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Subject Line.
This patch set is to explore Coresight tracing data for postmortem
debugging. When kernel panic happens, the Coresight panic kdump can
help to save on-chip tracing data and tracer metadata into DRAM, later
relies on kdump and crash/perf tools to recovery tracing data for
"offline" analysis.
The documentation is important to understand the purpose of Coresight
panic kdump, the implementation of framework and usage. Patches 0001
and patch 0002 are used for creating new sub directory for placing
Coresight docs and add a new doc for Coresight panic kdump.
Patch 0003 introduces the simple panic kdump framework which provides
helper functions can be used by Coresight devices, and it registers
panic notifier for dump tracing data.
Patches 0004/0005 support panic kdump for ETB; Patch 0006 supports the
kdump for ETMv4.
This patch set has been reworked by following suggestions at Linaro
HKG18 connect (mainly suggestions from Mathieu, thanks a lot!), and
it's rebased on acme git tree [1] with last commit 109d59b900e7 ('perf
vendor events s390: Add JSON files for IBM z14').
Due Coresight kdump data structure has been changed significantly, the
corresponding crash extension program also has been updated for this
reason [2]; furthermore the crash extension program is updated to
dynamically generate kernel buildid according to vmlinux elf info [3],
this is a fixing for the old code which uses hard-coded buildid value.
This patch set has been verified on 96boards Hikey620 with Coresight
enabling by the sysFS interface. Also the updated crash extension
program has been verified to cowork with Coresight panic kdump and it
successfully extracts tracing data from the vmcore and finally can be
decoded by perf tool.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
[2] https://git.linaro.org/people/leo.yan/crash.git/tree/extensions/csdump.c
[3] https://git.linaro.org/people/leo.yan/crash.git/tree/extensions/csdump_buil…
Changes from v3:
* Following Mathieu suggestion, reworked the panic kdump framework,
used kdump array to maintain source and sink device handlers;
* According to Mathieu suggestion, optimized panic notifier to
firstly dump panic CPU tracing data and then dump other CPUs tracing
data;
* Refined doc to reflect these implementation changes;
* Changed ETMv4 driver to add source device handler at probe phase;
* Refactored crash extension program to reflect kernel changes.
Changes from v2:
* Add the two patches for documentation.
* Following Mathieu suggestion, reworked the panic kdump framework,
removed the useless flag "PRE_PANIC".
* According to comment, changed to add and delete kdump node operations
in sink enable/disable functions;
* According to Mathieu suggestion, handle kdump node
addition/deletion/updating separately for sysFS interface and perf
method.
Changes from v1:
* Add support to dump ETMv4 meta data.
* Wrote 'crash' extension csdump.so so rely on it to generate 'perf'
format compatible file.
* Refactored panic dump driver to support pre & post panic dump.
Changes from RFC:
* Follow Mathieu's suggestion, use general framework to support dump
functionality.
* Changed to use perf to analyse trace data.
Leo Yan (6):
doc: Add Coresight documentation directory
doc: Add documentation for Coresight panic kdump
coresight: Support panic kdump functionality
coresight: tmc: Hook callback for panic kdump
coresight: Set and clear sink device handler for kdump node
coresight: etm4x: Support panic kdump
Documentation/trace/coresight-cpu-debug.txt | 187 ----------
Documentation/trace/coresight.txt | 383 ---------------------
.../trace/coresight/coresight-cpu-debug.txt | 187 ++++++++++
.../trace/coresight/coresight-panic-kdump.txt | 130 +++++++
Documentation/trace/coresight/coresight.txt | 383 +++++++++++++++++++++
MAINTAINERS | 5 +-
drivers/hwtracing/coresight/Kconfig | 9 +
drivers/hwtracing/coresight/Makefile | 1 +
drivers/hwtracing/coresight/coresight-etm-perf.c | 5 +
drivers/hwtracing/coresight/coresight-etm4x.c | 27 ++
drivers/hwtracing/coresight/coresight-etm4x.h | 15 +
.../hwtracing/coresight/coresight-panic-kdump.c | 199 +++++++++++
drivers/hwtracing/coresight/coresight-priv.h | 12 +
drivers/hwtracing/coresight/coresight-tmc-etf.c | 30 ++
drivers/hwtracing/coresight/coresight.c | 16 +-
include/linux/coresight.h | 4 +
16 files changed, 1019 insertions(+), 574 deletions(-)
delete mode 100644 Documentation/trace/coresight-cpu-debug.txt
delete mode 100644 Documentation/trace/coresight.txt
create mode 100644 Documentation/trace/coresight/coresight-cpu-debug.txt
create mode 100644 Documentation/trace/coresight/coresight-panic-kdump.txt
create mode 100644 Documentation/trace/coresight/coresight.txt
create mode 100644 drivers/hwtracing/coresight/coresight-panic-kdump.c
--
2.7.4
This allows modules to match struct device.bus to amba_bustype for the
purpose of casting the device to an amba_device with to_amba_device().
Cc: Alex Williamson <alex.williamson(a)redhat.com>
Cc: Eric Auger <eric.auger(a)redhat.com>
Cc: Russell King <linux(a)armlinux.org.uk>
[RESEND due to new coresight modularization dependency]
Signed-off-by: Kim Phillips <kim.phillips(a)arm.com>
---
Reviving https://lkml.org/lkml/2017/6/20/682, since it's needed by
CoreSight modularization, and I can't tell what fate the original
version had.
drivers/amba/bus.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 594c228d2f02..12283bd06733 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -197,6 +197,7 @@ struct bus_type amba_bustype = {
.pm = &amba_pm,
.force_dma = true,
};
+EXPORT_SYMBOL_GPL(amba_bustype);
static int __init amba_init(void)
{
--
2.16.2
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Greetings, i was referred to this mailing list by Mathleu Poirler.
I'm recording Coresight using my Dragonboard 410c board, after compiling
the perf-opencsd-master kernel.
Recording seems to work on a simple program i did which does nothing but
print a string to the screen.
Now, i use perf to hopefully decode the trace, but perf segfaults. I'll let
you know that decoding using the sample trace given here:
https://github.com/Linaro/OpenCSD/blob/master/HOWTO.md
Does work.
I dived into the cs-trace-disasm.py script to see why exactly it doesn't
work and i noticed this command causes the segfault:
$ ~/linux/tools/perf/perf script --show-mmap-events
/lib/aarch64-linux-gnu/ld-2.26.so with build id
6516ef8fa13fcb739834af9e87fb5fe9df612096 not found, con>
Segmentation fault (core dumped)
This command also segfaults:
$ ~/linux/tools/perf/perf report --stdio
/lib/aarch64-linux-gnu/ld-2.26.so with build id
6516ef8fa13fcb739834af9e87fb5fe9df612096 not found, con>
(END)Segmentation fault (core dumped)
But this command works:
$ ~/linux/tools/perf/perf report --stdio --dump
And i can see Coresight packets information when browsing the output.
My .debug directory looks like this:
~/.debug/
|-- [kernel.kallsyms]
| `-- 1dc43d23817467d7717b19af07463af0d9a9bd83
| `-- kallsyms
|-- [vdso]
| `-- 18863444e4f3e2600f53e406421b2a0edd940888
| `-- vdso
|-- bin
| `-- check
| `-- 31694f29996e06da12f63d6088ec6eb23b3079c4
| `-- elf
`-- lib
`-- aarch64-linux-gnu
|-- ld-2.26.so
| `-- 6516ef8fa13fcb739834af9e87fb5fe9df612096
| `-- elf
`-- libc.so.6
`-- 06e99d8d6acabab0643e0f525ac561cf73db6498
`-- elf
Now, another need i wanted to ask is where can i find the code that uses
OpenCSD to decode the trace and output instructions? eventually, i don't
want to use perf, but rather use OpenCSD directly in my code to decode
traces.
Not sure what to do here and how to proceed, i'll appreciate some help.
Thank you all!
Hi,
Would you be interested in Power Lunix users for your email marketing campaign? We provide the Database across North America, EMEA, APAC and Latin America.
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Thanks & regards,
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Good day to all,
The CS specification defines replicators that are not showing on the
AMBA bus and can't be configured - they simply provide a hard wire
between components. Earlier this week someone wrote to me on the open
mailing list asking for guidance in dealing with a new type of funnel
their company has introduced in a design. Just like a replicator it
doesn't show up on the AMBA bus and can't be configured.
It makes sense to deal with this new component the same way we do with
the above-mentioned replicator, i.e use a platform driver that does
nothing and add it to the CS topology when specified in the device
tree. It also make sense to re-use the same code [1] for that.
But moving forward with this also means we need to re-brand the
current coresight-replicator.c file, along with adding new
"compatible" strings. Here is what I suggest:
1) Keep the "arm,coresight-replicator" compatible string for backward
compatibility (I'm seriously tempted not to [2]).
2) Add a new "arm,coresight-hw-replicator" compatible string for
replicators that don't show up on the AMBA bus.
3) Add a new "arm,coresight-hw-funnel" compatible string for funnels
that don't show up on the AMBA bus.
4) Use a match table to deal with the above two new compatible string
and the old one (if we keep it around).
5) Rename coresight-replicator.c to coresight-hw-link.c.
I'm reaching out to the list because once we have a naming convention
it is hard to modify it. Let me know what you think of the above.
Thanks,
Mathieu
[1]. https://elixir.bootlin.com/linux/latest/source/drivers/hwtracing/coresight/…
[2]. We could also delete the old "arm,coresight-replicator" and make
the changes in the DT for current users. People that haven't upstream
their in-house solution will have to adapt, but that's something that
happens with all the out-of-tree code.
Hi Zhi,
On 7 March 2018 at 08:57, Zhi Li <lznuaa(a)gmail.com> wrote:
> Mathieu:
>
> I am working one enable coresight in our SOC.
>
> But our SOC's cluster funnel have not export program interface.
> Our cluster included 4 A53.
>
> 4 ETM of A53 connect to funnel, which have NOT program
> interface. Funnel is default enabled.
>
> Do you have suggest how to bypass or use dummy funnel in dts file?
Is the funnel discoverable on the AMBA bus or is it like the original
version of replicators?
>
>
> best regards
> Frank Li
* Arnaldo Carvalho de Melo <acme(a)kernel.org> wrote:
> Hi Ingo,
>
> Please consider pulling, this is on top of tip/perf/urgent.
>
> - Arnaldo
>
> Test results at the end of this message, as usual.
>
> The following changes since commit 297f9233b53a08fd457815e19f1d6f2c3389857b:
>
> kprobes: Propagate error from disarm_kprobe_ftrace() (2018-02-16 09:12:58 +0100)
>
> are available in the Git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo-4.17-20180216
>
> for you to fetch changes up to 21316ac6803d4a1aadd74b896db8d60a92cd1140:
>
> perf tests shell lib: Use a wildcard to remove the vfs_getname probe (2018-02-16 15:31:12 -0300)
>
> ----------------------------------------------------------------
> perf/core improvements and fixes:
>
> - Fix wrong jump arrow in systems with branch records with cycles,
> i.e. Intel's >= Skylake (Jin Yao)
>
> - Fix 'perf record --per-thread' problem introduced when
> implementing 'perf stat --per-thread (Jin Yao)
>
> - Use arch__compare_symbol_names() to fix 'perf test vmlinux',
> that was using strcmp(symbol names) while the dso routines
> doing symbol lookups used the arch overridable one, making
> this test fail in architectures that overrided that function
> with something other than strcmp() (Jiri Olsa)
>
> - Add 'perf script --show-round-event' to display
> PERF_RECORD_FINISHED_ROUND entries (Jiri Olsa)
>
> - Fix dwarf unwind for stripped binaries in 'perf test' (Jiri Olsa)
>
> - Use ordered_events for 'perf report --tasks', otherwise we may get
> artifacts when PERF_RECORD_FORK gets processed before PERF_RECORD_COMM
> (when they got recorded in different CPUs) (Jiri Olsa)
>
> - Add support to display group output for non group events, i.e.
> now when one uses 'perf report --group' on a perf.data file
> recorded without explicitly grouping events with {} (e.g.
> "perf record -e '{cycles,instructions}'" get the same output
> that would produce, i.e. see all those non-grouped events in
> multiple columns, at the same time (Jiri Olsa)
>
> - Skip non-address kallsyms entries, e.g. '(null)' for !root (Jiri Olsa)
>
> - Kernel maps fixes wrt perf.data(report) versus live system (top)
> (Jiri Olsa)
>
> - Fix memory corruption when using 'perf record -j call -g -a <application>'
> followed by 'perf report --branch-history' (Jiri Olsa)
>
> - ARM CoreSight fixes (Mathieu Poirier)
>
> - Add inject capability for CoreSight Traces (Robert Waker)
>
> - Update documentation for use of 'perf' + ARM CoreSight (Robert Walker)
>
> - Man pages fixes (Sangwon Hong, Jaecheol Shin)
>
> - Fix some 'perf test' cases on s/390 and x86_64 (some backtraces
> changed with a glibc update) (Thomas Richter)
>
> - Add detailed CPUID info in the 'perf.data' headers for s/390 to
> then use it in 'perf annotate' (Thomas Richter)
>
> - Add '--interval-count N' to 'perf stat', to use with -I, i.e.
> 'perf stat -I 1000 --interval-count 2' will show stats every
> 1000ms, two times (yuzhoujian)
>
> - Add 'perf stat --timeout Nms', that will run for that many
> milliseconds and then stop, printing the counters (yuzhoujian)
>
> - Fix description for 'perf report --mem-modex (Andi Kleen)
>
> - Use a wildcard to remove the vfs_getname probe in the
> 'perf test' shell based test cases (Arnaldo Carvalho de Melo)
>
> Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com>
>
> ----------------------------------------------------------------
> Andi Kleen (1):
> perf report: Fix description for --mem-mode
>
> Arnaldo Carvalho de Melo (1):
> perf tests shell lib: Use a wildcard to remove the vfs_getname probe
>
> Jaecheol Shin (1):
> perf annotate: Add missing arguments in Man page
>
> Jin Yao (2):
> perf tools: Use target->per_thread and target->system_wide flags
> perf report: Fix wrong jump arrow
>
> Jiri Olsa (18):
> perf record: Put new line after target override warning
> perf script: Add --show-round-event to display PERF_RECORD_FINISHED_ROUND
> tools lib api fs: Add filename__read_xll function
> tools lib api fs: Add sysfs__read_xll function
> perf tests: Fix dwarf unwind for stripped binaries
> perf tools: Fix comment for sort__* compare functions
> perf report: Ask for ordered events for --tasks option
> perf report: Add support to display group output for non group events
> tools lib symbol: Skip non-address kallsyms line
> perf symbols: Check if we read regular file in dso__load()
> perf machine: Free root_dir in machine__init() error path
> perf machine: Move kernel mmap name into struct machine
> perf machine: Generalize machine__set_kernel_mmap()
> perf machine: Don't search for active kernel start in __machine__create_kernel_maps
> perf machine: Remove machine__load_kallsyms()
> perf tools: Do not create kernel maps in sample__resolve()
> perf tests: Use arch__compare_symbol_names to compare symbols
> perf report: Fix memory corruption in --branch-history mode --branch-history
>
> Mathieu Poirier (3):
> perf cs-etm: Freeing allocated memory
> perf auxtrace arm: Fixing uninitialised variable
> perf cs-etm: Properly deal with cpu maps
>
> Ravi Bangoria (3):
> tools include powerpc: Grab a copy of arch/powerpc/include/uapi/asm/unistd.h
> perf powerpc: Generate system call table from asm/unistd.h
> perf trace powerpc: Use generated syscall table
>
> Robert Walker (3):
> perf cs-etm: Inject capabilitity for CoreSight traces
> perf inject: Emit instruction records on ETM trace discontinuity
> coresight: Update documentation for perf usage
>
> Sangwon Hong (2):
> perf kmem: Document a missing option & an argument
> perf mem: Document a missing option
>
> Thomas Richter (5):
> perf record: Provide detailed information on s390 CPU
> perf annotate: Scan cpuid for s390 and save machine type
> perf cpuid: Introduce a platform specific cpuid compare function
> perf test: Fix test case 23 for s390 z/VM or KVM guests
> perf test: Fix test case inet_pton to accept inlines.
>
> yuzhoujian (2):
> perf stat: Add support to print counts for fixed times
> perf stat: Add support to print counts after a period of time
>
> Documentation/trace/coresight.txt | 51 +++
> tools/arch/powerpc/include/uapi/asm/unistd.h | 402 +++++++++++++++++
> tools/lib/api/fs/fs.c | 44 +-
> tools/lib/api/fs/fs.h | 2 +
> tools/lib/symbol/kallsyms.c | 4 +
> tools/perf/Documentation/perf-annotate.txt | 6 +-
> tools/perf/Documentation/perf-kmem.txt | 6 +-
> tools/perf/Documentation/perf-mem.txt | 4 +
> tools/perf/Documentation/perf-report.txt | 5 +-
> tools/perf/Documentation/perf-script.txt | 3 +
> tools/perf/Documentation/perf-stat.txt | 10 +
> tools/perf/Makefile.config | 2 +
> tools/perf/arch/arm/util/auxtrace.c | 2 +-
> tools/perf/arch/arm/util/cs-etm.c | 51 ++-
> tools/perf/arch/powerpc/Makefile | 25 ++
> .../perf/arch/powerpc/entry/syscalls/mksyscalltbl | 37 ++
> tools/perf/arch/s390/annotate/instructions.c | 27 +-
> tools/perf/arch/s390/util/header.c | 148 ++++++-
> tools/perf/builtin-record.c | 2 +-
> tools/perf/builtin-report.c | 7 +-
> tools/perf/builtin-script.c | 17 +
> tools/perf/builtin-stat.c | 53 ++-
> tools/perf/check-headers.sh | 1 +
> tools/perf/tests/code-reading.c | 33 +-
> tools/perf/tests/dwarf-unwind.c | 46 +-
> tools/perf/tests/shell/lib/probe_vfs_getname.sh | 2 +-
> .../perf/tests/shell/trace+probe_libc_inet_pton.sh | 6 +-
> tools/perf/tests/vmlinux-kallsyms.c | 4 +-
> tools/perf/ui/browsers/annotate.c | 9 +-
> tools/perf/util/build-id.c | 10 +-
> tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 74 +++-
> tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 2 +
> tools/perf/util/cs-etm.c | 478 ++++++++++++++++++---
> tools/perf/util/event.c | 16 +-
> tools/perf/util/evlist.c | 21 +-
> tools/perf/util/header.h | 1 +
> tools/perf/util/hist.c | 4 +-
> tools/perf/util/hist.h | 1 -
> tools/perf/util/machine.c | 145 +++----
> tools/perf/util/machine.h | 6 +-
> tools/perf/util/pmu.c | 47 +-
> tools/perf/util/sort.c | 7 +-
> tools/perf/util/stat.h | 2 +
> tools/perf/util/symbol.c | 13 +-
> tools/perf/util/syscalltbl.c | 8 +
> tools/perf/util/thread_map.c | 4 +-
> tools/perf/util/thread_map.h | 2 +-
> 47 files changed, 1577 insertions(+), 273 deletions(-)
> create mode 100644 tools/arch/powerpc/include/uapi/asm/unistd.h
> create mode 100755 tools/perf/arch/powerpc/entry/syscalls/mksyscalltbl
Pulled, thanks a lot Arnaldo!
Ingo
