linux-kernel - [PATCH v1 2/7] drm/virtgpu api: add blob userptr resource

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Message-ID: <20250228053650.393646-3-honglei1.huang@amd.com>
Date: Fri, 28 Feb 2025 13:36:45 +0800
From: Honglei Huang <honglei1.huang@....com>
To: David Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
	Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu <olvaffe@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
	<mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Simona Vetter
	<simona@...ll.ch>, Rob Clark <robdclark@...il.com>, Huang Rui
	<ray.huang@....com>
CC: <dri-devel@...ts.freedesktop.org>, <virtualization@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Demi Marie Obenour <demiobenour@...il.com>,
	Dmitry Osipenko <dmitry.osipenko@...labora.com>, Honglei Huang
	<Honglei1.Huang@....com>
Subject: [PATCH v1 2/7] drm/virtgpu api: add blob userptr resource

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

This makes blob userptr resource available to guest userspace.

- Flag VIRTGPU_BLOB_FLAG_USE_USERPTR for guest userspace blob create,
enable this flag to indicate blob userptr resource create.
- Flag VIRTGPU_BLOB_FLAG_USERPTR_RDONLY used for read only userptr,
if not set then the userptr will be writeable.
- New parameter blob_userptr for bypass userspace memory address to
virtio GPU, like other userptr design, virtio GPU needs a userspace
memory for device access.

Used for userptr feature, in compute side, this feature is basic and
essential. Let device to access userspace memory directly instead of
copying.

Signed-off-by: Honglei Huang <Honglei1.Huang@....com>
---
 include/uapi/drm/virtgpu_drm.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h
index c2ce71987e9b..071f31752721 100644
--- a/include/uapi/drm/virtgpu_drm.h
+++ b/include/uapi/drm/virtgpu_drm.h
@@ -179,13 +179,14 @@ struct drm_virtgpu_resource_create_blob {
 #define VIRTGPU_BLOB_FLAG_USE_MAPPABLE     0x0001
 #define VIRTGPU_BLOB_FLAG_USE_SHAREABLE    0x0002
 #define VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004
+#define VIRTGPU_BLOB_FLAG_USE_USERPTR      0x0008
+#define VIRTGPU_BLOB_FLAG_USERPTR_RDONLY   0x0010
 	/* zero is invalid blob_mem */
 	__u32 blob_mem;
 	__u32 blob_flags;
 	__u32 bo_handle;
 	__u32 res_handle;
 	__u64 size;
-
 	/*
 	 * for 3D contexts with VIRTGPU_BLOB_MEM_HOST3D_GUEST and
 	 * VIRTGPU_BLOB_MEM_HOST3D otherwise, must be zero.
@@ -194,6 +195,7 @@ struct drm_virtgpu_resource_create_blob {
 	__u32 cmd_size;
 	__u64 cmd;
 	__u64 blob_id;
+	__u64 userptr;
 };
 
 #define VIRTGPU_CONTEXT_PARAM_CAPSET_ID       0x0001
-- 
2.34.1