CoreSight February 2017

coresight@lists.linaro.org

6 participants
5 discussions

[PATCH 0/2] Support generation of last branch events with perf inject

by Sebastian Pop

The first patch is a minor typo to allow printing the trace info. The second patch enables translation of perf.data files into last branch events that are then processed by the autoFDO tool to extract a coverage file. Sebastian Pop (2): perf tools: fix printing of auxtrace_info perf tools: new inject capabilitity for CoreSight traces tools/perf/Documentation/cs-etm.txt | 38 +++++++++ tools/perf/util/cs-etm.c | 163 ++++++++++++++++++++++++++++++++++-- 2 files changed, 196 insertions(+), 5 deletions(-) create mode 100644 tools/perf/Documentation/cs-etm.txt -- 2.6.3

7 years, 8 months

[PATCH] arm64: dts: juno: update definition for programmable replicator.

by Mike Leach

Juno platforms have a programmable replicator splitting the trace output to TPIU and ETR. Currently this is not being programmed as it is being treated as a none-programmable replicator - which is the default operational mode for these devices. The TPIU in the system is enabled by default, and this combination is causing back-pressure in the trace system resulting in overflows at the source. Replaces the existing definition with one that defines the programmable replicator, using the "qcom,coresight-replicator1x" driver that provides the correct functionality for CoreSight programmable replicators. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- arch/arm64/boot/dts/arm/juno-base.dtsi | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi index 9d799d9..6546e23 100644 --- a/arch/arm64/boot/dts/arm/juno-base.dtsi +++ b/arch/arm64/boot/dts/arm/juno-base.dtsi @@ -372,12 +372,14 @@ }; }; - coresight-replicator { - /* - * Non-configurable replicators don't show up on the - * AMBA bus. As such no need to add "arm,primecell". - */ - compatible = "arm,coresight-replicator"; + coresight-replicator@20120000 { + + compatible = "qcom,coresight-replicator1x", "arm,primecell"; + reg = <0 0x20120000 0 0x1000>; + + clocks = <&soc_smc50mhz>; + clock-names = "apb_pclk"; + power-domains = <&scpi_devpd 0>; ports { #address-cells = <1>; -- 2.7.4

7 years, 8 months

[PATCH] hwtracing: coresight: Fixes coresight DT parse to get correct output port ID.

by Mike Leach

Corrected to get the port numbering to allow programmable replicator driver to operate correctly. By convention, CoreSight devices number ports, not endpoints in the .dts files:- port { reg<N> endpoint { } } Existing code read endpoint number - always 0x0, rather than the correct port number. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- drivers/hwtracing/coresight/of_coresight.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c index 629e031..09142e9 100644 --- a/drivers/hwtracing/coresight/of_coresight.c +++ b/drivers/hwtracing/coresight/of_coresight.c @@ -149,7 +149,7 @@ struct coresight_platform_data *of_get_coresight_platform_data( continue; /* The local out port number */ - pdata->outports[i] = endpoint.id; + pdata->outports[i] = endpoint.port; /* * Get a handle on the remote port and parent -- 2.7.4

7 years, 8 months

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

by Mathieu Poirier

On 11 November 2016 at 06:45, Yan Lin Aung <yan_lin_aung(a)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: > > 1) 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. > > 2) 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; > > > 3) 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' > > 4) Then, I test the perf as follows: > > linaro@linaro-alip:~/OpenCSD-perf-opencsd-4.9-rc1/tools/perf$ ./perf record > -e cs_etm/(a)826000.etr/ --per-thread uname > invalid or unsupported event: 'cs_etm/(a)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(a)linaro.org> wrote: > > > On 9 November 2016 at 08:06, Yan Lin Aung <yan_lin_aung(a)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(a)linaro.org> wrote: >> >> >>> ---------- Forwarded message ---------- >>> From: Yan Lin Aung <yan_lin_aung(a)yahoo.com> >>> To: "coresight(a)lists.linaro.org" <coresight(a)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 >>> >> >> > >

7 years, 9 months

Re: Trace issue on Linux-4.9-rc1

by Mathieu Poirier

On 19 December 2016 at 07:45, Yehuda Yitschak <yehuday(a)marvell.com> wrote: > Hi Mathieu > > > > After some more debug I was able to resolve the trace issue I had on > Linux-4.9-rc1 > > If you remember I only got trace for CPU2 out of 4 CPUs which was really > strange > > > > Turns out the issue comes from some quirk in our busses > > Our internal fabric is not able to write 64bit data to registers, only to > memory > > So the address comparators in the ETM got corrupted values and there wasn’t > any match on address for most CPUs. > > For some cryptic reason only CPU2 got somewhat reasonable comparator value > (still not the intended, but a working one) and so it could generate trace > > > > Now I am able to generate proper trace consistently. > Very good. > > > I was wondering how can I add latency or timing information to the trace > > I noticed the cs_etm event can accept an option of “cycacc” and “timestamp“ > > How can I view this information later ? > > Should I use perf script –f ? That information, when configured on the cmd line, will end up in the perf.data file. From there it will be decoded and rendered by the openCSD library. Mike, can you comment on the format of the information that will be found in the packet? Perhaps you have an example somewhere of traces generated by the "cycacc" and "timestamp" option? You will definitely need to create your own scripts as nothing we have done so far uses those configuration parameters. Thanks, Mathieu > > > > Thanks a lot > > > > ------------------- > > Yehuda Yitschak > > Marvell Semiconductor Ltd. > >

7 years, 9 months

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CoreSight February 2017