linux-kernel - Re: [PATCH v5 1/3] ACPI: platform-profile: add platform_profile

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Date: Mon, 8 Apr 2024 18:41:39 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Gergo Koteles <soyer@....hu>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Len Brown <lenb@...nel.org>, Ike Panhc <ike.pan@...onical.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Henrique de Moraes Holschuh <hmh@....eng.br>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Barnabás Pőcze <pobrn@...tonmail.com>
Cc: linux-acpi@...r.kernel.org, ibm-acpi-devel@...ts.sourceforge.net,
 platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] ACPI: platform-profile: add
 platform_profile_cycle()

Hi Gergo,

On 4/6/24 2:01 AM, Gergo Koteles wrote:
> Some laptops have a key to switch platform profiles.
> 
> Add a platform_profile_cycle() function to cycle between the enabled
> profiles.
> 
> Signed-off-by: Gergo Koteles <soyer@....hu>

Thank you for your patch, 1 small remark below,
otherwise this looks good to me.

Rafael, may I have your Ack for merging this through the pdx86 tree
together with the rest of the series once my remark has been addressed ?

> ---
>  drivers/acpi/platform_profile.c  | 39 ++++++++++++++++++++++++++++++++
>  include/linux/platform_profile.h |  1 +
>  2 files changed, 40 insertions(+)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index d418462ab791..acc606af812a 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -136,6 +136,45 @@ void platform_profile_notify(void)
>  }
>  EXPORT_SYMBOL_GPL(platform_profile_notify);
>  
> +int platform_profile_cycle(void)
> +{
> +	enum platform_profile_option profile;
> +	enum platform_profile_option next;
> +	int err;
> +
> +	err = mutex_lock_interruptible(&profile_lock);
> +	if (err)
> +		return err;
> +
> +	if (!cur_profile) {
> +		mutex_unlock(&profile_lock);
> +		return -ENODEV;
> +	}
> +
> +	err = cur_profile->profile_get(cur_profile, &profile);
> +	if (err) {
> +		mutex_unlock(&profile_lock);
> +		return err;
> +	}
> +
> +	next = find_next_bit_wrap(cur_profile->choices,
> +				  ARRAY_SIZE(profile_names), profile + 1);
> +
> +	if (WARN_ON(next == ARRAY_SIZE(profile_names))) {

Other code in drivers/acpi/platform_profile.c uses PLATFORM_PROFILE_LAST
instead of ARRAY_SIZE(profile_names) (these are guaranteed to be equal)
please switch to using PLATFORM_PROFILE_LAST for consistency.

Regards,

Hans

> +		mutex_unlock(&profile_lock);
> +		return -EINVAL;
> +	}
> +
> +	err = cur_profile->profile_set(cur_profile, next);
> +	mutex_unlock(&profile_lock);
> +
> +	if (!err)
> +		sysfs_notify(acpi_kobj, NULL, "platform_profile");
> +
> +	return err;
> +}
> +EXPORT_SYMBOL_GPL(platform_profile_cycle);
> +
>  int platform_profile_register(struct platform_profile_handler *pprof)
>  {
>  	int err;
> diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
> index e5cbb6841f3a..f5492ed413f3 100644
> --- a/include/linux/platform_profile.h
> +++ b/include/linux/platform_profile.h
> @@ -36,6 +36,7 @@ struct platform_profile_handler {
>  
>  int platform_profile_register(struct platform_profile_handler *pprof);
>  int platform_profile_remove(void);
> +int platform_profile_cycle(void);
>  void platform_profile_notify(void);
>  
>  #endif  /*_PLATFORM_PROFILE_H_*/