Re: [PATCH 1/2] dma-buf: nuke DMA_FENCE_TRACE macros v2

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Aug 18, 2021 at 12:54:42PM +0200, Christian König wrote:
> Only the DRM GPU scheduler, radeon and amdgpu where using them and they depend
> on a non existing config option to actually emit some code.
> 
> v2: keep the signal path as is for now
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 10 +---------
>  drivers/gpu/drm/radeon/radeon_fence.c     | 24 ++++-------------------
>  drivers/gpu/drm/scheduler/sched_fence.c   | 18 ++---------------
>  include/linux/dma-fence.h                 | 22 ---------------------
>  4 files changed, 7 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> index 0b1c48590c43..c65994e382bd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> @@ -246,7 +246,6 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring)
>  	struct amdgpu_fence_driver *drv = &ring->fence_drv;
>  	struct amdgpu_device *adev = ring->adev;
>  	uint32_t seq, last_seq;
> -	int r;
>  
>  	do {
>  		last_seq = atomic_read(&ring->fence_drv.last_seq);
> @@ -278,12 +277,7 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring)
>  		if (!fence)
>  			continue;
>  
> -		r = dma_fence_signal(fence);
> -		if (!r)
> -			DMA_FENCE_TRACE(fence, "signaled from irq context\n");
> -		else
> -			BUG();
> -
> +		dma_fence_signal(fence);
>  		dma_fence_put(fence);
>  		pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
>  		pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
> @@ -639,8 +633,6 @@ static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
>  	if (!timer_pending(&ring->fence_drv.fallback_timer))
>  		amdgpu_fence_schedule_fallback(ring);
>  
> -	DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
> -
>  	return true;
>  }
>  
> diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
> index 18f2c2e0dfb3..3f351d222cbb 100644
> --- a/drivers/gpu/drm/radeon/radeon_fence.c
> +++ b/drivers/gpu/drm/radeon/radeon_fence.c
> @@ -176,18 +176,11 @@ static int radeon_fence_check_signaled(wait_queue_entry_t *wait, unsigned mode,
>  	 */
>  	seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq);
>  	if (seq >= fence->seq) {
> -		int ret = dma_fence_signal_locked(&fence->base);
> -
> -		if (!ret)
> -			DMA_FENCE_TRACE(&fence->base, "signaled from irq context\n");
> -		else
> -			DMA_FENCE_TRACE(&fence->base, "was already signaled\n");
> -
> +		dma_fence_signal_locked(&fence->base);
>  		radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring);
>  		__remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake);
>  		dma_fence_put(&fence->base);
> -	} else
> -		DMA_FENCE_TRACE(&fence->base, "pending\n");
> +	}
>  	return 0;
>  }
>  
> @@ -422,8 +415,6 @@ static bool radeon_fence_enable_signaling(struct dma_fence *f)
>  	fence->fence_wake.func = radeon_fence_check_signaled;
>  	__add_wait_queue(&rdev->fence_queue, &fence->fence_wake);
>  	dma_fence_get(f);
> -
> -	DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring);
>  	return true;
>  }
>  
> @@ -441,11 +432,7 @@ bool radeon_fence_signaled(struct radeon_fence *fence)
>  		return true;
>  
>  	if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {
> -		int ret;
> -
> -		ret = dma_fence_signal(&fence->base);
> -		if (!ret)
> -			DMA_FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n");
> +		dma_fence_signal(&fence->base);
>  		return true;
>  	}
>  	return false;
> @@ -550,7 +537,6 @@ long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeo
>  {
>  	uint64_t seq[RADEON_NUM_RINGS] = {};
>  	long r;
> -	int r_sig;
>  
>  	/*
>  	 * This function should not be called on !radeon fences.
> @@ -567,9 +553,7 @@ long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeo
>  		return r;
>  	}
>  
> -	r_sig = dma_fence_signal(&fence->base);
> -	if (!r_sig)
> -		DMA_FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
> +	dma_fence_signal(&fence->base);
>  	return r;
>  }
>  
> diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c
> index 69de2c76731f..3736746c47bd 100644
> --- a/drivers/gpu/drm/scheduler/sched_fence.c
> +++ b/drivers/gpu/drm/scheduler/sched_fence.c
> @@ -50,26 +50,12 @@ static void __exit drm_sched_fence_slab_fini(void)
>  
>  void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
>  {
> -	int ret = dma_fence_signal(&fence->scheduled);
> -
> -	if (!ret)
> -		DMA_FENCE_TRACE(&fence->scheduled,
> -				"signaled from irq context\n");
> -	else
> -		DMA_FENCE_TRACE(&fence->scheduled,
> -				"was already signaled\n");
> +	dma_fence_signal(&fence->scheduled);
>  }
>  
>  void drm_sched_fence_finished(struct drm_sched_fence *fence)
>  {
> -	int ret = dma_fence_signal(&fence->finished);
> -
> -	if (!ret)
> -		DMA_FENCE_TRACE(&fence->finished,
> -				"signaled from irq context\n");
> -	else
> -		DMA_FENCE_TRACE(&fence->finished,
> -				"was already signaled\n");
> +	dma_fence_signal(&fence->finished);
>  }
>  
>  static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
> diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
> index 6ffb4b2c6371..4cc119ab272f 100644
> --- a/include/linux/dma-fence.h
> +++ b/include/linux/dma-fence.h
> @@ -590,26 +590,4 @@ struct dma_fence *dma_fence_get_stub(void);
>  struct dma_fence *dma_fence_allocate_private_stub(void);
>  u64 dma_fence_context_alloc(unsigned num);
>  
> -#define DMA_FENCE_TRACE(f, fmt, args...) \
> -	do {								\
> -		struct dma_fence *__ff = (f);				\
> -		if (IS_ENABLED(CONFIG_DMA_FENCE_TRACE))			\
> -			pr_info("f %llu#%llu: " fmt,			\
> -				__ff->context, __ff->seqno, ##args);	\
> -	} while (0)
> -
> -#define DMA_FENCE_WARN(f, fmt, args...) \
> -	do {								\
> -		struct dma_fence *__ff = (f);				\
> -		pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\
> -			 ##args);					\
> -	} while (0)
> -
> -#define DMA_FENCE_ERR(f, fmt, args...) \
> -	do {								\
> -		struct dma_fence *__ff = (f);				\
> -		pr_err("f %llu#%llu: " fmt, __ff->context, __ff->seqno,	\
> -			##args);					\
> -	} while (0)
> -
>  #endif /* __LINUX_DMA_FENCE_H */
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch