This patch introduces a new method in the vdpa_config_ops which
reports the physical address and the size of the doorbell for a
specific virtqueue.
This will be used by the future patches that maps doorbell to
userspace.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
include/linux/vdpa.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 5453af87a33e..239db794357c 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -17,6 +17,16 @@ struct vdpa_callback {
void *private;
};
+/**
+ * vDPA notification area
+ * @addr: base address of the notification area
+ * @size: size of the notification area
+ */
+struct vdpa_notification_area {
+ resource_size_t addr;
+ resource_size_t size;
+};
+
/**
* vDPA device - representation of a vDPA device
* @dev: underlying device
@@ -73,6 +83,10 @@ struct vdpa_device {
* @vdev: vdpa device
* @idx: virtqueue index
* Returns virtqueue state (last_avail_idx)
+ * @get_vq_notification: Get the notification area for a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * Returns the notifcation area
* @get_vq_align: Get the virtqueue align requirement
* for the device
* @vdev: vdpa device
@@ -162,6 +176,8 @@ struct vdpa_config_ops {
bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, u64 state);
u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx);
+ struct vdpa_notification_area
+ (*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
/* Device ops */
u32 (*get_vq_align)(struct vdpa_device *vdev);
--
2.20.1
