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perf ebpf: Add the libbpf glue 

The 'bpf-loader.[ch]' files are introduced in this patch. Which will be
the interface between perf and libbpf. bpf__prepare_load() resides in
bpf-loader.c. Following patches will enrich these two files.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1444826502-49291-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-10-14 12:41:13 +00:00 committed by Arnaldo Carvalho de Melo
parent ed63f34c02
commit 69d262a93a
2 changed files with 86 additions and 0 deletions
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57
tools/perf/util/bpf-loader.c Normal file
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@ -0,0 +1,57 @@
/*
* 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);
}

29
tools/perf/util/bpf-loader.h Normal file
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@ -0,0 +1,29 @@
/*
* Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
* Copyright (C) 2015, Huawei Inc.
*/
#ifndef __BPF_LOADER_H
#define __BPF_LOADER_H
#include <linux/compiler.h>
#include <linux/err.h>
#include <string.h>
#include "debug.h"
struct bpf_object;
#ifdef HAVE_LIBBPF_SUPPORT
struct bpf_object *bpf__prepare_load(const char *filename);
void bpf__clear(void);
#else
static inline struct bpf_object *
bpf__prepare_load(const char *filename __maybe_unused)
{
pr_debug("ERROR: eBPF object loading is disabled during compiling.\n");
return ERR_PTR(-ENOTSUP);
}
static inline void bpf__clear(void) { }
#endif
#endif