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Wysocki" , Zhang Rui , Lukasz Luba , =?utf-8?q?S=C3=B8ren_Andersen?= , Guenter Roeck , Matti Vaittinen , Ahmad Fatoum , Andrew Morton , avaneesh.dwivedi@oss.qualcomm.com, Umang Chheda , Faruque Ansari X-Mailer: b4 0.14.3 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Spam-Info: AW1haW4tMjYwODA0MDA3MyBTYWx0ZWRfX2+YhBEsMeUv4 yOuQF1gRAXw4llWs4CHAJyRIEFtTk9svQGn751yGUplGITcKS0U8oGKZkPoI9aZ37vRN5m1iBhG aZCRXCsye1Hga7NIML6P9V/ZSche/dQ= X-Proofpoint-GUID: LtQwJli2caWtWwJ2o_Newzz9XfUuc6A6 X-Proofpoint-ORIG-GUID: LtQwJli2caWtWwJ2o_Newzz9XfUuc6A6 X-Authority-Analysis: v=2.4 cv=EoniaycA c=1 sm=1 tr=0 ts=6a71af23 cx=c_pps a=Ou0eQOY4+eZoSc0qltEV5Q==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=opvmgqTE--nunqmWsLMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA0MDA3MyBTYWx0ZWRfX1nX39WRrnRwv SYmp7r54mOPnzKYpC3SQssPHXN4QKabV6tk6HrSJVoKQNbiqYcijN1qR3V6qdwtAowUDngtrzqS vWcQAWdek7wOtpf6OPgVHZYf4PmK2RLrB2lA/gVmlvuwKrVuibKHn6UPqnZzxqg4h739ep+zZMU 0JJMaO9r8GbL/75xBfyDgiAPSPNDLA+9hNYRCNRP3KohRniwSVJ9IGHn0hZwN8WNein78vYeab4 l9mrx/m6yGjZNfjJpiy4qg1YzoMRFwjrsviK4OJvUSF5Ld3oKnDZc80Jiaw5hhKbgmkhsQbV/wF jMMvlqY+HPSYSl6xOI4xEMwgYTjTs8bEN1zbghV1nw4SnAq/rtAGKc3b2rqVeWX6GNt5jZMpWkX Fz0177bsmBm2Dwb+B8J2QkSkDu8FZ0P8nk0wpH+wQGBO/OLMPc8EG6wtWA7FakgzFFO1X96eB3+ E0fAXxpyCbmzmGoVkMA== 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=2026-08-04_02,2026-08-03_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 phishscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 suspectscore=0 spamscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608040073 Kernel panic resets are not recorded in NVMEM, causing subsequent boots to report PSCR_UNKNOWN and making post-mortem analysis more difficult. Register a panic notifier to preserve the shutdown reason across panic-triggered resets. Add PSCR_KERNEL_PANIC as a dedicated reset reason code and its corresponding reason string to identify kernel panic resets on subsequent boots. Signed-off-by: Faruque Ansari --- drivers/power/reset/pscrr/pscrr.c | 27 +++++++++++++++++++++++++++ include/linux/power/power_on_reason.h | 1 + include/linux/reboot.h | 3 +++ kernel/reboot.c | 1 + 4 files changed, 32 insertions(+) diff --git a/drivers/power/reset/pscrr/pscrr.c b/drivers/power/reset/pscrr/pscrr.c index 6f23f4c4f590..8c45b84059a9 100644 --- a/drivers/power/reset/pscrr/pscrr.c +++ b/drivers/power/reset/pscrr/pscrr.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include #include @@ -519,6 +520,29 @@ static struct notifier_block pscrr_reboot_nb = { .notifier_call = pscrr_reboot_notifier, }; +/* + * Panic notifier: record that the machine went down through a kernel panic, so + * the cause is visible on the next boot. Runs in atomic panic context, so the + * provider list is walked without pscrr_lock - providers no longer come or go + * once the machine is going down. + */ +static int pscrr_panic_notifier(struct notifier_block *nb, + unsigned long action, void *unused) +{ + struct pscrr_provider_dir *dir; + + set_psc_reason(PSCR_KERNEL_PANIC); + + list_for_each_entry(dir, &pscrr_dirs, node) + pscrr_do_record(dir, get_psc_reason()); + + return NOTIFY_DONE; +} + +static struct notifier_block pscrr_panic_nb = { + .notifier_call = pscrr_panic_notifier, +}; + /*----------------------------------------------------------------------*/ /* Built-in provider: device-tree /chosen/reset-source */ /*----------------------------------------------------------------------*/ @@ -611,6 +635,8 @@ static int __init pscrr_core_init(void) return ret; } + atomic_notifier_chain_register(&panic_notifier_list, &pscrr_panic_nb); + pscrr_register_reset_source(); return 0; @@ -619,6 +645,7 @@ static int __init pscrr_core_init(void) static void __exit pscrr_core_exit(void) { pscrr_provider_unregister(&pscrr_reset_source_provider); + atomic_notifier_chain_unregister(&panic_notifier_list, &pscrr_panic_nb); unregister_reboot_notifier(&pscrr_reboot_nb); kobject_put(pscrr_root); pscrr_root = NULL; diff --git a/include/linux/power/power_on_reason.h b/include/linux/power/power_on_reason.h index 13e61ace14f5..8c99bdd75021 100644 --- a/include/linux/power/power_on_reason.h +++ b/include/linux/power/power_on_reason.h @@ -20,5 +20,6 @@ #define POWER_ON_REASON_OVER_TEMPERATURE "over temperature" #define POWER_ON_REASON_EC_PANIC "EC panic" #define POWER_ON_REASON_EXTERNAL "external reset" +#define POWER_ON_REASON_KERNEL_PANIC "kernel panic" #endif /* POWER_ON_REASON_H */ diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 13f004ad1066..a117dd5eaecd 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -241,6 +241,8 @@ extern void orderly_reboot(void); * * @PSCR_XTAL_FAIL: Reset caused by a crystal oscillator failure. * + * @PSCR_KERNEL_PANIC: Reset that followed a kernel panic. + * * @PSCR_REASON_COUNT: Number of defined power state change reasons. This * value is useful for range checking and potential future extensions * while maintaining compatibility. @@ -264,6 +266,7 @@ enum psc_reason { PSCR_RESET_BUTTON, PSCR_CPU_CLK_FAIL, PSCR_XTAL_FAIL, + PSCR_KERNEL_PANIC, /* Number of reasons */ PSCR_REASON_COUNT, diff --git a/kernel/reboot.c b/kernel/reboot.c index 75af5d763465..979ecf3b093c 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -1109,6 +1109,7 @@ static const struct psc_reason_desc psc_reason_descs[] = { [PSCR_RESET_BUTTON] = { "reset-button", POWER_ON_REASON_RST_BTN }, [PSCR_CPU_CLK_FAIL] = { "cpu-clock-failure", POWER_ON_REASON_CPU_CLK_FAIL }, [PSCR_XTAL_FAIL] = { "crystal-failure", POWER_ON_REASON_XTAL_FAIL }, + [PSCR_KERNEL_PANIC] = { "kernel-panic", POWER_ON_REASON_KERNEL_PANIC }, }; /** -- 2.34.1