[PATCH 22/31] drm: Compile time enabling for asserts in drm_mm

[Chris Wilson]

Use CONFIG_DRM_DEBUG_MM to conditionally enable the internal and
validation checking using BUG_ON. Ideally these paths should all be
exercised by CI selftests (with the asserts enabled).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_mm.c | 45 ++++++++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 7479b908dd08..0c32da9e3b99 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -91,6 +91,12 @@
  * some basic allocator dumpers for debugging.
  */
 
+#ifdef CONFIG_DRM_DEBUG_MM
+#define MM_BUG_ON(expr) BUG_ON(expr)
+#else
+#define MM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
+#endif
+
 static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
 						u64 size,
 						u64 alignment,
@@ -237,7 +243,7 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
 	u64 adj_start = hole_start;
 	u64 adj_end = hole_end;
 
-	BUG_ON(node->allocated);
+	MM_BUG_ON(node->allocated);
 
 	if (mm->color_adjust)
 		mm->color_adjust(hole_node, color, &adj_start, &adj_end);
@@ -257,8 +263,8 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
 		}
 	}
 
-	BUG_ON(adj_start < hole_start);
-	BUG_ON(adj_end > hole_end);
+	MM_BUG_ON(adj_start < hole_start);
+	MM_BUG_ON(adj_end > hole_end);
 
 	if (adj_start == hole_start) {
 		hole_node->hole_follows = 0;
@@ -275,7 +281,7 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
 
 	drm_mm_interval_tree_add_node(hole_node, node);
 
-	BUG_ON(node->start + node->size > adj_end);
+	MM_BUG_ON(node->start + node->size > adj_end);
 
 	node->hole_follows = 0;
 	if (__drm_mm_hole_node_start(node) < hole_end) {
@@ -408,7 +414,7 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
 	u64 adj_start = hole_start;
 	u64 adj_end = hole_end;
 
-	BUG_ON(!hole_node->hole_follows || node->allocated);
+	MM_BUG_ON(!hole_node->hole_follows || node->allocated);
 
 	if (adj_start < start)
 		adj_start = start;
@@ -448,10 +454,10 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
 
 	drm_mm_interval_tree_add_node(hole_node, node);
 
-	BUG_ON(node->start < start);
-	BUG_ON(node->start < adj_start);
-	BUG_ON(node->start + node->size > adj_end);
-	BUG_ON(node->start + node->size > end);
+	MM_BUG_ON(node->start < start);
+	MM_BUG_ON(node->start < adj_start);
+	MM_BUG_ON(node->start + node->size > adj_end);
+	MM_BUG_ON(node->start + node->size > end);
 
 	node->hole_follows = 0;
 	if (__drm_mm_hole_node_start(node) < hole_end) {
@@ -520,19 +526,20 @@ void drm_mm_remove_node(struct drm_mm_node *node)
 	if (WARN_ON(!node->allocated))
 		return;
 
-	BUG_ON(node->scanned_block || node->scanned_prev_free
-				   || node->scanned_next_free);
+	MM_BUG_ON(node->scanned_block ||
+		  node->scanned_prev_free ||
+		  node->scanned_next_free);
 
 	prev_node =
 	    list_entry(node->node_list.prev, struct drm_mm_node, node_list);
 
 	if (node->hole_follows) {
-		BUG_ON(__drm_mm_hole_node_start(node) ==
-		       __drm_mm_hole_node_end(node));
+		MM_BUG_ON(__drm_mm_hole_node_start(node) ==
+			  __drm_mm_hole_node_end(node));
 		list_del(&node->hole_stack);
 	} else
-		BUG_ON(__drm_mm_hole_node_start(node) !=
-		       __drm_mm_hole_node_end(node));
+		MM_BUG_ON(__drm_mm_hole_node_start(node) !=
+			  __drm_mm_hole_node_end(node));
 
 
 	if (!prev_node->hole_follows) {
@@ -575,7 +582,7 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
 	u64 adj_end;
 	u64 best_size;
 
-	BUG_ON(mm->scanned_blocks);
+	MM_BUG_ON(mm->scanned_blocks);
 
 	best = NULL;
 	best_size = ~0UL;
@@ -619,7 +626,7 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
 	u64 adj_end;
 	u64 best_size;
 
-	BUG_ON(mm->scanned_blocks);
+	MM_BUG_ON(mm->scanned_blocks);
 
 	best = NULL;
 	best_size = ~0UL;
@@ -795,7 +802,7 @@ bool drm_mm_scan_add_block(struct drm_mm_node *node)
 
 	mm->scanned_blocks++;
 
-	BUG_ON(node->scanned_block);
+	MM_BUG_ON(node->scanned_block);
 	node->scanned_block = 1;
 
 	prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
@@ -856,7 +863,7 @@ bool drm_mm_scan_remove_block(struct drm_mm_node *node)
 
 	mm->scanned_blocks--;
 
-	BUG_ON(!node->scanned_block);
+	MM_BUG_ON(!node->scanned_block);
 	node->scanned_block = 0;
 
 	prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
-- 
2.11.0