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drm/msm/gpu: make ringbuffer readonly 

[ Upstream commit 352c83fb39cae3eff95a8e1ed23006291abb6196 ]

The GPU has no business writing into the ringbuffer, let's make it
readonly to the GPU.

Fixes: 7198e6b031 ("drm/msm: add a3xx gpu support")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rob Clark 2020-08-17 09:23:09 -07:00 committed by Greg Kroah-Hartman
parent ebd9aff7b6
commit 8cbe9b7654
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/msm/msm_ringbuffer.c
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@ -27,7 +27,8 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
ring->id = id;
ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
MSM_BO_WC, gpu->aspace, &ring->bo, &ring->iova);
MSM_BO_WC | MSM_BO_GPU_READONLY, gpu->aspace, &ring->bo,
&ring->iova);
if (IS_ERR(ring->start)) {
ret = PTR_ERR(ring->start);