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virtio-scsi: Implement hotplug support for virtio-scsi

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Implement the hotplug() and hot_unplug() interfaces in virtio-scsi, by signal
the virtio_scsi.ko in guest kernel via event virtual queue.

The counterpart patch of virtio_scsi.ko will be sent soon in another thread.

Signed-off-by: Sen Wang <senwang@linux.vnet.ibm.com>
Signed-off-by: Cong Meng <mc@linux.vnet.ibm.com>
[ Add memset, fix LUN field, placate checkpatch - Paolo ]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cong Meng 2012-06-20 14:47:11 +08:00 committed by Paolo Bonzini
parent 53200fad0e
commit b6866fee58
1 changed files with 70 additions and 2 deletions
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72
hw/virtio-scsi.c
View file

@ -24,6 +24,10 @@
#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
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
#define VIRTIO_SCSI_S_OVERRUN 1
@ -60,6 +64,11 @@
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
/* 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 {
uint8_t lun[8]; /* Logical Unit Number */
@ -206,11 +215,13 @@ 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) {
@ -545,6 +556,7 @@ 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);
return requested_features;
}
@ -577,6 +589,60 @@ 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;
if (req) {
int in_size;
if (req->elem.out_num || req->elem.in_num != 1) {
virtio_scsi_bad_req();
}
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;
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_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 +651,8 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = {
.complete = virtio_scsi_command_complete,
.cancel = virtio_scsi_request_cancelled,
.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,