[PATCH v9 0/4] perf tools: add support for libpfm4

[Ian Rogers]

This patch links perf with the libpfm4 library if it is available
and NO_LIBPFM4 isn't passed to the build. The libpfm4 library
contains hardware event tables for all processors supported by
perf_events. It is a helper library that helps convert from a
symbolic event name to the event encoding required by the
underlying kernel interface. This library is open-source and
available from: http://perfmon2.sf.net.
    
With this patch, it is possible to specify full hardware events
by name. Hardware filters are also supported. Events must be
specified via the --pfm-events and not -e option. Both options
are active at the same time and it is possible to mix and match:
    
$ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles ....

v9 removes some unnecessary #ifs.
v8 addresses review comments from jolsa@xxxxxxxxxxx
   Breaks the patch into 4, adds a test and moves the libpfm code into its
   own file. perf list encoding tries to be closer to existing:
...
skx pfm-events
  UNHALTED_CORE_CYCLES
    [Count core clock cycles whenever the clock signal on the specific ...
  UNHALTED_REFERENCE_CYCLES
    [Unhalted reference cycles]
  INSTRUCTION_RETIRED
    [Number of instructions at retirement]
  INSTRUCTIONS_RETIRED
    [This is an alias for INSTRUCTION_RETIRED]
  BRANCH_INSTRUCTIONS_RETIRED
    [Count branch instructions at retirement. Specifically, this event ...
  MISPREDICTED_BRANCH_RETIRED
    [Count mispredicted branch instructions at retirement. ...
  BACLEARS
    [Branch re-steered]
      BACLEARS:ANY
        [Number of front-end re-steers due to BPU misprediction]
  BR_INST_RETIRED
    [Branch instructions retired (Precise Event)]
      BR_INST_RETIRED:CONDITIONAL
        [Counts all taken and not taken macro conditional branch ...
...
  and supports --long-desc/-v:
...
  BACLEARS
    [Branch re-steered]
      Code  : 0xe6
      BACLEARS:ANY
        [Number of front-end re-steers due to BPU misprediction]
        Umask : 0x01 : PMU: [default] 
      Modif : PMU: [e] : edge level (may require counter-mask >= 1) ...
      Modif : PMU: [i] : invert (boolean)
      Modif : PMU: [c] : counter-mask in range [0-255] (integer)
      Modif : PMU: [t] : measure any thread (boolean)
      Modif : PMU: [intx] : monitor only inside transactional memory ...
      Modif : PMU: [intxcp] : do not count occurrences inside aborted ...
      Modif : perf_event: [u] : monitor at user level (boolean)
      Modif : perf_event: [k] : monitor at kernel level (boolean)
      Modif : perf_event: [period] : sampling period (integer)
      Modif : perf_event: [freq] : sampling frequency (Hz) (integer)
      Modif : perf_event: [excl] : exclusive access (boolean)
      Modif : perf_event: [mg] : monitor guest execution (boolean)
      Modif : perf_event: [mh] : monitor host execution (boolean)
      Modif : perf_event: [cpu] : CPU to program (integer)
      Modif : perf_event: [pinned] : pin event to counters (boolean)
  BR_INST_RETIRED
    [Branch instructions retired (Precise Event)]
      Code  : 0xc4
      BR_INST_RETIRED:CONDITIONAL
        [Counts all taken and not taken macro conditional branch ...
        Umask : 0x01 : PMU: [precise]

v7 rebases and adds fallback code for libpfm4 events.
   The fallback code is to force user only priv level in case the
   perf_event_open() syscall failed for permissions reason.
   the fallback forces a user privilege level restriction on the event
   string, so depending on the syntax either u or :u is needed.
    
   But libpfm4 can use a : or . as the separator, so simply searching
   for ':' vs. '/' is not good enough to determine the syntax needed.
   Therefore, this patch introduces a new evsel boolean field to mark
   events coming from  libpfm4. The field is then used to adjust the
   fallback string.
v6 was a rebase.
v5 was a rebase.
v4 was a rebase on
   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
   branch perf/core and re-adds the tools/build/feature/test-libpfm4.c
   missed in v3.
v3 is against acme/perf/core and removes a diagnostic warning.
v2 of this patch makes the --pfm-events man page documentation
   conditional on libpfm4 behing configured. It tidies some of the
   documentation and adds the feature test missed in the v1 patch.

Ian Rogers (1):
  perf doc: allow ASCIIDOC_EXTRA to be an argument

Stephane Eranian (3):
  tools feature: add support for detecting libpfm4
  perf pmu: add perf_pmu__find_by_type helper
  perf tools: add support for libpfm4

 tools/build/Makefile.feature             |   3 +-
 tools/build/feature/Makefile             |   6 +-
 tools/build/feature/test-libpfm4.c       |   9 +
 tools/perf/Documentation/Makefile        |   4 +-
 tools/perf/Documentation/perf-record.txt |  11 +
 tools/perf/Documentation/perf-stat.txt   |  10 +
 tools/perf/Documentation/perf-top.txt    |  11 +
 tools/perf/Makefile.config               |  12 +
 tools/perf/Makefile.perf                 |   6 +-
 tools/perf/builtin-list.c                |  12 +-
 tools/perf/builtin-record.c              |  11 +
 tools/perf/builtin-stat.c                |   8 +
 tools/perf/builtin-top.c                 |   8 +
 tools/perf/tests/Build                   |   1 +
 tools/perf/tests/builtin-test.c          |   9 +
 tools/perf/tests/pfm.c                   | 207 +++++++++++++++++
 tools/perf/tests/tests.h                 |   3 +
 tools/perf/util/Build                    |   2 +
 tools/perf/util/evsel.c                  |   2 +-
 tools/perf/util/evsel.h                  |   1 +
 tools/perf/util/parse-events.c           |  30 ++-
 tools/perf/util/parse-events.h           |   4 +
 tools/perf/util/pfm.c                    | 277 +++++++++++++++++++++++
 tools/perf/util/pfm.h                    |  43 ++++
 tools/perf/util/pmu.c                    |  11 +
 tools/perf/util/pmu.h                    |   1 +
 26 files changed, 687 insertions(+), 15 deletions(-)
 create mode 100644 tools/build/feature/test-libpfm4.c
 create mode 100644 tools/perf/tests/pfm.c
 create mode 100644 tools/perf/util/pfm.c
 create mode 100644 tools/perf/util/pfm.h

-- 
2.26.0.110.g2183baf09c-goog