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Commit 0f70c6b8 authored by Amit Nischal's avatar Amit Nischal
Browse files

clk: Add support to dump state of all clocks into ftrace 



Add clk_state event to record the state of all the clocks
into ftrace. The clock event could be triggered by using
the "trace_clocks" debugfs entry and it would dump the
current state of all clocks in ftrace logs.

Change-Id: I28b6574fe1d96472833a93e7b251dbba6c6eae49
Signed-off-by: default avatarAmit Nischal <anischal@codeaurora.org>
parent 1ccabf65

drivers/clk/clk.c

+55 −0
Original line number Diff line number Diff line
@@ -2326,6 +2326,56 @@ static struct hlist_head *orphan_list[] = { 
	NULL,

};



static void clk_state_subtree(struct clk_core *c)

{

	int vdd_level = 0;

	struct clk_core *child;



	if (!c)

		return;



	if (c->vdd_class) {

		vdd_level = clk_find_vdd_level(c, c->rate);

		if (vdd_level < 0)

			vdd_level = 0;

	}



	trace_clk_state(c->name, c->prepare_count, c->enable_count,

						c->rate, vdd_level);



	hlist_for_each_entry(child, &c->children, child_node)

		clk_state_subtree(child);

}



static int clk_state_show(struct seq_file *s, void *data)

{

	struct clk_core *c;

	struct hlist_head **lists = (struct hlist_head **)s->private;



	clk_prepare_lock();



	for (; *lists; lists++)

		hlist_for_each_entry(c, *lists, child_node)

			clk_state_subtree(c);



	clk_prepare_unlock();



	return 0;

}





static int clk_state_open(struct inode *inode, struct file *file)

{

	return single_open(file, clk_state_show, inode->i_private);

}



static const struct file_operations clk_state_fops = {

	.open		= clk_state_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static void clk_summary_show_one(struct seq_file *s, struct clk_core *c,

				 int level)

{
@@ -3002,6 +3052,11 @@ static int __init clk_debug_init(void) 
	if (!d)

		return -ENOMEM;



	d = debugfs_create_file("trace_clocks", S_IRUGO, rootdir, &all_lists,

				&clk_state_fops);

	if (!d)

		return -ENOMEM;



	mutex_lock(&clk_debug_lock);

	hlist_for_each_entry(core, &clk_debug_list, debug_node)

		clk_debug_create_one(core, rootdir);

include/trace/events/clk.h

+37 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and
@@ -192,6 +192,42 @@ DEFINE_EVENT(clk_phase, clk_set_phase_complete, 
	TP_ARGS(core, phase)

);



DECLARE_EVENT_CLASS(clk_state_dump,



	TP_PROTO(const char *name, unsigned int prepare_count,

	unsigned int enable_count, unsigned long rate, unsigned int vdd_level),



	TP_ARGS(name, prepare_count, enable_count, rate, vdd_level),



	TP_STRUCT__entry(

		__string(name,			name)

		__field(unsigned int,		prepare_count)

		__field(unsigned int,		enable_count)

		__field(unsigned long,		rate)

		__field(unsigned int,		vdd_level)

	),



	TP_fast_assign(

		__assign_str(name, name);

		__entry->prepare_count = prepare_count;

		__entry->enable_count = enable_count;

		__entry->rate = rate;

		__entry->vdd_level = vdd_level;

	),



	TP_printk("%s\tprepare:enable cnt [%u:%u]\trate: vdd_level [%lu:%u]",

		__get_str(name), __entry->prepare_count, __entry->enable_count,

		__entry->rate, __entry->vdd_level)

);



DEFINE_EVENT(clk_state_dump, clk_state,



	TP_PROTO(const char *name, unsigned int prepare_count,

	unsigned int enable_count, unsigned long rate, unsigned int vdd_level),



	TP_ARGS(name, prepare_count, enable_count, rate, vdd_level)

);



#endif /* _TRACE_CLK_H */



/* This part must be outside protection */