| /* | |
| * HW NMI watchdog support | |
| * | |
| * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. | |
| * | |
| * Arch specific calls to support NMI watchdog | |
| * | |
| * Bits copied from original nmi.c file | |
| * | |
| */ | |
| #include <asm/apic.h> | |
| #include <asm/nmi.h> | |
| #include <linux/cpumask.h> | |
| #include <linux/kdebug.h> | |
| #include <linux/notifier.h> | |
| #include <linux/kprobes.h> | |
| #include <linux/nmi.h> | |
| #include <linux/init.h> | |
| #include <linux/delay.h> | |
| #ifdef CONFIG_HARDLOCKUP_DETECTOR | |
| u64 hw_nmi_get_sample_period(int watchdog_thresh) | |
| { | |
| return (u64)(cpu_khz) * 1000 * watchdog_thresh; | |
| } | |
| #endif | |
| #ifdef arch_trigger_cpumask_backtrace | |
| static void nmi_raise_cpu_backtrace(cpumask_t *mask) | |
| { | |
| apic->send_IPI_mask(mask, NMI_VECTOR); | |
| } | |
| void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) | |
| { | |
| nmi_trigger_cpumask_backtrace(mask, exclude_self, | |
| nmi_raise_cpu_backtrace); | |
| } | |
| static int nmi_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs) | |
| { | |
| if (nmi_cpu_backtrace(regs)) | |
| return NMI_HANDLED; | |
| return NMI_DONE; | |
| } | |
| NOKPROBE_SYMBOL(nmi_cpu_backtrace_handler); | |
| static int __init register_nmi_cpu_backtrace_handler(void) | |
| { | |
| register_nmi_handler(NMI_LOCAL, nmi_cpu_backtrace_handler, | |
| 0, "arch_bt"); | |
| return 0; | |
| } | |
| early_initcall(register_nmi_cpu_backtrace_handler); | |
| #endif |