From: Daniel Thompson <daniel.thompson@linaro.org> To: Thomas Gleixner <tglx@linutronix.de>, Jason Cooper <jason@lakedaemon.net>, Russell King <linux@arm.linux.org.uk> Cc: Daniel Thompson <daniel.thompson@linaro.org>, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, patches@linaro.org, linaro-kernel@lists.linaro.org, John Stultz <john.stultz@linaro.org>, Sumit Semwal <sumit.semwal@linaro.org>, Dirk Behme <dirk.behme@de.bosch.com>, Daniel Drake <drake@endlessm.com>, Dmitry Pervushin <dpervushin@gmail.com>, Tim Sander <tim@krieglstein.org>, Stephen Boyd <sboyd@codeaurora.org> Subject: [RFC PATCH 1/5] arm: irq: Add a __nmi_count stat Date: Tue, 13 Jan 2015 16:35:27 +0000 [thread overview] Message-ID: <1421166931-14134-2-git-send-email-daniel.thompson@linaro.org> (raw) In-Reply-To: <1421166931-14134-1-git-send-email-daniel.thompson@linaro.org> 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> --- arch/arm/include/asm/hardirq.h | 1 + arch/arm/kernel/irq.c | 7 ++++++- arch/arm/kernel/traps.c | 2 ++ 3 files changed, 9 insertions(+), 1 deletion(-) 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 -- 1.9.3
WARNING: multiple messages have this Message-ID (diff)
From: daniel.thompson@linaro.org (Daniel Thompson) To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 1/5] arm: irq: Add a __nmi_count stat Date: Tue, 13 Jan 2015 16:35:27 +0000 [thread overview] Message-ID: <1421166931-14134-2-git-send-email-daniel.thompson@linaro.org> (raw) In-Reply-To: <1421166931-14134-1-git-send-email-daniel.thompson@linaro.org> 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> --- arch/arm/include/asm/hardirq.h | 1 + arch/arm/kernel/irq.c | 7 ++++++- arch/arm/kernel/traps.c | 2 ++ 3 files changed, 9 insertions(+), 1 deletion(-) 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 -- 1.9.3
next prev parent reply other threads:[~2015-01-13 16:36 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-13 16:35 [RFC PATCH 0/5] irq: Allow irqs to be routed to NMI/FIQ Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson [this message] 2015-01-13 16:35 ` [RFC PATCH 1/5] arm: irq: Add a __nmi_count stat Daniel Thompson 2015-01-13 16:35 ` [RFC PATCH 2/5] irq: Allow interrupts to routed to NMI (or similar) Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson 2015-01-19 16:21 ` Joshua Clayton 2015-01-19 16:21 ` Joshua Clayton 2015-01-19 17:33 ` Daniel Thompson 2015-01-19 17:33 ` Daniel Thompson 2015-01-13 16:35 ` [RFC PATCH 3/5] irq: gic: Add support for NMI routing Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson 2015-01-13 16:35 ` [RFC PATCH 4/5] arm: perf: Make v7 support FIQ-safe Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson 2015-01-13 16:35 ` [RFC PATCH 5/5] arm: perf: Use FIQ to handle PMU events Daniel Thompson 2015-01-13 16:35 ` Daniel Thompson 2015-01-19 16:35 ` Joshua Clayton 2015-01-19 16:35 ` Joshua Clayton 2015-01-20 10:18 ` Daniel Thompson 2015-01-20 10:18 ` Daniel Thompson 2015-01-20 17:35 ` Joshua Clayton 2015-01-20 17:35 ` Joshua Clayton 2015-01-19 17:48 ` Russell King - ARM Linux 2015-01-19 17:48 ` Russell King - ARM Linux 2015-01-20 10:04 ` Daniel Thompson 2015-01-20 10:04 ` Daniel Thompson 2015-01-21 17:03 ` [RFC PATCH v2 0/5] irq: Allow irqs to be routed to NMI/FIQ Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson 2015-01-21 17:03 ` [RFC PATCH v2 1/5] arm: irq: Add a __nmi_count stat Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson 2015-01-21 17:03 ` [RFC PATCH v2 2/5] irq: Allow interrupts to routed to NMI (or similar) Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson 2015-01-24 23:37 ` Thomas Gleixner 2015-01-24 23:37 ` Thomas Gleixner 2015-01-21 17:03 ` [RFC PATCH v2 3/5] irq: gic: Add support for NMI routing Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson 2015-01-21 17:03 ` [RFC PATCH v2 4/5] arm: perf: Make v7 support FIQ-safe Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson 2015-01-21 17:03 ` [RFC PATCH v2 5/5] arm: perf: Use FIQ to handle PMU events Daniel Thompson 2015-01-21 17:03 ` Daniel Thompson
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