From patchwork Wed Jun 28 11:53:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13295630 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97B91EB64D7 for ; Wed, 28 Jun 2023 11:54:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231464AbjF1Lx6 (ORCPT ); Wed, 28 Jun 2023 07:53:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231521AbjF1Lxt (ORCPT ); Wed, 28 Jun 2023 07:53:49 -0400 Received: from mail-oo1-xc35.google.com (mail-oo1-xc35.google.com [IPv6:2607:f8b0:4864:20::c35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6107630C4; Wed, 28 Jun 2023 04:53:48 -0700 (PDT) Received: by mail-oo1-xc35.google.com with SMTP id 006d021491bc7-560c617c820so3963958eaf.3; Wed, 28 Jun 2023 04:53:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687953227; x=1690545227; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=+JRogB97bxWoJfOW0CfNRh76/adLfjmSnF+g9dS4Ezc=; b=GnusNgABpuKY8gpdEbEsu3Us8MDTvBk2f0DYbBID8edgmy0bAOYEkinU3Ofqo4xvi5 Dl0MQt+3HQzJlx7ECrC69z7hDs9mv2fP34tLUYmbJ4h0kHF7C7tXjAdLCV0vfV1TDHn/ RQBZ4u7T47WZm5WxVuko3uBjhmwKCTxYXkW0OYEEeQfFswtKUrT0sEj5Gdl5jNkhCvB8 jRDjDuQo/u/WuhXNXCteaGmNjgu+u0ih7KYbvvJLdy5LtolDKIECgeAYkeVmyHYvd8v/ fdrT/TuzZRbbiYVQuNsGvndVwd+9jcmxT2VvJ07FhXozFw+LSLwx36Begj0Jq6rQWICx B4zw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687953227; x=1690545227; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+JRogB97bxWoJfOW0CfNRh76/adLfjmSnF+g9dS4Ezc=; b=H6+bHjekecfIQ+prBl7m/n8rczvRYFKN4/SXDjh8yKyao7xYsi3CCK4KobS7jvAIwi piURGqU/6sqc7zmtiWEFwqygq9nKRwiyWF06f08nxH4D9rKnweOT1i2eE4z/oKrvlpJK DEPCYSXXqDEShT+cXF7/G9qOhRCa/WsaEaz6Y9LWyzqSjbpR12hqJJAwdUHDdGVet/0Q mnaplNNW/72D2NgtvXhXdNeF2kAsf3VtarCFoJL+gH5BC5jNNH42zyHh/uhLA+8U2wp2 YsfioEmVfPPAKOSzNQeR6Lz0sxub63flJQPJAD07ClVee56GdK6J6D035bidkDDqnZ8r 9gig== X-Gm-Message-State: AC+VfDxU0jgmk54yGER44ttfEmCqj9SFkG2GFribIIWuhQ6bH0vFXtT4 RNuzVix6sG6qfsyKPDr9G/Q= X-Google-Smtp-Source: ACHHUZ5Rzw2tWyuJVQyziP8V98yhwN/0tWukiwZG8B06140BjuwfXQurN5KkrxoPkFlfM4rQenFyFg== X-Received: by 2002:a05:6808:120a:b0:39e:b985:b47e with SMTP id a10-20020a056808120a00b0039eb985b47emr40633682oil.36.1687953227630; Wed, 28 Jun 2023 04:53:47 -0700 (PDT) Received: from vultr.guest ([2001:19f0:ac02:b79:5400:4ff:fe7d:3e26]) by smtp.gmail.com with ESMTPSA id n91-20020a17090a5ae400b002471deb13fcsm8000504pji.6.2023.06.28.04.53.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jun 2023 04:53:47 -0700 (PDT) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, quentin@isovalent.com, rostedt@goodmis.org, mhiramat@kernel.org Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v6 bpf-next 08/11] bpf: Add bpf_perf_link_fill_common() Date: Wed, 28 Jun 2023 11:53:26 +0000 Message-Id: <20230628115329.248450-9-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230628115329.248450-1-laoar.shao@gmail.com> References: <20230628115329.248450-1-laoar.shao@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Add a new helper bpf_perf_link_fill_common(), which will be used by perf_link based tracepoint, kprobe and uprobe. Signed-off-by: Yafang Shao --- kernel/bpf/syscall.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 4aa6e5776a04..72de91beabbc 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3364,6 +3364,40 @@ static void bpf_perf_link_dealloc(struct bpf_link *link) kfree(perf_link); } +static int bpf_perf_link_fill_common(const struct perf_event *event, + char __user *uname, u32 ulen, + u64 *probe_offset, u64 *probe_addr, + u32 *fd_type) +{ + const char *buf; + u32 prog_id; + size_t len; + int err; + + if (!ulen ^ !uname) + return -EINVAL; + if (!uname) + return 0; + + err = bpf_get_perf_event_info(event, &prog_id, fd_type, &buf, + probe_offset, probe_addr); + if (err) + return err; + + len = strlen(buf); + if (buf) { + err = bpf_copy_to_user(uname, buf, ulen, len); + if (err) + return err; + } else { + char zero = '\0'; + + if (put_user(zero, uname)) + return -EFAULT; + } + return 0; +} + static const struct bpf_link_ops bpf_perf_link_lops = { .release = bpf_perf_link_release, .dealloc = bpf_perf_link_dealloc,