From cbd78a92b38da79b03133fd3d965ea2816cdade1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Sun, 13 Mar 2016 19:37:01 +0100 Subject: [PATCH 0400/1110] drm/amdgpu: cleanup amdgpu_fence_wait_empty v2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Just wait for last fence instead of waiting for the sequence manually. v2: don't use amdgpu_sched_jobs for the mask Signed-off-by: Christian König Acked-by: Alex Deucher Reviewed-by: Chunming Zhou --- drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 69 +++++++------------------------ 1 file changed, 15 insertions(+), 54 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 44eac91..d5bdd96 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -228,57 +228,6 @@ static void amdgpu_fence_fallback(unsigned long arg) } /** - * amdgpu_fence_seq_signaled - check if a fence sequence number has signaled - * - * @ring: ring the fence is associated with - * @seq: sequence number - * - * Check if the last signaled fence sequnce number is >= the requested - * sequence number (all asics). - * Returns true if the fence has signaled (current fence value - * is >= requested value) or false if it has not (current fence - * value is < the requested value. Helper function for - * amdgpu_fence_signaled(). - */ -static bool amdgpu_fence_seq_signaled(struct amdgpu_ring *ring, u64 seq) -{ - if (atomic64_read(&ring->fence_drv.last_seq) >= seq) - return true; - - /* poll new last sequence at least once */ - amdgpu_fence_process(ring); - if (atomic64_read(&ring->fence_drv.last_seq) >= seq) - return true; - - return false; -} - -/* - * amdgpu_ring_wait_seq - wait for seq of the specific ring to signal - * @ring: ring to wait on for the seq number - * @seq: seq number wait for - * - * return value: - * 0: seq signaled, and gpu not hang - * -EINVAL: some paramter is not valid - */ -static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq) -{ - BUG_ON(!ring); - if (seq > ring->fence_drv.sync_seq) - return -EINVAL; - - if (atomic64_read(&ring->fence_drv.last_seq) >= seq) - return 0; - - amdgpu_fence_schedule_fallback(ring); - wait_event(ring->fence_drv.fence_queue, - amdgpu_fence_seq_signaled(ring, seq)); - - return 0; -} - -/** * amdgpu_fence_wait_empty - wait for all fences to signal * * @adev: amdgpu device pointer @@ -286,16 +235,28 @@ static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq) * * Wait for all fences on the requested ring to signal (all asics). * Returns 0 if the fences have passed, error for all other cases. - * Caller must hold ring lock. */ int amdgpu_fence_wait_empty(struct amdgpu_ring *ring) { - uint64_t seq = ring->fence_drv.sync_seq; + uint64_t seq = ACCESS_ONCE(ring->fence_drv.sync_seq); + struct fence *fence, **ptr; + int r; if (!seq) return 0; - return amdgpu_fence_ring_wait_seq(ring, seq); + ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask]; + rcu_read_lock(); + fence = rcu_dereference(*ptr); + if (!fence || !fence_get_rcu(fence)) { + rcu_read_unlock(); + return 0; + } + rcu_read_unlock(); + + r = fence_wait(fence, false); + fence_put(fence); + return r; } /** -- 2.7.4