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Subject[PATCH 2/2] cpufreq: arm_big_little: use generic OPP functions for {init,free}_opp_table
Date
Currently when performing random hotplugs and suspend-to-ram(S2R) on
systems using arm_big_little cpufreq driver, we get warnings similar to:

cpu cpu1: _opp_add: duplicate OPPs detected. Existing: freq: 600000000,
volt: 800000, enabled: 1. New: freq: 600000000, volt: 800000, enabled: 1

This is mainly because the OPPs for the shared cpus are not set. We can
just use dev_pm_opp_of_cpumask_add_table in case the OPPs are obtained
from DT(arm_big_little_dt.c) or use dev_pm_opp_set_sharing_cpus if the
OPPs are obtained by other means like firmware(e.g. scpi-cpufreq.c)

Also now that the generic dev_pm_opp_cpumask_remove_table can handle
removal of opp table and entries for all associated CPUs, we can reuse
dev_pm_opp_cpumask_remove_table as free_opp_table in cpufreq_arm_bL_ops.

This patch makes necessary changes to reuse the generic OPP functions for
{init,free}_opp_table and thereby eliminating the warnings.

Cc: Viresh Kumar <vireshk@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-pm@vger.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/cpufreq/arm_big_little.c | 54 ++++++++++++++++++++-----------------
drivers/cpufreq/arm_big_little.h | 4 +--
drivers/cpufreq/arm_big_little_dt.c | 21 ++-------------
drivers/cpufreq/scpi-cpufreq.c | 24 ++++++++++++++---
4 files changed, 54 insertions(+), 49 deletions(-)

Hi Viresh,

Why is dynamic OPPs not deleted in dev_pm_opp_{,cpumask_}remove_table ?
It would remove some code in scpi-cpufreq.c but I would like to understand.
Is there any use in not deleting them there ?

Regards,
Sudeep

diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index c251247ae661..6f3a951da31f 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c
@@ -298,7 +298,8 @@ static int merge_cluster_tables(void)
return 0;
}

-static void _put_cluster_clk_and_freq_table(struct device *cpu_dev)
+static void _put_cluster_clk_and_freq_table(struct device *cpu_dev,
+ cpumask_var_t cpumask)
{
u32 cluster = raw_cpu_to_cluster(cpu_dev->id);

@@ -308,11 +309,12 @@ static void _put_cluster_clk_and_freq_table(struct device *cpu_dev)
clk_put(clk[cluster]);
dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
if (arm_bL_ops->free_opp_table)
- arm_bL_ops->free_opp_table(cpu_dev);
+ arm_bL_ops->free_opp_table(cpumask);
dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster);
}

-static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
+static void put_cluster_clk_and_freq_table(struct device *cpu_dev,
+ cpumask_var_t cpumask)
{
u32 cluster = cpu_to_cluster(cpu_dev->id);
int i;
@@ -321,7 +323,7 @@ static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
return;

if (cluster < MAX_CLUSTERS)
- return _put_cluster_clk_and_freq_table(cpu_dev);
+ return _put_cluster_clk_and_freq_table(cpu_dev, cpumask);

for_each_present_cpu(i) {
struct device *cdev = get_cpu_device(i);
@@ -330,14 +332,15 @@ static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
return;
}

- _put_cluster_clk_and_freq_table(cdev);
+ _put_cluster_clk_and_freq_table(cdev, cpumask);
}

/* free virtual table */
kfree(freq_table[cluster]);
}

-static int _get_cluster_clk_and_freq_table(struct device *cpu_dev)
+static int _get_cluster_clk_and_freq_table(struct device *cpu_dev,
+ cpumask_var_t cpumask)
{
u32 cluster = raw_cpu_to_cluster(cpu_dev->id);
int ret;
@@ -345,7 +348,7 @@ static int _get_cluster_clk_and_freq_table(struct device *cpu_dev)
if (freq_table[cluster])
return 0;

- ret = arm_bL_ops->init_opp_table(cpu_dev);
+ ret = arm_bL_ops->init_opp_table(cpumask);
if (ret) {
dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n",
__func__, cpu_dev->id, ret);
@@ -374,14 +377,15 @@ static int _get_cluster_clk_and_freq_table(struct device *cpu_dev)

free_opp_table:
if (arm_bL_ops->free_opp_table)
- arm_bL_ops->free_opp_table(cpu_dev);
+ arm_bL_ops->free_opp_table(cpumask);
out:
dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__,
cluster);
return ret;
}

-static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
+static int get_cluster_clk_and_freq_table(struct device *cpu_dev,
+ cpumask_var_t cpumask)
{
u32 cluster = cpu_to_cluster(cpu_dev->id);
int i, ret;
@@ -390,7 +394,7 @@ static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
return 0;

if (cluster < MAX_CLUSTERS) {
- ret = _get_cluster_clk_and_freq_table(cpu_dev);
+ ret = _get_cluster_clk_and_freq_table(cpu_dev, cpumask);
if (ret)
atomic_dec(&cluster_usage[cluster]);
return ret;
@@ -407,7 +411,7 @@ static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
return -ENODEV;
}

- ret = _get_cluster_clk_and_freq_table(cdev);
+ ret = _get_cluster_clk_and_freq_table(cdev, cpumask);
if (ret)
goto put_clusters;
}
@@ -433,7 +437,7 @@ static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
return -ENODEV;
}

- _put_cluster_clk_and_freq_table(cdev);
+ _put_cluster_clk_and_freq_table(cdev, cpumask);
}

atomic_dec(&cluster_usage[cluster]);
@@ -455,18 +459,6 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
return -ENODEV;
}

- ret = get_cluster_clk_and_freq_table(cpu_dev);
- if (ret)
- return ret;
-
- ret = cpufreq_table_validate_and_show(policy, freq_table[cur_cluster]);
- if (ret) {
- dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
- policy->cpu, cur_cluster);
- put_cluster_clk_and_freq_table(cpu_dev);
- return ret;
- }
-
if (cur_cluster < MAX_CLUSTERS) {
int cpu;

@@ -479,6 +471,18 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
per_cpu(physical_cluster, policy->cpu) = A15_CLUSTER;
}

+ ret = get_cluster_clk_and_freq_table(cpu_dev, policy->cpus);
+ if (ret)
+ return ret;
+
+ ret = cpufreq_table_validate_and_show(policy, freq_table[cur_cluster]);
+ if (ret) {
+ dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
+ policy->cpu, cur_cluster);
+ put_cluster_clk_and_freq_table(cpu_dev, policy->cpus);
+ return ret;
+ }
+
if (arm_bL_ops->get_transition_latency)
policy->cpuinfo.transition_latency =
arm_bL_ops->get_transition_latency(cpu_dev);
@@ -509,7 +513,7 @@ static int bL_cpufreq_exit(struct cpufreq_policy *policy)
return -ENODEV;
}

- put_cluster_clk_and_freq_table(cpu_dev);
+ put_cluster_clk_and_freq_table(cpu_dev, policy->related_cpus);
dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);

return 0;
diff --git a/drivers/cpufreq/arm_big_little.h b/drivers/cpufreq/arm_big_little.h
index b88889d9387e..adb32c36903b 100644
--- a/drivers/cpufreq/arm_big_little.h
+++ b/drivers/cpufreq/arm_big_little.h
@@ -30,11 +30,11 @@ struct cpufreq_arm_bL_ops {
* This must set opp table for cpu_dev in a similar way as done by
* dev_pm_opp_of_add_table().
*/
- int (*init_opp_table)(struct device *cpu_dev);
+ int (*init_opp_table)(cpumask_var_t cpumask);

/* Optional */
int (*get_transition_latency)(struct device *cpu_dev);
- void (*free_opp_table)(struct device *cpu_dev);
+ void (*free_opp_table)(cpumask_var_t cpumask);
};

int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c
index a8ff5e590125..8a66154a0cfd 100644
--- a/drivers/cpufreq/arm_big_little_dt.c
+++ b/drivers/cpufreq/arm_big_little_dt.c
@@ -43,23 +43,6 @@ static struct device_node *get_cpu_node_with_valid_op(int cpu)
return np;
}

-static int dt_init_opp_table(struct device *cpu_dev)
-{
- struct device_node *np;
- int ret;
-
- np = of_node_get(cpu_dev->of_node);
- if (!np) {
- pr_err("failed to find cpu%d node\n", cpu_dev->id);
- return -ENOENT;
- }
-
- ret = dev_pm_opp_of_add_table(cpu_dev);
- of_node_put(np);
-
- return ret;
-}
-
static int dt_get_transition_latency(struct device *cpu_dev)
{
struct device_node *np;
@@ -81,8 +64,8 @@ static int dt_get_transition_latency(struct device *cpu_dev)
static struct cpufreq_arm_bL_ops dt_bL_ops = {
.name = "dt-bl",
.get_transition_latency = dt_get_transition_latency,
- .init_opp_table = dt_init_opp_table,
- .free_opp_table = dev_pm_opp_remove_table,
+ .init_opp_table = dev_pm_opp_of_cpumask_add_table,
+ .free_opp_table = dev_pm_opp_cpumask_remove_table,
};

static int generic_bL_probe(struct platform_device *pdev)
diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c
index de5e89b2eaaa..83bd6050f227 100644
--- a/drivers/cpufreq/scpi-cpufreq.c
+++ b/drivers/cpufreq/scpi-cpufreq.c
@@ -18,6 +18,7 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

+#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -76,13 +77,30 @@ static int scpi_get_transition_latency(struct device *cpu_dev)
return info->latency;
}

-static int scpi_init_opp_table(struct device *cpu_dev)
+static int scpi_init_opp_table(cpumask_var_t cpumask)
{
- return scpi_opp_table_ops(cpu_dev, false);
+ int ret;
+ struct device *cpu_dev = get_cpu_device(cpumask_first(cpumask));
+
+ ret = scpi_opp_table_ops(cpu_dev, false);
+ if (ret)
+ return ret;
+
+ ret = dev_pm_opp_set_sharing_cpus(cpu_dev, cpumask);
+ if (ret)
+ dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
+ __func__, ret);
+ return ret;
}

-static void scpi_free_opp_table(struct device *cpu_dev)
+static void scpi_free_opp_table(cpumask_var_t cpumask)
{
+ struct device *cpu_dev = get_cpu_device(cpumask_first(cpumask));
+
+ cpumask_clear_cpu(cpu_dev->id, cpumask);
+ dev_pm_opp_cpumask_remove_table(cpumask);
+ cpumask_set_cpu(cpu_dev->id, cpumask);
+
scpi_opp_table_ops(cpu_dev, true);
}

--
1.9.1
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