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clk: flatten clk tree in debugfs 

This patch flattens the clk tree in CCF debugfs. Instead of representing the
clocks and their hierarchy as a directory structure under
/sys/kernel/debug/clk, each clock gets a single directory directly under
/sys/kernel/debug/clk. The orphans directory is replaced by a file called
clk_orphan_summary.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Peter De Schrijver 2014-05-30 18:03:57 +03:00 committed by Mike Turquette
parent d8e53c3deb
commit 27b8d5f723
1 changed files with 35 additions and 79 deletions
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114
drivers/clk/clk.c
View File

@ -36,6 +36,17 @@ static HLIST_HEAD(clk_root_list);
static HLIST_HEAD(clk_orphan_list);
static LIST_HEAD(clk_notifier_list);
static struct hlist_head *all_lists[] = {
&clk_root_list,
&clk_orphan_list,
NULL,
};
static struct hlist_head *orphan_list[] = {
&clk_orphan_list,
NULL,
};
/*** locking ***/
static void clk_prepare_lock(void)
{
@ -98,7 +109,6 @@ static void clk_enable_unlock(unsigned long flags)
#include <linux/debugfs.h>
static struct dentry *rootdir;
static struct dentry *orphandir;
static int inited = 0;
static void clk_summary_show_one(struct seq_file *s, struct clk *c, int level)
@ -130,17 +140,16 @@ static void clk_summary_show_subtree(struct seq_file *s, struct clk *c,
static int clk_summary_show(struct seq_file *s, void *data)
{
struct clk *c;
struct hlist_head **lists = (struct hlist_head **)s->private;
seq_puts(s, " clock enable_cnt prepare_cnt rate accuracy\n");
seq_puts(s, "--------------------------------------------------------------------------------\n");
clk_prepare_lock();
hlist_for_each_entry(c, &clk_root_list, child_node)
clk_summary_show_subtree(s, c, 0);
hlist_for_each_entry(c, &clk_orphan_list, child_node)
clk_summary_show_subtree(s, c, 0);
for (; *lists; lists++)
hlist_for_each_entry(c, *lists, child_node)
clk_summary_show_subtree(s, c, 0);
clk_prepare_unlock();
@ -193,21 +202,19 @@ static int clk_dump(struct seq_file *s, void *data)
{
struct clk *c;
bool first_node = true;
struct hlist_head **lists = (struct hlist_head **)s->private;
seq_printf(s, "{");
clk_prepare_lock();
hlist_for_each_entry(c, &clk_root_list, child_node) {
if (!first_node)
seq_printf(s, ",");
first_node = false;
clk_dump_subtree(s, c, 0);
}
hlist_for_each_entry(c, &clk_orphan_list, child_node) {
seq_printf(s, ",");
clk_dump_subtree(s, c, 0);
for (; *lists; lists++) {
hlist_for_each_entry(c, *lists, child_node) {
if (!first_node)
seq_puts(s, ",");
first_node = false;
clk_dump_subtree(s, c, 0);
}
}
clk_prepare_unlock();
@ -305,7 +312,7 @@ static int clk_debug_create_subtree(struct clk *clk, struct dentry *pdentry)
goto out;
hlist_for_each_entry(child, &clk->children, child_node)
clk_debug_create_subtree(child, clk->dentry);
clk_debug_create_subtree(child, pdentry);
ret = 0;
out:
@ -325,31 +332,12 @@ out:
*/
static int clk_debug_register(struct clk *clk)
{
struct clk *parent;
struct dentry *pdentry;
int ret = 0;
if (!inited)
goto out;
parent = clk->parent;
/*
* Check to see if a clk is a root clk. Also check that it is
* safe to add this clk to debugfs
*/
if (!parent)
if (clk->flags & CLK_IS_ROOT)
pdentry = rootdir;
else
pdentry = orphandir;
else
if (parent->dentry)
pdentry = parent->dentry;
else
goto out;
ret = clk_debug_create_subtree(clk, pdentry);
ret = clk_debug_create_subtree(clk, rootdir);
out:
return ret;
@ -370,39 +358,6 @@ static void clk_debug_unregister(struct clk *clk)
debugfs_remove_recursive(clk->dentry);
}
/**
* clk_debug_reparent - reparent clk node in the debugfs clk tree
* @clk: the clk being reparented
* @new_parent: the new clk parent, may be NULL
*
* Rename clk entry in the debugfs clk tree if debugfs has been
* initialized. Otherwise it bails out early since the debugfs clk tree
* will be created lazily by clk_debug_init as part of a late_initcall.
*
* Caller must hold prepare_lock.
*/
static void clk_debug_reparent(struct clk *clk, struct clk *new_parent)
{
struct dentry *d;
struct dentry *new_parent_d;
if (!inited)
return;
if (new_parent)
new_parent_d = new_parent->dentry;
else
new_parent_d = orphandir;
d = debugfs_rename(clk->dentry->d_parent, clk->dentry,
new_parent_d, clk->name);
if (d)
clk->dentry = d;
else
pr_debug("%s: failed to rename debugfs entry for %s\n",
__func__, clk->name);
}
/**
* clk_debug_init - lazily create the debugfs clk tree visualization
*
@ -425,19 +380,24 @@ static int __init clk_debug_init(void)
if (!rootdir)
return -ENOMEM;
d = debugfs_create_file("clk_summary", S_IRUGO, rootdir, NULL,
d = debugfs_create_file("clk_summary", S_IRUGO, rootdir, &all_lists,
&clk_summary_fops);
if (!d)
return -ENOMEM;
d = debugfs_create_file("clk_dump", S_IRUGO, rootdir, NULL,
d = debugfs_create_file("clk_dump", S_IRUGO, rootdir, &all_lists,
&clk_dump_fops);
if (!d)
return -ENOMEM;
orphandir = debugfs_create_dir("orphans", rootdir);
d = debugfs_create_file("clk_orphan_summary", S_IRUGO, rootdir,
&orphan_list, &clk_summary_fops);
if (!d)
return -ENOMEM;
if (!orphandir)
d = debugfs_create_file("clk_orphan_dump", S_IRUGO, rootdir,
&orphan_list, &clk_dump_fops);
if (!d)
return -ENOMEM;
clk_prepare_lock();
@ -446,7 +406,7 @@ static int __init clk_debug_init(void)
clk_debug_create_subtree(clk, rootdir);
hlist_for_each_entry(clk, &clk_orphan_list, child_node)
clk_debug_create_subtree(clk, orphandir);
clk_debug_create_subtree(clk, rootdir);
inited = 1;
@ -1284,9 +1244,6 @@ static void __clk_set_parent_after(struct clk *clk, struct clk *parent,
clk_disable(old_parent);
__clk_unprepare(old_parent);
}
/* update debugfs with new clk tree topology */
clk_debug_reparent(clk, parent);
}
static int __clk_set_parent(struct clk *clk, struct clk *parent, u8 p_index)
@ -1683,7 +1640,6 @@ out:
void __clk_reparent(struct clk *clk, struct clk *new_parent)
{
clk_reparent(clk, new_parent);
clk_debug_reparent(clk, new_parent);
__clk_recalc_accuracies(clk);
__clk_recalc_rates(clk, POST_RATE_CHANGE);
}