[PATCH v12 1/5] drm: improve drm_buddy_alloc function
Arunpravin
arunpravin.paneerselvam at amd.com
Wed Feb 16 08:07:34 UTC 2022
On 14/02/22 2:42 pm, Christian König wrote:
>
>
> Am 14.02.22 um 09:36 schrieb Matthew Auld:
>> On Mon, 14 Feb 2022 at 06:32, Christian König
>> <ckoenig.leichtzumerken at gmail.com> wrote:
>>> Am 13.02.22 um 09:52 schrieb Arunpravin:
>>>> - Make drm_buddy_alloc a single function to handle
>>>> range allocation and non-range allocation demands
>>>>
>>>> - Implemented a new function alloc_range() which allocates
>>>> the requested power-of-two block comply with range limitations
>>>>
>>>> - Moved order computation and memory alignment logic from
>>>> i915 driver to drm buddy
>>>>
>>>> v2:
>>>> merged below changes to keep the build unbroken
>>>> - drm_buddy_alloc_range() becomes obsolete and may be removed
>>>> - enable ttm range allocation (fpfn / lpfn) support in i915 driver
>>>> - apply enhanced drm_buddy_alloc() function to i915 driver
>>>>
>>>> v3(Matthew Auld):
>>>> - Fix alignment issues and remove unnecessary list_empty check
>>>> - add more validation checks for input arguments
>>>> - make alloc_range() block allocations as bottom-up
>>>> - optimize order computation logic
>>>> - replace uint64_t with u64, which is preferred in the kernel
>>>>
>>>> v4(Matthew Auld):
>>>> - keep drm_buddy_alloc_range() function implementation for generic
>>>> actual range allocations
>>>> - keep alloc_range() implementation for end bias allocations
>>>>
>>>> v5(Matthew Auld):
>>>> - modify drm_buddy_alloc() passing argument place->lpfn to lpfn
>>>> as place->lpfn will currently always be zero for i915
>>>>
>>>> v6(Matthew Auld):
>>>> - fixup potential uaf - If we are unlucky and can't allocate
>>>> enough memory when splitting blocks, where we temporarily
>>>> end up with the given block and its buddy on the respective
>>>> free list, then we need to ensure we delete both blocks,
>>>> and no just the buddy, before potentially freeing them
>>>>
>>>> - fix warnings reported by kernel test robot <lkp at intel.com>
>>>>
>>>> v7(Matthew Auld):
>>>> - revert fixup potential uaf
>>>> - keep __alloc_range() add node to the list logic same as
>>>> drm_buddy_alloc_blocks() by having a temporary list variable
>>>> - at drm_buddy_alloc_blocks() keep i915 range_overflows macro
>>>> and add a new check for end variable
>>>>
>>>> v8:
>>>> - fix warnings reported by kernel test robot <lkp at intel.com>
>>>>
>>>> v9(Matthew Auld):
>>>> - remove DRM_BUDDY_RANGE_ALLOCATION flag
>>>> - remove unnecessary function description
>>>>
>>>> Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam at amd.com>
>>>> Reviewed-by: Matthew Auld <matthew.auld at intel.com>
>>> As long as nobody objects I'm going to push patches 1-3 to drm-misc-next
>>> in the next hour or so:
>> As part of this could you also push
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.freedesktop.org%2Fseries%2F99842%2F&data=04%7C01%7CArunpravin.PaneerSelvam%40amd.com%7Cc50a2b13b2a0425e596f08d9ef9a2d60%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637804268194961068%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ENxu%2BSquLubBYLkNYV1SIUau1u7aZMdjz22izvv3FvM%3D&reserved=0 ?
>
> Sure, but Arun said in our internal chat that I should wait with that
> anyway since he wanted to sort out one more issue.
>
> Christian.
>
working on 2 issues,
1. I think we need to keep DRM_BUDDY_RANGE_ALLOCATION flag, some corner
case didnt allow amdgpu driver load
2. rebasing the existing amdgpu_vram_mgr.c and resolving all conflicts
as there are many changes merged in with the below patch
- drm/amdgpu: remove VRAM accounting v2
>>
>>> Then going to take a deeper look into patches 4 and 5 to get them reviewed.
>>>
>>> Thanks,
>>> Christian.
>>>
>>>> ---
>>>> drivers/gpu/drm/drm_buddy.c | 292 +++++++++++++-----
>>>> drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 63 ++--
>>>> drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 2 +
>>>> include/drm/drm_buddy.h | 11 +-
>>>> 4 files changed, 250 insertions(+), 118 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
>>>> index d60878bc9c20..e0c0d786a572 100644
>>>> --- a/drivers/gpu/drm/drm_buddy.c
>>>> +++ b/drivers/gpu/drm/drm_buddy.c
>>>> @@ -282,23 +282,97 @@ void drm_buddy_free_list(struct drm_buddy *mm, struct list_head *objects)
>>>> }
>>>> EXPORT_SYMBOL(drm_buddy_free_list);
>>>>
>>>> -/**
>>>> - * drm_buddy_alloc_blocks - allocate power-of-two blocks
>>>> - *
>>>> - * @mm: DRM buddy manager to allocate from
>>>> - * @order: size of the allocation
>>>> - *
>>>> - * The order value here translates to:
>>>> - *
>>>> - * 0 = 2^0 * mm->chunk_size
>>>> - * 1 = 2^1 * mm->chunk_size
>>>> - * 2 = 2^2 * mm->chunk_size
>>>> - *
>>>> - * Returns:
>>>> - * allocated ptr to the &drm_buddy_block on success
>>>> - */
>>>> -struct drm_buddy_block *
>>>> -drm_buddy_alloc_blocks(struct drm_buddy *mm, unsigned int order)
>>>> +static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2)
>>>> +{
>>>> + return s1 <= e2 && e1 >= s2;
>>>> +}
>>>> +
>>>> +static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2)
>>>> +{
>>>> + return s1 <= s2 && e1 >= e2;
>>>> +}
>>>> +
>>>> +static struct drm_buddy_block *
>>>> +alloc_range_bias(struct drm_buddy *mm,
>>>> + u64 start, u64 end,
>>>> + unsigned int order)
>>>> +{
>>>> + struct drm_buddy_block *block;
>>>> + struct drm_buddy_block *buddy;
>>>> + LIST_HEAD(dfs);
>>>> + int err;
>>>> + int i;
>>>> +
>>>> + end = end - 1;
>>>> +
>>>> + for (i = 0; i < mm->n_roots; ++i)
>>>> + list_add_tail(&mm->roots[i]->tmp_link, &dfs);
>>>> +
>>>> + do {
>>>> + u64 block_start;
>>>> + u64 block_end;
>>>> +
>>>> + block = list_first_entry_or_null(&dfs,
>>>> + struct drm_buddy_block,
>>>> + tmp_link);
>>>> + if (!block)
>>>> + break;
>>>> +
>>>> + list_del(&block->tmp_link);
>>>> +
>>>> + if (drm_buddy_block_order(block) < order)
>>>> + continue;
>>>> +
>>>> + block_start = drm_buddy_block_offset(block);
>>>> + block_end = block_start + drm_buddy_block_size(mm, block) - 1;
>>>> +
>>>> + if (!overlaps(start, end, block_start, block_end))
>>>> + continue;
>>>> +
>>>> + if (drm_buddy_block_is_allocated(block))
>>>> + continue;
>>>> +
>>>> + if (contains(start, end, block_start, block_end) &&
>>>> + order == drm_buddy_block_order(block)) {
>>>> + /*
>>>> + * Find the free block within the range.
>>>> + */
>>>> + if (drm_buddy_block_is_free(block))
>>>> + return block;
>>>> +
>>>> + continue;
>>>> + }
>>>> +
>>>> + if (!drm_buddy_block_is_split(block)) {
>>>> + err = split_block(mm, block);
>>>> + if (unlikely(err))
>>>> + goto err_undo;
>>>> + }
>>>> +
>>>> + list_add(&block->right->tmp_link, &dfs);
>>>> + list_add(&block->left->tmp_link, &dfs);
>>>> + } while (1);
>>>> +
>>>> + return ERR_PTR(-ENOSPC);
>>>> +
>>>> +err_undo:
>>>> + /*
>>>> + * We really don't want to leave around a bunch of split blocks, since
>>>> + * bigger is better, so make sure we merge everything back before we
>>>> + * free the allocated blocks.
>>>> + */
>>>> + buddy = get_buddy(block);
>>>> + if (buddy &&
>>>> + (drm_buddy_block_is_free(block) &&
>>>> + drm_buddy_block_is_free(buddy)))
>>>> + __drm_buddy_free(mm, block);
>>>> + return ERR_PTR(err);
>>>> +}
>>>> +
>>>> +static struct drm_buddy_block *
>>>> +alloc_from_freelist(struct drm_buddy *mm,
>>>> + unsigned int order,
>>>> + unsigned long flags)
>>>> {
>>>> struct drm_buddy_block *block = NULL;
>>>> unsigned int i;
>>>> @@ -320,78 +394,29 @@ drm_buddy_alloc_blocks(struct drm_buddy *mm, unsigned int order)
>>>> while (i != order) {
>>>> err = split_block(mm, block);
>>>> if (unlikely(err))
>>>> - goto out_free;
>>>> + goto err_undo;
>>>>
>>>> - /* Go low */
>>>> - block = block->left;
>>>> + block = block->right;
>>>> i--;
>>>> }
>>>> -
>>>> - mark_allocated(block);
>>>> - mm->avail -= drm_buddy_block_size(mm, block);
>>>> - kmemleak_update_trace(block);
>>>> return block;
>>>>
>>>> -out_free:
>>>> +err_undo:
>>>> if (i != order)
>>>> __drm_buddy_free(mm, block);
>>>> return ERR_PTR(err);
>>>> }
>>>> -EXPORT_SYMBOL(drm_buddy_alloc_blocks);
>>>> -
>>>> -static inline bool overlaps(u64 s1, u64 e1, u64 s2, u64 e2)
>>>> -{
>>>> - return s1 <= e2 && e1 >= s2;
>>>> -}
>>>> -
>>>> -static inline bool contains(u64 s1, u64 e1, u64 s2, u64 e2)
>>>> -{
>>>> - return s1 <= s2 && e1 >= e2;
>>>> -}
>>>>
>>>> -/**
>>>> - * drm_buddy_alloc_range - allocate range
>>>> - *
>>>> - * @mm: DRM buddy manager to allocate from
>>>> - * @blocks: output list head to add allocated blocks
>>>> - * @start: start of the allowed range for this block
>>>> - * @size: size of the allocation
>>>> - *
>>>> - * Intended for pre-allocating portions of the address space, for example to
>>>> - * reserve a block for the initial framebuffer or similar, hence the expectation
>>>> - * here is that drm_buddy_alloc_blocks() is still the main vehicle for
>>>> - * allocations, so if that's not the case then the drm_mm range allocator is
>>>> - * probably a much better fit, and so you should probably go use that instead.
>>>> - *
>>>> - * Note that it's safe to chain together multiple alloc_ranges
>>>> - * with the same blocks list
>>>> - *
>>>> - * Returns:
>>>> - * 0 on success, error code on failure.
>>>> - */
>>>> -int drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> - struct list_head *blocks,
>>>> - u64 start, u64 size)
>>>> +static int __alloc_range(struct drm_buddy *mm,
>>>> + struct list_head *dfs,
>>>> + u64 start, u64 size,
>>>> + struct list_head *blocks)
>>>> {
>>>> struct drm_buddy_block *block;
>>>> struct drm_buddy_block *buddy;
>>>> LIST_HEAD(allocated);
>>>> - LIST_HEAD(dfs);
>>>> u64 end;
>>>> int err;
>>>> - int i;
>>>> -
>>>> - if (size < mm->chunk_size)
>>>> - return -EINVAL;
>>>> -
>>>> - if (!IS_ALIGNED(size | start, mm->chunk_size))
>>>> - return -EINVAL;
>>>> -
>>>> - if (range_overflows(start, size, mm->size))
>>>> - return -EINVAL;
>>>> -
>>>> - for (i = 0; i < mm->n_roots; ++i)
>>>> - list_add_tail(&mm->roots[i]->tmp_link, &dfs);
>>>>
>>>> end = start + size - 1;
>>>>
>>>> @@ -399,7 +424,7 @@ int drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> u64 block_start;
>>>> u64 block_end;
>>>>
>>>> - block = list_first_entry_or_null(&dfs,
>>>> + block = list_first_entry_or_null(dfs,
>>>> struct drm_buddy_block,
>>>> tmp_link);
>>>> if (!block)
>>>> @@ -436,8 +461,8 @@ int drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> goto err_undo;
>>>> }
>>>>
>>>> - list_add(&block->right->tmp_link, &dfs);
>>>> - list_add(&block->left->tmp_link, &dfs);
>>>> + list_add(&block->right->tmp_link, dfs);
>>>> + list_add(&block->left->tmp_link, dfs);
>>>> } while (1);
>>>>
>>>> list_splice_tail(&allocated, blocks);
>>>> @@ -459,7 +484,120 @@ int drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> drm_buddy_free_list(mm, &allocated);
>>>> return err;
>>>> }
>>>> -EXPORT_SYMBOL(drm_buddy_alloc_range);
>>>> +
>>>> +static int __drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> + u64 start,
>>>> + u64 size,
>>>> + struct list_head *blocks)
>>>> +{
>>>> + LIST_HEAD(dfs);
>>>> + int i;
>>>> +
>>>> + for (i = 0; i < mm->n_roots; ++i)
>>>> + list_add_tail(&mm->roots[i]->tmp_link, &dfs);
>>>> +
>>>> + return __alloc_range(mm, &dfs, start, size, blocks);
>>>> +}
>>>> +
>>>> +/**
>>>> + * drm_buddy_alloc_blocks - allocate power-of-two blocks
>>>> + *
>>>> + * @mm: DRM buddy manager to allocate from
>>>> + * @start: start of the allowed range for this block
>>>> + * @end: end of the allowed range for this block
>>>> + * @size: size of the allocation
>>>> + * @min_page_size: alignment of the allocation
>>>> + * @blocks: output list head to add allocated blocks
>>>> + * @flags: DRM_BUDDY_*_ALLOCATION flags
>>>> + *
>>>> + * alloc_range_bias() called on range limitations, which traverses
>>>> + * the tree and returns the desired block.
>>>> + *
>>>> + * alloc_from_freelist() called when *no* range restrictions
>>>> + * are enforced, which picks the block from the freelist.
>>>> + *
>>>> + * Returns:
>>>> + * 0 on success, error code on failure.
>>>> + */
>>>> +int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>>>> + u64 start, u64 end, u64 size,
>>>> + u64 min_page_size,
>>>> + struct list_head *blocks,
>>>> + unsigned long flags)
>>>> +{
>>>> + struct drm_buddy_block *block = NULL;
>>>> + unsigned int min_order, order;
>>>> + unsigned long pages;
>>>> + LIST_HEAD(allocated);
>>>> + int err;
>>>> +
>>>> + if (size < mm->chunk_size)
>>>> + return -EINVAL;
>>>> +
>>>> + if (min_page_size < mm->chunk_size)
>>>> + return -EINVAL;
>>>> +
>>>> + if (!is_power_of_2(min_page_size))
>>>> + return -EINVAL;
>>>> +
>>>> + if (!IS_ALIGNED(start | end | size, mm->chunk_size))
>>>> + return -EINVAL;
>>>> +
>>>> + if (end > mm->size)
>>>> + return -EINVAL;
>>>> +
>>>> + if (range_overflows(start, size, mm->size))
>>>> + return -EINVAL;
>>>> +
>>>> + /* Actual range allocation */
>>>> + if (start + size == end)
>>>> + return __drm_buddy_alloc_range(mm, start, size, blocks);
>>>> +
>>>> + pages = size >> ilog2(mm->chunk_size);
>>>> + order = fls(pages) - 1;
>>>> + min_order = ilog2(min_page_size) - ilog2(mm->chunk_size);
>>>> +
>>>> + do {
>>>> + order = min(order, (unsigned int)fls(pages) - 1);
>>>> + BUG_ON(order > mm->max_order);
>>>> + BUG_ON(order < min_order);
>>>> +
>>>> + do {
>>>> + if (start || end != size)
>>>> + /* Allocate traversing within the range */
>>>> + block = alloc_range_bias(mm, start, end, order);
>>>> + else
>>>> + /* Allocate from freelist */
>>>> + block = alloc_from_freelist(mm, order, flags);
>>>> +
>>>> + if (!IS_ERR(block))
>>>> + break;
>>>> +
>>>> + if (order-- == min_order) {
>>>> + err = -ENOSPC;
>>>> + goto err_free;
>>>> + }
>>>> + } while (1);
>>>> +
>>>> + mark_allocated(block);
>>>> + mm->avail -= drm_buddy_block_size(mm, block);
>>>> + kmemleak_update_trace(block);
>>>> + list_add_tail(&block->link, &allocated);
>>>> +
>>>> + pages -= BIT(order);
>>>> +
>>>> + if (!pages)
>>>> + break;
>>>> + } while (1);
>>>> +
>>>> + list_splice_tail(&allocated, blocks);
>>>> + return 0;
>>>> +
>>>> +err_free:
>>>> + drm_buddy_free_list(mm, &allocated);
>>>> + return err;
>>>> +}
>>>> +EXPORT_SYMBOL(drm_buddy_alloc_blocks);
>>>>
>>>> /**
>>>> * drm_buddy_block_print - print block information
>>>> diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
>>>> index 247714bab044..7aef6ad9fe84 100644
>>>> --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
>>>> +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
>>>> @@ -36,13 +36,14 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
>>>> struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
>>>> struct i915_ttm_buddy_resource *bman_res;
>>>> struct drm_buddy *mm = &bman->mm;
>>>> - unsigned long n_pages;
>>>> - unsigned int min_order;
>>>> + unsigned long n_pages, lpfn;
>>>> u64 min_page_size;
>>>> u64 size;
>>>> int err;
>>>>
>>>> - GEM_BUG_ON(place->fpfn || place->lpfn);
>>>> + lpfn = place->lpfn;
>>>> + if (!lpfn)
>>>> + lpfn = man->size;
>>>>
>>>> bman_res = kzalloc(sizeof(*bman_res), GFP_KERNEL);
>>>> if (!bman_res)
>>>> @@ -60,10 +61,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
>>>> min_page_size = bo->page_alignment << PAGE_SHIFT;
>>>>
>>>> GEM_BUG_ON(min_page_size < mm->chunk_size);
>>>> - min_order = ilog2(min_page_size) - ilog2(mm->chunk_size);
>>>> +
>>>> if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
>>>> + unsigned long pages;
>>>> +
>>>> size = roundup_pow_of_two(size);
>>>> - min_order = ilog2(size) - ilog2(mm->chunk_size);
>>>> + min_page_size = size;
>>>> +
>>>> + pages = size >> ilog2(mm->chunk_size);
>>>> + if (pages > lpfn)
>>>> + lpfn = pages;
>>>> }
>>>>
>>>> if (size > mm->size) {
>>>> @@ -73,34 +80,16 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
>>>>
>>>> n_pages = size >> ilog2(mm->chunk_size);
>>>>
>>>> - do {
>>>> - struct drm_buddy_block *block;
>>>> - unsigned int order;
>>>> -
>>>> - order = fls(n_pages) - 1;
>>>> - GEM_BUG_ON(order > mm->max_order);
>>>> - GEM_BUG_ON(order < min_order);
>>>> -
>>>> - do {
>>>> - mutex_lock(&bman->lock);
>>>> - block = drm_buddy_alloc_blocks(mm, order);
>>>> - mutex_unlock(&bman->lock);
>>>> - if (!IS_ERR(block))
>>>> - break;
>>>> -
>>>> - if (order-- == min_order) {
>>>> - err = -ENOSPC;
>>>> - goto err_free_blocks;
>>>> - }
>>>> - } while (1);
>>>> -
>>>> - n_pages -= BIT(order);
>>>> -
>>>> - list_add_tail(&block->link, &bman_res->blocks);
>>>> -
>>>> - if (!n_pages)
>>>> - break;
>>>> - } while (1);
>>>> + mutex_lock(&bman->lock);
>>>> + err = drm_buddy_alloc_blocks(mm, (u64)place->fpfn << PAGE_SHIFT,
>>>> + (u64)lpfn << PAGE_SHIFT,
>>>> + (u64)n_pages << PAGE_SHIFT,
>>>> + min_page_size,
>>>> + &bman_res->blocks,
>>>> + bman_res->flags);
>>>> + mutex_unlock(&bman->lock);
>>>> + if (unlikely(err))
>>>> + goto err_free_blocks;
>>>>
>>>> *res = &bman_res->base;
>>>> return 0;
>>>> @@ -268,12 +257,16 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
>>>> {
>>>> struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
>>>> struct drm_buddy *mm = &bman->mm;
>>>> + unsigned long flags = 0;
>>>> int ret;
>>>>
>>>> mutex_lock(&bman->lock);
>>>> - ret = drm_buddy_alloc_range(mm, &bman->reserved, start, size);
>>>> + ret = drm_buddy_alloc_blocks(mm, start,
>>>> + start + size,
>>>> + size, mm->chunk_size,
>>>> + &bman->reserved,
>>>> + flags);
>>>> mutex_unlock(&bman->lock);
>>>>
>>>> return ret;
>>>> }
>>>> -
>>>> diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
>>>> index 312077941411..72c90b432e87 100644
>>>> --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
>>>> +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
>>>> @@ -20,6 +20,7 @@ struct drm_buddy;
>>>> *
>>>> * @base: struct ttm_resource base class we extend
>>>> * @blocks: the list of struct i915_buddy_block for this resource/allocation
>>>> + * @flags: DRM_BUDDY_*_ALLOCATION flags
>>>> * @mm: the struct i915_buddy_mm for this resource
>>>> *
>>>> * Extends the struct ttm_resource to manage an address space allocation with
>>>> @@ -28,6 +29,7 @@ struct drm_buddy;
>>>> struct i915_ttm_buddy_resource {
>>>> struct ttm_resource base;
>>>> struct list_head blocks;
>>>> + unsigned long flags;
>>>> struct drm_buddy *mm;
>>>> };
>>>>
>>>> diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
>>>> index f524db152413..1f2435426c69 100644
>>>> --- a/include/drm/drm_buddy.h
>>>> +++ b/include/drm/drm_buddy.h
>>>> @@ -131,12 +131,11 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size);
>>>>
>>>> void drm_buddy_fini(struct drm_buddy *mm);
>>>>
>>>> -struct drm_buddy_block *
>>>> -drm_buddy_alloc_blocks(struct drm_buddy *mm, unsigned int order);
>>>> -
>>>> -int drm_buddy_alloc_range(struct drm_buddy *mm,
>>>> - struct list_head *blocks,
>>>> - u64 start, u64 size);
>>>> +int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>>>> + u64 start, u64 end, u64 size,
>>>> + u64 min_page_size,
>>>> + struct list_head *blocks,
>>>> + unsigned long flags);
>>>>
>>>> void drm_buddy_free_block(struct drm_buddy *mm, struct drm_buddy_block *block);
>>>>
>
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