[PATCH] dma-buf: remove trace_dma_fence_emit

[Christian König]

Add a few more people on CC.

Am 26.04.22 um 19:00 schrieb Christian König:
> There was never any significant difference between trace_dma_fence_emit()
> and trace_dma_fence_init() and the only place where it would made a
> significant difference was never implemented.
>
> So remove trace_dma_fence_emit() since we have an repeating issue that
> people are trying to use it for visualization and are surprised that
> it actually doesn't work for most drivers.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>   drivers/dma-buf/dma-fence.c             | 1 -
>   drivers/gpu/drm/nouveau/nouveau_fence.c | 1 -
>   drivers/gpu/drm/qxl/qxl_release.c       | 1 -
>   drivers/gpu/drm/virtio/virtgpu_fence.c  | 2 --
>   include/trace/events/dma_fence.h        | 7 -------
>   5 files changed, 12 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 066400ed8841..d0d704f3edae 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -20,7 +20,6 @@
>   #define CREATE_TRACE_POINTS
>   #include <trace/events/dma_fence.h>
>   
> -EXPORT_TRACEPOINT_SYMBOL(dma_fence_emit);
>   EXPORT_TRACEPOINT_SYMBOL(dma_fence_enable_signal);
>   EXPORT_TRACEPOINT_SYMBOL(dma_fence_signaled);
>   
> diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
> index 7f01dcf81fab..abcac7db4347 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_fence.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
> @@ -224,7 +224,6 @@ nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
>   			       &fctx->lock, fctx->context, ++fctx->sequence);
>   	kref_get(&fctx->fence_ref);
>   
> -	trace_dma_fence_emit(&fence->base);
>   	ret = fctx->emit(fence);
>   	if (!ret) {
>   		dma_fence_get(&fence->base);
> diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
> index 368d26da0d6a..cb9f27771f32 100644
> --- a/drivers/gpu/drm/qxl/qxl_release.c
> +++ b/drivers/gpu/drm/qxl/qxl_release.c
> @@ -424,7 +424,6 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
>   	 */
>   	dma_fence_init(&release->base, &qxl_fence_ops, &qdev->release_lock,
>   		       release->id | 0xf0000000, release->base.seqno);
> -	trace_dma_fence_emit(&release->base);
>   
>   	list_for_each_entry(entry, &release->bos, head) {
>   		bo = entry->bo;
> diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c
> index f28357dbde35..e8b6dec37977 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_fence.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_fence.c
> @@ -111,8 +111,6 @@ void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
>   	list_add_tail(&fence->node, &drv->fences);
>   	spin_unlock_irqrestore(&drv->lock, irq_flags);
>   
> -	trace_dma_fence_emit(&fence->f);
> -
>   	cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
>   	cmd_hdr->fence_id = cpu_to_le64(fence->fence_id);
>   
> diff --git a/include/trace/events/dma_fence.h b/include/trace/events/dma_fence.h
> index 3963e79ca7b4..eb744a6aca49 100644
> --- a/include/trace/events/dma_fence.h
> +++ b/include/trace/events/dma_fence.h
> @@ -34,13 +34,6 @@ DECLARE_EVENT_CLASS(dma_fence,
>   		  __entry->seqno)
>   );
>   
> -DEFINE_EVENT(dma_fence, dma_fence_emit,
> -
> -	TP_PROTO(struct dma_fence *fence),
> -
> -	TP_ARGS(fence)
> -);
> -
>   DEFINE_EVENT(dma_fence, dma_fence_init,
>   
>   	TP_PROTO(struct dma_fence *fence),