From e788892ba3cc71d385b75895f7a375fbc659ce86 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 2 Jun 2016 23:24:15 +0200 Subject: cpufreq: governor: Get rid of governor events The design of the cpufreq governor API is not very straightforward, as struct cpufreq_governor provides only one callback to be invoked from different code paths for different purposes. The purpose it is invoked for is determined by its second "event" argument, causing it to act as a "callback multiplexer" of sorts. Unfortunately, that leads to extra complexity in governors, some of which implement the ->governor() callback as a switch statement that simply checks the event argument and invokes a separate function to handle that specific event. That extra complexity can be eliminated by replacing the all-purpose ->governor() callback with a family of callbacks to carry out specific governor operations: initialization and exit, start and stop and policy limits updates. That also turns out to reduce the code size too, so do it. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- kernel/sched/cpufreq_schedutil.c | 34 ++++++++-------------------------- 1 file changed, 8 insertions(+), 26 deletions(-) (limited to 'kernel') diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 14c4aa2..fdcee3c 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -394,7 +394,7 @@ static int sugov_init(struct cpufreq_policy *policy) return ret; } -static int sugov_exit(struct cpufreq_policy *policy) +static void sugov_exit(struct cpufreq_policy *policy) { struct sugov_policy *sg_policy = policy->governor_data; struct sugov_tunables *tunables = sg_policy->tunables; @@ -412,7 +412,6 @@ static int sugov_exit(struct cpufreq_policy *policy) mutex_unlock(&global_tunables_lock); sugov_policy_free(sg_policy); - return 0; } static int sugov_start(struct cpufreq_policy *policy) @@ -444,7 +443,7 @@ static int sugov_start(struct cpufreq_policy *policy) return 0; } -static int sugov_stop(struct cpufreq_policy *policy) +static void sugov_stop(struct cpufreq_policy *policy) { struct sugov_policy *sg_policy = policy->governor_data; unsigned int cpu; @@ -456,10 +455,9 @@ static int sugov_stop(struct cpufreq_policy *policy) irq_work_sync(&sg_policy->irq_work); cancel_work_sync(&sg_policy->work); - return 0; } -static int sugov_limits(struct cpufreq_policy *policy) +static void sugov_limits(struct cpufreq_policy *policy) { struct sugov_policy *sg_policy = policy->governor_data; @@ -477,32 +475,16 @@ static int sugov_limits(struct cpufreq_policy *policy) } sg_policy->need_freq_update = true; - return 0; -} - -int sugov_governor(struct cpufreq_policy *policy, unsigned int event) -{ - if (event == CPUFREQ_GOV_POLICY_INIT) { - return sugov_init(policy); - } else if (policy->governor_data) { - switch (event) { - case CPUFREQ_GOV_POLICY_EXIT: - return sugov_exit(policy); - case CPUFREQ_GOV_START: - return sugov_start(policy); - case CPUFREQ_GOV_STOP: - return sugov_stop(policy); - case CPUFREQ_GOV_LIMITS: - return sugov_limits(policy); - } - } - return -EINVAL; } static struct cpufreq_governor schedutil_gov = { .name = "schedutil", - .governor = sugov_governor, .owner = THIS_MODULE, + .init = sugov_init, + .exit = sugov_exit, + .start = sugov_start, + .stop = sugov_stop, + .limits = sugov_limits, }; static int __init sugov_module_init(void) -- cgit v1.1 From bf2be2de8493dd5f86d6e0f0d4eecb5810ad035b Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 18 May 2016 17:55:31 +0530 Subject: cpufreq: governor: Create cpufreq_policy_apply_limits() Create a new helper to avoid code duplication across governors. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- kernel/sched/cpufreq_schedutil.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'kernel') diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index fdcee3c..758efd7 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -463,14 +463,7 @@ static void sugov_limits(struct cpufreq_policy *policy) if (!policy->fast_switch_enabled) { mutex_lock(&sg_policy->work_lock); - - if (policy->max < policy->cur) - __cpufreq_driver_target(policy, policy->max, - CPUFREQ_RELATION_H); - else if (policy->min > policy->cur) - __cpufreq_driver_target(policy, policy->min, - CPUFREQ_RELATION_L); - + cpufreq_policy_apply_limits(policy); mutex_unlock(&sg_policy->work_lock); } -- cgit v1.1