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bpf: Add show_fdinfo for perf_event

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After commit 1b715e1b0e ("bpf: Support ->fill_link_info for perf_event") add
perf_event info, we can also show the info with the method of cat /proc/[fd]/fdinfo.

kprobe fdinfo:
link_type:	perf
link_id:	10
prog_tag:	bcf7977d3b93787c
prog_id:	20
name:	bpf_fentry_test1
offset:	0x0
missed:	0
addr:	0xffffffffa28a2904
event_type:	kprobe
cookie:	3735928559

uprobe fdinfo:
link_type:	perf
link_id:	13
prog_tag:	bcf7977d3b93787c
prog_id:	21
name:	/proc/self/exe
offset:	0x63dce4
ref_ctr_offset:	0x33eee2a
event_type:	uprobe
cookie:	3735928559

tracepoint fdinfo:
link_type:	perf
link_id:	11
prog_tag:	bcf7977d3b93787c
prog_id:	22
tp_name:	sched_switch
event_type:	tracepoint
cookie:	3735928559

perf_event fdinfo:
link_type:	perf
link_id:	12
prog_tag:	bcf7977d3b93787c
prog_id:	23
type:	1
config:	2
event_type:	event
cookie:	3735928559

Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250606150258.3385166-1-chen.dylane@linux.dev
This commit is contained in:
Tao Chen
2025-06-06 23:02:58 +08:00
committed by Andrii Nakryiko
parent 4d2815a1cc
commit 97ebac5886
1 changed files with 120 additions and 0 deletions
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120
kernel/bpf/syscall.c
View File

@@ -3795,6 +3795,32 @@ static int bpf_perf_link_fill_kprobe(const struct perf_event *event,
info->perf_event.kprobe.cookie = event->bpf_cookie;
return 0;
}
static void bpf_perf_link_fdinfo_kprobe(const struct perf_event *event,
struct seq_file *seq)
{
const char *name;
int err;
u32 prog_id, type;
u64 offset, addr;
unsigned long missed;
err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
&offset, &addr, &missed);
if (err)
return;
seq_printf(seq,
"name:\t%s\n"
"offset:\t%#llx\n"
"missed:\t%lu\n"
"addr:\t%#llx\n"
"event_type:\t%s\n"
"cookie:\t%llu\n",
name, offset, missed, addr,
type == BPF_FD_TYPE_KRETPROBE ? "kretprobe" : "kprobe",
event->bpf_cookie);
}
#endif
#ifdef CONFIG_UPROBE_EVENTS
@@ -3823,6 +3849,31 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
info->perf_event.uprobe.ref_ctr_offset = ref_ctr_offset;
return 0;
}
static void bpf_perf_link_fdinfo_uprobe(const struct perf_event *event,
struct seq_file *seq)
{
const char *name;
int err;
u32 prog_id, type;
u64 offset, ref_ctr_offset;
unsigned long missed;
err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
&offset, &ref_ctr_offset, &missed);
if (err)
return;
seq_printf(seq,
"name:\t%s\n"
"offset:\t%#llx\n"
"ref_ctr_offset:\t%#llx\n"
"event_type:\t%s\n"
"cookie:\t%llu\n",
name, offset, ref_ctr_offset,
type == BPF_FD_TYPE_URETPROBE ? "uretprobe" : "uprobe",
event->bpf_cookie);
}
#endif
static int bpf_perf_link_fill_probe(const struct perf_event *event,
@@ -3891,10 +3942,79 @@ static int bpf_perf_link_fill_link_info(const struct bpf_link *link,
}
}
static void bpf_perf_event_link_show_fdinfo(const struct perf_event *event,
struct seq_file *seq)
{
seq_printf(seq,
"type:\t%u\n"
"config:\t%llu\n"
"event_type:\t%s\n"
"cookie:\t%llu\n",
event->attr.type, event->attr.config,
"event", event->bpf_cookie);
}
static void bpf_tracepoint_link_show_fdinfo(const struct perf_event *event,
struct seq_file *seq)
{
int err;
const char *name;
u32 prog_id;
err = bpf_get_perf_event_info(event, &prog_id, NULL, &name, NULL,
NULL, NULL);
if (err)
return;
seq_printf(seq,
"tp_name:\t%s\n"
"event_type:\t%s\n"
"cookie:\t%llu\n",
name, "tracepoint", event->bpf_cookie);
}
static void bpf_probe_link_show_fdinfo(const struct perf_event *event,
struct seq_file *seq)
{
#ifdef CONFIG_KPROBE_EVENTS
if (event->tp_event->flags & TRACE_EVENT_FL_KPROBE)
return bpf_perf_link_fdinfo_kprobe(event, seq);
#endif
#ifdef CONFIG_UPROBE_EVENTS
if (event->tp_event->flags & TRACE_EVENT_FL_UPROBE)
return bpf_perf_link_fdinfo_uprobe(event, seq);
#endif
}
static void bpf_perf_link_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
struct bpf_perf_link *perf_link;
const struct perf_event *event;
perf_link = container_of(link, struct bpf_perf_link, link);
event = perf_get_event(perf_link->perf_file);
if (IS_ERR(event))
return;
switch (event->prog->type) {
case BPF_PROG_TYPE_PERF_EVENT:
return bpf_perf_event_link_show_fdinfo(event, seq);
case BPF_PROG_TYPE_TRACEPOINT:
return bpf_tracepoint_link_show_fdinfo(event, seq);
case BPF_PROG_TYPE_KPROBE:
return bpf_probe_link_show_fdinfo(event, seq);
default:
return;
}
}
static const struct bpf_link_ops bpf_perf_link_lops = {
.release = bpf_perf_link_release,
.dealloc = bpf_perf_link_dealloc,
.fill_link_info = bpf_perf_link_fill_link_info,
.show_fdinfo = bpf_perf_link_show_fdinfo,
};
static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)