> From: Ian Munsie <imun...@au1.ibm.com>
>
> 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.
It's probably worth noting in the comment that these are not being
accounted at all currently, even in the existing IPI line in
/proc/interrupts.
Mikey
> # 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 <imun...@au1.ibm.com>
> ---
> arch/powerpc/include/asm/hardirq.h | 1 +
> arch/powerpc/kernel/dbell.c | 2 ++
> arch/powerpc/kernel/irq.c | 8 ++++++++
> 3 files changed, 11 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/hardirq.h
> b/arch/powerpc/include/asm/hardirq.h
> index 3147a29..e88c5f2 100644
> --- a/arch/powerpc/include/asm/hardirq.h
> +++ b/arch/powerpc/include/asm/hardirq.h
> @@ -10,6 +10,7 @@ typedef struct {
> unsigned int pmu_irqs;
> unsigned int mce_exceptions;
> unsigned int spurious_irqs;
> + unsigned int doorbell_irqs;
> } ____cacheline_aligned irq_cpustat_t;
>
> DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
> diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
> index 9ebbc24..d55c76c 100644
> --- a/arch/powerpc/kernel/dbell.c
> +++ b/arch/powerpc/kernel/dbell.c
> @@ -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();
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 4f97fe3..3a3c3b9 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -374,6 +374,13 @@ 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");
>
> + 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");
> + }
> +
> return 0;
> }
>
> @@ -387,6 +394,7 @@ 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;
> + sum += per_cpu(irq_stat, cpu).doorbell_irqs;
>
> return sum;
> }
> --
> 1.7.10.4
>
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
