drm/mm: add ability to dump mm lists via debugfs
This adds code to the drm_mm to talk to debugfs, and adds
support to radeon to add the VRAM and GTT mm lists to debugfs.
I tested with spinlock debugging and it doesn't give out.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 3e47869..c861d80 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -44,6 +44,7 @@
#include "drmP.h"
#include "drm_mm.h"
#include <linux/slab.h>
+#include <linux/seq_file.h>
#define MM_UNUSED_TARGET 4
@@ -370,3 +371,23 @@
BUG_ON(mm->num_unused != 0);
}
EXPORT_SYMBOL(drm_mm_takedown);
+
+#if defined(CONFIG_DEBUG_FS)
+int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
+{
+ struct drm_mm_node *entry;
+ int total_used = 0, total_free = 0, total = 0;
+
+ list_for_each_entry(entry, &mm->ml_entry, ml_entry) {
+ seq_printf(m, "0x%08lx-0x%08lx: 0x%08lx: %s\n", 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;
+ }
+ seq_printf(m, "total: %d, used %d free %d\n", total, total_free, total_used);
+ return 0;
+}
+EXPORT_SYMBOL(drm_mm_dump_table);
+#endif