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	Diff line number	Diff line
		@@ -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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