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Wysocki" , Daniel Lezcano , Zhang Rui , Lukasz Luba , Oleksij Rempel , Pengutronix Kernel Team Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev, avaneesh.dwivedi@oss.qualcomm.com, Umang Chheda , Ulf Hansson , Sebastian Reichel , Faruque Ansari , Bradley Morgan , Daniel Lezcano X-Mailer: b4 0.14.3 X-Proofpoint-Reinject: loops=2 maxloops=12 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE5MDAzMCBTYWx0ZWRfX155jjdDgzGkb KG4N+Do/mCRt5RXI9tDlRt5E6mDk0ksH0T8wos1oPHL03KgyGCNJmMAw+MrH5mlKXHG61WFTsaZ DADo7il5FcuMm3WwxJNwg2jsBNv650Q= X-Proofpoint-GUID: 3hpdtiX-T8eEmBOfpupowOYgNUA_jk7b X-Authority-Analysis: v=2.4 cv=Bu8IUoX5 c=1 sm=1 tr=0 ts=6ad5c915 cx=c_pps a=Ou0eQOY4+eZoSc0qltEV5Q==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=pGLkceISAAAA:8 a=OuZLqq7tAAAA:8 a=EUspDBNiAAAA:8 a=0cSYWeX8DinV4I8qkw8A:9 a=QEXdDO2ut3YA:10 a=AKGiAy9iJ-JzxKVHQNES:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE5MDAzMCBTYWx0ZWRfX5Ig3/l96nBQ1 tsGDcOISDgayU3+0R3qvB7BJvvDF8SoqxtmQXxnPwq4Ufc+o37XCXKoT0AKo1KXK0oYr9d3z1h5 vvNxnrkX169vy3f8EqobBAoxNncntcIE4cTMYuMuvNPiCCfLFy/83FnIkjVfj6D2jQ01wDXNinu MTuGCEBsMXv9tbYJNymdmygO11M7U3CeCq/u5ggfDuVrghY/GzAGRCdkNXrFx1suEd9lLXir4t7 T9WjHj7qYH1cyXx48aRaw8F8JHtMCJQ85LUMU66SHWnIUu4Hcqla6caVP8ns8/Km2L+J0oycrsg zoQdhcBl6doM1Xi0FiO7d1uyBBceSo2E0N3gvqjCdebBt798TStLNiOAZyzx+nGq76pgr9ZQOA9 nnt/ZVb8NtPIos9dAzy/ZauIFbqzTl2QgbMoGCgserAbnF8XYN2//jVrDyaXBVVzFVsr4VNhW3C JwjmpFyRrQUZNQ9Hf1A== X-Proofpoint-ORIG-GUID: 3hpdtiX-T8eEmBOfpupowOYgNUA_jk7b X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-19_02,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610190030 psc_reason_to_str() returns human-readable labels that contain spaces (e.g. "over temperature"). Those are fine for logs but unusable as values in a space-separated sysfs list or as a write target. Extend the single reason descriptor table with a stable, space-free token next to the existing label, and add psc_reason_to_token() and psc_reason_from_token() so consumers can emit and parse reasons without inventing their own string table. Co-developed-by: Oleksij Rempel Signed-off-by: Oleksij Rempel Reviewed-by: Matti Vaittinen Reviewed-by: Bradley Morgan Reviewed-by: Daniel Lezcano Signed-off-by: Faruque Ansari changes v16: - Add Reviewed-by tag from Bradley Morgan. - Add Reviewed-by tag from Daniel Lezcano. changes v15: - Add Reviewed-by tags from Matti Vaittinen. changes v12: - new patch --- include/linux/reboot.h | 2 ++ kernel/reboot.c | 77 +++++++++++++++++++++++++++++++++++++++----------- 2 files changed, 63 insertions(+), 16 deletions(-) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 190b5838fda1..b0fac2258413 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -244,6 +244,8 @@ enum psc_reason { }; const char *psc_reason_to_str(enum psc_reason reason); +const char *psc_reason_to_token(enum psc_reason reason); +int psc_reason_from_token(const char *token, enum psc_reason *reason); /** * enum hw_protection_action - Hardware protection action diff --git a/kernel/reboot.c b/kernel/reboot.c index c3552653a881..f153b6349369 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -1084,34 +1084,79 @@ void set_psc_reason(enum psc_reason reason) } EXPORT_SYMBOL_GPL(set_psc_reason); -static const char * const pscr_reason_strs[] = { - [PSCR_UNKNOWN] = POWER_ON_REASON_UNKNOWN, - [PSCR_UNDER_VOLTAGE] = POWER_ON_REASON_BROWN_OUT, - [PSCR_OVER_CURRENT] = POWER_ON_REASON_OVER_CURRENT, - [PSCR_REGULATOR_FAILURE] = POWER_ON_REASON_REGULATOR_FAILURE, - [PSCR_OVER_TEMPERATURE] = POWER_ON_REASON_OVER_TEMPERATURE, - [PSCR_EC_PANIC] = POWER_ON_REASON_EC_PANIC, +/** + * struct psc_reason_desc - Descriptor for a power state change reason. + * @token: Stable, parsable identifier without spaces (e.g. "over-temperature"). + * Suitable for use in sysfs values and as a user/kernel contract. + * @label: Human-readable description (e.g. "over temperature"), for logs. + */ +struct psc_reason_desc { + const char *token; + const char *label; +}; + +static const struct psc_reason_desc psc_reason_descs[] = { + [PSCR_UNKNOWN] = { "unknown", POWER_ON_REASON_UNKNOWN }, + [PSCR_UNDER_VOLTAGE] = { "under-voltage", POWER_ON_REASON_BROWN_OUT }, + [PSCR_OVER_CURRENT] = { "over-current", POWER_ON_REASON_OVER_CURRENT }, + [PSCR_REGULATOR_FAILURE] = { "regulator-failure", POWER_ON_REASON_REGULATOR_FAILURE }, + [PSCR_OVER_TEMPERATURE] = { "over-temperature", POWER_ON_REASON_OVER_TEMPERATURE }, + [PSCR_EC_PANIC] = { "ec-panic", POWER_ON_REASON_EC_PANIC }, }; /** - * psc_reason_to_str - Converts a power state change reason enum to a string. - * @reason: The `psc_reason` enum value to be converted. - * - * This function provides a human-readable string representation of the power - * state change reason, making it easier to interpret logs and debug messages. + * psc_reason_to_str - Human-readable label for a power state change reason. + * @reason: The `psc_reason` value to convert. * - * Return: - * - A string corresponding to the given `psc_reason` value. - * - `"Invalid reason"` if the value is not recognized. + * Return: The label string, or "Invalid reason" if @reason is out of range. + * For a stable, parsable form use psc_reason_to_token() instead. */ const char *psc_reason_to_str(enum psc_reason reason) { if (reason < 0 || reason >= PSCR_REASON_COUNT) return "Invalid reason"; - return pscr_reason_strs[reason]; + return psc_reason_descs[reason].label; } EXPORT_SYMBOL_GPL(psc_reason_to_str); +/** + * psc_reason_to_token - Stable, parsable token for a power state change reason. + * @reason: The `psc_reason` value to convert. + * + * Return: The token string (no spaces), or "invalid" if @reason is out of + * range. Round-trips with psc_reason_from_token(). + */ +const char *psc_reason_to_token(enum psc_reason reason) +{ + if (reason < 0 || reason >= PSCR_REASON_COUNT) + return "invalid"; + return psc_reason_descs[reason].token; +} +EXPORT_SYMBOL_GPL(psc_reason_to_token); + +/** + * psc_reason_from_token - Parse a reason token into a `psc_reason` value. + * @token: A token as returned by psc_reason_to_token(). A trailing newline is + * tolerated. + * @reason: Output; set on success. + * + * Return: 0 on success or -EINVAL if @token matches no known reason. + */ +int psc_reason_from_token(const char *token, enum psc_reason *reason) +{ + int i; + + for (i = 0; i < PSCR_REASON_COUNT; i++) { + if (sysfs_streq(token, psc_reason_descs[i].token)) { + *reason = i; + return 0; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(psc_reason_from_token); + /** * __hw_protection_trigger - Trigger an emergency system shutdown or reboot * -- 2.34.1