Re: Some question about OpenCSD coresight drive usage

Good day,

First and foremost, for coresight related questions please CC the coresight mailing list. There is a lot of knowledgeable people on it that can help with your questions.

On 29 March 2017 at 04:09, Kaiyou Wang Kaiyou.Wang@arm.com wrote:

Hi Mathieu,

I have find the root cause about the issue, thanks

Another questions,

1> I port the coresight dts config from JUNO-busybox to JUNO-android, but the cpu hung during the kernel boot stage, do you have any suggestion?

The first thing to do would be to disable coresight. If the board still hangs there is not much I can do for you. Otherwise there is either a problem with power domains or the clocks. You will likely have to instrument the kernel to see where things hang.

2> I try to use the sysFS attribute of Coresight to trace data, but decode the data failed by the OpenCSD,

The interesting question here is how did you try to use the OpenCSD library to decode traces acquired via sysFS? OpenCSD requires a lot of trace configuration information that is not present in raw sysFS traces. The integration between coresight and perf is an example of how those trace configuration information need to be communicated to the library.

Is there any introduction of Coresight sysFS usage? And Can perf decode the raw trace data?

No - perf can't decode raw traces gathered from sysFS for reasons mentionned above.

Regards, Mathieu

thanks

From: Kaiyou Wang Sent: Wednesday, March 29, 2017 10:02 AM To: 'mathieu.poirier@linaro.org' Subject: Some question about OpenCSD coresight drive usage

Hi Mathieu,

Sorry to disturb, I have some question about the coresight driver usage, could you give me some suggestion?

I try to perf recode the trace event on JUNO busybox platform:

/ # ./perf record -e cs_etm/@20010000.etf/ --per-thread uname

map_groups__set_modules_path_dir: cannot open /lib/modules/4.9.0-dirty dir

Problems setting modules path maps, continuing anyway...

path: /sys/bus/coresight/devices/20010000.etf/enable_sink

mmap size 528384B

[ 2257.038441] coresight-funnel 20040000.main-funnel: FUNNEL inport 1 enabled

[ 2257.045268] coresight-funnel 230c0000.cluster1-funnel: FUNNEL inport 3 enabled

Linux

[ 2257.055129] coresight-funnel 230c0000.cluster1-funnel: FUNNEL inport 3 disabled

[ 2257.062376] coresight-funnel 20040000.main-funnel: FUNNEL inport 1 disabled

[ 2257.069277] coresight-tmc 20010000.etf: TMC-ETB/ETF disabled

[ perf record: Woken up 1 times to write data ]

failed to write feature 8

failed to write feature 9

failed to write feature 14

[ perf record: Captured and wrote 0.041 MB perf.data ]

Then try to decode the perf.data on host-linux, but it faild, could you give me some suggestion?

kaiwan01@sha-swtool:~/code/OpenCSD/trace-data$ cat disasm.sh

#!/bin/bash

export EXEC_PATH=/home/kaiwan01/code/OpenCSD/OpenCSD-perf/perf-opencsd-4.8/tools/perf/

export SCRIPT_PATH=$EXEC_PATH/scripts/python/

export XTOOL_PATH=/home/kaiwan01/tools/gcc-linaro-4.9-2015.05-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/bin/

perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump

kaiwan01@sha-swtool:~/code/OpenCSD/trace-data$ ./disasm.sh

Traceback (most recent call last):

File "/home/kaiwan01/code/OpenCSD/OpenCSD-perf/perf-opencsd-4.8/tools/perf//scripts/python//cs-trace-disasm.py", line 113, in process_event

disasm_output = check_output(disasm).split('\n')

File "/usr/lib/python2.7/subprocess.py", line 567, in check_output

process = Popen(stdout=PIPE, *popenargs, **kwargs)

File "/usr/lib/python2.7/subprocess.py", line 711, in __init__

errread, errwrite)

File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child

raise child_exception

OSError: [Errno 2] No such file or directory

Fatal Python error: problem in Python trace event handler

./disasm.sh: line 7: 24616 Aborted (core dumped) perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump

kaiwan01@sha-swtool:~/code/OpenCSD/trace-data$

Thanks and Best Regards,

Kaiyou

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