[PATCH v3 1/8] vdpa: add bind_mm/unbind_mm callbacks

Stefano Garzarella
2023-03-21T15:43:33Z

These new optional callbacks is used to bind/unbind the device to
a specific address space so the vDPA framework can use VA when
these callbacks are implemented.

Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---

Notes:
v2:
- removed `struct task_struct *owner` param (unused for now, maybe
useful to support cgroups) [Jason]
- add unbind_mm callback [Jason]

include/linux/vdpa.h | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 43f59ef10cc9..369c21394284 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -290,6 +290,14 @@ struct vdpa_map_file {
* @vdev: vdpa device
* @idx: virtqueue index
* Returns pointer to structure device or error (NULL)
+ * @bind_mm: Bind the device to a specific address space
+ * so the vDPA framework can use VA when this
+ * callback is implemented. (optional)
+ * @vdev: vdpa device
+ * @mm: address space to bind
+ * @unbind_mm: Unbind the device from the address space
+ * bound using the bind_mm callback. (optional)
+ * @vdev: vdpa device
* @free: Free resources that belongs to vDPA (optional)
* @vdev: vdpa device
*/
@@ -351,6 +359,8 @@ struct vdpa_config_ops {
int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
unsigned int asid);
struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx);
+ int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm);
+ void (*unbind_mm)(struct vdpa_device *vdev);

/* Free device resources */
void (*free)(struct vdpa_device *vdev);
--
2.39.2