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drm/virtio: add in/out fence support for explicit synchronization

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When the execbuf call receives an in-fence it will get the dma_fence
related to that fence fd and wait on it before submitting the draw call.

On the out-fence side we get fence returned by the submitted draw call
and attach it to a sync_file and send the sync_file fd to userspace. On
error -1 is returned to userspace.

VIRTGPU_EXECBUF_FENCE_FD_IN & VIRTGPU_EXECBUF_FENCE_FD_OUT
are supported at the simultaneously and can be flagged
for simultaneously.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20181112165157.32765-4-robert.foss@collabora.com
Suggested-by: Rob Herring <robh@kernel.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Robert Foss
2018-11-12 17:51:56 +01:00
committed by Gerd Hoffmann
parent a56f9c868c
commit 2cd7b6f08b
2 changed files with 66 additions and 19 deletions
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2
include/uapi/drm/virtgpu_drm.h
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@@ -66,7 +66,7 @@ struct drm_virtgpu_execbuffer {
__u64 command; /* void* */
__u64 bo_handles;
__u32 num_bo_handles;
__s32 fence_fd;
__s32 fence_fd; /* in/out fence fd (see VIRTGPU_EXECBUF_FENCE_FD_IN/OUT) */
};
#define VIRTGPU_PARAM_3D_FEATURES 1 /* do we have 3D features in the hw */