[PATCH] powerpc: make irq_stat.timers_irqs counting more specific

[Fan Du]

Current irq_stat.timers_irqs counting doesn't discriminate timer event handler
and other timer interrupt(like arch_irq_work_raise). Sometimes we need to know
exactly how much interrupts timer event handler fired, so let's be more specific
on this.

Signed-off-by: Fan Du <fan...@windriver.com>
---
 arch/powerpc/include/asm/hardirq.h |    3 ++-
 arch/powerpc/kernel/irq.c          |   12 +++++++++---
 arch/powerpc/kernel/time.c         |    3 ++-
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/hardirq.h 
b/arch/powerpc/include/asm/hardirq.h
index 3147a29..ff8bfdc 100644
--- a/arch/powerpc/include/asm/hardirq.h
+++ b/arch/powerpc/include/asm/hardirq.h
@@ -6,7 +6,8 @@
 
 typedef struct {
        unsigned int __softirq_pending;
-       unsigned int timer_irqs;
+       unsigned int timer_irqs_event;
+       unsigned int timer_irqs_others;
        unsigned int pmu_irqs;
        unsigned int mce_exceptions;
        unsigned int spurious_irqs;
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 71413f4..101127d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -349,8 +349,13 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 
        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, "%10u ", per_cpu(irq_stat, j).timer_irqs_event);
+        seq_printf(p, "  Local timer interrupts for timer event device\n");
+
+       seq_printf(p, "%*s: ", prec, "LOC");
+       for_each_online_cpu(j)
+               seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_others);
+        seq_printf(p, "  Local timer interrupts for others\n");
 
        seq_printf(p, "%*s: ", prec, "SPU");
        for_each_online_cpu(j)
@@ -375,11 +380,12 @@ int arch_show_interrupts(struct seq_file *p, int prec)
  */
 u64 arch_irq_stat_cpu(unsigned int cpu)
 {
-       u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
+       u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event;
 
        sum += per_cpu(irq_stat, cpu).pmu_irqs;
        sum += per_cpu(irq_stat, cpu).mce_exceptions;
        sum += per_cpu(irq_stat, cpu).spurious_irqs;
+       sum += per_cpu(irq_stat, cpu).timer_irqs_others;
 
        return sum;
 }
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index b3b1435..7e7c553 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -504,7 +504,6 @@ void timer_interrupt(struct pt_regs * regs)
         */
        may_hard_irq_enable();
 
-       __get_cpu_var(irq_stat).timer_irqs++;
 
 #if defined(CONFIG_PPC32) && defined(CONFIG_PMAC)
        if (atomic_read(&ppc_n_lost_interrupts) != 0)
@@ -526,10 +525,12 @@ void timer_interrupt(struct pt_regs * regs)
                *next_tb = ~(u64)0;
                if (evt->event_handler)
                        evt->event_handler(evt);
+               __get_cpu_var(irq_stat).timer_irqs_event++;
        } else {
                now = *next_tb - now;
                if (now <= DECREMENTER_MAX)
                        set_dec((int)now);
+               __get_cpu_var(irq_stat).timer_irqs_others++;
        }
 
 #ifdef CONFIG_PPC64
-- 
1.7.1

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