From patchwork Fri Nov 13 12:29:16 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 56510 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp1007912lbb; Fri, 13 Nov 2015 04:32:37 -0800 (PST) X-Received: by 10.68.87.4 with SMTP id t4mr31781468pbz.61.1447417957381; Fri, 13 Nov 2015 04:32:37 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id x6si25108185pas.13.2015.11.13.04.32.37; Fri, 13 Nov 2015 04:32:37 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754846AbbKMMce (ORCPT + 28 others); Fri, 13 Nov 2015 07:32:34 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:24732 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932737AbbKMMcb (ORCPT ); Fri, 13 Nov 2015 07:32:31 -0500 Received: from 172.24.1.47 (EHLO SZXEML423-HUB.china.huawei.com) ([172.24.1.47]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id BQY85715; Fri, 13 Nov 2015 20:29:48 +0800 (CST) Received: from linux-4hy3.site (10.107.193.248) by SZXEML423-HUB.china.huawei.com (10.82.67.154) with Microsoft SMTP Server id 14.3.235.1; Fri, 13 Nov 2015 20:29:38 +0800 From: Wang Nan To: , , CC: , , , Wang Nan , Arnaldo Carvalho de Melo Subject: [PATCH 07/12] perf tools: Add BPF_PROLOGUE config options for further patches Date: Fri, 13 Nov 2015 12:29:16 +0000 Message-ID: <1447417761-156094-8-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1447417761-156094-1-git-send-email-wangnan0@huawei.com> References: <1447417761-156094-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.5645D84D.01BA, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: f908092af117f22801541dc71e2dd123 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If both LIBBPF and DWARF are detected, it is possible to create prologue for eBPF programs to help them accessing kernel data. HAVE_BPF_PROLOGUE and CONFIG_BPF_PROLOGUE is added as flags for this feature. PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET is introduced in commit 63ab024a5b6f295ca17a293ad81b7c728f49a89a ("perf tools: regs_query_register_offset() infrastructure"), which indicates an architecture supports converting name of a register to its offset in 'struct pt_regs'. Without this support, BPF_PROLOGUE should be turned off. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Arnaldo Carvalho de Melo Cc: Masami Hiramatsu Cc: Zefan Li Cc: pi3orama@163.com --- tools/perf/config/Makefile | 12 ++++++++++++ 1 file changed, 12 insertions(+) -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile index de89ec5..6eb9a95 100644 --- a/tools/perf/config/Makefile +++ b/tools/perf/config/Makefile @@ -318,6 +318,18 @@ ifndef NO_LIBELF CFLAGS += -DHAVE_LIBBPF_SUPPORT $(call detected,CONFIG_LIBBPF) endif + + ifndef NO_DWARF + ifdef PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET + CFLAGS += -DHAVE_BPF_PROLOGUE + $(call detected,CONFIG_BPF_PROLOGUE) + else + msg := $(warning BPF prologue is not supported by architecture $(ARCH), missing regs_query_register_offset()); + endif + else + msg := $(warning DWARF support is off, BPF prologue is disabled); + endif + endif # NO_LIBBPF endif # NO_LIBELF