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virtio-scsi: introduce virtio_scsi_acquire/release 

These will be used more as soon as the acquire/release is pushed down to
the ioeventfd handlers.

Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-12-10 19:13:17 +01:00
parent c17a18ef30
commit e7a9f35321
1 changed files with 18 additions and 9 deletions
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27
hw/scsi/virtio-scsi.c
View File

@ -420,6 +420,20 @@ static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
}
}
static inline void virtio_scsi_acquire(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_acquire(s->ctx);
}
}
static inline void virtio_scsi_release(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_release(s->ctx);
}
}
void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)
{
VirtIOSCSIReq *req;
@ -691,10 +705,7 @@ void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
return;
}
if (s->dataplane_started) {
assert(s->ctx);
aio_context_acquire(s->ctx);
}
virtio_scsi_acquire(s);
req = virtio_scsi_pop_req(s, vs->event_vq);
if (!req) {
@ -730,9 +741,7 @@ void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
}
virtio_scsi_complete_req(req);
out:
if (s->dataplane_started) {
aio_context_release(s->ctx);
}
virtio_scsi_release(s);
}
void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
@ -778,9 +787,9 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
return;
}
aio_context_acquire(s->ctx);
virtio_scsi_acquire(s);
blk_set_aio_context(sd->conf.blk, s->ctx);
aio_context_release(s->ctx);
virtio_scsi_release(s);
}