linux-kernel - Re: [REGRESSION next-20170426] Commit 09515ef5ddad ("of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices") causes oops in mvneta

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Message-ID: <fa9a9c9b-68e5-251c-b640-6af5b1b3ce68@codeaurora.org>
Date:   Fri, 28 Apr 2017 18:48:33 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Ralph Sennhauser <ralph.sennhauser@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Joerg Roedel <jroedel@...e.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        netdev@...r.kernel.org
Subject: Re: [REGRESSION next-20170426] Commit 09515ef5ddad ("of/acpi:
 Configure dma operations at probe time for platform/amba/pci bus devices")
 causes oops in mvneta

Hi Ralph,

On 4/28/2017 5:55 PM, Ralph Sennhauser wrote:
> On Fri, 28 Apr 2017 17:26:41 +0530
> Sricharan R <sricharan@...eaurora.org> wrote:
> 
>> Hi Ralph,
>>
>> <snip..>
>>
>>>>>>>
>>>>>>> Commit 09515ef5ddad ("of/acpi: Configure dma operations at probe
>>>>>>> time for platform/amba/pci bus devices") causes a kernel panic
>>>>>>> as in the log below on an armada-385. Reverting the commit
>>>>>>> fixes the issue.
>>>>>>>
>>>>>>> Regards
>>>>>>> Ralph      
>>>>>>
>>>>>> Somehow not getting a obvious clue on whats going wrong with the
>>>>>> logs below. From the log and looking in to dts, the drivers seems
>>>>>> to the one for "marvell,armada-370-neta".    
>>>>>
>>>>> Correct.
>>>>>     
>>>>>> Issue looks the data from the dma
>>>>>> has gone bad and subsequently referring the wrong data has
>>>>>> resulted in the crash. Looks like the dma_masks is the one going
>>>>>> wrong. Can i get some logs from mvneta_probe, about
>>>>>> dev->dma_mask, dev->coherent_dma_mask and dev->dma_ops with and
>>>>>> without the patch to see whats the difference ?    
>>>>>
>>>>> Not sure I understood what exactly you are after. Might be faster
>>>>> to just send me a patch with all debug print statements you like
>>>>> to see.   
>>>>
>>>> Attached the patch with debug prints.
>>>>
>>>> Regards,
>>>>  Sricharan
>>>>  
>>>
>>> Hi Sricharan
>>>
>>> With commit 09515ef5ddad
>>>
>>> [    1.288962] mvneta f1070000.ethernet: dev->dma_mask 0xffffffff
>>> [    1.294827] mvneta f1070000.ethernet: dev->coherent_dma_mask
>>> 0xffffffff [    1.301472] mvneta f1070000.ethernet: dev->dma_ops
>>> 0x40b00c0601460
>>>
>>> [    1.322047] mvneta f1034000.ethernet: dev->dma_mask 0xffffffff
>>> [    1.327904] mvneta f1034000.ethernet: dev->coherent_dma_mask
>>> 0xffffffff [    1.334549] mvneta f1034000.ethernet: dev->dma_ops
>>> 0x40b00c0601460
>>>
>>>
>>> With the patch reverted, the build that works
>>>
>>> [    1.289001] mvneta f1070000.ethernet: dev->dma_mask 0xffffffff
>>> [    1.294866] mvneta f1070000.ethernet: dev->coherent_dma_mask
>>> 0xffffffff [    1.301511] mvneta f1070000.ethernet: dev->dma_ops
>>> 0x40b00c06014a8
>>>
>>> [    1.317005] mvneta f1034000.ethernet: dev->dma_mask 0xffffffff
>>> [    1.322867] mvneta f1034000.ethernet: dev->coherent_dma_mask
>>> 0xffffffff [    1.329508] mvneta f1034000.ethernet: dev->dma_ops
>>> 0x40b00c06014a8 
>>
>> My bad, i think it is this patch missing [1], attached it as well.
>> Infact, this was in the series initially and got acked to get merged
>> separately well before the series. I should have sent this to Russell.
>> I will do this now. If this fixes up the issue,
>> i will take this patch separately, while this series gets tested
>> on -next.
>>
>> [1] https://patchwork.kernel.org/patch/9362113/
>>
> 
> With the attached patch,
> 0001-arm-dma-mapping-Don-t-override-dma_ops-in-arch_setup.patch, on top
> of next all is well again.

Thanks for the testing.
Also, probably this patch now going through the iommu tree looks more apt,
as its for probe-deferral.
Joerg, is that correct ?

Regards,
 Sricharan


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