linux-kernel - [RFC PATCH v2 33/37] tools perf bpf: load eBPF object into kernel.

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Date:	Fri, 15 May 2015 07:51:26 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<acme@...nel.org>, <namhyung@...nel.org>, <jolsa@...nel.org>,
	<adrian.hunter@...el.com>, <dsahern@...il.com>, <ast@...mgrid.com>,
	<daniel@...earbox.net>, <brendan.d.gregg@...il.com>,
	<masami.hiramatsu.pt@...achi.com>
CC:	<linux-kernel@...r.kernel.org>, <lizefan@...wei.com>,
	<pi3orama@....com>, <wangnan0@...wei.com>
Subject: [RFC PATCH v2 33/37] tools perf bpf: load eBPF object into kernel.

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

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 tools/perf/builtin-bpf.c     |  5 +++++
 tools/perf/util/bpf-loader.c | 16 ++++++++++++++++
 tools/perf/util/bpf-loader.h |  3 ++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-bpf.c b/tools/perf/builtin-bpf.c
index 95e0c65..8155f39 100644
--- a/tools/perf/builtin-bpf.c
+++ b/tools/perf/builtin-bpf.c
@@ -162,6 +162,11 @@ static int cmd_bpf_record(int argc, const char **argv,
 		goto errout;
 	}
 
+	if (bpf_load()) {
+		pr_err("bpf: failed to load\n");
+		goto errout;
+	}
+
 	return start_bpf_record(argc, argv);
 usage:
 	usage_with_options(bpf_record_usage, options);
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index c820d1a..7295a3b 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -214,3 +214,19 @@ int bpf_probe(void)
 
 	return err < 0 ? err : 0;
 }
+
+int bpf_load(void)
+{
+	size_t i;
+	int err;
+
+	for (i = 0; i < params.nr_objects; i++) {
+		err = bpf_load_object(params.objects[i]);
+		if (err) {
+			pr_err("failed to load object\n");
+			return err;
+		}
+	}
+
+	return 0;
+}
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index 30dea2e..1ccebdf 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -9,7 +9,8 @@
 
 int bpf_prepare_load(const char *filename);
 int bpf_probe(void);
-int bpf_unprobe(void);
+int bpf_load(void);
 
+int bpf_unprobe(void);
 void bpf_clear(void);
 #endif
-- 
1.8.3.4

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