From 34bd92e27becdc2c8b50d200a329da5e9b8174d9 Mon Sep 17 00:00:00 2001 From: Kevin Cernekee Date: Wed, 16 Nov 2011 01:25:44 +0000 Subject: [PATCH] MIPS: Add NMI notifier Allow the board support code to register a raw notifier callback for NMI, similar to what is done for CU2 exceptions. Signed-off-by: Kevin Cernekee Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2958/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/traps.h | 12 ++++++++++++ arch/mips/kernel/traps.c | 9 +++++++++ 2 files changed, 21 insertions(+) diff --git a/arch/mips/include/asm/traps.h b/arch/mips/include/asm/traps.h index 90ff2f497c50..4edab87eebd2 100644 --- a/arch/mips/include/asm/traps.h +++ b/arch/mips/include/asm/traps.h @@ -25,4 +25,16 @@ extern void (*board_nmi_handler_setup)(void); extern void (*board_ejtag_handler_setup)(void); extern void (*board_bind_eic_interrupt)(int irq, int regset); +extern int register_nmi_notifier(struct notifier_block *nb); + +#define nmi_notifier(fn, pri) \ +({ \ + static struct notifier_block fn##_nb = { \ + .notifier_call = fn, \ + .priority = pri \ + }; \ + \ + register_nmi_notifier(&fn##_nb); \ +}) + #endif /* _ASM_TRAPS_H */ diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 5c8a49d55054..33945aaa9b1b 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1339,9 +1339,18 @@ void ejtag_exception_handler(struct pt_regs *regs) /* * NMI exception handler. + * No lock; only written during early bootup by CPU 0. */ +static RAW_NOTIFIER_HEAD(nmi_chain); + +int register_nmi_notifier(struct notifier_block *nb) +{ + return raw_notifier_chain_register(&nmi_chain, nb); +} + NORET_TYPE void ATTRIB_NORET nmi_exception_handler(struct pt_regs *regs) { + raw_notifier_call_chain(&nmi_chain, 0, regs); bust_spinlocks(1); printk("NMI taken!!!!\n"); die("NMI", regs); -- 2.34.1