linux-kernel - [tip:perf/core] perf bpf: Allow attaching BPF programs to modules symbols

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Message-ID: <tip-5dbd16c0c9d17ab1ab2226a5926482c26c0287ed@git.kernel.org>
Date:	Mon, 23 Nov 2015 08:06:36 -0800
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	xiakaixu@...wei.com, jolsa@...nel.org, brendan.d.gregg@...il.com,
	a.p.zijlstra@...llo.nl, dsahern@...il.com, hekuang@...wei.com,
	namhyung@...nel.org, acme@...hat.com, ast@...nel.org,
	daniel@...earbox.net, mingo@...nel.org, hpa@...or.com,
	masami.hiramatsu.pt@...achi.com, lizefan@...wei.com,
	tglx@...utronix.de
Subject: [tip:perf/core] perf bpf:
  Allow attaching BPF programs to modules symbols

Commit-ID:  5dbd16c0c9d17ab1ab2226a5926482c26c0287ed
Gitweb:     http://git.kernel.org/tip/5dbd16c0c9d17ab1ab2226a5926482c26c0287ed
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Mon, 16 Nov 2015 12:10:06 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 18 Nov 2015 17:51:03 -0300

perf bpf: Allow attaching BPF programs to modules symbols

By extending the syntax of BPF object section names, this patch allows
users to attach BPF programs to symbols in modules. For example:

  SEC("module=i915;"
      "parse_cmds=i915_parse_cmds")
  int parse_cmds(void *ctx)
  {
      return 1;
  }

The implementation is very simple: like what 'perf probe' does, for module,
fill 'uprobe' field in 'struct perf_probe_event'. Other parts will be done
automatically.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: David Ahern <dsahern@...il.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kaixu Xia <xiakaixu@...wei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1447675815-166222-5-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/bpf-loader.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 84169d6..d0f02ed 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -119,6 +119,16 @@ config__exec(const char *value, struct perf_probe_event *pev)
 	return 0;
 }
 
+static int
+config__module(const char *value, struct perf_probe_event *pev)
+{
+	pev->uprobes = false;
+	pev->target = strdup(value);
+	if (!pev->target)
+		return -ENOMEM;
+	return 0;
+}
+
 static struct {
 	const char *key;
 	const char *usage;
@@ -131,6 +141,12 @@ static struct {
 		.desc	= "Set uprobe target",
 		.func	= config__exec,
 	},
+	{
+		.key	= "module",
+		.usage	= "module=<module name>    ",
+		.desc	= "Set kprobe module",
+		.func	= config__module,
+	}
 };
 
 static int
--
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