DeviceState *dev) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); |
| int i; |
| |
| virtio_delete_queue(vs->ctrl_vq); |
| virtio_delete_queue(vs->event_vq); |
| for (i = 0; i < vs->conf.num_queues; i++) { |
| virtio_delete_queue(vs->cmd_vqs[i]); |
| } |
| g_free(vs->cmd_vqs); |
| virtio_cleanup(vdev); |
| } |
| |
| static void virtio_scsi_device_unrealize(DeviceState *dev) |
| { |
| VirtIOSCSI *s = VIRTIO_SCSI(dev); |
| |
| qbus_set_hotplug_handler(BUS(&s->bus), NULL, &error_abort); |
| virtio_scsi_common_unrealize(dev); |
| } |
| |
| static Property virtio_scsi_properties[] = { |
| DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1), |
| DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI, |
| parent_obj.conf.virtqueue_size, 256), |
| DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI, |
| parent_obj.conf.seg_max_adjust, true), |
| DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors, |
| 0xFFFF), |
| DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun, |
| 128), |
| DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features, |
| VIRTIO_SCSI_F_HOTPLUG, true), |
| DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features, |
| VIRTIO_SCSI_F_CHANGE, true), |
| DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread, |
| TYPE_IOTHREAD, IOThread *), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static const VMStateDescription vmstate_virtio_scsi = { |
| .name = "virtio-scsi", |
| .minimum_version_id = 1, |
| .version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_VIRTIO_DEVICE, |
| VMSTATE_END_OF_LIST() |
| }, |
| }; |
| |
| static void virtio_scsi_common_class_init(ObjectClass *klass, void *data) |
| { |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| vdc->get_config = virtio_scsi_get_config; |
| set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| } |
| |
| static void virtio_scsi_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); |
| |
| device_class_set_props(dc, virtio_scsi_properties); |
| dc->vmsd = &vmstate_virtio_scsi; |
| set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| vdc->realize = virtio_scsi_device_realize; |
| vdc->unrealize = virtio_scsi_device_unrealize; |
| vdc->set_config = virtio_scsi_set_config; |
| vdc->get_features = virtio_scsi_get_features; |
| vdc->reset = virtio_scsi_reset; |
| vdc->start_ioeventfd = virtio_scsi_dataplane_start; |
| vdc->stop_ioeventfd = virtio_scsi_dataplane_stop; |
| hc->pre_plug = virtio_scsi_pre_hotplug; |
| hc->plug = virtio_scsi_hotplug; |
| hc->unplug = virtio_scsi_hotunplug; |
| } |
| |
| static const TypeInfo virtio_scsi_common_info = { |
| .name = TYPE_VIRTIO_SCSI_COMMON, |
| .parent = TYPE_VIRTIO_DEVICE, |
| .instance_size = sizeof(VirtIOSCSICommon), |
| .abstract = true, |
| .class_init = virtio_scsi_common_class_init, |
| }; |
| |
| static const TypeInfo virtio_scsi_info = { |
| .name = TYPE_VIRTIO_SCSI, |
| .parent = TYPE_VIRTIO_SCSI_COMMON, |
| .instance_size = sizeof(VirtIOSCSI), |
| .class_init = virtio_scsi_class_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_HOTPLUG_HANDLER }, |
| { } |
| } |
| }; |
| |
| static void virtio_register_types(void) |
| { |
| type_register_static(&virtio_scsi_common_info); |
| type_register_static(&virtio_scsi_info); |
| } |
| |
| type_init(virtio_register_types) |
