diff options
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 5031814ac94..12178162785 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -10,6 +10,7 @@ #include <linux/thread_info.h> #include <linux/capability.h> #include <linux/miscdevice.h> +#include <linux/interrupt.h> #include <linux/ratelimit.h> #include <linux/kallsyms.h> #include <linux/rcupdate.h> @@ -32,7 +33,10 @@ #include <linux/fs.h> #include <asm/processor.h> +#include <asm/hw_irq.h> +#include <asm/apic.h> #include <asm/idle.h> +#include <asm/ipi.h> #include <asm/mce.h> #include <asm/msr.h> @@ -287,6 +291,54 @@ static inline void mce_get_rip(struct mce *m, struct pt_regs *regs) } } +#ifdef CONFIG_X86_LOCAL_APIC +/* + * Called after interrupts have been reenabled again + * when a MCE happened during an interrupts off region + * in the kernel. + */ +asmlinkage void smp_mce_self_interrupt(struct pt_regs *regs) +{ + ack_APIC_irq(); + exit_idle(); + irq_enter(); + mce_notify_user(); + irq_exit(); +} +#endif + +static void mce_report_event(struct pt_regs *regs) +{ + if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) { + mce_notify_user(); + return; + } + +#ifdef CONFIG_X86_LOCAL_APIC + /* + * Without APIC do not notify. The event will be picked + * up eventually. + */ + if (!cpu_has_apic) + return; + + /* + * When interrupts are disabled we cannot use + * kernel services safely. Trigger an self interrupt + * through the APIC to instead do the notification + * after interrupts are reenabled again. + */ + apic->send_IPI_self(MCE_SELF_VECTOR); + + /* + * Wait for idle afterwards again so that we don't leave the + * APIC in a non idle state because the normal APIC writes + * cannot exclude us. + */ + apic_wait_icr_idle(); +#endif +} + DEFINE_PER_CPU(unsigned, mce_poll_count); /* @@ -530,6 +582,8 @@ void do_machine_check(struct pt_regs *regs, long error_code) /* notify userspace ASAP */ set_thread_flag(TIF_MCE_NOTIFY); + mce_report_event(regs); + /* the last thing we do is clear state */ for (i = 0; i < banks; i++) { if (test_bit(i, toclear)) |