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Date: Sun, 13 Dec 2015 23:47:37 +0530
From: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To: linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Cc: rjw@...ysocki.net, viresh.kumar@...aro.org,
Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH] cpufreq: powernv: Redesign the presentation of throttle notification
Replace the throttling event console messages to perf trace event
"power:powernv_throttle" and throttle counter stats which are
exported in sysfs. The newly added sysfs files are as follows:
1)/sys/devices/system/node/node0/throttle_frequencies
This gives the throttle stats for each of the available frequencies.
The throttle stat of a frequency is the total number of times the max
frequency was reduced to that frequency.
# cat /sys/devices/system/node/node0/throttle_frequencies
4023000 0
3990000 0
3956000 1
3923000 0
3890000 0
3857000 2
3823000 0
3790000 0
3757000 2
3724000 1
3690000 1
...
2)/sys/devices/system/node/node0/throttle_reasons
This gives the stats for each of the supported throttle reasons.
This gives the total number of times the frequency was throttled due
to each of the reasons.
# cat /sys/devices/system/node/node0/throttle_reasons
No throttling 7
Power Cap 0
Processor Over Temperature 7
Power Supply Failure 0
Over Current 0
OCC Reset 0
3)/sys/devices/system/node/node0/throttle_stat
This gives the total number of throttle events occurred in turbo
range of frequencies and non-turbo(below nominal) range of
frequencies.
# cat /sys/devices/system/node/node0/throttle_stat
Turbo 7
Nominal 0
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
---
drivers/cpufreq/powernv-cpufreq.c | 186 +++++++++++++++++++++++++++++---------
include/trace/events/power.h | 22 +++++
2 files changed, 166 insertions(+), 42 deletions(-)
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index cb50138..bdde9d6 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -28,6 +28,9 @@
#include <linux/of.h>
#include <linux/reboot.h>
#include <linux/slab.h>
+#include <trace/events/power.h>
+#include <linux/device.h>
+#include <linux/node.h>
#include <asm/cputhreads.h>
#include <asm/firmware.h>
@@ -43,12 +46,27 @@
static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
static bool rebooting, throttled, occ_reset;
+static char throttle_reason[][30] = {
+ "No throttling",
+ "Power Cap",
+ "Processor Over Temperature",
+ "Power Supply Failure",
+ "Over Current",
+ "OCC Reset"
+ };
+
static struct chip {
unsigned int id;
bool throttled;
cpumask_t mask;
struct work_struct throttle;
bool restore;
+ /* Pmax throttle stats */
+ int throt_reason;
+ int throt_turbo;
+ int throt_nominal;
+ int reason[OCC_MAX_THROTTLE_STATUS + 1];
+ int *pstate_stat;
} *chips;
static int nr_chips;
@@ -309,40 +327,54 @@ static inline unsigned int get_nominal_index(void)
return powernv_pstate_info.max - powernv_pstate_info.nominal;
}
-static void powernv_cpufreq_throttle_check(void *data)
+static void powernv_cpufreq_read_pmax(void *data)
{
unsigned int cpu = smp_processor_id();
unsigned long pmsr;
- int pmsr_pmax, i;
-
- pmsr = get_pmspr(SPRN_PMSR);
+ int pmsr_pmax, index, i;
for (i = 0; i < nr_chips; i++)
if (chips[i].id == cpu_to_chip_id(cpu))
break;
- /* Check for Pmax Capping */
+ pmsr = get_pmspr(SPRN_PMSR);
pmsr_pmax = (s8)PMSR_MAX(pmsr);
if (pmsr_pmax != powernv_pstate_info.max) {
if (chips[i].throttled)
- goto next;
+ return;
chips[i].throttled = true;
- if (pmsr_pmax < powernv_pstate_info.nominal)
- pr_crit("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n",
+ if (pmsr_pmax < powernv_pstate_info.nominal) {
+ pr_warn("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n",
cpu, chips[i].id, pmsr_pmax,
powernv_pstate_info.nominal);
- else
- pr_info("CPU %d on Chip %u has Pmax reduced below turbo frequency (%d < %d)\n",
- cpu, chips[i].id, pmsr_pmax,
- powernv_pstate_info.max);
+ chips[i].throt_nominal++;
+ } else {
+ chips[i].throt_turbo++;
+ }
+ index = powernv_pstate_info.max - pmsr_pmax;
+ if (index >= 0 && index < powernv_pstate_info.nr_pstates)
+ chips[i].pstate_stat[index]++;
+ trace_powernv_throttle(chips[i].id,
+ throttle_reason[chips[i].throt_reason],
+ pmsr_pmax);
} else if (chips[i].throttled) {
chips[i].throttled = false;
- pr_info("CPU %d on Chip %u has Pmax restored to %d\n", cpu,
- chips[i].id, pmsr_pmax);
+ trace_powernv_throttle(chips[i].id,
+ throttle_reason[chips[i].throt_reason],
+ pmsr_pmax);
}
+}
+
+static void powernv_cpufreq_throttle_check(void *data)
+{
+ unsigned long pmsr;
+
+ pmsr = get_pmspr(SPRN_PMSR);
+
+ /* Check for Pmax Capping */
+ powernv_cpufreq_read_pmax(NULL);
/* Check if Psafe_mode_active is set in PMSR. */
-next:
if (pmsr & PMSR_PSAFE_ENABLE) {
throttled = true;
pr_info("Pstate set to safe frequency\n");
@@ -356,7 +388,7 @@ next:
if (throttled) {
pr_info("PMSR = %16lx\n", pmsr);
- pr_crit("CPU Frequency could be throttled\n");
+ pr_warn("CPU Frequency could be throttled\n");
}
}
@@ -447,15 +479,6 @@ void powernv_cpufreq_work_fn(struct work_struct *work)
}
}
-static char throttle_reason[][30] = {
- "No throttling",
- "Power Cap",
- "Processor Over Temperature",
- "Power Supply Failure",
- "Over Current",
- "OCC Reset"
- };
-
static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
unsigned long msg_type, void *_msg)
{
@@ -481,7 +504,7 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
*/
if (!throttled) {
throttled = true;
- pr_crit("CPU frequency is throttled for duration\n");
+ pr_warn("CPU frequency is throttled for duration\n");
}
break;
@@ -505,23 +528,19 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
return 0;
}
- if (omsg.throttle_status &&
- omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS)
- pr_info("OCC: Chip %u Pmax reduced due to %s\n",
- (unsigned int)omsg.chip,
- throttle_reason[omsg.throttle_status]);
- else if (!omsg.throttle_status)
- pr_info("OCC: Chip %u %s\n", (unsigned int)omsg.chip,
- throttle_reason[omsg.throttle_status]);
- else
- return 0;
-
for (i = 0; i < nr_chips; i++)
- if (chips[i].id == omsg.chip) {
- if (!omsg.throttle_status)
- chips[i].restore = true;
- schedule_work(&chips[i].throttle);
- }
+ if (chips[i].id == omsg.chip)
+ break;
+ if (omsg.throttle_status >= 0 &&
+ omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) {
+ chips[i].reason[omsg.throttle_status]++;
+ chips[i].throt_reason = omsg.throttle_status;
+ }
+
+ if (!omsg.throttle_status)
+ chips[i].restore = true;
+
+ schedule_work(&chips[i].throttle);
}
return 0;
}
@@ -532,6 +551,61 @@ static struct notifier_block powernv_cpufreq_opal_nb = {
.priority = 0,
};
+static ssize_t throttle_freq_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, count = 0, id;
+
+ for (i = 0; i < nr_chips; i++)
+ if (chips[i].id == dev->id)
+ break;
+ id = i;
+ for (i = 0; i < powernv_pstate_info.nr_pstates; i++)
+ count += sprintf(&buf[count], "%d %d\n",
+ powernv_freqs[i].frequency,
+ chips[id].pstate_stat[i]);
+ count += sprintf(&buf[count], "\n");
+
+ return count;
+}
+
+static DEVICE_ATTR(throttle_frequencies, 0400, throttle_freq_show, NULL);
+
+static ssize_t throttle_reasons_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, count = 0, id;
+
+ for (i = 0; i < nr_chips; i++)
+ if (chips[i].id == dev->id)
+ break;
+ id = i;
+ for (i = 0; i <= OCC_MAX_THROTTLE_STATUS; i++)
+ count += sprintf(&buf[count], "%s %d\n", throttle_reason[i],
+ chips[id].reason[i]);
+
+ return count;
+}
+
+static DEVICE_ATTR(throttle_reasons, 0400, throttle_reasons_show, NULL);
+
+static ssize_t throttle_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, count = 0;
+
+ for (i = 0; i < nr_chips; i++)
+ if (chips[i].id == dev->id)
+ break;
+
+ count += sprintf(&buf[count], "Turbo %d\n", chips[i].throt_turbo);
+ count += sprintf(&buf[count], "Nominal %d\n", chips[i].throt_nominal);
+
+ return count;
+}
+
+static DEVICE_ATTR(throttle_stat, 0400, throttle_stat_show, NULL);
+
static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy)
{
struct powernv_smp_call_data freq_data;
@@ -571,11 +645,29 @@ static int init_chip_info(void)
return -ENOMEM;
for (i = 0; i < nr_chips; i++) {
+ unsigned int j;
+
chips[i].id = chip[i];
chips[i].throttled = false;
cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
chips[i].restore = false;
+ chips[i].throt_nominal = 0;
+ chips[i].throt_turbo = 0;
+ chips[i].pstate_stat = kcalloc(powernv_pstate_info.nr_pstates,
+ sizeof(int), GFP_KERNEL);
+ if (!chips[i].pstate_stat)
+ return -ENOMEM;
+
+ for (j = 0; j <= OCC_MAX_THROTTLE_STATUS; j++)
+ chips[i].reason[j] = 0;
+
+ device_create_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_reasons);
+ device_create_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_frequencies);
+ device_create_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_stat);
}
return 0;
@@ -609,9 +701,19 @@ module_init(powernv_cpufreq_init);
static void __exit powernv_cpufreq_exit(void)
{
+ int i;
+
unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);
opal_message_notifier_unregister(OPAL_MSG_OCC,
&powernv_cpufreq_opal_nb);
+ for (i = 0; i < nr_chips; i++) {
+ device_remove_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_reasons);
+ device_remove_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_frequencies);
+ device_remove_file(&node_devices[chips[i].id]->dev,
+ &dev_attr_throttle_stat);
+ }
cpufreq_unregister_driver(&powernv_cpufreq_driver);
}
module_exit(powernv_cpufreq_exit);
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 284244e..8a77228 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -38,6 +38,28 @@ DEFINE_EVENT(cpu, cpu_idle,
TP_ARGS(state, cpu_id)
);
+TRACE_EVENT(powernv_throttle,
+
+ TP_PROTO(int chip_id, char *reason, int pmax),
+
+ TP_ARGS(chip_id, reason, pmax),
+
+ TP_STRUCT__entry(
+ __field(int, chip_id)
+ __string(reason, reason)
+ __field(int, pmax)
+ ),
+
+ TP_fast_assign(
+ __entry->chip_id = chip_id;
+ __assign_str(reason, reason);
+ __entry->pmax = pmax;
+ ),
+
+ TP_printk("Chip %d Pmax %d %s", __entry->chip_id,
+ __entry->pmax, __get_str(reason))
+);
+
TRACE_EVENT(pstate_sample,
TP_PROTO(u32 core_busy,
--
1.9.3
--
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