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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BE328C31E5E for ; Wed, 19 Jun 2019 08:49:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9517120823 for ; Wed, 19 Jun 2019 08:49:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731372AbfFSItG (ORCPT ); Wed, 19 Jun 2019 04:49:06 -0400 Received: from foss.arm.com ([217.140.110.172]:56290 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730418AbfFSItF (ORCPT ); Wed, 19 Jun 2019 04:49:05 -0400 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 4D821CFC; Wed, 19 Jun 2019 01:49:05 -0700 (PDT) Received: from [10.1.196.93] (en101.cambridge.arm.com [10.1.196.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7EFD43F246; Wed, 19 Jun 2019 01:49:04 -0700 (PDT) Subject: Re: Coresight causes synchronous external abort on msm8916 To: stephan@gerhold.net, agross@kernel.org, david.brown@linaro.org, mathieu.poirier@linaro.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20190618202623.GA53651@gerhold.net> From: Suzuki K Poulose Message-ID: Date: Wed, 19 Jun 2019 09:49:03 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190618202623.GA53651@gerhold.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Hi Stephan, On 18/06/2019 21:26, Stephan Gerhold wrote: > Hi, > > I'm trying to run mainline Linux on a smartphone with MSM8916 SoC. > It works surprisingly well, but the coresight devices seem to cause the > following crash shortly after userspace starts: > > Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP ... > > In this case I'm using a simple device tree similar to apq8016-sbc, > but it also happens using something as simple as msm8916-mtp.dts > on this particular device. > (Attached: dmesg log with msm8916-mtp.dts and arm64 defconfig) > > I can avoid the crash and boot without any further problems by disabling > every coresight device defined in msm8916.dtsi, e.g.: > > tpiu@820000 { status = "disabled"; }; ... > > I don't have any use for coresight at the moment, > but it seems somewhat odd to put this in the device specific dts. > > Any idea what could be causing this crash? This is mostly due to the missing power domain support. The CoreSight components are usually in a debug power domain. So unless that is turned on, (either by specifying proper power domain ids for power management protocol supported by the firmware OR via other hacks - e.g, connecting a DS-5 to keep the debug power domain turned on , this works on Juno -). > I'm not sure if this is a device-specific issue or possibly some kind of > configuration problem. > Or is this feature only working on development boards? Cheers Suzuki