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Subject[PATCH V2 1/2] trace,x86: Add external_interrupts to the irq_vectors class
Date
Currently, the irq_vectors is showing the entry and exit events for
the interrupts of the architecture, but not for external interrupts.

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

Changes from V1:
- Fix a compilation problem when CONFIG_X86_LOCAL_APIC is not set (kbuild test)

Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Clark Williams <williams@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: x86@kernel.org
---
arch/x86/include/asm/trace/irq_vectors.h | 10 +++++++++-
arch/x86/kernel/irq.c | 2 ++
2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
index 33b9d0f0aafe..38e73d56db70 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,
@@ -385,7 +391,9 @@ TRACE_EVENT(vector_free_moved,
__entry->is_managed)
);

-
+#else /* CONFIG_X86_LOCAL_APIC */
+#define trace_external_interrupt_entry(vector) do {} while(0)
+#define trace_external_interrupt_exit(vector) do {} while(0)
#endif /* CONFIG_X86_LOCAL_APIC */

#undef TRACE_INCLUDE_PATH
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);
--
2.19.0
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