When registering a platform profile handler create a class device
that will allow changing a single platform profile handler.
The class and sysfs group are no longer needed when the platform profile
core is a module and unloaded, so remove them at that time as well.
Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v6:
* Catch failures in ida_alloc
* Use 4th argument of device_create instead of dev_set_drvdata()
* Squash unregister patch
* Add module init callback
* Move class creation to module init
* Update visibility based on group presence
* Add back parent device
v5:
* Use ida instead of idr
* Use device_unregister instead of device_destroy()
* MKDEV (0, 0)
---
drivers/acpi/platform_profile.c | 88 ++++++++++++++++++++++++++++++--
include/linux/platform_profile.h | 2 +
2 files changed, 85 insertions(+), 5 deletions(-)
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 32affb75e782d..ef6af2c655524 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -5,6 +5,7 @@
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/init.h>
+#include <linux/kdev_t.h>
#include <linux/mutex.h>
#include <linux/platform_profile.h>
#include <linux/sysfs.h>
@@ -22,6 +23,12 @@ static const char * const profile_names[] = {
};
static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
+static DEFINE_IDA(platform_profile_ida);
+
+static const struct class platform_profile_class = {
+ .name = "platform-profile",
+};
+
static ssize_t platform_profile_choices_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -105,8 +112,25 @@ static struct attribute *platform_profile_attrs[] = {
NULL
};
+static int profile_class_registered(struct device *dev, const void *data)
+{
+ return 1;
+}
+
+static umode_t profile_class_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
+{
+ if (!class_find_device(&platform_profile_class, NULL, NULL, profile_class_registered))
+ return 0;
+ if (attr == &dev_attr_platform_profile_choices.attr)
+ return 0444;
+ if (attr == &dev_attr_platform_profile.attr)
+ return 0644;
+ return 0;
+}
+
static const struct attribute_group platform_profile_group = {
- .attrs = platform_profile_attrs
+ .attrs = platform_profile_attrs,
+ .is_visible = profile_class_is_visible,
};
void platform_profile_notify(struct platform_profile_handler *pprof)
@@ -123,6 +147,9 @@ int platform_profile_cycle(void)
enum platform_profile_option next;
int err;
+ if (!class_is_registered(&platform_profile_class))
+ return -ENODEV;
+
scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
if (!cur_profile)
return -ENODEV;
@@ -164,25 +191,76 @@ int platform_profile_register(struct platform_profile_handler *pprof)
if (cur_profile)
return -EEXIST;
- err = sysfs_create_group(acpi_kobj, &platform_profile_group);
- if (err)
- return err;
+ /* create class interface for individual handler */
+ pprof->minor = ida_alloc(&platform_profile_ida, GFP_KERNEL);
+ if (pprof->minor < 0)
+ return pprof->minor;
+ pprof->class_dev = device_create(&platform_profile_class, pprof->dev,
+ MKDEV(0, 0), pprof, "platform-profile-%d",
+ pprof->minor);
+ if (IS_ERR(pprof->class_dev)) {
+ err = PTR_ERR(pprof->class_dev);
+ goto cleanup_ida;
+ }
cur_profile = pprof;
+
+ err = sysfs_update_group(acpi_kobj, &platform_profile_group);
+ if (err)
+ goto cleanup_cur;
+
return 0;
+
+cleanup_cur:
+ cur_profile = NULL;
+ device_unregister(pprof->class_dev);
+
+cleanup_ida:
+ ida_free(&platform_profile_ida, pprof->minor);
+
+ return err;
}
EXPORT_SYMBOL_GPL(platform_profile_register);
int platform_profile_remove(struct platform_profile_handler *pprof)
{
+ int id;
guard(mutex)(&profile_lock);
- sysfs_remove_group(acpi_kobj, &platform_profile_group);
+ id = pprof->minor;
+ device_unregister(pprof->class_dev);
+ ida_free(&platform_profile_ida, id);
+
cur_profile = NULL;
+
+ sysfs_update_group(acpi_kobj, &platform_profile_group);
+
return 0;
}
EXPORT_SYMBOL_GPL(platform_profile_remove);
+static int __init platform_profile_init(void)
+{
+ int err;
+
+ err = class_register(&platform_profile_class);
+ if (err)
+ return err;
+
+ err = sysfs_create_group(acpi_kobj, &platform_profile_group);
+ if (err)
+ class_unregister(&platform_profile_class);
+
+ return err;
+}
+static void __exit platform_profile_exit(void)
+{
+ class_unregister(&platform_profile_class);
+ sysfs_remove_group(acpi_kobj, &platform_profile_group);
+}
+module_init(platform_profile_init);
+module_exit(platform_profile_exit);
+
MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
MODULE_DESCRIPTION("ACPI platform profile sysfs interface");
MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
index 8ec0b8da56db5..a888fd085c513 100644
--- a/include/linux/platform_profile.h
+++ b/include/linux/platform_profile.h
@@ -29,6 +29,8 @@ enum platform_profile_option {
struct platform_profile_handler {
const char *name;
struct device *dev;
+ struct device *class_dev;
+ int minor;
unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
int (*profile_get)(struct platform_profile_handler *pprof,
enum platform_profile_option *profile);
--
2.43.0Am 09.11.24 um 05:41 schrieb Mario Limonciello:
> When registering a platform profile handler create a class device
> that will allow changing a single platform profile handler.
>
> The class and sysfs group are no longer needed when the platform profile
> core is a module and unloaded, so remove them at that time as well.
>
> Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
> v6:
> * Catch failures in ida_alloc
> * Use 4th argument of device_create instead of dev_set_drvdata()
> * Squash unregister patch
> * Add module init callback
> * Move class creation to module init
> * Update visibility based on group presence
> * Add back parent device
> v5:
> * Use ida instead of idr
> * Use device_unregister instead of device_destroy()
> * MKDEV (0, 0)
> ---
> drivers/acpi/platform_profile.c | 88 ++++++++++++++++++++++++++++++--
> include/linux/platform_profile.h | 2 +
> 2 files changed, 85 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 32affb75e782d..ef6af2c655524 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -5,6 +5,7 @@
> #include <linux/acpi.h>
> #include <linux/bits.h>
> #include <linux/init.h>
> +#include <linux/kdev_t.h>
> #include <linux/mutex.h>
> #include <linux/platform_profile.h>
> #include <linux/sysfs.h>
> @@ -22,6 +23,12 @@ static const char * const profile_names[] = {
> };
> static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
>
> +static DEFINE_IDA(platform_profile_ida);
> +
> +static const struct class platform_profile_class = {
> + .name = "platform-profile",
> +};
> +
> static ssize_t platform_profile_choices_show(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -105,8 +112,25 @@ static struct attribute *platform_profile_attrs[] = {
> NULL
> };
>
> +static int profile_class_registered(struct device *dev, const void *data)
> +{
> + return 1;
> +}
> +
> +static umode_t profile_class_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
> +{
> + if (!class_find_device(&platform_profile_class, NULL, NULL, profile_class_registered))
> + return 0;
> + if (attr == &dev_attr_platform_profile_choices.attr)
> + return 0444;
> + if (attr == &dev_attr_platform_profile.attr)
> + return 0644;
> + return 0;
> +}
> +
> static const struct attribute_group platform_profile_group = {
> - .attrs = platform_profile_attrs
> + .attrs = platform_profile_attrs,
> + .is_visible = profile_class_is_visible,
> };
>
> void platform_profile_notify(struct platform_profile_handler *pprof)
> @@ -123,6 +147,9 @@ int platform_profile_cycle(void)
> enum platform_profile_option next;
> int err;
>
> + if (!class_is_registered(&platform_profile_class))
> + return -ENODEV;
This check is pointless since the platform profile class will always be registered during module initialization.
Please remove it.
> +
> scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> if (!cur_profile)
> return -ENODEV;
> @@ -164,25 +191,76 @@ int platform_profile_register(struct platform_profile_handler *pprof)
> if (cur_profile)
> return -EEXIST;
>
> - err = sysfs_create_group(acpi_kobj, &platform_profile_group);
> - if (err)
> - return err;
> + /* create class interface for individual handler */
> + pprof->minor = ida_alloc(&platform_profile_ida, GFP_KERNEL);
> + if (pprof->minor < 0)
> + return pprof->minor;
> + pprof->class_dev = device_create(&platform_profile_class, pprof->dev,
> + MKDEV(0, 0), pprof, "platform-profile-%d",
> + pprof->minor);
> + if (IS_ERR(pprof->class_dev)) {
> + err = PTR_ERR(pprof->class_dev);
> + goto cleanup_ida;
> + }
>
> cur_profile = pprof;
> +
> + err = sysfs_update_group(acpi_kobj, &platform_profile_group);
> + if (err)
> + goto cleanup_cur;
> +
> return 0;
> +
> +cleanup_cur:
> + cur_profile = NULL;
> + device_unregister(pprof->class_dev);
> +
> +cleanup_ida:
> + ida_free(&platform_profile_ida, pprof->minor);
> +
> + return err;
> }
> EXPORT_SYMBOL_GPL(platform_profile_register);
>
> int platform_profile_remove(struct platform_profile_handler *pprof)
> {
> + int id;
> guard(mutex)(&profile_lock);
>
> - sysfs_remove_group(acpi_kobj, &platform_profile_group);
> + id = pprof->minor;
> + device_unregister(pprof->class_dev);
> + ida_free(&platform_profile_ida, id);
> +
> cur_profile = NULL;
> +
> + sysfs_update_group(acpi_kobj, &platform_profile_group);
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(platform_profile_remove);
>
> +static int __init platform_profile_init(void)
> +{
> + int err;
> +
> + err = class_register(&platform_profile_class);
> + if (err)
> + return err;
> +
> + err = sysfs_create_group(acpi_kobj, &platform_profile_group);
> + if (err)
> + class_unregister(&platform_profile_class);
> +
> + return err;
> +}
Please use a blank line after function/struct/union/enum declarations.
Apart from those minor issues the patch looks quite nice, so with those issues being fixed:
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
> +static void __exit platform_profile_exit(void)
> +{
> + class_unregister(&platform_profile_class);
> + sysfs_remove_group(acpi_kobj, &platform_profile_group);
> +}
> +module_init(platform_profile_init);
> +module_exit(platform_profile_exit);
> +
> MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
> MODULE_DESCRIPTION("ACPI platform profile sysfs interface");
> MODULE_LICENSE("GPL");
> diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
> index 8ec0b8da56db5..a888fd085c513 100644
> --- a/include/linux/platform_profile.h
> +++ b/include/linux/platform_profile.h
> @@ -29,6 +29,8 @@ enum platform_profile_option {
> struct platform_profile_handler {
> const char *name;
> struct device *dev;
> + struct device *class_dev;
> + int minor;
> unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
> int (*profile_get)(struct platform_profile_handler *pprof,
> enum platform_profile_option *profile);
Am 17.11.24 um 20:11 schrieb Armin Wolf:
> Am 09.11.24 um 05:41 schrieb Mario Limonciello:
>
>> When registering a platform profile handler create a class device
>> that will allow changing a single platform profile handler.
>>
>> The class and sysfs group are no longer needed when the platform profile
>> core is a module and unloaded, so remove them at that time as well.
>>
>> Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
>> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
>> ---
>> v6:
>> * Catch failures in ida_alloc
>> * Use 4th argument of device_create instead of dev_set_drvdata()
>> * Squash unregister patch
>> * Add module init callback
>> * Move class creation to module init
>> * Update visibility based on group presence
>> * Add back parent device
>> v5:
>> * Use ida instead of idr
>> * Use device_unregister instead of device_destroy()
>> * MKDEV (0, 0)
>> ---
>> drivers/acpi/platform_profile.c | 88 ++++++++++++++++++++++++++++++--
>> include/linux/platform_profile.h | 2 +
>> 2 files changed, 85 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/acpi/platform_profile.c
>> b/drivers/acpi/platform_profile.c
>> index 32affb75e782d..ef6af2c655524 100644
>> --- a/drivers/acpi/platform_profile.c
>> +++ b/drivers/acpi/platform_profile.c
>> @@ -5,6 +5,7 @@
>> #include <linux/acpi.h>
>> #include <linux/bits.h>
>> #include <linux/init.h>
>> +#include <linux/kdev_t.h>
>> #include <linux/mutex.h>
>> #include <linux/platform_profile.h>
>> #include <linux/sysfs.h>
>> @@ -22,6 +23,12 @@ static const char * const profile_names[] = {
>> };
>> static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
>>
>> +static DEFINE_IDA(platform_profile_ida);
>> +
>> +static const struct class platform_profile_class = {
>> + .name = "platform-profile",
>> +};
>> +
>> static ssize_t platform_profile_choices_show(struct device *dev,
>> struct device_attribute *attr,
>> char *buf)
>> @@ -105,8 +112,25 @@ static struct attribute
>> *platform_profile_attrs[] = {
>> NULL
>> };
>>
>> +static int profile_class_registered(struct device *dev, const void
>> *data)
>> +{
>> + return 1;
>> +}
>> +
>> +static umode_t profile_class_is_visible(struct kobject *kobj, struct
>> attribute *attr, int idx)
>> +{
>> + if (!class_find_device(&platform_profile_class, NULL, NULL,
>> profile_class_registered))
>> + return 0;
>> + if (attr == &dev_attr_platform_profile_choices.attr)
>> + return 0444;
>> + if (attr == &dev_attr_platform_profile.attr)
>> + return 0644;
>> + return 0;
>> +}
>> +
>> static const struct attribute_group platform_profile_group = {
>> - .attrs = platform_profile_attrs
>> + .attrs = platform_profile_attrs,
>> + .is_visible = profile_class_is_visible,
>> };
>>
>> void platform_profile_notify(struct platform_profile_handler *pprof)
>> @@ -123,6 +147,9 @@ int platform_profile_cycle(void)
>> enum platform_profile_option next;
>> int err;
>>
>> + if (!class_is_registered(&platform_profile_class))
>> + return -ENODEV;
>
> This check is pointless since the platform profile class will always
> be registered during module initialization.
> Please remove it.
>
>> +
>> scoped_cond_guard(mutex_intr, return -ERESTARTSYS,
>> &profile_lock) {
>> if (!cur_profile)
>> return -ENODEV;
>> @@ -164,25 +191,76 @@ int platform_profile_register(struct
>> platform_profile_handler *pprof)
>> if (cur_profile)
>> return -EEXIST;
>>
>> - err = sysfs_create_group(acpi_kobj, &platform_profile_group);
>> - if (err)
>> - return err;
>> + /* create class interface for individual handler */
>> + pprof->minor = ida_alloc(&platform_profile_ida, GFP_KERNEL);
>> + if (pprof->minor < 0)
>> + return pprof->minor;
>> + pprof->class_dev = device_create(&platform_profile_class,
>> pprof->dev,
>> + MKDEV(0, 0), pprof, "platform-profile-%d",
>> + pprof->minor);
>> + if (IS_ERR(pprof->class_dev)) {
>> + err = PTR_ERR(pprof->class_dev);
>> + goto cleanup_ida;
>> + }
>>
>> cur_profile = pprof;
>> +
>> + err = sysfs_update_group(acpi_kobj, &platform_profile_group);
>> + if (err)
>> + goto cleanup_cur;
>> +
>> return 0;
>> +
>> +cleanup_cur:
>> + cur_profile = NULL;
>> + device_unregister(pprof->class_dev);
>> +
>> +cleanup_ida:
>> + ida_free(&platform_profile_ida, pprof->minor);
>> +
>> + return err;
>> }
>> EXPORT_SYMBOL_GPL(platform_profile_register);
>>
>> int platform_profile_remove(struct platform_profile_handler *pprof)
>> {
>> + int id;
>> guard(mutex)(&profile_lock);
>>
>> - sysfs_remove_group(acpi_kobj, &platform_profile_group);
>> + id = pprof->minor;
>> + device_unregister(pprof->class_dev);
>> + ida_free(&platform_profile_ida, id);
>> +
>> cur_profile = NULL;
>> +
>> + sysfs_update_group(acpi_kobj, &platform_profile_group);
>> +
>> return 0;
>> }
>> EXPORT_SYMBOL_GPL(platform_profile_remove);
>>
>> +static int __init platform_profile_init(void)
>> +{
>> + int err;
>> +
>> + err = class_register(&platform_profile_class);
>> + if (err)
>> + return err;
>> +
>> + err = sysfs_create_group(acpi_kobj, &platform_profile_group);
>> + if (err)
>> + class_unregister(&platform_profile_class);
>> +
>> + return err;
>> +}
>
> Please use a blank line after function/struct/union/enum declarations.
>
> Apart from those minor issues the patch looks quite nice, so with
> those issues being fixed:
>
> Reviewed-by: Armin Wolf <W_Armin@gmx.de>
>
>> +static void __exit platform_profile_exit(void)
>> +{
>> + class_unregister(&platform_profile_class);
>> + sysfs_remove_group(acpi_kobj, &platform_profile_group);
I just noticed that the legacy sysfs group needs to be removed before the class, otherwise
there might be a short time window during module exit where the legacy sysfs interface might
try to use the already unregistered class.
Thanks,
Armin Wolf
>> +}
>> +module_init(platform_profile_init);
>> +module_exit(platform_profile_exit);
>> +
>> MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
>> MODULE_DESCRIPTION("ACPI platform profile sysfs interface");
>> MODULE_LICENSE("GPL");
>> diff --git a/include/linux/platform_profile.h
>> b/include/linux/platform_profile.h
>> index 8ec0b8da56db5..a888fd085c513 100644
>> --- a/include/linux/platform_profile.h
>> +++ b/include/linux/platform_profile.h
>> @@ -29,6 +29,8 @@ enum platform_profile_option {
>> struct platform_profile_handler {
>> const char *name;
>> struct device *dev;
>> + struct device *class_dev;
>> + int minor;
>> unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
>> int (*profile_get)(struct platform_profile_handler *pprof,
>> enum platform_profile_option *profile);
>
© 2016 - 2026 Red Hat, Inc.