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Message-ID: <20241109044151.29804-16-mario.limonciello@amd.com>
Date: Fri, 8 Nov 2024 22:41:44 -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 v6 15/22] ACPI: platform_profile: Only show profiles common for all handlers
If multiple platform profile handlers have been registered, don't allow
switching to profiles unique to only one handler.
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,
--
2.43.0
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