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Subject[PATCH v4 10/17] perf pmu-events: Hide pmu_events_map
From
Move usage of the table to pmu-events.c so it may be hidden. By
abstracting the table the implementation can later be changed.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/pmu-events/empty-pmu-events.c | 81 ++++++++-
tools/perf/pmu-events/jevents.py | 81 ++++++++-
tools/perf/pmu-events/pmu-events.h | 29 +--
tools/perf/tests/pmu-events.c | 218 +++++++++++------------
tools/perf/util/metricgroup.c | 15 +-
tools/perf/util/pmu.c | 34 +---
tools/perf/util/pmu.h | 2 +-
7 files changed, 280 insertions(+), 180 deletions(-)

diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index 216ea0482c37..8ef75aff996c 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/tools/perf/pmu-events/empty-pmu-events.c
@@ -6,6 +6,8 @@
* The test cpu/soc is provided for testing.
*/
#include "pmu-events/pmu-events.h"
+#include "util/header.h"
+#include "util/pmu.h"
#include <string.h>
#include <stddef.h>

@@ -110,7 +112,26 @@ static const struct pmu_event pme_test_soc_cpu[] = {
},
};

-const struct pmu_events_map pmu_events_map[] = {
+
+/*
+ * Map a CPU to its table of PMU events. The CPU is identified by the
+ * cpuid field, which is an arch-specific identifier for the CPU.
+ * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
+ * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
+ *
+ * The cpuid can contain any character other than the comma.
+ */
+struct pmu_events_map {
+ const char *arch;
+ const char *cpuid;
+ const struct pmu_event *table;
+};
+
+/*
+ * Global table mapping each known CPU for the architecture to its
+ * table of PMU events.
+ */
+static const struct pmu_events_map pmu_events_map[] = {
{
.arch = "testarch",
.cpuid = "testcpu",
@@ -162,6 +183,62 @@ static const struct pmu_sys_events pmu_sys_event_tables[] = {
},
};

+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu)
+{
+ const struct pmu_event *table = NULL;
+ char *cpuid = perf_pmu__getcpuid(pmu);
+ int i;
+
+ /* on some platforms which uses cpus map, cpuid can be NULL for
+ * PMUs other than CORE PMUs.
+ */
+ if (!cpuid)
+ return NULL;
+
+ i = 0;
+ for (;;) {
+ const struct pmu_events_map *map = &pmu_events_map[i++];
+
+ if (!map->table)
+ break;
+
+ if (!strcmp_cpuid_str(map->cpuid, cpuid)) {
+ table = map->table;
+ break;
+ }
+ }
+ free(cpuid);
+ return table;
+}
+
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid)
+{
+ for (const struct pmu_events_map *tables = &pmu_events_map[0];
+ tables->table;
+ tables++) {
+ if (!strcmp(tables->arch, arch) && !strcmp_cpuid_str(tables->cpuid, cpuid))
+ return tables->table;
+ }
+ return NULL;
+}
+
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data)
+{
+ for (const struct pmu_events_map *tables = &pmu_events_map[0];
+ tables->table;
+ tables++) {
+ for (const struct pmu_event *pe = &tables->table[0];
+ pe->name || pe->metric_group || pe->metric_name;
+ pe++) {
+ int ret = fn(pe, &tables->table[0], data);
+
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
const struct pmu_event *find_sys_events_table(const char *name)
{
for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
@@ -181,7 +258,7 @@ int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data)
for (const struct pmu_event *pe = &tables->table[0];
pe->name || pe->metric_group || pe->metric_name;
pe++) {
- int ret = fn(pe, data);
+ int ret = fn(pe, &tables->table[0], data);

if (ret)
return ret;
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index dd21bc9eeeed..e976c5e8e80b 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -333,7 +333,27 @@ def process_one_file(parents: Sequence[str], item: os.DirEntry) -> None:

def print_mapping_table(archs: Sequence[str]) -> None:
"""Read the mapfile and generate the struct from cpuid string to event table."""
- _args.output_file.write('const struct pmu_events_map pmu_events_map[] = {\n')
+ _args.output_file.write("""
+/*
+ * Map a CPU to its table of PMU events. The CPU is identified by the
+ * cpuid field, which is an arch-specific identifier for the CPU.
+ * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
+ * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
+ *
+ * The cpuid can contain any character other than the comma.
+ */
+struct pmu_events_map {
+ const char *arch;
+ const char *cpuid;
+ const struct pmu_event *table;
+};
+
+/*
+ * Global table mapping each known CPU for the architecture to its
+ * table of PMU events.
+ */
+const struct pmu_events_map pmu_events_map[] = {
+""")
for arch in archs:
if arch == 'test':
_args.output_file.write("""{
@@ -389,6 +409,61 @@ static const struct pmu_sys_events pmu_sys_event_tables[] = {
\t},
};

+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu)
+{
+ const struct pmu_event *table = NULL;
+ char *cpuid = perf_pmu__getcpuid(pmu);
+ int i;
+
+ /* on some platforms which uses cpus map, cpuid can be NULL for
+ * PMUs other than CORE PMUs.
+ */
+ if (!cpuid)
+ return NULL;
+
+ i = 0;
+ for (;;) {
+ const struct pmu_events_map *map = &pmu_events_map[i++];
+ if (!map->table)
+ break;
+
+ if (!strcmp_cpuid_str(map->cpuid, cpuid)) {
+ table = map->table;
+ break;
+ }
+ }
+ free(cpuid);
+ return table;
+}
+
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid)
+{
+ for (const struct pmu_events_map *tables = &pmu_events_map[0];
+ tables->table;
+ tables++) {
+ if (!strcmp(tables->arch, arch) && !strcmp_cpuid_str(tables->cpuid, cpuid))
+ return tables->table;
+ }
+ return NULL;
+}
+
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data)
+{
+ for (const struct pmu_events_map *tables = &pmu_events_map[0];
+ tables->table;
+ tables++) {
+ for (const struct pmu_event *pe = &tables->table[0];
+ pe->name || pe->metric_group || pe->metric_name;
+ pe++) {
+ int ret = fn(pe, &tables->table[0], data);
+
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
const struct pmu_event *find_sys_events_table(const char *name)
{
for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
@@ -408,7 +483,7 @@ int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data)
for (const struct pmu_event *pe = &tables->table[0];
pe->name || pe->metric_group || pe->metric_name;
pe++) {
- int ret = fn(pe, data);
+ int ret = fn(pe, &tables->table[0], data);

if (ret)
return ret;
@@ -449,6 +524,8 @@ def main() -> None:

_args.output_file.write("""
#include "pmu-events/pmu-events.h"
+#include "util/header.h"
+#include "util/pmu.h"
#include <string.h>
#include <stddef.h>

diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index 2386212b1df0..485e730f9922 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/tools/perf/pmu-events/pmu-events.h
@@ -2,6 +2,8 @@
#ifndef PMU_EVENTS_H
#define PMU_EVENTS_H

+struct perf_pmu;
+
enum aggr_mode_class {
PerChip = 1,
PerCore
@@ -28,30 +30,15 @@ struct pmu_event {
const char *metric_constraint;
};

-/*
- *
- * Map a CPU to its table of PMU events. The CPU is identified by the
- * cpuid field, which is an arch-specific identifier for the CPU.
- * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
- * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
- *
- * The cpuid can contain any character other than the comma.
- */
-struct pmu_events_map {
- const char *arch;
- const char *cpuid;
- const struct pmu_event *table;
-};
+typedef int (*pmu_event_iter_fn)(const struct pmu_event *pe,
+ const struct pmu_event *table,
+ void *data);

-/*
- * Global table mapping each known CPU for the architecture to its
- * table of PMU events.
- */
-extern const struct pmu_events_map pmu_events_map[];
+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu);
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid);
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data);

const struct pmu_event *find_sys_events_table(const char *name);
-
-typedef int (*pmu_event_iter_fn)(const struct pmu_event *pe, void *data);
int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data);

#endif
diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index b3cde5f98982..ea8b41b5c4e3 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -272,18 +272,6 @@ static bool is_same(const char *reference, const char *test)
return !strcmp(reference, test);
}

-static const struct pmu_event *__test_pmu_get_events_table(void)
-{
- for (const struct pmu_events_map *map = &pmu_events_map[0]; map->cpuid; map++) {
- if (!strcmp(map->cpuid, "testcpu"))
- return map->table;
- }
-
- pr_err("could not find test events map\n");
-
- return NULL;
-}
-
static int compare_pmu_events(const struct pmu_event *e1, const struct pmu_event *e2)
{
if (!is_same(e1->name, e2->name)) {
@@ -438,7 +426,7 @@ static int test__pmu_event_table(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
const struct pmu_event *sys_event_tables = find_sys_events_table("pme_test_soc_sys");
- const struct pmu_event *table = __test_pmu_get_events_table();
+ const struct pmu_event *table = find_core_events_table("testarch", "testcpu");
int map_events = 0, expected_events;

/* ignore 3x sentinels */
@@ -534,7 +522,7 @@ static int __test_core_pmu_event_aliases(char *pmu_name, int *count)
struct perf_pmu *pmu;
LIST_HEAD(aliases);
int res = 0;
- const struct pmu_event *table = __test_pmu_get_events_table();
+ const struct pmu_event *table = find_core_events_table("testarch", "testcpu");
struct perf_pmu_alias *a, *tmp;

if (!table)
@@ -591,7 +579,7 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
LIST_HEAD(aliases);
int res = 0;

- events_table = __test_pmu_get_events_table();
+ events_table = find_core_events_table("testarch", "testcpu");
if (!events_table)
return -1;
pmu_add_cpu_aliases_map(&aliases, pmu, events_table);
@@ -845,11 +833,6 @@ static int check_parse_fake(const char *id)
return ret;
}

-static void expr_failure(const char *msg, const struct pmu_event *pe)
-{
- pr_debug("%s\nOn metric %s\nOn expression %s\n", msg, pe->metric_name, pe->metric_expr);
-}
-
struct metric {
struct list_head list;
struct metric_ref metric_ref;
@@ -915,93 +898,100 @@ static int resolve_metric_simple(struct expr_parse_ctx *pctx,

}

-static int test__parsing(struct test_suite *test __maybe_unused,
- int subtest __maybe_unused)
+static void expr_failure(const char *msg, const struct pmu_event *pe)
{
- const struct pmu_event *cpus_table = pmu_events_map__find();
- const struct pmu_event *pe;
- int i, j, k;
- int ret = 0;
+ pr_debug("%s\nOn metric %s\nOn expression %s\n", msg, pe->metric_name, pe->metric_expr);
+}
+
+
+struct test__parsing_data {
+ const struct pmu_event *cpus_table;
struct expr_parse_ctx *ctx;
+ int failures;
+};
+
+static int test__parsing_callback(const struct pmu_event *pe, const struct pmu_event *table,
+ void *vdata)
+{
+ struct test__parsing_data *data = vdata;
+ struct metric *metric, *tmp;
+ struct hashmap_entry *cur;
+ LIST_HEAD(compound_list);
+ size_t bkt;
+ int k;
double result;

- ctx = expr__ctx_new();
- if (!ctx) {
- pr_debug("expr__ctx_new failed");
- return TEST_FAIL;
+ if (!pe->metric_expr)
+ return 0;
+
+ pr_debug("Found metric '%s'\n", pe->metric_name);
+
+ expr__ctx_clear(data->ctx);
+ if (expr__find_ids(pe->metric_expr, NULL, data->ctx) < 0) {
+ expr_failure("Parse find ids failed", pe);
+ data->failures++;
+ return 0;
}
- i = 0;
- for (;;) {
- const struct pmu_events_map *map = &pmu_events_map[i++];

- if (!map->table)
- break;
- j = 0;
- for (;;) {
- struct metric *metric, *tmp;
- struct hashmap_entry *cur;
- LIST_HEAD(compound_list);
- size_t bkt;
-
- pe = &map->table[j++];
- if (!pe->name && !pe->metric_group && !pe->metric_name)
- break;
- if (!pe->metric_expr)
- continue;
- expr__ctx_clear(ctx);
- if (expr__find_ids(pe->metric_expr, NULL, ctx) < 0) {
- expr_failure("Parse find ids failed", pe);
- ret++;
- continue;
- }
+ if (resolve_metric_simple(data->ctx, &compound_list, table,
+ pe->metric_name)) {
+ expr_failure("Could not resolve metrics", pe);
+ data->failures++;
+ return TEST_FAIL; /* Don't tolerate errors due to severity */
+ }

- if (resolve_metric_simple(ctx, &compound_list, map->table,
- pe->metric_name)) {
- expr_failure("Could not resolve metrics", pe);
- ret++;
- goto exit; /* Don't tolerate errors due to severity */
- }
+ /*
+ * Add all ids with a made up value. The value may trigger divide by
+ * zero when subtracted and so try to make them unique.
+ */
+ k = 1;
+ hashmap__for_each_entry(data->ctx->ids, cur, bkt)
+ expr__add_id_val(data->ctx, strdup(cur->key), k++);

- /*
- * Add all ids with a made up value. The value may
- * trigger divide by zero when subtracted and so try to
- * make them unique.
- */
- k = 1;
- hashmap__for_each_entry(ctx->ids, cur, bkt)
- expr__add_id_val(ctx, strdup(cur->key), k++);
-
- hashmap__for_each_entry(ctx->ids, cur, bkt) {
- if (check_parse_cpu(cur->key, map->table == cpus_table,
- pe))
- ret++;
- }
+ hashmap__for_each_entry(data->ctx->ids, cur, bkt) {
+ if (check_parse_cpu(cur->key, table == data->cpus_table, pe))
+ data->failures++;
+ }

- list_for_each_entry_safe(metric, tmp, &compound_list, list) {
- expr__add_ref(ctx, &metric->metric_ref);
- free(metric);
- }
+ list_for_each_entry_safe(metric, tmp, &compound_list, list) {
+ expr__add_ref(data->ctx, &metric->metric_ref);
+ free(metric);
+ }

- if (expr__parse(&result, ctx, pe->metric_expr)) {
- /*
- * Parsing failed, make numbers go from large to
- * small which can resolve divide by zero
- * issues.
- */
- k = 1024;
- hashmap__for_each_entry(ctx->ids, cur, bkt)
- expr__add_id_val(ctx, strdup(cur->key), k--);
- if (expr__parse(&result, ctx, pe->metric_expr)) {
- expr_failure("Parse failed", pe);
- ret++;
- }
- }
+ if (expr__parse(&result, data->ctx, pe->metric_expr)) {
+ /*
+ * Parsing failed, make numbers go from large to small which can
+ * resolve divide by zero issues.
+ */
+ k = 1024;
+ hashmap__for_each_entry(data->ctx->ids, cur, bkt)
+ expr__add_id_val(data->ctx, strdup(cur->key), k--);
+ if (expr__parse(&result, data->ctx, pe->metric_expr)) {
+ expr_failure("Parse failed", pe);
+ data->failures++;
}
}
- expr__ctx_free(ctx);
- /* TODO: fail when not ok */
-exit:
- return ret == 0 ? TEST_OK : TEST_SKIP;
+ return 0;
+}
+
+static int test__parsing(struct test_suite *test __maybe_unused,
+ int subtest __maybe_unused)
+{
+ struct test__parsing_data data = {
+ .cpus_table = pmu_events_map__find(),
+ .ctx = expr__ctx_new(),
+ .failures = 0,
+ };
+
+ if (!data.ctx) {
+ pr_debug("expr__ctx_new failed");
+ return TEST_FAIL;
+ }
+ pmu_for_each_core_event(test__parsing_callback, &data);
+ pmu_for_each_sys_event(test__parsing_callback, &data);
+
+ expr__ctx_free(data.ctx);
+ return data.failures == 0 ? TEST_OK : TEST_FAIL;
}

struct test_metric {
@@ -1073,6 +1063,16 @@ static int metric_parse_fake(const char *str)
return ret;
}

+static int test__parsing_fake_callback(const struct pmu_event *pe,
+ const struct pmu_event *table __maybe_unused,
+ void *data __maybe_unused)
+{
+ if (!pe->metric_expr)
+ return 0;
+
+ return metric_parse_fake(pe->metric_expr);
+}
+
/*
* Parse all the metrics for current architecture,
* or all defined cpus via the 'fake_pmu'
@@ -1081,37 +1081,19 @@ static int metric_parse_fake(const char *str)
static int test__parsing_fake(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
- unsigned int i, j;
int err = 0;

- for (i = 0; i < ARRAY_SIZE(metrics); i++) {
+ for (size_t i = 0; i < ARRAY_SIZE(metrics); i++) {
err = metric_parse_fake(metrics[i].str);
if (err)
return err;
}

- i = 0;
- for (;;) {
- const struct pmu_events_map *map = &pmu_events_map[i++];
+ err = pmu_for_each_core_event(test__parsing_fake_callback, NULL);
+ if (err)
+ return err;

- if (!map->table)
- break;
- j = 0;
- for (;;) {
- const struct pmu_event *pe = &map->table[j++];
-
- if (!pe->name && !pe->metric_group && !pe->metric_name)
- break;
- if (!pe->metric_expr)
- continue;
- pr_debug("Found metric '%s' for '%s'\n", pe->metric_name, map->cpuid);
- err = metric_parse_fake(pe->metric_expr);
- if (err)
- return err;
- }
- }
-
- return 0;
+ return pmu_for_each_sys_event(test__parsing_fake_callback, NULL);
}

static struct test_case pmu_events_tests[] = {
diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 4d32b4fbf67d..680f7c63838d 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -502,14 +502,14 @@ struct metricgroup_print_sys_idata {
bool details;
};

-typedef int (*metricgroup_sys_event_iter_fn)(const struct pmu_event *pe, void *);
-
struct metricgroup_iter_data {
- metricgroup_sys_event_iter_fn fn;
+ pmu_event_iter_fn fn;
void *data;
};

-static int metricgroup__sys_event_iter(const struct pmu_event *pe, void *data)
+static int metricgroup__sys_event_iter(const struct pmu_event *pe,
+ const struct pmu_event *table __maybe_unused,
+ void *data)
{
struct metricgroup_iter_data *d = data;
struct perf_pmu *pmu = NULL;
@@ -522,13 +522,15 @@ static int metricgroup__sys_event_iter(const struct pmu_event *pe, void *data)
if (!pmu->id || strcmp(pmu->id, pe->compat))
continue;

- return d->fn(pe, d->data);
+ return d->fn(pe, table, d->data);
}

return 0;
}

-static int metricgroup__print_sys_event_iter(const struct pmu_event *pe, void *data)
+static int metricgroup__print_sys_event_iter(const struct pmu_event *pe,
+ const struct pmu_event *table __maybe_unused,
+ void *data)
{
struct metricgroup_print_sys_idata *d = data;

@@ -1101,6 +1103,7 @@ static int add_metric(struct list_head *metric_list,
}

static int metricgroup__add_metric_sys_event_iter(const struct pmu_event *pe,
+ const struct pmu_event *table __maybe_unused,
void *data)
{
struct metricgroup_add_iter_data *d = data;
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index f3e3c4a147e9..5bb03d4e52a3 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -690,7 +690,7 @@ static int is_arm_pmu_core(const char *name)
return file_available(path);
}

-static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
+char *perf_pmu__getcpuid(struct perf_pmu *pmu)
{
char *cpuid;
static bool printed;
@@ -710,34 +710,6 @@ static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
return cpuid;
}

-const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu)
-{
- const struct pmu_event *table = NULL;
- char *cpuid = perf_pmu__getcpuid(pmu);
- int i;
-
- /* on some platforms which uses cpus map, cpuid can be NULL for
- * PMUs other than CORE PMUs.
- */
- if (!cpuid)
- return NULL;
-
- i = 0;
- for (;;) {
- const struct pmu_events_map *map = &pmu_events_map[i++];
-
- if (!map->table)
- break;
-
- if (!strcmp_cpuid_str(map->cpuid, cpuid)) {
- table = map->table;
- break;
- }
- }
- free(cpuid);
- return table;
-}
-
__weak const struct pmu_event *pmu_events_map__find(void)
{
return perf_pmu__find_table(NULL);
@@ -874,7 +846,9 @@ struct pmu_sys_event_iter_data {
struct perf_pmu *pmu;
};

-static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe, void *data)
+static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
+ const struct pmu_event *table __maybe_unused,
+ void *data)
{
struct pmu_sys_event_iter_data *idata = data;
struct perf_pmu *pmu = idata->pmu;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 015242c83698..06df99ba2029 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -128,7 +128,7 @@ struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu);
void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
const struct pmu_event *map);

-const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu);
+char *perf_pmu__getcpuid(struct perf_pmu *pmu);
const struct pmu_event *pmu_events_map__find(void);
bool pmu_uncore_alias_match(const char *pmu_name, const char *name);
void perf_pmu_free_alias(struct perf_pmu_alias *alias);
--
2.37.1.559.g78731f0fdb-goog
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