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

Honglei Huang
2024-12-20T10:04:37Z

From: Honglei Huang <Honglei1.Huang@amd.com>

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 <Honglei1.Huang@amd.com>
---
include/uapi/linux/virtio_gpu.h | 2 ++
1 file changed, 2 insertions(+)

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;
--
2.34.1