virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff
Handle thaw, restore and freeze notifications from the PM core. Expose
these to individual virtio drivers that can quiesce and resume vq
operations. For drivers not implementing the thaw() method, use the
restore method instead.
These functions also save device-specific data so that the device can be
put in pre-suspend state after resume, and disable and enable the PCI
device in the freeze and resume functions, respectively.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 31fe3a6..d0018d2 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -94,6 +94,11 @@
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 (*thaw)(struct virtio_device *dev);
+ int (*restore)(struct virtio_device *dev);
+#endif
};
int register_virtio_driver(struct virtio_driver *drv);