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 <cernekee@xxxxxxxxx>
---
V2:
Use a raw notifier instead of a function pointer for NMI events.
arch/mips/include/asm/traps.h | 12 ++++++++++++
arch/mips/kernel/traps.c | 9 +++++++++
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/arch/mips/include/asm/traps.h b/arch/mips/include/asm/traps.h
index 90ff2f4..4edab87 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 5c8a49d..33945aa 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);
--
1.7.6.3
