linux-kernel - Re: [PATCH v9 15/22] ACPI: platform_profile: Only show profiles common for all handlers

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Message-ID: <eff0923a-0207-3a0f-43f8-699711dd15cc@linux.intel.com>
Date: Thu, 5 Dec 2024 13:47:33 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
cc: Hans de Goede <hdegoede@...hat.com>, 
    "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>, Armin Wolf <W_Armin@....de>
Subject: Re: [PATCH v9 15/22] ACPI: platform_profile: Only show profiles
 common for all handlers

On Sun, 1 Dec 2024, Mario Limonciello wrote:

> If multiple platform profile handlers have been registered, don't allow
> switching to profiles unique to only one handler.
> 
> Reviewed-by: Armin Wolf <W_Armin@....de>
> Tested-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Tested-by: Matthew Schwartz <matthew.schwartz@...ux.dev>
> Reviewed-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.

> ---
>  drivers/acpi/platform_profile.c | 52 ++++++++++++++++++++++++++-------
>  1 file changed, 42 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index bb0178e52ff6b..40826876006b5 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -195,22 +195,54 @@ static const struct class platform_profile_class = {
>  	.dev_groups = profile_groups,
>  };
>  
> +/**
> + * _aggregate_choices - Aggregate the available profile choices
> + * @dev: The device
> + * @data: The available profile choices
> + * Return: 0 on success, -errno on failure
> + */
> +static int _aggregate_choices(struct device *dev, void *data)
> +{
> +	struct platform_profile_handler *handler;
> +	unsigned long *aggregate = data;
> +
> +	lockdep_assert_held(&profile_lock);
> +	handler = dev_get_drvdata(dev);
> +	if (test_bit(PLATFORM_PROFILE_LAST, aggregate))
> +		bitmap_copy(aggregate, handler->choices, PLATFORM_PROFILE_LAST);
> +	else
> +		bitmap_and(aggregate, handler->choices, aggregate, PLATFORM_PROFILE_LAST);
> +
> +	return 0;
> +}
> +
> +/**
> + * platform_profile_choices_show - Show the available profile choices for legacy sysfs interface
> + * @dev: The device
> + * @attr: The attribute
> + * @buf: The buffer to write to
> + * Return: The number of bytes written
> + */
>  static ssize_t platform_profile_choices_show(struct device *dev,
> -					struct device_attribute *attr,
> -					char *buf)
> +					     struct device_attribute *attr,
> +					     char *buf)
>  {
> -	int len = 0;
> -	int i;
> +	unsigned long aggregate[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
> +	int err;
>  
> +	set_bit(PLATFORM_PROFILE_LAST, aggregate);
>  	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> -		if (!cur_profile)
> -			return -ENODEV;
> -		for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST)
> -			len += sysfs_emit_at(buf, len, len ? " %s": "%s", profile_names[i]);
> +		err = class_for_each_device(&platform_profile_class, NULL,
> +					    aggregate, _aggregate_choices);
> +		if (err)
> +			return err;
>  	}
> -	len += sysfs_emit_at(buf, len, "\n");
>  
> -	return len;
> +	/* no profile handler registered any more */
> +	if (bitmap_empty(aggregate, PLATFORM_PROFILE_LAST))
> +		return -EINVAL;
> +
> +	return _commmon_choices_show(aggregate, buf);
>  }
>  
>  static ssize_t platform_profile_show(struct device *dev,
>