| From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 09/37] perf bpf: Allow attaching BPF programs to modules symbols | Date | Thu, 19 Nov 2015 14:52:55 -0300 |
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From: Wang Nan <wangnan0@huawei.com>
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> --- 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 84169d6f2585..d0f02ed93804 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 -- 2.1.0
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