linux/tools/perf/util/topdown.c

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include "pmu.h"
#include "pmu-hybrid.h"
#include "topdown.h"

int topdown_filter_events(const char **attr, char **str, bool use_group,
			  const char *pmu_name)
{
	int off = 0;
	int i;
	int len = 0;
	char *s;
	bool is_hybrid = perf_pmu__is_hybrid(pmu_name);

	for (i = 0; attr[i]; i++) {
		if (pmu_have_event(pmu_name, attr[i])) {
			if (is_hybrid)
				len += strlen(attr[i]) + strlen(pmu_name) + 3;
			else
				len += strlen(attr[i]) + 1;
			attr[i - off] = attr[i];
		} else
			off++;
	}
	attr[i - off] = NULL;

	*str = malloc(len + 1 + 2);
	if (!*str)
		return -1;
	s = *str;
	if (i - off == 0) {
		*s = 0;
		return 0;
	}
	if (use_group)
		*s++ = '{';
	for (i = 0; attr[i]; i++) {
		if (!is_hybrid)
			strcpy(s, attr[i]);
		else
			sprintf(s, "%s/%s/", pmu_name, attr[i]);
		s += strlen(s);
		*s++ = ',';
	}
	if (use_group) {
		s[-1] = '}';
		*s = 0;
	} else
		s[-1] = 0;
	return 0;
}

__weak bool arch_topdown_check_group(bool *warn)
{
	*warn = false;
	return false;
}

__weak void arch_topdown_group_warn(void)
{
}

__weak bool arch_topdown_sample_read(struct evsel *leader __maybe_unused)
{
	return false;
}

__weak const char *arch_get_topdown_pmu_name(struct evlist *evlist
					     __maybe_unused,
					     bool warn __maybe_unused)
{
	return "cpu";
}