linux-kernel - Re: [PATCH v4 17/20] ACPI: platform_profile: Check all profile handler to calculate next

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Message-ID: <2d9e5ff1-1e4b-4e50-86bd-970c652c39c7@gmx.de>
Date: Wed, 6 Nov 2024 21:55:40 +0100
From: Armin Wolf <W_Armin@....de>
To: Mario Limonciello <mario.limonciello@....com>,
 Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
 Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>,
 Corentin Chary <corentin.chary@...il.com>, "Luke D . Jones"
 <luke@...nes.dev>, Ike Panhc <ike.pan@...onical.com>,
 Henrique de Moraes Holschuh <hmh@....eng.br>,
 Alexis Belmonte <alexbelm48@...il.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 Ai Chao <aichao@...inos.cn>, Gergo Koteles <soyer@....hu>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:ACPI" <linux-acpi@...r.kernel.org>,
 "open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER"
 <platform-driver-x86@...r.kernel.org>,
 "open list:THINKPAD ACPI EXTRAS DRIVER"
 <ibm-acpi-devel@...ts.sourceforge.net>,
 Mark Pearson <mpearson-lenovo@...ebb.ca>,
 Matthew Schwartz <matthew.schwartz@...ux.dev>
Subject: Re: [PATCH v4 17/20] ACPI: platform_profile: Check all profile
 handler to calculate next

Am 05.11.24 um 16:33 schrieb Mario Limonciello:

> As multiple platform profile handlers might not all support the same
> profile, cycling to the next profile could have a different result
> depending on what handler are registered.
>
> Check what is active and supported by all handlers to decide what
> to do.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   drivers/acpi/platform_profile.c | 35 ++++++++++++++++++---------------
>   1 file changed, 19 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 7861fccc2e58c..568485e285061 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -378,34 +378,37 @@ EXPORT_SYMBOL_GPL(platform_profile_notify);
>
>   int platform_profile_cycle(void)
>   {
> +	enum platform_profile_option next = PLATFORM_PROFILE_LAST;
>   	enum platform_profile_option profile;
> -	enum platform_profile_option next;
> +	unsigned long choices;
>   	int err;
>
>   	if (!class_is_registered(&platform_profile_class))
>   		return -ENODEV;
>
> -	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {

Since the aggregated choices might change at any moment, we still need
some locking here.

Thanks,
Armin Wolf

> -		if (!cur_profile)
> -			return -ENODEV;
> +	err = class_for_each_device(&platform_profile_class, NULL,
> +				    &profile, _aggregate_profiles);
> +	if (err)
> +		return err;
>
> -		err = cur_profile->profile_get(cur_profile, &profile);
> -		if (err)
> -			return err;
> +	err = class_for_each_device(&platform_profile_class, NULL,
> +				    &choices, _aggregate_choices);
> +	if (err)
> +		return err;
>
> -		next = find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST,
> -					  profile + 1);
> +	next = find_next_bit_wrap(&choices,
> +				  PLATFORM_PROFILE_LAST,
> +				  profile + 1);
>
> -		if (WARN_ON(next == PLATFORM_PROFILE_LAST))
> -			return -EINVAL;
> +	err = class_for_each_device(&platform_profile_class, NULL, &next,
> +				    _store_class_profile);
>
> -		err = cur_profile->profile_set(cur_profile, next);
> -		if (err)
> -			return err;
> -	}
> +	if (err)
> +		return err;
>
>   	sysfs_notify(acpi_kobj, NULL, "platform_profile");
> -	return 0;
> +
> +	return err;
>   }
>   EXPORT_SYMBOL_GPL(platform_profile_cycle);
>