6.4-stable review patch. If anyone has any objections, please let me know.
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From: D Scott Phillips scott@os.amperecomputing.com
commit 5cd474e57368f0957c343bb21e309cf82826b1ef upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/include/asm/sdei.h | 6 ++++++ arch/arm64/kernel/entry.S | 27 +++++++++++++++++++++++++-- arch/arm64/kernel/sdei.c | 3 +++ arch/arm64/kernel/smp.c | 8 ++++---- drivers/firmware/arm_sdei.c | 19 +++++++++++++++++++ include/linux/arm_sdei.h | 2 ++ 6 files changed, 59 insertions(+), 6 deletions(-)
--- a/arch/arm64/include/asm/sdei.h +++ b/arch/arm64/include/asm/sdei.h @@ -17,6 +17,9 @@
#include <asm/virt.h>
+DECLARE_PER_CPU(struct sdei_registered_event *, sdei_active_normal_event); +DECLARE_PER_CPU(struct sdei_registered_event *, sdei_active_critical_event); + extern unsigned long sdei_exit_mode;
/* Software Delegated Exception entry point from firmware*/ @@ -29,6 +32,9 @@ asmlinkage void __sdei_asm_entry_trampol unsigned long pc, unsigned long pstate);
+/* Abort a running handler. Context is discarded. */ +void __sdei_handler_abort(void); + /* * The above entry point does the minimum to call C code. This function does * anything else, before calling the driver. --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -1003,9 +1003,13 @@ SYM_CODE_START(__sdei_asm_handler)
mov x19, x1
-#if defined(CONFIG_VMAP_STACK) || defined(CONFIG_SHADOW_CALL_STACK) + /* Store the registered-event for crash_smp_send_stop() */ ldrb w4, [x19, #SDEI_EVENT_PRIORITY] -#endif + cbnz w4, 1f + adr_this_cpu dst=x5, sym=sdei_active_normal_event, tmp=x6 + b 2f +1: adr_this_cpu dst=x5, sym=sdei_active_critical_event, tmp=x6 +2: str x19, [x5]
#ifdef CONFIG_VMAP_STACK /* @@ -1072,6 +1076,14 @@ SYM_CODE_START(__sdei_asm_handler)
ldr_l x2, sdei_exit_mode
+ /* Clear the registered-event seen by crash_smp_send_stop() */ + ldrb w3, [x4, #SDEI_EVENT_PRIORITY] + cbnz w3, 1f + adr_this_cpu dst=x5, sym=sdei_active_normal_event, tmp=x6 + b 2f +1: adr_this_cpu dst=x5, sym=sdei_active_critical_event, tmp=x6 +2: str xzr, [x5] + alternative_if_not ARM64_UNMAP_KERNEL_AT_EL0 sdei_handler_exit exit_mode=x2 alternative_else_nop_endif @@ -1082,4 +1094,15 @@ alternative_else_nop_endif #endif SYM_CODE_END(__sdei_asm_handler) NOKPROBE(__sdei_asm_handler) + +SYM_CODE_START(__sdei_handler_abort) + mov_q x0, SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME + adr x1, 1f + ldr_l x2, sdei_exit_mode + sdei_handler_exit exit_mode=x2 + // exit the handler and jump to the next instruction. + // Exit will stomp x0-x17, PSTATE, ELR_ELx, and SPSR_ELx. +1: ret +SYM_CODE_END(__sdei_handler_abort) +NOKPROBE(__sdei_handler_abort) #endif /* CONFIG_ARM_SDE_INTERFACE */ --- a/arch/arm64/kernel/sdei.c +++ b/arch/arm64/kernel/sdei.c @@ -47,6 +47,9 @@ DEFINE_PER_CPU(unsigned long *, sdei_sha 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; --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -1048,10 +1048,8 @@ void crash_smp_send_stop(void) * If this cpu is the only one alive at this point in time, online or * not, there are no stop messages to be sent around, so just back out. */ - if (num_other_online_cpus() == 0) { - sdei_mask_local_cpu(); - return; - } + if (num_other_online_cpus() == 0) + goto skip_ipi;
cpumask_copy(&mask, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &mask); @@ -1070,7 +1068,9 @@ void crash_smp_send_stop(void) pr_warn("SMP: failed to stop secondary CPUs %*pbl\n", cpumask_pr_args(&mask));
+skip_ipi: sdei_mask_local_cpu(); + sdei_handler_abort(); }
bool smp_crash_stop_failed(void) --- a/drivers/firmware/arm_sdei.c +++ b/drivers/firmware/arm_sdei.c @@ -1095,3 +1095,22 @@ int sdei_event_handler(struct pt_regs *r return err; } NOKPROBE_SYMBOL(sdei_event_handler); + +void sdei_handler_abort(void) +{ + /* + * If the crash happened in an SDEI event handler then we need to + * finish the handler with the firmware so that we can have working + * interrupts in the crash kernel. + */ + if (__this_cpu_read(sdei_active_critical_event)) { + pr_warn("still in SDEI critical event context, attempting to finish handler.\n"); + __sdei_handler_abort(); + __this_cpu_write(sdei_active_critical_event, NULL); + } + if (__this_cpu_read(sdei_active_normal_event)) { + pr_warn("still in SDEI normal event context, attempting to finish handler.\n"); + __sdei_handler_abort(); + __this_cpu_write(sdei_active_normal_event, NULL); + } +} --- a/include/linux/arm_sdei.h +++ b/include/linux/arm_sdei.h @@ -47,10 +47,12 @@ int sdei_unregister_ghes(struct ghes *gh int sdei_mask_local_cpu(void); int sdei_unmask_local_cpu(void); void __init sdei_init(void); +void sdei_handler_abort(void); #else static inline int sdei_mask_local_cpu(void) { return 0; } static inline int sdei_unmask_local_cpu(void) { return 0; } static inline void sdei_init(void) { } +static inline void sdei_handler_abort(void) { } #endif /* CONFIG_ARM_SDE_INTERFACE */