Coresight ETF trace dump failed in Juno r1 with 4.8-rc8

[Venkatesh Vivekanandan]

On Wed, Oct 5, 2016 at 4:12 PM, Sudeep Holla <sudeep.holla at arm.com> wrote:
>
> On 05/10/16 06:27, Venkatesh Vivekanandan wrote:
>
> [...]
>
>
>>
>> Hang is seen while trying to dump trace _after_ disabling the ETM
>> source. Is it not supposed to work?.
>> It works fine, when dumped before disabling ETM source. Please find
>> the log below.
>>
>> linaro-test [rc=0]# echo 1 > 20010000.etf/enable_sink
>> linaro-test [rc=0]# echo 1 > 22140000.etm/enable_source
>> [   91.792145] coresight-tmc 20010000.etf: TMC-ETB/ETF enabled
>> [   91.797719] coresight-funnel 20040000.main-funnel: FUNNEL inport 0
>> enabled
>> [   91.804552] coresight-funnel 220c0000.cluster0-funnel: FUNNEL
>> inport 1 enabled
>> [   91.815990] coresight-etm4x 22140000.etm: ETM tracing enabled
>> linaro-test [rc=0]# dd if=/dev/20010000.etf of=/cstrace.bin bs=1
>> [  108.105492] coresight-tmc 20010000.etf: TMC read start
>> [  108.404335] coresight-tmc 20010000.etf: TMC read end
>> 65536+0 records in
>> 65536+0 records out
>> linaro-test [rc=0]# echo 0 > 20010000.etf/enable_sink
>> linaro-test [rc=0]# dd if=/dev/20010000.etf of=/cstrace.bin bs=1
>> [  125.069740] coresight-tmc 20010000.etf: TMC read start
>> [  125.184370] coresight-tmc 20010000.etf: TMC read end
>> 65536+0 records in
>> 65536+0 records out
>> linaro-test [rc=0]# echo 0 > 22140000.etm/enable_source
>> [  140.271163] coresight-etm4x 22140000.etm: ETM tracing disabled
>> [  140.276964] coresight-funnel 220c0000.cluster0-funnel: FUNNEL
>> inport 1 disabled
>> [  140.284211] coresight-funnel 20040000.main-funnel: FUNNEL inport 0
>> disabled
>> [  140.291128] coresight-tmc 20010000.etf: TMC-ETB/ETF disabled
>> linaro-test [rc=0]# dd if=/dev/20010000.etf of=/cstrace.bin bs=1
>> <---- It hangs here...
>>
>
> I get dd: failed to open '/dev/20010000.etf': Invalid argument
> once all the data is read.
>
It hangs in my board.

>> My firmware version,
>>
>> NOTICE:  Booting Trusted Firmware
>> NOTICE:  BL1: v1.1(debug):4a1dcde
>> NOTICE:  BL1: Built : 17:54:40, Nov 24 2015
>> NOTICE:  BL1: Booting BL2
>> NOTICE:  BL2: v1.1(debug):4a1dcde
>> NOTICE:  BL2: Built : 17:54:40, Nov 24 2015
>> NOTICE:  BL1: Booting BL3-1
>> NOTICE:  BL3-1: v1.1(debug):4a1dcde
>> NOTICE:  BL3-1: Built : 17:54:40, Nov 24 2015
>> UEFI firmware (version 9ed6f7e built at 17:54:28 on Nov 24 2015)
>>
>
> OK, this looks as good as what Suzuki has, so should be fine.
> But it doesn't list SCP version, can you see that from the Linux boot
> logs ?(something like below)
>
> "scpi_protocol scpi: SCP Protocol 1.2 Firmware 1.17.0 version"

[    2.537096] scpi_protocol scpi: SCP Protocol 1.0 Firmware 1.11.0 version

>
> --
> Regards,
> Sudeep