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nmi_watchdog: Compile and portability fixes 

The original patch was x86_64 centric.  Changed the code to make
it less so.

ested by building and running on a powerpc.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: peterz@infradead.org
Cc: gorcunov@gmail.com
Cc: aris@redhat.com
LKML-Reference: <1266013161-31197-2-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Don Zickus 2010-02-12 17:19:19 -05:00 committed by Ingo Molnar
parent c3128fb6ad
commit 504d7cf10e
5 changed files with 84 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/nmi.h
View File

@ -17,7 +17,9 @@ int do_nmi_callback(struct pt_regs *regs, int cpu);
extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
extern int check_nmi_watchdog(void);
#if !defined(CONFIG_NMI_WATCHDOG)
extern int nmi_watchdog_enabled;
#endif
extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
extern int reserve_perfctr_nmi(unsigned int);
extern void release_perfctr_nmi(unsigned int);

25
arch/x86/kernel/apic/hw_nmi.c
View File

@ -32,8 +32,13 @@ static DEFINE_PER_CPU(unsigned, last_irq_sum);
*/
static inline unsigned int get_timer_irqs(int cpu)
{
return per_cpu(irq_stat, cpu).apic_timer_irqs +
per_cpu(irq_stat, cpu).irq0_irqs;
unsigned int irqs = per_cpu(irq_stat, cpu).irq0_irqs;
#if defined(CONFIG_X86_LOCAL_APIC)
irqs += per_cpu(irq_stat, cpu).apic_timer_irqs;
#endif
return irqs;
}
static inline int mce_in_progress(void)
@ -82,6 +87,11 @@ int hw_nmi_is_cpu_stuck(struct pt_regs *regs)
}
}
u64 hw_nmi_get_sample_period(void)
{
return cpu_khz * 1000;
}
void arch_trigger_all_cpu_backtrace(void)
{
int i;
@ -100,15 +110,16 @@ void arch_trigger_all_cpu_backtrace(void)
}
/* STUB calls to mimic old nmi_watchdog behaviour */
#if defined(CONFIG_X86_LOCAL_APIC)
unsigned int nmi_watchdog = NMI_NONE;
EXPORT_SYMBOL(nmi_watchdog);
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
EXPORT_SYMBOL(nmi_active);
int nmi_watchdog_enabled;
int unknown_nmi_panic;
void cpu_nmi_set_wd_enabled(void) { return; }
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; }

9
include/linux/nmi.h
View File

@ -20,10 +20,14 @@ extern void touch_nmi_watchdog(void);
extern void acpi_nmi_disable(void);
extern void acpi_nmi_enable(void);
#else
#ifndef CONFIG_NMI_WATCHDOG
static inline void touch_nmi_watchdog(void)
{
touch_softlockup_watchdog();
}
#else
extern void touch_nmi_watchdog(void);
#endif
static inline void acpi_nmi_disable(void) { }
static inline void acpi_nmi_enable(void) { }
#endif
@ -49,6 +53,11 @@ static inline bool trigger_all_cpu_backtrace(void)
#ifdef CONFIG_NMI_WATCHDOG
int hw_nmi_is_cpu_stuck(struct pt_regs *);
u64 hw_nmi_get_sample_period(void);
extern int nmi_watchdog_enabled;
struct ctl_table;
extern int proc_nmi_enabled(struct ctl_table *, int ,
void __user *, size_t *, loff_t *);
#endif
#endif

52
kernel/nmi_watchdog.c
View File

@ -30,6 +30,8 @@ static DEFINE_PER_CPU(struct perf_event *, nmi_watchdog_ev);
static DEFINE_PER_CPU(int, nmi_watchdog_touch);
static DEFINE_PER_CPU(long, alert_counter);
static int panic_on_timeout;
void touch_nmi_watchdog(void)
{
__raw_get_cpu_var(nmi_watchdog_touch) = 1;
@ -46,19 +48,49 @@ void touch_all_nmi_watchdog(void)
touch_softlockup_watchdog();
}
static int __init setup_nmi_watchdog(char *str)
{
if (!strncmp(str, "panic", 5)) {
panic_on_timeout = 1;
str = strchr(str, ',');
if (!str)
return 1;
++str;
}
return 1;
}
__setup("nmi_watchdog=", setup_nmi_watchdog);
#ifdef CONFIG_SYSCTL
/*
* proc handler for /proc/sys/kernel/nmi_watchdog
*/
int nmi_watchdog_enabled;
int proc_nmi_enabled(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
int cpu;
if (per_cpu(nmi_watchdog_ev, smp_processor_id()) == NULL)
if (!write) {
struct perf_event *event;
for_each_online_cpu(cpu) {
event = per_cpu(nmi_watchdog_ev, cpu);
if (event->state > PERF_EVENT_STATE_OFF) {
nmi_watchdog_enabled = 1;
break;
}
}
proc_dointvec(table, write, buffer, length, ppos);
return 0;
}
if (per_cpu(nmi_watchdog_ev, smp_processor_id()) == NULL) {
nmi_watchdog_enabled = 0;
else
nmi_watchdog_enabled = 1;
proc_dointvec(table, write, buffer, length, ppos);
printk("NMI watchdog failed configuration, can not be enabled\n");
return 0;
}
touch_all_nmi_watchdog();
proc_dointvec(table, write, buffer, length, ppos);
@ -81,8 +113,6 @@ struct perf_event_attr wd_attr = {
.disabled = 1,
};
static int panic_on_timeout;
void wd_overflow(struct perf_event *event, int nmi,
struct perf_sample_data *data,
struct pt_regs *regs)
@ -103,11 +133,11 @@ void wd_overflow(struct perf_event *event, int nmi,
*/
per_cpu(alert_counter,cpu) += 1;
if (per_cpu(alert_counter,cpu) == 5) {
/*
* die_nmi will return ONLY if NOTIFY_STOP happens..
*/
die_nmi("BUG: NMI Watchdog detected LOCKUP",
regs, panic_on_timeout);
if (panic_on_timeout) {
panic("NMI Watchdog detected LOCKUP on cpu %d", cpu);
} else {
WARN(1, "NMI Watchdog detected LOCKUP on cpu %d", cpu);
}
}
} else {
per_cpu(alert_counter,cpu) = 0;
@ -133,7 +163,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
/* originally wanted the below chunk to be in CPU_UP_PREPARE, but caps is unpriv for non-CPU0 */
wd_attr.sample_period = cpu_khz * 1000;
wd_attr.sample_period = hw_nmi_get_sample_period();
event = perf_event_create_kernel_counter(&wd_attr, hotcpu, -1, wd_overflow);
if (IS_ERR(event)) {
printk(KERN_ERR "nmi watchdog failed to create perf event on %i: %p\n", hotcpu, event);

15
kernel/sysctl.c
View File

@ -60,6 +60,10 @@
#include <asm/io.h>
#endif
#ifdef CONFIG_NMI_WATCHDOG
#include <linux/nmi.h>
#endif
#if defined(CONFIG_SYSCTL)
@ -692,7 +696,16 @@ static struct ctl_table kern_table[] = {
.mode = 0444,
.proc_handler = proc_dointvec,
},
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
#if defined(CONFIG_NMI_WATCHDOG)
{
.procname = "nmi_watchdog",
.data = &nmi_watchdog_enabled,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = proc_nmi_enabled,
},
#endif
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_NMI_WATCHDOG)
{
.procname = "unknown_nmi_panic",
.data = &unknown_nmi_panic,