cpufreq: powernv: Add sysfs attributes to show throttle stats
Create sysfs attributes to export throttle information in /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats directory. The newly added sysfs files are as follows: 1)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/turbo_stat 2)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/sub-turbo_stat 3)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/unthrottle 4)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/powercap 5)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/overtemp 6)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/supply_fault 7)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/overcurrent 8)/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/occ_reset Detailed explanation of each attribute is added to Documentation/ABI/testing/sysfs-devices-system-cpu Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Shilpasri G Bhat
Rafael J. Wysocki
parent
ac13b9967d
commit
1b0289848d
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@ -271,3 +271,72 @@ Description: Parameters for the CPU cache attributes
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- WriteBack: data is written only to the cache line and
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the modified cache line is written to main
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memory only when it is replaced
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What: /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/turbo_stat
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/sub_turbo_stat
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/unthrottle
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/powercap
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/overtemp
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/supply_fault
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/overcurrent
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/sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/occ_reset
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Date: March 2016
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
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Description: POWERNV CPUFreq driver's frequency throttle stats directory and
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attributes
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'cpuX/cpufreq/throttle_stats' directory contains the CPU frequency
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throttle stat attributes for the chip. The throttle stats of a cpu
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is common across all the cpus belonging to a chip. Below are the
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throttle attributes exported in the 'throttle_stats' directory:
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- turbo_stat : This file gives the total number of times the max
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frequency is throttled to lower frequency in turbo (at and above
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nominal frequency) range of frequencies.
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- sub_turbo_stat : This file gives the total number of times the
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max frequency is throttled to lower frequency in sub-turbo(below
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nominal frequency) range of frequencies.
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- unthrottle : This file gives the total number of times the max
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frequency is unthrottled after being throttled.
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- powercap : This file gives the total number of times the max
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frequency is throttled due to 'Power Capping'.
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- overtemp : This file gives the total number of times the max
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frequency is throttled due to 'CPU Over Temperature'.
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- supply_fault : This file gives the total number of times the
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max frequency is throttled due to 'Power Supply Failure'.
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- overcurrent : This file gives the total number of times the
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max frequency is throttled due to 'Overcurrent'.
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- occ_reset : This file gives the total number of times the max
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frequency is throttled due to 'OCC Reset'.
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The sysfs attributes representing different throttle reasons like
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powercap, overtemp, supply_fault, overcurrent and occ_reset map to
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the reasons provided by OCC firmware for throttling the frequency.
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What: /sys/devices/system/cpu/cpufreq/policyX/throttle_stats
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/turbo_stat
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/sub_turbo_stat
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/unthrottle
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/powercap
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/overtemp
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/supply_fault
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/overcurrent
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/sys/devices/system/cpu/cpufreq/policyX/throttle_stats/occ_reset
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Date: March 2016
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
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Description: POWERNV CPUFreq driver's frequency throttle stats directory and
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attributes
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'policyX/throttle_stats' directory and all the attributes are same as
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the /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats directory and
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attributes which give the frequency throttle information of the chip.
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@ -54,6 +54,16 @@ static const char * const throttle_reason[] = {
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"OCC Reset"
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};
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enum throttle_reason_type {
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NO_THROTTLE = 0,
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POWERCAP,
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CPU_OVERTEMP,
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POWER_SUPPLY_FAILURE,
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OVERCURRENT,
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OCC_RESET_THROTTLE,
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OCC_MAX_REASON
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};
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static struct chip {
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unsigned int id;
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bool throttled;
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@ -61,6 +71,9 @@ static struct chip {
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u8 throttle_reason;
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cpumask_t mask;
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struct work_struct throttle;
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int throttle_turbo;
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int throttle_sub_turbo;
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int reason[OCC_MAX_REASON];
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} *chips;
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static int nr_chips;
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@ -196,6 +209,42 @@ static struct freq_attr *powernv_cpu_freq_attr[] = {
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NULL,
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};
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#define throttle_attr(name, member) \
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static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \
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{ \
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struct chip *chip = per_cpu(chip_info, policy->cpu); \
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\
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return sprintf(buf, "%u\n", chip->member); \
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} \
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\
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static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \
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throttle_attr(unthrottle, reason[NO_THROTTLE]);
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throttle_attr(powercap, reason[POWERCAP]);
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throttle_attr(overtemp, reason[CPU_OVERTEMP]);
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throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]);
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throttle_attr(overcurrent, reason[OVERCURRENT]);
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throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]);
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throttle_attr(turbo_stat, throttle_turbo);
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throttle_attr(sub_turbo_stat, throttle_sub_turbo);
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static struct attribute *throttle_attrs[] = {
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&throttle_attr_unthrottle.attr,
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&throttle_attr_powercap.attr,
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&throttle_attr_overtemp.attr,
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&throttle_attr_supply_fault.attr,
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&throttle_attr_overcurrent.attr,
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&throttle_attr_occ_reset.attr,
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&throttle_attr_turbo_stat.attr,
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&throttle_attr_sub_turbo_stat.attr,
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NULL,
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};
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static const struct attribute_group throttle_attr_grp = {
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.name = "throttle_stats",
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.attrs = throttle_attrs,
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};
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/* Helper routines */
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/* Access helpers to power mgt SPR */
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@ -338,10 +387,14 @@ static void powernv_cpufreq_throttle_check(void *data)
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if (chip->throttled)
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goto next;
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chip->throttled = true;
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if (pmsr_pmax < powernv_pstate_info.nominal)
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if (pmsr_pmax < powernv_pstate_info.nominal) {
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pr_warn_once("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n",
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cpu, chip->id, pmsr_pmax,
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powernv_pstate_info.nominal);
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chip->throttle_sub_turbo++;
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} else {
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chip->throttle_turbo++;
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}
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trace_powernv_throttle(chip->id,
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throttle_reason[chip->throttle_reason],
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pmsr_pmax);
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@ -408,6 +461,21 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
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for (i = 0; i < threads_per_core; i++)
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cpumask_set_cpu(base + i, policy->cpus);
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if (!policy->driver_data) {
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int ret;
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ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
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if (ret) {
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pr_info("Failed to create throttle stats directory for cpu %d\n",
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policy->cpu);
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return ret;
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}
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/*
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* policy->driver_data is used as a flag for one-time
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* creation of throttle sysfs files.
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*/
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policy->driver_data = policy;
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}
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return cpufreq_table_validate_and_show(policy, powernv_freqs);
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}
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@ -514,8 +582,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
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break;
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if (omsg.throttle_status >= 0 &&
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omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS)
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omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) {
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chips[i].throttle_reason = omsg.throttle_status;
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chips[i].reason[omsg.throttle_status]++;
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}
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if (!omsg.throttle_status)
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chips[i].restore = true;
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