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-rw-r--r--drivers/base/regmap/regcache-rbtree.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index e71320f..7767cbb 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -11,7 +11,9 @@
*/
#include <linux/slab.h>
+#include <linux/debugfs.h>
#include <linux/rbtree.h>
+#include <linux/seq_file.h>
#include "internal.h"
@@ -125,6 +127,51 @@ static int regcache_rbtree_insert(struct rb_root *root,
return 1;
}
+#ifdef CONFIG_DEBUG_FS
+static int rbtree_show(struct seq_file *s, void *ignored)
+{
+ struct regmap *map = s->private;
+ struct regcache_rbtree_ctx *rbtree_ctx = map->cache;
+ struct regcache_rbtree_node *n;
+ struct rb_node *node;
+ unsigned int base, top;
+ int nodes = 0;
+ int registers = 0;
+
+ mutex_lock(&map->lock);
+
+ for (node = rb_first(&rbtree_ctx->root); node != NULL;
+ node = rb_next(node)) {
+ n = container_of(node, struct regcache_rbtree_node, node);
+
+ regcache_rbtree_get_base_top_reg(n, &base, &top);
+ seq_printf(s, "%x-%x (%d)\n", base, top, top - base + 1);
+
+ nodes++;
+ registers += top - base + 1;
+ }
+
+ seq_printf(s, "%d nodes, %d registers, average %d registers\n",
+ nodes, registers, registers / nodes);
+
+ mutex_unlock(&map->lock);
+
+ return 0;
+}
+
+static int rbtree_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rbtree_show, inode->i_private);
+}
+
+static const struct file_operations rbtree_fops = {
+ .open = rbtree_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif
+
static int regcache_rbtree_init(struct regmap *map)
{
struct regcache_rbtree_ctx *rbtree_ctx;
@@ -147,6 +194,8 @@ static int regcache_rbtree_init(struct regmap *map)
goto err;
}
+ debugfs_create_file("rbtree", 0400, map->debugfs, map, &rbtree_fops);
+
return 0;
err:
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