#define VIRTIO_SCSI_T_NO_EVENT 0
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+#define VIRTIO_SCSI_T_PARAM_CHANGE 3
+
+/* Reasons for transport reset event */
+#define VIRTIO_SCSI_EVT_RESET_HARD 0
+#define VIRTIO_SCSI_EVT_RESET_RESCAN 1
+#define VIRTIO_SCSI_EVT_RESET_REMOVED 2
/* SCSI command request, followed by data-out */
typedef struct {
uint32_t sense_size;
uint32_t cdb_size;
int resetting;
+ bool events_dropped;
VirtQueue *ctrl_vq;
VirtQueue *event_vq;
VirtQueue *cmd_vqs[0];
}
static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
- target_phys_addr_t *addr, int num)
+ hwaddr *addr, int num)
{
memset(qsgl, 0, sizeof(*qsgl));
while (num--) {
static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq,
VirtIOSCSIReq *req)
{
- assert(req->elem.out_num && req->elem.in_num);
+ assert(req->elem.in_num);
req->vq = vq;
req->dev = s;
req->sreq = NULL;
- req->req.buf = req->elem.out_sg[0].iov_base;
+ if (req->elem.out_num) {
+ req->req.buf = req->elem.out_sg[0].iov_base;
+ }
req->resp.buf = req->elem.in_sg[0].iov_base;
if (req->elem.out_num > 1) {
{
SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun);
SCSIRequest *r, *next;
- DeviceState *qdev;
+ BusChild *kid;
int target;
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
goto incorrect_lun;
}
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
- if (r->tag == req->req.tmf->tag) {
+ VirtIOSCSIReq *cmd_req = r->hba_private;
+ if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) {
break;
}
}
- if (r && r->hba_private) {
+ 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".
case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
target = req->req.tmf->lun[1];
s->resetting++;
- QTAILQ_FOREACH(qdev, &s->bus.qbus.children, sibling) {
- d = DO_UPCAST(SCSIDevice, qdev, qdev);
+ QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
+ d = DO_UPCAST(SCSIDevice, qdev, kid->child);
if (d->channel == 0 && d->id == target) {
qdev_reset_all(&d->qdev);
}
s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
+ s->events_dropped = false;
}
/* The device does not have anything to save beyond the virtio data.
return 0;
}
+static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
+ uint32_t event, uint32_t reason)
+{
+ VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq);
+ VirtIOSCSIEvent *evt;
+ int in_size;
+
+ if (!req) {
+ s->events_dropped = true;
+ return;
+ }
+
+ if (req->elem.out_num || req->elem.in_num != 1) {
+ virtio_scsi_bad_req();
+ }
+
+ if (s->events_dropped) {
+ event |= VIRTIO_SCSI_T_EVENTS_MISSED;
+ s->events_dropped = false;
+ }
+
+ in_size = req->elem.in_sg[0].iov_len;
+ if (in_size < sizeof(VirtIOSCSIEvent)) {
+ virtio_scsi_bad_req();
+ }
+
+ evt = req->resp.event;
+ memset(evt, 0, sizeof(VirtIOSCSIEvent));
+ evt->event = event;
+ evt->reason = reason;
+ if (!dev) {
+ assert(event == VIRTIO_SCSI_T_NO_EVENT);
+ } 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);
+}
+
+static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+
+ if (s->events_dropped) {
+ virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
+ }
+}
+
+static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
+{
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+
+ if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
+ (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ dev->type != TYPE_ROM) {
+ virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
+ sense.asc | (sense.ascq << 8));
+ }
+}
+
+static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
+{
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+
+ if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) &&
+ (s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
+ VIRTIO_SCSI_EVT_RESET_RESCAN);
+ }
+}
+
+static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
+{
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+
+ if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
+ virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
+ VIRTIO_SCSI_EVT_RESET_REMOVED);
+ }
+}
+
static struct SCSIBusInfo virtio_scsi_scsi_info = {
.tcq = true,
.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
.complete = virtio_scsi_command_complete,
.cancel = virtio_scsi_request_cancelled,
+ .change = virtio_scsi_change,
+ .hotplug = virtio_scsi_hotplug,
+ .hot_unplug = virtio_scsi_hot_unplug,
.get_sg_list = virtio_scsi_get_sg_list,
.save_request = virtio_scsi_save_request,
.load_request = virtio_scsi_load_request,
s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
virtio_scsi_handle_ctrl);
s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
- NULL);
+ virtio_scsi_handle_event);
for (i = 0; i < s->conf->num_queues; i++) {
s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
virtio_scsi_handle_cmd);
projects / qemu.git / blobdiff