linux-kernel - Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel

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Message-ID: <56748D85.4060108@candw.ms>
Date:	Fri, 18 Dec 2015 18:49:41 -0400
From:	Julian Margetson <runaway@...dw.ms>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find
 dma channel

On 12/18/2015 6:33 PM, Måns Rullgård wrote:
> Julian Margetson <runaway@...dw.ms> writes:
>
>> On 12/18/2015 1:18 PM, Måns Rullgård wrote:
>>> Julian Margetson <runaway@...dw.ms> writes:
>>>
>>>> On 12/18/2015 8:49 AM, Måns Rullgård wrote:
>>>>> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> writes:
>>>>>
>>>>>>>> [    5.206125] Unable to handle kernel paging request for data at
>>>>>>>> address 0x00000000
>>>>>>>> [    5.228546] Faulting instruction address: 0xc043a2c8
>>>>>>>> [    5.248577] Vector: 300 (Data Access) at [eddafae0]
>>>>>>>> [    5.268658]     pc: c043a2c8: sata_dwc_qc_issue+0xb8/0x204
>>>>>>> Well, that's not good.  Can you translate that address to a line of
>>>>>>> code?
>>>>>> Besides that, can you enable DYNAMIC_DEBUG in the config and append
>>>>>> 'dw_dmac_core.dyndbg dw_dmac.dyndbg' to the kernel cmdline?
>>>>> Enabling debug messages in the sata_dwc driver might also be informative.
>>>>>
>>>> Changed the sata-dwc to a module .
>>>>
>>>> [   18.475140] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL
>>>> [   18.535698] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL
>>> That's strange.  The only way that can happen is if
>>> dmaengine_prep_slave_sg() return NULL, and that really shouldn't be
>>> happening.  Did you turn on debug messages in dw_dma?  You can enable
>>> some extra debug messages by adding "#define VERBOSE_DEBUG" at the top
>>> of drivers/dma/dw/core.c
>>>
>> [   17.526173] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL
>> [   17.600124] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL
>> [   17.662978] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: dma_dwc_xfer_setup returns NULL
> Could you post the entire kernel log?  There might be important
> information before the errors start.
>


View attachment "Kernel_Log.log" of type "text/plain" (176672 bytes)