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Date:   Fri, 22 Apr 2022 13:55:52 -0700
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To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Robert Jarzmik <robert.jarzmik@free.fr>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Arnd Bergmann <arnd@arndb.de>, Daniel Mack <daniel@zonque.org>,
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From:   Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support
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On 4/22/22 12:16, Arnd Bergmann wrote:
> On Fri, Apr 22, 2022 at 7:05 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On Tue, Apr 19, 2022 at 06:37:22PM +0200, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>>
>>> This revisits a series I sent a few years ago:
>>>
>>> https://lore.kernel.org/lkml/20191018154052.1276506-1-arnd@arndb.de/
>>>
>>> All the other ARMv5 conversions are under way now, with
>>> OMAP1 being the only one still not in linux-next yet,
>>> and PXA completing the set.
>>>
>>> Most of the patches are unchanged from before, furtunately
>>> the PXA code is fairly stable. I addressed Robert's comments,
>>> pulled in two patches from Dmitry, and added the last a the
>>> final four patches to finish off the multiplatform conversion.
>>>
>>> I hope someone is left to test these on PXA: if this works,
>>> I'd like to merge it for 5.19. A git tree with these is avaialable
>>> for testing at
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/log/?h=pxa-multiplatform-5.18
>>>
>>
>> Unfortunately that crashes for me when trying to boot from ide.
>> Bisect points to the last patch of the series.
> 
> Thanks a lot for testing and the perfect bug report!
> 
>> [    1.403715] 8<--- cut here ---
>> [    1.403848] Unable to handle kernel paging request at virtual address feeb000e
>> [    1.404097] [feeb000e] *pgd=00000000
> 
> Ok, this is the PCI I/O space area, which starts at 0xfee00000,
> clearly the way I/O space
> gets mapped changed here. I don't yet see what happened, but it should
> be straightforward
> to find from here.
> 
>> [    1.416643]  pcmcia_init_one from pcmcia_device_probe+0xe4/0x2a0
>> [    1.416882]  pcmcia_device_probe from really_probe+0xc8/0x3b4
>> [    1.417070]  really_probe from __driver_probe_device+0x9c/0x214
>> [    1.417255]  __driver_probe_device from driver_probe_device+0x38/0xe0
>> [    1.417454]  driver_probe_device from __device_attach_driver+0xa4/0x11c
>> [    1.417657]  __device_attach_driver from bus_for_each_drv+0x88/0xd8
>> [    1.417864]  bus_for_each_drv from __device_attach+0xf4/0x194
>> [    1.418047]  __device_attach from bus_probe_device+0x8c/0x94
>> [    1.418224]  bus_probe_device from device_add+0x3d0/0x894
>> [    1.418395]  device_add from pcmcia_device_add+0x2ec/0x3e0
>> [    1.418568]  pcmcia_device_add from pcmcia_card_add+0xd4/0x1a0
>> [    1.418756]  pcmcia_card_add from pcmcia_bus_add+0x44/0x4c
>> [    1.418930]  pcmcia_bus_add from socket_insert+0x12c/0x150
>> [    1.419103]  socket_insert from pccardd+0x398/0x44c
>> [    1.419257]  pccardd from kthread+0xdc/0x114
>> [    1.419400]  kthread from ret_from_fork+0x14/0x2c
>> [    1.419569] Exception stack(0xc48a5fb0 to 0xc48a5ff8)
>> [    1.419735] 5fa0:                                     00000000 00000000 00000000 00000000
>> [    1.419979] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> [    1.420222] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>> [    1.420501] Code: 13570000 e1a06000 0a000043 e3a03002 (e5c03000)
>> [    1.420874] ---[ end trace 0000000000000000 ]---
>>
>> ---
>> # bad: [7643a9ca9f8e08f71e15f89dd74863635e981e03] ARM: pxa: convert to multiplatform
>> # good: [3123109284176b1532874591f7c81f3837bbdc17] Linux 5.18-rc1
>> git bisect start 'HEAD' 'v5.18-rc1'
>> # good: [9b03d7f95bd4d97101ecb8ea1e822103b81fdb2d] ARM: pxa: mainstone-wm97xx: use gpio lookup table
>> git bisect good 9b03d7f95bd4d97101ecb8ea1e822103b81fdb2d
>> # good: [764063eee7620ea9abb940068a7ad0e7f9efa1b6] cpufreq: pxa3: move clk register access to clk driver
>> git bisect good 764063eee7620ea9abb940068a7ad0e7f9efa1b6
>> # good: [5153474f0a4388b7ddb59add4be73bfb42b2007f] ARM: mmp: remove tavorevb board support
>> git bisect good 5153474f0a4388b7ddb59add4be73bfb42b2007f
>> # good: [2746f7c78b428c8b01b691a29a972c08101ae343] ARM: PXA: fix multi-cpu build of xsc3
>> git bisect good 2746f7c78b428c8b01b691a29a972c08101ae343
>> # good: [73d5106e9489464eac84362705e93bcf3b376123] ARM: pxa: remove support for MTD_XIP
>> git bisect good 73d5106e9489464eac84362705e93bcf3b376123
>> # first bad commit: [7643a9ca9f8e08f71e15f89dd74863635e981e03] ARM: pxa: convert to multiplatform
> 
> I'll back out this patch for now while investigating further.
> 
> Which machine did you hit this on? Is this on hardware or in qemu?
> 
qemu, as always. borzoi, spitz, terrier, tosa, z2, and sx1 fail.
Also, I just noticed that the failure is not always the same.
z2 fails to boot from initrd, and sx1 fails to boot completely.
I'll do another round of bisects.

Guenter

>         Arnd