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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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34
drivers/gpu/drm/virtio/virtgpu_ioctl.c
View File

@@ -38,6 +38,36 @@
VIRTGPU_BLOB_FLAG_USE_SHAREABLE | \
VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)
static int virtio_gpu_fence_event_create(struct drm_device *dev,
struct drm_file *file,
struct virtio_gpu_fence *fence,
uint32_t ring_idx)
{
struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
struct virtio_gpu_fence_event *e = NULL;
int ret;
if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
return 0;
e = kzalloc(sizeof(*e), GFP_KERNEL);
if (!e)
return -ENOMEM;
e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL;
e->event.length = sizeof(e->event);
ret = drm_event_reserve_init(dev, file, &e->base, &e->event);
if (ret)
goto free;
fence->e = e;
return 0;
free:
kfree(e);
return ret;
}
/* Must be called with &virtio_gpu_fpriv.struct_mutex held. */
static void virtio_gpu_create_context_locked(struct virtio_gpu_device *vgdev,
struct virtio_gpu_fpriv *vfpriv)
@@ -195,6 +225,10 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
goto out_unresv;
}
ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
if (ret)
goto out_unresv;
if (out_fence_fd >= 0) {
sync_file = sync_file_create(&out_fence->f);
if (!sync_file) {