From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: rjw@rjwysocki.net, catalin.marinas@arm.com, sudeep.holla@arm.com,
will@kernel.org, linux@armlinux.org.uk,
valentin.schneider@arm.com, mingo@redhat.com,
peterz@infradead.org, dietmar.eggemann@arm.com,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/8] cpufreq: report whether cpufreq supports Frequency Invariance (FI)
Date: Wed, 1 Jul 2020 16:16:20 +0530 [thread overview]
Message-ID: <20200701104620.lxhxty7gymjlagp6@vireshk-i7> (raw)
In-Reply-To: <20200701090751.7543-6-ionela.voinescu@arm.com>
On 01-07-20, 10:07, Ionela Voinescu wrote:
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 83b58483a39b..60b5272c5d80 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -59,6 +59,9 @@ static struct cpufreq_driver *cpufreq_driver;
> static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
> static DEFINE_RWLOCK(cpufreq_driver_lock);
>
> +/* Mark support for the scheduler's frequency invariance engine */
> +static DEFINE_STATIC_KEY_FALSE(cpufreq_set_freq_scale);
> +
> /* Flag to suspend/resume CPUFreq governors */
> static bool cpufreq_suspended;
>
> @@ -67,6 +70,26 @@ static inline bool has_target(void)
> return cpufreq_driver->target_index || cpufreq_driver->target;
> }
>
> +static inline
> +void enable_cpufreq_freq_invariance(struct cpufreq_driver *driver)
> +{
> + if ((driver->flags & CPUFREQ_CUSTOM_SET_FREQ_SCALE) ||
> + ((driver->target_index || driver->fast_switch)
> + && !(driver->target || driver->setpolicy))) {
This will get simplified with the way I suggested it I believe.
> +
> + static_branch_enable_cpuslocked(&cpufreq_set_freq_scale);
> + pr_debug("%s: Driver %s can provide frequency invariance.",
> + __func__, driver->name);
> + } else
> + pr_err("%s: Driver %s cannot provide frequency invariance.",
> + __func__, driver->name);
> +}
> +
> +bool cpufreq_sets_freq_scale(void)
> +{
> + return static_branch_likely(&cpufreq_set_freq_scale);
> +}
> +
> /* internal prototypes */
> static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
> static int cpufreq_init_governor(struct cpufreq_policy *policy);
> @@ -2713,6 +2736,8 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
> cpufreq_driver = driver_data;
> write_unlock_irqrestore(&cpufreq_driver_lock, flags);
>
> + enable_cpufreq_freq_invariance(cpufreq_driver);
> +
> if (driver_data->setpolicy)
> driver_data->flags |= CPUFREQ_CONST_LOOPS;
>
> @@ -2782,6 +2807,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
> cpus_read_lock();
> subsys_interface_unregister(&cpufreq_interface);
> remove_boost_sysfs_file();
> + static_branch_disable_cpuslocked(&cpufreq_set_freq_scale);
> cpuhp_remove_state_nocalls_cpuslocked(hp_online);
>
> write_lock_irqsave(&cpufreq_driver_lock, flags);
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 42668588f9f8..8b6369d657bd 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -217,6 +217,7 @@ void refresh_frequency_limits(struct cpufreq_policy *policy);
> void cpufreq_update_policy(unsigned int cpu);
> void cpufreq_update_limits(unsigned int cpu);
> bool have_governor_per_policy(void);
> +bool cpufreq_sets_freq_scale(void);
> struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
> void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
> void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
> @@ -237,6 +238,10 @@ static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
> {
> return 0;
> }
> +static inline bool cpufreq_sets_freq_scale(void)
> +{
> + return false;
> +}
> static inline void disable_cpufreq(void) { }
> #endif
>
> --
> 2.17.1
--
viresh
next prev parent reply other threads:[~2020-07-01 10:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-01 9:07 [PATCH 0/8] cpufreq: improve frequency invariance support Ionela Voinescu
2020-07-01 9:07 ` [PATCH 1/8] cpufreq: allow drivers to flag custom support for freq invariance Ionela Voinescu
2020-07-01 10:46 ` Viresh Kumar
2020-07-01 13:33 ` Ionela Voinescu
2020-07-01 16:05 ` Rafael J. Wysocki
2020-07-01 18:06 ` Ionela Voinescu
2020-07-02 2:58 ` Viresh Kumar
2020-07-02 11:44 ` Ionela Voinescu
2020-07-06 12:14 ` Dietmar Eggemann
2020-07-09 8:53 ` Ionela Voinescu
2020-07-09 9:09 ` Viresh Kumar
2020-07-01 9:07 ` [PATCH 2/8] cpufreq: move invariance setter calls in cpufreq core Ionela Voinescu
2020-07-01 10:46 ` Viresh Kumar
2020-07-01 15:27 ` Ionela Voinescu
2020-07-01 15:51 ` Rafael J. Wysocki
2020-07-02 3:01 ` Viresh Kumar
2020-07-02 11:45 ` Ionela Voinescu
2020-07-01 9:07 ` [PATCH 3/8] cpufreq,drivers: remove setting of frequency scale factor Ionela Voinescu
2020-07-01 9:07 ` [PATCH 4/8] cpufreq,vexpress-spc: fix Frequency Invariance (FI) for bL switching Ionela Voinescu
2020-07-01 10:46 ` Viresh Kumar
2020-07-01 14:07 ` Ionela Voinescu
2020-07-02 3:05 ` Viresh Kumar
2020-07-02 11:41 ` Ionela Voinescu
2020-07-02 11:46 ` Viresh Kumar
2020-07-01 9:07 ` [PATCH 5/8] cpufreq: report whether cpufreq supports Frequency Invariance (FI) Ionela Voinescu
2020-07-01 10:46 ` Viresh Kumar [this message]
2020-07-01 9:07 ` [PATCH 6/8] arch_topology,cpufreq,sched/core: constify arch_* cpumasks Ionela Voinescu
2020-07-01 9:07 ` [PATCH 7/8] arch_topology,arm64: define arch_scale_freq_invariant() Ionela Voinescu
2020-07-01 9:07 ` [PATCH 8/8] cpufreq: make schedutil the default for arm and arm64 Ionela Voinescu
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