[PATCH v5 5/7] drm/amdgpu: get rid of amdgpu_ttm_clear_buffer

[PATCH v5 5/7] drm/amdgpu: get rid of amdgpu_ttm_clear_buffer

[Pierre-Eric Pelloux-Prayer]

It's doing the same thing as amdgpu_fill_buffer(src_data=0), so drop it.

The only caveat is that amdgpu_res_cleared() return value is only valid
right after allocation.

---
v2: introduce new "bool consider_clear_status" arg
---

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 88 +++++-----------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    |  6 +-
 3 files changed, 32 insertions(+), 78 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 66c20dd46d12..d0884bbffa75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -717,13 +717,17 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
 	    bo->tbo.resource->mem_type == TTM_PL_VRAM) {
 		struct dma_fence *fence;
 
-		r = amdgpu_ttm_clear_buffer(bo, bo->tbo.base.resv, &fence);
+		r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
+				       bo, 0, NULL, &fence,
+				       true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
 		if (unlikely(r))
 			goto fail_unreserve;
 
-		dma_resv_add_fence(bo->tbo.base.resv, fence,
-				   DMA_RESV_USAGE_KERNEL);
-		dma_fence_put(fence);
+		if (fence) {
+			dma_resv_add_fence(bo->tbo.base.resv, fence,
+					   DMA_RESV_USAGE_KERNEL);
+			dma_fence_put(fence);
+		}
 	}
 	if (!bp->resv)
 		amdgpu_bo_unreserve(bo);
@@ -1326,8 +1330,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
 		goto out;
 
 	r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
-			       abo, 0, &bo->base._resv,
-			       &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
+			       abo, 0, &bo->base._resv, &fence,
+			       false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
 	if (WARN_ON(r))
 		goto out;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 648ad344e89c..a3d0998b8cec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -418,7 +418,7 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
 		struct dma_fence *wipe_fence = NULL;
 		r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence,
-				       AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
+				       false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
 		if (r) {
 			goto error;
 		} else if (wipe_fence) {
@@ -2572,76 +2572,25 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
 }
 
 /**
- * amdgpu_ttm_clear_buffer - clear memory buffers
- * @bo: amdgpu buffer object
- * @resv: reservation object
- * @fence: dma_fence associated with the operation
+ * amdgpu_fill_buffer - fill a buffer with a given value
+ * @entity: entity to use
+ * @bo: the bo to fill
+ * @src_data: the value to set
+ * @resv: fences contained in this reservation will be used as dependencies.
+ * @out_fence: the fence from the last clear will be stored here. It might be
+ *             NULL if no job was run.
+ * @dependency: optional input dependency fence.
+ * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared()
+ *                         are skipped.
+ * @k_job_id: trace id
  *
- * Clear the memory buffer resource.
- *
- * Returns:
- * 0 for success or a negative error code on failure.
  */
-int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
-			    struct dma_resv *resv,
-			    struct dma_fence **fence)
-{
-	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
-	struct amdgpu_ttm_buffer_entity *entity;
-	struct amdgpu_res_cursor cursor;
-	u64 addr;
-	int r = 0;
-
-	if (!adev->mman.buffer_funcs_enabled)
-		return -EINVAL;
-
-	if (!fence)
-		return -EINVAL;
-	entity = &adev->mman.clear_entities[0];
-	*fence = dma_fence_get_stub();
-
-	amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
-
-	mutex_lock(&entity->lock);
-	while (cursor.remaining) {
-		struct dma_fence *next = NULL;
-		u64 size;
-
-		if (amdgpu_res_cleared(&cursor)) {
-			amdgpu_res_next(&cursor, cursor.size);
-			continue;
-		}
-
-		/* Never clear more than 256MiB at once to avoid timeouts */
-		size = min(cursor.size, 256ULL << 20);
-
-		r = amdgpu_ttm_map_buffer(entity, &bo->tbo, bo->tbo.resource, &cursor,
-					  0, false, &size, &addr);
-		if (r)
-			goto err;
-
-		r = amdgpu_ttm_fill_mem(adev, entity, 0, addr, size, resv,
-					&next, true,
-					AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
-		if (r)
-			goto err;
-
-		dma_fence_put(*fence);
-		*fence = next;
-
-		amdgpu_res_next(&cursor, size);
-	}
-err:
-	mutex_unlock(&entity->lock);
-
-	return r;
-}
-
 int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
 		       struct amdgpu_bo *bo,
 		       uint32_t src_data,
 		       struct dma_resv *resv,
-		       struct dma_fence **f,
+		       struct dma_fence **out_fence,
+		       bool consider_clear_status,
 		       u64 k_job_id)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
@@ -2659,6 +2608,11 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
 		struct dma_fence *next;
 		uint64_t cur_size, to;
 
+		if (consider_clear_status && amdgpu_res_cleared(&dst)) {
+			amdgpu_res_next(&dst, dst.size);
+			continue;
+		}
+
 		/* Never fill more than 256MiB at once to avoid timeouts */
 		cur_size = min(dst.size, 256ULL << 20);
 
@@ -2680,9 +2634,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
 	}
 error:
 	mutex_unlock(&entity->lock);
-	if (f)
-		*f = dma_fence_get(fence);
-	dma_fence_put(fence);
+	*out_fence = fence;
 	return r;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index a6249252948b..436a3e09a178 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -187,14 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
 		       struct dma_resv *resv,
 		       struct dma_fence **fence,
 		       bool vm_needs_flush, uint32_t copy_flags);
-int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
-			    struct dma_resv *resv,
-			    struct dma_fence **fence);
 int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
 		       struct amdgpu_bo *bo,
 		       uint32_t src_data,
 		       struct dma_resv *resv,
-		       struct dma_fence **f,
+		       struct dma_fence **out_fence,
+		       bool consider_clear_status,
 		       u64 k_job_id);
 struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
 
-- 
2.43.0

[PATCH v5 6/7] drm/amdgpu: rename amdgpu_fill_buffer as amdgpu_ttm_clear_buffer

[Pierre-Eric Pelloux-Prayer]

This is the only use case for this function.

---
v2: amdgpu_ttm_clear_buffer instead of amdgpu_clear_buffer
---

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 12 +++++------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 23 ++++++++++------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    | 13 ++++++------
 3 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index d0884bbffa75..195cb1c814d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -717,9 +717,9 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
 	    bo->tbo.resource->mem_type == TTM_PL_VRAM) {
 		struct dma_fence *fence;
 
-		r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
-				       bo, 0, NULL, &fence,
-				       true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
+		r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
+					    bo, NULL, &fence,
+					    true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
 		if (unlikely(r))
 			goto fail_unreserve;
 
@@ -1329,9 +1329,9 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
 	if (r)
 		goto out;
 
-	r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
-			       abo, 0, &bo->base._resv, &fence,
-			       false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
+	r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
+				    abo, &bo->base._resv, &fence,
+				    false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
 	if (WARN_ON(r))
 		goto out;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index a3d0998b8cec..e74f9f8a88dc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -417,8 +417,8 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 	if (old_mem->mem_type == TTM_PL_VRAM &&
 	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
 		struct dma_fence *wipe_fence = NULL;
-		r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence,
-				       false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
+		r = amdgpu_ttm_clear_buffer(entity, abo, NULL, &wipe_fence,
+					    false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
 		if (r) {
 			goto error;
 		} else if (wipe_fence) {
@@ -2572,26 +2572,23 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
 }
 
 /**
- * amdgpu_fill_buffer - fill a buffer with a given value
+ * amdgpu_ttm_clear_buffer - fill a buffer with 0
  * @entity: entity to use
  * @bo: the bo to fill
- * @src_data: the value to set
  * @resv: fences contained in this reservation will be used as dependencies.
  * @out_fence: the fence from the last clear will be stored here. It might be
  *             NULL if no job was run.
- * @dependency: optional input dependency fence.
  * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared()
  *                         are skipped.
  * @k_job_id: trace id
  *
  */
-int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
-		       struct amdgpu_bo *bo,
-		       uint32_t src_data,
-		       struct dma_resv *resv,
-		       struct dma_fence **out_fence,
-		       bool consider_clear_status,
-		       u64 k_job_id)
+int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity,
+			    struct amdgpu_bo *bo,
+			    struct dma_resv *resv,
+			    struct dma_fence **out_fence,
+			    bool consider_clear_status,
+			    u64 k_job_id)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	struct dma_fence *fence = NULL;
@@ -2622,7 +2619,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
 			goto error;
 
 		r = amdgpu_ttm_fill_mem(adev, entity,
-					src_data, to, cur_size, resv,
+					0, to, cur_size, resv,
 					&next, true, k_job_id);
 		if (r)
 			goto error;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 436a3e09a178..d7b14d5cac77 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -187,13 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
 		       struct dma_resv *resv,
 		       struct dma_fence **fence,
 		       bool vm_needs_flush, uint32_t copy_flags);
-int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
-		       struct amdgpu_bo *bo,
-		       uint32_t src_data,
-		       struct dma_resv *resv,
-		       struct dma_fence **out_fence,
-		       bool consider_clear_status,
-		       u64 k_job_id);
+int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity,
+			    struct amdgpu_bo *bo,
+			    struct dma_resv *resv,
+			    struct dma_fence **out_fence,
+			    bool consider_clear_status,
+			    u64 k_job_id);
 struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
 
 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
-- 
2.43.0

Re: [PATCH v5 5/7] drm/amdgpu: get rid of amdgpu_ttm_clear_buffer

[Christian König]

On 4/3/26 10:35, Pierre-Eric Pelloux-Prayer wrote:
> It's doing the same thing as amdgpu_fill_buffer(src_data=0), so drop it.
> 
> The only caveat is that amdgpu_res_cleared() return value is only valid
> right after allocation.
> 
> ---
> v2: introduce new "bool consider_clear_status" arg
> ---
> 
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++--
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 88 +++++-----------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    |  6 +-
>  3 files changed, 32 insertions(+), 78 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 66c20dd46d12..d0884bbffa75 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -717,13 +717,17 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
>  	    bo->tbo.resource->mem_type == TTM_PL_VRAM) {
>  		struct dma_fence *fence;
>  
> -		r = amdgpu_ttm_clear_buffer(bo, bo->tbo.base.resv, &fence);
> +		r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
> +				       bo, 0, NULL, &fence,
> +				       true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
>  		if (unlikely(r))
>  			goto fail_unreserve;
>  
> -		dma_resv_add_fence(bo->tbo.base.resv, fence,
> -				   DMA_RESV_USAGE_KERNEL);
> -		dma_fence_put(fence);
> +		if (fence) {
> +			dma_resv_add_fence(bo->tbo.base.resv, fence,
> +					   DMA_RESV_USAGE_KERNEL);
> +			dma_fence_put(fence);
> +		}
>  	}
>  	if (!bp->resv)
>  		amdgpu_bo_unreserve(bo);
> @@ -1326,8 +1330,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
>  		goto out;
>  
>  	r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
> -			       abo, 0, &bo->base._resv,
> -			       &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
> +			       abo, 0, &bo->base._resv, &fence,
> +			       false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
>  	if (WARN_ON(r))
>  		goto out;
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 648ad344e89c..a3d0998b8cec 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -418,7 +418,7 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
>  	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
>  		struct dma_fence *wipe_fence = NULL;
>  		r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence,
> -				       AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
> +				       false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
>  		if (r) {
>  			goto error;
>  		} else if (wipe_fence) {
> @@ -2572,76 +2572,25 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
>  }
>  
>  /**
> - * amdgpu_ttm_clear_buffer - clear memory buffers
> - * @bo: amdgpu buffer object
> - * @resv: reservation object
> - * @fence: dma_fence associated with the operation
> + * amdgpu_fill_buffer - fill a buffer with a given value
> + * @entity: entity to use
> + * @bo: the bo to fill
> + * @src_data: the value to set
> + * @resv: fences contained in this reservation will be used as dependencies.
> + * @out_fence: the fence from the last clear will be stored here. It might be
> + *             NULL if no job was run.
> + * @dependency: optional input dependency fence.
> + * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared()
> + *                         are skipped.
> + * @k_job_id: trace id
>   *
> - * Clear the memory buffer resource.
> - *
> - * Returns:
> - * 0 for success or a negative error code on failure.
>   */
> -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
> -			    struct dma_resv *resv,
> -			    struct dma_fence **fence)
> -{
> -	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
> -	struct amdgpu_ttm_buffer_entity *entity;
> -	struct amdgpu_res_cursor cursor;
> -	u64 addr;
> -	int r = 0;
> -
> -	if (!adev->mman.buffer_funcs_enabled)
> -		return -EINVAL;
> -
> -	if (!fence)
> -		return -EINVAL;
> -	entity = &adev->mman.clear_entities[0];
> -	*fence = dma_fence_get_stub();
> -
> -	amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
> -
> -	mutex_lock(&entity->lock);
> -	while (cursor.remaining) {
> -		struct dma_fence *next = NULL;
> -		u64 size;
> -
> -		if (amdgpu_res_cleared(&cursor)) {
> -			amdgpu_res_next(&cursor, cursor.size);
> -			continue;
> -		}
> -
> -		/* Never clear more than 256MiB at once to avoid timeouts */
> -		size = min(cursor.size, 256ULL << 20);
> -
> -		r = amdgpu_ttm_map_buffer(entity, &bo->tbo, bo->tbo.resource, &cursor,
> -					  0, false, &size, &addr);
> -		if (r)
> -			goto err;
> -
> -		r = amdgpu_ttm_fill_mem(adev, entity, 0, addr, size, resv,
> -					&next, true,
> -					AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
> -		if (r)
> -			goto err;
> -
> -		dma_fence_put(*fence);
> -		*fence = next;
> -
> -		amdgpu_res_next(&cursor, size);
> -	}
> -err:
> -	mutex_unlock(&entity->lock);
> -
> -	return r;
> -}
> -
>  int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,

We should probably rename the function to amdgpu_ttm_clear_buffer() while doing this.

Apart from that looks good to me.

Regards,
Christian.

>  		       struct amdgpu_bo *bo,
>  		       uint32_t src_data,
>  		       struct dma_resv *resv,
> -		       struct dma_fence **f,
> +		       struct dma_fence **out_fence,
> +		       bool consider_clear_status,
>  		       u64 k_job_id)
>  {
>  	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
> @@ -2659,6 +2608,11 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>  		struct dma_fence *next;
>  		uint64_t cur_size, to;
>  
> +		if (consider_clear_status && amdgpu_res_cleared(&dst)) {
> +			amdgpu_res_next(&dst, dst.size);
> +			continue;
> +		}
> +
>  		/* Never fill more than 256MiB at once to avoid timeouts */
>  		cur_size = min(dst.size, 256ULL << 20);
>  
> @@ -2680,9 +2634,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>  	}
>  error:
>  	mutex_unlock(&entity->lock);
> -	if (f)
> -		*f = dma_fence_get(fence);
> -	dma_fence_put(fence);
> +	*out_fence = fence;
>  	return r;
>  }
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index a6249252948b..436a3e09a178 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -187,14 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
>  		       struct dma_resv *resv,
>  		       struct dma_fence **fence,
>  		       bool vm_needs_flush, uint32_t copy_flags);
> -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
> -			    struct dma_resv *resv,
> -			    struct dma_fence **fence);
>  int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>  		       struct amdgpu_bo *bo,
>  		       uint32_t src_data,
>  		       struct dma_resv *resv,
> -		       struct dma_fence **f,
> +		       struct dma_fence **out_fence,
> +		       bool consider_clear_status,
>  		       u64 k_job_id);
>  struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
>  

Re: [PATCH v5 5/7] drm/amdgpu: get rid of amdgpu_ttm_clear_buffer

[Christian König]

On 4/7/26 12:09, Christian König wrote:
> 
> 
> On 4/3/26 10:35, Pierre-Eric Pelloux-Prayer wrote:
>> It's doing the same thing as amdgpu_fill_buffer(src_data=0), so drop it.
>>
>> The only caveat is that amdgpu_res_cleared() return value is only valid
>> right after allocation.
>>
>> ---
>> v2: introduce new "bool consider_clear_status" arg
>> ---
>>
>> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++--
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 88 +++++-----------------
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    |  6 +-
>>  3 files changed, 32 insertions(+), 78 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> index 66c20dd46d12..d0884bbffa75 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> @@ -717,13 +717,17 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
>>  	    bo->tbo.resource->mem_type == TTM_PL_VRAM) {
>>  		struct dma_fence *fence;
>>  
>> -		r = amdgpu_ttm_clear_buffer(bo, bo->tbo.base.resv, &fence);
>> +		r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
>> +				       bo, 0, NULL, &fence,
>> +				       true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
>>  		if (unlikely(r))
>>  			goto fail_unreserve;
>>  
>> -		dma_resv_add_fence(bo->tbo.base.resv, fence,
>> -				   DMA_RESV_USAGE_KERNEL);
>> -		dma_fence_put(fence);
>> +		if (fence) {
>> +			dma_resv_add_fence(bo->tbo.base.resv, fence,
>> +					   DMA_RESV_USAGE_KERNEL);
>> +			dma_fence_put(fence);
>> +		}
>>  	}
>>  	if (!bp->resv)
>>  		amdgpu_bo_unreserve(bo);
>> @@ -1326,8 +1330,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
>>  		goto out;
>>  
>>  	r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
>> -			       abo, 0, &bo->base._resv,
>> -			       &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
>> +			       abo, 0, &bo->base._resv, &fence,
>> +			       false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
>>  	if (WARN_ON(r))
>>  		goto out;
>>  
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> index 648ad344e89c..a3d0998b8cec 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> @@ -418,7 +418,7 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
>>  	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
>>  		struct dma_fence *wipe_fence = NULL;
>>  		r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence,
>> -				       AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
>> +				       false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
>>  		if (r) {
>>  			goto error;
>>  		} else if (wipe_fence) {
>> @@ -2572,76 +2572,25 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
>>  }
>>  
>>  /**
>> - * amdgpu_ttm_clear_buffer - clear memory buffers
>> - * @bo: amdgpu buffer object
>> - * @resv: reservation object
>> - * @fence: dma_fence associated with the operation
>> + * amdgpu_fill_buffer - fill a buffer with a given value
>> + * @entity: entity to use
>> + * @bo: the bo to fill
>> + * @src_data: the value to set
>> + * @resv: fences contained in this reservation will be used as dependencies.
>> + * @out_fence: the fence from the last clear will be stored here. It might be
>> + *             NULL if no job was run.
>> + * @dependency: optional input dependency fence.
>> + * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared()
>> + *                         are skipped.
>> + * @k_job_id: trace id
>>   *
>> - * Clear the memory buffer resource.
>> - *
>> - * Returns:
>> - * 0 for success or a negative error code on failure.
>>   */
>> -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
>> -			    struct dma_resv *resv,
>> -			    struct dma_fence **fence)
>> -{
>> -	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
>> -	struct amdgpu_ttm_buffer_entity *entity;
>> -	struct amdgpu_res_cursor cursor;
>> -	u64 addr;
>> -	int r = 0;
>> -
>> -	if (!adev->mman.buffer_funcs_enabled)
>> -		return -EINVAL;
>> -
>> -	if (!fence)
>> -		return -EINVAL;
>> -	entity = &adev->mman.clear_entities[0];
>> -	*fence = dma_fence_get_stub();
>> -
>> -	amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
>> -
>> -	mutex_lock(&entity->lock);
>> -	while (cursor.remaining) {
>> -		struct dma_fence *next = NULL;
>> -		u64 size;
>> -
>> -		if (amdgpu_res_cleared(&cursor)) {
>> -			amdgpu_res_next(&cursor, cursor.size);
>> -			continue;
>> -		}
>> -
>> -		/* Never clear more than 256MiB at once to avoid timeouts */
>> -		size = min(cursor.size, 256ULL << 20);
>> -
>> -		r = amdgpu_ttm_map_buffer(entity, &bo->tbo, bo->tbo.resource, &cursor,
>> -					  0, false, &size, &addr);
>> -		if (r)
>> -			goto err;
>> -
>> -		r = amdgpu_ttm_fill_mem(adev, entity, 0, addr, size, resv,
>> -					&next, true,
>> -					AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
>> -		if (r)
>> -			goto err;
>> -
>> -		dma_fence_put(*fence);
>> -		*fence = next;
>> -
>> -		amdgpu_res_next(&cursor, size);
>> -	}
>> -err:
>> -	mutex_unlock(&entity->lock);
>> -
>> -	return r;
>> -}
>> -
>>  int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
> 
> We should probably rename the function to amdgpu_ttm_clear_buffer() while doing this.

Forget that, I've just seen that patch #6 does exactly that.

Feel free to add Reviewed-by: Christian König <christian.koenig@amd.com>.

Regards,
Christian.

> 
> Apart from that looks good to me.
> 
> Regards,
> Christian.
> 
>>  		       struct amdgpu_bo *bo,
>>  		       uint32_t src_data,
>>  		       struct dma_resv *resv,
>> -		       struct dma_fence **f,
>> +		       struct dma_fence **out_fence,
>> +		       bool consider_clear_status,
>>  		       u64 k_job_id)
>>  {
>>  	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
>> @@ -2659,6 +2608,11 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>>  		struct dma_fence *next;
>>  		uint64_t cur_size, to;
>>  
>> +		if (consider_clear_status && amdgpu_res_cleared(&dst)) {
>> +			amdgpu_res_next(&dst, dst.size);
>> +			continue;
>> +		}
>> +
>>  		/* Never fill more than 256MiB at once to avoid timeouts */
>>  		cur_size = min(dst.size, 256ULL << 20);
>>  
>> @@ -2680,9 +2634,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>>  	}
>>  error:
>>  	mutex_unlock(&entity->lock);
>> -	if (f)
>> -		*f = dma_fence_get(fence);
>> -	dma_fence_put(fence);
>> +	*out_fence = fence;
>>  	return r;
>>  }
>>  
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>> index a6249252948b..436a3e09a178 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>> @@ -187,14 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
>>  		       struct dma_resv *resv,
>>  		       struct dma_fence **fence,
>>  		       bool vm_needs_flush, uint32_t copy_flags);
>> -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
>> -			    struct dma_resv *resv,
>> -			    struct dma_fence **fence);
>>  int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>>  		       struct amdgpu_bo *bo,
>>  		       uint32_t src_data,
>>  		       struct dma_resv *resv,
>> -		       struct dma_fence **f,
>> +		       struct dma_fence **out_fence,
>> +		       bool consider_clear_status,
>>  		       u64 k_job_id);
>>  struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
>>  
> 

Re: [PATCH v5 6/7] drm/amdgpu: rename amdgpu_fill_buffer as amdgpu_ttm_clear_buffer

[Christian König]

On 4/3/26 10:35, Pierre-Eric Pelloux-Prayer wrote:
> This is the only use case for this function.
> 
> ---
> v2: amdgpu_ttm_clear_buffer instead of amdgpu_clear_buffer
> ---
> 
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
> Reviewed-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 12 +++++------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 23 ++++++++++------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    | 13 ++++++------
>  3 files changed, 22 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index d0884bbffa75..195cb1c814d1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -717,9 +717,9 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
>  	    bo->tbo.resource->mem_type == TTM_PL_VRAM) {
>  		struct dma_fence *fence;
>  
> -		r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
> -				       bo, 0, NULL, &fence,
> -				       true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
> +		r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
> +					    bo, NULL, &fence,

Wait a second. Why is the dependency NULL here?

Could it be that we relied on the fact that clears and moves were serialized in the past?

Regards,
Christian.

> +					    true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
>  		if (unlikely(r))
>  			goto fail_unreserve;
>  
> @@ -1329,9 +1329,9 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
>  	if (r)
>  		goto out;
>  
> -	r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev),
> -			       abo, 0, &bo->base._resv, &fence,
> -			       false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
> +	r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev),
> +				    abo, &bo->base._resv, &fence,
> +				    false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
>  	if (WARN_ON(r))
>  		goto out;
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index a3d0998b8cec..e74f9f8a88dc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -417,8 +417,8 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
>  	if (old_mem->mem_type == TTM_PL_VRAM &&
>  	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
>  		struct dma_fence *wipe_fence = NULL;
> -		r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence,
> -				       false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
> +		r = amdgpu_ttm_clear_buffer(entity, abo, NULL, &wipe_fence,
> +					    false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
>  		if (r) {
>  			goto error;
>  		} else if (wipe_fence) {
> @@ -2572,26 +2572,23 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
>  }
>  
>  /**
> - * amdgpu_fill_buffer - fill a buffer with a given value
> + * amdgpu_ttm_clear_buffer - fill a buffer with 0
>   * @entity: entity to use
>   * @bo: the bo to fill
> - * @src_data: the value to set
>   * @resv: fences contained in this reservation will be used as dependencies.
>   * @out_fence: the fence from the last clear will be stored here. It might be
>   *             NULL if no job was run.
> - * @dependency: optional input dependency fence.
>   * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared()
>   *                         are skipped.
>   * @k_job_id: trace id
>   *
>   */
> -int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
> -		       struct amdgpu_bo *bo,
> -		       uint32_t src_data,
> -		       struct dma_resv *resv,
> -		       struct dma_fence **out_fence,
> -		       bool consider_clear_status,
> -		       u64 k_job_id)
> +int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity,
> +			    struct amdgpu_bo *bo,
> +			    struct dma_resv *resv,
> +			    struct dma_fence **out_fence,
> +			    bool consider_clear_status,
> +			    u64 k_job_id)
>  {
>  	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
>  	struct dma_fence *fence = NULL;
> @@ -2622,7 +2619,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>  			goto error;
>  
>  		r = amdgpu_ttm_fill_mem(adev, entity,
> -					src_data, to, cur_size, resv,
> +					0, to, cur_size, resv,
>  					&next, true, k_job_id);
>  		if (r)
>  			goto error;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index 436a3e09a178..d7b14d5cac77 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -187,13 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
>  		       struct dma_resv *resv,
>  		       struct dma_fence **fence,
>  		       bool vm_needs_flush, uint32_t copy_flags);
> -int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
> -		       struct amdgpu_bo *bo,
> -		       uint32_t src_data,
> -		       struct dma_resv *resv,
> -		       struct dma_fence **out_fence,
> -		       bool consider_clear_status,
> -		       u64 k_job_id);
> +int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity,
> +			    struct amdgpu_bo *bo,
> +			    struct dma_resv *resv,
> +			    struct dma_fence **out_fence,
> +			    bool consider_clear_status,
> +			    u64 k_job_id);
>  struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
>  
>  int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);