[PATCH v10 17/22] ACPI: platform_profile: Make sure all profile handlers agree on profile

Mario Limonciello
2024-12-06T03:26:18Z

If for any reason multiple profile handlers don't agree on the profile
return the custom profile.

Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v10:
* Whitespace
---
drivers/acpi/platform_profile.c | 125 ++++++++++++++++++++++++++------
1 file changed, 102 insertions(+), 23 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 54483269b8834..95aff045a1eb3 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -68,6 +68,24 @@ static int _store_class_profile(struct device *dev, void *data)
return handler->profile_set(handler, *bit);
}

+/**
+ * _notify_class_profile - Notify the class device of a profile change
+ * @dev: The class device
+ * @data: Unused
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int _notify_class_profile(struct device *dev, void *data)
+{
+ struct platform_profile_handler *handler = dev_get_drvdata(dev);
+
+ lockdep_assert_held(&profile_lock);
+ sysfs_notify(&handler->class_dev->kobj, NULL, "profile");
+ kobject_uevent(&handler->class_dev->kobj, KOBJ_CHANGE);
+
+ return 0;
+}
+
/**
* get_class_profile - Show the current profile for a class device
* @dev: The class device
@@ -251,51 +269,112 @@ static ssize_t platform_profile_choices_show(struct device *dev,
return _commmon_choices_show(aggregate, buf);
}

+/**
+ * _aggregate_profiles - Aggregate the profiles for legacy sysfs interface
+ * @dev: The device
+ * @data: The profile to return
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int _aggregate_profiles(struct device *dev, void *data)
+{
+ enum platform_profile_option *profile = data;
+ enum platform_profile_option val;
+ int err;
+
+ err = get_class_profile(dev, &val);
+ if (err)
+ return err;
+
+ if (*profile != PLATFORM_PROFILE_LAST && *profile != val)
+ *profile = PLATFORM_PROFILE_CUSTOM;
+ else
+ *profile = val;
+
+ return 0;
+}
+
+/**
+ * _store_and_notify - Store and notify a class from legacy sysfs interface
+ * @dev: The device
+ * @data: The profile to return
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int _store_and_notify(struct device *dev, void *data)
+{
+ enum platform_profile_option *profile = data;
+ int err;
+
+ err = _store_class_profile(dev, profile);
+ if (err)
+ return err;
+ return _notify_class_profile(dev, NULL);
+}
+
+/**
+ * platform_profile_show - Show the current profile 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_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+ struct device_attribute *attr,
+ char *buf)
{
- enum platform_profile_option profile = PLATFORM_PROFILE_BALANCED;
+ enum platform_profile_option profile = PLATFORM_PROFILE_LAST;
int err;

scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
- if (!cur_profile)
- return -ENODEV;
-
- err = cur_profile->profile_get(cur_profile, &profile);
+ err = class_for_each_device(&platform_profile_class, NULL,
+ &profile, _aggregate_profiles);
if (err)
return err;
}

- /* Check that profile is valid index */
- if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
- return -EIO;
+ /* no profile handler registered any more */
+ if (profile == PLATFORM_PROFILE_LAST)
+ return -EINVAL;

return sysfs_emit(buf, "%s\n", profile_names[profile]);
}

+/**
+ * platform_profile_store - Set the profile for legacy sysfs interface
+ * @dev: The device
+ * @attr: The attribute
+ * @buf: The buffer to read from
+ * @count: The number of bytes to read
+ *
+ * Return: The number of bytes read
+ */
static ssize_t platform_profile_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- int err, i;
+ unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
+ int ret;
+ int i;

/* Scan for a matching profile */
i = sysfs_match_string(profile_names, buf);
- if (i < 0)
+ if (i < 0 || i == PLATFORM_PROFILE_CUSTOM)
return -EINVAL;
-
+ set_bit(PLATFORM_PROFILE_LAST, choices);
scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
- if (!cur_profile)
- return -ENODEV;
-
- /* Check that platform supports this profile choice */
- if (!test_bit(i, cur_profile->choices))
+ ret = class_for_each_device(&platform_profile_class, NULL,
+ choices, _aggregate_choices);
+ if (ret)
+ return ret;
+ if (!test_bit(i, choices))
return -EOPNOTSUPP;

- err = cur_profile->profile_set(cur_profile, i);
- if (err)
- return err;
+ ret = class_for_each_device(&platform_profile_class, NULL, &i,
+ _store_and_notify);
+ if (ret)
+ return ret;
}

sysfs_notify(acpi_kobj, NULL, "platform_profile");
--
2.43.0