* [PATCH bpf-next] bpf: Add show_fdinfo for perf_event
@ 2025-06-04 16:37 Tao Chen
2025-06-05 18:41 ` Andrii Nakryiko
2025-06-05 21:53 ` Jiri Olsa
0 siblings, 2 replies; 5+ messages in thread
From: Tao Chen @ 2025-06-04 16:37 UTC (permalink / raw)
To: ast, daniel, john.fastabend, andrii, martin.lau, eddyz87, song,
yonghong.song, kpsingh, sdf, haoluo, jolsa
Cc: bpf, linux-kernel, Tao Chen
After commit 1b715e1b0ec5 ("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: 2
prog_tag: bcf7977d3b93787c
prog_id: 18
name: bpf_fentry_test1
offset: 0
missed: 0
addr: ffffffffaea8d134
event_type: 3
cookie: 3735928559
uprobe fdinfo:
link_type: perf
link_id: 6
prog_tag: bcf7977d3b93787c
prog_id: 7
name: /proc/self/exe
offset: 6507541
event_type: 1
cookie: 3735928559
tracepoint fdinfo:
link_type: perf
link_id: 4
prog_tag: bcf7977d3b93787c
prog_id: 8
tp_name: sched_switch
event_type: 5
cookie: 3735928559
perf_event fdinfo:
link_type: perf
link_id: 5
prog_tag: bcf7977d3b93787c
prog_id: 9
type: 1
config: 2
event_type: 6
cookie: 3735928559
Signed-off-by: Tao Chen <chen.dylane@linux.dev>
---
kernel/bpf/syscall.c | 126 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 126 insertions(+)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 9794446bc8..9af54852eb 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -3793,6 +3793,35 @@ 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;
+
+ if (type == BPF_FD_TYPE_KRETPROBE)
+ type = BPF_PERF_EVENT_KRETPROBE;
+ else
+ type = BPF_PERF_EVENT_KPROBE;
+
+ seq_printf(seq,
+ "name:\t%s\n"
+ "offset:\t%llu\n"
+ "missed:\t%lu\n"
+ "addr:\t%llx\n"
+ "event_type:\t%u\n"
+ "cookie:\t%llu\n",
+ name, offset, missed, addr, type, event->bpf_cookie);
+}
#endif
#ifdef CONFIG_UPROBE_EVENTS
@@ -3820,6 +3849,34 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
info->perf_event.uprobe.cookie = event->bpf_cookie;
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, addr;
+ unsigned long missed;
+
+ err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
+ &offset, &addr, &missed);
+ if (err)
+ return;
+
+ if (type == BPF_FD_TYPE_URETPROBE)
+ type = BPF_PERF_EVENT_URETPROBE;
+ else
+ type = BPF_PERF_EVENT_UPROBE;
+
+ seq_printf(seq,
+ "name:\t%s\n"
+ "offset:\t%llu\n"
+ "event_type:\t%u\n"
+ "cookie:\t%llu\n",
+ name, offset, type, event->bpf_cookie);
+
+}
#endif
static int bpf_perf_link_fill_probe(const struct perf_event *event,
@@ -3888,10 +3945,79 @@ 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%u\n"
+ "cookie:\t%llu\n",
+ event->attr.type, event->attr.config,
+ BPF_PERF_EVENT_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%u\n"
+ "cookie:\t%llu\n",
+ name, BPF_PERF_EVENT_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)
--
2.43.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next] bpf: Add show_fdinfo for perf_event
2025-06-04 16:37 [PATCH bpf-next] bpf: Add show_fdinfo for perf_event Tao Chen
@ 2025-06-05 18:41 ` Andrii Nakryiko
2025-06-06 2:36 ` Tao Chen
2025-06-05 21:53 ` Jiri Olsa
1 sibling, 1 reply; 5+ messages in thread
From: Andrii Nakryiko @ 2025-06-05 18:41 UTC (permalink / raw)
To: Tao Chen
Cc: ast, daniel, john.fastabend, andrii, martin.lau, eddyz87, song,
yonghong.song, kpsingh, sdf, haoluo, jolsa, bpf, linux-kernel
On Wed, Jun 4, 2025 at 9:37 AM Tao Chen <chen.dylane@linux.dev> wrote:
>
> After commit 1b715e1b0ec5 ("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: 2
> prog_tag: bcf7977d3b93787c
> prog_id: 18
> name: bpf_fentry_test1
> offset: 0
> missed: 0
> addr: ffffffffaea8d134
> event_type: 3
> cookie: 3735928559
>
> uprobe fdinfo:
> link_type: perf
> link_id: 6
> prog_tag: bcf7977d3b93787c
> prog_id: 7
> name: /proc/self/exe
> offset: 6507541
> event_type: 1
> cookie: 3735928559
>
> tracepoint fdinfo:
> link_type: perf
> link_id: 4
> prog_tag: bcf7977d3b93787c
> prog_id: 8
> tp_name: sched_switch
> event_type: 5
> cookie: 3735928559
>
> perf_event fdinfo:
> link_type: perf
> link_id: 5
> prog_tag: bcf7977d3b93787c
> prog_id: 9
> type: 1
> config: 2
> event_type: 6
> cookie: 3735928559
>
> Signed-off-by: Tao Chen <chen.dylane@linux.dev>
> ---
> kernel/bpf/syscall.c | 126 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 126 insertions(+)
>
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index 9794446bc8..9af54852eb 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -3793,6 +3793,35 @@ 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;
> +
> + if (type == BPF_FD_TYPE_KRETPROBE)
> + type = BPF_PERF_EVENT_KRETPROBE;
> + else
> + type = BPF_PERF_EVENT_KPROBE;
maybe use "kretprobe" and "kprobe" strings?
> +
> + seq_printf(seq,
> + "name:\t%s\n"
> + "offset:\t%llu\n"
llx, hex makes most sense (we had similar discussion within the
context of bpftool reporting)
pw-bot: cr
> + "missed:\t%lu\n"
> + "addr:\t%llx\n"
ditto, address -> hex
> + "event_type:\t%u\n"
> + "cookie:\t%llu\n",
> + name, offset, missed, addr, type, event->bpf_cookie);
> +}
> #endif
>
> #ifdef CONFIG_UPROBE_EVENTS
> @@ -3820,6 +3849,34 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
> info->perf_event.uprobe.cookie = event->bpf_cookie;
> 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, addr;
> + unsigned long missed;
> +
> + err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
> + &offset, &addr, &missed);
> + if (err)
> + return;
> +
> + if (type == BPF_FD_TYPE_URETPROBE)
> + type = BPF_PERF_EVENT_URETPROBE;
> + else
> + type = BPF_PERF_EVENT_UPROBE;
strings, just as above
> +
> + seq_printf(seq,
> + "name:\t%s\n"
> + "offset:\t%llu\n"
hex
> + "event_type:\t%u\n"
> + "cookie:\t%llu\n",
> + name, offset, type, event->bpf_cookie);
> +
> +}
> #endif
>
> static int bpf_perf_link_fill_probe(const struct perf_event *event,
> @@ -3888,10 +3945,79 @@ 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%u\n"
string?
> + "cookie:\t%llu\n",
> + event->attr.type, event->attr.config,
> + BPF_PERF_EVENT_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%u\n"
string
> + "cookie:\t%llu\n",
> + name, BPF_PERF_EVENT_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)
> --
> 2.43.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next] bpf: Add show_fdinfo for perf_event
2025-06-04 16:37 [PATCH bpf-next] bpf: Add show_fdinfo for perf_event Tao Chen
2025-06-05 18:41 ` Andrii Nakryiko
@ 2025-06-05 21:53 ` Jiri Olsa
2025-06-06 2:31 ` Tao Chen
1 sibling, 1 reply; 5+ messages in thread
From: Jiri Olsa @ 2025-06-05 21:53 UTC (permalink / raw)
To: Tao Chen
Cc: ast, daniel, john.fastabend, andrii, martin.lau, eddyz87, song,
yonghong.song, kpsingh, sdf, haoluo, bpf, linux-kernel
On Thu, Jun 05, 2025 at 12:37:22AM +0800, Tao Chen wrote:
SNIP
> +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, addr;
> + unsigned long missed;
> +
> + err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
> + &offset, &addr, &missed);
hi,
addr now gets ref_ctr_offset:
823153334042 bpf: Add support to retrieve ref_ctr_offset for uprobe perf link
so let's display that
thanks,
jirka
> + if (err)
> + return;
> +
> + if (type == BPF_FD_TYPE_URETPROBE)
> + type = BPF_PERF_EVENT_URETPROBE;
> + else
> + type = BPF_PERF_EVENT_UPROBE;
> +
> + seq_printf(seq,
> + "name:\t%s\n"
> + "offset:\t%llu\n"
> + "event_type:\t%u\n"
> + "cookie:\t%llu\n",
> + name, offset, type, event->bpf_cookie);
> +
> +}
> #endif
>
SNIP
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next] bpf: Add show_fdinfo for perf_event
2025-06-05 21:53 ` Jiri Olsa
@ 2025-06-06 2:31 ` Tao Chen
0 siblings, 0 replies; 5+ messages in thread
From: Tao Chen @ 2025-06-06 2:31 UTC (permalink / raw)
To: Jiri Olsa
Cc: ast, daniel, john.fastabend, andrii, martin.lau, eddyz87, song,
yonghong.song, kpsingh, sdf, haoluo, bpf, linux-kernel
在 2025/6/6 05:53, Jiri Olsa 写道:
> On Thu, Jun 05, 2025 at 12:37:22AM +0800, Tao Chen wrote:
>
> SNIP
>
>> +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, addr;
>> + unsigned long missed;
>> +
>> + err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
>> + &offset, &addr, &missed);
>
> hi,
> addr now gets ref_ctr_offset:
> 823153334042 bpf: Add support to retrieve ref_ctr_offset for uprobe perf link
>
> so let's display that
>
will add it in v2, thanks.
> thanks,
> jirka
>
>
>
>> + if (err)
>> + return;
>> +
>> + if (type == BPF_FD_TYPE_URETPROBE)
>> + type = BPF_PERF_EVENT_URETPROBE;
>> + else
>> + type = BPF_PERF_EVENT_UPROBE;
>> +
>> + seq_printf(seq,
>> + "name:\t%s\n"
>> + "offset:\t%llu\n"
>> + "event_type:\t%u\n"
>> + "cookie:\t%llu\n",
>> + name, offset, type, event->bpf_cookie);
>> +
>> +}
>> #endif
>>
>
> SNIP
--
Best Regards
Tao Chen
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next] bpf: Add show_fdinfo for perf_event
2025-06-05 18:41 ` Andrii Nakryiko
@ 2025-06-06 2:36 ` Tao Chen
0 siblings, 0 replies; 5+ messages in thread
From: Tao Chen @ 2025-06-06 2:36 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: ast, daniel, john.fastabend, andrii, martin.lau, eddyz87, song,
yonghong.song, kpsingh, sdf, haoluo, jolsa, bpf, linux-kernel
在 2025/6/6 02:41, Andrii Nakryiko 写道:
> On Wed, Jun 4, 2025 at 9:37 AM Tao Chen <chen.dylane@linux.dev> wrote:
>>
>> After commit 1b715e1b0ec5 ("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: 2
>> prog_tag: bcf7977d3b93787c
>> prog_id: 18
>> name: bpf_fentry_test1
>> offset: 0
>> missed: 0
>> addr: ffffffffaea8d134
>> event_type: 3
>> cookie: 3735928559
>>
>> uprobe fdinfo:
>> link_type: perf
>> link_id: 6
>> prog_tag: bcf7977d3b93787c
>> prog_id: 7
>> name: /proc/self/exe
>> offset: 6507541
>> event_type: 1
>> cookie: 3735928559
>>
>> tracepoint fdinfo:
>> link_type: perf
>> link_id: 4
>> prog_tag: bcf7977d3b93787c
>> prog_id: 8
>> tp_name: sched_switch
>> event_type: 5
>> cookie: 3735928559
>>
>> perf_event fdinfo:
>> link_type: perf
>> link_id: 5
>> prog_tag: bcf7977d3b93787c
>> prog_id: 9
>> type: 1
>> config: 2
>> event_type: 6
>> cookie: 3735928559
>>
>> Signed-off-by: Tao Chen <chen.dylane@linux.dev>
>> ---
>> kernel/bpf/syscall.c | 126 +++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 126 insertions(+)
>>
>> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
>> index 9794446bc8..9af54852eb 100644
>> --- a/kernel/bpf/syscall.c
>> +++ b/kernel/bpf/syscall.c
>> @@ -3793,6 +3793,35 @@ 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;
>> +
>> + if (type == BPF_FD_TYPE_KRETPROBE)
>> + type = BPF_PERF_EVENT_KRETPROBE;
>> + else
>> + type = BPF_PERF_EVENT_KPROBE;
>
> maybe use "kretprobe" and "kprobe" strings?
>
It looks more readable, i will change it in v2, thanks.
>> +
>> + seq_printf(seq,
>> + "name:\t%s\n"
>> + "offset:\t%llu\n"
>
> llx, hex makes most sense (we had similar discussion within the
> context of bpftool reporting)
>
> pw-bot: cr
>
>> + "missed:\t%lu\n"
>> + "addr:\t%llx\n"
>
> ditto, address -> hex
>
will change it in v2, thanks.
>> + "event_type:\t%u\n"
>> + "cookie:\t%llu\n",
>> + name, offset, missed, addr, type, event->bpf_cookie);
>> +}
>> #endif
>>
>> #ifdef CONFIG_UPROBE_EVENTS
>> @@ -3820,6 +3849,34 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
>> info->perf_event.uprobe.cookie = event->bpf_cookie;
>> 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, addr;
>> + unsigned long missed;
>> +
>> + err = bpf_get_perf_event_info(event, &prog_id, &type, &name,
>> + &offset, &addr, &missed);
>> + if (err)
>> + return;
>> +
>> + if (type == BPF_FD_TYPE_URETPROBE)
>> + type = BPF_PERF_EVENT_URETPROBE;
>> + else
>> + type = BPF_PERF_EVENT_UPROBE;
>
> strings, just as above
>
get it.
>> +
>> + seq_printf(seq,
>> + "name:\t%s\n"
>> + "offset:\t%llu\n"
>
> hex
get it.
>
>> + "event_type:\t%u\n"
>> + "cookie:\t%llu\n",
>> + name, offset, type, event->bpf_cookie);
>> +
>> +}
>> #endif
>>
>> static int bpf_perf_link_fill_probe(const struct perf_event *event,
>> @@ -3888,10 +3945,79 @@ 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%u\n"
>
> string?
>
sure.
>> + "cookie:\t%llu\n",
>> + event->attr.type, event->attr.config,
>> + BPF_PERF_EVENT_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%u\n"
>
> string
>
get it.
>> + "cookie:\t%llu\n",
>> + name, BPF_PERF_EVENT_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)
>> --
>> 2.43.0
>>
--
Best Regards
Tao Chen
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2025-06-06 2:36 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-06-04 16:37 [PATCH bpf-next] bpf: Add show_fdinfo for perf_event Tao Chen
2025-06-05 18:41 ` Andrii Nakryiko
2025-06-06 2:36 ` Tao Chen
2025-06-05 21:53 ` Jiri Olsa
2025-06-06 2:31 ` Tao Chen
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