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Commit 57d74123 authored by Will Deacon's avatar Will Deacon
Browse files

arm64: perf: add format entry to describe event -> config mapping 



It's all very well providing an events directory to userspace that
details our events in terms of "event=0xNN", but if we don't define how
to encode the "event" field in the perf attr.config, then it's a waste
of time.

This patch adds a single format entry to describe that the event field
occupies the bottom 10 bits of our config field on ARMv8 (PMUv3).

Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent abff083c

arch/arm64/kernel/perf_event.c

+16 −2
Original line number Diff line number Diff line
@@ -297,7 +297,7 @@ static struct attribute *armv8_pmuv3_event_attrs[] = { 
	&armv8_event_attr_l21_tlb_refill.attr.attr,

	&armv8_event_attr_l2d_tlb.attr.attr,

	&armv8_event_attr_l21_tlb.attr.attr,

	NULL

	NULL,

};



static struct attribute_group armv8_pmuv3_events_attr_group = {
@@ -305,11 +305,25 @@ static struct attribute_group armv8_pmuv3_events_attr_group = { 
	.attrs = armv8_pmuv3_event_attrs,

};



PMU_FORMAT_ATTR(event, "config:0-9");



static struct attribute *armv8_pmuv3_format_attrs[] = {

	&format_attr_event.attr,

	NULL,

};



static struct attribute_group armv8_pmuv3_format_attr_group = {

	.name = "format",

	.attrs = armv8_pmuv3_format_attrs,

};



static const struct attribute_group *armv8_pmuv3_attr_groups[] = {

	&armv8_pmuv3_events_attr_group,

	NULL

	&armv8_pmuv3_format_attr_group,

	NULL,

};





/*

 * Perf Events' indices

 */