1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 *  HW NMI watchdog support
 4 *
 5 *  started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
 6 *
 7 *  Arch specific calls to support NMI watchdog
 8 *
 9 *  Bits copied from original nmi.c file
10 *
11 */
 
12#include <asm/apic.h>
13#include <asm/nmi.h>
14
15#include <linux/cpumask.h>
16#include <linux/kdebug.h>
17#include <linux/notifier.h>
18#include <linux/kprobes.h>
19#include <linux/nmi.h>
20#include <linux/init.h>
21#include <linux/delay.h>
22
 
 
23#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
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_cpumask_backtrace
31static void nmi_raise_cpu_backtrace(cpumask_t *mask)
32{
33	apic->send_IPI_mask(mask, NMI_VECTOR);
34}
35
36void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
37{
38	nmi_trigger_cpumask_backtrace(mask, exclude_self,
39				      nmi_raise_cpu_backtrace);
40}
41
42static int nmi_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(nmi_cpu_backtrace_handler);
50
51static int __init register_nmi_cpu_backtrace_handler(void)
52{
53	register_nmi_handler(NMI_LOCAL, nmi_cpu_backtrace_handler,
54				0, "arch_bt");
55	return 0;
56}
57early_initcall(register_nmi_cpu_backtrace_handler);
58#endif

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 *  HW NMI watchdog support
 4 *
 5 *  started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
 6 *
 7 *  Arch specific calls to support NMI watchdog
 8 *
 9 *  Bits copied from original nmi.c file
10 *
11 */
12#include <linux/thread_info.h>
13#include <asm/apic.h>
14#include <asm/nmi.h>
15
16#include <linux/cpumask.h>
17#include <linux/kdebug.h>
18#include <linux/notifier.h>
19#include <linux/kprobes.h>
20#include <linux/nmi.h>
21#include <linux/init.h>
22#include <linux/delay.h>
23
24#include "local.h"
25
26#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
27u64 hw_nmi_get_sample_period(int watchdog_thresh)
28{
29	return (u64)(cpu_khz) * 1000 * watchdog_thresh;
30}
31#endif
32
33#ifdef arch_trigger_cpumask_backtrace
34static void nmi_raise_cpu_backtrace(cpumask_t *mask)
35{
36	__apic_send_IPI_mask(mask, NMI_VECTOR);
37}
38
39void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu)
40{
41	nmi_trigger_cpumask_backtrace(mask, exclude_cpu,
42				      nmi_raise_cpu_backtrace);
43}
44
45static int nmi_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
46{
47	if (nmi_cpu_backtrace(regs))
48		return NMI_HANDLED;
49
50	return NMI_DONE;
51}
52NOKPROBE_SYMBOL(nmi_cpu_backtrace_handler);
53
54static int __init register_nmi_cpu_backtrace_handler(void)
55{
56	register_nmi_handler(NMI_LOCAL, nmi_cpu_backtrace_handler,
57				0, "arch_bt");
58	return 0;
59}
60early_initcall(register_nmi_cpu_backtrace_handler);
61#endif