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cpufreq: change '.set_boost' to act on one policy 

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()' iterates 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,
add 'cpu_hotplug_lock' before calling '.set_boost' for each CPU.

Also move the lock from 'set_boost()' to 'store_cpb()' in
acpi_cpufreq.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Xiongfeng Wang 2020-05-30 10:08:30 +08:00 committed by Rafael J. Wysocki
parent 73e5f9c0d3
commit cf6fada715
3 changed files with 40 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/cpufreq/acpi-cpufreq.c
View File

@ -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;
}

57
drivers/cpufreq/cpufreq.c
View File

@ -2532,34 +2532,29 @@ EXPORT_SYMBOL_GPL(cpufreq_update_limits);
/*********************************************************************
* 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;
int ret;
for_each_active_policy(policy) {
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;
}

2
include/linux/cpufreq.h
View File

@ -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 */