From 2fee1a7cc6b1ce6634bb0f025be2c94a58dfa34d Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Tue, 5 Nov 2019 18:18:03 +0900 Subject: PM / devfreq: Add new name attribute for sysfs The commit 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs") changed the node name to devfreq(x). After this commit, it is not possible to get the device name through /sys/class/devfreq/devfreq(X)/*. Add new name attribute in order to get device name. Cc: stable@vger.kernel.org Fixes: 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs") Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 57f6944d65a6..07602083c743 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1259,6 +1259,14 @@ err_out: } EXPORT_SYMBOL(devfreq_remove_governor); +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct devfreq *devfreq = to_devfreq(dev); + return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent)); +} +static DEVICE_ATTR_RO(name); + static ssize_t governor_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1592,6 +1600,7 @@ static ssize_t trans_stat_show(struct device *dev, static DEVICE_ATTR_RO(trans_stat); static struct attribute *devfreq_attrs[] = { + &dev_attr_name.attr, &dev_attr_governor.attr, &dev_attr_available_governors.attr, &dev_attr_cur_freq.attr, -- cgit From b76b3479dab948bea0a98b6d263eb56d8f358528 Mon Sep 17 00:00:00 2001 From: Kamil Konieczny Date: Thu, 5 Dec 2019 15:55:25 +0100 Subject: PM / devfreq: Change time stats to 64-bit Change time stats counting to bigger type by using 64-bit jiffies. This will make devfreq stats code look similar to cpufreq stats and prevents overflow (for HZ = 1000 after 49.7 days). Signed-off-by: Kamil Konieczny Acked-by: Chanwoo Choi Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 14 +++++++------- include/linux/devfreq.h | 4 ++-- 2 files changed, 9 insertions(+), 9 deletions(-) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 07602083c743..554d155106a5 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -209,10 +209,10 @@ static int set_freq_table(struct devfreq *devfreq) int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) { int lev, prev_lev, ret = 0; - unsigned long cur_time; + u64 cur_time; lockdep_assert_held(&devfreq->lock); - cur_time = jiffies; + cur_time = get_jiffies_64(); /* Immediately exit if previous_freq is not initialized yet. */ if (!devfreq->previous_freq) @@ -535,7 +535,7 @@ void devfreq_monitor_resume(struct devfreq *devfreq) msecs_to_jiffies(devfreq->profile->polling_ms)); out_update: - devfreq->last_stat_updated = jiffies; + devfreq->last_stat_updated = get_jiffies_64(); devfreq->stop_polling = false; if (devfreq->profile->get_cur_freq && @@ -820,7 +820,7 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->time_in_state = devm_kcalloc(&devfreq->dev, devfreq->profile->max_state, - sizeof(unsigned long), + sizeof(*devfreq->time_in_state), GFP_KERNEL); if (!devfreq->time_in_state) { mutex_unlock(&devfreq->lock); @@ -828,7 +828,7 @@ struct devfreq *devfreq_add_device(struct device *dev, goto err_devfreq; } - devfreq->last_stat_updated = jiffies; + devfreq->last_stat_updated = get_jiffies_64(); srcu_init_notifier_head(&devfreq->transition_notifier_list); @@ -1589,8 +1589,8 @@ static ssize_t trans_stat_show(struct device *dev, for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", devfreq->trans_table[(i * max_state) + j]); - len += sprintf(buf + len, "%10u\n", - jiffies_to_msecs(devfreq->time_in_state[i])); + len += sprintf(buf + len, "%10llu\n", (u64) + jiffies64_to_msecs(devfreq->time_in_state[i])); } len += sprintf(buf + len, "Total transition : %u\n", diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index fb376b5b7281..95816a8e3d26 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -177,8 +177,8 @@ struct devfreq { /* information for device frequency transition */ unsigned int total_trans; unsigned int *trans_table; - unsigned long *time_in_state; - unsigned long last_stat_updated; + u64 *time_in_state; + u64 last_stat_updated; struct srcu_notifier_head transition_notifier_list; -- cgit From 14a34396819960865ff737c665c6e46b64d0e04a Mon Sep 17 00:00:00 2001 From: Kamil Konieczny Date: Thu, 5 Dec 2019 15:55:26 +0100 Subject: PM / devfreq: Add clearing transitions stats Add clearing transition table and time in states devfreq statistics by writing 0 (zero) to trans_stat file in devfreq sysfs. An example use is like following: echo 0 > /sys/class/devfreq/devfreqX/trans_stat Signed-off-by: Kamil Konieczny [cw00.choi: Edit return value if entering the wrong value for reset and use arrary3_size() to get the size of 3-dimensional array] Signed-off-by: Chanwoo Choi --- Documentation/ABI/testing/sysfs-class-devfreq | 11 ++++++---- drivers/devfreq/devfreq.c | 29 ++++++++++++++++++++++++++- 2 files changed, 35 insertions(+), 5 deletions(-) (limited to 'drivers/devfreq/devfreq.c') diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq index 75897e2fde43..9758eb85ade3 100644 --- a/Documentation/ABI/testing/sysfs-class-devfreq +++ b/Documentation/ABI/testing/sysfs-class-devfreq @@ -55,12 +55,15 @@ What: /sys/class/devfreq/.../trans_stat Date: October 2012 Contact: MyungJoo Ham Description: - This ABI shows the statistics of devfreq behavior on a - specific device. It shows the time spent in each state and - the number of transitions between states. + This ABI shows or clears the statistics of devfreq behavior + on a specific device. It shows the time spent in each state + and the number of transitions between states. In order to activate this ABI, the devfreq target device driver should provide the list of available frequencies - with its profile. + with its profile. If need to reset the statistics of devfreq + behavior on a specific device, enter 0(zero) to 'trans_stat' + as following: + echo 0 > /sys/class/devfreq/.../trans_stat What: /sys/class/devfreq/.../userspace/set_freq Date: September 2011 diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 554d155106a5..af5bd521a734 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1597,7 +1597,34 @@ static ssize_t trans_stat_show(struct device *dev, devfreq->total_trans); return len; } -static DEVICE_ATTR_RO(trans_stat); + +static ssize_t trans_stat_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct devfreq *df = to_devfreq(dev); + int err, value; + + if (df->profile->max_state == 0) + return count; + + err = kstrtoint(buf, 10, &value); + if (err || value != 0) + return -EINVAL; + + mutex_lock(&df->lock); + memset(df->time_in_state, 0, (df->profile->max_state * + sizeof(*df->time_in_state))); + memset(df->trans_table, 0, array3_size(sizeof(unsigned int), + df->profile->max_state, + df->profile->max_state)); + df->total_trans = 0; + df->last_stat_updated = get_jiffies_64(); + mutex_unlock(&df->lock); + + return count; +} +static DEVICE_ATTR_RW(trans_stat); static struct attribute *devfreq_attrs[] = { &dev_attr_name.attr, -- cgit From 1ebd0bc0e8adbfa548335d016ead922cc85fcecd Mon Sep 17 00:00:00 2001 From: Kamil Konieczny Date: Fri, 6 Dec 2019 13:46:39 +0900 Subject: PM / devfreq: Move statistics to separate struct devfreq_stats Count time and transitions between devfreq frequencies in separate struct devfreq_stats for improved code readability and maintenance. Signed-off-by: Kamil Konieczny Reviewed-by: Matthias Kaehlcke [cw00.choi: Fix the merge conflict in trasn_stat_store and use 'devfreq->stats.*' style for consistent coding style and restore the clean-up code of 'devfreq->profile->*'] Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 44 +++++++++++++++++++++++--------------------- include/linux/devfreq.h | 26 +++++++++++++++++--------- 2 files changed, 40 insertions(+), 30 deletions(-) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index af5bd521a734..0828988ce263 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -224,8 +224,8 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) goto out; } - devfreq->time_in_state[prev_lev] += - cur_time - devfreq->last_stat_updated; + devfreq->stats.time_in_state[prev_lev] += + cur_time - devfreq->stats.last_update; lev = devfreq_get_freq_level(devfreq, freq); if (lev < 0) { @@ -234,13 +234,13 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) } if (lev != prev_lev) { - devfreq->trans_table[(prev_lev * - devfreq->profile->max_state) + lev]++; - devfreq->total_trans++; + devfreq->stats.trans_table[ + (prev_lev * devfreq->profile->max_state) + lev]++; + devfreq->stats.total_trans++; } out: - devfreq->last_stat_updated = cur_time; + devfreq->stats.last_update = cur_time; return ret; } EXPORT_SYMBOL(devfreq_update_status); @@ -535,7 +535,7 @@ void devfreq_monitor_resume(struct devfreq *devfreq) msecs_to_jiffies(devfreq->profile->polling_ms)); out_update: - devfreq->last_stat_updated = get_jiffies_64(); + devfreq->stats.last_update = get_jiffies_64(); devfreq->stop_polling = false; if (devfreq->profile->get_cur_freq && @@ -807,28 +807,29 @@ struct devfreq *devfreq_add_device(struct device *dev, goto err_out; } - devfreq->trans_table = devm_kzalloc(&devfreq->dev, + devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), devfreq->profile->max_state, devfreq->profile->max_state), GFP_KERNEL); - if (!devfreq->trans_table) { + if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); err = -ENOMEM; goto err_devfreq; } - devfreq->time_in_state = devm_kcalloc(&devfreq->dev, + devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, devfreq->profile->max_state, - sizeof(*devfreq->time_in_state), + sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); - if (!devfreq->time_in_state) { + if (!devfreq->stats.time_in_state) { mutex_unlock(&devfreq->lock); err = -ENOMEM; goto err_devfreq; } - devfreq->last_stat_updated = get_jiffies_64(); + devfreq->stats.total_trans = 0; + devfreq->stats.last_update = get_jiffies_64(); srcu_init_notifier_head(&devfreq->transition_notifier_list); @@ -1588,13 +1589,14 @@ static ssize_t trans_stat_show(struct device *dev, devfreq->profile->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", - devfreq->trans_table[(i * max_state) + j]); + devfreq->stats.trans_table[(i * max_state) + j]); + len += sprintf(buf + len, "%10llu\n", (u64) - jiffies64_to_msecs(devfreq->time_in_state[i])); + jiffies64_to_msecs(devfreq->stats.time_in_state[i])); } len += sprintf(buf + len, "Total transition : %u\n", - devfreq->total_trans); + devfreq->stats.total_trans); return len; } @@ -1613,13 +1615,13 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->time_in_state, 0, (df->profile->max_state * - sizeof(*df->time_in_state))); - memset(df->trans_table, 0, array3_size(sizeof(unsigned int), + memset(df->stats.time_in_state, 0, (df->profile->max_state * + sizeof(*df->stats.time_in_state))); + memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), df->profile->max_state, df->profile->max_state)); - df->total_trans = 0; - df->last_stat_updated = get_jiffies_64(); + df->stats.total_trans = 0; + df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); return count; diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 95816a8e3d26..9e73c84adf50 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -107,6 +107,20 @@ struct devfreq_dev_profile { unsigned int max_state; }; +/** + * struct devfreq_stats - Statistics of devfreq device behavior + * @total_trans: Number of devfreq transitions. + * @trans_table: Statistics of devfreq transitions. + * @time_in_state: Statistics of devfreq states. + * @last_update: The last time stats were updated. + */ +struct devfreq_stats { + unsigned int total_trans; + unsigned int *trans_table; + u64 *time_in_state; + u64 last_update; +}; + /** * struct devfreq - Device devfreq structure * @node: list node - contains the devices with devfreq that have been @@ -132,10 +146,7 @@ struct devfreq_dev_profile { * @suspend_freq: frequency of a device set during suspend phase. * @resume_freq: frequency of a device set in resume phase. * @suspend_count: suspend requests counter for a device. - * @total_trans: Number of devfreq transitions - * @trans_table: Statistics of devfreq transitions - * @time_in_state: Statistics of devfreq states - * @last_stat_updated: The last time stat updated + * @stats: Statistics of devfreq device behavior * @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier * @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY * @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY @@ -174,11 +185,8 @@ struct devfreq { unsigned long resume_freq; atomic_t suspend_count; - /* information for device frequency transition */ - unsigned int total_trans; - unsigned int *trans_table; - u64 *time_in_state; - u64 last_stat_updated; + /* information for device frequency transitions */ + struct devfreq_stats stats; struct srcu_notifier_head transition_notifier_list; -- cgit From f9002b169a6ec84612ddec18e460fe82ef811c18 Mon Sep 17 00:00:00 2001 From: Kamil Konieczny Date: Fri, 6 Dec 2019 11:11:29 +0100 Subject: PM / devfreq: Move declaration of DEVICE_ATTR_RW(min_freq) Declaration of DEVICE_ATTR_RW(min_freq) is placed after function max_freq_store. Move it to the correct place after min_freq_show. Signed-off-by: Kamil Konieczny Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 0828988ce263..8ef66e4598f3 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1470,6 +1470,7 @@ static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, return sprintf(buf, "%lu\n", min_freq); } +static DEVICE_ATTR_RW(min_freq); static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -1510,7 +1511,6 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, return count; } -static DEVICE_ATTR_RW(min_freq); static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, char *buf) -- cgit From 54cb5740526a2f30d57f146d8a17364c59287187 Mon Sep 17 00:00:00 2001 From: Randy Dunlap Date: Sat, 14 Dec 2019 08:03:11 -0800 Subject: PM / devfreq: Fix multiple kernel-doc warnings Fix kernel-doc warnings in devfreq files. Also fix a typo. Signed-off-by: Randy Dunlap Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq-event.c | 4 ++-- drivers/devfreq/devfreq.c | 4 ++-- include/linux/devfreq.h | 3 ++- 3 files changed, 6 insertions(+), 5 deletions(-) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c index 3dc5fd6065a3..8c31b0f2e28f 100644 --- a/drivers/devfreq/devfreq-event.c +++ b/drivers/devfreq/devfreq-event.c @@ -346,9 +346,9 @@ EXPORT_SYMBOL_GPL(devfreq_event_add_edev); /** * devfreq_event_remove_edev() - Remove the devfreq-event device registered. - * @dev : the devfreq-event device + * @edev : the devfreq-event device * - * Note that this function remove the registered devfreq-event device. + * Note that this function removes the registered devfreq-event device. */ int devfreq_event_remove_edev(struct devfreq_event_dev *edev) { diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 8ef66e4598f3..89260b17598f 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1852,7 +1852,7 @@ static void devm_devfreq_notifier_release(struct device *dev, void *res) /** * devm_devfreq_register_notifier() - - Resource-managed devfreq_register_notifier() + * - Resource-managed devfreq_register_notifier() * @dev: The devfreq user device. (parent of devfreq) * @devfreq: The devfreq object. * @nb: The notifier block to be unregistered. @@ -1888,7 +1888,7 @@ EXPORT_SYMBOL(devm_devfreq_register_notifier); /** * devm_devfreq_unregister_notifier() - - Resource-managed devfreq_unregister_notifier() + * - Resource-managed devfreq_unregister_notifier() * @dev: The devfreq user device. (parent of devfreq) * @devfreq: The devfreq object. * @nb: The notifier block to be unregistered. diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 9e73c84adf50..c6f82d4bec9f 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -136,6 +136,7 @@ struct devfreq_stats { * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. * @previous_freq: previously configured frequency value. + * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not * touch this. * @user_min_freq_req: PM QoS minimum frequency request from user (via sysfs) @@ -151,7 +152,7 @@ struct devfreq_stats { * @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY * @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY * - * This structure stores the devfreq information for a give device. + * This structure stores the devfreq information for a given device. * * Note that when a governor accesses entries in struct devfreq in its * functions except for the context of callbacks defined in struct -- cgit From 490a421bc575d1bf391a6ad5b582dcfbd0037724 Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Thu, 26 Dec 2019 14:23:49 +0900 Subject: 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 Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) (limited to 'drivers/devfreq/devfreq.c') diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 89260b17598f..cceee8bc3c2f 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -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); -- cgit