tools/perf/util/bpf-loader.c

/*
 * bpf-loader.c
 *
 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
 * Copyright (C) 2015 Huawei Inc.
 */

#include <bpf/libbpf.h>
#include <linux/err.h>
#include "perf.h"
#include "debug.h"
#include "bpf-loader.h"

#define DEFINE_PRINT_FN(name, level) \
static int libbpf_##name(const char *fmt, ...)	\
{						\
	va_list args;				\
	int ret;				\
						\
	va_start(args, fmt);			\
	ret = veprintf(level, verbose, pr_fmt(fmt), args);\
	va_end(args);				\
	return ret;				\
}

DEFINE_PRINT_FN(warning, 0)
DEFINE_PRINT_FN(info, 0)
DEFINE_PRINT_FN(debug, 1)

struct bpf_object *bpf__prepare_load(const char *filename)
{
	struct bpf_object *obj;
	static bool libbpf_initialized;

	if (!libbpf_initialized) {
		libbpf_set_print(libbpf_warning,
				 libbpf_info,
				 libbpf_debug);
		libbpf_initialized = true;
	}

	obj = bpf_object__open(filename);
	if (!obj) {
		pr_debug("bpf: failed to load %s\n", filename);
		return ERR_PTR(-EINVAL);
	}

	return obj;
}

void bpf__clear(void)
{
	struct bpf_object *obj, *tmp;

	bpf_object__for_each_safe(obj, tmp)
		bpf_object__close(obj);
}