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drm/amdgpu: optimize VRAM allocation when using drm buddy

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Since the VRAM manager changed from drm mm to drm buddy. It's
not necessary to allocate 2MB aligned VRAM for more than 2MB
unaligned size, and then do trim. This method improves the
allocation efficiency and reduces memory fragmentation.

v2: Correct the remainder operation

Signed-off-by: Shane Xiao <shane.xiao@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shane Xiao 2023-02-18 11:58:45 +08:00 committed by Alex Deucher
parent c105518679
commit 2866cc0961
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
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@ -453,7 +453,8 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
/* Limit maximum size to 2GiB due to SG table limitations */
size = min(remaining_size, 2ULL << 30);
if (size >= (u64)pages_per_block << PAGE_SHIFT)
if ((size >= (u64)pages_per_block << PAGE_SHIFT) &&
!(size & (((u64)pages_per_block << PAGE_SHIFT) - 1)))
min_block_size = (u64)pages_per_block << PAGE_SHIFT;
cur_size = size;