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authorArunpravin <Arunpravin.PaneerSelvam@amd.com>2022-02-21 19:45:50 +0300
committerChristian König <christian.koenig@amd.com>2022-02-22 15:03:00 +0300
commit95ee2a8b4b3cd1fb25f7e14e2202da4045030173 (patch)
tree0ffe4f5bf8a6b8f05409346e9cfee1966ff10e8f /include/drm
parent476e4063022787b5720758239ee4c22fa2495e82 (diff)
downloadlinux-95ee2a8b4b3cd1fb25f7e14e2202da4045030173.tar.xz
drm: implement a method to free unused pages
On contiguous allocation, we round up the size to the *next* power of 2, implement a function to free the unused pages after the newly allocate block. v2(Matthew Auld): - replace function name 'drm_buddy_free_unused_pages' with drm_buddy_block_trim - replace input argument name 'actual_size' with 'new_size' - add more validation checks for input arguments - add overlaps check to avoid needless searching and splitting - merged the below patch to see the feature in action - add free unused pages support to i915 driver - lock drm_buddy_block_trim() function as it calls mark_free/mark_split are all globally visible v3(Matthew Auld): - remove trim method error handling as we address the failure case at drm_buddy_block_trim() function v4: - in case of trim, at __alloc_range() split_block failure path marks the block as free and removes it from the original list, potentially also freeing it, to overcome this problem, we turn the drm_buddy_block_trim() input node into a temporary node to prevent recursively freeing itself, but still retain the un-splitting/freeing of the other nodes(Matthew Auld) - modify the drm_buddy_block_trim() function return type v5(Matthew Auld): - revert drm_buddy_block_trim() function return type changes in v4 - modify drm_buddy_block_trim() passing argument n_pages to original_size as n_pages has already been rounded up to the next power-of-two and passing n_pages results noop v6: - fix warnings reported by kernel test robot <lkp@intel.com> v7: - modify drm_buddy_block_trim() function doc description - at drm_buddy_block_trim() handle non-allocated block as a serious programmer error - fix a typo Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam@amd.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220221164552.2434-3-Arunpravin.PaneerSelvam@amd.com Signed-off-by: Christian König <christian.koenig@amd.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_buddy.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
index f0378fb48d06..bd21f9dfd15e 100644
--- a/include/drm/drm_buddy.h
+++ b/include/drm/drm_buddy.h
@@ -140,6 +140,10 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm,
struct list_head *blocks,
unsigned long flags);
+int drm_buddy_block_trim(struct drm_buddy *mm,
+ u64 new_size,
+ struct list_head *blocks);
+
void drm_buddy_free_block(struct drm_buddy *mm, struct drm_buddy_block *block);
void drm_buddy_free_list(struct drm_buddy *mm, struct list_head *objects);