Commit 5dbd16c0 authored Nov 16, 2015 by Wang Nan Committed by Arnaldo Carvalho de Melo Nov 18, 2015

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@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
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/1447675815-166222-5-git-send-email-wangnan0@huawei.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 361f2b1d

tools/perf/util/bpf-loader.c

+16 −0

Original line number	Original line	Diff line number	Diff line
	@@ -119,6 +119,16 @@ config__exec(const char value, struct perf_probe_event pev)
	return 0;		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 {		static struct {
	const char *key;		const char *key;
	const char *usage;		const char *usage;
	@@ -131,6 +141,12 @@ static struct {
	.desc = "Set uprobe target",		.desc = "Set uprobe target",
	.func = config__exec,		.func = config__exec,
	},		},
			{
			.key = "module",
			.usage = "module=<module name> ",
			.desc = "Set kprobe module",
			.func = config__module,
			}
	};		};

	static int		static int