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Date:   Wed, 29 Apr 2020 09:59:47 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Igor Lubashev <ilubashe@...mai.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jiwei Sun <jiwei.sun@...driver.com>,
        yuzhoujian <yuzhoujian@...ichuxing.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.garry@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v6] perf tools: add support for libpfm4

On Wed, Apr 29, 2020 at 7:49 AM Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
>
> Em Wed, Apr 01, 2020 at 11:49:13AM -0700, Ian Rogers escreveu:
> > From: Stephane Eranian <eranian@...gle.com>
> >
> > 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
>
> Can we make this a explicit decision instead, i.e. for it to be linked
> we would need to have its development files installed and -DLIBPFM4,
> like we have for CORESIGHT?
>
>   $ grep CORESIGHT tools/perf/Makefile.perf
>   # Define CORESIGHT if you DO WANT support for CoreSight trace decoding.
>   $


Thanks Arnaldo, I'll do that.
Ian

> - Arnaldo
>
> > 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 ....
> >
> > v6 is a rebase.
> > v5 is a rebase.
> > v4 is 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.
> >
> > Reviewed-By:Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/build/Makefile.feature             |   6 +-
> >  tools/build/feature/Makefile             |   7 +-
> >  tools/build/feature/test-libpfm4.c       |   8 +
> >  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                |  16 ++
> >  tools/perf/builtin-record.c              |  20 ++
> >  tools/perf/builtin-stat.c                |  21 ++
> >  tools/perf/builtin-top.c                 |  20 ++
> >  tools/perf/util/evsel.c                  |   2 +-
> >  tools/perf/util/evsel.h                  |   1 +
> >  tools/perf/util/parse-events.c           | 246 +++++++++++++++++++++++
> >  tools/perf/util/parse-events.h           |   5 +
> >  tools/perf/util/pmu.c                    |  11 +
> >  tools/perf/util/pmu.h                    |   1 +
> >  19 files changed, 410 insertions(+), 8 deletions(-)
> >  create mode 100644 tools/build/feature/test-libpfm4.c
> >
> > diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> > index 574c2e0b9d20..08c6fe5aee2d 100644
> > --- a/tools/build/Makefile.feature
> > +++ b/tools/build/Makefile.feature
> > @@ -72,7 +72,8 @@ FEATURE_TESTS_BASIC :=                  \
> >          setns                                \
> >          libaio                               \
> >          libzstd                              \
> > -        disassembler-four-args
> > +        disassembler-four-args               \
> > +        libpfm4
> >
> >  # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
> >  # of all feature tests
> > @@ -127,7 +128,8 @@ FEATURE_DISPLAY ?=              \
> >           bpf                 \
> >           libaio                      \
> >           libzstd             \
> > -         disassembler-four-args
> > +         disassembler-four-args      \
> > +         libpfm4
> >
> >  # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
> >  # If in the future we need per-feature checks/flags for features not
> > diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> > index 7ac0d8088565..573072d32545 100644
> > --- a/tools/build/feature/Makefile
> > +++ b/tools/build/feature/Makefile
> > @@ -67,7 +67,9 @@ FILES=                                          \
> >           test-llvm.bin                               \
> >           test-llvm-version.bin                       \
> >           test-libaio.bin                     \
> > -         test-libzstd.bin
> > +         test-libzstd.bin                    \
> > +         test-libpfm4.bin
> > +
> >
> >  FILES := $(addprefix $(OUTPUT),$(FILES))
> >
> > @@ -321,6 +323,9 @@ $(OUTPUT)test-libaio.bin:
> >  $(OUTPUT)test-libzstd.bin:
> >       $(BUILD) -lzstd
> >
> > +$(OUTPUT)test-libpfm4.bin:
> > +     $(BUILD) -lpfm
> > +
> >  ###############################
> >
> >  clean:
> > diff --git a/tools/build/feature/test-libpfm4.c b/tools/build/feature/test-libpfm4.c
> > new file mode 100644
> > index 000000000000..7f24df86cf09
> > --- /dev/null
> > +++ b/tools/build/feature/test-libpfm4.c
> > @@ -0,0 +1,8 @@
> > +#include <sys/types.h>
> > +#include <perfmon/pfmlib.h>
> > +
> > +int main(void)
> > +{
> > +        pfm_initialize();
> > +        return 0;
> > +}
> > diff --git a/tools/perf/Documentation/Makefile b/tools/perf/Documentation/Makefile
> > index 31824d5269cc..6e54979c2124 100644
> > --- a/tools/perf/Documentation/Makefile
> > +++ b/tools/perf/Documentation/Makefile
> > @@ -48,7 +48,7 @@ man5dir=$(mandir)/man5
> >  man7dir=$(mandir)/man7
> >
> >  ASCIIDOC=asciidoc
> > -ASCIIDOC_EXTRA = --unsafe -f asciidoc.conf
> > +ASCIIDOC_EXTRA += --unsafe -f asciidoc.conf
> >  ASCIIDOC_HTML = xhtml11
> >  MANPAGE_XSL = manpage-normal.xsl
> >  XMLTO_EXTRA =
> > @@ -59,7 +59,7 @@ HTML_REF = origin/html
> >
> >  ifdef USE_ASCIIDOCTOR
> >  ASCIIDOC = asciidoctor
> > -ASCIIDOC_EXTRA = -a compat-mode
> > +ASCIIDOC_EXTRA += -a compat-mode
> >  ASCIIDOC_EXTRA += -I. -rasciidoctor-extensions
> >  ASCIIDOC_EXTRA += -a mansource="perf" -a manmanual="perf Manual"
> >  ASCIIDOC_HTML = xhtml5
> > diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> > index b3f3b3f1c161..ad2c41f595c2 100644
> > --- a/tools/perf/Documentation/perf-record.txt
> > +++ b/tools/perf/Documentation/perf-record.txt
> > @@ -596,6 +596,17 @@ Make a copy of /proc/kcore and place it into a directory with the perf data file
> >  Limit the sample data max size, <size> is expected to be a number with
> >  appended unit character - B/K/M/G
> >
> > +ifdef::HAVE_LIBPFM[]
> > +--pfm-events events::
> > +Select a PMU event using libpfm4 syntax (see http://perfmon2.sf.net)
> > +including support for event filters. For example '--pfm-events
> > +inst_retired:any_p:u:c=1:i'. More than one event can be passed to the
> > +option using the comma separator. Hardware events and generic hardware
> > +events cannot be mixed together. The latter must be used with the -e
> > +option. The -e option and this one can be mixed and matched.  Events
> > +can be grouped using the {} notation.
> > +endif::HAVE_LIBPFM[]
> > +
> >  SEE ALSO
> >  --------
> >  linkperf:perf-stat[1], linkperf:perf-list[1], linkperf:perf-intel-pt[1]
> > diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
> > index 4d56586b2fb9..536952ad592c 100644
> > --- a/tools/perf/Documentation/perf-stat.txt
> > +++ b/tools/perf/Documentation/perf-stat.txt
> > @@ -71,6 +71,16 @@ report::
> >  --tid=<tid>::
> >          stat events on existing thread id (comma separated list)
> >
> > +ifdef::HAVE_LIBPFM[]
> > +--pfm-events events::
> > +Select a PMU event using libpfm4 syntax (see http://perfmon2.sf.net)
> > +including support for event filters. For example '--pfm-events
> > +inst_retired:any_p:u:c=1:i'. More than one event can be passed to the
> > +option using the comma separator. Hardware events and generic hardware
> > +events cannot be mixed together. The latter must be used with the -e
> > +option. The -e option and this one can be mixed and matched.  Events
> > +can be grouped using the {} notation.
> > +endif::HAVE_LIBPFM[]
> >
> >  -a::
> >  --all-cpus::
> > diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
> > index 487737a725e9..9858e3640b0c 100644
> > --- a/tools/perf/Documentation/perf-top.txt
> > +++ b/tools/perf/Documentation/perf-top.txt
> > @@ -319,6 +319,17 @@ Default is to monitor all CPUS.
> >       go straight to the histogram browser, just like 'perf top' with no events
> >       explicitely specified does.
> >
> > +ifdef::HAVE_LIBPFM[]
> > +--pfm-events events::
> > +Select a PMU event using libpfm4 syntax (see http://perfmon2.sf.net)
> > +including support for event filters. For example '--pfm-events
> > +inst_retired:any_p:u:c=1:i'. More than one event can be passed to the
> > +option using the comma separator. Hardware events and generic hardware
> > +events cannot be mixed together. The latter must be used with the -e
> > +option. The -e option and this one can be mixed and matched.  Events
> > +can be grouped using the {} notation.
> > +endif::HAVE_LIBPFM[]
> > +
> >
> >  INTERACTIVE PROMPTING KEYS
> >  --------------------------
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index 80e55e796be9..571aa6b1af40 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -999,6 +999,18 @@ ifdef LIBCLANGLLVM
> >    endif
> >  endif
> >
> > +ifndef NO_LIBPFM4
> > +  ifeq ($(feature-libpfm4), 1)
> > +    CFLAGS += -DHAVE_LIBPFM
> > +    EXTLIBS += -lpfm
> > +    ASCIIDOC_EXTRA = -aHAVE_LIBPFM=1
> > +    $(call detected,CONFIG_LIBPFM4)
> > +  else
> > +    msg := $(warning libpfm4 not found, disables libpfm4 support. Please install libpfm4-dev);
> > +    NO_LIBPFM4 := 1
> > +  endif
> > +endif
> > +
> >  # Among the variables below, these:
> >  #   perfexecdir
> >  #   perf_include_dir
> > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> > index d15a311408f1..9787eb3ca0a9 100644
> > --- a/tools/perf/Makefile.perf
> > +++ b/tools/perf/Makefile.perf
> > @@ -118,6 +118,8 @@ include ../scripts/utilities.mak
> >  #
> >  # Define LIBBPF_DYNAMIC to enable libbpf dynamic linking.
> >  #
> > +# Define NO_LIBPFM4 to disable libpfm4 extension.
> > +#
> >
> >  # As per kernel Makefile, avoid funny character set dependencies
> >  unexport LC_ALL
> > @@ -188,7 +190,7 @@ AWK     = awk
> >  # non-config cases
> >  config := 1
> >
> > -NON_CONFIG_TARGETS := clean python-clean TAGS tags cscope help install-doc install-man install-html install-info install-pdf doc man html info pdf
> > +NON_CONFIG_TARGETS := clean python-clean TAGS tags cscope help
> >
> >  ifdef MAKECMDGOALS
> >  ifeq ($(filter-out $(NON_CONFIG_TARGETS),$(MAKECMDGOALS)),)
> > @@ -832,7 +834,7 @@ INSTALL_DOC_TARGETS += quick-install-doc quick-install-man quick-install-html
> >
> >  # 'make doc' should call 'make -C Documentation all'
> >  $(DOC_TARGETS):
> > -     $(Q)$(MAKE) -C $(DOC_DIR) O=$(OUTPUT) $(@:doc=all)
> > +     $(Q)$(MAKE) -C $(DOC_DIR) O=$(OUTPUT) $(@:doc=all) ASCIIDOC_EXTRA=$(ASCIIDOC_EXTRA)
> >
> >  TAG_FOLDERS= . ../lib ../include
> >  TAG_FILES= ../../include/uapi/linux/perf_event.h
> > diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> > index 965ef017496f..5edeb428168a 100644
> > --- a/tools/perf/builtin-list.c
> > +++ b/tools/perf/builtin-list.c
> > @@ -18,6 +18,10 @@
> >  #include <subcmd/parse-options.h>
> >  #include <stdio.h>
> >
> > +#ifdef HAVE_LIBPFM
> > +#include <perfmon/pfmlib.h>
> > +#endif
> > +
> >  static bool desc_flag = true;
> >  static bool details_flag;
> >
> > @@ -56,6 +60,18 @@ int cmd_list(int argc, const char **argv)
> >       if (!raw_dump && pager_in_use())
> >               printf("\nList of pre-defined events (to be used in -e):\n\n");
> >
> > +#ifdef HAVE_LIBPFM
> > +     {
> > +             int ret;
> > +             ret = pfm_initialize();
> > +             if (ret != PFM_SUCCESS) {
> > +                     fprintf(stderr,
> > +                             "warning libpfm failed to initialize: %s\n",
> > +                             pfm_strerror(ret));
> > +             }
> > +     }
> > +#endif
> > +
> >       if (argc == 0) {
> >               print_events(NULL, raw_dump, !desc_flag, long_desc_flag,
> >                               details_flag, deprecated);
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index 7d7912e121d6..7d2737f33c2e 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -64,6 +64,10 @@
> >  #include <linux/zalloc.h>
> >  #include <linux/bitmap.h>
> >
> > +#ifdef HAVE_LIBPFM
> > +#include <perfmon/pfmlib.h>
> > +#endif
> > +
> >  struct switch_output {
> >       bool             enabled;
> >       bool             signal;
> > @@ -2415,6 +2419,11 @@ static struct option __record_options[] = {
> >  #endif
> >       OPT_CALLBACK(0, "max-size", &record.output_max_size,
> >                    "size", "Limit the maximum size of the output file", parse_output_max_size),
> > +#ifdef HAVE_LIBPFM
> > +     OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
> > +             "libpfm4 event selector. use 'perf list' to list available events",
> > +             parse_libpfm_events_option),
> > +#endif
> >       OPT_END()
> >  };
> >
> > @@ -2455,6 +2464,17 @@ int cmd_record(int argc, const char **argv)
> >       if (rec->evlist == NULL)
> >               return -ENOMEM;
> >
> > +#ifdef HAVE_LIBPFM
> > +     {
> > +             int ret;
> > +             ret = pfm_initialize();
> > +             if (ret != PFM_SUCCESS) {
> > +                     ui__warning("warning libpfm failed to initialize: %s\n",
> > +                             pfm_strerror(ret));
> > +             }
> > +     }
> > +#endif
> > +
> >       err = perf_config(perf_record_config, rec);
> >       if (err)
> >               return err;
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index ec053dc1e35c..c47eaf238f0c 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -89,6 +89,10 @@
> >  #include <linux/ctype.h>
> >  #include <perf/evlist.h>
> >
> > +#ifdef HAVE_LIBPFM
> > +#include <perfmon/pfmlib.h>
> > +#endif
> > +
> >  #define DEFAULT_SEPARATOR    " "
> >  #define FREEZE_ON_SMI_PATH   "devices/cpu/freeze_on_smi"
> >
> > @@ -933,6 +937,11 @@ static struct option stat_options[] = {
> >                   "Use with 'percore' event qualifier to show the event "
> >                   "counts of one hardware thread by sum up total hardware "
> >                   "threads of same physical core"),
> > +#ifdef HAVE_LIBPFM
> > +     OPT_CALLBACK(0, "pfm-events", &evsel_list, "event",
> > +             "libpfm4 event selector. use 'perf list' to list available events",
> > +             parse_libpfm_events_option),
> > +#endif
> >       OPT_END()
> >  };
> >
> > @@ -1871,6 +1880,18 @@ int cmd_stat(int argc, const char **argv)
> >       unsigned int interval, timeout;
> >       const char * const stat_subcommands[] = { "record", "report" };
> >
> > +#ifdef HAVE_LIBPFM
> > +     {
> > +             int ret;
> > +             ret = pfm_initialize();
> > +             if (ret != PFM_SUCCESS) {
> > +                     fprintf(stderr,
> > +                             "warning libpfm failed to initialize: %s\n",
> > +                             pfm_strerror(ret));
> > +             }
> > +     }
> > +#endif
> > +
> >       setlocale(LC_ALL, "");
> >
> >       evsel_list = evlist__new();
> > diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> > index 6684d94b1398..afec285f9877 100644
> > --- a/tools/perf/builtin-top.c
> > +++ b/tools/perf/builtin-top.c
> > @@ -84,6 +84,10 @@
> >  #include <linux/ctype.h>
> >  #include <perf/mmap.h>
> >
> > +#ifdef HAVE_LIBPFM
> > +#include <perfmon/pfmlib.h>
> > +#endif
> > +
> >  static volatile int done;
> >  static volatile int resize;
> >
> > @@ -1565,6 +1569,11 @@ int cmd_top(int argc, const char **argv)
> >                   "Sort the output by the event at the index n in group. "
> >                   "If n is invalid, sort by the first event. "
> >                   "WARNING: should be used on grouped events."),
> > +#ifdef HAVE_LIBPFM
> > +     OPT_CALLBACK(0, "pfm-events", &top.evlist, "event",
> > +             "libpfm4 event selector. use 'perf list' to list available events",
> > +             parse_libpfm_events_option),
> > +#endif
> >       OPTS_EVSWITCH(&top.evswitch),
> >       OPT_END()
> >       };
> > @@ -1578,6 +1587,17 @@ int cmd_top(int argc, const char **argv)
> >       if (status < 0)
> >               return status;
> >
> > +#ifdef HAVE_LIBPFM
> > +     {
> > +             int ret;
> > +             ret = pfm_initialize();
> > +             if (ret != PFM_SUCCESS) {
> > +                     ui__warning("warning libpfm failed to initialize: %s\n",
> > +                             pfm_strerror(ret));
> > +             }
> > +     }
> > +#endif
> > +
> >       top.annotation_opts.min_pcnt = 5;
> >       top.annotation_opts.context  = 4;
> >
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index eb880efbce16..ca1b9cbf3355 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -2448,7 +2448,7 @@ bool perf_evsel__fallback(struct evsel *evsel, int err,
> >
> >               /* Is there already the separator in the name. */
> >               if (strchr(name, '/') ||
> > -                 strchr(name, ':'))
> > +                 (strchr(name, ':') && !evsel->is_libpfm_event))
> >                       sep = "";
> >
> >               if (asprintf(&new_name, "%s%su", name, sep) < 0)
> > diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> > index 53187c501ee8..0b6eec714e6f 100644
> > --- a/tools/perf/util/evsel.h
> > +++ b/tools/perf/util/evsel.h
> > @@ -76,6 +76,7 @@ struct evsel {
> >       bool                    ignore_missing_thread;
> >       bool                    forced_leader;
> >       bool                    use_uncore_alias;
> > +     bool                    is_libpfm_event;
> >       /* parse modifier helper */
> >       int                     exclude_GH;
> >       int                     sample_read;
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 10107747b361..31ed184566c8 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -37,6 +37,11 @@
> >  #include "util/evsel_config.h"
> >  #include "util/event.h"
> >
> > +#ifdef HAVE_LIBPFM
> > +#include <perfmon/pfmlib_perf_event.h>
> > +static void print_libpfm_events(bool name_only);
> > +#endif
> > +
> >  #define MAX_NAME_LEN 100
> >
> >  #ifdef PARSER_DEBUG
> > @@ -2794,6 +2799,10 @@ void print_events(const char *event_glob, bool name_only, bool quiet_flag,
> >       print_sdt_events(NULL, NULL, name_only);
> >
> >       metricgroup__print(true, true, NULL, name_only, details_flag);
> > +
> > +#ifdef HAVE_LIBPFM
> > +     print_libpfm_events(name_only);
> > +#endif
> >  }
> >
> >  int parse_events__is_hardcoded_term(struct parse_events_term *term)
> > @@ -3042,3 +3051,240 @@ char *parse_events_formats_error_string(char *additional_terms)
> >  fail:
> >       return NULL;
> >  }
> > +
> > +#ifdef HAVE_LIBPFM
> > +static int
> > +parse_libpfm_event(char *strp, struct perf_event_attr *attr)
> > +{
> > +     int ret;
> > +
> > +     ret = pfm_get_perf_event_encoding(strp, PFM_PLM0|PFM_PLM3,
> > +                                     attr, NULL, NULL);
> > +     return ret;
> > +}
> > +
> > +int parse_libpfm_events_option(const struct option *opt, const char *str,
> > +                     int unset __maybe_unused)
> > +{
> > +     struct evlist *evlist = *(struct evlist **)opt->value;
> > +     struct perf_event_attr attr;
> > +     struct perf_pmu *pmu;
> > +     struct evsel *evsel, *grp_leader = NULL;
> > +     char *p, *q, *p_orig;
> > +     const char *sep;
> > +     int grp_evt = -1;
> > +     int ret;
> > +
> > +     p_orig = p = strdup(str);
> > +     if (!p)
> > +             return -1;
> > +     /*
> > +      * force loading of the PMU list
> > +      */
> > +     perf_pmu__scan(NULL);
> > +
> > +     for (q = p; strsep(&p, ",{}"); q = p) {
> > +             sep = p ? str + (p - p_orig - 1) : "";
> > +             if (*sep == '{') {
> > +                     if (grp_evt > -1) {
> > +                             fprintf(stderr, "nested event groups not supported\n");
> > +                             goto error;
> > +                     }
> > +                     grp_evt++;
> > +             }
> > +
> > +             /* no event */
> > +             if (*q == '\0')
> > +                     continue;
> > +
> > +             memset(&attr, 0, sizeof(attr));
> > +             event_attr_init(&attr);
> > +
> > +             ret = parse_libpfm_event(q, &attr);
> > +             if (ret != PFM_SUCCESS) {
> > +                     fprintf(stderr, "failed to parse event %s : %s\n", str, pfm_strerror(ret));
> > +                     goto error;
> > +             }
> > +
> > +             evsel = perf_evsel__new_idx(&attr, evlist->core.nr_entries);
> > +             if (evsel == NULL)
> > +                     goto error;
> > +
> > +             evsel->name = strdup(q);
> > +             if (!evsel->name) {
> > +                     evsel__delete(evsel);
> > +                     goto error;
> > +             }
> > +             evsel->is_libpfm_event = true;
> > +
> > +             pmu = perf_pmu__find_by_type((unsigned)attr.type);
> > +             if (pmu)
> > +                     evsel->core.own_cpus = perf_cpu_map__get(pmu->cpus);
> > +
> > +             evlist__add(evlist, evsel);
> > +
> > +             if (grp_evt == 0)
> > +                     grp_leader = evsel;
> > +
> > +             if (grp_evt > -1) {
> > +                     evsel->leader = grp_leader;
> > +                     grp_leader->core.nr_members++;
> > +                     grp_evt++;
> > +             }
> > +
> > +             if (*sep == '}') {
> > +                     if (grp_evt < 0) {
> > +                             fprintf(stderr, "cannot close a non-existing event group\n");
> > +                             goto error;
> > +                     }
> > +                     evlist->nr_groups++;
> > +                     grp_leader = NULL;
> > +                     grp_evt = -1;
> > +             }
> > +     }
> > +     return 0;
> > +error:
> > +     free(p_orig);
> > +     return -1;
> > +}
> > +
> > +static const char *srcs[PFM_ATTR_CTRL_MAX]={
> > +     [PFM_ATTR_CTRL_UNKNOWN] = "???",
> > +     [PFM_ATTR_CTRL_PMU] = "PMU",
> > +     [PFM_ATTR_CTRL_PERF_EVENT] = "perf_event",
> > +};
> > +
> > +static void
> > +print_attr_flags(pfm_event_attr_info_t *info)
> > +{
> > +     int n = 0;
> > +
> > +     if (info->is_dfl) {
> > +             printf("[default] ");
> > +             n++;
> > +     }
> > +
> > +     if (info->is_precise) {
> > +             printf("[precise] ");
> > +             n++;
> > +     }
> > +
> > +     if (!n)
> > +             printf("- ");
> > +}
> > +
> > +static void
> > +print_libpfm_detailed_events(pfm_pmu_info_t *pinfo, pfm_event_info_t *info)
> > +{
> > +     pfm_event_attr_info_t ainfo;
> > +     const char *src;
> > +     int j, ret;
> > +
> > +     ainfo.size = sizeof(ainfo);
> > +
> > +     printf("\nName  : %s\n", info->name);
> > +     printf("PMU   : %s\n", pinfo->name);
> > +     printf("Desc  : %s\n", info->desc);
> > +     printf("Equiv : %s\n", info->equiv ? info->equiv : "None");
> > +     printf("Code  : 0x%"PRIx64"\n", info->code);
> > +
> > +     pfm_for_each_event_attr(j, info) {
> > +             ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
> > +             if (ret != PFM_SUCCESS)
> > +                     continue;
> > +
> > +             if (ainfo.ctrl >= PFM_ATTR_CTRL_MAX)
> > +                     ainfo.ctrl = PFM_ATTR_CTRL_UNKNOWN;
> > +
> > +             src = srcs[ainfo.ctrl];
> > +             switch(ainfo.type) {
> > +             case PFM_ATTR_UMASK:
> > +                     printf("Umask : 0x%02"PRIx64" : %s: [%s] : ", ainfo.code, src, ainfo.name);
> > +                     print_attr_flags(&ainfo);
> > +                     printf(": %s\n", ainfo.desc);
> > +                     break;
> > +             case PFM_ATTR_MOD_BOOL:
> > +                     printf("Modif : %s: [%s] : %s (boolean)\n", src, ainfo.name, ainfo.desc);
> > +                     break;
> > +             case PFM_ATTR_MOD_INTEGER:
> > +                     printf("Modif : %s: [%s] : %s (integer)\n", src, ainfo.name, ainfo.desc);
> > +                     break;
> > +             case PFM_ATTR_NONE:
> > +             case PFM_ATTR_RAW_UMASK:
> > +             case PFM_ATTR_MAX:
> > +             default:
> > +                     printf("Attr  : %s: [%s] : %s\n", src, ainfo.name, ainfo.desc);
> > +             }
> > +     }
> > +}
> > +
> > +/*
> > + * list all pmu::event:umask, pmu::event
> > + * printed events may not be all valid combinations of umask for an event
> > + */
> > +static void
> > +print_libpfm_simplified_events(pfm_pmu_info_t *pinfo, pfm_event_info_t *info)
> > +{
> > +     pfm_event_attr_info_t ainfo;
> > +     int j, ret;
> > +     int um = 0;
> > +
> > +     ainfo.size = sizeof(ainfo);
> > +
> > +     pfm_for_each_event_attr(j, info) {
> > +             ret = pfm_get_event_attr_info(info->idx, j, PFM_OS_PERF_EVENT_EXT, &ainfo);
> > +             if (ret != PFM_SUCCESS)
> > +                     continue;
> > +
> > +             if (ainfo.type != PFM_ATTR_UMASK)
> > +                     continue;
> > +
> > +             printf("%s::%s:%s\n", pinfo->name, info->name, ainfo.name);
> > +             um++;
> > +     }
> > +     if (um == 0)
> > +             printf("%s::%s\n", pinfo->name, info->name);
> > +}
> > +
> > +static void
> > +print_libpfm_events(bool name_only)
> > +{
> > +     pfm_event_info_t info;
> > +     pfm_pmu_info_t pinfo;
> > +     pfm_event_attr_info_t ainfo;
> > +     int i, p, ret;
> > +
> > +     /* initialize to zero to indicate ABI version */
> > +     info.size  = sizeof(info);
> > +     pinfo.size = sizeof(pinfo);
> > +     ainfo.size = sizeof(ainfo);
> > +
> > +     putchar('\n');
> > +
> > +     pfm_for_all_pmus(p) {
> > +             ret = pfm_get_pmu_info(p, &pinfo);
> > +             if (ret != PFM_SUCCESS)
> > +                     continue;
> > +
> > +             /* ony print events that are supported by host HW */
> > +             if (!pinfo.is_present)
> > +                     continue;
> > +
> > +             /* handled by perf directly */
> > +             if (pinfo.pmu == PFM_PMU_PERF_EVENT)
> > +                     continue;
> > +
> > +             for (i = pinfo.first_event; i != -1; i = pfm_get_event_next(i)) {
> > +
> > +                     ret = pfm_get_event_info(i, PFM_OS_PERF_EVENT_EXT, &info);
> > +                     if (ret != PFM_SUCCESS)
> > +                             continue;
> > +
> > +                     if (!name_only)
> > +                             print_libpfm_detailed_events(&pinfo, &info);
> > +                     else
> > +                             print_libpfm_simplified_events(&pinfo, &info);
> > +             }
> > +     }
> > +}
> > +#endif
> > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> > index 27596cbd0ba0..84d4799c9a31 100644
> > --- a/tools/perf/util/parse-events.h
> > +++ b/tools/perf/util/parse-events.h
> > @@ -37,6 +37,11 @@ int parse_events_terms(struct list_head *terms, const char *str);
> >  int parse_filter(const struct option *opt, const char *str, int unset);
> >  int exclude_perf(const struct option *opt, const char *arg, int unset);
> >
> > +#ifdef HAVE_LIBPFM
> > +extern int parse_libpfm_events_option(const struct option *opt, const char *str,
> > +                             int unset);
> > +#endif
> > +
> >  #define EVENTS_HELP_MAX (128*1024)
> >
> >  enum perf_pmu_event_symbol_type {
> > diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> > index ef6a63f3d386..5e918ca740c6 100644
> > --- a/tools/perf/util/pmu.c
> > +++ b/tools/perf/util/pmu.c
> > @@ -869,6 +869,17 @@ static struct perf_pmu *pmu_find(const char *name)
> >       return NULL;
> >  }
> >
> > +struct perf_pmu *perf_pmu__find_by_type(unsigned int type)
> > +{
> > +     struct perf_pmu *pmu;
> > +
> > +     list_for_each_entry(pmu, &pmus, list)
> > +             if (pmu->type == type)
> > +                     return pmu;
> > +
> > +     return NULL;
> > +}
> > +
> >  struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
> >  {
> >       /*
> > diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
> > index 5fb3f16828df..de3b868d912c 100644
> > --- a/tools/perf/util/pmu.h
> > +++ b/tools/perf/util/pmu.h
> > @@ -65,6 +65,7 @@ struct perf_pmu_alias {
> >  };
> >
> >  struct perf_pmu *perf_pmu__find(const char *name);
> > +struct perf_pmu *perf_pmu__find_by_type(unsigned int type);
> >  int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
> >                    struct list_head *head_terms,
> >                    struct parse_events_error *error);
> > --
> > 2.26.0.rc2.310.g2932bb562d-goog
> >
>
> --
>
> - Arnaldo

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