diff options
Diffstat (limited to 'qemu/hw/scsi/virtio-scsi.c')
| -rw-r--r-- | qemu/hw/scsi/virtio-scsi.c | 1054 |
1 files changed, 0 insertions, 1054 deletions
diff --git a/qemu/hw/scsi/virtio-scsi.c b/qemu/hw/scsi/virtio-scsi.c deleted file mode 100644 index 30415c6a9..000000000 --- a/qemu/hw/scsi/virtio-scsi.c +++ /dev/null @@ -1,1054 +0,0 @@ -/* - * 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 "qemu/error-report.h" -#include "qemu/iov.h" -#include "sysemu/block-backend.h" -#include <hw/scsi/scsi.h> -#include <block/scsi.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) -{ - 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, &address_space_memory); - 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_scsi_dataplane_notify(vdev, req); - } 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(void) -{ - error_report("wrong size for virtio-scsi headers"); - exit(1); -} - -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); - uint32_t n = virtio_queue_get_id(req->vq) - 2; - - assert(n < vs->conf.num_queues); - qemu_put_be32s(f, &n); - qemu_put_virtqueue_element(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); - VirtIOSCSIReq *req; - uint32_t n; - - qemu_get_be32s(f, &n); - assert(n < vs->conf.num_queues); - req = qemu_get_virtqueue_element(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); -} - -/* 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; - - if (s->dataplane_started && d) { - assert(blk_get_aio_context(d->conf.blk) == s->ctx); - } - /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */ - req->resp.tmf.response = VIRTIO_SCSI_S_OK; - - virtio_tswap32s(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(); - 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(); - } 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(); - } 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); - } -} - -void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq) -{ - VirtIOSCSIReq *req; - - while ((req = virtio_scsi_pop_req(s, vq))) { - virtio_scsi_handle_ctrl_req(s, req); - } -} - -static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) -{ - VirtIOSCSI *s = (VirtIOSCSI *)vdev; - - if (s->ctx) { - virtio_scsi_dataplane_start(s); - if (!s->dataplane_fenced) { - return; - } - } - virtio_scsi_handle_ctrl_vq(s, vq); -} - -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 bool 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); - } else { - virtio_scsi_bad_req(); - } - return false; - } - - 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 false; - } - if (s->dataplane_started) { - assert(blk_get_aio_context(d->conf.blk) == s->ctx); - } - 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 false; - } - scsi_req_ref(req->sreq); - blk_io_plug(d->conf.blk); - return true; -} - -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); -} - -void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq) -{ - VirtIOSCSIReq *req, *next; - QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs); - - while ((req = virtio_scsi_pop_req(s, vq))) { - if (virtio_scsi_handle_cmd_req_prepare(s, req)) { - QTAILQ_INSERT_TAIL(&reqs, req, next); - } - } - - QTAILQ_FOREACH_SAFE(req, &reqs, next, next) { - virtio_scsi_handle_cmd_req_submit(s, req); - } -} - -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_scsi_dataplane_start(s); - if (!s->dataplane_fenced) { - return; - } - } - virtio_scsi_handle_cmd_vq(s, vq); -} - -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, 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) { - error_report("bad data written to virtio-scsi configuration space"); - exit(1); - } - - 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); - - if (s->ctx) { - virtio_scsi_dataplane_stop(s); - } - s->resetting++; - qbus_reset_all(&s->bus.qbus); - s->resetting--; - - vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE; - vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE; - s->events_dropped = false; -} - -/* The device does not have anything to save beyond the virtio data. - * Request data is saved with callbacks from SCSI devices. - */ -static void virtio_scsi_save(QEMUFile *f, void *opaque) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(opaque); - VirtIOSCSI *s = VIRTIO_SCSI(vdev); - - if (s->dataplane_started) { - virtio_scsi_dataplane_stop(s); - } - virtio_save(vdev, f); -} - -static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(opaque); - int ret; - - ret = virtio_load(vdev, f, version_id); - if (ret) { - return ret; - } - return 0; -} - -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; - } - - if (s->dataplane_started) { - assert(s->ctx); - aio_context_acquire(s->ctx); - } - - req = virtio_scsi_pop_req(s, vs->event_vq); - if (!req) { - s->events_dropped = true; - goto out; - } - - 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(); - } - - 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); -out: - if (s->dataplane_started) { - aio_context_release(s->ctx); - } -} - -void 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); - } -} - -static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) -{ - VirtIOSCSI *s = VIRTIO_SCSI(vdev); - - if (s->ctx) { - virtio_scsi_dataplane_start(s); - if (!s->dataplane_fenced) { - return; - } - } - virtio_scsi_handle_event_vq(s, vq); -} - -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_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, - sense.asc | (sense.ascq << 8)); - } -} - -static void virtio_scsi_blk_insert_notifier(Notifier *n, void *data) -{ - VirtIOSCSIBlkChangeNotifier *cn = DO_UPCAST(VirtIOSCSIBlkChangeNotifier, - n, n); - assert(cn->sd->conf.blk == data); - blk_op_block_all(cn->sd->conf.blk, cn->s->blocker); -} - -static void virtio_scsi_blk_remove_notifier(Notifier *n, void *data) -{ - VirtIOSCSIBlkChangeNotifier *cn = DO_UPCAST(VirtIOSCSIBlkChangeNotifier, - n, n); - assert(cn->sd->conf.blk == data); - blk_op_unblock_all(cn->sd->conf.blk, cn->s->blocker); -} - -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); - - if (s->ctx && !s->dataplane_fenced) { - VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; - - if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { - return; - } - blk_op_block_all(sd->conf.blk, s->blocker); - aio_context_acquire(s->ctx); - blk_set_aio_context(sd->conf.blk, s->ctx); - aio_context_release(s->ctx); - - insert_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1); - insert_notifier->n.notify = virtio_scsi_blk_insert_notifier; - insert_notifier->s = s; - insert_notifier->sd = sd; - blk_add_insert_bs_notifier(sd->conf.blk, &insert_notifier->n); - QTAILQ_INSERT_TAIL(&s->insert_notifiers, insert_notifier, next); - - remove_notifier = g_new0(VirtIOSCSIBlkChangeNotifier, 1); - remove_notifier->n.notify = virtio_scsi_blk_remove_notifier; - remove_notifier->s = s; - remove_notifier->sd = sd; - blk_add_remove_bs_notifier(sd->conf.blk, &remove_notifier->n); - QTAILQ_INSERT_TAIL(&s->remove_notifiers, remove_notifier, next); - } - - if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { - virtio_scsi_push_event(s, sd, - VIRTIO_SCSI_T_TRANSPORT_RESET, - VIRTIO_SCSI_EVT_RESET_RESCAN); - } -} - -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); - VirtIOSCSIBlkChangeNotifier *insert_notifier, *remove_notifier; - - if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { - virtio_scsi_push_event(s, sd, - VIRTIO_SCSI_T_TRANSPORT_RESET, - VIRTIO_SCSI_EVT_RESET_REMOVED); - } - - if (s->ctx) { - blk_op_unblock_all(sd->conf.blk, s->blocker); - } - - QTAILQ_FOREACH(insert_notifier, &s->insert_notifiers, next) { - if (insert_notifier->sd == sd) { - notifier_remove(&insert_notifier->n); - QTAILQ_REMOVE(&s->insert_notifiers, insert_notifier, next); - g_free(insert_notifier); - break; - } - } - - QTAILQ_FOREACH(remove_notifier, &s->remove_notifiers, next) { - if (remove_notifier->sd == sd) { - notifier_remove(&remove_notifier->n); - QTAILQ_REMOVE(&s->remove_notifiers, remove_notifier, next); - g_free(remove_notifier); - break; - } - } - - qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); -} - -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, Error **errp, - HandleOutput ctrl, HandleOutput evt, - HandleOutput cmd) -{ - 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; - } - 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, VIRTIO_SCSI_VQ_SIZE, - ctrl); - s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE, - evt); - for (i = 0; i < s->conf.num_queues; i++) { - s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE, - cmd); - } - - if (s->conf.iothread) { - virtio_scsi_set_iothread(VIRTIO_SCSI(s), s->conf.iothread); - } -} - -static void virtio_scsi_device_realize(DeviceState *dev, Error **errp) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VirtIOSCSI *s = VIRTIO_SCSI(dev); - static int virtio_scsi_id; - Error *err = NULL; - - virtio_scsi_common_realize(dev, &err, virtio_scsi_handle_ctrl, - virtio_scsi_handle_event, - virtio_scsi_handle_cmd); - 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), dev, &error_abort); - - if (!dev->hotplugged) { - scsi_bus_legacy_handle_cmdline(&s->bus, &err); - if (err != NULL) { - error_propagate(errp, err); - return; - } - } - - register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, - virtio_scsi_save, virtio_scsi_load, s); - - error_setg(&s->blocker, "block device is in use by data plane"); - - QTAILQ_INIT(&s->insert_notifiers); - QTAILQ_INIT(&s->remove_notifiers); -} - -static void virtio_scsi_instance_init(Object *obj) -{ - VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(obj); - - object_property_add_link(obj, "iothread", TYPE_IOTHREAD, - (Object **)&vs->conf.iothread, - qdev_prop_allow_set_link_before_realize, - OBJ_PROP_LINK_UNREF_ON_RELEASE, &error_abort); -} - -void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); - - g_free(vs->cmd_vqs); - virtio_cleanup(vdev); -} - -static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp) -{ - VirtIOSCSI *s = VIRTIO_SCSI(dev); - - error_free(s->blocker); - - unregister_savevm(dev, "virtio-scsi", s); - virtio_scsi_common_unrealize(dev, errp); -} - -static Property virtio_scsi_properties[] = { - DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1), - 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_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); - - dc->props = virtio_scsi_properties; - 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; - 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), - .instance_init = virtio_scsi_instance_init, - .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) |