From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC971C3F68F for ; Sat, 18 Jan 2020 13:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 942512469C for ; Sat, 18 Jan 2020 13:50:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579355405; bh=BkHrbqMvATjGDN+G2h5meMJxbkbptjKyqhj/oKSVFUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=j9ehR2Qr7uTRRXBMM9nyn7urY0gcoorG1JstI+FiQ91w9Bbfzd36OK/cWxuHb2dib 00HImdaXvDaa4df1fI+RRRoXH2XaM6NjcjsM6GlNFxSU6waT7+cSw3moy8cUF4k/RG ecOtPK/0n9//yVhEnLtg1WkazoDPkeh10iCatpH8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726597AbgARNuF convert rfc822-to-8bit (ORCPT ); Sat, 18 Jan 2020 08:50:05 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:43660 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726119AbgARNuE (ORCPT ); Sat, 18 Jan 2020 08:50:04 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-285-Aj1X2p8SPjKVPRXwf3niLw-1; Sat, 18 Jan 2020 08:50:00 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AB74A184C725; Sat, 18 Jan 2020 13:49:58 +0000 (UTC) Received: from krava.redhat.com (ovpn-204-18.brq.redhat.com [10.40.204.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E6AB84BC9; Sat, 18 Jan 2020 13:49:54 +0000 (UTC) From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Andrii Nakryiko , Yonghong Song , Martin KaFai Lau , Jakub Kicinski , David Miller , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Subject: [PATCH 2/6] bpf: Add bpf_perf_event_output_kfunc Date: Sat, 18 Jan 2020 14:49:41 +0100 Message-Id: <20200118134945.493811-3-jolsa@kernel.org> In-Reply-To: <20200118134945.493811-1-jolsa@kernel.org> References: <20200118134945.493811-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: Aj1X2p8SPjKVPRXwf3niLw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Adding support to use perf_event_output in BPF_TRACE_FENTRY/BPF_TRACE_FEXIT programs. Using nesting regs array from raw tracepoint helpers. Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 41 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 19e793aa441a..6a18e2ae6e30 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1172,6 +1172,43 @@ raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) } } +BPF_CALL_5(bpf_perf_event_output_kfunc, void *, ctx, struct bpf_map *, map, + u64, flags, void *, data, u64, size) +{ + struct pt_regs *regs = get_bpf_raw_tp_regs(); + int ret; + + if (IS_ERR(regs)) + return PTR_ERR(regs); + + perf_fetch_caller_regs(regs); + ret = ____bpf_perf_event_output(regs, map, flags, data, size); + put_bpf_raw_tp_regs(); + return ret; +} + +static const struct bpf_func_proto bpf_perf_event_output_proto_kfunc = { + .func = bpf_perf_event_output_kfunc, + .gpl_only = true, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_CONST_MAP_PTR, + .arg3_type = ARG_ANYTHING, + .arg4_type = ARG_PTR_TO_MEM, + .arg5_type = ARG_CONST_SIZE_OR_ZERO, +}; + +static const struct bpf_func_proto * +kfunc_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) +{ + switch (func_id) { + case BPF_FUNC_perf_event_output: + return &bpf_perf_event_output_proto_kfunc; + default: + return tracing_func_proto(func_id, prog); + } +} + static const struct bpf_func_proto * tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -1181,6 +1218,10 @@ tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_skb_output_proto; #endif default: + if (prog->expected_attach_type == BPF_TRACE_FENTRY || + prog->expected_attach_type == BPF_TRACE_FEXIT) + return kfunc_prog_func_proto(func_id, prog); + return raw_tp_prog_func_proto(func_id, prog); } } -- 2.24.1