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perf bpf: Allow attaching BPF programs to modules symbols

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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>
This commit is contained in:
Wang Nan 2015-11-16 12:10:06 +00:00 committed by Arnaldo Carvalho de Melo
parent 361f2b1d1d
commit 5dbd16c0c9
1 changed files with 16 additions and 0 deletions
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16
tools/perf/util/bpf-loader.c
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@ -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