PM / devfreq: Add debugfs support with devfreq_summary file (490a421b) · Commits · 戴 / test

Add debugfs interface to provide debugging information of devfreq device. It contains 'devfreq_summary' entry to show the summary of registered devfreq devices as following and the additional debugfs file will be added. - /sys/kernel/debug/devfreq/devfreq_summary [Detailed description of each field of 'devfreq_summary' debugfs file] - dev_name : Device name of h/w - dev : Device name made by devfreq core - parent_dev : If devfreq device uses the passive governor, show parent devfreq device name. Otherwise, show 'null'. - governor : Devfreq governor name - polling_ms : If devfreq device uses the simple_ondemand governor, polling_ms is necessary for the period. (unit: millisecond) - cur_freq_Hz : Current frequency (unit: Hz) - min_freq_Hz : Minimum frequency (unit: Hz) - max_freq_Hz : Maximum frequency (unit: Hz) [For example on Exynos5422-based Odroid-XU3 board] $ cat /sys/kernel/debug/devfreq/devfreq_summary dev_name dev parent_dev governor polling_ms cur_freq_Hz min_freq_Hz max_freq_Hz ------------------------------ ---------- ---------- --------------- ---------- ------------ ------------ ------------ 10c20000.memory-controller devfreq0 null simple_ondemand 0 165000000 165000000 825000000 soc:bus_wcore devfreq1 null simple_ondemand 50 532000000 88700000 532000000 soc:bus_noc devfreq2 devfreq1 passive 0 111000000 66600000 111000000 soc:bus_fsys_apb devfreq3 devfreq1 passive 0 222000000 111000000 222000000 soc:bus_fsys devfreq4 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_fsys2 devfreq5 devfreq1 passive 0 200000000 75000000 200000000 soc:bus_mfc devfreq6 devfreq1 passive 0 333000000 83250000 333000000 soc:bus_gen devfreq7 devfreq1 passive 0 266000000 88700000 266000000 soc:bus_peri devfreq8 devfreq1 passive 0 66600000 66600000 66600000 soc:bus_g2d devfreq9 devfreq1 passive 0 333000000 83250000 333000000 soc:bus_g2d_acp devfreq10 devfreq1 passive 0 266000000 66500000 266000000 soc:bus_jpeg devfreq11 devfreq1 passive 0 300000000 75000000 300000000 soc:bus_jpeg_apb devfreq12 devfreq1 passive 0 166500000 83250000 166500000 soc:bus_disp1_fimd devfreq13 devfreq1 passive 0 200000000 120000000 200000000 soc:bus_disp1 devfreq14 devfreq1 passive 0 300000000 120000000 300000000 soc:bus_gscl_scaler devfreq15 devfreq1 passive 0 300000000 150000000 300000000 soc:bus_mscl devfreq16 devfreq1 passive 0 666000000 84000000 666000000 [lkp: Reported the build error] Reported-by:

kbuild test robot <lkp@intel.com> Signed-off-by:

Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/devfreq.c

+82 −0

Original line number	Diff line number	Diff line
		@@ -10,6 +10,7 @@
		#include <linux/kernel.h>
		#include <linux/kmod.h>
		#include <linux/sched.h>
		#include <linux/debugfs.h>
		#include <linux/errno.h>
		#include <linux/err.h>
		#include <linux/init.h>
		@@ -33,6 +34,7 @@
		#define HZ_PER_KHZ 1000

		static struct class *devfreq_class;
		static struct dentry *devfreq_debugfs;

		/*
		* devfreq core provides delayed work based load monitoring helper
		@@ -1643,6 +1645,81 @@ static struct attribute *devfreq_attrs[] = {
		};
		ATTRIBUTE_GROUPS(devfreq);

		/**
		* devfreq_summary_show() - Show the summary of the devfreq devices
		* @s: seq_file instance to show the summary of devfreq devices
		* @data: not used
		*
		* Show the summary of the devfreq devices via 'devfreq_summary' debugfs file.
		* It helps that user can know the detailed information of the devfreq devices.
		*
		* Return 0 always because it shows the information without any data change.
		*/
		static int devfreq_summary_show(struct seq_file s, void data)
		{
		struct devfreq *devfreq;
		struct devfreq *p_devfreq = NULL;
		unsigned long cur_freq, min_freq, max_freq;
		unsigned int polling_ms;

		seq_printf(s, "%-30s %-10s %-10s %-15s %10s %12s %12s %12s\n",
		"dev_name",
		"dev",
		"parent_dev",
		"governor",
		"polling_ms",
		"cur_freq_Hz",
		"min_freq_Hz",
		"max_freq_Hz");
		seq_printf(s, "%30s %10s %10s %15s %10s %12s %12s %12s\n",
		"------------------------------",
		"----------",
		"----------",
		"---------------",
		"----------",
		"------------",
		"------------",
		"------------");

		mutex_lock(&devfreq_list_lock);

		list_for_each_entry_reverse(devfreq, &devfreq_list, node) {
		#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
		if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE,
		DEVFREQ_NAME_LEN)) {
		struct devfreq_passive_data *data = devfreq->data;

		if (data)
		p_devfreq = data->parent;
		} else {
		p_devfreq = NULL;
		}
		#endif

		mutex_lock(&devfreq->lock);
		cur_freq = devfreq->previous_freq,
		get_freq_range(devfreq, &min_freq, &max_freq);
		polling_ms = devfreq->profile->polling_ms,
		mutex_unlock(&devfreq->lock);

		seq_printf(s,
		"%-30s %-10s %-10s %-15s %10d %12ld %12ld %12ld\n",
		dev_name(devfreq->dev.parent),
		dev_name(&devfreq->dev),
		p_devfreq ? dev_name(&p_devfreq->dev) : "null",
		devfreq->governor_name,
		polling_ms,
		cur_freq,
		min_freq,
		max_freq);
		}

		mutex_unlock(&devfreq_list_lock);

		return 0;
		}
		DEFINE_SHOW_ATTRIBUTE(devfreq_summary);

		static int __init devfreq_init(void)
		{
		devfreq_class = class_create(THIS_MODULE, "devfreq");
		@@ -1659,6 +1736,11 @@ static int __init devfreq_init(void)
		}
		devfreq_class->dev_groups = devfreq_groups;

		devfreq_debugfs = debugfs_create_dir("devfreq", NULL);
		debugfs_create_file("devfreq_summary", 0444,
		devfreq_debugfs, NULL,
		&devfreq_summary_fops);

		return 0;
		}
		subsys_initcall(devfreq_init);

Admin message