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drm/xe: Change return type of detect_bar2_dgfx() from s64 to u64

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The function never returns a negative value, and the return value is
assigned to a u64 variable. Use u64 for better type correctness
and clarity.

v2: add assert to catch theoretical negative or zero stolen size. (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Link: https://lore.kernel.org/r/20251009230239.2830207-8-shuicheng.lin@intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Shuicheng Lin
2025-10-09 23:02:30 +00:00
committed by Rodrigo Vivi
parent 0145a99eac
commit 65369b8e29
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c
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@@ -81,7 +81,7 @@ static u32 get_wopcm_size(struct xe_device *xe)
return wopcm_size;
}
static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
static u64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
{
struct xe_vram_region *tile_vram = xe_device_get_root_tile(xe)->mem.vram;
resource_size_t tile_io_start = xe_vram_region_io_start(tile_vram);
@@ -105,6 +105,8 @@ static s64 detect_bar2_dgfx(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
return 0;
stolen_size = tile_size - mgr->stolen_base;
xe_assert(xe, stolen_size > wopcm_size);
stolen_size -= wopcm_size;
/* Verify usage fits in the actual resource available */