linux-kernel - [PATCH 1/2] trace,x86: Add external_interrupts to the irq

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Message-Id: <461ac057690a58e05395d07d0e1994855bb3cd7d.1537173660.git.bristot@redhat.com>
Date:   Mon, 17 Sep 2018 10:48:52 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Daniel Bristot de Oliveira <daniel@...stot.me>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andy Lutomirski <luto@...nel.org>,
        Clark Williams <williams@...hat.com>, x86@...nel.org
Subject: [PATCH 1/2] trace,x86: Add external_interrupts to the irq_vectors class

Currently, the irq_vectors is showing the entry and exit events for
the interrupts of the architecture, but not for external interrupts.
This patch adds the tracepoints for external interrupts.

Example of output:
 <idle>-0     [000] d.h.   102.890935: external_interrupt_entry: vector=35
 <idle>-0     [000] d.h.   102.890960: external_interrupt_exit: vector=35

Signed-off-by: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Clark Williams <williams@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: x86@...nel.org
---
 arch/x86/include/asm/trace/irq_vectors.h | 6 ++++++
 arch/x86/kernel/irq.c                    | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
index 0af81b590a0c..bc9669df97c9 100644
--- a/arch/x86/include/asm/trace/irq_vectors.h
+++ b/arch/x86/include/asm/trace/irq_vectors.h
@@ -138,6 +138,12 @@ DEFINE_IRQ_VECTOR_EVENT(deferred_error_apic);
 DEFINE_IRQ_VECTOR_EVENT(thermal_apic);
 #endif
 
+/*
+ * external_interrupt - called when entering/exiting from regular device
+ * interrupt vector handler.
+ */
+DEFINE_IRQ_VECTOR_EVENT(external_interrupt);
+
 TRACE_EVENT(vector_config,
 
 	TP_PROTO(unsigned int irq, unsigned int vector,
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 59b5f2ea7c2f..715afe3a4f24 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -237,6 +237,7 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
 	unsigned vector = ~regs->orig_ax;
 
 	entering_irq();
+	trace_external_interrupt_entry(vector);
 
 	/* entering_irq() tells RCU that we're not quiescent.  Check it. */
 	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
@@ -255,6 +256,7 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
 		}
 	}
 
+	trace_external_interrupt_exit(vector);
 	exiting_irq();
 
 	set_irq_regs(old_regs);
-- 
2.17.1