drm: Compile time enabling for asserts in drm_mm

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@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-4-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-4-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 4257c86..9756542 100644 (file)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -237,7 +237,7 @@ 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);
+       DRM_MM_BUG_ON(node->allocated);
 
        if (mm->color_adjust)
                mm->color_adjust(hole_node, color, &adj_start, &adj_end);
@@ -258,8 +258,8 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
                }
        }
 
-       BUG_ON(adj_start < hole_start);
-       BUG_ON(adj_end > hole_end);
+       DRM_MM_BUG_ON(adj_start < hole_start);
+       DRM_MM_BUG_ON(adj_end > hole_end);
 
        if (adj_start == hole_start) {
                hole_node->hole_follows = 0;
@@ -276,7 +276,7 @@ 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);
+       DRM_MM_BUG_ON(node->start + node->size > adj_end);
 
        node->hole_follows = 0;
        if (__drm_mm_hole_node_start(node) < hole_end) {
@@ -409,7 +409,7 @@ 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);
+       DRM_MM_BUG_ON(!hole_node->hole_follows || node->allocated);
 
        if (adj_start < start)
                adj_start = start;
@@ -450,10 +450,10 @@ 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);
+       DRM_MM_BUG_ON(node->start < start);
+       DRM_MM_BUG_ON(node->start < adj_start);
+       DRM_MM_BUG_ON(node->start + node->size > adj_end);
+       DRM_MM_BUG_ON(node->start + node->size > end);
 
        node->hole_follows = 0;
        if (__drm_mm_hole_node_start(node) < hole_end) {
@@ -519,22 +519,21 @@ void drm_mm_remove_node(struct drm_mm_node *node)
        struct drm_mm *mm = node->mm;
        struct drm_mm_node *prev_node;
 
-       if (WARN_ON(!node->allocated))
-               return;
-
-       BUG_ON(node->scanned_block || node->scanned_prev_free
-                                  || node->scanned_next_free);
+       DRM_MM_BUG_ON(!node->allocated);
+       DRM_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));
+               DRM_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));
+               DRM_MM_BUG_ON(__drm_mm_hole_node_start(node) !=
+                             __drm_mm_hole_node_end(node));
 
 
        if (!prev_node->hole_follows) {
@@ -578,7 +577,7 @@ 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);
+       DRM_MM_BUG_ON(mm->scanned_blocks);
 
        best = NULL;
        best_size = ~0UL;
@@ -622,7 +621,7 @@ 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);
+       DRM_MM_BUG_ON(mm->scanned_blocks);
 
        best = NULL;
        best_size = ~0UL;
@@ -668,6 +667,8 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_
  */
 void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
 {
+       DRM_MM_BUG_ON(!old->allocated);
+
        list_replace(&old->node_list, &new->node_list);
        list_replace(&old->hole_stack, &new->hole_stack);
        rb_replace_node(&old->rb, &new->rb, &old->mm->interval_tree);
@@ -798,7 +799,7 @@ bool drm_mm_scan_add_block(struct drm_mm_node *node)
 
        mm->scanned_blocks++;
 
-       BUG_ON(node->scanned_block);
+       DRM_MM_BUG_ON(node->scanned_block);
        node->scanned_block = 1;
 
        prev_node = list_entry(node->node_list.prev, struct drm_mm_node,
@@ -859,7 +860,7 @@ bool drm_mm_scan_remove_block(struct drm_mm_node *node)
 
        mm->scanned_blocks--;
 
-       BUG_ON(!node->scanned_block);
+       DRM_MM_BUG_ON(!node->scanned_block);
        node->scanned_block = 0;
 
        prev_node = list_entry(node->node_list.prev, struct drm_mm_node,

diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index f6a68ed..5255430 100644 (file)
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -48,6 +48,12 @@
 #include <linux/stackdepot.h>
 #endif
 
+#ifdef CONFIG_DRM_DEBUG_MM
+#define DRM_MM_BUG_ON(expr) BUG_ON(expr)
+#else
+#define DRM_MM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
+#endif
+
 enum drm_mm_search_flags {
        DRM_MM_SEARCH_DEFAULT =         0,
        DRM_MM_SEARCH_BEST =            1 << 0,
@@ -155,7 +161,7 @@ static inline u64 __drm_mm_hole_node_start(const struct drm_mm_node *hole_node)
  */
 static inline u64 drm_mm_hole_node_start(const struct drm_mm_node *hole_node)
 {
-       BUG_ON(!hole_node->hole_follows);
+       DRM_MM_BUG_ON(!hole_node->hole_follows);
        return __drm_mm_hole_node_start(hole_node);
 }