Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752704AbbG1Qng (ORCPT ); Tue, 28 Jul 2015 12:43:36 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:33682 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752495AbbG1Qne (ORCPT ); Tue, 28 Jul 2015 12:43:34 -0400 MIME-Version: 1.0 In-Reply-To: References: <20150724224258.GA23990@google.com> From: Bjorn Helgaas Date: Tue, 28 Jul 2015 11:43:12 -0500 Message-ID: Subject: Re: X-Gene: Unhandled fault: synchronous external abort in pci_generic_config_read32 To: Duc Dang Cc: Tanmay Inamdar , "linux-pci@vger.kernel.org" , linux-arm , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2117 Lines: 46 On Fri, Jul 24, 2015 at 7:05 PM, Duc Dang wrote: > Hi Bjorn, > > On Fri, Jul 24, 2015 at 3:42 PM, Bjorn Helgaas wrote: >> >> I regularly see faults like this on an APM X-Gene: >> >> U-Boot 2013.04-mustang_sw_1.14.14 (Dec 16 2014 - 15:59:33) >> CPU0: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz >> 32 KB ICACHE, 32 KB DCACHE >> SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz >> ... >> Unhandled fault: synchronous external abort (0x96000010) at 0xffffff8000110034 >> Internal error: : 96000010 [#1] SMP >> Modules linked in: >> CPU: 0 PID: 3723 Comm: ... 4.1.0-smp-DEV #3 >> Hardware name: APM X-Gene Mustang board (DT) >> task: ffffffc7dc1a4140 ti: ffffffc7dc118000 task.ti: ffffffc7dc118000 >> PC is at pci_generic_config_read32+0x4c/0xb8 >> LR is at pci_generic_config_read32+0x40/0xb8 >> pc : [] lr : [] pstate: 600001c5 >> ... >> Call trace: >> [] pci_generic_config_read32+0x4c/0xb8 >> [] pci_user_read_config_byte+0x60/0xc4 >> [] pci_read_config+0x15c/0x238 >> [] sysfs_kf_bin_read+0x68/0xa0 >> [] kernfs_fop_read+0x9c/0x1ac >> [] __vfs_read+0x44/0x128 >> [] vfs_read+0x84/0x144 >> [] SyS_read+0x50/0xb0 > > The log shows kernel gets an exception when trying to access Mellanox > card configuration space. This is usually due to suboptimal PCIe > SerDes parameters are using in your board, which will cause bad link > quality. > The PCIe SerDes programming is done in U-Boot, so I suggest you do a > U-Boot upgrade to our latest X-Gene U-Boot release. I installed U-Boot 1.15.12, which I thought was the latest. I'm still seeing this issue regularly, approx once/hour. -- 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/