lkml.org 
[lkml]   [2012]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 3/3] virtio-scsi: add power management support
Date
This patch adds freeze/restore handlers for the HBA.  Block queues
are managed independently by the disk devices.

Cc: linux-scsi <linux-scsi@vger.kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
The feature has been merged in the virtio core for 3.3, so the patch
is new in v4.

drivers/scsi/virtio_scsi.c | 26 +++++++++++++++++++++++---
1 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 68104cd..efccd72 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -406,8 +406,8 @@ static struct scsi_host_template virtscsi_host_template = {
&__val, sizeof(__val)); \
})

-static int __devinit virtscsi_init(struct virtio_device *vdev,
- struct virtio_scsi *vscsi)
+static int virtscsi_init(struct virtio_device *vdev,
+ struct virtio_scsi *vscsi)
{
int err;
struct virtqueue *vqs[3];
@@ -491,7 +491,7 @@ virtscsi_init_failed:
return err;
}

-static void __devexit virtscsi_remove_vqs(struct virtio_device *vdev)
+static void virtscsi_remove_vqs(struct virtio_device *vdev)
{
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
@@ -509,6 +509,22 @@ static void __devexit virtscsi_remove(struct virtio_device *vdev)
scsi_host_put(shost);
}

+#ifdef CONFIG_PM
+static int virtscsi_freeze(struct virtio_device *vdev)
+{
+ virtscsi_remove_vqs(vdev);
+ return 0;
+}
+
+static int virtscsi_restore(struct virtio_device *vdev)
+{
+ struct Scsi_Host *sh = virtio_scsi_host(vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+
+ return virtscsi_init(vdev, vscsi);
+}
+#endif
+
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID },
{ 0 },
@@ -519,6 +535,10 @@ static struct virtio_driver virtio_scsi_driver = {
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = virtscsi_probe,
+#ifdef CONFIG_PM
+ .freeze = virtscsi_freeze,
+ .restore = virtscsi_restore,
+#endif
.remove = __devexit_p(virtscsi_remove),
};

--
1.7.1


\
 
 \ /
  Last update: 2012-01-20 17:49    [W:0.123 / U:0.808 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site