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This file is created by reboot-mode framework and provides a user-readable interface to query available reboot-mode arguments. Reviewed-by: Bartosz Golaszewski Reviewed-by: Sebastian Reichel Signed-off-by: Shivendra Pratap --- .../testing/sysfs-class-reboot-mode-reboot_modes | 36 ++++++++++++++++++= ++++ 1 file changed, 36 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-reboot-mode-reboot_modes= b/Documentation/ABI/testing/sysfs-class-reboot-mode-reboot_modes new file mode 100644 index 0000000000000000000000000000000000000000..a16c54ab841bb4687d3844ac5dd= 4abf6b37326e1 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-reboot-mode-reboot_modes @@ -0,0 +1,36 @@ +What: /sys/class/reboot-mode//reboot_modes +Date: March 2026(TBD) +KernelVersion: TBD +Contact: linux-pm@vger.kernel.org + Description: + This interface exposes the reboot-mode arguments + registered with the reboot-mode framework. 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This limits userspace scripts, to rely on hardcoded assumptions about the available reboot-modes. Create a class 'reboot-mode' and a device under it. Use the name of the registering driver as device name. Expose a sysfs interface under this device to show available reboot mode arguments. This results in the creation of: /sys/class/reboot-mode//reboot_modes This read-only sysfs file will exposes the supported reboot mode arguments provided by the registering driver, enabling userspace to query the list of arguments. Signed-off-by: Shivendra Pratap Reviewed-by: Bartosz Golaszewski --- drivers/power/reset/reboot-mode.c | 151 ++++++++++++++++++++++++++++++++++= +++- 1 file changed, 148 insertions(+), 3 deletions(-) diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot= -mode.c index fba53f638da04655e756b5f8b7d2d666d1379535..7fdb788c8cc85f26bdd381e1cea= 7a936b052e8ab 100644 --- a/drivers/power/reset/reboot-mode.c +++ b/drivers/power/reset/reboot-mode.c @@ -4,12 +4,16 @@ */ =20 #include +#include #include #include +#include #include #include #include #include +#include +#include =20 #define PREFIX "mode-" =20 @@ -19,6 +23,54 @@ struct mode_info { struct list_head list; }; =20 +struct reboot_mode_sysfs_data { + struct device *reboot_mode_device; + struct list_head head; +}; + +static inline void reboot_mode_release_list(struct list_head *head) +{ + struct mode_info *info; + struct mode_info *next; + + list_for_each_entry_safe(info, next, head, list) { + list_del(&info->list); + kfree_const(info->mode); + kfree(info); + } +} + +static ssize_t reboot_modes_show(struct device *dev, struct device_attribu= te *attr, char *buf) +{ + struct reboot_mode_sysfs_data *priv; + struct mode_info *sysfs_info; + ssize_t size =3D 0; + + priv =3D dev_get_drvdata(dev); + if (!priv) + return -ENODATA; + + list_for_each_entry(sysfs_info, &priv->head, list) + size +=3D sysfs_emit_at(buf, size, "%s ", sysfs_info->mode); + + if (!size) + return -ENODATA; + + return size + sysfs_emit_at(buf, size - 1, "\n"); +} +static DEVICE_ATTR_RO(reboot_modes); + +static struct attribute *reboot_mode_attrs[] =3D { + &dev_attr_reboot_modes.attr, + NULL, +}; +ATTRIBUTE_GROUPS(reboot_mode); + +static const struct class reboot_mode_class =3D { + .name =3D "reboot-mode", + .dev_groups =3D reboot_mode_groups, +}; + static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboo= t, const char *cmd) { @@ -62,6 +114,52 @@ static int reboot_mode_notify(struct notifier_block *th= is, return NOTIFY_DONE; } =20 +static int reboot_mode_create_device(struct reboot_mode_driver *reboot) +{ + struct reboot_mode_sysfs_data *priv; + struct mode_info *sysfs_info; + struct mode_info *info; + int ret; + + priv =3D kzalloc_obj(*priv, GFP_KERNEL); + if (!priv) + return -ENOMEM; + + INIT_LIST_HEAD(&priv->head); + + list_for_each_entry(info, &reboot->head, list) { + sysfs_info =3D kzalloc_obj(*sysfs_info, GFP_KERNEL); + if (!sysfs_info) { + ret =3D -ENOMEM; + goto error; + } + + sysfs_info->mode =3D kstrdup_const(info->mode, GFP_KERNEL); + if (!sysfs_info->mode) { + kfree(sysfs_info); + ret =3D -ENOMEM; + goto error; + } + + list_add_tail(&sysfs_info->list, &priv->head); + } + + priv->reboot_mode_device =3D device_create(&reboot_mode_class, NULL, 0, + (void *)priv, reboot->dev->driver->name); + + if (IS_ERR(priv->reboot_mode_device)) { + ret =3D PTR_ERR(priv->reboot_mode_device); + goto error; + } + + return 0; + +error: + reboot_mode_release_list(&priv->head); + kfree(priv); + return ret; +} + /** * reboot_mode_register - register a reboot mode driver * @reboot: reboot mode driver @@ -113,16 +211,49 @@ int reboot_mode_register(struct reboot_mode_driver *r= eboot) reboot->reboot_notifier.notifier_call =3D reboot_mode_notify; register_reboot_notifier(&reboot->reboot_notifier); =20 + ret =3D reboot_mode_create_device(reboot); + if (ret) + goto error; + return 0; =20 error: - list_for_each_entry(info, &reboot->head, list) - kfree_const(info->mode); - + reboot_mode_unregister(reboot); return ret; } EXPORT_SYMBOL_GPL(reboot_mode_register); =20 +static int reboot_mode_match_by_name(struct device *dev, const void *data) +{ + const char *name =3D data; + + if (!dev || !data) + return 0; + + return dev_name(dev) && strcmp(dev_name(dev), name) =3D=3D 0; +} + +static inline void reboot_mode_unregister_device(struct reboot_mode_driver= *reboot) +{ + struct reboot_mode_sysfs_data *priv; + struct device *reboot_mode_device; + + reboot_mode_device =3D class_find_device(&reboot_mode_class, NULL, reboot= ->dev->driver->name, + reboot_mode_match_by_name); + + if (!reboot_mode_device) + return; + + priv =3D dev_get_drvdata(reboot_mode_device); + device_unregister(reboot_mode_device); + + if (!priv) + return; + + reboot_mode_release_list(&priv->head); + kfree(priv); +} + /** * reboot_mode_unregister - unregister a reboot mode driver * @reboot: reboot mode driver @@ -132,6 +263,7 @@ int reboot_mode_unregister(struct reboot_mode_driver *r= eboot) struct mode_info *info; =20 unregister_reboot_notifier(&reboot->reboot_notifier); + reboot_mode_unregister_device(reboot); =20 list_for_each_entry(info, &reboot->head, list) kfree_const(info->mode); @@ -199,6 +331,19 @@ void devm_reboot_mode_unregister(struct device *dev, } EXPORT_SYMBOL_GPL(devm_reboot_mode_unregister); =20 +static int __init reboot_mode_init(void) +{ + return class_register(&reboot_mode_class); +} + +static void __exit reboot_mode_exit(void) +{ + class_unregister(&reboot_mode_class); +} + +subsys_initcall(reboot_mode_init); +module_exit(reboot_mode_exit); + MODULE_AUTHOR("Andy Yan "); MODULE_DESCRIPTION("System reboot mode core library"); MODULE_LICENSE("GPL v2"); --=20 2.34.1