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| author | Daniel Thompson <daniel.thompson@linaro.org> | 2014-12-10 15:34:39 +0000 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2015-01-27 11:58:33 +0000 |
| commit | 8c0afa1296f0b73502e4354923a651d7faccd238 (patch) | |
| tree | 24dd1e3ff8183b4ecdf8cdeb45d39448752cd5b0 | |
| parent | 2a3398f218ada6feaf3f5714c374168a59694eae (diff) | |
| download | linux-8c0afa1296f0b73502e4354923a651d7faccd238.tar.gz | |
arm: irq: Add a __nmi_count stat
Extends the irq statistics for ARM, making it possible to quickly
observe how many times the default FIQ handler has executed.
In /proc/interrupts we use the NMI terminology (rather than FIQ) because
the statistic is only likely to be updated when we run the default FIQ
handler (handle_fiq_as_nmi).
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
| -rw-r--r-- | arch/arm/include/asm/hardirq.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/irq.c | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/traps.c | 2 |
3 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm/include/asm/hardirq.h b/arch/arm/include/asm/hardirq.h index 5df33e30ae1b..27ab43b5d7e2 100644 --- a/arch/arm/include/asm/hardirq.h +++ b/arch/arm/include/asm/hardirq.h @@ -9,6 +9,7 @@ typedef struct { unsigned int __softirq_pending; + unsigned int __nmi_count; #ifdef CONFIG_SMP unsigned int ipi_irqs[NR_IPI]; #endif diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index ad857bada96c..6dd1619e0700 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -48,13 +48,18 @@ unsigned long irq_err_count; int arch_show_interrupts(struct seq_file *p, int prec) { + int i; + #ifdef CONFIG_FIQ show_fiq_list(p, prec); #endif #ifdef CONFIG_SMP show_ipi_list(p, prec); #endif - seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); + seq_printf(p, "%*s: ", prec, "NMI"); + for_each_online_cpu(i) + seq_printf(p, "%10u ", __get_irq_stat(i, __nmi_count)); + seq_printf(p, "\n%*s: %10lu\n", prec, "Err", irq_err_count); return 0; } diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 1836415b8a5c..5645f81ac4cc 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -476,8 +476,10 @@ die_sig: */ asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) { + unsigned int cpu = smp_processor_id(); struct pt_regs *old_regs = set_irq_regs(regs); + __inc_irq_stat(cpu, __nmi_count); nmi_enter(); #ifdef CONFIG_ARM_GIC |