[RFC,1/3] virtio-gpu api: add blob userptr resource

Commit Message

Honglei Huang Dec. 20, 2024, 10:04 a.m. UTC

From: Honglei Huang <[e-mail]>

Add a new resource for blob resource, called userptr, used for let
host access guest user space memory, to acquire a simple SVM features
in virtio GPU.

- The capset VIRTIO_GPU_CAPSET_HSAKMT used for context init,
in this series patches only HSAKMT context can use the userptr
feature. HSAKMT is a GPU compute library in HSA stack, like
the role libdrm in mesa stack.
- New flag VIRTIO_GPU_BLOB_FLAG_USE_USERPTR used in blob create
to indicate the blob create ioctl is used for create a userptr
blob resource.

Signed-off-by: Honglei Huang <[e-mail]>
---
 include/uapi/linux/virtio_gpu.h | 2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
index b9a9783f0b14..0a6b56acbc13 100644
--- a/include/uapi/linux/virtio_gpu.h
+++ b/include/uapi/linux/virtio_gpu.h
@@ -323,6 +323,7 @@  struct virtio_gpu_cmd_submit {
 
 #define VIRTIO_GPU_CAPSET_VIRGL 1
 #define VIRTIO_GPU_CAPSET_VIRGL2 2
+#define VIRTIO_GPU_CAPSET_HSAKMT 7
 
 /* VIRTIO_GPU_CMD_GET_CAPSET_INFO */
 struct virtio_gpu_get_capset_info {
@@ -415,6 +416,7 @@  struct virtio_gpu_resource_create_blob {
 #define VIRTIO_GPU_BLOB_FLAG_USE_MAPPABLE     0x0001
 #define VIRTIO_GPU_BLOB_FLAG_USE_SHAREABLE    0x0002
 #define VIRTIO_GPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004
+#define VIRTIO_GPU_BLOB_FLAG_USE_USERPTR      0x0008
 	/* zero is invalid blob mem */
 	__le32 blob_mem;
 	__le32 blob_flags;