1 files changed, 46 insertions, 12 deletions

diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 2c97f07f1c2c..8bd1bf9622a7 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -131,6 +131,11 @@ static void report_broken_nmi(int cpu, int *prev_nmi_count)
         atomic_dec(&nmi_active);
 }
 
+static void __acpi_nmi_disable(void *__unused)
+{
+        apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
+}
+
 int __init check_nmi_watchdog(void)
 {
         unsigned int *prev_nmi_count;
@@ -179,8 +184,12 @@ int __init check_nmi_watchdog(void)
         kfree(prev_nmi_count);
         return 0;
 error:
-        if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259)
-                disable_8259A_irq(0);
+        if (nmi_watchdog == NMI_IO_APIC) {
+                if (!timer_through_8259)
+                        disable_8259A_irq(0);
+                on_each_cpu(__acpi_nmi_disable, NULL, 1);
+        }
+
 #ifdef CONFIG_X86_32
         timer_ack = 0;
 #endif
@@ -199,12 +208,17 @@ static int __init setup_nmi_watchdog(char *str)
                 ++str;
         }
 
-        get_option(&str, &nmi);
-
-        if (nmi >= NMI_INVALID)
-                return 0;
+        if (!strncmp(str, "lapic", 5))
+                nmi_watchdog = NMI_LOCAL_APIC;
+        else if (!strncmp(str, "ioapic", 6))
+                nmi_watchdog = NMI_IO_APIC;
+        else {
+                get_option(&str, &nmi);
+                if (nmi >= NMI_INVALID)
+                        return 0;
+                nmi_watchdog = nmi;
+        }
 
-        nmi_watchdog = nmi;
         return 1;
 }
 __setup("nmi_watchdog=", setup_nmi_watchdog);
@@ -285,11 +299,6 @@ void acpi_nmi_enable(void)
                 on_each_cpu(__acpi_nmi_enable, NULL, 1);
 }
 
-static void __acpi_nmi_disable(void *__unused)
-{
-        apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
-}
-
 /*
  * Disable timer based NMIs on all CPUs:
  */
@@ -340,6 +349,8 @@ void stop_apic_nmi_watchdog(void *unused)
                 return;
         if (nmi_watchdog == NMI_LOCAL_APIC)
                 lapic_watchdog_stop();
+        else
+                __acpi_nmi_disable(NULL);
         __get_cpu_var(wd_enabled) = 0;
         atomic_dec(&nmi_active);
 }
@@ -465,6 +476,24 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
 
 #ifdef CONFIG_SYSCTL
 
+static void enable_ioapic_nmi_watchdog_single(void *unused)
+{
+        __get_cpu_var(wd_enabled) = 1;
+        atomic_inc(&nmi_active);
+        __acpi_nmi_enable(NULL);
+}
+
+static void enable_ioapic_nmi_watchdog(void)
+{
+        on_each_cpu(enable_ioapic_nmi_watchdog_single, NULL, 1);
+        touch_nmi_watchdog();
+}
+
+static void disable_ioapic_nmi_watchdog(void)
+{
+        on_each_cpu(stop_apic_nmi_watchdog, NULL, 1);
+}
+
 static int __init setup_unknown_nmi_panic(char *str)
 {
         unknown_nmi_panic = 1;
@@ -507,6 +536,11 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
                         enable_lapic_nmi_watchdog();
                 else
                         disable_lapic_nmi_watchdog();
+        } else if (nmi_watchdog == NMI_IO_APIC) {
+                if (nmi_watchdog_enabled)
+                        enable_ioapic_nmi_watchdog();
+                else
+                        disable_ioapic_nmi_watchdog();
         } else {
                 printk(KERN_WARNING
                         "NMI watchdog doesn't know what hardware to touch\n");