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bpf: Add show_fdinfo for uprobe_multi

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

link_type:	uprobe_multi
link_id:	9
prog_tag:	e729f789e34a8eca
prog_id:	39
uprobe_cnt:	3
pid:	0
path:	/home/dylane/bpf/tools/testing/selftests/bpf/test_progs
cookie	 offset	 ref_ctr_offset
3	 0xa69f13	 0x0
1	 0xa69f1e	 0x0
2	 0xa69f29	 0x0

Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Link: https://lore.kernel.org/r/20250702153958.639852-2-chen.dylane@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tao Chen 2025-07-02 23:39:57 +08:00 • committed by Alexei Starovoitov
parent 803f0700a3
commit b4dfe26fbf
1 changed files with 44 additions and 0 deletions
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44
kernel/trace/bpf_trace.c
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@ -3152,10 +3152,54 @@ static int bpf_uprobe_multi_link_fill_link_info(const struct bpf_link *link,
return err;
}
#ifdef CONFIG_PROC_FS
static void bpf_uprobe_multi_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
struct bpf_uprobe_multi_link *umulti_link;
char *p, *buf;
pid_t pid;
umulti_link = container_of(link, struct bpf_uprobe_multi_link, link);
buf = kmalloc(PATH_MAX, GFP_KERNEL);
if (!buf)
return;
p = d_path(&umulti_link->path, buf, PATH_MAX);
if (IS_ERR(p)) {
kfree(buf);
return;
}
pid = umulti_link->task ?
task_pid_nr_ns(umulti_link->task, task_active_pid_ns(current)) : 0;
seq_printf(seq,
"uprobe_cnt:\t%u\n"
"pid:\t%u\n"
"path:\t%s\n",
umulti_link->cnt, pid, p);
seq_printf(seq, "%s\t %s\t %s\n", "cookie", "offset", "ref_ctr_offset");
for (int i = 0; i < umulti_link->cnt; i++) {
seq_printf(seq,
"%llu\t %#llx\t %#lx\n",
umulti_link->uprobes[i].cookie,
umulti_link->uprobes[i].offset,
umulti_link->uprobes[i].ref_ctr_offset);
}
kfree(buf);
}
#endif
static const struct bpf_link_ops bpf_uprobe_multi_link_lops = {
.release = bpf_uprobe_multi_link_release,
.dealloc_deferred = bpf_uprobe_multi_link_dealloc,
.fill_link_info = bpf_uprobe_multi_link_fill_link_info,
#ifdef CONFIG_PROC_FS
.show_fdinfo = bpf_uprobe_multi_show_fdinfo,
#endif
};
static int uprobe_prog_run(struct bpf_uprobe *uprobe,