linux-kernel - [PATCH v3 6/6] cpufreq: powernv: Restore cpu frequency to policy->cur on unthrottling

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Date:	Mon,  4 May 2015 14:24:12 +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,
	preeti@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH v3 6/6] cpufreq: powernv: Restore cpu frequency to policy->cur on unthrottling

If frequency is throttled due to OCC reset then cpus will be in Psafe
frequency, so restore the frequency on all cpus to policy->cur when
OCCs are active again. And if frequency is throttled due to Pmax
capping then restore the frequency of all the cpus  in the chip on
unthrottling.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
---
 drivers/cpufreq/powernv-cpufreq.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 0a59d5b..b2915bc 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -51,6 +51,7 @@ static struct chip {
 	bool throttled;
 	cpumask_t mask;
 	struct work_struct throttle;
+	bool restore;
 } *chips;
 
 static int nr_chips;
@@ -418,9 +419,29 @@ static struct notifier_block powernv_cpufreq_reboot_nb = {
 void powernv_cpufreq_work_fn(struct work_struct *work)
 {
 	struct chip *chip = container_of(work, struct chip, throttle);
+	unsigned int cpu;
+	cpumask_var_t mask;
 
 	smp_call_function_any(&chip->mask,
 			      powernv_cpufreq_throttle_check, NULL, 0);
+
+	if (!chip->restore)
+		return;
+
+	chip->restore = false;
+	cpumask_copy(mask, &chip->mask);
+	for_each_cpu_and(cpu, mask, cpu_online_mask) {
+		int index, tcpu;
+		struct cpufreq_policy policy;
+
+		cpufreq_get_policy(&policy, cpu);
+		cpufreq_frequency_table_target(&policy, policy.freq_table,
+					       policy.cur,
+					       CPUFREQ_RELATION_C, &index);
+		powernv_cpufreq_target_index(&policy, index);
+		for_each_cpu(tcpu, policy.cpus)
+			cpumask_clear_cpu(tcpu, mask);
+	}
 }
 
 static char throttle_reason[][30] = {
@@ -473,8 +494,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
 			throttled = false;
 			pr_info("OCC: Active\n");
 
-			for (i = 0; i < nr_chips; i++)
+			for (i = 0; i < nr_chips; i++) {
+				chips[i].restore = true;
 				schedule_work(&chips[i].throttle);
+			}
 
 			return 0;
 		}
@@ -490,8 +513,11 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
 			return 0;
 
 		for (i = 0; i < nr_chips; i++)
-			if (chips[i].id == chip_id)
+			if (chips[i].id == chip_id) {
+				if (!reason)
+					chips[i].restore = true;
 				schedule_work(&chips[i].throttle);
+			}
 	}
 	return 0;
 }
@@ -545,6 +571,7 @@ static int init_chip_info(void)
 		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;
 	}
 
 	return 0;
-- 
1.9.3

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