From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-178.mta1.migadu.com (out-178.mta1.migadu.com [95.215.58.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 99BEF227563 for ; Sun, 15 Jun 2025 15:06:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749999968; cv=none; b=m0WiXR82+NwGgEDLi3BmXx0ulnnf+7UeTlLLsHT3grQcMyHT2+Cg3OZZ8nNz35ikD0SHjGXJ8zJuA4rhwOeLAFq5/3ax5kRxaYZv03u1NuDsIUBX7jBqfXcdHcZ2ZQ7e/OevZzu2IckuRYe7fBa45VAS5xkT2FmXVSPWmDsbP/o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749999968; c=relaxed/simple; bh=xNIUWzj16PhCwrAXHyDoUIlgH6ClK+EeYkFEw9nwUiQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pOHU+42BHnGvzcrAz+wPK83zNc1yVh2OCvZrfLcc/MTWmbzxkH2MucbT9Px4uutUJPoCC1rRsvEt7pRXQWqrR3kUZ1A83hh1wOTkOkzKeAbHtrM9MvqTlh/bM8UVaVAKg5eFNW2dDc0UmjuuFWztYXkO7H6KV/X0F5GJfMEAEkg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=vQazZhLJ; arc=none smtp.client-ip=95.215.58.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="vQazZhLJ" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1749999961; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZnVXyo9YAc3mEYtp3xAGNvddXlHt2TT59D1agtzUoxA=; b=vQazZhLJpo4STKY9wkJFHJO2MiNtBKI+Y29cEkFtlRsHCC4Pye5+gYR+Qs/yQdNaq0MeM9 ypsDz2SGYBsN41f/SqcbGbXCpu2RhVIvjo4IdCKGo8F8ryY4M4GpIoiGj3r5D9C/0uQRK/ hJwaMy8+r/cTiaQWcQRTqFKjfJaswM8= From: Tao Chen To: song@kernel.org, jolsa@kernel.org, kpsingh@kernel.org, mattbobrowski@google.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, yonghong.song@linux.dev, john.fastabend@gmail.com, sdf@fomichev.me, haoluo@google.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Tao Chen Subject: [PATCH bpf-next v2 2/2] bpf: Add show_fdinfo for kprobe_multi Date: Sun, 15 Jun 2025 23:05:14 +0800 Message-ID: <20250615150514.418581-2-chen.dylane@linux.dev> In-Reply-To: <20250615150514.418581-1-chen.dylane@linux.dev> References: <20250615150514.418581-1-chen.dylane@linux.dev> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Show kprobe_multi link info with fdinfo, the info as follows: link_type: kprobe_multi link_id: 3 prog_tag: e8225cbcc9cdffef prog_id: 29 type: kprobe_multi kprobe_cnt: 8 missed: 0 func: bpf_fentry_test1+0x0/0x20 cookie: 1 func: bpf_fentry_test2+0x0/0x20 cookie: 7 func: bpf_fentry_test3+0x0/0x20 cookie: 2 func: bpf_fentry_test4+0x0/0x20 cookie: 3 func: bpf_fentry_test5+0x0/0x20 cookie: 4 func: bpf_fentry_test6+0x0/0x20 cookie: 5 func: bpf_fentry_test7+0x0/0x20 cookie: 6 func: bpf_fentry_test8+0x0/0x10 cookie: 8 Signed-off-by: Tao Chen --- kernel/trace/bpf_trace.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 9a8ca8a8e2b..d060c61e4e4 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2623,10 +2623,43 @@ 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; + char sym[KSYM_NAME_LEN]; + + kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); + + seq_printf(seq, + "type:\t%s\n" + "kprobe_cnt:\t%u\n" + "missed:\t%lu\n", + kmulti_link->flags == BPF_F_KPROBE_MULTI_RETURN ? "kretprobe_multi" : + "kprobe_multi", + kmulti_link->cnt, + kmulti_link->fp.nmissed); + + for (int i = 0; i < kmulti_link->cnt; i++) { + sprint_symbol(sym, kmulti_link->addrs[i]); + seq_printf(seq, + "func:\t%s\n" + "cookie:\t%llu\n", + sym, + kmulti_link->cookies[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) -- 2.48.1