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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 65899C00449 for ; Fri, 5 Oct 2018 17:31:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2CA4321473 for ; Fri, 5 Oct 2018 17:31:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="fcDDUumB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2CA4321473 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-pci-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727958AbeJFAba (ORCPT ); Fri, 5 Oct 2018 20:31:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:50914 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727941AbeJFAba (ORCPT ); Fri, 5 Oct 2018 20:31:30 -0400 Received: from localhost (unknown [69.71.4.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 51763213A2; Fri, 5 Oct 2018 17:31:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1538760707; bh=yjr3rJd5n7kwy89yTMmB1oPgrPRMWhCND6814p+FZUs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=fcDDUumB+qUsKyf0KYt3azj1S4oq8+T96BrmhwuNVFLlnEMB9O8WOs2GjpT0hkoKU PGQErqzpAAUzEHKWCjzzQf7hoJGHYtc9UVUnoNyBtazFkO3gBXOo3wL1ZRjqNDCcvx U3shgFYeZ6jllzmhgzk79s5W5EHDUnaNfpL1msCA= Date: Fri, 5 Oct 2018 12:31:45 -0500 From: Bjorn Helgaas To: Keith Busch Cc: Linux PCI , Bjorn Helgaas , Benjamin Herrenschmidt , Sinan Kaya , Thomas Tai , poza@codeaurora.org, Lukas Wunner , Christoph Hellwig , Mika Westerberg , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 00/12] error handling and pciehp maintenance Message-ID: <20181005173145.GL120535@bhelgaas-glaptop.roam.corp.google.com> References: <20180918235848.26694-1-keith.busch@intel.com> <20181004214015.GK120535@bhelgaas-glaptop.roam.corp.google.com> <20181004221137.GB21834@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181004221137.GB21834@localhost.localdomain> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org [+cc arm64 folks, LKML: This conversation is about this patch: https://lore.kernel.org/linux-pci/20180918235848.26694-3-keith.busch@intel.com which fixes some PCIe AER error injection bugs, but also makes the error injector dependent on DYNAMIC_FTRACE_WITH_REGS, which not all arches support. Note that this question is only about the error *injection* module used for testing. It doesn't affect AER support itself.] On Thu, Oct 04, 2018 at 04:11:37PM -0600, Keith Busch wrote: > On Thu, Oct 04, 2018 at 04:40:15PM -0500, Bjorn Helgaas wrote: > > On Tue, Sep 18, 2018 at 05:58:36PM -0600, Keith Busch wrote: > > > I ran into a lot of trouble testing error handling, and this series is > > > just trying to simplify some things. The first 4 fix up aer_inject, and > > > the rest are cleanup to make better use of kernel APIs. > > > > > > Keith Busch (12): > > > PCI: Set PCI bus accessors to noinline > > > PCI/AER: Covertly inject errors > > > PCI/AER: Reuse existing service device lookup > > > PCI/AER: Abstract AER interrupt handling > > > PCI/AER: Remove dead code > > > PCI/AER: Remove error source from aer struct > > > PCI/AER: Use kfifo for tracking events > > > PCI/AER: Use kfifo helper inserting locked elements > > > PCI/AER: Don't read upstream ports below fatal errors > > > PCI/AER: Use threaded IRQ for bottom half > > > PCI/AER: Use managed resource allocations > > > PCI/pciehp: Use device managed allocations > > > > > > drivers/pci/access.c | 4 +- > > > drivers/pci/hotplug/pciehp_core.c | 14 +- > > > drivers/pci/hotplug/pciehp_hpc.c | 48 ++---- > > > drivers/pci/pcie/Kconfig | 2 +- > > > drivers/pci/pcie/aer.c | 219 ++++++--------------------- > > > drivers/pci/pcie/aer_inject.c | 306 ++++++++++++++++++++------------------ > > > drivers/pci/pcie/portdrv.h | 4 - > > > drivers/pci/pcie/portdrv_core.c | 1 + > > > 8 files changed, 227 insertions(+), 371 deletions(-) > > > > Thanks a lot for doing this! I applied these to pci/hotplug for > > v4.20, except for "PCI/AER: Don't read upstream ports below fatal > > errors", which seems to be already there via another posting, and > > "PCI/pciehp: Use device managed allocations", which needs a few > > tweaks. > > Sounds good, and thanks for applying! > > In case this went unnoticed, patch 2's aer_inject using ftrace hooks > to pci config accessors is really cool and fixes several kernel crashes > I encountered, but it may not work on every architecture. I'm not sure > how widely aer_inject is used, so maybe there are no concerns with the > DYNAMIC_FTRACE_WITH_REGS dependency, but I just want to reemphasize that > dependency in case there are valid objections. Oh, indeed, I hadn't noticed this arch dependency. AFAICT, the new DYNAMIC_FTRACE_WITH_REGS dependency means aer_inject will work only on these arches: arm # if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 && MMU powerpc # if PPC64 && CPU_LITTLE_ENDIAN riscv # ARCH_RV64I only s390 x86 Notably missing is arm64, which has DYNAMIC_FTRACE but not DYNAMIC_FTRACE_WITH_REGS. Bjorn