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powerpc: Add accounting for Doorbell interrupts 

This patch adds a new line to /proc/interrupts to account for the
doorbell interrupts that each hardware thread has received. The total
interrupt count in /proc/stat will now also include doorbells.

 # cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3
 16:        551       1267        281        175      XICS Level     IPI
LOC:       2037       1503       1688       1625   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
CNT:          0          0          0          0   Performance monitoring interrupts
MCE:          0          0          0          0   Machine check exceptions
DBL:         42        550         20         91   Doorbell interrupts

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
This commit is contained in:
Ian Munsie 2013-03-21 19:22:52 +00:00 committed by Michael Ellerman
parent 61435690a9
commit a6a058e52a
3 changed files with 17 additions and 0 deletions
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3
arch/powerpc/include/asm/hardirq.h
View File

@ -10,6 +10,9 @@ typedef struct {
unsigned int pmu_irqs;
unsigned int mce_exceptions;
unsigned int spurious_irqs;
#ifdef CONFIG_PPC_DOORBELL
unsigned int doorbell_irqs;
#endif
} ____cacheline_aligned irq_cpustat_t;
DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

2
arch/powerpc/kernel/dbell.c
View File

@ -41,6 +41,8 @@ void doorbell_exception(struct pt_regs *regs)
may_hard_irq_enable();
__get_cpu_var(irq_stat).doorbell_irqs++;
smp_ipi_demux();
irq_exit();

12
arch/powerpc/kernel/irq.c
View File

@ -374,6 +374,15 @@ int arch_show_interrupts(struct seq_file *p, int prec)
seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
seq_printf(p, " Machine check exceptions\n");
#ifdef CONFIG_PPC_DOORBELL
if (cpu_has_feature(CPU_FTR_DBELL)) {
seq_printf(p, "%*s: ", prec, "DBL");
for_each_online_cpu(j)
seq_printf(p, "%10u ", per_cpu(irq_stat, j).doorbell_irqs);
seq_printf(p, " Doorbell interrupts\n");
}
#endif
return 0;
}
@ -387,6 +396,9 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
sum += per_cpu(irq_stat, cpu).pmu_irqs;
sum += per_cpu(irq_stat, cpu).mce_exceptions;
sum += per_cpu(irq_stat, cpu).spurious_irqs;
#ifdef CONFIG_PPC_DOORBELL
sum += per_cpu(irq_stat, cpu).doorbell_irqs;
#endif
return sum;
}