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regmap: Provide debugfs dump of the rbtree cache data

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Show the register ranges we have in each rbtree node in debugfs, plus
some statistics on how big each node is and the total number of nodes.
It may also be worth collecting data on the ranges of dirty registers
to see if there's much mileage in trying to coalesce writes on sync.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2011-11-21 19:44:44 +00:00
parent 052d2cd123
commit bad2ab4b6d
1 changed files with 49 additions and 0 deletions
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49
drivers/base/regmap/regcache-rbtree.c
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@ -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: