Commit 7601d53c authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/panfrost: Fix implicit sync 



Currently this has no practial relevance I think because there's not
many who can pull off a setup with panfrost and another gpu in the
same system. But the rules are that if you're setting an exclusive
fence, indicating a gpu write access in the implicit fencing system,
then you need to wait for all fences, not just the previous exclusive
fence.

panfrost against itself has no problem, because it always sets the
exclusive fence (but that's probably something that will need to be
fixed for vulkan and/or multi-engine gpus, or you'll suffer badly).
Also no problem with that against display.

With the prep work done to switch over to the dependency helpers this
is now a oneliner.

Reviewed-by: default avatarBoris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622165511.3169559-7-daniel.vetter@ffwll.ch
parent 7d7a0fc4

drivers/gpu/drm/panfrost/panfrost_job.c

+2 −3
Original line number Diff line number Diff line
@@ -203,9 +203,8 @@ static int panfrost_acquire_object_fences(struct drm_gem_object **bos, 
	int i, ret;



	for (i = 0; i < bo_count; i++) {

		struct dma_fence *fence = dma_resv_get_excl_unlocked(bos[i]->resv);



		ret = drm_gem_fence_array_add(deps, fence);

		/* panfrost always uses write mode in its current uapi */

		ret = drm_gem_fence_array_add_implicit(deps, bos[i], true);

		if (ret)

			return ret;

	}