Show kprobe_multi link info with fdinfo, the info as follows:
link_type: kprobe_multi
link_id: 4
prog_tag: 279dd9c09dfbc757
prog_id: 30
type: kprobe_multi
func_cnt: 8
missed: 0
addr: 0xffffffff81ecb1e0
cookie: 8
addr: 0xffffffff81eccb70
cookie: 2
addr: 0xffffffff81eccba0
cookie: 7
addr: 0xffffffff81eccbd0
cookie: 6
addr: 0xffffffff81eccc00
cookie: 5
addr: 0xffffffff81eccc30
cookie: 4
addr: 0xffffffff81eccc60
cookie: 3
addr: 0xffffffff81eccc90
cookie: 1
Signed-off-by: Tao Chen <chen.dyl...@linux.dev>
---
kernel/trace/bpf_trace.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index c4ad82b8fd8..6c3ffa3c1ca 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2623,10 +2623,41 @@ 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"
+ "func_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);
+
+ for (int i = 0; i < kmulti_link->cnt; i++) {
+ seq_printf(seq,
+ "addr:\t%#lx\n"
+ "cookie:\t%llu\n",
+ kmulti_link->addrs[i],
+ kmulti_link->cookies[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
