1 files changed, 107 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
new file mode 100644
index 000000000000..cefd6942f0e9
--- /dev/null
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -0,0 +1,107 @@
+/*
+ *  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 <linux/cpumask.h>
+#include <linux/kdebug.h>
+#include <linux/notifier.h>
+#include <linux/kprobes.h>
+#include <linux/nmi.h>
+#include <linux/module.h>
+
+/* For reliability, we're prepared to waste bits here. */
+static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
+
+u64 hw_nmi_get_sample_period(void)
+{
+        return (u64)(cpu_khz) * 1000 * 60;
+}
+
+#ifdef ARCH_HAS_NMI_WATCHDOG
+void arch_trigger_all_cpu_backtrace(void)
+{
+        int i;
+
+        cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
+
+        printk(KERN_INFO "sending NMI to all CPUs:\n");
+        apic->send_IPI_all(NMI_VECTOR);
+
+        /* Wait for up to 10 seconds for all CPUs to do the backtrace */
+        for (i = 0; i < 10 * 1000; i++) {
+                if (cpumask_empty(to_cpumask(backtrace_mask)))
+                        break;
+                mdelay(1);
+        }
+}
+
+static int __kprobes
+arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,
+                         unsigned long cmd, void *__args)
+{
+        struct die_args *args = __args;
+        struct pt_regs *regs;
+        int cpu = smp_processor_id();
+
+        switch (cmd) {
+        case DIE_NMI:
+        case DIE_NMI_IPI:
+                break;
+
+        default:
+                return NOTIFY_DONE;
+        }
+
+        regs = args->regs;
+
+        if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
+                static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
+
+                arch_spin_lock(&lock);
+                printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
+                show_regs(regs);
+                dump_stack();
+                arch_spin_unlock(&lock);
+                cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
+                return NOTIFY_STOP;
+        }
+
+        return NOTIFY_DONE;
+}
+
+static __read_mostly struct notifier_block backtrace_notifier = {
+        .notifier_call          = arch_trigger_all_cpu_backtrace_handler,
+        .next                   = NULL,
+        .priority               = 1
+};
+
+static int __init register_trigger_all_cpu_backtrace(void)
+{
+        register_die_notifier(&backtrace_notifier);
+        return 0;
+}
+early_initcall(register_trigger_all_cpu_backtrace);
+#endif
+
+/* STUB calls to mimic old nmi_watchdog behaviour */
+#if defined(CONFIG_X86_LOCAL_APIC)
+unsigned int nmi_watchdog = NMI_NONE;
+EXPORT_SYMBOL(nmi_watchdog);
+void acpi_nmi_enable(void) { return; }
+void acpi_nmi_disable(void) { return; }
+#endif
+atomic_t nmi_active = ATOMIC_INIT(0);           /* oprofile uses this */
+EXPORT_SYMBOL(nmi_active);
+int unknown_nmi_panic;
+void cpu_nmi_set_wd_enabled(void) { return; }
+void stop_apic_nmi_watchdog(void *unused) { return; }
+void setup_apic_nmi_watchdog(void *unused) { return; }
+int __init check_nmi_watchdog(void) { return 0; }