drm/ttm: cleanup and optimize ttm_bo_mem_compat v2
No need to implement the same logic twice. Also check if the busy placements
are identical to the already scanned placements before checking them.
v2: improve check even more as suggested by Michel.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 412240a..99d2a2c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1020,37 +1020,42 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
return ret;
}
+static bool ttm_bo_places_compat(const struct ttm_place *places,
+ unsigned num_placement,
+ struct ttm_mem_reg *mem,
+ uint32_t *new_flags)
+{
+ unsigned i;
+
+ for (i = 0; i < num_placement; i++) {
+ const struct ttm_place *heap = &places[i];
+
+ if (mem->mm_node && (mem->start < heap->fpfn ||
+ (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
+ continue;
+
+ *new_flags = heap->flags;
+ if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
+ (*new_flags & mem->placement & TTM_PL_MASK_MEM))
+ return true;
+ }
+ return false;
+}
+
bool ttm_bo_mem_compat(struct ttm_placement *placement,
struct ttm_mem_reg *mem,
uint32_t *new_flags)
{
- int i;
+ if (ttm_bo_places_compat(placement->placement, placement->num_placement,
+ mem, new_flags))
+ return true;
- for (i = 0; i < placement->num_placement; i++) {
- const struct ttm_place *heap = &placement->placement[i];
- if (mem->mm_node &&
- (mem->start < heap->fpfn ||
- (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
- continue;
-
- *new_flags = heap->flags;
- if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
- (*new_flags & mem->placement & TTM_PL_MASK_MEM))
- return true;
- }
-
- for (i = 0; i < placement->num_busy_placement; i++) {
- const struct ttm_place *heap = &placement->busy_placement[i];
- if (mem->mm_node &&
- (mem->start < heap->fpfn ||
- (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
- continue;
-
- *new_flags = heap->flags;
- if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
- (*new_flags & mem->placement & TTM_PL_MASK_MEM))
- return true;
- }
+ if ((placement->busy_placement != placement->placement ||
+ placement->num_busy_placement > placement->num_placement) &&
+ ttm_bo_places_compat(placement->busy_placement,
+ placement->num_busy_placement,
+ mem, new_flags))
+ return true;
return false;
}