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cpufreq: powernv: Add sysfs attributes to show throttle stats

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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
2016-03-22 18:57:09 +05:30
committed by Rafael J. Wysocki
parent ac13b9967d
commit 1b0289848d
2 changed files with 141 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/cpufreq/powernv-cpufreq.c
View File

@@ -54,6 +54,16 @@ static const char * const throttle_reason[] = {
"OCC Reset"
};
enum throttle_reason_type {
NO_THROTTLE = 0,
POWERCAP,
CPU_OVERTEMP,
POWER_SUPPLY_FAILURE,
OVERCURRENT,
OCC_RESET_THROTTLE,
OCC_MAX_REASON
};
static struct chip {
unsigned int id;
bool throttled;
@@ -61,6 +71,9 @@ static struct chip {
u8 throttle_reason;
cpumask_t mask;
struct work_struct throttle;
int throttle_turbo;
int throttle_sub_turbo;
int reason[OCC_MAX_REASON];
} *chips;
static int nr_chips;
@@ -196,6 +209,42 @@ static struct freq_attr *powernv_cpu_freq_attr[] = {
NULL,
};
#define throttle_attr(name, member) \
static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \
{ \
struct chip *chip = per_cpu(chip_info, policy->cpu); \
\
return sprintf(buf, "%u\n", chip->member); \
} \
\
static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \
throttle_attr(unthrottle, reason[NO_THROTTLE]);
throttle_attr(powercap, reason[POWERCAP]);
throttle_attr(overtemp, reason[CPU_OVERTEMP]);
throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]);
throttle_attr(overcurrent, reason[OVERCURRENT]);
throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]);
throttle_attr(turbo_stat, throttle_turbo);
throttle_attr(sub_turbo_stat, throttle_sub_turbo);
static struct attribute *throttle_attrs[] = {
&throttle_attr_unthrottle.attr,
&throttle_attr_powercap.attr,
&throttle_attr_overtemp.attr,
&throttle_attr_supply_fault.attr,
&throttle_attr_overcurrent.attr,
&throttle_attr_occ_reset.attr,
&throttle_attr_turbo_stat.attr,
&throttle_attr_sub_turbo_stat.attr,
NULL,
};
static const struct attribute_group throttle_attr_grp = {
.name = "throttle_stats",
.attrs = throttle_attrs,
};
/* Helper routines */
/* Access helpers to power mgt SPR */
@@ -338,10 +387,14 @@ static void powernv_cpufreq_throttle_check(void *data)
if (chip->throttled)
goto next;
chip->throttled = true;
if (pmsr_pmax < powernv_pstate_info.nominal)
if (pmsr_pmax < powernv_pstate_info.nominal) {
pr_warn_once("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n",
cpu, chip->id, pmsr_pmax,
powernv_pstate_info.nominal);
chip->throttle_sub_turbo++;
} else {
chip->throttle_turbo++;
}
trace_powernv_throttle(chip->id,
throttle_reason[chip->throttle_reason],
pmsr_pmax);
@@ -408,6 +461,21 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
for (i = 0; i < threads_per_core; i++)
cpumask_set_cpu(base + i, policy->cpus);
if (!policy->driver_data) {
int ret;
ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
if (ret) {
pr_info("Failed to create throttle stats directory for cpu %d\n",
policy->cpu);
return ret;
}
/*
* policy->driver_data is used as a flag for one-time
* creation of throttle sysfs files.
*/
policy->driver_data = policy;
}
return cpufreq_table_validate_and_show(policy, powernv_freqs);
}
@@ -514,8 +582,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
break;
if (omsg.throttle_status >= 0 &&
omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS)
omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) {
chips[i].throttle_reason = omsg.throttle_status;
chips[i].reason[omsg.throttle_status]++;
}
if (!omsg.throttle_status)
chips[i].restore = true;