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cpufreq: powernv: Call throttle_check() on receiving OCC_THROTTLE 

Re-evaluate the chip's throttled state on recieving OCC_THROTTLE
notification by executing *throttle_check() on any one of the cpu on
the chip. This is a sanity check to verify if we were indeed
throttled/unthrottled after receiving OCC_THROTTLE notification.

We cannot call *throttle_check() directly from the notification
handler because we could be handling chip1's notification in chip2. So
initiate an smp_call to execute *throttle_check(). We are irq-disabled
in the notification handler, so use a worker thread to smp_call
throttle_check() on any of the cpu in the chipmask.

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 2015-07-16 13:34:21 +05:30 committed by Rafael J. Wysocki
parent cb166fa937
commit 735366fc40
1 changed files with 26 additions and 2 deletions
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28
drivers/cpufreq/powernv-cpufreq.c
View File

@ -47,6 +47,8 @@ static bool rebooting, throttled, occ_reset;
static struct chip {
unsigned int id;
bool throttled;
cpumask_t mask;
struct work_struct throttle;
} *chips;
static int nr_chips;
@ -307,8 +309,9 @@ static inline unsigned int get_nominal_index(void)
return powernv_pstate_info.max - powernv_pstate_info.nominal;
}
static void powernv_cpufreq_throttle_check(unsigned int cpu)
static void powernv_cpufreq_throttle_check(void *data)
{
unsigned int cpu = smp_processor_id();
unsigned long pmsr;
int pmsr_pmax, pmsr_lp, i;
@ -370,7 +373,7 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
return 0;
if (!throttled)
powernv_cpufreq_throttle_check(smp_processor_id());
powernv_cpufreq_throttle_check(NULL);
freq_data.pstate_id = powernv_freqs[new_index].driver_data;
@ -415,6 +418,14 @@ static struct notifier_block powernv_cpufreq_reboot_nb = {
.notifier_call = powernv_cpufreq_reboot_notifier,
};
void powernv_cpufreq_work_fn(struct work_struct *work)
{
struct chip *chip = container_of(work, struct chip, throttle);
smp_call_function_any(&chip->mask,
powernv_cpufreq_throttle_check, NULL, 0);
}
static char throttle_reason[][30] = {
"No throttling",
"Power Cap",
@ -429,6 +440,7 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
{
struct opal_msg *msg = _msg;
struct opal_occ_msg omsg;
int i;
if (msg_type != OPAL_MSG_OCC)
return 0;
@ -462,6 +474,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
occ_reset = false;
throttled = false;
pr_info("OCC: Active\n");
for (i = 0; i < nr_chips; i++)
schedule_work(&chips[i].throttle);
return 0;
}
@ -473,6 +489,12 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
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)
schedule_work(&chips[i].throttle);
}
return 0;
}
@ -524,6 +546,8 @@ static int init_chip_info(void)
for (i = 0; i < nr_chips; i++) {
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);
}
return 0;