From 68ed3de43428def8ca0105bb53da8863ba456114 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Fri, 7 Aug 2015 15:57:21 +0200 Subject: [PATCH 0446/1050] drm/amdgpu: remove duplicate amdgpu_fence_process implementation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Looks like that somehow got missed while during porting the radeon changes. Signed-off-by: Christian König Reviewed-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 59 +------------------------------ 1 file changed, 1 insertion(+), 58 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 1097259..9841cc1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -294,65 +294,8 @@ static void amdgpu_fence_check_lockup(struct work_struct *work) */ void amdgpu_fence_process(struct amdgpu_ring *ring) { - uint64_t seq, last_seq, last_emitted; - unsigned count_loop = 0; - bool wake = false; - unsigned long irqflags; - - /* Note there is a scenario here for an infinite loop but it's - * very unlikely to happen. For it to happen, the current polling - * process need to be interrupted by another process and another - * process needs to update the last_seq btw the atomic read and - * xchg of the current process. - * - * More over for this to go in infinite loop there need to be - * continuously new fence signaled ie amdgpu_fence_read needs - * to return a different value each time for both the currently - * polling process and the other process that xchg the last_seq - * btw atomic read and xchg of the current process. And the - * value the other process set as last seq must be higher than - * the seq value we just read. Which means that current process - * need to be interrupted after amdgpu_fence_read and before - * atomic xchg. - * - * To be even more safe we count the number of time we loop and - * we bail after 10 loop just accepting the fact that we might - * have temporarly set the last_seq not to the true real last - * seq but to an older one. - */ - spin_lock_irqsave(&ring->fence_lock, irqflags); - last_seq = atomic64_read(&ring->fence_drv.last_seq); - do { - last_emitted = ring->fence_drv.sync_seq[ring->idx]; - seq = amdgpu_fence_read(ring); - seq |= last_seq & 0xffffffff00000000LL; - if (seq < last_seq) { - seq &= 0xffffffff; - seq |= last_emitted & 0xffffffff00000000LL; - } - - if (seq <= last_seq || seq > last_emitted) { - break; - } - /* If we loop over we don't want to return without - * checking if a fence is signaled as it means that the - * seq we just read is different from the previous on. - */ - wake = true; - last_seq = seq; - if ((count_loop++) > 10) { - /* We looped over too many time leave with the - * fact that we might have set an older fence - * seq then the current real last seq as signaled - * by the hw. - */ - break; - } - } while (atomic64_xchg(&ring->fence_drv.last_seq, seq) > seq); - - if (wake) + if (amdgpu_fence_activity(ring)) wake_up_all(&ring->fence_drv.fence_queue); - spin_unlock_irqrestore(&ring->fence_lock, irqflags); } /** -- 1.9.1