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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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10
drivers/gpu/drm/virtio/virtgpu_fence.c
View File

@@ -152,11 +152,21 @@ void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
continue;
dma_fence_signal_locked(&curr->f);
if (curr->e) {
drm_send_event(vgdev->ddev, &curr->e->base);
curr->e = NULL;
}
list_del(&curr->node);
dma_fence_put(&curr->f);
}
dma_fence_signal_locked(&signaled->f);
if (signaled->e) {
drm_send_event(vgdev->ddev, &signaled->e->base);
signaled->e = NULL;
}
list_del(&signaled->node);
dma_fence_put(&signaled->f);
break;