1/* 2 * HW NMI watchdog support 3 * 4 * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. 5 * 6 * Arch specific calls to support NMI watchdog 7 * 8 * Bits copied from original nmi.c file 9 * 10 */ 11#include <asm/apic.h> 12#include <asm/nmi.h> 13 14#include <linux/cpumask.h> 15#include <linux/kdebug.h> 16#include <linux/notifier.h> 17#include <linux/kprobes.h> 18#include <linux/nmi.h> 19#include <linux/module.h> 20#include <linux/delay.h> 21#include <linux/seq_buf.h> 22 23#ifdef CONFIG_HARDLOCKUP_DETECTOR 24u64 hw_nmi_get_sample_period(int watchdog_thresh) 25{ 26 return (u64)(cpu_khz) * 1000 * watchdog_thresh; 27} 28#endif 29 30#ifdef arch_trigger_all_cpu_backtrace 31static void nmi_raise_cpu_backtrace(cpumask_t *mask) 32{ 33 apic->send_IPI_mask(mask, NMI_VECTOR); 34} 35 36void arch_trigger_all_cpu_backtrace(bool include_self) 37{ 38 nmi_trigger_all_cpu_backtrace(include_self, nmi_raise_cpu_backtrace); 39} 40 41static int 42arch_trigger_all_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs) 43{ 44 if (nmi_cpu_backtrace(regs)) 45 return NMI_HANDLED; 46 47 return NMI_DONE; 48} 49NOKPROBE_SYMBOL(arch_trigger_all_cpu_backtrace_handler); 50 51static int __init register_trigger_all_cpu_backtrace(void) 52{ 53 register_nmi_handler(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler, 54 0, "arch_bt"); 55 return 0; 56} 57early_initcall(register_trigger_all_cpu_backtrace); 58#endif 59