trace: Add trace_ipi_send_cpumask()

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20230307143558.294354-2-vschneid@redhat.com

diff --git a/include/trace/events/ipi.h b/include/trace/events/ipi.h
index 0be71da..b1125dc 100644 (file)
--- 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),