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drm/virtio: implement context init: add virtio_gpu_fence_event

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Similar to DRM_VMW_EVENT_FENCE_SIGNALED.  Sends a pollable event
to the DRM file descriptor when a fence on a specific ring is
signaled.

One difference is the event is not exposed via the UAPI -- this is
because host responses are on a shared memory buffer of type
BLOB_MEM_GUEST [this is the common way to receive responses with
virtgpu].  As such, there is no context specific read(..)
implementation either -- just a poll(..) implementation.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Nicholas Verne <nverne@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20210921232024.817-12-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gurchetan Singh
2021-09-21 16:20:23 -07:00
committed by Gerd Hoffmann
parent 8d6b006e1f
commit cd7f5ca335
4 changed files with 93 additions and 1 deletions
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7
drivers/gpu/drm/virtio/virtgpu_drv.h
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@@ -138,11 +138,18 @@ struct virtio_gpu_fence_driver {
spinlock_t lock;
};
#define VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL 0x10000000
struct virtio_gpu_fence_event {
struct drm_pending_event base;
struct drm_event event;
};
struct virtio_gpu_fence {
struct dma_fence f;
uint32_t ring_idx;
uint64_t fence_id;
bool emit_fence_info;
struct virtio_gpu_fence_event *e;
struct virtio_gpu_fence_driver *drv;
struct list_head node;
};