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Commit 1ffd2652 authored by Christian König's avatar Christian König Committed by Alex Deucher
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drm/amdgpu: fix waiting for all fences before flipping 



Otherwise we might see corruption.

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4127a59e

drivers/gpu/drm/amd/amdgpu/amdgpu.h

+3 −1
Original line number Diff line number Diff line
@@ -828,7 +828,9 @@ struct amdgpu_flip_work { 
	uint64_t			base;

	struct drm_pending_vblank_event *event;

	struct amdgpu_bo		*old_rbo;

	struct fence			*fence;

	struct fence			*excl;

	unsigned			shared_count;

	struct fence			**shared;

};

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

+53 −28
Original line number Diff line number Diff line
@@ -35,22 +35,16 @@ 
#include <drm/drm_crtc_helper.h>

#include <drm/drm_edid.h>





static void amdgpu_flip_work_func(struct work_struct *__work)

static void amdgpu_flip_wait_fence(struct amdgpu_device *adev,

				   struct fence **f)

{

	struct amdgpu_flip_work *work =

		container_of(__work, struct amdgpu_flip_work, flip_work);

	struct amdgpu_device *adev = work->adev;

	struct amdgpu_crtc *amdgpuCrtc = adev->mode_info.crtcs[work->crtc_id];



	struct drm_crtc *crtc = &amdgpuCrtc->base;

	struct amdgpu_fence *fence;

	unsigned long flags;

	int r;

	long r;



	down_read(&adev->exclusive_lock);

	if (work->fence) {

		fence = to_amdgpu_fence(work->fence);

	if (*f == NULL)

		return;



	fence = to_amdgpu_fence(*f);

	if (fence) {

		r = fence_wait(&fence->base, false);

		if (r == -EDEADLK) {
@@ -59,20 +53,35 @@ static void amdgpu_flip_work_func(struct work_struct *__work) 
			down_read(&adev->exclusive_lock);

		}

	} else

			r = fence_wait(work->fence, false);

		r = fence_wait(*f, false);



	if (r)

			DRM_ERROR("failed to wait on page flip fence (%d)!\n", r);

		DRM_ERROR("failed to wait on page flip fence (%ld)!\n", r);



	/* We continue with the page flip even if we failed to wait on

	 * the fence, otherwise the DRM core and userspace will be

	 * confused about which BO the CRTC is scanning out

	 */



		fence_put(work->fence);

		work->fence = NULL;

	fence_put(*f);

	*f = NULL;

}



static void amdgpu_flip_work_func(struct work_struct *__work)

{

	struct amdgpu_flip_work *work =

		container_of(__work, struct amdgpu_flip_work, flip_work);

	struct amdgpu_device *adev = work->adev;

	struct amdgpu_crtc *amdgpuCrtc = adev->mode_info.crtcs[work->crtc_id];



	struct drm_crtc *crtc = &amdgpuCrtc->base;

	unsigned long flags;

	unsigned i;



	down_read(&adev->exclusive_lock);

	amdgpu_flip_wait_fence(adev, &work->excl);

	for (i = 0; i < work->shared_count; ++i)

		amdgpu_flip_wait_fence(adev, &work->shared[i]);



	/* We borrow the event spin lock for protecting flip_status */

	spin_lock_irqsave(&crtc->dev->event_lock, flags);
@@ -108,6 +117,7 @@ static void amdgpu_unpin_work_func(struct work_struct *__work) 
		DRM_ERROR("failed to reserve buffer after flip\n");



	drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);

	kfree(work->shared);

	kfree(work);

}
@@ -127,7 +137,7 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, 
	unsigned long flags;

	u64 tiling_flags;

	u64 base;

	int r;

	int i, r;



	work = kzalloc(sizeof *work, GFP_KERNEL);

	if (work == NULL)
@@ -167,7 +177,19 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, 
		goto cleanup;

	}



	work->fence = fence_get(reservation_object_get_excl(new_rbo->tbo.resv));

	r = reservation_object_get_fences_rcu(new_rbo->tbo.resv, &work->excl,

					      &work->shared_count,

					      &work->shared);

	if (unlikely(r != 0)) {

		amdgpu_bo_unreserve(new_rbo);

		DRM_ERROR("failed to get fences for buffer\n");

		goto cleanup;

	}



	fence_get(work->excl);

	for (i = 0; i < work->shared_count; ++i)

		fence_get(work->shared[i]);



	amdgpu_bo_get_tiling_flags(new_rbo, &tiling_flags);

	amdgpu_bo_unreserve(new_rbo);
@@ -212,7 +234,10 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, 


cleanup:

	drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);

	fence_put(work->fence);

	fence_put(work->excl);

	for (i = 0; i < work->shared_count; ++i)

		fence_put(work->shared[i]);

	kfree(work->shared);

	kfree(work);



	return r;