diff options
| author | Jay Buddhabhatti <jay.buddhabhatti@amd.com> | 2026-07-29 05:25:22 -0700 |
|---|---|---|
| committer | Michal Simek <michal.simek@amd.com> | 2026-08-10 09:30:44 +0200 |
| commit | 0e8860367da261116cd290bcd6a54d2e597a0c5c (patch) | |
| tree | f3ecf5e54a9877d433b7b0e7eaa6dbe8ed10ff4a /include/linux | |
| parent | 84dbfa5519cf6583d09ee0123ac580542b144553 (diff) | |
firmware: xilinx: Clear firmware notifiers across kexec transitions
During a kexec restart, only the kernel is reloaded but notifier callbacks
in firmware persist, causing state mismatches between kernel and firmware.
To address this, introduce PM_ALL_NOTIFIERS node ID to unregister all
notifier callbacks during kexec. On a graceful kexec restart, this occurs
in zynqmp_firmware_shutdown(). On a crash kernel restart, it happens in
zynqmp_firmware_probe() in the reloaded kernel.
Unregistering all notifiers depends on firmware support for the
PM_ALL_NOTIFIERS node ID. On firmware that does not implement it (the
feature check reports a version below PM_API_VERSION_3) the step is
skipped and a warning such as "Firmware doesn't support unregister all
notifiers at once" is logged, e.g. on Versal NET firmware that predates
this API.
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Reviewed-by: Prasanna Kumar T S M <ptsm@linux.microsoft.com>
Link: https://patch.msgid.link/20260729122522.3732875-4-jay.buddhabhatti@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/firmware/xlnx-zynqmp.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index ac39e5492961..69a2f74269f3 100644 --- a/include/linux/firmware/xlnx-zynqmp.h +++ b/include/linux/firmware/xlnx-zynqmp.h @@ -149,6 +149,9 @@ /* Node ID for all peripheral devices */ #define PM_DEV_ALL_PERIPH 0x18224FFFU +/* Node ID for all notifier callbacks */ +#define PM_ALL_NOTIFIERS 0xFFFFFFFFU + enum pm_module_id { PM_MODULE_ID = 0x0, XPM_MODULE_ID = 0x2, |