drm/virtio: implement context init: add virtio_gpu_fence_event
authorGurchetan Singh <gurchetansingh@chromium.org>
Tue, 21 Sep 2021 23:20:23 +0000 (16:20 -0700)
committerGerd Hoffmann <kraxel@redhat.com>
Wed, 29 Sep 2021 07:22:31 +0000 (09:22 +0200)
commitcd7f5ca33585918febe5e2f6dc090a21cfa775b0
tree6bbee480a5b3c6073de5ffcdea6c9be2bd3f6771
parent8d6b006e1f51c99016aa39ca9e03947cbdd024e3
drm/virtio: implement context init: add virtio_gpu_fence_event

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>
drivers/gpu/drm/virtio/virtgpu_drv.c
drivers/gpu/drm/virtio/virtgpu_drv.h
drivers/gpu/drm/virtio/virtgpu_fence.c
drivers/gpu/drm/virtio/virtgpu_ioctl.c