[PATCH 2/5] alpha/perf: add sysfs format and event attributes

[Matt Turner]

The Alpha PMU registers with no attribute groups, so the perf tool has no
way to learn the raw config layout, and the PMU's own events can only be
named as raw hex numbers.

Describe the event field in format/event and export aliases for the four
EV67 event types. mbox-replay has no generic hardware event, and can now
be named as cpu/mbox-replay/.

Signed-off-by: Matt Turner <mattst88@xxxxxxxxx>
---
 arch/alpha/kernel/perf_event.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c
index 2d9383425357..70840c05d39b 100644
--- a/arch/alpha/kernel/perf_event.c
+++ b/arch/alpha/kernel/perf_event.c
@@ -212,6 +212,44 @@ static int ev67_raw_event_valid(u64 config)
 };
 
 
+PMU_FORMAT_ATTR(event, "config:0-7");
+
+static struct attribute *ev67_format_attrs[] = {
+	&format_attr_event.attr,
+	NULL,
+};
+
+static const struct attribute_group ev67_format_group = {
+	.name = "format",
+	.attrs = ev67_format_attrs,
+};
+
+/* Values must match enum ev67_pmc_event_type. */
+PMU_EVENT_ATTR_STRING(cycles, ev67_event_cycles, "event=0x01");
+PMU_EVENT_ATTR_STRING(instructions, ev67_event_instructions, "event=0x02");
+PMU_EVENT_ATTR_STRING(bcache-misses, ev67_event_bcache_misses, "event=0x03");
+PMU_EVENT_ATTR_STRING(mbox-replay, ev67_event_mbox_replay, "event=0x04");
+
+static struct attribute *ev67_event_attrs[] = {
+	&ev67_event_cycles.attr.attr,
+	&ev67_event_instructions.attr.attr,
+	&ev67_event_bcache_misses.attr.attr,
+	&ev67_event_mbox_replay.attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ev67_events_group = {
+	.name = "events",
+	.attrs = ev67_event_attrs,
+};
+
+static const struct attribute_group *ev67_attr_groups[] = {
+	&ev67_format_group,
+	&ev67_events_group,
+	NULL,
+};
+
+
 static const struct alpha_pmu_t ev67_pmu = {
 	.event_map = ev67_perfmon_event_map,
 	.max_events = ARRAY_SIZE(ev67_perfmon_event_map),
@@ -761,6 +799,7 @@ static struct pmu pmu = {
 	.start		= alpha_pmu_start,
 	.stop		= alpha_pmu_stop,
 	.read		= alpha_pmu_read,
+	.attr_groups	= ev67_attr_groups,
 	.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
 };
 

-- 
2.55.0