linux-kernel - [PATCH 02/11] virtio-pci: add PM notification handlers for restore, freeze, thaw, poweroff

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Message-Id: <9f89dedd5e4e77c9244afde0ce22c1216a35c193.1317309123.git.amit.shah@redhat.com>
Date:	Thu, 29 Sep 2011 20:55:58 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Amit Shah <amit.shah@...hat.com>
Subject: [PATCH 02/11] virtio-pci: add PM notification handlers for restore, freeze, thaw, poweroff

Handle restore and freeze notification from the PM core.  Expose these
to individual virtio drivers that can quiesce and resume vq operations.

These functions also save device-specific data so that the device can be
put in pre-suspend state after resume.

Signed-off-by: Amit Shah <amit.shah@...hat.com>
---
 drivers/virtio/virtio_pci.c |   41 +++++++++++++++++++++++++++++++++++++++++
 include/linux/virtio.h      |    4 ++++
 2 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 6947620..cc70662 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -55,6 +55,10 @@ struct virtio_pci_device
 	unsigned msix_vectors;
 	/* Vectors allocated, excluding per-vq vectors if any */
 	unsigned msix_used_vectors;
+
+	/* Status saved during hibernate/restore */
+	u8 saved_status;
+
 	/* Whether we have vector per vq */
 	bool per_vq_vectors;
 };
@@ -703,9 +707,46 @@ static int virtio_pci_resume(struct device *dev)
 	return 0;
 }
 
+static int virtio_pci_freeze(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+	struct virtio_driver *drv;
+
+	drv = container_of(vp_dev->vdev.dev.driver,
+			   struct virtio_driver, driver);
+
+	vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
+	if (drv && drv->freeze)
+		return drv->freeze(&vp_dev->vdev);
+
+	return 0;
+}
+
+static int virtio_pci_restore(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+	struct virtio_driver *drv;
+
+	drv = container_of(vp_dev->vdev.dev.driver,
+			   struct virtio_driver, driver);
+
+	vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
+	vp_finalize_features(&vp_dev->vdev);
+	if (drv && drv->restore)
+		return drv->restore(&vp_dev->vdev);
+
+	return 0;
+}
+
 static const struct dev_pm_ops virtio_pci_pm_ops = {
 	.suspend = virtio_pci_suspend,
 	.resume  = virtio_pci_resume,
+	.freeze  = virtio_pci_freeze,
+	.thaw    = virtio_pci_restore,
+	.restore = virtio_pci_restore,
+	.poweroff = virtio_pci_suspend,
 };
 #endif
 
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 7108857..9afb662 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -141,6 +141,10 @@ struct virtio_driver {
 	int (*probe)(struct virtio_device *dev);
 	void (*remove)(struct virtio_device *dev);
 	void (*config_changed)(struct virtio_device *dev);
+#ifdef CONFIG_PM
+	int (*freeze)(struct virtio_device *dev);
+	int (*restore)(struct virtio_device *dev);
+#endif
 };
 
 int register_virtio_driver(struct virtio_driver *drv);
-- 
1.7.6.2

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