Re: [PATCH v7 1/2] drm/buddy: Add start address support to trim function

[Matthew Auld <matthew.auld@xxxxxxxxx>]

On 23/07/2024 14:25, Arunpravin Paneer Selvam wrote:
> - Add a new start parameter in trim function to specify exact
>    address from where to start the trimming. This would help us
>    in situations like if drivers would like to do address alignment
>    for specific requirements.
>
> - Add a new flag DRM_BUDDY_TRIM_DISABLE. Drivers can use this
>    flag to disable the allocator trimming part. This patch enables
>    the drivers control trimming and they can do it themselves
>    based on the application requirements.
>
> v1:(Matthew)
>    - check new_start alignment with min chunk_size
>    - use range_overflows()
>
> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
> Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Acked-by: Christian König <christian.koenig@xxxxxxx>

Given the comment from Marek that this is about non power-of-two 
alignment, this makes sense (although might be good to mention that 
somewhere in the commit message to make that clearer),
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>

> ---
>   drivers/gpu/drm/drm_buddy.c          | 25 +++++++++++++++++++++++--
>   drivers/gpu/drm/xe/xe_ttm_vram_mgr.c |  2 +-
>   include/drm/drm_buddy.h              |  2 ++
>   3 files changed, 26 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
> index 6a8e45e9d0ec..103c185bb1c8 100644
> --- a/drivers/gpu/drm/drm_buddy.c
> +++ b/drivers/gpu/drm/drm_buddy.c
> @@ -851,6 +851,7 @@ static int __alloc_contig_try_harder(struct drm_buddy *mm,
>    * drm_buddy_block_trim - free unused pages
>    *
>    * @mm: DRM buddy manager
> + * @start: start address to begin the trimming.
>    * @new_size: original size requested
>    * @blocks: Input and output list of allocated blocks.
>    * MUST contain single block as input to be trimmed.
> @@ -866,11 +867,13 @@ static int __alloc_contig_try_harder(struct drm_buddy *mm,
>    * 0 on success, error code on failure.
>    */
>   int drm_buddy_block_trim(struct drm_buddy *mm,
> +			 u64 *start,
>   			 u64 new_size,
>   			 struct list_head *blocks)
>   {
>   	struct drm_buddy_block *parent;
>   	struct drm_buddy_block *block;
> +	u64 block_start, block_end;
>   	LIST_HEAD(dfs);
>   	u64 new_start;
>   	int err;
> @@ -882,6 +885,9 @@ int drm_buddy_block_trim(struct drm_buddy *mm,
>   				 struct drm_buddy_block,
>   				 link);
>   
> +	block_start = drm_buddy_block_offset(block);
> +	block_end = block_start + drm_buddy_block_size(mm, block);
> +
>   	if (WARN_ON(!drm_buddy_block_is_allocated(block)))
>   		return -EINVAL;
>   
> @@ -894,6 +900,20 @@ int drm_buddy_block_trim(struct drm_buddy *mm,
>   	if (new_size == drm_buddy_block_size(mm, block))
>   		return 0;
>   
> +	new_start = block_start;
> +	if (start) {
> +		new_start = *start;
> +
> +		if (new_start < block_start)
> +			return -EINVAL;
> +
> +		if (!IS_ALIGNED(new_start, mm->chunk_size))
> +			return -EINVAL;
> +
> +		if (range_overflows(new_start, new_size, block_end))
> +			return -EINVAL;
> +	}
> +
>   	list_del(&block->link);
>   	mark_free(mm, block);
>   	mm->avail += drm_buddy_block_size(mm, block);
> @@ -904,7 +924,6 @@ int drm_buddy_block_trim(struct drm_buddy *mm,
>   	parent = block->parent;
>   	block->parent = NULL;
>   
> -	new_start = drm_buddy_block_offset(block);
>   	list_add(&block->tmp_link, &dfs);
>   	err =  __alloc_range(mm, &dfs, new_start, new_size, blocks, NULL);
>   	if (err) {
> @@ -1066,7 +1085,8 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>   	} while (1);
>   
>   	/* Trim the allocated block to the required size */
> -	if (original_size != size) {
> +	if (!(flags & DRM_BUDDY_TRIM_DISABLE) &&
> +	    original_size != size) {
>   		struct list_head *trim_list;
>   		LIST_HEAD(temp);
>   		u64 trim_size;
> @@ -1083,6 +1103,7 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>   		}
>   
>   		drm_buddy_block_trim(mm,
> +				     NULL,
>   				     trim_size,
>   				     trim_list);
>   
> diff --git a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
> index fe3779fdba2c..423b261ea743 100644
> --- a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
> +++ b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
> @@ -150,7 +150,7 @@ static int xe_ttm_vram_mgr_new(struct ttm_resource_manager *man,
>   	} while (remaining_size);
>   
>   	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
> -		if (!drm_buddy_block_trim(mm, vres->base.size, &vres->blocks))
> +		if (!drm_buddy_block_trim(mm, NULL, vres->base.size, &vres->blocks))
>   			size = vres->base.size;
>   	}
>   
> diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
> index 2a74fa9d0ce5..9689a7c5dd36 100644
> --- a/include/drm/drm_buddy.h
> +++ b/include/drm/drm_buddy.h
> @@ -27,6 +27,7 @@
>   #define DRM_BUDDY_CONTIGUOUS_ALLOCATION		BIT(2)
>   #define DRM_BUDDY_CLEAR_ALLOCATION		BIT(3)
>   #define DRM_BUDDY_CLEARED			BIT(4)
> +#define DRM_BUDDY_TRIM_DISABLE			BIT(5)
>   
>   struct drm_buddy_block {
>   #define DRM_BUDDY_HEADER_OFFSET GENMASK_ULL(63, 12)
> @@ -155,6 +156,7 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>   			   unsigned long flags);
>   
>   int drm_buddy_block_trim(struct drm_buddy *mm,
> +			 u64 *start,
>   			 u64 new_size,
>   			 struct list_head *blocks);
>   
>
> base-commit: b27d70e1042bf6a31ba7e5acf58b61c9cd28f95b