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// SPDX-License-Identifier: GPL-2.0
#include "util/evlist.h"
#include "util/pmu.h"
#include "util/pmus.h"
#include "util/topdown.h"
#include "topdown.h"
#include "evsel.h"
// cmask=0, inv=0, pc=0, edge=0, umask=4, event=0
#define TOPDOWN_SLOTS 0x0400
/* Check whether there is a PMU which supports the perf metrics. */
bool topdown_sys_has_perf_metrics(void)
{
static bool has_perf_metrics;
static bool cached;
struct perf_pmu *pmu;
if (cached)
return has_perf_metrics;
/*
* The perf metrics feature is a core PMU feature.
* The PERF_TYPE_RAW type is the type of a core PMU.
* The slots event is only available when the core PMU
* supports the perf metrics feature.
*/
pmu = perf_pmus__find_by_type(PERF_TYPE_RAW);
if (pmu && perf_pmu__have_event(pmu, "slots"))
has_perf_metrics = true;
cached = true;
return has_perf_metrics;
}
bool arch_is_topdown_slots(const struct evsel *evsel)
{
return evsel->core.attr.type == PERF_TYPE_RAW &&
evsel->core.attr.config == TOPDOWN_SLOTS &&
evsel->core.attr.config1 == 0;
}
bool arch_is_topdown_metrics(const struct evsel *evsel)
{
// cmask=0, inv=0, pc=0, edge=0, umask=0x80-0x87, event=0
return evsel->core.attr.type == PERF_TYPE_RAW &&
(evsel->core.attr.config & 0xFFFFF8FF) == 0x8000 &&
evsel->core.attr.config1 == 0;
}
/*
* Check whether a topdown group supports sample-read.
*
* Only Topdown metric supports sample-read. The slots
* event must be the leader of the topdown group.
*/
bool arch_topdown_sample_read(struct evsel *leader)
{
struct evsel *evsel;
if (!evsel__sys_has_perf_metrics(leader))
return false;
if (!arch_is_topdown_slots(leader))
return false;
/*
* If slots event as leader event but no topdown metric events
* in group, slots event should still sample as leader.
*/
evlist__for_each_entry(leader->evlist, evsel) {
if (evsel->core.leader != leader->core.leader)
continue;
if (evsel != leader && arch_is_topdown_metrics(evsel))
return true;
}
return false;
}
/*
* Make a copy of the topdown metric event metric_event with the given index but
* change its configuration to be a topdown slots event. Copying from
* metric_event ensures modifiers are the same.
*/
int topdown_insert_slots_event(struct list_head *list, int idx, struct evsel *metric_event)
{
struct evsel *evsel = evsel__new_idx(&metric_event->core.attr, idx);
if (!evsel)
return -ENOMEM;
evsel->core.attr.config = TOPDOWN_SLOTS;
evsel->core.cpus = perf_cpu_map__get(metric_event->core.cpus);
evsel->core.pmu_cpus = perf_cpu_map__get(metric_event->core.pmu_cpus);
evsel->core.is_pmu_core = true;
evsel->pmu = metric_event->pmu;
evsel->name = strdup("slots");
evsel->precise_max = metric_event->precise_max;
evsel->sample_read = metric_event->sample_read;
evsel->weak_group = metric_event->weak_group;
evsel->bpf_counter = metric_event->bpf_counter;
evsel->retire_lat = metric_event->retire_lat;
evsel__set_leader(evsel, evsel__leader(metric_event));
list_add_tail(&evsel->core.node, list);
return 0;
}
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