From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: mark.rutland@arm.com, maz@kernel.org, suzuki.poulose@arm.com,
peterz@infradead.org, catalin.marinas@arm.com,
linux-pm@vger.kernel.org, linux-doc@vger.kernel.org,
rjw@rjwysocki.net, linux-kernel@vger.kernel.org,
mingo@redhat.com, linux-arm-kernel@lists.infradead.org,
sudeep.holla@arm.com, will@kernel.org,
valentin.schneider@arm.com, lukasz.luba@arm.com
Subject: Re: [PATCH v3 5/7] cpufreq: add function to get the hardware max frequency
Date: Wed, 12 Feb 2020 09:44:31 +0530 [thread overview]
Message-ID: <20200212041431.x5ginopepyyqu7wt@vireshk-i7> (raw)
In-Reply-To: <20200211184542.29585-6-ionela.voinescu@arm.com>
On 11-02-20, 18:45, Ionela Voinescu wrote:
> Add weak function to return the hardware maximum frequency of a
> CPU, with the default implementation returning cpuinfo.max_freq.
>
> The default can be overwritten by a strong function in platforms
> that want to provide an alternative implementation.
>
> Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> drivers/cpufreq/cpufreq.c | 20 ++++++++++++++++++++
> include/linux/cpufreq.h | 5 +++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 77114a3897fb..d2ff3018861d 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1733,6 +1733,26 @@ unsigned int cpufreq_quick_get_max(unsigned int cpu)
> }
> EXPORT_SYMBOL(cpufreq_quick_get_max);
>
> +/**
> + * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
> + * @cpu: CPU number
> + *
> + * The default return value is the max_freq field of cpuinfo.
> + */
> +__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
> +{
> + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
> + unsigned int ret_freq = 0;
> +
> + if (policy) {
> + ret_freq = policy->cpuinfo.max_freq;
> + cpufreq_cpu_put(policy);
> + }
> +
> + return ret_freq;
> +}
> +EXPORT_SYMBOL(cpufreq_get_hw_max_freq);
> +
> static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
> {
> if (unlikely(policy_is_inactive(policy)))
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 31b1b0e03df8..b4423ff619f4 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -194,6 +194,7 @@ extern struct kobject *cpufreq_global_kobject;
> unsigned int cpufreq_get(unsigned int cpu);
> unsigned int cpufreq_quick_get(unsigned int cpu);
> unsigned int cpufreq_quick_get_max(unsigned int cpu);
> +unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
> void disable_cpufreq(void);
>
> u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
> @@ -223,6 +224,10 @@ static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
> {
> return 0;
> }
> +static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
> +{
> + return 0;
> +}
> static inline void disable_cpufreq(void) { }
> #endif
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
--
viresh
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next prev parent reply other threads:[~2020-02-12 4:14 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 18:45 [PATCH v3 0/7] arm64: ARMv8.4 Activity Monitors support Ionela Voinescu
2020-02-11 18:45 ` [PATCH v3 1/7] arm64: add support for the AMU extension v1 Ionela Voinescu
2020-02-12 11:30 ` Suzuki Kuruppassery Poulose
2020-02-12 14:54 ` Valentin Schneider
2020-02-12 16:10 ` Ionela Voinescu
2020-02-12 16:20 ` Suzuki Kuruppassery Poulose
2020-02-12 18:20 ` Ionela Voinescu
2020-02-12 19:24 ` Suzuki K Poulose
2020-02-12 20:19 ` Ionela Voinescu
2020-02-12 16:24 ` Vladimir Murzin
2020-02-12 18:27 ` Ionela Voinescu
2020-02-11 18:45 ` [PATCH v3 2/7] arm64: trap to EL1 accesses to AMU counters from EL0 Ionela Voinescu
2020-02-12 11:44 ` Suzuki Kuruppassery Poulose
2020-02-12 15:36 ` Valentin Schneider
2020-02-11 18:45 ` [PATCH v3 3/7] arm64/kvm: disable access to AMU registers from kvm guests Ionela Voinescu
2020-02-12 15:36 ` Valentin Schneider
2020-02-12 16:33 ` Suzuki Kuruppassery Poulose
2020-02-11 18:45 ` [PATCH v3 4/7] Documentation: arm64: document support for the AMU extension Ionela Voinescu
2020-02-12 15:36 ` Valentin Schneider
2020-02-11 18:45 ` [PATCH v3 5/7] cpufreq: add function to get the hardware max frequency Ionela Voinescu
2020-02-12 4:14 ` Viresh Kumar [this message]
2020-02-13 11:59 ` Valentin Schneider
2020-02-13 12:59 ` Ionela Voinescu
2020-02-13 15:22 ` Valentin Schneider
2020-02-11 18:45 ` [PATCH v3 6/7] arm64: use activity monitors for frequency invariance Ionela Voinescu
2020-02-12 18:59 ` Lukasz Luba
2020-02-13 9:47 ` Ionela Voinescu
2020-02-17 16:59 ` Valentin Schneider
2020-02-23 18:49 ` Ionela Voinescu
2020-02-11 18:45 ` [PATCH v3 7/7] clocksource/drivers/arm_arch_timer: validate arch_timer_rate Ionela Voinescu
2020-02-12 9:30 ` Valentin Schneider
2020-02-12 10:32 ` Ionela Voinescu
2020-02-12 10:01 ` Lukasz Luba
2020-02-12 10:12 ` Marc Zyngier
2020-02-12 10:54 ` Ionela Voinescu
2020-02-12 10:55 ` Lukasz Luba
2020-02-12 11:10 ` Marc Zyngier
2020-02-12 11:43 ` Lukasz Luba
2020-02-12 11:12 ` Valentin Schneider
2020-02-14 0:35 ` Thomas Gleixner
2020-02-14 15:45 ` Ionela Voinescu
2020-02-14 15:57 ` Ionela Voinescu
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