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virtio-scsi: reset virtqueue affinity when doing cpu hotplug 

Add hot cpu notifier to reset the request virtqueue affinity
when doing cpu hotplug.

Cc: linux-scsi@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Asias He <asias@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Wanlong Gao 2013-04-08 23:05:49 +09:30 committed by Rusty Russell
parent 9141a4ca0d
commit 285e71ea6f
1 changed files with 29 additions and 0 deletions
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29
drivers/scsi/virtio_scsi.c
View File

@ -110,6 +110,9 @@ struct virtio_scsi {
/* If the affinity hint is set for virtqueues */
bool affinity_hint_set;
/* CPU hotplug notifier */
struct notifier_block nb;
struct virtio_scsi_vq ctrl_vq;
struct virtio_scsi_vq event_vq;
struct virtio_scsi_vq req_vqs[];
@ -762,6 +765,23 @@ static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity)
put_online_cpus();
}
static int virtscsi_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
struct virtio_scsi *vscsi = container_of(nfb, struct virtio_scsi, nb);
switch(action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
__virtscsi_set_affinity(vscsi, true);
break;
default:
break;
}
return NOTIFY_OK;
}
static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
struct virtqueue *vq)
{
@ -884,6 +904,13 @@ static int virtscsi_probe(struct virtio_device *vdev)
if (err)
goto virtscsi_init_failed;
vscsi->nb.notifier_call = &virtscsi_cpu_callback;
err = register_hotcpu_notifier(&vscsi->nb);
if (err) {
pr_err("registering cpu notifier failed\n");
goto scsi_add_host_failed;
}
cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
@ -921,6 +948,8 @@ static void virtscsi_remove(struct virtio_device *vdev)
scsi_remove_host(shost);
unregister_hotcpu_notifier(&vscsi->nb);
virtscsi_remove_vqs(vdev);
scsi_host_put(shost);
}