diff options
author | Wang Nan <wangnan0@huawei.com> | 2015-10-14 12:41:13 (GMT) |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-10-28 15:48:12 (GMT) |
commit | 69d262a93a25cf475012ea2e00aeb29f4932c028 (patch) | |
tree | d1d85e664f15eb185a2451972425a0f78766fb4b | |
parent | ed63f34c026e9a60d17fa750ecdfe3f600d49393 (diff) | |
download | linux-69d262a93a25cf475012ea2e00aeb29f4932c028.tar.xz |
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>
-rw-r--r-- | tools/perf/util/bpf-loader.c | 57 | ||||
-rw-r--r-- | tools/perf/util/bpf-loader.h | 29 |
2 files changed, 86 insertions, 0 deletions
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c new file mode 100644 index 0000000..ab56073 --- /dev/null +++ b/tools/perf/util/bpf-loader.c @@ -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); +} diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h new file mode 100644 index 0000000..f402d7c --- /dev/null +++ b/tools/perf/util/bpf-loader.h @@ -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 |