linux-kernel - [PATCH v3 16/22] ACPI: platform_profile: Set profile for all registered handlers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241031040952.109057-17-mario.limonciello@amd.com>
Date: Wed, 30 Oct 2024 23:09:46 -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 16/22] ACPI: platform_profile: Set profile for all registered handlers

If multiple platform profile handlers have been registered then when
setting a profile verify that all profile handlers support the requested
profile and set it to each handler.

If this fails for any given handler, revert all profile handlers back to
balanced and log an error into the kernel ring buffer.

Tested-by: Matthew Schwartz <matthew.schwartz@...ux.dev>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 90cbc0de4d5bc..c2bb325ba531c 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -99,6 +99,8 @@ static ssize_t platform_profile_store(struct device *dev,
 			    struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
+	struct platform_profile_handler *handler;
+	unsigned long choices;
 	int err, i;
 
 	/* Scan for a matching profile */
@@ -107,16 +109,29 @@ static ssize_t platform_profile_store(struct device *dev,
 		return -EINVAL;
 
 	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
-		if (!cur_profile)
+		if (!platform_profile_is_registered())
 			return -ENODEV;
 
-		/* Check that platform supports this profile choice */
-		if (!test_bit(i, cur_profile->choices))
+		/* Check that all handlers support this profile choice */
+		choices = platform_profile_get_choices();
+		if (!test_bit(i, &choices))
 			return -EOPNOTSUPP;
 
-		err = cur_profile->profile_set(cur_profile, i);
-		if (err)
+		list_for_each_entry(handler, &platform_profile_handler_list, list) {
+			err = handler->profile_set(handler, i);
+			if (err) {
+				pr_err("Failed to set profile for handler %s\n", handler->name);
+				break;
+			}
+		}
+		if (err) {
+			list_for_each_entry_continue_reverse(handler, &platform_profile_handler_list, list) {
+				if (handler->profile_set(handler, PLATFORM_PROFILE_BALANCED))
+					pr_err("Failed to revert profile for handler %s\n",
+					       handler->name);
+			}
 			return err;
+		}
 	}
 
 	sysfs_notify(acpi_kobj, NULL, "platform_profile");
-- 
2.43.0