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path: root/drivers/base/regmap/regmap-debugfs.c
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Diffstat (limited to 'drivers/base/regmap/regmap-debugfs.c')
-rw-r--r--drivers/base/regmap/regmap-debugfs.c67
1 files changed, 53 insertions, 14 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 749a1dc..07aad78 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -65,25 +65,53 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
loff_t from,
loff_t *pos)
{
- loff_t p = *pos;
- unsigned int i;
-
- for (i = base; i <= map->max_register; i += map->reg_stride) {
- if (!regmap_readable(map, i))
- continue;
-
- if (regmap_precious(map, i))
- continue;
+ struct regmap_debugfs_off_cache *c = NULL;
+ loff_t p = 0;
+ unsigned int i, ret;
+
+ /*
+ * If we don't have a cache build one so we don't have to do a
+ * linear scan each time.
+ */
+ if (list_empty(&map->debugfs_off_cache)) {
+ for (i = base; i <= map->max_register; i += map->reg_stride) {
+ /* Skip unprinted registers, closing off cache entry */
+ if (!regmap_readable(map, i) ||
+ regmap_precious(map, i)) {
+ if (c) {
+ c->max = p - 1;
+ list_add_tail(&c->list,
+ &map->debugfs_off_cache);
+ c = NULL;
+ }
+
+ continue;
+ }
+
+ /* No cache entry? Start a new one */
+ if (!c) {
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ break;
+ c->min = p;
+ c->base_reg = i;
+ }
+
+ p += map->debugfs_tot_len;
+ }
+ }
- if (i >= from) {
- *pos = p;
- return i;
+ /* Find the relevant block */
+ list_for_each_entry(c, &map->debugfs_off_cache, list) {
+ if (*pos >= c->min && *pos <= c->max) {
+ *pos = c->min;
+ return c->base_reg;
}
- p += map->debugfs_tot_len;
+ ret = c->max;
}
- return base;
+ return ret;
}
static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
@@ -309,6 +337,8 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
struct rb_node *next;
struct regmap_range_node *range_node;
+ INIT_LIST_HEAD(&map->debugfs_off_cache);
+
if (name) {
map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
dev_name(map->dev), name);
@@ -357,7 +387,16 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
void regmap_debugfs_exit(struct regmap *map)
{
+ struct regmap_debugfs_off_cache *c;
+
debugfs_remove_recursive(map->debugfs);
+ while (!list_empty(&map->debugfs_off_cache)) {
+ c = list_first_entry(&map->debugfs_off_cache,
+ struct regmap_debugfs_off_cache,
+ list);
+ list_del(&c->list);
+ kfree(c);
+ }
kfree(map->debugfs_name);
}