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| author | D Scott Phillips <scott@os.amperecomputing.com> | 2023-06-26 17:29:39 -0700 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-08-04 17:35:33 +0100 |
| commit | 5cd474e57368f0957c343bb21e309cf82826b1ef (patch) | |
| tree | 28834fe5587b0a98790159e3824fcc6ae4eb43c0 /arch/arm64/kernel/sdei.c | |
| parent | b9d6012497400aa65ef0f2cc537ce7720615dea7 (diff) | |
| download | linux-stable-5cd474e57368f0957c343bb21e309cf82826b1ef.tar.gz linux-stable-5cd474e57368f0957c343bb21e309cf82826b1ef.tar.bz2 linux-stable-5cd474e57368f0957c343bb21e309cf82826b1ef.zip | |
arm64: sdei: abort running SDEI handlers during crash
Interrupts are blocked in SDEI context, per the SDEI spec: "The client
interrupts cannot preempt the event handler." If we crashed in the SDEI
handler-running context (as with ACPI's AGDI) then we need to clean up the
SDEI state before proceeding to the crash kernel so that the crash kernel
can have working interrupts.
Track the active SDEI handler per-cpu so that we can COMPLETE_AND_RESUME
the handler, discarding the interrupted context.
Fixes: f5df26961853 ("arm64: kernel: Add arch-specific SDEI entry code and CPU masking")
Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Cc: stable@vger.kernel.org
Reviewed-by: James Morse <james.morse@arm.com>
Tested-by: Mihai Carabas <mihai.carabas@oracle.com>
Link: https://lore.kernel.org/r/20230627002939.2758-1-scott@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/sdei.c')
| -rw-r--r-- | arch/arm64/kernel/sdei.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c index 830be01af32d..255d12f881c2 100644 --- a/arch/arm64/kernel/sdei.c +++ b/arch/arm64/kernel/sdei.c @@ -47,6 +47,9 @@ DEFINE_PER_CPU(unsigned long *, sdei_shadow_call_stack_normal_ptr); DEFINE_PER_CPU(unsigned long *, sdei_shadow_call_stack_critical_ptr); #endif +DEFINE_PER_CPU(struct sdei_registered_event *, sdei_active_normal_event); +DEFINE_PER_CPU(struct sdei_registered_event *, sdei_active_critical_event); + static void _free_sdei_stack(unsigned long * __percpu *ptr, int cpu) { unsigned long *p; |