Commit da7e9c0a authored by Tao Chen's avatar Tao Chen Committed by Alexei Starovoitov
Browse files

bpf: Add show_fdinfo for kprobe_multi 



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: default avatarTao Chen <chen.dylane@linux.dev>
Link: https://lore.kernel.org/r/20250702153958.639852-3-chen.dylane@linux.dev


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent b4dfe26f

kernel/trace/bpf_trace.c

+27 −0
Original line number Diff line number Diff line
@@ -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)