diff mbox series

[v6,17/22] ACPI: platform_profile: Make sure all profile handlers agree on profile

Message ID 20241109044151.29804-18-mario.limonciello@amd.com (mailing list archive)
State Changes Requested, archived
Headers show
Series Add support for binding ACPI platform profile to multiple drivers | expand

Commit Message

Mario Limonciello Nov. 9, 2024, 4:41 a.m. UTC 
If for any reason multiple profile handlers don't agree on the profile
return the custom profile.

Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v6:
 * Fix logic error with PLATFORM_PROFILE_CUSTOM
v5:
 * Notify class profile of change to legacy interface
 * Don't show warning when writing custom string, document in last patch
   instead.
 * Adjust mutex use
---
 drivers/acpi/platform_profile.c | 120 ++++++++++++++++++++++++++------
 1 file changed, 97 insertions(+), 23 deletions(-)

Comments

Armin Wolf Nov. 18, 2024, 7:51 p.m. UTC | #1 
Am 09.11.24 um 05:41 schrieb Mario Limonciello:

> If for any reason multiple profile handlers don't agree on the profile
> return the custom profile.
>
> Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
> v6:
>   * Fix logic error with PLATFORM_PROFILE_CUSTOM
> v5:
>   * Notify class profile of change to legacy interface
>   * Don't show warning when writing custom string, document in last patch
>     instead.
>   * Adjust mutex use
> ---
>   drivers/acpi/platform_profile.c | 120 ++++++++++++++++++++++++++------
>   1 file changed, 97 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 089ac73b3ec97..2676f4a13689e 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -71,6 +71,22 @@ static int _store_class_profile(struct device *dev, void *data)
>   	return 0;
>   }
>
> +/**
> + * _notify_class_profile - Notify the class device of a profile change
> + * @dev: The class device
> + * @data: Unused
> + */
> +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
> @@ -257,51 +273,109 @@ 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;
> +}
> +

Please don't use multiple blank lines. With that fixed:

Reviewed-by: Armin Wolf <W_Armin@gmx.de>

> +
> +/**
> + * _store_and_notify - Atomically 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");
diff mbox series

Patch

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 089ac73b3ec97..2676f4a13689e 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -71,6 +71,22 @@  static int _store_class_profile(struct device *dev, void *data)
 	return 0;
 }
 
+/**
+ * _notify_class_profile - Notify the class device of a profile change
+ * @dev: The class device
+ * @data: Unused
+ */
+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
@@ -257,51 +273,109 @@  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 - Atomically 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");