diff options
Diffstat (limited to 'hw/virtio-scsi.c')
| -rw-r--r-- | hw/virtio-scsi.c | 115 |
1 files changed, 109 insertions, 6 deletions
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c index 0a5ac40e2f..c4a5b22f94 100644 --- a/hw/virtio-scsi.c +++ b/hw/virtio-scsi.c @@ -24,6 +24,11 @@ #define VIRTIO_SCSI_MAX_TARGET 255 #define VIRTIO_SCSI_MAX_LUN 16383 +/* Feature Bits */ +#define VIRTIO_SCSI_F_INOUT 0 +#define VIRTIO_SCSI_F_HOTPLUG 1 +#define VIRTIO_SCSI_F_CHANGE 2 + /* Response codes */ #define VIRTIO_SCSI_S_OK 0 #define VIRTIO_SCSI_S_OVERRUN 1 @@ -59,6 +64,12 @@ #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 { @@ -132,6 +143,7 @@ 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]; @@ -206,11 +218,13 @@ static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg, 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) { @@ -405,10 +419,6 @@ static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) } } -static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) -{ -} - static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, size_t resid) { @@ -545,6 +555,8 @@ static void virtio_scsi_set_config(VirtIODevice *vdev, static uint32_t virtio_scsi_get_features(VirtIODevice *vdev, uint32_t requested_features) { + requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG); + requested_features |= (1UL << VIRTIO_SCSI_F_CHANGE); return requested_features; } @@ -554,6 +566,7 @@ static void virtio_scsi_reset(VirtIODevice *vdev) 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. @@ -577,6 +590,93 @@ static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) 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, @@ -585,6 +685,9 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = { .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, |