Show kprobe_multi link info with fdinfo, the info as follows: link_type: kprobe_multi link_id: 1 prog_tag: a15b7646cb7f3322 prog_id: 21 type: kprobe_multi kprobe_cnt: 8 missed: 0 cookie func 8 bpf_fentry_test1+0x0/0x20 2 bpf_fentry_test2+0x0/0x20 7 bpf_fentry_test3+0x0/0x20 6 bpf_fentry_test4+0x0/0x20 5 bpf_fentry_test5+0x0/0x20 4 bpf_fentry_test6+0x0/0x20 3 bpf_fentry_test7+0x0/0x20 1 bpf_fentry_test8+0x0/0x10
Signed-off-by: Tao Chen <[email protected]> --- kernel/trace/bpf_trace.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 2d422f897ac..99a1044b294 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2623,10 +2623,40 @@ static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link, return err; } +#ifdef CONFIG_PROC_FS +static void bpf_kprobe_multi_show_fdinfo(const struct bpf_link *link, + struct seq_file *seq) +{ + struct bpf_kprobe_multi_link *kmulti_link; + + kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); + + seq_printf(seq, + "type:\t%s\n" + "kprobe_cnt:\t%u\n" + "missed:\t%lu\n", + kmulti_link->flags == BPF_F_KPROBE_MULTI_RETURN ? "kretprobe_multi" : + "kprobe_multi", + kmulti_link->cnt, + kmulti_link->fp.nmissed); + + seq_printf(seq, "%-16s %-16s\n", "cookie", "func"); + for (int i = 0; i < kmulti_link->cnt; i++) { + seq_printf(seq, + "%-16llu %-16pS\n", + kmulti_link->cookies[i], + (void *)kmulti_link->addrs[i]); + } +} +#endif + static const struct bpf_link_ops bpf_kprobe_multi_link_lops = { .release = bpf_kprobe_multi_link_release, .dealloc_deferred = bpf_kprobe_multi_link_dealloc, .fill_link_info = bpf_kprobe_multi_link_fill_link_info, +#ifdef CONFIG_PROC_FS + .show_fdinfo = bpf_kprobe_multi_show_fdinfo, +#endif }; static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void *priv) -- 2.48.1
