Re: [PATCH 03/16] dma-buf: specify usage while adding fences to dma_resv obj v6

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On Wed, Apr 06, 2022 at 09:51:19AM +0200, Christian König wrote:
> Instead of distingting between shared and exclusive fences specify
> the fence usage while adding fences.
> 
> Rework all drivers to use this interface instead and deprecate the old one.
> 
> v2: some kerneldoc comments suggested by Daniel
> v3: fix a missing case in radeon
> v4: rebase on nouveau changes, fix lockdep and temporary disable warning
> v5: more documentation updates
> v6: separate internal dma_resv changes from this patch, avoids to
>     disable warning temporary, rebase on upstream changes
> 
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
>  drivers/dma-buf/dma-resv.c                    |  48 +++++++--
>  drivers/dma-buf/st-dma-resv.c                 | 101 +++++-------------
>  .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  |   2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        |   4 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    |   6 +-
>  drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c  |  10 +-
>  drivers/gpu/drm/i915/gem/i915_gem_busy.c      |  13 +--
>  drivers/gpu/drm/i915/gem/i915_gem_clflush.c   |   3 +-
>  drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c  |   5 +-
>  .../drm/i915/gem/selftests/i915_gem_migrate.c |   4 +-
>  .../drm/i915/gem/selftests/i915_gem_mman.c    |   3 +-
>  drivers/gpu/drm/i915/i915_vma.c               |   8 +-
>  .../drm/i915/selftests/intel_memory_region.c  |   3 +-
>  drivers/gpu/drm/lima/lima_gem.c               |   2 +-
>  drivers/gpu/drm/msm/msm_gem_submit.c          |   6 +-
>  drivers/gpu/drm/nouveau/nouveau_bo.c          |   9 +-
>  drivers/gpu/drm/nouveau/nouveau_fence.c       |   4 +-
>  drivers/gpu/drm/panfrost/panfrost_job.c       |   2 +-
>  drivers/gpu/drm/qxl/qxl_release.c             |   3 +-
>  drivers/gpu/drm/radeon/radeon_object.c        |   6 +-
>  drivers/gpu/drm/ttm/ttm_bo.c                  |   2 +-
>  drivers/gpu/drm/ttm/ttm_bo_util.c             |   5 +-
>  drivers/gpu/drm/ttm/ttm_execbuf_util.c        |   6 +-
>  drivers/gpu/drm/v3d/v3d_gem.c                 |   4 +-
>  drivers/gpu/drm/vc4/vc4_gem.c                 |   2 +-
>  drivers/gpu/drm/vgem/vgem_fence.c             |   9 +-
>  drivers/gpu/drm/virtio/virtgpu_gem.c          |   3 +-
>  drivers/gpu/drm/vmwgfx/vmwgfx_bo.c            |   3 +-
>  include/linux/dma-buf.h                       |  16 +--
>  include/linux/dma-resv.h                      |  25 +++--
>  30 files changed, 151 insertions(+), 166 deletions(-)
> 
> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
> index 17237e6ee30c..543dae6566d2 100644
> --- a/drivers/dma-buf/dma-resv.c
> +++ b/drivers/dma-buf/dma-resv.c
> @@ -234,14 +234,14 @@ EXPORT_SYMBOL(dma_resv_reserve_fences);
>  
>  #ifdef CONFIG_DEBUG_MUTEXES
>  /**
> - * dma_resv_reset_shared_max - reset shared fences for debugging
> + * dma_resv_reset_max_fences - reset shared fences for debugging
>   * @obj: the dma_resv object to reset
>   *
>   * Reset the number of pre-reserved shared slots to test that drivers do
>   * correct slot allocation using dma_resv_reserve_fences(). See also
>   * &dma_resv_list.shared_max.
>   */
> -void dma_resv_reset_shared_max(struct dma_resv *obj)
> +void dma_resv_reset_max_fences(struct dma_resv *obj)
>  {
>  	struct dma_resv_list *fences = dma_resv_shared_list(obj);
>  
> @@ -251,7 +251,7 @@ void dma_resv_reset_shared_max(struct dma_resv *obj)
>  	if (fences)
>  		fences->shared_max = fences->shared_count;
>  }
> -EXPORT_SYMBOL(dma_resv_reset_shared_max);
> +EXPORT_SYMBOL(dma_resv_reset_max_fences);
>  #endif
>  
>  /**
> @@ -264,7 +264,8 @@ EXPORT_SYMBOL(dma_resv_reset_shared_max);
>   *
>   * See also &dma_resv.fence for a discussion of the semantics.
>   */
> -void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
> +static void dma_resv_add_shared_fence(struct dma_resv *obj,
> +				      struct dma_fence *fence)
>  {
>  	struct dma_resv_list *fobj;
>  	struct dma_fence *old;
> @@ -305,13 +306,13 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
>  	write_seqcount_end(&obj->seq);
>  	dma_fence_put(old);
>  }
> -EXPORT_SYMBOL(dma_resv_add_shared_fence);
>  
>  /**
>   * dma_resv_replace_fences - replace fences in the dma_resv obj
>   * @obj: the reservation object
>   * @context: the context of the fences to replace
>   * @replacement: the new fence to use instead
> + * @usage: how the new fence is used, see enum dma_resv_usage
>   *
>   * Replace fences with a specified context with a new fence. Only valid if the
>   * operation represented by the original fence has no longer access to the
> @@ -321,12 +322,16 @@ EXPORT_SYMBOL(dma_resv_add_shared_fence);
>   * update fence which makes the resource inaccessible.
>   */
>  void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context,
> -			     struct dma_fence *replacement)
> +			     struct dma_fence *replacement,
> +			     enum dma_resv_usage usage)
>  {
>  	struct dma_resv_list *list;
>  	struct dma_fence *old;
>  	unsigned int i;
>  
> +	/* Only readers supported for now */
> +	WARN_ON(usage != DMA_RESV_USAGE_READ);
> +
>  	dma_resv_assert_held(obj);
>  
>  	write_seqcount_begin(&obj->seq);
> @@ -360,7 +365,8 @@ EXPORT_SYMBOL(dma_resv_replace_fences);
>   * Add a fence to the exclusive slot. @obj must be locked with dma_resv_lock().
>   * See also &dma_resv.fence_excl for a discussion of the semantics.
>   */
> -void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
> +static void dma_resv_add_excl_fence(struct dma_resv *obj,
> +				    struct dma_fence *fence)
>  {
>  	struct dma_fence *old_fence = dma_resv_excl_fence(obj);
>  
> @@ -375,7 +381,27 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
>  
>  	dma_fence_put(old_fence);
>  }
> -EXPORT_SYMBOL(dma_resv_add_excl_fence);
> +
> +/**
> + * dma_resv_add_fence - Add a fence to the dma_resv obj
> + * @obj: the reservation object
> + * @fence: the fence to add
> + * @usage: how the fence is used, see enum dma_resv_usage
> + *
> + * Add a fence to a slot, @obj must be locked with dma_resv_lock(), and
> + * dma_resv_reserve_fences() has been called.
> + *
> + * See also &dma_resv.fence for a discussion of the semantics.
> + */
> +void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
> +			enum dma_resv_usage usage)
> +{
> +	if (usage == DMA_RESV_USAGE_WRITE)
> +		dma_resv_add_excl_fence(obj, fence);
> +	else
> +		dma_resv_add_shared_fence(obj, fence);
> +}
> +EXPORT_SYMBOL(dma_resv_add_fence);
>  
>  /* Restart the iterator by initializing all the necessary fields, but not the
>   * relation to the dma_resv object. */
> @@ -574,7 +600,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
>  		}
>  
>  		dma_fence_get(f);
> -		if (dma_resv_iter_is_exclusive(&cursor))
> +		if (dma_resv_iter_usage(&cursor) == DMA_RESV_USAGE_WRITE)
>  			excl = f;
>  		else
>  			RCU_INIT_POINTER(list->shared[list->shared_count++], f);
> @@ -771,13 +797,13 @@ EXPORT_SYMBOL_GPL(dma_resv_test_signaled);
>   */
>  void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq)
>  {
> +	static const char *usage[] = { "write", "read" };
>  	struct dma_resv_iter cursor;
>  	struct dma_fence *fence;
>  
>  	dma_resv_for_each_fence(&cursor, obj, DMA_RESV_USAGE_READ, fence) {
>  		seq_printf(seq, "\t%s fence:",
> -			   dma_resv_iter_is_exclusive(&cursor) ?
> -				"Exclusive" : "Shared");
> +			   usage[dma_resv_iter_usage(&cursor)]);
>  		dma_fence_describe(fence, seq);
>  	}
>  }
> diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
> index d097981061b1..d0f7c2bfd4f0 100644
> --- a/drivers/dma-buf/st-dma-resv.c
> +++ b/drivers/dma-buf/st-dma-resv.c
> @@ -58,8 +58,9 @@ static int sanitycheck(void *arg)
>  	return r;
>  }
>  
> -static int test_signaling(void *arg, enum dma_resv_usage usage)
> +static int test_signaling(void *arg)
>  {
> +	enum dma_resv_usage usage = (unsigned long)arg;
>  	struct dma_resv resv;
>  	struct dma_fence *f;
>  	int r;
> @@ -81,11 +82,7 @@ static int test_signaling(void *arg, enum dma_resv_usage usage)
>  		goto err_unlock;
>  	}
>  
> -	if (usage >= DMA_RESV_USAGE_READ)
> -		dma_resv_add_shared_fence(&resv, f);
> -	else
> -		dma_resv_add_excl_fence(&resv, f);
> -
> +	dma_resv_add_fence(&resv, f, usage);
>  	if (dma_resv_test_signaled(&resv, usage)) {
>  		pr_err("Resv unexpectedly signaled\n");
>  		r = -EINVAL;
> @@ -105,18 +102,9 @@ static int test_signaling(void *arg, enum dma_resv_usage usage)
>  	return r;
>  }
>  
> -static int test_excl_signaling(void *arg)
> -{
> -	return test_signaling(arg, DMA_RESV_USAGE_WRITE);
> -}
> -
> -static int test_shared_signaling(void *arg)
> -{
> -	return test_signaling(arg, DMA_RESV_USAGE_READ);
> -}
> -
> -static int test_for_each(void *arg, enum dma_resv_usage usage)
> +static int test_for_each(void *arg)
>  {
> +	enum dma_resv_usage usage = (unsigned long)arg;
>  	struct dma_resv_iter cursor;
>  	struct dma_fence *f, *fence;
>  	struct dma_resv resv;
> @@ -139,10 +127,7 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
>  		goto err_unlock;
>  	}
>  
> -	if (usage >= DMA_RESV_USAGE_READ)
> -		dma_resv_add_shared_fence(&resv, f);
> -	else
> -		dma_resv_add_excl_fence(&resv, f);
> +	dma_resv_add_fence(&resv, f, usage);
>  
>  	r = -ENOENT;
>  	dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
> @@ -156,8 +141,7 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
>  			r = -EINVAL;
>  			goto err_unlock;
>  		}
> -		if (dma_resv_iter_is_exclusive(&cursor) !=
> -		    (usage >= DMA_RESV_USAGE_READ)) {
> +		if (dma_resv_iter_usage(&cursor) != usage) {
>  			pr_err("Unexpected fence usage\n");
>  			r = -EINVAL;
>  			goto err_unlock;
> @@ -177,18 +161,9 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
>  	return r;
>  }
>  
> -static int test_excl_for_each(void *arg)
> -{
> -	return test_for_each(arg, DMA_RESV_USAGE_WRITE);
> -}
> -
> -static int test_shared_for_each(void *arg)
> -{
> -	return test_for_each(arg, DMA_RESV_USAGE_READ);
> -}
> -
> -static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
> +static int test_for_each_unlocked(void *arg)
>  {
> +	enum dma_resv_usage usage = (unsigned long)arg;
>  	struct dma_resv_iter cursor;
>  	struct dma_fence *f, *fence;
>  	struct dma_resv resv;
> @@ -212,10 +187,7 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
>  		goto err_free;
>  	}
>  
> -	if (usage >= DMA_RESV_USAGE_READ)
> -		dma_resv_add_shared_fence(&resv, f);
> -	else
> -		dma_resv_add_excl_fence(&resv, f);
> +	dma_resv_add_fence(&resv, f, usage);
>  	dma_resv_unlock(&resv);
>  
>  	r = -ENOENT;
> @@ -235,8 +207,7 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
>  			r = -EINVAL;
>  			goto err_iter_end;
>  		}
> -		if (dma_resv_iter_is_exclusive(&cursor) !=
> -		    (usage >= DMA_RESV_USAGE_READ)) {
> +		if (dma_resv_iter_usage(&cursor) != usage) {
>  			pr_err("Unexpected fence usage\n");
>  			r = -EINVAL;
>  			goto err_iter_end;
> @@ -262,18 +233,9 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
>  	return r;
>  }
>  
> -static int test_excl_for_each_unlocked(void *arg)
> -{
> -	return test_for_each_unlocked(arg, DMA_RESV_USAGE_WRITE);
> -}
> -
> -static int test_shared_for_each_unlocked(void *arg)
> -{
> -	return test_for_each_unlocked(arg, DMA_RESV_USAGE_READ);
> -}
> -
> -static int test_get_fences(void *arg, enum dma_resv_usage usage)
> +static int test_get_fences(void *arg)
>  {
> +	enum dma_resv_usage usage = (unsigned long)arg;
>  	struct dma_fence *f, **fences = NULL;
>  	struct dma_resv resv;
>  	int r, i;
> @@ -296,10 +258,7 @@ static int test_get_fences(void *arg, enum dma_resv_usage usage)
>  		goto err_resv;
>  	}
>  
> -	if (usage >= DMA_RESV_USAGE_READ)
> -		dma_resv_add_shared_fence(&resv, f);
> -	else
> -		dma_resv_add_excl_fence(&resv, f);
> +	dma_resv_add_fence(&resv, f, usage);
>  	dma_resv_unlock(&resv);
>  
>  	r = dma_resv_get_fences(&resv, usage, &i, &fences);
> @@ -324,30 +283,24 @@ static int test_get_fences(void *arg, enum dma_resv_usage usage)
>  	return r;
>  }
>  
> -static int test_excl_get_fences(void *arg)
> -{
> -	return test_get_fences(arg, DMA_RESV_USAGE_WRITE);
> -}
> -
> -static int test_shared_get_fences(void *arg)
> -{
> -	return test_get_fences(arg, DMA_RESV_USAGE_READ);
> -}
> -
>  int dma_resv(void)
>  {
>  	static const struct subtest tests[] = {
>  		SUBTEST(sanitycheck),
> -		SUBTEST(test_excl_signaling),
> -		SUBTEST(test_shared_signaling),
> -		SUBTEST(test_excl_for_each),
> -		SUBTEST(test_shared_for_each),
> -		SUBTEST(test_excl_for_each_unlocked),
> -		SUBTEST(test_shared_for_each_unlocked),
> -		SUBTEST(test_excl_get_fences),
> -		SUBTEST(test_shared_get_fences),
> +		SUBTEST(test_signaling),
> +		SUBTEST(test_for_each),
> +		SUBTEST(test_for_each_unlocked),
> +		SUBTEST(test_get_fences),
>  	};
> +	enum dma_resv_usage usage;
> +	int r;
>  
>  	spin_lock_init(&fence_lock);
> -	return subtests(tests, NULL);
> +	for (usage = DMA_RESV_USAGE_WRITE; usage <= DMA_RESV_USAGE_READ;
> +	     ++usage) {
> +		r = subtests(tests, (void *)(unsigned long)usage);
> +		if (r)
> +			return r;
> +	}
> +	return 0;
>  }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 98b1736bb221..5031e26e6716 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -263,7 +263,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
>  	 */
>  	replacement = dma_fence_get_stub();
>  	dma_resv_replace_fences(bo->tbo.base.resv, ef->base.context,
> -				replacement);
> +				replacement, DMA_RESV_USAGE_READ);
>  	dma_fence_put(replacement);
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index 413f32c3fd63..76fd916424d6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -55,8 +55,8 @@ static int amdgpu_cs_user_fence_chunk(struct amdgpu_cs_parser *p,
>  	bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
>  	p->uf_entry.priority = 0;
>  	p->uf_entry.tv.bo = &bo->tbo;
> -	/* One for TTM and one for the CS job */
> -	p->uf_entry.tv.num_shared = 2;
> +	/* One for TTM and two for the CS job */
> +	p->uf_entry.tv.num_shared = 3;
>  
>  	drm_gem_object_put(gobj);
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index a7f39f8ab7be..a3cdf8a24377 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1397,10 +1397,8 @@ void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
>  		return;
>  	}
>  
> -	if (shared)
> -		dma_resv_add_shared_fence(resv, fence);
> -	else
> -		dma_resv_add_excl_fence(resv, fence);
> +	dma_resv_add_fence(resv, fence, shared ? DMA_RESV_USAGE_READ :
> +			   DMA_RESV_USAGE_WRITE);
>  }
>  
>  /**
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> index 53f7c78628a4..98bb5c9239de 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> @@ -202,14 +202,10 @@ static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)
>  
>  	for (i = 0; i < submit->nr_bos; i++) {
>  		struct drm_gem_object *obj = &submit->bos[i].obj->base;
> +		bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
>  
> -		if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
> -			dma_resv_add_excl_fence(obj->resv,
> -							  submit->out_fence);
> -		else
> -			dma_resv_add_shared_fence(obj->resv,
> -							    submit->out_fence);
> -
> +		dma_resv_add_fence(obj->resv, submit->out_fence, write ?
> +				   DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);

Iirc I had some suggestions to use dma_resv_usage_rw here and above. Do
these happen in later patches? There's also a few more of these later on.

>  		submit_unlock_object(submit, i);
>  	}
>  }
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
> index 14a1c0ad8c3c..e7ae94ee1b44 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
> @@ -148,12 +148,13 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
>  		if (dma_resv_iter_is_restarted(&cursor))
>  			args->busy = 0;
>  
> -		if (dma_resv_iter_is_exclusive(&cursor))
> -			/* Translate the exclusive fence to the READ *and* WRITE engine */
> -			args->busy |= busy_check_writer(fence);
> -		else
> -			/* Translate shared fences to READ set of engines */
> -			args->busy |= busy_check_reader(fence);
> +		/* Translate read fences to READ set of engines */
> +		args->busy |= busy_check_reader(fence);
> +	}
> +	dma_resv_iter_begin(&cursor, obj->base.resv, DMA_RESV_USAGE_WRITE);
> +	dma_resv_for_each_fence_unlocked(&cursor, fence) {

Two loops is a bit much but also meh.

> +		/* Translate the write fences to the READ *and* WRITE engine */
> +		args->busy |= busy_check_writer(fence);
>  	}
>  	dma_resv_iter_end(&cursor);
>  
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
> index 1fd0cc9ca213..f5f2b8b115ea 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
> @@ -116,7 +116,8 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj,
>  						obj->base.resv, NULL, true,
>  						i915_fence_timeout(i915),
>  						I915_FENCE_GFP);
> -		dma_resv_add_excl_fence(obj->base.resv, &clflush->base.dma);
> +		dma_resv_add_fence(obj->base.resv, &clflush->base.dma,
> +				   DMA_RESV_USAGE_WRITE);
>  		dma_fence_work_commit(&clflush->base);
>  		/*
>  		 * We must have successfully populated the pages(since we are
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> index 432ac74ff225..438b8a95b3d1 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> @@ -637,9 +637,8 @@ int i915_gem_obj_copy_ttm(struct drm_i915_gem_object *dst,
>  	if (IS_ERR_OR_NULL(copy_fence))
>  		return PTR_ERR_OR_ZERO(copy_fence);
>  
> -	dma_resv_add_excl_fence(dst_bo->base.resv, copy_fence);
> -	dma_resv_add_shared_fence(src_bo->base.resv, copy_fence);
> -
> +	dma_resv_add_fence(dst_bo->base.resv, copy_fence, DMA_RESV_USAGE_WRITE);
> +	dma_resv_add_fence(src_bo->base.resv, copy_fence, DMA_RESV_USAGE_READ);
>  	dma_fence_put(copy_fence);
>  
>  	return 0;
> diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
> index 0e52eb87cd55..4997ed18b6e4 100644
> --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
> +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
> @@ -218,8 +218,8 @@ static int __igt_lmem_pages_migrate(struct intel_gt *gt,
>  		if (rq) {
>  			err = dma_resv_reserve_fences(obj->base.resv, 1);
>  			if (!err)
> -				dma_resv_add_excl_fence(obj->base.resv,
> -							&rq->fence);
> +				dma_resv_add_fence(obj->base.resv, &rq->fence,
> +						   DMA_RESV_USAGE_WRITE);
>  			i915_gem_object_set_moving_fence(obj, &rq->fence);
>  			i915_request_put(rq);
>  		}
> diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
> index a132e241c3ee..3a6e3f6d239f 100644
> --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
> +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
> @@ -1220,7 +1220,8 @@ static int __igt_mmap_migrate(struct intel_memory_region **placements,
>  					  expand32(POISON_INUSE), &rq);
>  	i915_gem_object_unpin_pages(obj);
>  	if (rq) {
> -		dma_resv_add_excl_fence(obj->base.resv, &rq->fence);
> +		dma_resv_add_fence(obj->base.resv, &rq->fence,
> +				   DMA_RESV_USAGE_WRITE);
>  		i915_gem_object_set_moving_fence(obj, &rq->fence);
>  		i915_request_put(rq);
>  	}
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index bae3423f58e8..524477d8939e 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -1826,7 +1826,8 @@ int _i915_vma_move_to_active(struct i915_vma *vma,
>  		}
>  
>  		if (fence) {
> -			dma_resv_add_excl_fence(vma->obj->base.resv, fence);
> +			dma_resv_add_fence(vma->obj->base.resv, fence,
> +					   DMA_RESV_USAGE_WRITE);
>  			obj->write_domain = I915_GEM_DOMAIN_RENDER;
>  			obj->read_domains = 0;
>  		}
> @@ -1838,7 +1839,8 @@ int _i915_vma_move_to_active(struct i915_vma *vma,
>  		}
>  
>  		if (fence) {
> -			dma_resv_add_shared_fence(vma->obj->base.resv, fence);
> +			dma_resv_add_fence(vma->obj->base.resv, fence,
> +					   DMA_RESV_USAGE_READ);
>  			obj->write_domain = 0;
>  		}
>  	}
> @@ -2078,7 +2080,7 @@ int i915_vma_unbind_async(struct i915_vma *vma, bool trylock_vm)
>  		goto out_rpm;
>  	}
>  
> -	dma_resv_add_shared_fence(obj->base.resv, fence);
> +	dma_resv_add_fence(obj->base.resv, fence, DMA_RESV_USAGE_READ);
>  	dma_fence_put(fence);
>  
>  out_rpm:
> diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> index 6114e013092b..73eb53edb8de 100644
> --- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> +++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> @@ -1056,7 +1056,8 @@ static int igt_lmem_write_cpu(void *arg)
>  					  obj->mm.pages->sgl, I915_CACHE_NONE,
>  					  true, 0xdeadbeaf, &rq);
>  	if (rq) {
> -		dma_resv_add_excl_fence(obj->base.resv, &rq->fence);
> +		dma_resv_add_fence(obj->base.resv, &rq->fence,
> +				   DMA_RESV_USAGE_WRITE);
>  		i915_request_put(rq);
>  	}
>  
> diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
> index e0a11ee0e86d..cb3bfccc930f 100644
> --- a/drivers/gpu/drm/lima/lima_gem.c
> +++ b/drivers/gpu/drm/lima/lima_gem.c
> @@ -367,7 +367,7 @@ int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
>  		if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
>  			dma_resv_add_excl_fence(lima_bo_resv(bos[i]), fence);
>  		else
> -			dma_resv_add_shared_fence(lima_bo_resv(bos[i]), fence);
> +			dma_resv_add_fence(lima_bo_resv(bos[i]), fence);
>  	}
>  
>  	drm_gem_unlock_reservations((struct drm_gem_object **)bos,
> diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
> index 3164db8be893..8d1eef914ba8 100644
> --- a/drivers/gpu/drm/msm/msm_gem_submit.c
> +++ b/drivers/gpu/drm/msm/msm_gem_submit.c
> @@ -395,9 +395,11 @@ static void submit_attach_object_fences(struct msm_gem_submit *submit)
>  		struct drm_gem_object *obj = &submit->bos[i].obj->base;
>  
>  		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
> -			dma_resv_add_excl_fence(obj->resv, submit->user_fence);
> +			dma_resv_add_fence(obj->resv, submit->user_fence,
> +					   DMA_RESV_USAGE_WRITE);
>  		else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
> -			dma_resv_add_shared_fence(obj->resv, submit->user_fence);
> +			dma_resv_add_fence(obj->resv, submit->user_fence,
> +					   DMA_RESV_USAGE_READ);
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index c6bb4dbcd735..05076e530e7d 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1308,10 +1308,11 @@ nouveau_bo_fence(struct nouveau_bo *nvbo, struct nouveau_fence *fence, bool excl
>  {
>  	struct dma_resv *resv = nvbo->bo.base.resv;
>  
> -	if (exclusive)
> -		dma_resv_add_excl_fence(resv, &fence->base);
> -	else if (fence)
> -		dma_resv_add_shared_fence(resv, &fence->base);
> +	if (!fence)
> +		return;
> +
> +	dma_resv_add_fence(resv, &fence->base, exclusive ?
> +			   DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
>  }
>  
>  static void
> diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
> index d5e81ccee01c..7f01dcf81fab 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_fence.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
> @@ -360,9 +360,11 @@ nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan,
>  		dma_resv_for_each_fence(&cursor, resv,
>  					dma_resv_usage_rw(exclusive),
>  					fence) {
> +			enum dma_resv_usage usage;
>  			struct nouveau_fence *f;
>  
> -			if (i == 0 && dma_resv_iter_is_exclusive(&cursor))
> +			usage = dma_resv_iter_usage(&cursor);
> +			if (i == 0 && usage == DMA_RESV_USAGE_WRITE)
>  				continue;
>  
>  			f = nouveau_local_fence(fence, chan->drm);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index c34114560e49..fda5871aebe3 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -268,7 +268,7 @@ static void panfrost_attach_object_fences(struct drm_gem_object **bos,
>  	int i;
>  
>  	for (i = 0; i < bo_count; i++)
> -		dma_resv_add_excl_fence(bos[i]->resv, fence);
> +		dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE);
>  }
>  
>  int panfrost_job_push(struct panfrost_job *job)
> diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
> index cde1e8ddaeaa..368d26da0d6a 100644
> --- a/drivers/gpu/drm/qxl/qxl_release.c
> +++ b/drivers/gpu/drm/qxl/qxl_release.c
> @@ -429,7 +429,8 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
>  	list_for_each_entry(entry, &release->bos, head) {
>  		bo = entry->bo;
>  
> -		dma_resv_add_shared_fence(bo->base.resv, &release->base);
> +		dma_resv_add_fence(bo->base.resv, &release->base,
> +				   DMA_RESV_USAGE_READ);
>  		ttm_bo_move_to_lru_tail_unlocked(bo);
>  		dma_resv_unlock(bo->base.resv);
>  	}
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index 7ffd2e90f325..cb5c4aa45cef 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -791,8 +791,6 @@ void radeon_bo_fence(struct radeon_bo *bo, struct radeon_fence *fence,
>  		return;
>  	}
>  
> -	if (shared)
> -		dma_resv_add_shared_fence(resv, &fence->base);
> -	else
> -		dma_resv_add_excl_fence(resv, &fence->base);
> +	dma_resv_add_fence(resv, &fence->base, shared ?
> +			   DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE);
>  }
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index cff05b62f3f7..d74f9eea855e 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -739,7 +739,7 @@ static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
>  		return ret;
>  	}
>  
> -	dma_resv_add_shared_fence(bo->base.resv, fence);
> +	dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE);
>  
>  	ret = dma_resv_reserve_fences(bo->base.resv, 1);
>  	if (unlikely(ret)) {
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index 1b96b91bf81b..7a96a1db13a7 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -507,7 +507,8 @@ static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo,
>  	if (ret)
>  		return ret;
>  
> -	dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
> +	dma_resv_add_fence(&ghost_obj->base._resv, fence,
> +			   DMA_RESV_USAGE_WRITE);
>  
>  	/**
>  	 * If we're not moving to fixed memory, the TTM object
> @@ -561,7 +562,7 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
>  	struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
>  	int ret = 0;
>  
> -	dma_resv_add_excl_fence(bo->base.resv, fence);
> +	dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE);
>  	if (!evict)
>  		ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt);
>  	else if (!from->use_tt && pipeline)
> diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> index 789c645f004e..0eb995d25df1 100644
> --- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> @@ -154,10 +154,8 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
>  	list_for_each_entry(entry, list, head) {
>  		struct ttm_buffer_object *bo = entry->bo;
>  
> -		if (entry->num_shared)
> -			dma_resv_add_shared_fence(bo->base.resv, fence);
> -		else
> -			dma_resv_add_excl_fence(bo->base.resv, fence);
> +		dma_resv_add_fence(bo->base.resv, fence, entry->num_shared ?
> +				   DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE);
>  		ttm_bo_move_to_lru_tail_unlocked(bo);
>  		dma_resv_unlock(bo->base.resv);
>  	}
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> index 961812d33827..2352e9640922 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -550,8 +550,8 @@ v3d_attach_fences_and_unlock_reservation(struct drm_file *file_priv,
>  
>  	for (i = 0; i < job->bo_count; i++) {
>  		/* XXX: Use shared fences for read-only objects. */
> -		dma_resv_add_excl_fence(job->bo[i]->resv,
> -					job->done_fence);
> +		dma_resv_add_fence(job->bo[i]->resv, job->done_fence,
> +				   DMA_RESV_USAGE_WRITE);
>  	}
>  
>  	drm_gem_unlock_reservations(job->bo, job->bo_count, acquire_ctx);
> diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
> index 594bd6bb00d2..38550317e025 100644
> --- a/drivers/gpu/drm/vc4/vc4_gem.c
> +++ b/drivers/gpu/drm/vc4/vc4_gem.c
> @@ -546,7 +546,7 @@ vc4_update_bo_seqnos(struct vc4_exec_info *exec, uint64_t seqno)
>  		bo = to_vc4_bo(&exec->bo[i]->base);
>  		bo->seqno = seqno;
>  
> -		dma_resv_add_shared_fence(bo->base.base.resv, exec->fence);
> +		dma_resv_add_fence(bo->base.base.resv, exec->fence);
>  	}
>  
>  	list_for_each_entry(bo, &exec->unref_list, unref_head) {
> diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
> index 91fc4940c65a..c2a879734d40 100644
> --- a/drivers/gpu/drm/vgem/vgem_fence.c
> +++ b/drivers/gpu/drm/vgem/vgem_fence.c
> @@ -161,12 +161,9 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
>  	/* Expose the fence via the dma-buf */
>  	dma_resv_lock(resv, NULL);
>  	ret = dma_resv_reserve_fences(resv, 1);
> -	if (!ret) {
> -		if (arg->flags & VGEM_FENCE_WRITE)
> -			dma_resv_add_excl_fence(resv, fence);
> -		else
> -			dma_resv_add_shared_fence(resv, fence);
> -	}
> +	if (!ret)
> +		dma_resv_add_fence(resv, fence, arg->flags & VGEM_FENCE_WRITE ?
> +				   DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
>  	dma_resv_unlock(resv);
>  
>  	/* Record the fence in our idr for later signaling */
> diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
> index 1820ca6cf673..580a78809836 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_gem.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
> @@ -250,7 +250,8 @@ void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
>  	int i;
>  
>  	for (i = 0; i < objs->nents; i++)
> -		dma_resv_add_excl_fence(objs->objs[i]->resv, fence);
> +		dma_resv_add_fence(objs->objs[i]->resv, fence,
> +				   DMA_RESV_USAGE_WRITE);
>  }
>  
>  void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> index b96884f7d03d..bec50223efe5 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> @@ -758,7 +758,8 @@ void vmw_bo_fence_single(struct ttm_buffer_object *bo,
>  
>  	ret = dma_resv_reserve_fences(bo->base.resv, 1);
>  	if (!ret)
> -		dma_resv_add_excl_fence(bo->base.resv, &fence->base);
> +		dma_resv_add_fence(bo->base.resv, &fence->base,
> +				   DMA_RESV_USAGE_WRITE);
>  	else
>  		/* Last resort fallback when we are OOM */
>  		dma_fence_wait(&fence->base, false);
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index a297397743a2..71731796c8c3 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -393,15 +393,15 @@ struct dma_buf {
>  	 * e.g. exposed in `Implicit Fence Poll Support`_ must follow the
>  	 * below rules.
>  	 *
> -	 * - Drivers must add a shared fence through dma_resv_add_shared_fence()
> -	 *   for anything the userspace API considers a read access. This highly
> -	 *   depends upon the API and window system.
> +	 * - Drivers must add a read fence through dma_resv_add_fence() with the
> +	 *   DMA_RESV_USAGE_READ flag for anything the userspace API considers a
> +	 *   read access. This highly depends upon the API and window system.
>  	 *
> -	 * - Similarly drivers must set the exclusive fence through
> -	 *   dma_resv_add_excl_fence() for anything the userspace API considers
> -	 *   write access.
> +	 * - Similarly drivers must add a write fence through
> +	 *   dma_resv_add_fence() with the DMA_RESV_USAGE_WRITE flag for
> +	 *   anything the userspace API considers write access.
>  	 *
> -	 * - Drivers may just always set the exclusive fence, since that only
> +	 * - Drivers may just always add a write fence, since that only
>  	 *   causes unecessarily synchronization, but no correctness issues.
>  	 *
>  	 * - Some drivers only expose a synchronous userspace API with no
> @@ -416,7 +416,7 @@ struct dma_buf {
>  	 * Dynamic importers, see dma_buf_attachment_is_dynamic(), have
>  	 * additional constraints on how they set up fences:
>  	 *
> -	 * - Dynamic importers must obey the exclusive fence and wait for it to
> +	 * - Dynamic importers must obey the write fences and wait for them to
>  	 *   signal before allowing access to the buffer's underlying storage
>  	 *   through the device.
>  	 *
> diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
> index 92cd8023980f..98dc5234b487 100644
> --- a/include/linux/dma-resv.h
> +++ b/include/linux/dma-resv.h
> @@ -195,6 +195,9 @@ struct dma_resv_iter {
>  	/** @fence: the currently handled fence */
>  	struct dma_fence *fence;
>  
> +	/** @fence_usage: the usage of the current fence */
> +	enum dma_resv_usage fence_usage;
> +
>  	/** @seq: sequence number to check for modifications */
>  	unsigned int seq;
>  
> @@ -244,14 +247,15 @@ static inline void dma_resv_iter_end(struct dma_resv_iter *cursor)
>  }
>  
>  /**
> - * dma_resv_iter_is_exclusive - test if the current fence is the exclusive one
> + * dma_resv_iter_usage - Return the usage of the current fence
>   * @cursor: the cursor of the current position
>   *
> - * Returns true if the currently returned fence is the exclusive one.
> + * Returns the usage of the currently processed fence.
>   */
> -static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor)
> +static inline enum dma_resv_usage
> +dma_resv_iter_usage(struct dma_resv_iter *cursor)
>  {
> -	return cursor->index == 0;
> +	return cursor->fence_usage;
>  }
>  
>  /**
> @@ -306,9 +310,9 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor)
>  #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
>  
>  #ifdef CONFIG_DEBUG_MUTEXES
> -void dma_resv_reset_shared_max(struct dma_resv *obj);
> +void dma_resv_reset_max_fences(struct dma_resv *obj);
>  #else
> -static inline void dma_resv_reset_shared_max(struct dma_resv *obj) {}
> +static inline void dma_resv_reset_max_fences(struct dma_resv *obj) {}
>  #endif
>  
>  /**
> @@ -454,17 +458,18 @@ static inline struct ww_acquire_ctx *dma_resv_locking_ctx(struct dma_resv *obj)
>   */
>  static inline void dma_resv_unlock(struct dma_resv *obj)
>  {
> -	dma_resv_reset_shared_max(obj);
> +	dma_resv_reset_max_fences(obj);
>  	ww_mutex_unlock(&obj->lock);
>  }
>  
>  void dma_resv_init(struct dma_resv *obj);
>  void dma_resv_fini(struct dma_resv *obj);
>  int dma_resv_reserve_fences(struct dma_resv *obj, unsigned int num_fences);
> -void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence);
> +void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
> +			enum dma_resv_usage usage);
>  void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context,
> -			     struct dma_fence *fence);
> -void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence);
> +			     struct dma_fence *fence,
> +			     enum dma_resv_usage usage);
>  int dma_resv_get_fences(struct dma_resv *obj, enum dma_resv_usage usage,
>  			unsigned int *num_fences, struct dma_fence ***fences);
>  int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage,

Really only bikesheds left. I think ... I guess better to merge this
sooner and test more than later.

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> -- 
> 2.25.1
> 

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



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