| Message ID | 20241202055031.8038-18-mario.limonciello@amd.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add support for binding ACPI platform profile to multiple drivers | expand |
On Sun, 1 Dec 2024, Mario Limonciello wrote: > 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> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> > --- > drivers/acpi/platform_profile.c | 119 ++++++++++++++++++++++++++------ > 1 file changed, 96 insertions(+), 23 deletions(-) > > diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c > index a9cd13c5fd39b..d5f0679d59d50 100644 > --- a/drivers/acpi/platform_profile.c > +++ b/drivers/acpi/platform_profile.c > @@ -66,6 +66,22 @@ 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 > + */ > +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 > @@ -246,51 +262,108 @@ 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 Please leave an empty row after args (obviously with the * continuation). Check all kerneldocs in the series for this. > + * 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 I'm a bit unsure what "atomically" means in this context. If it relates to _store_class_profile() only, that function didn't use "atomically" in its kerneldoc. > + * @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"); > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c index a9cd13c5fd39b..d5f0679d59d50 100644 --- a/drivers/acpi/platform_profile.c +++ b/drivers/acpi/platform_profile.c @@ -66,6 +66,22 @@ 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 + */ +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 @@ -246,51 +262,108 @@ 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");