regmap: rbtree Expose total memory consumption in the rbtree debugfs entry

Provide a feel of how much overhead the rbtree cache adds to
the game.

[Slightly reworded output in debugfs -- broonie]

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 461cff888bb1..045319615608 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -138,15 +138,20 @@ static int rbtree_show(struct seq_file *s, void *ignored)
         struct regcache_rbtree_node *n;
         struct rb_node *node;
         unsigned int base, top;
+        size_t mem_size;
         int nodes = 0;
         int registers = 0;
         int this_registers, average;
 
         map->lock(map);
 
+        mem_size = sizeof(*rbtree_ctx);
+
         for (node = rb_first(&rbtree_ctx->root); node != NULL;
              node = rb_next(node)) {
                 n = container_of(node, struct regcache_rbtree_node, node);
+                mem_size += sizeof(*n);
+                mem_size += (n->blklen * map->cache_word_size);
 
                 regcache_rbtree_get_base_top_reg(map, n, &base, &top);
                 this_registers = ((top - base) / map->reg_stride) + 1;
@@ -161,8 +166,8 @@ static int rbtree_show(struct seq_file *s, void *ignored)
         else
                 average = 0;
 
-        seq_printf(s, "%d nodes, %d registers, average %d registers\n",
-                   nodes, registers, average);
+        seq_printf(s, "%d nodes, %d registers, average %d registers, used %zu bytes\n",
+                   nodes, registers, average, mem_size);
 
         map->unlock(map);