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SubjectRe: [PATCH 01/22] cpufreq/acpi-cpufreq: Convert to hotplug state machine
On 27-11-16, 00:13, Sebastian Andrzej Siewior wrote:
> Install the callbacks via the state machine.
>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
> drivers/cpufreq/acpi-cpufreq.c | 93 ++++++++++++++++++++----------------------
> 1 file changed, 45 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index 297e9128fe9f..2c29cbaca7b5 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -536,46 +536,33 @@ static void free_acpi_perf_data(void)
> free_percpu(acpi_perf_data);
> }
>
> -static int boost_notify(struct notifier_block *nb, unsigned long action,
> - void *hcpu)
> +static int cpufreq_boost_online(unsigned int cpu)
> +{
> + const struct cpumask *cpumask;
> +
> + cpumask = get_cpu_mask(cpu);
> + /*
> + * On the CPU_UP path we simply keep the boost-disable flag
> + * in sync with the current global state.
> + */
> + boost_set_msrs(acpi_cpufreq_driver.boost_enabled, cpumask);
> + return 0;
> +}
> +
> +static int cpufreq_boost_down_prep(unsigned int cpu)
> {
> - unsigned cpu = (long)hcpu;
> const struct cpumask *cpumask;
>
> cpumask = get_cpu_mask(cpu);
>
> /*
> * Clear the boost-disable bit on the CPU_DOWN path so that
> - * this cpu cannot block the remaining ones from boosting. On
> - * the CPU_UP path we simply keep the boost-disable flag in
> - * sync with the current global state.
> + * this cpu cannot block the remaining ones from boosting.
> */
> -
> - switch (action) {
> - case CPU_DOWN_FAILED:
> - case CPU_DOWN_FAILED_FROZEN:
> - case CPU_ONLINE:
> - case CPU_ONLINE_FROZEN:
> - boost_set_msrs(acpi_cpufreq_driver.boost_enabled, cpumask);
> - break;
> -
> - case CPU_DOWN_PREPARE:
> - case CPU_DOWN_PREPARE_FROZEN:
> - boost_set_msrs(1, cpumask);
> - break;
> -
> - default:
> - break;
> - }
> -
> - return NOTIFY_OK;
> + boost_set_msrs(1, cpumask);
> + return 0;
> }
>
> -
> -static struct notifier_block boost_nb = {
> - .notifier_call = boost_notify,
> -};
> -
> /*
> * acpi_cpufreq_early_init - initialize ACPI P-States library
> *
> @@ -922,37 +909,47 @@ static struct cpufreq_driver acpi_cpufreq_driver = {
> .attr = acpi_cpufreq_attr,
> };
>
> +static enum cpuhp_state acpi_cpufreq_online;
> +
> static void __init acpi_cpufreq_boost_init(void)
> {
> - if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
> - msrs = msrs_alloc();
> + int ret;
>
> - if (!msrs)
> - return;
> + if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)))
> + return;
>
> - acpi_cpufreq_driver.set_boost = set_boost;
> - acpi_cpufreq_driver.boost_enabled = boost_state(0);
> + msrs = msrs_alloc();
>
> - cpu_notifier_register_begin();
> + if (!msrs)
> + return;
>
> - /* Force all MSRs to the same value */
> - boost_set_msrs(acpi_cpufreq_driver.boost_enabled,
> - cpu_online_mask);

Why isn't this required anymore ?

> + acpi_cpufreq_driver.set_boost = set_boost;
> + acpi_cpufreq_driver.boost_enabled = boost_state(0);
>
> - __register_cpu_notifier(&boost_nb);
> -
> - cpu_notifier_register_done();
> + /*
> + * This calls the online callback on all online cpu and forces all
> + * MSRs to the same value.
> + */
> + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "cpufreq/acpi:online",
> + cpufreq_boost_online, cpufreq_boost_down_prep);
> + if (ret < 0) {
> + pr_err("acpi_cpufreq: failed to register hotplug callbacks\n");
> + msrs_free(msrs);

If 'msrs = NULL' is required to be done in the _exit() routine, then it should
be done here as well. Right?

> + return;
> }
> + acpi_cpufreq_online = ret;
> }
>
> static void acpi_cpufreq_boost_exit(void)
> {
> - if (msrs) {
> - unregister_cpu_notifier(&boost_nb);
> + if (!msrs)
> + return;
>
> - msrs_free(msrs);
> - msrs = NULL;
> - }
> + if (acpi_cpufreq_online >= 0)
> + cpuhp_remove_state_nocalls(acpi_cpufreq_online);
> +
> + msrs_free(msrs);
> + msrs = NULL;
> }
>
> static int __init acpi_cpufreq_init(void)
> --
> 2.10.2

--
viresh

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