CoreSight

coresight@lists.linaro.org

6 participants
2338 discussions

[PATCH] opencsd: update content to work with kernel v4.9

by Mathieu Poirier

Changed openCSD library version number from v0.4.2 to v0.5 and pumped the kernel version to v4.9. Signed-off-by: Mathieu Poirier <mathieu.poirier(a)linaro.org> --- HOWTO.md | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/HOWTO.md b/HOWTO.md index 239a2cd194c3..6f768ed8a72c 100644 --- a/HOWTO.md +++ b/HOWTO.md @@ -7,7 +7,7 @@ This HOWTO explains how to use the perf cmd line tools and the openCSD library to collect and extract program flow traces generated by the CoreSight IP blocks on a Linux system. The examples have been generated using an aarch64 Juno-r0 platform. All information is considered accurate and tested -using library version v0.4.2 and the latest perf branch `perf-opencsd-4.8` +using library version v0.5 and the latest perf branch `perf-opencsd-4.9` on the [OpenCSD github repository][1]. @@ -15,8 +15,8 @@ On Target Trace Acquisition - Perf Record ----------------------------------------- All the enhancement to the Perf tools that support the new `cs_etm` pmu have not been upstreamed yet. To get the required functionality branch -`perf-opencsd-4.8` needs to be downloaded to the target system where -traces are to be collected. This branch is an upstream v4.8 kernel +`perf-opencsd-4.9` needs to be downloaded to the target system where +traces are to be collected. This branch is an upstream v4.9 kernel supplemented with modifications to the CoreSight framework and drivers to be usable by the Perf core. The remaining out of tree patches are being upstreamed incrementally. @@ -261,14 +261,14 @@ the host's (which has nothing to do with the target) architecture: Off Target Perf Tools Compilation --------------------------------- As stated above not all the pieces of the solution have been upstreamed. To -get all the components branch `perf-opencsd-4.8` needs to be +get all the components branch `perf-opencsd-4.9` needs to be obtained: - linaro@t430:~/linaro/coresight$ git clone -b perf-opencsd-4.8 https://github.com/Linaro/OpenCSD.git perf-opencsd-4.8 + linaro@t430:~/linaro/coresight$ git clone -b perf-opencsd-4.9 https://github.com/Linaro/OpenCSD.git perf-opencsd-4.9 ... ... - linaro@t430:~/linaro/coresight$ ls perf-opencsd-4.8/ + linaro@t430:~/linaro/coresight$ ls perf-opencsd-4.9/ arch certs CREDITS Documentation firmware include ipc Kconfig lib Makefile net REPORTING-BUGS scripts sound usr block COPYING crypto drivers fs init Kbuild kernel MAINTAINERS mm README samples security tools virt @@ -279,12 +279,12 @@ successful, but handling of CoreSight trace data won't be supported. **See perf-test-scripts below for assistance in creating a build and test enviroment.** - linaro@t430:~/linaro/coresight$ cd perf-opencsd-4.8 - linaro@t430:~/linaro/coresight/perf-opencsd-4.8$ export CSTRACE_PATH=~/linaro/coresight/my-opencsd/decoder - linaro@t430:~/linaro/coresight/perf-opencsd-4.8$ make -C tools/perf + linaro@t430:~/linaro/coresight$ cd perf-opencsd-4.9 + linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ export CSTRACE_PATH=~/linaro/coresight/my-opencsd/decoder + linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ make -C tools/perf ... ... - linaro@t430:~/linaro/coresight/perf-opencsd-4.8$ ls -l tools/perf/perf + linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ ls -l tools/perf/perf -rwxrwxr-x 1 linaro linaro 6276360 Mar 3 10:05 tools/perf/perf @@ -323,7 +323,7 @@ to be sure everything is clean. linaro@t430:~/linaro/coresight/sept20$ rm -rf ~/.debug linaro@t430:~/linaro/coresight/sept20$ cp -dpR .debug ~/ linaro@t430:~/linaro/coresight/sept20$ export LD_LIBRARY_PATH=~/linaro/coresight/my-opencsd/decoder/lib/linux64/dbg/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.8/tools/perf/perf report --stdio + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf report --stdio # To display the perf.data header info, please use --header/--header-only options. # @@ -367,7 +367,7 @@ to be sure everything is clean. Additional data can be obtained, which contains a dump of the trace packets received using the command - mjl@ubuntu-vbox:./perf-opencsd-4.8/coresight/tools/perf/perf report --stdio --dump + mjl@ubuntu-vbox:./perf-opencsd-4.9/coresight/tools/perf/perf report --stdio --dump resulting a large amount of data, trace looking like:- @@ -416,10 +416,10 @@ Trace Decoding with Perf Script Working with perf scripts needs more command line options but yields interesting results. - linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.8/tools/perf/ + linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.9/tools/perf/ linaro@t430:~/linaro/coresight/sept20$ export SCRIPT_PATH=$EXEC_PATH/scripts/python/ linaro@t430:~/linaro/coresight/sept20$ export XTOOL_PATH=/your/aarch64/toolchain/path/bin/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.8/tools/perf/perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump 7f89f24d80: 910003e0 mov x0, sp 7f89f24d84: 94000d53 bl 7f89f282d0 <free@plt+0x3790> @@ -451,18 +451,18 @@ Kernel Trace Decoding When dealing with kernel space traces the vmlinux file has to be communicated explicitely to perf using the "--vmlinux" command line option: - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.8/tools/perf/perf report --stdio --vmlinux=./vmlinux + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf report --stdio --vmlinux=./vmlinux ... ... - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.8/tools/perf/perf script --vmlinux=./vmlinux + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf script --vmlinux=./vmlinux When using scripts things get a little more convoluted. Using the same example an above but for traces but for kernel traces, the command line becomes: - linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.8/tools/perf/ + linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.9/tools/perf/ linaro@t430:~/linaro/coresight/sept20$ export SCRIPT_PATH=$EXEC_PATH/scripts/python/ linaro@t430:~/linaro/coresight/sept20$ export XTOOL_PATH=/your/aarch64/toolchain/path/bin/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.8/tools/perf/perf --exec-path=${EXEC_PATH} script \ + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf --exec-path=${EXEC_PATH} script \ --vmlinux=./vmlinux \ --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- \ -d ${XTOOLS_PATH}/aarch64-linux-gnu-objdump \ -- 2.7.4

8 years, 4 months

[PATCH v2] cs-etm: Update to perf cs-etm decoder for OpenCSD v0.5

by Mike Leach

Adds additional generic packet types to switch statement in decoder to ensure compilation without errors. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index e4c929e..b086be9 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -201,6 +201,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( case OCSD_GEN_TRC_ELEM_CYCLE_COUNT: case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN: case OCSD_GEN_TRC_ELEM_EVENT: + case OCSD_GEN_TRC_ELEM_SWTRACE: + case OCSD_GEN_TRC_ELEM_CUSTOM: default: break; } -- 2.7.4

8 years, 5 months

[PATCH 00/13] OpenCSD v0.5.0 release.

by Mike Leach

OpenCSD: Patch set for v0.5.0 release. External Decoder C-API plus examples and documentation. This allows custom decoders to be attached into the library infrastructure. STM full decoder - outputs generic software trace packets. Mike Leach (13): opencsd: Custom external decoder C-API (initial development). opencsd: Initial objects and types for STM packet decode. opencsd: Library Version defines moved to separate header file. opencsd: STM full decoder implementation opencsd: Custom External Decoder C-API (adds factory and wrappers) opencsd: A "test" decoder to prove the external decoder API opencsd: Custom Ext Decoder C-API (adds pkt monitor and sink CB) opencsd: Custom Ext Decoder C-API (adds test decoder) opencsd: adds VS2015 build files. opencsd: Modify C-API test program to use echo_test decoder. opencsd: Move custom packet string C-API to main header opencsd: Documentation and Doxygen comment updates. opencsd: Linux and windows build updates .gitignore | 2 + README.md | 8 +- decoder/build/linux/makefile | 1 + decoder/build/linux/rctdl_c_api_lib/makefile | 3 +- decoder/build/linux/ref_trace_decode_lib/makefile | 3 +- decoder/build/win-vs2015/opencsd.props | 20 + .../rctdl_c_api_lib/rctdl_c_api_lib.vcxproj | 329 +++++++++++++++ .../rctdl_c_api_lib.vcxproj.filters | 54 +++ .../ref_trace_decode_lib/ref_trace_decode_lib.sln | 147 +++++++ .../ref_trace_decode_lib.vcxproj | 440 ++++++++++++++++++++ .../ref_trace_decode_lib.vcxproj.filters | 449 ++++++++++++++++++++ .../win/rctdl_c_api_lib/rctdl_c_api_lib.vcxproj | 3 + .../rctdl_c_api_lib.vcxproj.filters | 9 + .../ref_trace_decode_lib.vcxproj | 4 + .../ref_trace_decode_lib.vcxproj.filters | 12 + decoder/docs/doxygen_config.dox | 5 +- decoder/docs/external_custom.md | 148 +++++++ ...RM Trace and Debug Snapshot file format 0v2.pdf | Bin 0 -> 435644 bytes decoder/docs/test_progs.md | 21 +- decoder/include/c_api/ocsd_c_api_cust_fact.h | 54 +++ decoder/include/c_api/ocsd_c_api_cust_impl.h | 158 ++++++++ decoder/include/c_api/ocsd_c_api_custom.h | 253 ++++++++++++ decoder/include/c_api/opencsd_c_api.h | 45 ++ decoder/include/common/ocsd_lib_dcd_register.h | 9 + decoder/include/common/trc_component.h | 1 + decoder/include/common/trc_gen_elem.h | 29 +- decoder/include/ocsd_if_types.h | 75 +++- decoder/include/ocsd_if_version.h | 65 +++ decoder/include/stm/trc_dcd_mngr_stm.h | 8 +- decoder/include/stm/trc_pkt_decode_stm.h | 103 +++++ decoder/include/stm/trc_pkt_elem_stm.h | 4 +- decoder/include/stm/trc_pkt_types_stm.h | 2 +- decoder/include/trc_gen_elem_types.h | 32 +- decoder/source/c_api/ocsd_c_api.cpp | 38 +- decoder/source/c_api/ocsd_c_api_custom_obj.cpp | 431 ++++++++++++++++++++ decoder/source/c_api/ocsd_c_api_custom_obj.h | 189 +++++++++ decoder/source/c_api/ocsd_c_api_obj.h | 51 +++ decoder/source/ocsd_error.cpp | 1 + decoder/source/ocsd_lib_dcd_register.cpp | 61 ++- decoder/source/ocsd_version.cpp | 2 +- decoder/source/stm/trc_pkt_decode_stm.cpp | 299 ++++++++++++++ decoder/source/stm/trc_pkt_proc_stm.cpp | 5 +- decoder/source/trc_component.cpp | 13 +- decoder/source/trc_gen_elem.cpp | 70 +++- decoder/source/trc_printable_elem.cpp | 4 +- .../build/linux/c_api_pkt_print_test/makefile | 4 +- .../tests/build/linux/echo_test_dcd_lib/makefile | 83 ++++ .../c_api_pkt_print_test.vcxproj | 333 +++++++++++++++ .../c_api_pkt_print_test.vcxproj.filters | 22 + .../ext_dcd_echo_test/ext_dcd_echo_test.vcxproj | 152 +++++++ .../ext_dcd_echo_test.vcxproj.filters | 33 ++ .../simple_pkt_print_c_api.vcxproj | 333 +++++++++++++++ .../simple_pkt_print_c_api.vcxproj.filters | 22 + .../snapshot_parser_lib.vcxproj | 318 +++++++++++++++ .../snapshot_parser_lib.vcxproj.filters | 72 ++++ .../trc_pkt_lister/trc_pkt_lister.vcxproj | 306 ++++++++++++++ .../trc_pkt_lister/trc_pkt_lister.vcxproj.filters | 39 ++ .../c_api_echo_test/ext_dcd_echo_test.c | 451 +++++++++++++++++++++ .../c_api_echo_test/ext_dcd_echo_test.h | 93 +++++ .../c_api_echo_test/ext_dcd_echo_test_fact.c | 104 +++++ .../c_api_echo_test/ext_dcd_echo_test_fact.h | 48 +++ decoder/tests/source/c_api_pkt_print_test.c | 89 +++- 62 files changed, 6063 insertions(+), 99 deletions(-) create mode 100644 decoder/build/win-vs2015/opencsd.props create mode 100644 decoder/build/win-vs2015/rctdl_c_api_lib/rctdl_c_api_lib.vcxproj create mode 100644 decoder/build/win-vs2015/rctdl_c_api_lib/rctdl_c_api_lib.vcxproj.filters create mode 100644 decoder/build/win-vs2015/ref_trace_decode_lib/ref_trace_decode_lib.sln create mode 100644 decoder/build/win-vs2015/ref_trace_decode_lib/ref_trace_decode_lib.vcxproj create mode 100644 decoder/build/win-vs2015/ref_trace_decode_lib/ref_trace_decode_lib.vcxproj.filters create mode 100644 decoder/docs/external_custom.md create mode 100644 decoder/docs/specs/ARM Trace and Debug Snapshot file format 0v2.pdf create mode 100644 decoder/include/c_api/ocsd_c_api_cust_fact.h create mode 100644 decoder/include/c_api/ocsd_c_api_cust_impl.h create mode 100644 decoder/include/c_api/ocsd_c_api_custom.h create mode 100644 decoder/include/ocsd_if_version.h create mode 100644 decoder/include/stm/trc_pkt_decode_stm.h create mode 100644 decoder/source/c_api/ocsd_c_api_custom_obj.cpp create mode 100644 decoder/source/c_api/ocsd_c_api_custom_obj.h create mode 100644 decoder/source/stm/trc_pkt_decode_stm.cpp create mode 100644 decoder/tests/build/linux/echo_test_dcd_lib/makefile create mode 100644 decoder/tests/build/win-vs2015/c_api_pkt_print_test/c_api_pkt_print_test.vcxproj create mode 100644 decoder/tests/build/win-vs2015/c_api_pkt_print_test/c_api_pkt_print_test.vcxproj.filters create mode 100644 decoder/tests/build/win-vs2015/ext_dcd_echo_test/ext_dcd_echo_test.vcxproj create mode 100644 decoder/tests/build/win-vs2015/ext_dcd_echo_test/ext_dcd_echo_test.vcxproj.filters create mode 100644 decoder/tests/build/win-vs2015/simple_pkt_print_c_api/simple_pkt_print_c_api.vcxproj create mode 100644 decoder/tests/build/win-vs2015/simple_pkt_print_c_api/simple_pkt_print_c_api.vcxproj.filters create mode 100644 decoder/tests/build/win-vs2015/snapshot_parser_lib/snapshot_parser_lib.vcxproj create mode 100644 decoder/tests/build/win-vs2015/snapshot_parser_lib/snapshot_parser_lib.vcxproj.filters create mode 100644 decoder/tests/build/win-vs2015/trc_pkt_lister/trc_pkt_lister.vcxproj create mode 100644 decoder/tests/build/win-vs2015/trc_pkt_lister/trc_pkt_lister.vcxproj.filters create mode 100644 decoder/tests/ext_dcd_test_eg/c_api_echo_test/ext_dcd_echo_test.c create mode 100644 decoder/tests/ext_dcd_test_eg/c_api_echo_test/ext_dcd_echo_test.h create mode 100644 decoder/tests/ext_dcd_test_eg/c_api_echo_test/ext_dcd_echo_test_fact.c create mode 100644 decoder/tests/ext_dcd_test_eg/c_api_echo_test/ext_dcd_echo_test_fact.h -- 2.7.4

8 years, 5 months

[PATCH 1/1] opencsd: C-API function declaration fix for perf build.

by Mike Leach

Changed ocsd_deregister_decoders() to ocsd_deregister_decoders(void) to comply with strict build rules in perf tools. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- decoder/include/c_api/opencsd_c_api.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/decoder/include/c_api/opencsd_c_api.h b/decoder/include/c_api/opencsd_c_api.h index 798551b..0fee736 100644 --- a/decoder/include/c_api/opencsd_c_api.h +++ b/decoder/include/c_api/opencsd_c_api.h @@ -403,7 +403,7 @@ OCSD_C_API ocsd_err_t ocsd_register_custom_decoder(const char *name, ocsd_extern @return ocsd_err_t : Library error code - RCDTL_OK if successful. */ -OCSD_C_API ocsd_err_t ocsd_deregister_decoders(); +OCSD_C_API ocsd_err_t ocsd_deregister_decoders(void); /** Get a string representation of a custom protocol packet. -- 2.7.4

8 years, 5 months

[PATCH 1/1] cs-etm: Update to perf cs-etm decoder for OpenCSD v0.5

by Mike Leach

Adds additional generic packet types to switch statement in decoder to ensure compilation without errors. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> --- tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c index e4c929e..71f5497 100644 --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c @@ -201,6 +201,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( case OCSD_GEN_TRC_ELEM_CYCLE_COUNT: case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN: case OCSD_GEN_TRC_ELEM_EVENT: + case OCSD_GEN_TRC_ELEM_SWTRACE: + case OCSD_GEN_TRC_ELEM_CUSTOM: default: break; } -- 2.7.4

8 years, 5 months

Re: using ETM for "perf record -b"

by Mathieu Poirier

On 11 November 2016 at 08:32, Sebastian Pop <sebpop(a)gmail.com> wrote: > Salut Matthieu, Bon matin, > > I was following your patches to enable ETM support in the linux kernel > last years, and I have just seen that you have a very nice blog on how > to use perf record to gather execution traces. Depending on the source you have read the information may be outdated. Nowadays the very latest instructions can be found in the HOWTO.md on the OpenCSD repository [1]. That documentation is maintained regularly and is considered accurate. [1]. https://github.com/Linaro/OpenCSD/tree/opencsd-0v003 > I am mainly interested to use this mechanism to enable collection of > traces with "perf record -b" like Intel's Last Branch Record: this is > used by AutoFDO in the compiler to know which code paths are hot and > enable better inlining, register allocation, and code layout: > http://research.google.com/pubs/pub45290.html This looks interesting. > > I am interested to work with you to enable "perf record -b" on aarch64. This is a sizeable project that will keep you occupied for a little while :o) I am happy to give guidance and review patches. Some people on the CoreSight mailing list (CC'ed here) are very proficient with the CoreSight tracers and can help understand the more complex features of the IP. I suggest CC'ing the list if/when you have questions. Best regards, Mathieu > > Thanks, > Sebastian

8 years, 5 months

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

by Mathieu Poirier

> ---------- 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 >

8 years, 5 months

Re: Linux Coresight driver question

by Mathieu Poirier

On 8 November 2016 at 12:27, Darius-Andrei Suciu <dsuciu(a)cs.stonybrook.edu> wrote: > Hello Mathieu, Hi > > My name is Darius Suciu, a Phd. student at Stony Brook University. Congratulation - a PhD is a serious endeavour. > I am > working on a project where I need to get tracing data from an Cortex A-9 cpu > (I'm using an i.MX6 nitrogen max board). The Coresight architecure seems > very complex to me. CS is complex to anyone ramping up on it. Looking at the drivers in the kernel tree most of the complexity comes from the integration with perf. The drivers and the framework are pretty bare bone and the sysFS interface very easy to understand. > I am trying to figure out how I can read the ETB buffer > from the kernel (without using a JTAG), and the Coresight driver seems to > offer this functionality. > On the comments on the Linux Coresight driver, it says it supports also PTM > (even though the configuration seems mostly ETM specific). In terms of configuration ETMv3 and PTM are quite similar. So far I haven't found enough discrepancies that would mandate splitting the ETMv3 driver. > Could you please help me out with some questions? Of course. > > Did you using the driver on a Cortex A-9 cpu ? Or do you know what changes > are required to make it work ? I never used CS on a cortex A9 but that is irrelevant. What is important is the kind of tracer (ETMv3/4/PTM) that is coupled with each CPU and we have support for all of them (except ITM). From there you'll need to take care of the power domains, clock and the device tree. > Do you know if the ETB buffer configuration is the same for ETM and PTM > architectures (can I reuse it) ETB and the ETM/PTM are different IP blocks and don't affect each other. The current ETB driver in the kernel tree will work with any kind of tracer. Mathieu > > Thank you for the help, > Darius >

8 years, 5 months

perf with CoreSight and OpenCSD on TC2 and Juno r2

by Yan Lin Aung

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. Thanx. Regards,Yan Lin Aung

8 years, 6 months

Re: CoreSight support in qemu

by Mathieu Poirier

On 15 October 2016 at 17:03, Miki Shifman <mikish(a)gmail.com> wrote: > Great, thanks! > Does Raspberry PI 2/3 also support CoreSight? And if it is, Does a DT exists > for it? (They're based on BCM2836 that contains Cortex-A7/BCM2837 that > contains Cortex-A53 respectively). All "A" class processor have coresight support. I haven't worked with the RPi 2/3 but I know Broadcom isn't very forthcoming with the device addresses and power domain configuration. The debug power domain may already be enabled... but it's doubtful. > > > On Oct 15, 2016 10:57 PM, "Mathieu Poirier" <mathieu.poirier(a)linaro.org> > wrote: >> >> On 15 October 2016 at 10:58, Miki Shifman <mikish(a)gmail.com> wrote: >> > Thanks a lot! >> > Just to make sure - Does the 410c like in that link contains CoreSight >> > HW >> > out of the box? >> >> Yes, that's the one. >> >> I can't say it's "out of the box" but pretty close. If it doesn't >> work on mainline Chunyan can tell you the patches/branch she used. >> >> Mathieu >> >> > >> > On Fri, Oct 14, 2016 at 8:17 PM, Mathieu Poirier >> > <mathieu.poirier(a)linaro.org> wrote: >> >> >> >> Hello Miki, >> >> >> >> On 14 October 2016 at 03:59, Miki Shifman <mikish(a)gmail.com> wrote: >> >> > Hi Mathieu, >> >> > >> >> > I'm been reading your tutorials about CoreSight and they're all very >> >> > interesting! I would appreciate your assistance with issues I have >> >> > with >> >> > it. >> >> > >> >> > I'm trying to learn how to use CoreSight, and currently I don't have >> >> > an >> >> > ARM >> >> > board supporting it, so i'm attempting to build a linux on qemu to >> >> > use >> >> > your >> >> > libraries. >> >> >> >> I have never heard about Coresight IP blocks being emulated on qemu - >> >> I'm not even sure it would be possible to do so. >> >> >> >> > >> >> > I've built linaro kernel 16.09 (latest) with CoreSight support. When >> >> > I'm >> >> > running qemu, I have sys/kernel/debug/coresight directory, but no >> >> > devices in >> >> > it, so I guess haven't been registered probably >> >> >> >> Right, that's because coresight entries aren't in the DT and as I said >> >> above, coresight blocks aren't emulated. >> >> >> >> I've heard of people thinking about providing an emulation but that >> >> would cause serious performance problems, at least from where I stand. >> >> >> >> Your best bet is to get one of the 96 board development kit, the 410c >> >> is probably best, and work with that. Of all the boards available >> >> it's likely the easiest to work with (note that I haven't tried >> >> myself). If you do end up acquiring a system Chunyan Zhang can help >> >> you with the DT specification. >> >> >> >> Best of luck, >> >> Mathieu >> >> >> >> > >> >> > Is there any flag I should add to qemu execution to support >> >> > CoreSight? >> >> > maybe >> >> > add some device? >> >> > >> >> > Thanking you in advance, >> >> > Miki >> > >> >

8 years, 6 months

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

CoreSight