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From: Valentin Schneider <vschneid@redhat.com>
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Subject: [PATCH v5 1/7] trace: Add trace_ipi_send_cpumask()
Date: Tue,  7 Mar 2023 14:35:52 +0000
Message-Id: <20230307143558.294354-2-vschneid@redhat.com>
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Cc: Juri Lelli <juri.lelli@redhat.com>, Mark Rutland <mark.rutland@arm.com>, Dave Hansen <dave.hansen@linux.intel.com>, "Paul E. McKenney" <paulmck@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Marc Zyngier <maz@kernel.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Marcelo Tosatti <mtosatti@redhat.com>, Russell King <linux@armlinux.org.uk>, Steven Rostedt <rostedt@goodmis.org>, "David S. Miller" <davem@davemloft.net>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Nicholas Piggin <npiggin@gmail.com>, "H. Peter Anvin" <hpa@zytor.com>, Guo Ren <guoren@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Daniel Bristot de Oliveira <bristot@redhat.com>, Frederic Weisbecker <frederic@kernel.org>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev" <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

trace_ipi_raise() is unsuitable for generically tracing IPI sources due to
its "reason" argument being an uninformative string (on arm64 all you get
is "Function call interrupts" for SMP calls).

Add a variant of it that exports a target cpumask, a callsite and a callback.

Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 include/trace/events/ipi.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/trace/events/ipi.h b/include/trace/events/ipi.h
index 0be71dad6ec03..b1125dc27682c 100644
--- a/include/trace/events/ipi.h
+++ b/include/trace/events/ipi.h
@@ -35,6 +35,28 @@ TRACE_EVENT(ipi_raise,
 	TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
 );
 
+TRACE_EVENT(ipi_send_cpumask,
+
+	TP_PROTO(const struct cpumask *cpumask, unsigned long callsite, void *callback),
+
+	TP_ARGS(cpumask, callsite, callback),
+
+	TP_STRUCT__entry(
+		__cpumask(cpumask)
+		__field(void *, callsite)
+		__field(void *, callback)
+	),
+
+	TP_fast_assign(
+		__assign_cpumask(cpumask, cpumask_bits(cpumask));
+		__entry->callsite = (void *)callsite;
+		__entry->callback = callback;
+	),
+
+	TP_printk("cpumask=%s callsite=%pS callback=%pS",
+		  __get_cpumask(cpumask), __entry->callsite, __entry->callback)
+);
+
 DECLARE_EVENT_CLASS(ipi_handler,
 
 	TP_PROTO(const char *reason),
-- 
2.31.1