PM / devfreq: Add debugfs support with devfreq_summary file
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>
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Chanwoo Choi
parent
91d7f3f8f1
commit
490a421bc5
@ -10,6 +10,7 @@
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/init.h>
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@ -33,6 +34,7 @@
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#define HZ_PER_KHZ 1000
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static struct class *devfreq_class;
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static struct dentry *devfreq_debugfs;
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/*
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* devfreq core provides delayed work based load monitoring helper
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@ -1643,6 +1645,81 @@ static struct attribute *devfreq_attrs[] = {
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};
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ATTRIBUTE_GROUPS(devfreq);
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/**
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* devfreq_summary_show() - Show the summary of the devfreq devices
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* @s: seq_file instance to show the summary of devfreq devices
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* @data: not used
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*
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* Show the summary of the devfreq devices via 'devfreq_summary' debugfs file.
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* It helps that user can know the detailed information of the devfreq devices.
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*
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* Return 0 always because it shows the information without any data change.
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*/
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static int devfreq_summary_show(struct seq_file *s, void *data)
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{
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struct devfreq *devfreq;
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struct devfreq *p_devfreq = NULL;
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unsigned long cur_freq, min_freq, max_freq;
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unsigned int polling_ms;
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seq_printf(s, "%-30s %-10s %-10s %-15s %10s %12s %12s %12s\n",
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"dev_name",
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"dev",
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"parent_dev",
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"governor",
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"polling_ms",
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"cur_freq_Hz",
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"min_freq_Hz",
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"max_freq_Hz");
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seq_printf(s, "%30s %10s %10s %15s %10s %12s %12s %12s\n",
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"------------------------------",
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"----------",
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"----------",
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"---------------",
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"----------",
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"------------",
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"------------",
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"------------");
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mutex_lock(&devfreq_list_lock);
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list_for_each_entry_reverse(devfreq, &devfreq_list, node) {
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#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
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if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE,
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DEVFREQ_NAME_LEN)) {
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struct devfreq_passive_data *data = devfreq->data;
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if (data)
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p_devfreq = data->parent;
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} else {
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p_devfreq = NULL;
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}
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#endif
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mutex_lock(&devfreq->lock);
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cur_freq = devfreq->previous_freq,
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get_freq_range(devfreq, &min_freq, &max_freq);
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polling_ms = devfreq->profile->polling_ms,
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mutex_unlock(&devfreq->lock);
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seq_printf(s,
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"%-30s %-10s %-10s %-15s %10d %12ld %12ld %12ld\n",
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dev_name(devfreq->dev.parent),
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dev_name(&devfreq->dev),
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p_devfreq ? dev_name(&p_devfreq->dev) : "null",
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devfreq->governor_name,
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polling_ms,
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cur_freq,
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min_freq,
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max_freq);
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}
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mutex_unlock(&devfreq_list_lock);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(devfreq_summary);
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static int __init devfreq_init(void)
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{
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devfreq_class = class_create(THIS_MODULE, "devfreq");
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@ -1659,6 +1736,11 @@ static int __init devfreq_init(void)
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}
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devfreq_class->dev_groups = devfreq_groups;
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devfreq_debugfs = debugfs_create_dir("devfreq", NULL);
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debugfs_create_file("devfreq_summary", 0444,
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devfreq_debugfs, NULL,
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&devfreq_summary_fops);
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return 0;
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}
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subsys_initcall(devfreq_init);
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