linux-kernel - Re: [PATCH v6 18/22] ACPI: platform_profile: Check all profile handler to calculate next

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Message-ID: <3331c9f8-0590-4d3d-b9ae-7bdc22473d7a@gmx.de>
Date: Tue, 19 Nov 2024 14:00:11 +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 v6 18/22] ACPI: platform_profile: Check all profile
 handler to calculate next

Am 18.11.24 um 20:53 schrieb Armin Wolf:

> Am 09.11.24 um 05:41 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.
>
> Reviewed-by: Armin Wolf <W_Armin@....de>
>
>> Tested-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>> ---
>> v6:
>>   * Handle cases of inconsistent profiles or all profile handlers
>>     supporting custom.
>> v5:
>>   * Adjust mutex use
>> ---
>>   drivers/acpi/platform_profile.c | 30 +++++++++++++++++++++---------
>>   1 file changed, 21 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/acpi/platform_profile.c 
>> b/drivers/acpi/platform_profile.c
>> index 2676f4a13689e..c574483be4fd1 100644
>> --- a/drivers/acpi/platform_profile.c
>> +++ b/drivers/acpi/platform_profile.c
>> @@ -423,28 +423,40 @@ EXPORT_SYMBOL_GPL(platform_profile_notify);
>>
>>   int platform_profile_cycle(void)
>>   {
>> -    enum platform_profile_option profile;
>> -    enum platform_profile_option next;
>> +    enum platform_profile_option next = PLATFORM_PROFILE_LAST;
>> +    enum platform_profile_option profile = PLATFORM_PROFILE_LAST;
>> +    unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
>>       int err;
>>
>>       if (!class_is_registered(&platform_profile_class))
>>           return -ENODEV;
>>
>> +    set_bit(PLATFORM_PROFILE_LAST, choices);
>>       scoped_cond_guard(mutex_intr, return -ERESTARTSYS, 
>> &profile_lock) {
>> -        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 (profile == PLATFORM_PROFILE_CUSTOM ||
>> +            profile == PLATFORM_PROFILE_LAST)
>> +            return -EINVAL;
>> +
>> +        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,
>> +        /* never iterate into a custom if all drivers supported it */
>> +        clear_bit(PLATFORM_PROFILE_CUSTOM, choices);
>> +
>> +        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);

I just noticed that the class device is not notified here. Please use _store_and_notify() insted of _store_class_profile()
here.

Thanks,
Armin Wolf

>>
>> -        err = cur_profile->profile_set(cur_profile, next);
>>           if (err)
>>               return err;
>>       }
>