From patchwork Mon Dec 14 08:45:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Clark X-Patchwork-Id: 11971565 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 ECFC4C4361B for ; Mon, 14 Dec 2020 08:46:36 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 94B23207B0 for ; Mon, 14 Dec 2020 08:46:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 94B23207B0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=Qj4uBZachpTwaw6YzYC6b7xCJ28TO4WD0QhOExtJCFQ=; b=wDu0TZjliBz/a07v+GSCRf80TD 8ECZ96evRLB8wsxgeRqsokCi02gztnUMmiyVqfFPMVB1o+4lv51A1jO4ZuTs90FAmNWsHTQo6FL2/ iwc8lfiHS7od0Rt41NaZnBJWIrlPX9voWDal0L1pAafLMZK640zGmofvSh7riFLeTY2/I+C8YkAYU Kz7t7ysg+a2Oon6gqbomxdEFXOD9eDZCinO0ntJG103aXl2XsLKIzlv5OKPfM5opLi6mtux6VqMIC JcU6xjgWLuKWCfc0HHw/UVMZvJExozOKFuv5qClsKUSaMPS+19VnVGxO/bhIFMV7qRaHFcvce0oKd P5RSNyag==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kojTu-0007LX-LG; Mon, 14 Dec 2020 08:45:22 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kojTr-0007Kw-Pb for linux-arm-kernel@lists.infradead.org; Mon, 14 Dec 2020 08:45:20 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 97C6E1FB; Mon, 14 Dec 2020 00:45:16 -0800 (PST) Received: from e121896.arm.com (unknown [10.57.30.226]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CC4BC3F66E; Mon, 14 Dec 2020 00:45:13 -0800 (PST) From: James Clark To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, will@kernel.org, leo.yan@linaro.org Subject: [PATCH v2] drivers/perf: Enable PID_IN_CONTEXTIDR with SPE Date: Mon, 14 Dec 2020 10:45:02 +0200 Message-Id: <20201214084502.19954-1-james.clark@arm.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201214_034519_885254_839EE498 X-CRM114-Status: GOOD ( 14.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Al Grant , Mathieu Poirier , Suzuki K Poulose , Catalin Marinas , John Garry , James Clark Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Enable PID_IN_CONTEXTIDR by default when Arm SPE is enabled. This flag is required to get PID data in the SPE trace. Without it the perf tool will report 0 for PID which isn't very useful, especially when doing system wide profiling or profiling applications that fork. There is a small performance overhead when enabling PID_IN_CONTEXTIDR, but SPE itself is optional and not enabled by default so the impact is minimised. Cc: Will Deacon Cc: Mark Rutland Cc: Al Grant Cc: Leo Yan Cc: John Garry Cc: Suzuki K Poulose Cc: Mathieu Poirier Cc: Catalin Marinas Signed-off-by: James Clark --- arch/arm64/Kconfig.debug | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 265c4461031f..b030bb21a0bb 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -2,6 +2,7 @@ config PID_IN_CONTEXTIDR bool "Write the current PID to the CONTEXTIDR register" + default y if ARM_SPE_PMU help Enabling this option causes the kernel to write the current PID to the CONTEXTIDR register, at the expense of some additional