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ARM: 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 8 bits of our config field on ARMv7.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2015-12-22 14:42:57 +00:00
parent 60792ad349
commit abff083ce2
1 changed files with 18 additions and 4 deletions
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22
arch/arm/kernel/perf_event_v7.c
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@ -531,6 +531,18 @@ static const unsigned scorpion_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
[C(BPU)][C(OP_WRITE)][C(RESULT_MISS)] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
};
PMU_FORMAT_ATTR(event, "config:0-7");
static struct attribute *armv7_pmu_format_attrs[] = {
&format_attr_event.attr,
NULL,
};
static struct attribute_group armv7_pmu_format_attr_group = {
.name = "format",
.attrs = armv7_pmu_format_attrs,
};
#define ARMV7_EVENT_ATTR_RESOLVE(m) #m
#define ARMV7_EVENT_ATTR(name, config) \
PMU_EVENT_ATTR_STRING(name, armv7_event_attr_##name, \
@ -576,7 +588,7 @@ static struct attribute *armv7_pmuv1_event_attrs[] = {
&armv7_event_attr_br_mis_pred.attr.attr,
&armv7_event_attr_cpu_cycles.attr.attr,
&armv7_event_attr_br_pred.attr.attr,
NULL
NULL,
};
static struct attribute_group armv7_pmuv1_events_attr_group = {
@ -586,7 +598,8 @@ static struct attribute_group armv7_pmuv1_events_attr_group = {
static const struct attribute_group *armv7_pmuv1_attr_groups[] = {
&armv7_pmuv1_events_attr_group,
NULL
&armv7_pmu_format_attr_group,
NULL,
};
ARMV7_EVENT_ATTR(mem_access, ARMV7_PERFCTR_MEM_ACCESS);
@ -632,7 +645,7 @@ static struct attribute *armv7_pmuv2_event_attrs[] = {
&armv7_event_attr_inst_spec.attr.attr,
&armv7_event_attr_ttbr_write_retired.attr.attr,
&armv7_event_attr_bus_cycles.attr.attr,
NULL
NULL,
};
static struct attribute_group armv7_pmuv2_events_attr_group = {
@ -642,7 +655,8 @@ static struct attribute_group armv7_pmuv2_events_attr_group = {
static const struct attribute_group *armv7_pmuv2_attr_groups[] = {
&armv7_pmuv2_events_attr_group,
NULL
&armv7_pmu_format_attr_group,
NULL,
};
/*