Re: CoreSight post from yan_lin_aung@yahoo.com requires approval

18 Nov 2016

      On 18 November 2016 at 00:47, Yan Lin Aung (Dr)
yan_lin_aung@pmail.ntu.edu.sg wrote:
...
Hi Mathieu and Chunyan,
I am now able to get the 4.9-rc1 kernel, decoder and perf all working on Juno r2.
Thanks for the support given.
Very good.
...
@Mathieu: there are typos in your LAS16-210 slides.
In particular, "--perf-thread" in "./perf record -e cs_etm/@20070000.etr/ --perf-thread ./main" should be "--per-thread".
There are a few occurrences of such.
Thanks for pointing it out.
Mathieu
...
Thanks again.
Regards,
Yan Lin Aung
-----Original Message-----
From: Mathieu Poirier [mailto:mathieu.poirier@linaro.org]
Sent: Thursday, November 17, 2016 11:35 PM
To: Yan Lin Aung (Dr)
Cc: Yan Lin Aung; coresight@lists.linaro.org
Subject: Re: CoreSight post from yan_lin_aung@yahoo.com requires approval
On 11 November 2016 at 09:30, Yan Lin Aung (Dr) yan_lin_aung@pmail.ntu.edu.sg wrote:
...
Hi Mathieu,
The platform is DragonBoard 410c.
The latest kernel for this platform is 4.4.23 as mentioned at this link: https://builds.96boards.org/releases/dragonboard410c/linaro/debian/latest/.
Actually, I am not sure of how to compile the kernel branch "perf-opencsd-4.9-rc1" from the OpenCSD github for this platform.
Good day Yan,
I completely missed the above line when reading your email the first time - please accept my apologies on that.
I am attaching the 4.9-rc1 configuration file I use on my setup.  That kernel and configuration file will make sure the kernel boots without needing to deal with power domains with DS-5.
The 4.8 kernel you've been using has 2 problems:

There is a bug in the CS lookup of orphan component (fixed by Sudeep as underlined by Chunyan)
Power domain management isn't functional, which requires powering up CS blocks using a DS-5.

Those two issues are addressed in the 4.9 cycle.  Even then you need the code found on github as modifications to the perf user space tools aren't all upstream yet.
Thanks,
Mathieu
...
Any suggestion/help from you on this?
Thanks.
Regards,
Yan Lin Aung
-----Original Message-----
From: Mathieu Poirier [mailto:mathieu.poirier@linaro.org]
Sent: Friday, November 11, 2016 11:42 PM
To: Yan Lin Aung yan_lin_aung@yahoo.com
Cc: Yan Lin Aung (Dr) yan_lin_aung@pmail.ntu.edu.sg;
coresight@lists.linaro.org
Subject: Re: CoreSight post from yan_lin_aung@yahoo.com requires
approval
On 11 November 2016 at 06:45, Yan Lin Aung yan_lin_aung@yahoo.com wrote:
...
Hi Mathieu,
I have made progress with getting things up.
I now switched to another platform with quad-core A53 processors
because the Juno r2 environment is a bit difficult for me to work with.
The following describes the steps taken:

I have Linux 4.4.23 running on quad-core A53. CoreSight is enabled.

I can see CoreSight components under "/sys/bus/coresight/devices"
linaro@linaro-alip:~/OpenCSD-perf-opencsd-4.9-rc1/tools/perf$ ls
/sys/bus/coresight/devices/ 820000.tpiu  821000.funnel
824000.replicator  825000.etf  826000.etr 841000.funnel  85c000.etm
85d000.etm  85e000.etm  85f000.etm
I can enable/disable ETM and ETR (e.g. echo 1 >
85c000.etm/enable_source, cat 85c000.etm/enable_source).
Ok, but that is not required since identification of the sink to use is now done from the perf cmd line.
...

I am able to build OpenCSD library. Then, share libraries

(libcstraced_c_api.so, libcstraced.so) are copied to "/usr/lib".
Then, I tried testing the library by running "c_api_pkt_print_test".
Below shows the sample outputs.
C-API packet print test
Library Version 0.4.2
Idx:86; I_NOT_SYNC : I Stream not synchronised Idx:1650; I_ASYNC :
Alignment Synchronisation.
Idx:1662; I_TRACE_INFO : Trace Info.
Idx:1666; I_ADDR_L_64IS0 : Address, Long, 64 bit, IS0.;
Addr=0xFFFFFFC000096A00; Idx:1675; I_TRACE_ON : Trace On.
Idx:1676; I_ADDR_CTXT_L_64IS0 : Address & Context, Long, 64 bit,
IS0.; Addr=0xFFFFFFC000096A00; Ctxt: AArch64,EL1, NS; CID=0x00000000;
VMID=0x0000; Idx:1692; I_ATOM_F1 : Atom format 1.; E Idx:1693;
I_ADDR_L_64IS0 : Address, Long, 64 bit, IS0.;
Addr=0xFFFFFFC000594AC0; Idx:1703; I_ATOM_F1 : Atom format 1.; E Idx:1704; I_ADDR_S_IS0 :
Address, Short, IS0.; Addr=0xFFFFFFC000592B58 ~[0x12B58] Idx:1707;
I_ATOM_F3 : Atom format 3.; ENN Idx:1708; I_ATOM_F1 : Atom format 1.;
E Idx:1709; I_ADDR_L_32IS0 : Address, Long, 32 bit, IS0.;
Addr=0x005AC4C8; Idx:1715; I_ATOM_F2 : Atom format 2.; EE Idx:1716;
I_ADDR_L_32IS0 : Address, Long, 32 bit, IS0.; Addr=0x000EA588;
Idx:1721; I_ATOM_F3 : Atom format 3.; NNE Idx:1722; I_ADDR_L_32IS0 :
Address, Long, 32 bit, IS0.; Addr=0x00592B60;

Then, perf tool under the "OpenCSD-perf-opencsd-4.9-rc1" branch is

compiled on target.
The following is the compilation log. It seems to me there is no issue with
compilation ("CC       util/cs-etm-decoder/cs-etm-decoder.o" is compiled
properly). I also exported "CSTRACE_PATH=/home/linaro/OpenCSD-0.4.2/decoder"
before compilation.
linaro@linaro-alip:~/OpenCSD-perf-opencsd-4.9-rc1$ make -C
tools/perf/
make: Entering directory
'/home/linaro/OpenCSD-perf-opencsd-4.9-rc1/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ OFF ]
...                           bpf: [ on  ]
Makefile.config:349: BPF prologue is not supported by architecture
arm64, missing regs_query_register_offset()
Makefile.config:400: No debug_frame support found in
libunwind-aarch64
Makefile.config:459: No debug_frame support found in libunwind
  GEN      common-cmds.h
  HOSTCC   fixdep.o
  HOSTCC   pmu-events/json.o
  HOSTLD   fixdep-in.o
  LINK     fixdep
  HOSTCC   pmu-events/jsmn.o
  HOSTCC   pmu-events/jevents.o
  CC       fd/array.o
  CC       fs/fs.o
  HOSTLD   pmu-events/jevents-in.o
  CC       event-parse.o
  LD       fd/libapi-in.o
  CC       cpu.o
  CC       debug.o
  CC       str_error_r.o
  CC       fs/tracing_path.o
  CC       exec-cmd.o
  PERF_VERSION = 4.9.0-rc1
Warning: tools/include/uapi/linux/bpf.h differs from kernel
  CC       libbpf.o
  LD       fs/libapi-in.o
  LD       libapi-in.o
  AR       libapi.a
  CC       bpf.o
  CC       help.o
  CC       pager.o
  LD       libbpf-in.o
  LINK     libbpf.a
  LINK     pmu-events/jevents
  CC       event-plugin.o
  CC       plugin_jbd2.o
  CC       parse-options.o
  LD       plugin_jbd2-in.o
  CC       plugin_hrtimer.o
  LD       plugin_hrtimer-in.o
  CC       trace-seq.o
  CC       plugin_kmem.o
  CC       run-command.o
  LD       plugin_kmem-in.o
  CC       plugin_kvm.o
  CC       parse-filter.o
  CC       sigchain.o
  LD       plugin_kvm-in.o
  CC       plugin_mac80211.o
  LD       plugin_mac80211-in.o
  CC       plugin_sched_switch.o
  CC       plugin_function.o
  CC       parse-utils.o
  LD       plugin_sched_switch-in.o
  CC       plugin_xen.o
  LD       plugin_xen-in.o
  CC       plugin_scsi.o
  LD       plugin_function-in.o
  CC       plugin_cfg80211.o
  CC       kbuffer-parse.o
  LD       plugin_scsi-in.o
  LD       plugin_cfg80211-in.o
  LINK     plugin_jbd2.so
  LINK     plugin_hrtimer.so
  LINK     plugin_kmem.so
  LINK     plugin_kvm.so
  LINK     plugin_mac80211.so
  LD       libtraceevent-in.o
  LINK     libtraceevent.a
  LINK     plugin_sched_switch.so
  GEN      perf-archive
  LINK     plugin_function.so
  GEN      perf-with-kcore
  CC       ui/gtk/browser.o
  LINK     plugin_xen.so
  LINK     plugin_scsi.so
  LINK     plugin_cfg80211.so
  CC       subcmd-config.o
  CC       ui/gtk/hists.o
  LD       libsubcmd-in.o
  CC       util/alias.o
  AR       libsubcmd.a
Warning: tools/arch/x86/lib/memcpy_64.S differs from kernel
Warning: tools/arch/x86/lib/memset_64.S differs from kernel
Warning: tools/arch/arm/include/uapi/asm/kvm.h differs from kernel
  CC       util/annotate.o
Warning: tools/include/uapi/asm-generic/mman-common.h differs from kernel
  CC       builtin-bench.o
  CC       builtin-annotate.o
  CC       ui/gtk/setup.o
  CC       ui/gtk/util.o
  CC       builtin-config.o
  CC       builtin-diff.o
  CC       util/block-range.o
  CC       ui/gtk/helpline.o
  CC       arch/common.o
  CC       util/build-id.o
  CC       arch/arm64/util/dwarf-regs.o
  CC       arch/arm64/util/unwind-libunwind.o
  CC       ui/gtk/progress.o
  CC       builtin-evlist.o
  CC       arch/arm64/util/../../arm/util/pmu.o
  CC       util/config.o
  CC       arch/arm64/util/../../arm/util/auxtrace.o
  CC       builtin-help.o
  CC       ui/gtk/annotate.o
  CC       arch/arm64/util/../../arm/util/cs-etm.o
  CC       builtin-sched.o
  CC       util/ctype.o
  LD       arch/arm64/util/libperf-in.o
  CC       arch/arm64/tests/regs_load.o
  CC       arch/arm64/tests/dwarf-unwind.o
  CC       util/db-export.o
  LD       ui/gtk/gtk-in.o
  LD       arch/arm64/tests/libperf-in.o
  LD       arch/arm64/libperf-in.o
  LD       arch/libperf-in.o
  CC       ui/setup.o
  CC       util/env.o
  CC       ui/helpline.o
  LD       gtk-in.o
  GEN      pmu-events/pmu-events.c
  CC       pmu-events/pmu-events.o
  LD       pmu-events/pmu-events-in.o
  CC       ui/progress.o
  CC       util/event.o
  CC       ui/util.o
  GEN      libtraceevent-dynamic-list
  CC       ui/hist.o
  CC       ui/stdio/hist.o
  CC       builtin-buildid-list.o
  CC       builtin-buildid-cache.o
  CC       builtin-list.o
  CC       ui/browser.o
  CC       util/evlist.o
  CC       builtin-record.o
  CC       builtin-report.o
  CC       ui/browsers/annotate.o
  CC       ui/browsers/hists.o
  CC       util/evsel.o
  CC       builtin-stat.o
  CC       builtin-timechart.o
  CC       builtin-top.o
  CC       util/evsel_fprintf.o
  CC       builtin-script.o
  CC       util/find_bit.o
  CC       util/kallsyms.o
  CC       util/levenshtein.o
  CC       util/llvm-utils.o
  BISON    util/parse-events-bison.c
  CC       builtin-kmem.o
  CC       ui/browsers/map.o
  CC       util/perf_regs.o
  CC       util/path.o
  CC       ui/browsers/scripts.o
  CC       util/rbtree.o
  CC       ui/browsers/header.o
  CC       util/libstring.o
  CC       builtin-lock.o
  CC       util/bitmap.o
  LD       ui/browsers/libperf-in.o
  CC       util/hweight.o
  CC       ui/tui/setup.o
  CC       util/quote.o
  CC       util/strbuf.o
  CC       ui/tui/util.o
  CC       util/string.o
  CC       builtin-kvm.o
  CC       builtin-inject.o
  CC       ui/tui/helpline.o
  CC       util/strlist.o
  CC       ui/tui/progress.o
  CC       util/strfilter.o
  LD       ui/tui/libperf-in.o
  LD       ui/libperf-in.o
  GEN      python/perf.so
  CC       scripts/perl/Perf-Trace-Util/Context.o
  CC       builtin-mem.o
  CC       util/top.o
  LD       scripts/perl/Perf-Trace-Util/libperf-in.o
  CC       scripts/python/Perf-Trace-Util/Context.o
  CC       builtin-data.o
  CC       util/usage.o
  LD       scripts/python/Perf-Trace-Util/libperf-in.o
  LD       scripts/libperf-in.o
  CC       builtin-version.o
  CC       builtin-trace.o
  CC       util/dso.o
  CC       builtin-probe.o
  CC       bench/sched-messaging.o
  CC       bench/sched-pipe.o
  CC       util/symbol.o
  CC       bench/mem-functions.o
  CC       bench/futex-hash.o
  CC       bench/futex-wake.o
  CC       bench/futex-wake-parallel.o
  CC       bench/futex-requeue.o
  CC       util/symbol_fprintf.o
  CC       util/color.o
  CC       bench/futex-lock-pi.o
  CC       bench/numa.o
  CC       util/header.o
  CC       util/callchain.o
  CC       util/values.o
  LD       bench/perf-in.o
  CC       tests/builtin-test.o
  CC       tests/parse-events.o
  CC       perf.o
  CC       util/debug.o
  CC       util/machine.o
  CC       util/map.o
  CC       util/pstack.o
  CC       tests/dso-data.o
  CC       util/session.o
  CC       tests/attr.o
  CC       util/syscalltbl.o
  CC       tests/vmlinux-kallsyms.o
  CC       util/ordered-events.o
  CC       tests/openat-syscall.o
  CC       tests/openat-syscall-all-cpus.o
  CC       tests/openat-syscall-tp-fields.o
  CC       tests/mmap-basic.o
  CC       util/comm.o
  CC       tests/perf-record.o
  CC       util/thread.o
  CC       tests/evsel-roundtrip-name.o
  CC       tests/evsel-tp-sched.o
  CC       tests/fdarray.o
  CC       util/thread_map.o
  CC       tests/pmu.o
  CC       tests/hists_common.o
  CC       util/trace-event-parse.o
  CC       tests/hists_link.o
  CC       util/parse-events-bison.o
  BISON    util/pmu-bison.c
  CC       util/trace-event-read.o
  CC       util/trace-event-info.o
  CC       tests/hists_filter.o
  CC       util/trace-event-scripting.o
  CC       util/trace-event.o
  CC       tests/hists_output.o
  CC       tests/hists_cumulate.o
  CC       util/svghelper.o
  CC       tests/python-use.o
  CC       tests/bp_signal.o
  CC       tests/bp_signal_overflow.o
  CC       tests/task-exit.o
  CC       tests/sw-clock.o
  CC       tests/mmap-thread-lookup.o
  CC       util/sort.o
  CC       util/hist.o
  CC       tests/thread-mg-share.o
  CC       tests/switch-tracking.o
  CC       util/util.o
  CC       tests/keep-tracking.o
  CC       util/xyarray.o
  CC       tests/code-reading.o
  CC       tests/sample-parsing.o
  CC       tests/parse-no-sample-id-all.o
  CC       tests/kmod-path.o
  CC       tests/thread-map.o
  CC       util/cpumap.o
  CC       util/cgroup.o
  CC       tests/llvm.o
  CC       util/target.o
  CC       tests/bpf.o
  CC       tests/topology.o
  CC       util/rblist.o
  CC       util/intlist.o
  CC       util/vdso.o
  CC       util/counts.o
  CC       tests/cpumap.o
  CC       tests/stat.o
  CC       tests/event_update.o
  CC       tests/event-times.o
  CC       util/stat.o
  CC       util/stat-shadow.o
  CC       tests/backward-ring-buffer.o
  CC       tests/sdt.o
  CC       tests/is_printable_array.o
  CC       tests/bitmap.o
  CC       tests/dwarf-unwind.o
  CC       tests/llvm-src-base.o
  CC       util/record.o
  CC       tests/llvm-src-kbuild.o
  CC       tests/llvm-src-prologue.o
  CC       tests/llvm-src-relocation.o
  CC       util/srcline.o
  CC       util/data.o
  LD       tests/perf-in.o
  CC       util/tsc.o
  CC       util/cloexec.o
  CC       util/call-path.o
  CC       util/thread-stack.o
  CC       util/auxtrace.o
  CC       util/intel-pt-decoder/intel-pt-pkt-decoder.o
  LD       perf-in.o
  GEN      util/intel-pt-decoder/inat-tables.c
  CC       util/intel-pt-decoder/intel-pt-log.o
  CC       util/intel-pt-decoder/intel-pt-decoder.o
  CC       util/intel-pt-decoder/intel-pt-insn-decoder.o
  CC       util/cs-etm-decoder/cs-etm-decoder.o
  LD       util/cs-etm-decoder/libperf-in.o
  CC       util/scripting-engines/trace-event-perl.o
  CC       util/scripting-engines/trace-event-python.o
  CC       util/intel-pt.o
  LD       util/intel-pt-decoder/libperf-in.o
  CC       util/intel-bts.o
  CC       util/cs-etm.o
  LD       util/scripting-engines/libperf-in.o
  CC       util/parse-branch-options.o
  CC       util/parse-regs-options.o
  CC       util/term.o
  CC       util/help-unknown-cmd.o
  CC       util/mem-events.o
  CC       util/vsprintf.o
  CC       util/drv_configs.o
  CC       util/bpf-loader.o
  CC       util/symbol-elf.o
  CC       util/probe-file.o
  CC       util/probe-event.o
  CC       util/probe-finder.o
  CC       util/dwarf-aux.o
  CC       util/dwarf-regs.o
  CC       util/unwind-libunwind-local.o
  CC       util/unwind-libunwind.o
  CC       util/libunwind/arm64.o
  CC       util/zlib.o
  CC       util/lzma.o
  CC       util/demangle-java.o
  CC       util/demangle-rust.o
  CC       util/jitdump.o
  CC       util/genelf.o
  CC       util/genelf_debug.o
  FLEX     util/parse-events-flex.c
  FLEX     util/pmu-flex.c
  CC       util/parse-events.o
  CC       util/pmu-bison.o
  CC       util/parse-events-flex.o
  CC       util/pmu.o
  CC       util/pmu-flex.o
  LD       util/libperf-in.o
  LD       libperf-in.o
  AR       libperf.a
  LINK     perf
  LINK     libperf-gtk.so
make: Leaving directory
'/home/linaro/OpenCSD-perf-opencsd-4.9-rc1/tools/perf'

Then, I test the perf as follows:

linaro@linaro-alip:~/OpenCSD-perf-opencsd-4.9-rc1/tools/perf$ ./perf
record -e cs_etm/@826000.etr/ --per-thread uname invalid or
unsupported event: 'cs_etm/@826000.etr/'
Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>]
    or: perf record [<options>] -- <command> [<options>]
-e, --event <event>   event selector. use 'perf list' to list available

events
It seems that "perf" is not able to populate the cs_etm events. "perf list"
output shows:
linaro@linaro-alip:~/OpenCSD-perf-opencsd-4.9-rc1/tools/perf$ ./perf
list
List of pre-defined events (to be used in -e):
branch-misses                                      [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
alignment-faults                                   [Software event]
  bpf-output                                         [Software event]
  context-switches OR cs                             [Software event]
  cpu-clock                                          [Software event]
  cpu-migrations OR migrations                       [Software event]
  dummy                                              [Software event]
  emulation-faults                                   [Software event]
  major-faults                                       [Software event]
  minor-faults                                       [Software event]
  page-faults OR faults                              [Software event]
  task-clock                                         [Software event]
L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
rNNN                                               [Raw hardware event
descriptor]
  cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event
descriptor]
   (see 'man perf-list' on how to encode it)
mem:<addr>[/len][:access]                          [Hardware breakpoint]
I think I am very close to getting things up properly. Also, I need
to get this working for a research work here.
Any idea on why "perf" is not showing the events corresponding to "cs_etm"?
Where possibly is the issue?
Your kind help on this will be very much appreciated.
Did you get the kernel from github as per my previous email?  Kernel
4.4.23 is very old and doesn't have all of the CoreSight features required to integrate with perf.
Also, keep in mind that since you are not working with Juno CPUIdle _needs_ to be disabled and you have to do make sure all power domains and clocks for the CoreSight IP blocks are managed properly.  Out of curiosity, what platform is this?
Mathieu
...
Looking forward to hear from you and thanks.
Regards,
Yan Lin Aung
On Thursday, November 10, 2016 12:23 AM, Mathieu Poirier
mathieu.poirier@linaro.org wrote:
On 9 November 2016 at 08:06, Yan Lin Aung yan_lin_aung@yahoo.com wrote:
...
Hi Mathieu,
Thanks for your reply. Sorry for a bit of delay on my response.
Just a bit of intro on myself. I am a research staff from Nanyang
Technological University, Singapore.
Basically, I used the build scripts provided with Linaro
deliverables for Juno and TC2 from ARM at this link:
https://community.arm.com/docs/DOC-10803
I am able to get the system running either with prebuilt binaries or
building from source.
For Linaro release 16.09 with built from source option, the Linux
4.8.x runs on Juno r2.
In the default configuration, coresight was not activated.
I tried to update the config file to enable coresight drive and
recompiled.
However, the coresight devices are not populated somehow.
I would like to have a setup with which I will be able to do some
experiments as demonstrated in your presentation at the very minimum.
So, my specific question will be that how shall I proceed to get
coresight, perf with coresight and OpenCSD working properly using
the Linaro release 16.09.
You won't have the required pieces in 16.09.  To replicate the
examples shown in the presentation you will have to use the kernel
found on github [1].  Since you have a Juno R2 I suggest to use
branch
perf-opencsd-4.9-rc1 - that way you won't have to deal with power
domain management.  Note that CoreSight is not part of the default V8
configuration as needs to be explicitly enabled.
Thanks,
Mathieu
[1]. https://github.com/Linaro/OpenCSD
...
If you are not using Linaro release 16.09 and have other means of
getting things up with coresight, perf and OpenCSD on Juno, please
kindly share with me. I am quite keen to follow your steps and try
it out at my side here.
Looking forward to hear from you and thanks.
Regards,
Yan Lin Aung
On Monday, November 7, 2016 11:32 PM, Mathieu Poirier
mathieu.poirier@linaro.org wrote:
...
---------- Forwarded message ----------
From: Yan Lin Aung yan_lin_aung@yahoo.com
To: "coresight@lists.linaro.org" coresight@lists.linaro.org
Cc:
Date: Mon, 7 Nov 2016 03:45:45 +0000 (UTC)
Subject: perf with CoreSight and OpenCSD on TC2 and Juno r2 Hi
Linaro Coresight Team,
I came to know of "Hardware Assisted Tracing on ARM with CoreSight
and OpenCSD" by Mathieu Poirier.
In his presentation, he mentioned the reference platforms to
evaluate perf with CoreSight and OpenCSD are Vexpress TC2 and Juno
(Page 7 on his slide).
I just checked the "HOWTO.MD" at OpenCSD github site.
However, there is very limited info on how to get started with
Vexpress
TC2 and Juno.
I have access to the TC2 and Juno r2 platforms.
Please provide a rather detailed version of getting started guide
to try out perf with CoreSight and OpenCSD on either TC2 or Juno r2.
Hello Yan Lin,
You are correct, the HOWTO.md on github concentrates on CoreSight
and doesn't address platform specifics - something like this would
be out of scope.  I'm not exactly sure of what you are looking for
in a "getting started guide"...  Both Juno and TC2 are well
supported upstream and can be booted with a mainline kernel.  The
choice of bootloader and user space are entirely up to users and
don't affect the CoreSight suite nor its integration with the perf subsystem.
The fact that you have access to both platform leads me to believe
you are part of a large organisation.  As such there is definitely
people around you with experience on how to set-up the platforms.
I can try to answer specific questions if you have any.
Thanks,
Mathieu
...
Thanx.
Regards,
Yan Lin Aung

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