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path: root/drivers/cpufreq/powernv-cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/powernv-cpufreq.c')
-rw-r--r--drivers/cpufreq/powernv-cpufreq.c124
1 files changed, 89 insertions, 35 deletions
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 50bf12033bbc..39ac78c94be0 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -44,7 +44,6 @@
static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
static bool rebooting, throttled, occ_reset;
-static unsigned int *core_to_chip_map;
static const char * const throttle_reason[] = {
"No throttling",
@@ -55,6 +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;
@@ -62,9 +71,13 @@ 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;
+static DEFINE_PER_CPU(struct chip *, chip_info);
/*
* Note: The set of pstates consists of contiguous integers, the
@@ -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 */
@@ -324,34 +373,35 @@ static inline unsigned int get_nominal_index(void)
static void powernv_cpufreq_throttle_check(void *data)
{
+ struct chip *chip;
unsigned int cpu = smp_processor_id();
- unsigned int chip_id = core_to_chip_map[cpu_core_index_of_thread(cpu)];
unsigned long pmsr;
- int pmsr_pmax, i;
+ int pmsr_pmax;
pmsr = get_pmspr(SPRN_PMSR);
-
- for (i = 0; i < nr_chips; i++)
- if (chips[i].id == chip_id)
- break;
+ chip = this_cpu_read(chip_info);
/* Check for Pmax Capping */
pmsr_pmax = (s8)PMSR_MAX(pmsr);
if (pmsr_pmax != powernv_pstate_info.max) {
- if (chips[i].throttled)
+ if (chip->throttled)
goto next;
- chips[i].throttled = true;
- if (pmsr_pmax < powernv_pstate_info.nominal)
+ chip->throttled = true;
+ 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, chips[i].id, pmsr_pmax,
+ cpu, chip->id, pmsr_pmax,
powernv_pstate_info.nominal);
- trace_powernv_throttle(chips[i].id,
- throttle_reason[chips[i].throttle_reason],
+ chip->throttle_sub_turbo++;
+ } else {
+ chip->throttle_turbo++;
+ }
+ trace_powernv_throttle(chip->id,
+ throttle_reason[chip->throttle_reason],
pmsr_pmax);
- } else if (chips[i].throttled) {
- chips[i].throttled = false;
- trace_powernv_throttle(chips[i].id,
- throttle_reason[chips[i].throttle_reason],
+ } else if (chip->throttled) {
+ chip->throttled = false;
+ trace_powernv_throttle(chip->id,
+ throttle_reason[chip->throttle_reason],
pmsr_pmax);
}
@@ -411,6 +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);
}
@@ -517,8 +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;
@@ -558,47 +625,34 @@ static int init_chip_info(void)
unsigned int chip[256];
unsigned int cpu, i;
unsigned int prev_chip_id = UINT_MAX;
- cpumask_t cpu_mask;
- int ret = -ENOMEM;
-
- core_to_chip_map = kcalloc(cpu_nr_cores(), sizeof(unsigned int),
- GFP_KERNEL);
- if (!core_to_chip_map)
- goto out;
- cpumask_copy(&cpu_mask, cpu_possible_mask);
- for_each_cpu(cpu, &cpu_mask) {
+ for_each_possible_cpu(cpu) {
unsigned int id = cpu_to_chip_id(cpu);
if (prev_chip_id != id) {
prev_chip_id = id;
chip[nr_chips++] = id;
}
- core_to_chip_map[cpu_core_index_of_thread(cpu)] = id;
- cpumask_andnot(&cpu_mask, &cpu_mask, cpu_sibling_mask(cpu));
}
chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL);
if (!chips)
- goto free_chip_map;
+ return -ENOMEM;
for (i = 0; i < nr_chips; i++) {
chips[i].id = chip[i];
cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
+ for_each_cpu(cpu, &chips[i].mask)
+ per_cpu(chip_info, cpu) = &chips[i];
}
return 0;
-free_chip_map:
- kfree(core_to_chip_map);
-out:
- return ret;
}
static inline void clean_chip_info(void)
{
kfree(chips);
- kfree(core_to_chip_map);
}
static inline void unregister_all_notifiers(void)
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