linux-kernel - [PATCH v4 11/20] ACPI: platform_profile: Add choices attribute for class interface

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: <20241105153316.378-12-mario.limonciello@amd.com>
Date: Tue, 5 Nov 2024 09:33:07 -0600
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 v4 11/20] ACPI: platform_profile: Add choices attribute for class interface

The `choices` file will show all possible choices that a given platform
profile handler can support.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 63 +++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 986bd636be226..e1b6569c4ee70 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -25,6 +25,47 @@ static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
 
 static DEFINE_IDR(platform_profile_minor_idr);
 
+/**
+ * _commmon_choices_show - Show the available profile choices
+ * @choices: The available profile choices
+ * @buf: The buffer to write to
+ * Return: The number of bytes written
+ */
+static ssize_t _commmon_choices_show(unsigned long choices, char *buf)
+{
+	int i, len = 0;
+
+	for_each_set_bit(i, &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]);
+	}
+	len += sysfs_emit_at(buf, len, "\n");
+
+	return len;
+}
+
+/**
+ * _get_class_choices - Get the available profile choices for a class device
+ * @dev: The class device
+ * Return: The available profile choices
+ */
+static int _get_class_choices(struct device *dev, unsigned long *choices)
+{
+	struct platform_profile_handler *handler;
+	int i;
+
+	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
+		handler = dev_get_drvdata(dev);
+		for_each_set_bit(i, handler->choices, PLATFORM_PROFILE_LAST)
+			*choices |= BIT(i);
+	}
+
+	return 0;
+}
+
+
 /**
  * name_show - Show the name of the profile handler
  * @dev: The device
@@ -41,10 +82,32 @@ static ssize_t name_show(struct device *dev,
 	return sysfs_emit(buf, "%s\n", handler->name);
 }
 
+/**
+ * choices_show - Show the available profile choices
+ * @dev: The device
+ * @attr: The attribute
+ * @buf: The buffer to write to
+ */
+static ssize_t choices_show(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	unsigned long choices = 0;
+	int err;
+
+	err = _get_class_choices(dev, &choices);
+	if (err)
+		return err;
+
+	return _commmon_choices_show(choices, buf);
+}
+
 
 static DEVICE_ATTR_RO(name);
+static DEVICE_ATTR_RO(choices);
 static struct attribute *profile_attrs[] = {
 	&dev_attr_name.attr,
+	&dev_attr_choices.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(profile);
-- 
2.43.0