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Subject[PATCH v5 1/2] cpufreq: change '.set_boost' to act on only one policy
Date
Macro 'for_each_active_policy()' is defined internally. To avoid some
cpufreq driver needing this macro to iterate over all the policies in
'.set_boost' callback, we redefine '.set_boost' to act on only one
policy and pass the policy as an argument.
'cpufreq_boost_trigger_state()' iterate over all the policies to set
boost for the system. This is preparation for adding SW BOOST support
for CPPC.

To protect Boost enable/disable by sysfs from CPU online/offline, we
add 'cpu_hotplug_lock' before calling '.set_boost' for each CPU. Also we
move the lock from 'set_boost()' to 'store_cpb()' for acpi_cpufreq.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/cpufreq/acpi-cpufreq.c | 14 ++++++-----
drivers/cpufreq/cpufreq.c | 57 +++++++++++++++++++++++-------------------
include/linux/cpufreq.h | 2 +-
3 files changed, 40 insertions(+), 33 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 289e8ce..429e5a3 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -126,12 +126,12 @@ static void boost_set_msr_each(void *p_en)
boost_set_msr(enable);
}

-static int set_boost(int val)
+static int set_boost(struct cpufreq_policy *policy, int val)
{
- get_online_cpus();
- on_each_cpu(boost_set_msr_each, (void *)(long)val, 1);
- put_online_cpus();
- pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
+ on_each_cpu_mask(policy->cpus, boost_set_msr_each,
+ (void *)(long)val, 1);
+ pr_debug("CPU %*pbl: Core Boosting %sabled.\n",
+ cpumask_pr_args(policy->cpus), val ? "en" : "dis");

return 0;
}
@@ -162,7 +162,9 @@ static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
if (ret || val > 1)
return -EINVAL;

- set_boost(val);
+ get_online_cpus();
+ set_boost(policy, val);
+ put_online_cpus();

return count;
}
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index d03f250..0128de3 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2532,34 +2532,29 @@ void cpufreq_update_limits(unsigned int cpu)
/*********************************************************************
* BOOST *
*********************************************************************/
-static int cpufreq_boost_set_sw(int state)
+static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
{
- struct cpufreq_policy *policy;
-
- for_each_active_policy(policy) {
- int ret;
+ int ret;

- if (!policy->freq_table)
- return -ENXIO;
+ if (!policy->freq_table)
+ return -ENXIO;

- ret = cpufreq_frequency_table_cpuinfo(policy,
- policy->freq_table);
- if (ret) {
- pr_err("%s: Policy frequency update failed\n",
- __func__);
- return ret;
- }
-
- ret = freq_qos_update_request(policy->max_freq_req, policy->max);
- if (ret < 0)
- return ret;
+ ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
+ if (ret) {
+ pr_err("%s: Policy frequency update failed\n", __func__);
+ return ret;
}

+ ret = freq_qos_update_request(policy->max_freq_req, policy->max);
+ if (ret < 0)
+ return ret;
+
return 0;
}

int cpufreq_boost_trigger_state(int state)
{
+ struct cpufreq_policy *policy;
unsigned long flags;
int ret = 0;

@@ -2570,15 +2565,25 @@ int cpufreq_boost_trigger_state(int state)
cpufreq_driver->boost_enabled = state;
write_unlock_irqrestore(&cpufreq_driver_lock, flags);

- ret = cpufreq_driver->set_boost(state);
- if (ret) {
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver->boost_enabled = !state;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- pr_err("%s: Cannot %s BOOST\n",
- __func__, state ? "enable" : "disable");
+ get_online_cpus();
+ for_each_active_policy(policy) {
+ ret = cpufreq_driver->set_boost(policy, state);
+ if (ret)
+ goto err_reset_state;
}
+ put_online_cpus();
+
+ return 0;
+
+err_reset_state:
+ put_online_cpus();
+
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ cpufreq_driver->boost_enabled = !state;
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ pr_err("%s: Cannot %s BOOST\n",
+ __func__, state ? "enable" : "disable");

return ret;
}
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 67d5950..3494f67 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -367,7 +367,7 @@ struct cpufreq_driver {

/* platform specific boost support code */
bool boost_enabled;
- int (*set_boost)(int state);
+ int (*set_boost)(struct cpufreq_policy *policy, int state);
};

/* flags */
--
1.7.12.4
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