RE: [PATCH V11 4/7] cpufreq: Add a notification message that the highest perf has changed

[Yuan, Perry]

[AMD Official Use Only - General]

> -----Original Message-----
> From: Meng, Li (Jassmine) <Li.Meng@xxxxxxx>
> Sent: Wednesday, November 29, 2023 2:55 PM
> To: Rafael J . Wysocki <rafael.j.wysocki@xxxxxxxxx>; Huang, Ray
> <Ray.Huang@xxxxxxx>
> Cc: linux-pm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx;
> linux-acpi@xxxxxxxxxxxxxxx; Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>; linux-
> kselftest@xxxxxxxxxxxxxxx; Fontenot, Nathan <Nathan.Fontenot@xxxxxxx>;
> Sharma, Deepak <Deepak.Sharma@xxxxxxx>; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; Limonciello, Mario
> <Mario.Limonciello@xxxxxxx>; Huang, Shimmer
> <Shimmer.Huang@xxxxxxx>; Yuan, Perry <Perry.Yuan@xxxxxxx>; Du,
> Xiaojian <Xiaojian.Du@xxxxxxx>; Viresh Kumar <viresh.kumar@xxxxxxxxxx>;
> Borislav Petkov <bp@xxxxxxxxx>; Oleksandr Natalenko
> <oleksandr@xxxxxxxxxxxxxx>; Meng, Li (Jassmine) <Li.Meng@xxxxxxx>
> Subject: [PATCH V11 4/7] cpufreq: Add a notification message that the
> highest perf has changed
>
> ACPI 6.5 section 8.4.6.1.1.1 specifies that Notify event 0x85 can be emmitted
> to cause the the OSPM to re-evaluate the highest performance register. Add
> support for this event.
>
> Tested-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
> Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> Reviewed-by: Huang Rui <ray.huang@xxxxxxx>
> Signed-off-by: Meng Li <li.meng@xxxxxxx>
> Link:
> https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.ht
> ml#processor-device-notification-values
> ---
>  drivers/acpi/processor_driver.c |  6 ++++++
>  drivers/cpufreq/cpufreq.c       | 13 +++++++++++++
>  include/linux/cpufreq.h         |  5 +++++
>  3 files changed, 24 insertions(+)
>
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index 4bd16b3f0781..29b2fb68a35d 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -27,6 +27,7 @@
>  #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
>  #define ACPI_PROCESSOR_NOTIFY_POWER  0x81
>  #define ACPI_PROCESSOR_NOTIFY_THROTTLING     0x82
> +#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED    0x85
>
>  MODULE_AUTHOR("Paul Diefenbaugh");
>  MODULE_DESCRIPTION("ACPI Processor Driver"); @@ -83,6 +84,11 @@
> static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
>               acpi_bus_generate_netlink_event(device->pnp.device_class,
>                                                 dev_name(&device->dev),
> event, 0);
>               break;
> +     case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:
> +             cpufreq_update_highest_perf(pr->id);
> +             acpi_bus_generate_netlink_event(device->pnp.device_class,
> +                                               dev_name(&device->dev),
> event, 0);
> +             break;
>       default:
>               acpi_handle_debug(handle, "Unsupported event [0x%x]\n",
> event);
>               break;
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index
> 934d35f570b7..14a4cbc6dd05 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -2717,6 +2717,19 @@ void cpufreq_update_limits(unsigned int cpu)  }
> EXPORT_SYMBOL_GPL(cpufreq_update_limits);
>
> +/**
> + * cpufreq_update_highest_perf - Update highest performance for a given
> CPU.
> + * @cpu: CPU to update the highest performance for.
> + *
> + * Invoke the driver's ->update_highest_perf callback if present  */
> +void cpufreq_update_highest_perf(unsigned int cpu) {
> +     if (cpufreq_driver->update_highest_perf)
> +             cpufreq_driver->update_highest_perf(cpu);
> +}
> +EXPORT_SYMBOL_GPL(cpufreq_update_highest_perf);
> +
>
> /******************************************************************
> ***
>   *               BOOST                                                    *
>
> *******************************************************************
> **/
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index
> 1c5ca92a0555..f62257b2a42f 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -235,6 +235,7 @@ int cpufreq_get_policy(struct cpufreq_policy *policy,
> unsigned int cpu);  void refresh_frequency_limits(struct cpufreq_policy
> *policy);  void cpufreq_update_policy(unsigned int cpu);  void
> cpufreq_update_limits(unsigned int cpu);
> +void cpufreq_update_highest_perf(unsigned int cpu);
>  bool have_governor_per_policy(void);
>  bool cpufreq_supports_freq_invariance(void);
>  struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
> @@ -263,6 +264,7 @@ static inline bool
> cpufreq_supports_freq_invariance(void)
>       return false;
>  }
>  static inline void disable_cpufreq(void) { }
> +static inline void cpufreq_update_highest_perf(unsigned int cpu) { }
>  #endif
>
>  #ifdef CONFIG_CPU_FREQ_STAT
> @@ -380,6 +382,9 @@ struct cpufreq_driver {
>       /* Called to update policy limits on firmware notifications. */
>       void            (*update_limits)(unsigned int cpu);
>
> +     /* Called to update highest performance on firmware notifications. */
> +     void            (*update_highest_perf)(unsigned int cpu);
> +
>       /* optional */
>       int             (*bios_limit)(int cpu, unsigned int *limit);
>
> --
> 2.34.1


Reviewed-by: Perry Yuan <perry.yuan@xxxxxxx>