This patch utilizes bpf_object__load() provided by libbpf to load all
objects into kernel.

Signed-off-by: Wang Nan <wangn...@huawei.com>
Cc: Alexei Starovoitov <a...@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gr...@gmail.com>
Cc: Daniel Borkmann <dan...@iogearbox.net>
Cc: David Ahern <dsah...@gmail.com>
Cc: He Kuang <heku...@huawei.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Kaixu Xia <xiaka...@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Zefan Li <lize...@huawei.com>
Cc: pi3or...@163.com
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Link: 
http://lkml.kernel.org/n/1436445342-1402-24-git-send-email-wangn...@huawei.com
---
 tools/perf/builtin-record.c  | 15 +++++++++++++++
 tools/perf/util/bpf-loader.c | 28 ++++++++++++++++++++++++++++
 tools/perf/util/bpf-loader.h | 10 ++++++++++
 3 files changed, 53 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8833186..c335ac5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1158,6 +1158,21 @@ int cmd_record(int argc, const char **argv, const char 
*prefix __maybe_unused)
                goto out_symbol_exit;
        }
 
+       /*
+        * bpf__probe() also calls symbol__init() if there are probe
+        * events in bpf objects, so calling symbol_exit when failure
+        * is safe. If there is no probe event, bpf__load() always
+        * success.
+        */
+       err = bpf__load();
+       if (err) {
+               pr_err("Loading BPF programs failed:\n");
+
+               bpf__strerror_load(err, errbuf, sizeof(errbuf));
+               pr_err("\t%s\n", errbuf);
+               goto out_symbol_exit;
+       }
+
        symbol__init(NULL);
 
        if (symbol_conf.kptr_restrict)
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index ae23f6f..d63a594 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -267,6 +267,25 @@ out:
        return err < 0 ? err : 0;
 }
 
+int bpf__load(void)
+{
+       struct bpf_object *obj, *tmp;
+       int err = 0;
+
+       bpf_object__for_each_safe(obj, tmp) {
+               err = bpf_object__load(obj);
+               if (err) {
+                       pr_debug("bpf: load objects failed\n");
+                       goto errout;
+               }
+       }
+       return 0;
+errout:
+       bpf_object__for_each_safe(obj, tmp)
+               bpf_object__unload(obj);
+       return err;
+}
+
 #define bpf__strerror_head(err, buf, size) \
        char sbuf[STRERR_BUFSIZE], *emsg;\
        if (!size)\
@@ -309,3 +328,12 @@ int bpf__strerror_probe(int err, char *buf, size_t size)
        bpf__strerror_end(buf, size);
        return 0;
 }
+
+int bpf__strerror_load(int err, char *buf, size_t size)
+{
+       bpf__strerror_head(err, buf, size);
+       bpf__strerror_entry(EINVAL, "%s: add -v to see detail. Run a 
CONFIG_BPF_SYSCALL kernel?",
+                           emsg)
+       bpf__strerror_end(buf, size);
+       return 0;
+}
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index 6b09a85..4d7552e 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -19,6 +19,9 @@ int bpf__probe(void);
 int bpf__unprobe(void);
 int bpf__strerror_probe(int err, char *buf, size_t size);
 
+int bpf__load(void);
+int bpf__strerror_load(int err, char *buf, size_t size);
+
 void bpf__clear(void);
 #else
 static inline int bpf__prepare_load(const char *filename __maybe_unused)
@@ -29,6 +32,7 @@ static inline int bpf__prepare_load(const char *filename 
__maybe_unused)
 
 static inline int bpf__probe(void) { return 0; }
 static inline int bpf__unprobe(void) { return 0; }
+static inline int bpf__load(void) { return 0; }
 static inline void bpf__clear(void) { }
 
 static inline int
@@ -56,5 +60,11 @@ static inline int bpf__strerror_probe(int err __maybe_unused,
 {
        return __bpf_strerror(buf, size);
 }
+
+static inline int bpf__strerror_load(int err __maybe_unused,
+                                    char *buf, size_t size)
+{
+       return __bpf_strerror(buf, size);
+}
 #endif
 #endif
-- 
2.1.0

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