linux-kernel - [PATCH v3 18/22] ACPI: platform_profile: Make sure all profile handlers agree on profile

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Message-ID: <20241031040952.109057-19-mario.limonciello@amd.com>
Date: Wed, 30 Oct 2024 23:09:48 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: 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>,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v3 18/22] ACPI: platform_profile: Make sure all profile handlers agree on profile

If for any reason multiple profile handlers don't agree on the profile
report the custom profile to userspace.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 39 +++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 3128bd16615b6..5baac1f9a9c0e 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -51,6 +51,36 @@ static unsigned long platform_profile_get_choices(void)
 	return aggregate;
 }
 
+static int platform_profile_get_active(enum platform_profile_option *profile)
+{
+	struct platform_profile_handler *handler;
+	enum platform_profile_option active = PLATFORM_PROFILE_LAST;
+	enum platform_profile_option val;
+	int err;
+
+	lockdep_assert_held(&profile_lock);
+	list_for_each_entry(handler, &platform_profile_handler_list, list) {
+		err = handler->profile_get(handler, &val);
+		if (err) {
+			pr_err("Failed to get profile for handler %s\n", handler->name);
+			return err;
+		}
+
+		if (WARN_ON(val >= PLATFORM_PROFILE_LAST))
+			return -EINVAL;
+
+		if (active != val && active != PLATFORM_PROFILE_LAST) {
+			*profile = PLATFORM_PROFILE_CUSTOM;
+			return 0;
+		}
+		active = val;
+	}
+
+	*profile = active;
+
+	return 0;
+}
+
 static ssize_t platform_profile_choices_show(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
@@ -81,18 +111,13 @@ static ssize_t platform_profile_show(struct device *dev,
 	int err;
 
 	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
-		if (!cur_profile)
+		if (!platform_profile_is_registered())
 			return -ENODEV;
-
-		err = cur_profile->profile_get(cur_profile, &profile);
+		err = platform_profile_get_active(&profile);
 		if (err)
 			return err;
 	}
 
-	/* Check that profile is valid index */
-	if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
-		return -EIO;
-
 	return sysfs_emit(buf, "%s\n", profile_names[profile]);
 }
 
-- 
2.43.0