Add an optional notify() callback to virtio_driver. A backend
driver can provide this callback to perform actions for a lost
device.
notify() event values are inherited from virtio_ccw's notify()
callback. We might want to support even more of them lateron.
notify() return values are defined in include/linux/notifier.h.
Signed-off-by: Heinz Graalfs <graa...@linux.vnet.ibm.com>
---
drivers/virtio/virtio.c | 8 ++++++++
include/linux/virtio.h | 10 ++++++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index ee59b74..a09abb4 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -186,6 +186,14 @@ void unregister_virtio_driver(struct virtio_driver *driver)
}
EXPORT_SYMBOL_GPL(unregister_virtio_driver);
+int notify_virtio_device(struct virtio_device *vdev, int event)
+{
+ struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver);
+
+ return drv->notify ? drv->notify(vdev, event) : NOTIFY_DONE;
+}
+EXPORT_SYMBOL_GPL(notify_virtio_device);
+
int register_virtio_device(struct virtio_device *dev)
{
int err;
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index f15f6e7..da18e9a 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -110,6 +110,15 @@ int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);
/**
+ * notify event values
+ * @VDEV_GONE: device gone
+ */
+enum {
+ VDEV_GONE = 1,
+};
+int notify_virtio_device(struct virtio_device *dev, int event);
+
+/**
* virtio_driver - operations for a virtio I/O driver
* @driver: underlying device driver (populate name and owner).
* @id_table: the ids serviced by this driver.
@@ -129,6 +138,7 @@ struct virtio_driver {
void (*scan)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);
void (*config_changed)(struct virtio_device *dev);
+ int (*notify)(struct virtio_device *dev, int event);
#ifdef CONFIG_PM
int (*freeze)(struct virtio_device *dev);
int (*restore)(struct virtio_device *dev);
--
1.8.3.1
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