linux-kernel - Re: [PATCH v6 15/22] ACPI: platform_profile: Only show profiles common for all handlers

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Message-ID: <1db4d806-4c83-47d9-9d88-24f0c1d99506@gmx.de>
Date: Mon, 18 Nov 2024 20:46:46 +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 15/22] ACPI: platform_profile: Only show profiles
 common for all handlers

Am 09.11.24 um 05:41 schrieb Mario Limonciello:

> 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>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v5:
>   * adjust mutex use
> ---
>   drivers/acpi/platform_profile.c | 56 ++++++++++++++++++++++++---------
>   1 file changed, 42 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index c4d451782ff18..c4e2c75116988 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -206,26 +206,54 @@ 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) {
> -			if (len == 0)
> -				len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
> -			else
> -				len += sysfs_emit_at(buf, len, " %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,