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Message-ID: <20080313180538.GC4620@cathedrallabs.org>
Date: Thu, 13 Mar 2008 14:05:39 -0400
From: Aristeu Rozanski <aris@...vo.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Subject: [RFC][PATCH] nmi watchdog: handle NMI_IO_APIC on nmi_watchdog
This patch includes code to handle NMI_IO_APIC enabling/disabling by
nmi_watchdog proc file.
Signed-off-by: Aristeu Rozanski <aris@...vo.org>
---
arch/x86/kernel/nmi_32.c | 25 +++++++++++++++++++++++++
arch/x86/kernel/nmi_64.c | 25 +++++++++++++++++++++++++
2 files changed, 50 insertions(+)
--- nmi.orig/arch/x86/kernel/nmi_64.c 2008-03-12 17:02:36.000000000 -0400
+++ nmi/arch/x86/kernel/nmi_64.c 2008-03-12 17:47:35.000000000 -0400
@@ -274,6 +274,8 @@ 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);
}
@@ -405,6 +407,24 @@ void restart_nmi(void)
#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, 0, 1);
+ touch_nmi_watchdog();
+}
+
+static void disable_ioapic_nmi_watchdog(void)
+{
+ on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
+}
+
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
{
unsigned char reason = get_nmi_reason();
@@ -442,6 +462,11 @@ int proc_nmi_enabled(struct ctl_table *t
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");
--- nmi.orig/arch/x86/kernel/nmi_32.c 2008-03-12 15:16:30.000000000 -0400
+++ nmi/arch/x86/kernel/nmi_32.c 2008-03-12 17:50:55.000000000 -0400
@@ -270,6 +270,8 @@ 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);
}
@@ -390,6 +392,24 @@ __kprobes int nmi_watchdog_tick(struct p
#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, 0, 1);
+ touch_nmi_watchdog();
+}
+
+static void disable_ioapic_nmi_watchdog(void)
+{
+ on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
+}
+
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
{
unsigned char reason = get_nmi_reason();
@@ -431,6 +451,11 @@ int proc_nmi_enabled(struct ctl_table *t
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");
--
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