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drm/gpu: Add gpu_buddy_allocated_addr_to_block helper

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Add helper with primary purpose is to efficiently trace a specific
physical memory address back to its corresponding TTM buffer object.

v3:
- use mm->chunk_size minimum allocation granularity (Arun)
v2:
- %s/gpu_buddy_addr_to_block/gpu_buddy_allocated_addr_to_block(MattA)
- remove clear->avail and split nodes check(MattA)
- Adapt lockdep(MattB)

Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Cc: Arunpravin Paneer Selvam <arunpravin.paneerselvam@amd.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Link: https://patch.msgid.link/20260806053624.3215216-5-tejas.upadhyay@intel.com
This commit is contained in:
Tejas Upadhyay 2026-08-06 11:06:25 +05:30 committed by Arunpravin Paneer Selvam
parent 0ba6deddaa
commit 151ebbc20a
2 changed files with 55 additions and 0 deletions
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53
drivers/gpu/buddy.c
View File

@ -630,6 +630,59 @@ void gpu_buddy_free_block(struct gpu_buddy *mm,
}
EXPORT_SYMBOL(gpu_buddy_free_block);
/**
* gpu_buddy_allocated_addr_to_block - given relative address find the allocated block
*
* @mm: GPU buddy manager
* @addr: Relative address
*
* Returns:
* gpu_buddy_block on success, NULL or error code on failure
*/
struct gpu_buddy_block *gpu_buddy_allocated_addr_to_block(struct gpu_buddy *mm, u64 addr)
{
struct gpu_buddy_block *block;
LIST_HEAD(dfs);
u64 end;
int i;
gpu_buddy_driver_lock_held(mm);
end = addr + mm->chunk_size - 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 gpu_buddy_block,
tmp_link);
if (!block)
break;
list_del(&block->tmp_link);
block_start = gpu_buddy_block_offset(block);
block_end = block_start + gpu_buddy_block_size(mm, block) - 1;
if (!overlaps(addr, end, block_start, block_end))
continue;
if (gpu_buddy_block_is_allocated(block))
return block;
else if (gpu_buddy_block_is_free(block))
return NULL;
list_add(&block->right->tmp_link, &dfs);
list_add(&block->left->tmp_link, &dfs);
} while (1);
return ERR_PTR(-ENXIO);
}
EXPORT_SYMBOL(gpu_buddy_allocated_addr_to_block);
static void __gpu_buddy_free_list(struct gpu_buddy *mm,
struct list_head *objects,
bool mark_clear,

2
include/linux/gpu_buddy.h
View File

@ -287,6 +287,8 @@ void gpu_buddy_reset_clear(struct gpu_buddy *mm, bool is_clear);
void gpu_buddy_free_block(struct gpu_buddy *mm, struct gpu_buddy_block *block);
struct gpu_buddy_block *gpu_buddy_allocated_addr_to_block(struct gpu_buddy *mm, u64 addr);
void gpu_buddy_free_list(struct gpu_buddy *mm,
struct list_head *objects,
unsigned int flags);