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bpf: Add show_fdinfo for kprobe_multi

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Show kprobe_multi link info with fdinfo, the info as follows:

link_type:	kprobe_multi
link_id:	1
prog_tag:	a69740b9746f7da8
prog_id:	21
kprobe_cnt:	8
missed:	0
cookie	 func
1	 bpf_fentry_test1+0x0/0x20
7	 bpf_fentry_test2+0x0/0x20
2	 bpf_fentry_test3+0x0/0x20
3	 bpf_fentry_test4+0x0/0x20
4	 bpf_fentry_test5+0x0/0x20
5	 bpf_fentry_test6+0x0/0x20
6	 bpf_fentry_test7+0x0/0x20
8	 bpf_fentry_test8+0x0/0x10

Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Link: https://lore.kernel.org/r/20250702153958.639852-3-chen.dylane@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tao Chen
2025-07-02 23:39:58 +08:00
committed by Alexei Starovoitov
parent b4dfe26fbf
commit da7e9c0a7f
1 changed files with 27 additions and 0 deletions
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27
kernel/trace/bpf_trace.c
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@@ -2619,10 +2619,37 @@ 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,
"kprobe_cnt:\t%u\n"
"missed:\t%lu\n",
kmulti_link->cnt,
kmulti_link->fp.nmissed);
seq_printf(seq, "%s\t %s\n", "cookie", "func");
for (int i = 0; i < kmulti_link->cnt; i++) {
seq_printf(seq,
"%llu\t %pS\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)