From patchwork Tue Nov 17 15:31:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaldo Carvalho de Melo X-Patchwork-Id: 56806 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp2010921lbb; Tue, 17 Nov 2015 07:35:54 -0800 (PST) X-Received: by 10.66.157.9 with SMTP id wi9mr23486305pab.98.1447774553853; Tue, 17 Nov 2015 07:35:53 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id wz5si58234499pab.68.2015.11.17.07.35.52; Tue, 17 Nov 2015 07:35:53 -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 S1754352AbbKQPfb (ORCPT + 28 others); Tue, 17 Nov 2015 10:35:31 -0500 Received: from casper.infradead.org ([85.118.1.10]:36687 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753976AbbKQPbr (ORCPT ); Tue, 17 Nov 2015 10:31:47 -0500 Received: from [2804:14d:1285:110c:213:3bff:fe74:11bc] (helo=zoo.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZyiEP-0003HI-66; Tue, 17 Nov 2015 15:31:41 +0000 Received: by zoo.infradead.org (Postfix, from userid 1000) id 5F7A32201D1; Tue, 17 Nov 2015 12:31:35 -0300 (BRT) From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Wang Nan , Alexei Starovoitov , Masami Hiramatsu , Zefan Li , pi3orama@163.com, Arnaldo Carvalho de Melo Subject: [PATCH 04/16] perf bpf: Add BPF_PROLOGUE config options for further patches Date: Tue, 17 Nov 2015 12:31:19 -0300 Message-Id: <1447774291-14532-5-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1447774291-14532-1-git-send-email-acme@kernel.org> References: <1447774291-14532-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wang Nan If both LIBBPF and DWARF are detected, it is possible to create prologue for eBPF programs to help them access kernel data. HAVE_BPF_PROLOGUE and CONFIG_BPF_PROLOGUE are 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 that 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: Masami Hiramatsu Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1447675815-166222-9-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/config/Makefile | 12 ++++++++++++ 1 file changed, 12 insertions(+) -- 2.1.0 -- 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 de89ec574361..6eb9a956a408 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