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    Subject[PATCH AUTOSEL 5.5 382/542] PM / devfreq: Add debugfs support with devfreq_summary file
    Date
    From: Chanwoo Choi <cw00.choi@samsung.com>

    [ Upstream commit 490a421bc575d1bf391a6ad5b582dcfbd0037724 ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/devfreq/devfreq.c | 82 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 82 insertions(+)

    diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
    index 554d155106a5f..e99f082d15df5 100644
    --- a/drivers/devfreq/devfreq.c
    +++ b/drivers/devfreq/devfreq.c
    @@ -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
    @@ -1614,6 +1616,81 @@ 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");
    @@ -1630,6 +1707,11 @@ 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);
    --
    2.20.1
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