diff options
| author | Tao Chen <chen.dylane@linux.dev> | 2025-07-02 23:39:57 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-07-03 19:29:42 -0700 |
| commit | b4dfe26fbf56f7b3e50764268e14b73f1632bfc0 (patch) | |
| tree | 963d2fc1bdaeecb0653b9514a944661d7d16e6c3 /kernel/trace/bpf_trace.c | |
| parent | 803f0700a3bbf528c4c624a22f87d08178ca0fbe (diff) | |
bpf: Add show_fdinfo for uprobe_multi
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>
Diffstat (limited to 'kernel/trace/bpf_trace.c')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 81d7a4e5ae15..b2737642c42a 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -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, |