Re: [PATCH 0/8] fsldma: lockup fixes

[Felix Radensky <felix@embedded-sol.com>]

Hi Ira,

On 03/01/2011 02:21 AM, Ira W. Snyder wrote:
> On Mon, Feb 28, 2011 at 11:27:40PM +0200, Felix Radensky wrote:
>> Hi Ira,
>>
>> On 02/28/2011 11:11 PM, Ira W. Snyder wrote:
>>> On Mon, Feb 28, 2011 at 10:15:49PM +0200, Felix Radensky wrote:
>>>> Hi Ira,
>>>>
>>>>> Thank you very much Felix. The dmesg output shows that the controller
>>>>> never got an interrupt for the second transaction. The patch below has
>>>>> extra debugging information that may help determine why this happens.
>>>>> Please apply it and re-run the test.
>>>>>
>>>>> The last section of dmesg (after "Freeing unused kernel memory") is all
>>>>> I need.
>>>>>
>>>> Attached relevant dmesg portion.
>>>>
>>> Ok, try this patch on top of the last one.
>>>
>>> It looks like you used the dmatest module in multi-channel mode last
>>> time. One channel makes it easier to debug:
>>>
>>> modprobe dmatest max_channels=1 threads_per_chan=2 iterations=1
>>>
>>> Thanks for your help in debugging this. Hopefully this is the last
>>> patch to test. :)
>>>
>>> Ira
>>>
>> Looks like this was not the last one. The test still fails, see below
>>
>  From this log, it looks like the DMA controller is not generating an
> interrupt after the second chain is started. The first chain is finished
> before the second thread runs and starts its chain.
>
> The end-of-segments interrupt is completely missing. The part is not
> behaving as the datasheet explains it should. Are you sure you applied
> the patch and rebuilt the kernel? (Just checking to be sure. I'm very
> appreciative of the amount of help you've given me debugging this!)

I've double checked and I'm sure I've applied your patch and rebuilt
the kernel.
> Can you run this for me:
>
> modprobe dmatest max_channels=1 threads_per_chan=1 iterations=4
>
> Thanks again,
> Ira

See below.

__dma_request_channel: success (dma0chan0)
dmatest: Started 1 threads using dma0chan0
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7000 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7060 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a70c0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7120 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7180 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a71e0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7240 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a72a0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7300 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7360 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a73c0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7420 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7480 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a74e0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: start=0
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: end=14
of:fsl-elo-dma ffe0c300.dma: chan0: idle, starting controller
of:fsl-elo-dma ffe0c300.dma: chan0: irq: stat = 0x8
of:fsl-elo-dma ffe0c300.dma: chan0: irq: End-of-link INT
of:fsl-elo-dma ffe0c300.dma: chan0: irq: Exit
of:fsl-elo-dma ffe0c300.dma: chan0: tasklet entry
of:fsl-elo-dma ffe0c300.dma: chan0: completed_cookie=14
of:fsl-elo-dma ffe0c300.dma: chan0: no pending LDs
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7000 callback
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7000 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7060 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a70c0 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7120 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7180 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a71e0 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7240 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a72a0 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7300 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7360 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a73c0 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7420 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7480 free
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a74e0 free
of:fsl-elo-dma ffe0c300.dma: chan0: tasklet exit
dma0chan0-copy0: verifying source buffer...
dma0chan0-copy0: verifying dest buffer...
dma0chan0-copy0: #0: No errors with src_off=0x43e dst_off=0x3a5 len=0x3605
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a74e0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7480 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: start=14
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: end=16
of:fsl-elo-dma ffe0c300.dma: chan0: idle, starting controller
dma0chan0-copy0: #1: test timed out
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7420 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a73c0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7360 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7300 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: start=16
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: end=20
of:fsl-elo-dma ffe0c300.dma: chan0: DMA controller still busy
dma0chan0-copy0: #2: test timed out
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a72a0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7240 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a71e0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7180 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7120 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a70c0 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: LD ef3a7060 allocated
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: start=20
of:fsl-elo-dma ffe0c300.dma: chan0: assign cookies: end=27
of:fsl-elo-dma ffe0c300.dma: chan0: DMA controller still busy
dma0chan0-copy0: #3: test timed out
dma0chan0-copy0: terminating after 4 tests, 3 failures (status 0)

Felix.