lkml.org 
[lkml]   [2015]   [Jul]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: X-Gene: Unhandled fault: synchronous external abort in pci_generic_config_read32
On Tue, Jul 28, 2015 at 9:43 AM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> On Fri, Jul 24, 2015 at 7:05 PM, Duc Dang <dhdang@apm.com> wrote:
>> Hi Bjorn,
>>
>> On Fri, Jul 24, 2015 at 3:42 PM, Bjorn Helgaas <bhelgaas@google.com> 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 : [<ffffffc00033b90c>] lr : [<ffffffc00033b900>] pstate: 600001c5
>>> ...
>>> Call trace:
>>> [<ffffffc00033b90c>] pci_generic_config_read32+0x4c/0xb8
>>> [<ffffffc00033bf58>] pci_user_read_config_byte+0x60/0xc4
>>> [<ffffffc0003496a8>] pci_read_config+0x15c/0x238
>>> [<ffffffc0002393b4>] sysfs_kf_bin_read+0x68/0xa0
>>> [<ffffffc00023896c>] kernfs_fop_read+0x9c/0x1ac
>>> [<ffffffc0001c361c>] __vfs_read+0x44/0x128
>>> [<ffffffc0001c3e28>] vfs_read+0x84/0x144
>>> [<ffffffc0001c4764>] 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.

Our latest U-Boot is 1.15.15, but U-Boot 1.15.12 is already a good
version to use. Are you running any PCIe traffic test when the error
happens? I will try to reproduce the issue with my Mustang board as
well.

And it will be useful if you can share your "lspci -vvv" output when
the board is running, we can check to see if there is any error status
reported.

--
Regards,
Duc Dang.


\
 
 \ /
  Last update: 2015-07-28 20:01    [W:0.150 / U:0.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site