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Commit bad2ab4b authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Provide debugfs dump of the rbtree cache data 



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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 052d2cd1

drivers/base/regmap/regcache-rbtree.c

+49 −0
Original line number Diff line number Diff line
@@ -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: