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powerpc: Add irq accounting for watchdog interrupts 

This adds an irq counter for the watchdog soft-NMI. This interrupt
only fires when interrupts are soft-disabled, so it will not
increment much even when the watchdog is running. However it's
useful for debugging and sanity checking.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-08-01 22:00:54 +10:00 committed by Michael Ellerman
parent ca41ad4377
commit 04019bf8eb
3 changed files with 16 additions and 0 deletions
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3
arch/powerpc/include/asm/hardirq.h
View File

@ -13,6 +13,9 @@ typedef struct {
unsigned int spurious_irqs;
unsigned int hmi_exceptions;
unsigned int sreset_irqs;
#ifdef CONFIG_PPC_WATCHDOG
unsigned int soft_nmi_irqs;
#endif
#ifdef CONFIG_PPC_DOORBELL
unsigned int doorbell_irqs;
#endif

10
arch/powerpc/kernel/irq.c
View File

@ -475,6 +475,13 @@ int arch_show_interrupts(struct seq_file *p, int prec)
seq_printf(p, "%10u ", per_cpu(irq_stat, j).sreset_irqs);
seq_printf(p, " System Reset interrupts\n");
#ifdef CONFIG_PPC_WATCHDOG
seq_printf(p, "%*s: ", prec, "WDG");
for_each_online_cpu(j)
seq_printf(p, "%10u ", per_cpu(irq_stat, j).soft_nmi_irqs);
seq_printf(p, " Watchdog soft-NMI interrupts\n");
#endif
#ifdef CONFIG_PPC_DOORBELL
if (cpu_has_feature(CPU_FTR_DBELL)) {
seq_printf(p, "%*s: ", prec, "DBL");
@ -500,6 +507,9 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
sum += per_cpu(irq_stat, cpu).timer_irqs_others;
sum += per_cpu(irq_stat, cpu).hmi_exceptions;
sum += per_cpu(irq_stat, cpu).sreset_irqs;
#ifdef CONFIG_PPC_WATCHDOG
sum += per_cpu(irq_stat, cpu).soft_nmi_irqs;
#endif
#ifdef CONFIG_PPC_DOORBELL
sum += per_cpu(irq_stat, cpu).doorbell_irqs;
#endif

3
arch/powerpc/kernel/watchdog.c
View File

@ -204,6 +204,9 @@ void soft_nmi_interrupt(struct pt_regs *regs)
return;
nmi_enter();
__this_cpu_inc(irq_stat.soft_nmi_irqs);
tb = get_tb();
if (tb - per_cpu(wd_timer_tb, cpu) >= wd_panic_timeout_tb) {
per_cpu(wd_timer_tb, cpu) = tb;