summaryrefslogtreecommitdiff
path: root/arch/mn10300/kernel/mn10300-watchdog.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/kernel/mn10300-watchdog.c')
-rw-r--r--arch/mn10300/kernel/mn10300-watchdog.c100
1 files changed, 61 insertions, 39 deletions
diff --git a/arch/mn10300/kernel/mn10300-watchdog.c b/arch/mn10300/kernel/mn10300-watchdog.c
index f362d9d138f1..965dd61656c3 100644
--- a/arch/mn10300/kernel/mn10300-watchdog.c
+++ b/arch/mn10300/kernel/mn10300-watchdog.c
@@ -30,7 +30,7 @@
static DEFINE_SPINLOCK(watchdog_print_lock);
static unsigned int watchdog;
static unsigned int watchdog_hz = 1;
-unsigned int watchdog_alert_counter;
+unsigned int watchdog_alert_counter[NR_CPUS];
EXPORT_SYMBOL(touch_nmi_watchdog);
@@ -39,9 +39,6 @@ EXPORT_SYMBOL(touch_nmi_watchdog);
* is to check its timer makes IRQ counts. If they are not
* changing then that CPU has some problem.
*
- * as these watchdog NMI IRQs are generated on every CPU, we only
- * have to check the current processor.
- *
* since NMIs dont listen to _any_ locks, we have to be extremely
* careful not to rely on unsafe variables. The printk might lock
* up though, so we have to break up any console locks first ...
@@ -69,8 +66,8 @@ int __init check_watchdog(void)
printk(KERN_INFO "OK.\n");
- /* now that we know it works we can reduce NMI frequency to
- * something more reasonable; makes a difference in some configs
+ /* now that we know it works we can reduce NMI frequency to something
+ * more reasonable; makes a difference in some configs
*/
watchdog_hz = 1;
@@ -121,15 +118,22 @@ void __init watchdog_go(void)
}
}
+#ifdef CONFIG_SMP
+static void watchdog_dump_register(void *dummy)
+{
+ printk(KERN_ERR "--- Register Dump (CPU%d) ---\n", CPUID);
+ show_registers(__frame);
+}
+#endif
+
asmlinkage
void watchdog_interrupt(struct pt_regs *regs, enum exception_code excep)
{
-
/*
* Since current-> is always on the stack, and we always switch
* the stack NMI-atomically, it's safe to use smp_processor_id().
*/
- int sum, cpu = smp_processor_id();
+ int sum, cpu;
int irq = NMIIRQ;
u8 wdt, tmp;
@@ -138,43 +142,61 @@ void watchdog_interrupt(struct pt_regs *regs, enum exception_code excep)
tmp = WDCTR;
NMICR = NMICR_WDIF;
- nmi_count(cpu)++;
+ nmi_count(smp_processor_id())++;
kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
- sum = irq_stat[cpu].__irq_count;
-
- if (last_irq_sums[cpu] == sum) {
- /*
- * Ayiee, looks like this CPU is stuck ...
- * wait a few IRQs (5 seconds) before doing the oops ...
- */
- watchdog_alert_counter++;
- if (watchdog_alert_counter == 5 * watchdog_hz) {
- spin_lock(&watchdog_print_lock);
+
+ for_each_online_cpu(cpu) {
+
+ sum = irq_stat[cpu].__irq_count;
+
+ if ((last_irq_sums[cpu] == sum)
+#if defined(CONFIG_GDBSTUB) && defined(CONFIG_SMP)
+ && !(CHK_GDBSTUB_BUSY()
+ || atomic_read(&cpu_doing_single_step))
+#endif
+ ) {
/*
- * We are in trouble anyway, lets at least try
- * to get a message out.
+ * Ayiee, looks like this CPU is stuck ...
+ * wait a few IRQs (5 seconds) before doing the oops ...
*/
- bust_spinlocks(1);
- printk(KERN_ERR
- "NMI Watchdog detected LOCKUP on CPU%d,"
- " pc %08lx, registers:\n",
- cpu, regs->pc);
- show_registers(regs);
- printk("console shuts up ...\n");
- console_silent();
- spin_unlock(&watchdog_print_lock);
- bust_spinlocks(0);
+ watchdog_alert_counter[cpu]++;
+ if (watchdog_alert_counter[cpu] == 5 * watchdog_hz) {
+ spin_lock(&watchdog_print_lock);
+ /*
+ * We are in trouble anyway, lets at least try
+ * to get a message out.
+ */
+ bust_spinlocks(1);
+ printk(KERN_ERR
+ "NMI Watchdog detected LOCKUP on CPU%d,"
+ " pc %08lx, registers:\n",
+ cpu, regs->pc);
+#ifdef CONFIG_SMP
+ printk(KERN_ERR
+ "--- Register Dump (CPU%d) ---\n",
+ CPUID);
+#endif
+ show_registers(regs);
+#ifdef CONFIG_SMP
+ smp_nmi_call_function(watchdog_dump_register,
+ NULL, 1);
+#endif
+ printk(KERN_NOTICE "console shuts up ...\n");
+ console_silent();
+ spin_unlock(&watchdog_print_lock);
+ bust_spinlocks(0);
#ifdef CONFIG_GDBSTUB
- if (gdbstub_busy)
- gdbstub_exception(regs, excep);
- else
- gdbstub_intercept(regs, excep);
+ if (CHK_GDBSTUB_BUSY_AND_ACTIVE())
+ gdbstub_exception(regs, excep);
+ else
+ gdbstub_intercept(regs, excep);
#endif
- do_exit(SIGSEGV);
+ do_exit(SIGSEGV);
+ }
+ } else {
+ last_irq_sums[cpu] = sum;
+ watchdog_alert_counter[cpu] = 0;
}
- } else {
- last_irq_sums[cpu] = sum;
- watchdog_alert_counter = 0;
}
WDCTR = wdt | WDCTR_WDRST;