Re: [PATCH v12 4/4] perf tools: add support for libpfm4
From: Ian Rogers
Date: Thu Apr 30 2020 - 10:26:47 EST
On Thu, Apr 30, 2020 at 6:34 AM Arnaldo Carvalho de Melo
<arnaldo.melo@xxxxxxxxx> wrote:
>
> Em Wed, Apr 29, 2020 at 04:14:43PM -0700, Ian Rogers escreveu:
> > From: Stephane Eranian <eranian@xxxxxxxxxx>
> >
> > This patch links perf with the libpfm4 library if it is available
> > and LIBPFM4 is 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.
>
> Hey, I think we should not call libpfm_initialize() in all tools, better
> leave it to when the --pfm-event callback gets called, because the user
> is really using that event syntax, i.e. do it lazily, to reduce the
> amount of initialization that perf does, which is already excessive and
> needs triming down, to do more things only when they are really, really
> needed.
>
> I have applied the previous, preparatory patches.
Thanks! I didn't see the whole set rebasing on:
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=perf/core
and so sent it all again:
https://lore.kernel.org/lkml/20200430142419.252180-5-irogers@xxxxxxxxxx/T/#u
Thanks,
Ian
> - Arnaldo
>
> > 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 ....
> >
> > Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
> > Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
> > ---
> > 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 | 13 ++
> > tools/perf/Makefile.perf | 2 +
> > tools/perf/builtin-list.c | 3 +
> > tools/perf/builtin-record.c | 8 +
> > 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 ++++
> > 20 files changed, 645 insertions(+), 8 deletions(-)
> > create mode 100644 tools/perf/tests/pfm.c
> > create mode 100644 tools/perf/util/pfm.c
> > create mode 100644 tools/perf/util/pfm.h
> >
> > 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 20227dabc208..ee2024691d46 100644
> > --- a/tools/perf/Documentation/perf-top.txt
> > +++ b/tools/perf/Documentation/perf-top.txt
> > @@ -329,6 +329,17 @@ Default is to monitor all CPUS.
> > The known limitations include exception handing such as
> > setjmp/longjmp will have calls/returns not match.
> >
> > +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 12a8204d63c6..b67804fee1e3 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -1012,6 +1012,19 @@ ifdef LIBCLANGLLVM
> > endif
> > endif
> >
> > +ifdef LIBPFM4
> > + $(call feature_check,libpfm4)
> > + ifeq ($(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 94a495594e99..dc82578c8773 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 LIBPFM4 to enable libpfm4 events extension.
> > +#
> >
> > # As per kernel Makefile, avoid funny character set dependencies
> > unexport LC_ALL
> > diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> > index 965ef017496f..d2069bdcb469 100644
> > --- a/tools/perf/builtin-list.c
> > +++ b/tools/perf/builtin-list.c
> > @@ -14,6 +14,7 @@
> > #include "util/pmu.h"
> > #include "util/debug.h"
> > #include "util/metricgroup.h"
> > +#include "util/pfm.h"
> > #include <subcmd/pager.h>
> > #include <subcmd/parse-options.h>
> > #include <stdio.h>
> > @@ -53,6 +54,8 @@ int cmd_list(int argc, const char **argv)
> >
> > setup_pager();
> >
> > + libpfm_initialize();
> > +
> > if (!raw_dump && pager_in_use())
> > printf("\nList of pre-defined events (to be used in -e):\n\n");
> >
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index 1ab349abe904..fc55b641849f 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -43,6 +43,7 @@
> > #include "util/time-utils.h"
> > #include "util/units.h"
> > #include "util/bpf-event.h"
> > +#include "util/pfm.h"
> > #include "asm/bug.h"
> > #include "perf.h"
> >
> > @@ -2421,6 +2422,11 @@ 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()
> > };
> >
> > @@ -2461,6 +2467,8 @@ int cmd_record(int argc, const char **argv)
> > if (rec->evlist == NULL)
> > return -ENOMEM;
> >
> > + libpfm_initialize();
> > +
> > 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 9207b6c45475..607920321c15 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -66,6 +66,7 @@
> > #include "util/time-utils.h"
> > #include "util/top.h"
> > #include "util/affinity.h"
> > +#include "util/pfm.h"
> > #include "asm/bug.h"
> >
> > #include <linux/time64.h>
> > @@ -936,6 +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()
> > };
> >
> > @@ -1874,6 +1880,8 @@ int cmd_stat(int argc, const char **argv)
> > unsigned int interval, timeout;
> > const char * const stat_subcommands[] = { "record", "report" };
> >
> > + libpfm_initialize();
> > +
> > setlocale(LC_ALL, "");
> >
> > evsel_list = evlist__new();
> > diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> > index 6b067a5ba1d5..e1f477a18f93 100644
> > --- a/tools/perf/builtin-top.c
> > +++ b/tools/perf/builtin-top.c
> > @@ -53,6 +53,7 @@
> >
> > #include "util/debug.h"
> > #include "util/ordered-events.h"
> > +#include "util/pfm.h"
> >
> > #include <assert.h>
> > #include <elf.h>
> > @@ -1577,6 +1578,11 @@ int cmd_top(int argc, const char **argv)
> > "WARNING: should be used on grouped events."),
> > OPT_BOOLEAN(0, "stitch-lbr", &top.stitch_lbr,
> > "Enable LBR callgraph stitching approach"),
> > +#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()
> > };
> > @@ -1590,6 +1596,8 @@ int cmd_top(int argc, const char **argv)
> > if (status < 0)
> > return status;
> >
> > + libpfm_initialize();
> > +
> > top.annotation_opts.min_pcnt = 5;
> > top.annotation_opts.context = 4;
> >
> > diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
> > index b3d1bf13ca07..7d2ccec9fd75 100644
> > --- a/tools/perf/tests/Build
> > +++ b/tools/perf/tests/Build
> > @@ -56,6 +56,7 @@ perf-y += mem2node.o
> > perf-y += maps.o
> > perf-y += time-utils-test.o
> > perf-y += genelf.o
> > +perf-y += pfm.o
> >
> > $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
> > $(call rule_mkdir)
> > diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> > index b6322eb0f423..8b323151f22c 100644
> > --- a/tools/perf/tests/builtin-test.c
> > +++ b/tools/perf/tests/builtin-test.c
> > @@ -313,6 +313,15 @@ static struct test generic_tests[] = {
> > .desc = "maps__merge_in",
> > .func = test__maps__merge_in,
> > },
> > + {
> > + .desc = "Test libpfm4 support",
> > + .func = test__pfm,
> > + .subtest = {
> > + .skip_if_fail = true,
> > + .get_nr = test__pfm_subtest_get_nr,
> > + .get_desc = test__pfm_subtest_get_desc,
> > + }
> > + },
> > {
> > .func = NULL,
> > },
> > diff --git a/tools/perf/tests/pfm.c b/tools/perf/tests/pfm.c
> > new file mode 100644
> > index 000000000000..1d594fd3d9c1
> > --- /dev/null
> > +++ b/tools/perf/tests/pfm.c
> > @@ -0,0 +1,207 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Test support for libpfm4 event encodings.
> > + *
> > + * Copyright 2020 Google LLC.
> > + */
> > +#include "tests.h"
> > +#include "util/debug.h"
> > +#include "util/evlist.h"
> > +#include "util/pfm.h"
> > +
> > +#include <linux/kernel.h>
> > +
> > +#ifdef HAVE_LIBPFM
> > +static int test__pfm_events(void);
> > +static int test__pfm_group(void);
> > +#endif
> > +
> > +static const struct {
> > + int (*func)(void);
> > + const char *desc;
> > +} pfm_testcase_table[] = {
> > +#ifdef HAVE_LIBPFM
> > + {
> > + .func = test__pfm_events,
> > + .desc = "test of individual --pfm-events",
> > + },
> > + {
> > + .func = test__pfm_group,
> > + .desc = "test groups of --pfm-events",
> > + },
> > +#endif
> > +};
> > +
> > +#ifdef HAVE_LIBPFM
> > +static int count_pfm_events(struct perf_evlist *evlist)
> > +{
> > + struct perf_evsel *evsel;
> > + int count = 0;
> > +
> > + perf_evlist__for_each_entry(evlist, evsel) {
> > + count++;
> > + }
> > + return count;
> > +}
> > +
> > +static int test__pfm_events(void)
> > +{
> > + struct evlist *evlist;
> > + struct option opt;
> > + size_t i;
> > + const struct {
> > + const char *events;
> > + int nr_events;
> > + } table[] = {
> > + {
> > + .events = "",
> > + .nr_events = 0,
> > + },
> > + {
> > + .events = "instructions",
> > + .nr_events = 1,
> > + },
> > + {
> > + .events = "instructions,cycles",
> > + .nr_events = 2,
> > + },
> > + {
> > + .events = "stereolab",
> > + .nr_events = 0,
> > + },
> > + {
> > + .events = "instructions,instructions",
> > + .nr_events = 2,
> > + },
> > + {
> > + .events = "stereolab,instructions",
> > + .nr_events = 0,
> > + },
> > + {
> > + .events = "instructions,stereolab",
> > + .nr_events = 1,
> > + },
> > + };
> > +
> > + libpfm_initialize();
> > +
> > + for (i = 0; i < ARRAY_SIZE(table); i++) {
> > + evlist = evlist__new();
> > + if (evlist == NULL)
> > + return -ENOMEM;
> > +
> > + opt.value = evlist;
> > + parse_libpfm_events_option(&opt,
> > + table[i].events,
> > + 0);
> > + TEST_ASSERT_EQUAL(table[i].events,
> > + count_pfm_events(&evlist->core),
> > + table[i].nr_events);
> > + TEST_ASSERT_EQUAL(table[i].events,
> > + evlist->nr_groups,
> > + 0);
> > +
> > + evlist__delete(evlist);
> > + }
> > + return 0;
> > +}
> > +
> > +static int test__pfm_group(void)
> > +{
> > + struct evlist *evlist;
> > + struct option opt;
> > + size_t i;
> > + const struct {
> > + const char *events;
> > + int nr_events;
> > + int nr_groups;
> > + } table[] = {
> > + {
> > + .events = "{},",
> > + .nr_events = 0,
> > + .nr_groups = 0,
> > + },
> > + {
> > + .events = "{instructions}",
> > + .nr_events = 1,
> > + .nr_groups = 1,
> > + },
> > + {
> > + .events = "{instructions},{}",
> > + .nr_events = 1,
> > + .nr_groups = 1,
> > + },
> > + {
> > + .events = "{},{instructions}",
> > + .nr_events = 0,
> > + .nr_groups = 0,
> > + },
> > + {
> > + .events = "{instructions},{instructions}",
> > + .nr_events = 2,
> > + .nr_groups = 2,
> > + },
> > + {
> > + .events = "{instructions,cycles},{instructions,cycles}",
> > + .nr_events = 4,
> > + .nr_groups = 2,
> > + },
> > + {
> > + .events = "{stereolab}",
> > + .nr_events = 0,
> > + .nr_groups = 0,
> > + },
> > + {
> > + .events =
> > + "{instructions,cycles},{instructions,stereolab}",
> > + .nr_events = 3,
> > + .nr_groups = 1,
> > + },
> > + };
> > +
> > + libpfm_initialize();
> > +
> > + for (i = 0; i < ARRAY_SIZE(table); i++) {
> > + evlist = evlist__new();
> > + if (evlist == NULL)
> > + return -ENOMEM;
> > +
> > + opt.value = evlist;
> > + parse_libpfm_events_option(&opt,
> > + table[i].events,
> > + 0);
> > + TEST_ASSERT_EQUAL(table[i].events,
> > + count_pfm_events(&evlist->core),
> > + table[i].nr_events);
> > + TEST_ASSERT_EQUAL(table[i].events,
> > + evlist->nr_groups,
> > + table[i].nr_groups);
> > +
> > + evlist__delete(evlist);
> > + }
> > + return 0;
> > +}
> > +#endif
> > +
> > +const char *test__pfm_subtest_get_desc(int i)
> > +{
> > + if (i < 0 || i >= (int)ARRAY_SIZE(pfm_testcase_table))
> > + return NULL;
> > + return pfm_testcase_table[i].desc;
> > +}
> > +
> > +int test__pfm_subtest_get_nr(void)
> > +{
> > + return (int)ARRAY_SIZE(pfm_testcase_table);
> > +}
> > +
> > +int test__pfm(struct test *test __maybe_unused, int i __maybe_unused)
> > +{
> > +#ifdef HAVE_LIBPFM
> > + if (i < 0 || i >= (int)ARRAY_SIZE(pfm_testcase_table))
> > + return TEST_FAIL;
> > + return pfm_testcase_table[i].func();
> > +#else
> > + return TEST_SKIP;
> > +#endif
> > +}
> > diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
> > index 61a1ab032080..47cbae753b42 100644
> > --- a/tools/perf/tests/tests.h
> > +++ b/tools/perf/tests/tests.h
> > @@ -112,6 +112,9 @@ int test__mem2node(struct test *t, int subtest);
> > int test__maps__merge_in(struct test *t, int subtest);
> > int test__time_utils(struct test *t, int subtest);
> > int test__jit_write_elf(struct test *test, int subtest);
> > +int test__pfm(struct test *test, int subtest);
> > +const char *test__pfm_subtest_get_desc(int subtest);
> > +int test__pfm_subtest_get_nr(void);
> >
> > bool test__bp_signal_is_supported(void);
> > bool test__bp_account_is_supported(void);
> > diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> > index c0cf8dff694e..afd3d2221c83 100644
> > --- a/tools/perf/util/Build
> > +++ b/tools/perf/util/Build
> > @@ -177,6 +177,8 @@ perf-$(CONFIG_LIBBPF) += bpf-event.o
> >
> > perf-$(CONFIG_CXX) += c++/
> >
> > +perf-$(CONFIG_LIBPFM4) += pfm.o
> > +
> > CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
> > CFLAGS_llvm-utils.o += -DPERF_INCLUDE_DIR="BUILD_STR($(perf_include_dir_SQ))"
> >
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index 6a571d322bb2..a5c88d52c11c 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -2433,7 +2433,7 @@ 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 a463bc65b001..709a9d494767 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..e7e0faf36e3c 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -36,6 +36,7 @@
> > #include "metricgroup.h"
> > #include "util/evsel_config.h"
> > #include "util/event.h"
> > +#include "util/pfm.h"
> >
> > #define MAX_NAME_LEN 100
> >
> > @@ -344,6 +345,7 @@ static char *get_config_name(struct list_head *head_terms)
> > static struct evsel *
> > __add_event(struct list_head *list, int *idx,
> > struct perf_event_attr *attr,
> > + bool init_attr,
> > char *name, struct perf_pmu *pmu,
> > struct list_head *config_terms, bool auto_merge_stats,
> > const char *cpu_list)
> > @@ -352,7 +354,8 @@ __add_event(struct list_head *list, int *idx,
> > struct perf_cpu_map *cpus = pmu ? pmu->cpus :
> > cpu_list ? perf_cpu_map__new(cpu_list) : NULL;
> >
> > - event_attr_init(attr);
> > + if (init_attr)
> > + event_attr_init(attr);
> >
> > evsel = perf_evsel__new_idx(attr, *idx);
> > if (!evsel)
> > @@ -370,15 +373,25 @@ __add_event(struct list_head *list, int *idx,
> > if (config_terms)
> > list_splice(config_terms, &evsel->config_terms);
> >
> > - list_add_tail(&evsel->core.node, list);
> > + if (list)
> > + list_add_tail(&evsel->core.node, list);
> > +
> > return evsel;
> > }
> >
> > +struct evsel *parse_events__add_event(int idx, struct perf_event_attr *attr,
> > + char *name, struct perf_pmu *pmu)
> > +{
> > + return __add_event(NULL, &idx, attr, false, name, pmu, NULL, false,
> > + NULL);
> > +}
> > +
> > static int add_event(struct list_head *list, int *idx,
> > struct perf_event_attr *attr, char *name,
> > struct list_head *config_terms)
> > {
> > - return __add_event(list, idx, attr, name, NULL, config_terms, false, NULL) ? 0 : -ENOMEM;
> > + return __add_event(list, idx, attr, true, name, NULL, config_terms,
> > + false, NULL) ? 0 : -ENOMEM;
> > }
> >
> > static int add_event_tool(struct list_head *list, int *idx,
> > @@ -390,7 +403,8 @@ static int add_event_tool(struct list_head *list, int *idx,
> > .config = PERF_COUNT_SW_DUMMY,
> > };
> >
> > - evsel = __add_event(list, idx, &attr, NULL, NULL, NULL, false, "0");
> > + evsel = __add_event(list, idx, &attr, true, NULL, NULL, NULL, false,
> > + "0");
> > if (!evsel)
> > return -ENOMEM;
> > evsel->tool_event = tool_event;
> > @@ -1446,8 +1460,8 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> >
> > if (!head_config) {
> > attr.type = pmu->type;
> > - evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu, NULL,
> > - auto_merge_stats, NULL);
> > + evsel = __add_event(list, &parse_state->idx, &attr, true, NULL,
> > + pmu, NULL, auto_merge_stats, NULL);
> > if (evsel) {
> > evsel->pmu_name = name ? strdup(name) : NULL;
> > evsel->use_uncore_alias = use_uncore_alias;
> > @@ -1487,7 +1501,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> > return -EINVAL;
> > }
> >
> > - evsel = __add_event(list, &parse_state->idx, &attr,
> > + evsel = __add_event(list, &parse_state->idx, &attr, true,
> > get_config_name(head_config), pmu,
> > &config_terms, auto_merge_stats, NULL);
> > if (evsel) {
> > @@ -2794,6 +2808,8 @@ 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);
> > +
> > + print_libpfm_events(name_only, long_desc);
> > }
> >
> > int parse_events__is_hardcoded_term(struct parse_events_term *term)
> > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> > index 27596cbd0ba0..f7f555b1ca35 100644
> > --- a/tools/perf/util/parse-events.h
> > +++ b/tools/perf/util/parse-events.h
> > @@ -17,6 +17,7 @@ struct evlist;
> > struct parse_events_error;
> >
> > struct option;
> > +struct perf_pmu;
> >
> > struct tracepoint_path {
> > char *system;
> > @@ -186,6 +187,9 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> > bool auto_merge_stats,
> > bool use_alias);
> >
> > +struct evsel *parse_events__add_event(int idx, struct perf_event_attr *attr,
> > + char *name, struct perf_pmu *pmu);
> > +
> > int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
> > char *str,
> > struct list_head **listp);
> > diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c
> > new file mode 100644
> > index 000000000000..4b11adf832a0
> > --- /dev/null
> > +++ b/tools/perf/util/pfm.c
> > @@ -0,0 +1,277 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Support for libpfm4 event encoding.
> > + *
> > + * Copyright 2020 Google LLC.
> > + */
> > +#include "util/cpumap.h"
> > +#include "util/debug.h"
> > +#include "util/event.h"
> > +#include "util/evlist.h"
> > +#include "util/evsel.h"
> > +#include "util/parse-events.h"
> > +#include "util/pmu.h"
> > +#include "util/pfm.h"
> > +
> > +#include <string.h>
> > +#include <linux/kernel.h>
> > +#include <perfmon/pfmlib_perf_event.h>
> > +
> > +void libpfm_initialize(void)
> > +{
> > + int ret;
> > +
> > + ret = pfm_initialize();
> > + if (ret != PFM_SUCCESS) {
> > + ui__warning("libpfm failed to initialize: %s\n",
> > + pfm_strerror(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) {
> > + ui__error(
> > + "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 = pfm_get_perf_event_encoding(q, PFM_PLM0|PFM_PLM3,
> > + &attr, NULL, NULL);
> > +
> > + if (ret != PFM_SUCCESS) {
> > + ui__error("failed to parse event %s : %s\n", str,
> > + pfm_strerror(ret));
> > + goto error;
> > + }
> > +
> > + pmu = perf_pmu__find_by_type((unsigned int)attr.type);
> > + evsel = parse_events__add_event(evlist->core.nr_entries,
> > + &attr, q, pmu);
> > + if (evsel == NULL)
> > + goto error;
> > +
> > + evsel->is_libpfm_event = true;
> > +
> > + 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) {
> > + ui__error(
> > + "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_events_detailed(pfm_event_info_t *info, bool long_desc)
> > +{
> > + pfm_event_attr_info_t ainfo;
> > + const char *src;
> > + int j, ret;
> > +
> > + ainfo.size = sizeof(ainfo);
> > +
> > + printf(" %s\n", info->name);
> > + printf(" [%s]\n", info->desc);
> > + if (long_desc) {
> > + if (info->equiv)
> > + printf(" Equiv: %s\n", info->equiv);
> > +
> > + 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.type == PFM_ATTR_UMASK) {
> > + printf(" %s:%s\n", info->name, ainfo.name);
> > + printf(" [%s]\n", ainfo.desc);
> > + }
> > +
> > + if (!long_desc)
> > + 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: ",
> > + ainfo.code, src);
> > + print_attr_flags(&ainfo);
> > + putchar('\n');
> > + 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_events_raw(pfm_pmu_info_t *pinfo, pfm_event_info_t *info)
> > +{
> > + pfm_event_attr_info_t ainfo;
> > + int j, ret;
> > + bool has_umask = false;
> > +
> > + 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);
> > + has_umask = true;
> > + }
> > + if (!has_umask)
> > + printf("%s::%s\n", pinfo->name, info->name);
> > +}
> > +
> > +void print_libpfm_events(bool name_only, bool long_desc)
> > +{
> > + pfm_event_info_t info;
> > + pfm_pmu_info_t pinfo;
> > + int i, p, ret;
> > +
> > + /* initialize to zero to indicate ABI version */
> > + info.size = sizeof(info);
> > + pinfo.size = sizeof(pinfo);
> > +
> > + if (!name_only)
> > + puts("\nList of pre-defined events (to be used in --pfm-events):\n");
> > +
> > + pfm_for_all_pmus(p) {
> > + bool printed_pmu = false;
> > +
> > + ret = pfm_get_pmu_info(p, &pinfo);
> > + if (ret != PFM_SUCCESS)
> > + continue;
> > +
> > + /* only 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 && !printed_pmu) {
> > + printf("%s:\n", pinfo.name);
> > + printed_pmu = true;
> > + }
> > +
> > + if (!name_only)
> > + print_libpfm_events_detailed(&info, long_desc);
> > + else
> > + print_libpfm_events_raw(&pinfo, &info);
> > + }
> > + if (!name_only && printed_pmu)
> > + putchar('\n');
> > + }
> > +}
> > diff --git a/tools/perf/util/pfm.h b/tools/perf/util/pfm.h
> > new file mode 100644
> > index 000000000000..532dafe88bc0
> > --- /dev/null
> > +++ b/tools/perf/util/pfm.h
> > @@ -0,0 +1,43 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Support for libpfm4 event encoding.
> > + *
> > + * Copyright 2020 Google LLC.
> > + */
> > +#ifndef __PERF_PFM_H
> > +#define __PERF_PFM_H
> > +
> > +#include <subcmd/parse-options.h>
> > +
> > +#ifdef HAVE_LIBPFM
> > +void libpfm_initialize(void);
> > +
> > +int parse_libpfm_events_option(const struct option *opt, const char *str,
> > + int unset);
> > +
> > +void print_libpfm_events(bool name_only, bool long_desc);
> > +
> > +#else
> > +#include <linux/compiler.h>
> > +
> > +static inline void libpfm_initialize(void)
> > +{
> > +}
> > +
> > +static inline int parse_libpfm_events_option(
> > + const struct option *opt __maybe_unused,
> > + const char *str __maybe_unused,
> > + int unset __maybe_unused)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline void print_libpfm_events(bool name_only __maybe_unused,
> > + bool long_desc __maybe_unused)
> > +{
> > +}
> > +
> > +#endif
> > +
> > +
> > +#endif /* __PERF_PFM_H */
> > --
> > 2.26.2.303.gf8c07b1a785-goog
> >
>
> --
>
> - Arnaldo