drm: move the buddy allocator from i915 into common drm

Move the base i915 buddy allocator code into drm
- Move i915_buddy.h to include/drm
- Move i915_buddy.c to drm root folder
- Rename "i915" string with "drm" string wherever applicable
- Rename "I915" string with "DRM" string wherever applicable
- Fix header file dependencies
- Fix alignment issues
- add Makefile support for drm buddy
- export functions and write kerneldoc description
- Remove i915 selftest config check condition as buddy selftest
  will be moved to drm selftest folder

cleanup i915 buddy references in i915 driver module
and replace with drm buddy

v2:
  - include header file in alphabetical order(Thomas)
  - merged changes listed in the body section into a single patch
    to keep the build intact(Christian, Jani)

v3:
  - make drm buddy a separate module(Thomas, Christian)

v4:
  - Fix build error reported by kernel test robot <lkp@intel.com>
  - removed i915 buddy selftest from i915_mock_selftests.h to
    avoid build error
  - removed selftests/i915_buddy.c file as we create a new set of
    buddy test cases in drm/selftests folder

v5:
  - Fix merge conflict issue

v6:
  - replace drm_buddy_mm structure name as drm_buddy(Thomas, Christian)
  - replace drm_buddy_alloc() function name as drm_buddy_alloc_blocks()
    (Thomas)
  - replace drm_buddy_free() function name as drm_buddy_free_block()
    (Thomas)
  - export drm_buddy_free_block() function
  - fix multiple instances of KMEM_CACHE() entry

v7:
  - fix warnings reported by kernel test robot <lkp@intel.com>
  - modify the license(Christian)

v8:
  - fix warnings reported by kernel test robot <lkp@intel.com>

Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220118104504.2349-1-Arunpravin.PaneerSelvam@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c
index 41f2adb6a583..159571b9bd24 100644
--- a/drivers/gpu/drm/i915/i915_scatterlist.c
+++ b/drivers/gpu/drm/i915/i915_scatterlist.c
@@ -5,10 +5,9 @@
  */
 
 #include "i915_scatterlist.h"
-
-#include "i915_buddy.h"
 #include "i915_ttm_buddy_manager.h"
 
+#include <drm/drm_buddy.h>
 #include <drm/drm_mm.h>
 
 #include <linux/slab.h>
@@ -153,9 +152,9 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
 	struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
 	const u64 size = res->num_pages << PAGE_SHIFT;
 	const u64 max_segment = rounddown(UINT_MAX, PAGE_SIZE);
-	struct i915_buddy_mm *mm = bman_res->mm;
+	struct drm_buddy *mm = bman_res->mm;
 	struct list_head *blocks = &bman_res->blocks;
-	struct i915_buddy_block *block;
+	struct drm_buddy_block *block;
 	struct i915_refct_sgt *rsgt;
 	struct scatterlist *sg;
 	struct sg_table *st;
@@ -181,8 +180,8 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
 	list_for_each_entry(block, blocks, link) {
 		u64 block_size, offset;
 
-		block_size = min_t(u64, size, i915_buddy_block_size(mm, block));
-		offset = i915_buddy_block_offset(block);
+		block_size = min_t(u64, size, drm_buddy_block_size(mm, block));
+		offset = drm_buddy_block_offset(block);
 
 		while (block_size) {
 			u64 len;