powerpc: Add timer, performance monitor and machine check counts to /proc/interrupts

With NO_HZ it is useful to know how often the decrementer is going off. The
patch below adds an entry for it and also adds it into the /proc/stat
summaries.

While here, I added performance monitoring and machine check exceptions.
I found it useful to keep an eye on the PMU exception rate
when using the perf tool. Since it's possible to take a completely
handled machine check on a System p box it also sounds like a good idea to
keep a machine check summary.

The event naming matches x86 to keep gratuitous differences to a minimum.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index b9cbb457004..710505240f2 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -196,6 +196,21 @@ static int show_other_interrupts(struct seq_file *p, int prec)
         }
 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
 
+        seq_printf(p, "%*s: ", prec, "LOC");
+        for_each_online_cpu(j)
+                seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
+        seq_printf(p, "  Local timer interrupts\n");
+
+        seq_printf(p, "%*s: ", prec, "CNT");
+        for_each_online_cpu(j)
+                seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
+        seq_printf(p, "  Performance monitoring interrupts\n");
+
+        seq_printf(p, "%*s: ", prec, "MCE");
+        for_each_online_cpu(j)
+                seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
+        seq_printf(p, "  Machine check exceptions\n");
+
         seq_printf(p, "%*s: %10u\n", prec, "BAD", ppc_spurious_interrupts);
 
         return 0;
@@ -258,6 +273,26 @@ out:
         return 0;
 }
 
+/*
+ * /proc/stat helpers
+ */
+u64 arch_irq_stat_cpu(unsigned int cpu)
+{
+        u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
+
+        sum += per_cpu(irq_stat, cpu).pmu_irqs;
+        sum += per_cpu(irq_stat, cpu).mce_exceptions;
+
+        return sum;
+}
+
+u64 arch_irq_stat(void)
+{
+        u64 sum = ppc_spurious_interrupts;
+
+        return sum;
+}
+
 #ifdef CONFIG_HOTPLUG_CPU
 void fixup_irqs(cpumask_t map)
 {