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drm/virtgpu api: define a dummy fence signaled event

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The current virtgpu implementation of poll(..) drops events
when VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK is enabled (otherwise
it's like a normal DRM driver).

This is because paravirtualized userspaces receives responses in a
buffer of type BLOB_MEM_GUEST, not by read(..).

To be in line with other DRM drivers and avoid specialized behavior,
it is possible to define a dummy event for virtgpu.  Paravirtualized
userspace will now have to call read(..) on the DRM fd to receive the
dummy event.

Fixes: b10790434c ("drm/virtgpu api: create context init feature")
Reported-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20211122232210.602-2-gurchetansingh@google.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gurchetan Singh 2021-11-22 15:22:09 -08:00 committed by Gerd Hoffmann
parent e048834c20
commit 7e78781df4
3 changed files with 8 additions and 2 deletions
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1
drivers/gpu/drm/virtio/virtgpu_drv.h
View File

@ -138,7 +138,6 @@ 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;

2
drivers/gpu/drm/virtio/virtgpu_ioctl.c
View File

@ -54,7 +54,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
if (!e)
return -ENOMEM;
e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL;
e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED;
e->event.length = sizeof(e->event);
ret = drm_event_reserve_init(dev, file, &e->base, &e->event);

7
include/uapi/drm/virtgpu_drm.h
View File

@ -196,6 +196,13 @@ struct drm_virtgpu_context_init {
__u64 ctx_set_params;
};
/*
* Event code that's given when VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK is in
* effect. The event size is sizeof(drm_event), since there is no additional
* payload.
*/
#define VIRTGPU_EVENT_FENCE_SIGNALED 0x90000000
#define DRM_IOCTL_VIRTGPU_MAP \
DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_MAP, struct drm_virtgpu_map)