drm: Add memory manager debug function

drm_mm_debug_table will print the memory manager state
in table allowing to give a snapshot of the manager at
given point in time. Usefull for debugging.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index a5c2773ccf2..d7d7eac3ddd 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -469,6 +469,26 @@ void drm_mm_takedown(struct drm_mm * mm)
 }
 EXPORT_SYMBOL(drm_mm_takedown);
 
+void drm_mm_debug_table(struct drm_mm *mm, const char *prefix)
+{
+        struct drm_mm_node *entry;
+        int total_used = 0, total_free = 0, total = 0;
+
+        list_for_each_entry(entry, &mm->ml_entry, ml_entry) {
+                printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8ld: %s\n",
+                        prefix, entry->start, entry->start + entry->size,
+                        entry->size, entry->free ? "free" : "used");
+                total += entry->size;
+                if (entry->free)
+                        total_free += entry->size;
+                else
+                        total_used += entry->size;
+        }
+        printk(KERN_DEBUG "%s total: %d, used %d free %d\n", prefix, total,
+                total_used, total_free);
+}
+EXPORT_SYMBOL(drm_mm_debug_table);
+
 #if defined(CONFIG_DEBUG_FS)
 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
 {
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index b40b2f06203..4c10be39a43 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -133,6 +133,7 @@ static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
         return block->mm;
 }
 
+extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 #ifdef CONFIG_DEBUG_FS
 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 #endif