From 04e4e2e9558326316cf3e32d46cca83cc3861ef0 Mon Sep 17 00:00:00 2001 From: Yintian Tao Date: Thu, 23 Apr 2020 12:05:54 +0800 Subject: drm/amdgpu: protect ring overrun MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Wait for the oldest sequence on the ring to be signaled in order to make sure there will be no command overrun. v2: fix coding stype and remove abs operation v3: remove the initialization of variable r Signed-off-by: Yintian Tao Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 7531527067df..d878fe7fee51 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -192,14 +192,22 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, * Used For polling fence. * Returns 0 on success, -ENOMEM on failure. */ -int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s) +int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s, + uint32_t timeout) { uint32_t seq; + signed long r; if (!s) return -EINVAL; seq = ++ring->fence_drv.sync_seq; + r = amdgpu_fence_wait_polling(ring, + seq - ring->fence_drv.num_fences_mask, + timeout); + if (r < 1) + return -ETIMEDOUT; + amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr, seq, 0); -- cgit