[PATCH v2 02/18] perf pmu: Abstract alias/event struct

From: Ian Rogers
Date: Thu Aug 24 2023 - 00:15:16 EST

In order to be able to lazily compute aliases/events for a PMU, move
the struct perf_pmu_alias into pmu.c. Add perf_pmu__find_event and
perf_pmu__for_each_event that take a callback that is called for the
found event or for each event. The layout of struct pmu and the
event/alias list is unchanged but the API is altered so that aliases
are no longer directly accessed, allowing for later changes.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
tools/perf/bench/pmu-scan.c | 8 +-
tools/perf/tests/pmu-events.c | 101 +++++++--------
tools/perf/util/parse-events.c | 67 ++++------
tools/perf/util/pmu.c | 212 +++++++++++++++++++++++++++---
tools/perf/util/pmu.h | 71 +++-------
tools/perf/util/pmus.c | 230 +++++++++++----------------------
6 files changed, 366 insertions(+), 323 deletions(-)

diff --git a/tools/perf/bench/pmu-scan.c b/tools/perf/bench/pmu-scan.c
index c7d207f8e13c..9e4d36486f62 100644
--- a/tools/perf/bench/pmu-scan.c
+++ b/tools/perf/bench/pmu-scan.c
@@ -57,9 +57,7 @@ static int save_result(void)
r->is_core = pmu->is_core;
r->nr_caps = pmu->nr_caps;

- r->nr_aliases = 0;
- list_for_each(list, &pmu->aliases)
- r->nr_aliases++;
+ r->nr_aliases = perf_pmu__num_events(pmu);

r->nr_formats = 0;
list_for_each(list, &pmu->format)
@@ -98,9 +96,7 @@ static int check_result(bool core_only)
return -1;
}

- nr = 0;
- list_for_each(list, &pmu->aliases)
- nr++;
+ nr = perf_pmu__num_events(pmu);
if (nr != r->nr_aliases) {
pr_err("Unmatched number of event aliases in %s: expect %d vs got %d\n",
pmu->name, r->nr_aliases, nr);
diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index 05d6e6e21c6f..dc87e66fb118 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -341,7 +341,7 @@ static int compare_pmu_events(const struct pmu_event *e1, const struct pmu_event
return 0;
}

-static int compare_alias_to_test_event(struct perf_pmu_alias *alias,
+static int compare_alias_to_test_event(struct pmu_event_info *alias,
struct perf_pmu_test_event const *test_event,
char const *pmu_name)
{
@@ -496,6 +496,23 @@ static int test__pmu_event_table(struct test_suite *test __maybe_unused,
return 0;
}

+struct test_core_pmu_event_aliases_cb_args {
+ struct perf_pmu_test_event const *test_event;
+ int *count;
+};
+
+static int test_core_pmu_event_aliases_cb(void *state, struct pmu_event_info *alias)
+{
+ struct test_core_pmu_event_aliases_cb_args *args = state;
+
+ if (compare_alias_to_test_event(alias, args->test_event, alias->pmu->name))
+ return -1;
+ (*args->count)++;
+ pr_debug2("testing aliases core PMU %s: matched event %s\n",
+ alias->pmu_name, alias->name);
+ return 0;
+}
+
/* Verify aliases are as expected */
static int __test_core_pmu_event_aliases(char *pmu_name, int *count)
{
@@ -522,25 +539,19 @@ static int __test_core_pmu_event_aliases(char *pmu_name, int *count)
pmu_add_cpu_aliases_table(pmu, table);

for (; *test_event_table; test_event_table++) {
- struct perf_pmu_test_event const *test_event = *test_event_table;
- struct pmu_event const *event = &test_event->event;
- struct perf_pmu_alias *alias = perf_pmu__find_alias(pmu, event->name);
-
- if (!alias) {
- pr_debug("testing aliases core PMU %s: no alias, alias_table->name=%s\n",
- pmu_name, event->name);
- res = -1;
- break;
- }
-
- if (compare_alias_to_test_event(alias, test_event, pmu_name)) {
- res = -1;
- break;
- }
-
- (*count)++;
- pr_debug2("testing aliases core PMU %s: matched event %s\n",
- pmu_name, alias->name);
+ struct perf_pmu_test_event test_event = **test_event_table;
+ struct pmu_event const *event = &test_event.event;
+ struct test_core_pmu_event_aliases_cb_args args = {
+ .test_event = &test_event,
+ .count = count,
+ };
+ int err;
+
+ test_event.event.pmu = pmu_name;
+ err = perf_pmu__find_event(pmu, event->name, &args,
+ test_core_pmu_event_aliases_cb);
+ if (err)
+ res = err;
}
perf_pmu__delete(pmu);

@@ -553,7 +564,6 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
struct perf_pmu_test_event const **table;
struct perf_pmu *pmu = &test_pmu->pmu;
const char *pmu_name = pmu->name;
- struct perf_pmu_alias *a, *tmp, *alias;
const struct pmu_events_table *events_table;
int res = 0;

@@ -564,8 +574,7 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
pmu_add_sys_aliases(pmu);

/* Count how many aliases we generated */
- list_for_each_entry(alias, &pmu->aliases, list)
- alias_count++;
+ alias_count = perf_pmu__num_events(pmu);

/* Count how many aliases we expect from the known table */
for (table = &test_pmu->aliases[0]; *table; table++)
@@ -574,33 +583,25 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
if (alias_count != to_match_count) {
pr_debug("testing aliases uncore PMU %s: mismatch expected aliases (%d) vs found (%d)\n",
pmu_name, to_match_count, alias_count);
- res = -1;
- goto out;
+ return -1;
}

- list_for_each_entry(alias, &pmu->aliases, list) {
- bool matched = false;
-
- for (table = &test_pmu->aliases[0]; *table; table++) {
- struct perf_pmu_test_event const *test_event = *table;
- struct pmu_event const *event = &test_event->event;
-
- if (!strcmp(event->name, alias->name)) {
- if (compare_alias_to_test_event(alias,
- test_event,
- pmu_name)) {
- continue;
- }
- matched = true;
- matched_count++;
- }
- }
-
- if (matched == false) {
+ for (table = &test_pmu->aliases[0]; *table; table++) {
+ struct perf_pmu_test_event test_event = **table;
+ struct pmu_event const *event = &test_event.event;
+ int err;
+ struct test_core_pmu_event_aliases_cb_args args = {
+ .test_event = &test_event,
+ .count = &matched_count,
+ };
+
+ err = perf_pmu__find_event(pmu, event->name, &args,
+ test_core_pmu_event_aliases_cb);
+ if (err) {
+ res = err;
pr_debug("testing aliases uncore PMU %s: could not match alias %s\n",
- pmu_name, alias->name);
- res = -1;
- goto out;
+ pmu_name, event->name);
+ return -1;
}
}

@@ -609,12 +610,6 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu)
pmu_name, matched_count, alias_count);
res = -1;
}
-
-out:
- list_for_each_entry_safe(a, tmp, &pmu->aliases, list) {
- list_del(&a->list);
- perf_pmu_free_alias(a);
- }
return res;
}

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 7d9d687d9191..7cad82a9f578 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -193,38 +193,31 @@ static void fix_raw(struct list_head *config_terms, struct perf_pmu *pmu)
struct parse_events_term *term;

list_for_each_entry(term, config_terms, list) {
- struct perf_pmu_alias *alias;
- bool matched = false;
+ u64 num;

if (term->type_term != PARSE_EVENTS__TERM_TYPE_RAW)
continue;

- list_for_each_entry(alias, &pmu->aliases, list) {
- if (!strcmp(alias->name, term->val.str)) {
- free(term->config);
- term->config = term->val.str;
- term->type_val = PARSE_EVENTS__TERM_TYPE_NUM;
- term->type_term = PARSE_EVENTS__TERM_TYPE_USER;
- term->val.num = 1;
- term->no_value = true;
- matched = true;
- break;
- }
- }
- if (!matched) {
- u64 num;
-
+ if (perf_pmu__have_event(pmu, term->val.str)) {
free(term->config);
- term->config = strdup("config");
- errno = 0;
- num = strtoull(term->val.str + 1, NULL, 16);
- assert(errno == 0);
- free(term->val.str);
+ term->config = term->val.str;
term->type_val = PARSE_EVENTS__TERM_TYPE_NUM;
- term->type_term = PARSE_EVENTS__TERM_TYPE_CONFIG;
- term->val.num = num;
- term->no_value = false;
+ term->type_term = PARSE_EVENTS__TERM_TYPE_USER;
+ term->val.num = 1;
+ term->no_value = true;
+ continue;
}
+
+ free(term->config);
+ term->config = strdup("config");
+ errno = 0;
+ num = strtoull(term->val.str + 1, NULL, 16);
+ assert(errno == 0);
+ free(term->val.str);
+ term->type_val = PARSE_EVENTS__TERM_TYPE_NUM;
+ term->type_term = PARSE_EVENTS__TERM_TYPE_CONFIG;
+ term->val.num = num;
+ term->no_value = false;
}
}

@@ -1458,28 +1451,22 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
INIT_LIST_HEAD(list);

while ((pmu = perf_pmus__scan(pmu)) != NULL) {
- struct perf_pmu_alias *alias;
bool auto_merge_stats;

if (parse_events__filter_pmu(parse_state, pmu))
continue;

- auto_merge_stats = perf_pmu__auto_merge_stats(pmu);
+ if (!perf_pmu__have_event(pmu, str))
+ continue;

- list_for_each_entry(alias, &pmu->aliases, list) {
- if (!strcasecmp(alias->name, str)) {
- parse_events_copy_term_list(head, &orig_head);
- if (!parse_events_add_pmu(parse_state, list,
- pmu->name, orig_head,
- auto_merge_stats, loc)) {
- pr_debug("%s -> %s/%s/\n", str,
- pmu->name, alias->str);
- parse_state->wild_card_pmus = true;
- ok++;
- }
- parse_events_terms__delete(orig_head);
- }
+ auto_merge_stats = perf_pmu__auto_merge_stats(pmu);
+ parse_events_copy_term_list(head, &orig_head);
+ if (!parse_events_add_pmu(parse_state, list, pmu->name,
+ orig_head, auto_merge_stats, loc)) {
+ pr_debug("%s -> %s/%s/\n", str, pmu->name, str);
+ ok++;
}
+ parse_events_terms__delete(orig_head);
}

if (parse_state->fake_pmu) {
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 3cfd3e58da23..268aaebfa70c 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -31,6 +31,61 @@

struct perf_pmu perf_pmu__fake;

+#define UNIT_MAX_LEN 31 /* max length for event unit name */
+
+/**
+ * struct perf_pmu_alias - An event either read from sysfs or builtin in
+ * pmu-events.c, created by parsing the pmu-events json files.
+ */
+struct perf_pmu_alias {
+ /** @name: Name of the event like "mem-loads". */
+ char *name;
+ /** @desc: Optional short description of the event. */
+ char *desc;
+ /** @long_desc: Optional long description. */
+ char *long_desc;
+ /**
+ * @topic: Optional topic such as cache or pipeline, particularly for
+ * json events.
+ */
+ char *topic;
+ /**
+ * @str: Comma separated parameter list like
+ * "event=0xcd,umask=0x1,ldlat=0x3".
+ */
+ char *str;
+ /** @terms: Owned list of the original parsed parameters. */
+ struct list_head terms;
+ /** @list: List element of struct perf_pmu aliases. */
+ struct list_head list;
+ /** @unit: Units for the event, such as bytes or cache lines. */
+ char unit[UNIT_MAX_LEN+1];
+ /** @scale: Value to scale read counter values by. */
+ double scale;
+ /**
+ * @per_pkg: Does the file
+ * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.per-pkg or
+ * equivalent json value exist and have the value 1.
+ */
+ bool per_pkg;
+ /**
+ * @snapshot: Does the file
+ * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.snapshot
+ * exist and have the value 1.
+ */
+ bool snapshot;
+ /**
+ * @deprecated: Is the event hidden and so not shown in perf list by
+ * default.
+ */
+ bool deprecated;
+ /**
+ * @pmu_name: The name copied from the json struct pmu_event. This can
+ * differ from the PMU name as it won't have suffixes.
+ */
+ char *pmu_name;
+};
+
/**
* struct perf_pmu_format - Values from a format file read from
* <sysfs>/devices/cpu/format/ held in struct perf_pmu.
@@ -355,7 +410,7 @@ static void perf_pmu_update_alias(struct perf_pmu_alias *old,
}

/* Delete an alias entry. */
-void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
+static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
{
zfree(&newalias->name);
zfree(&newalias->desc);
@@ -1349,10 +1404,20 @@ int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
return perf_pmu__config_terms(pmu, attr, head_terms, zero, err);
}

+static struct perf_pmu_alias *perf_pmu__find_alias(const struct perf_pmu *pmu, const char *str)
+{
+ struct perf_pmu_alias *alias;
+
+ list_for_each_entry(alias, &pmu->aliases, list) {
+ if (!strcasecmp(alias->name, str))
+ return alias;
+ }
+ return NULL;
+}
+
static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
struct parse_events_term *term)
{
- struct perf_pmu_alias *alias;
char *name;

if (parse_events__is_hardcoded_term(term))
@@ -1364,6 +1429,7 @@ static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
if (pmu_find_format(&pmu->format, term->config))
return NULL;
name = term->config;
+
} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
if (strcasecmp(term->config, "event"))
return NULL;
@@ -1372,11 +1438,7 @@ static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
return NULL;
}

- list_for_each_entry(alias, &pmu->aliases, list) {
- if (!strcasecmp(alias->name, name))
- return alias;
- }
- return NULL;
+ return perf_pmu__find_alias(pmu, name);
}


@@ -1459,16 +1521,33 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
return 0;
}

-struct perf_pmu_alias *perf_pmu__find_alias(struct perf_pmu *pmu, const char *event)
+struct find_event_args {
+ const char *event;
+ void *state;
+ pmu_event_callback cb;
+};
+
+static int find_event_callback(void *state, struct pmu_event_info *info)
{
- struct perf_pmu_alias *alias;
+ struct find_event_args *args = state;

- list_for_each_entry(alias, &pmu->aliases, list)
- if (!strcmp(event, alias->name))
- return alias;
+ if (!strcmp(args->event, info->name))
+ return args->cb(args->state, info);

- return NULL;
+ return 0;
}
+
+int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb)
+{
+ struct find_event_args args = {
+ .event = event,
+ .state = state,
+ .cb = cb,
+ };
+
+ return perf_pmu__for_each_event(pmu, &args, find_event_callback);
+}
+
static void perf_pmu__del_formats(struct list_head *formats)
{
struct perf_pmu_format *fmt, *tmp;
@@ -1508,13 +1587,110 @@ bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)

bool perf_pmu__have_event(const struct perf_pmu *pmu, const char *name)
{
- struct perf_pmu_alias *alias;
+ return perf_pmu__find_alias(pmu, name) != NULL;
+}

- list_for_each_entry(alias, &pmu->aliases, list) {
- if (!strcmp(alias->name, name))
- return true;
+size_t perf_pmu__num_events(const struct perf_pmu *pmu)
+{
+ struct list_head *list;
+ size_t nr = 0;
+
+ list_for_each(list, &pmu->aliases)
+ nr++;
+
+ return pmu->selectable ? nr + 1 : nr;
+}
+
+static int sub_non_neg(int a, int b)
+{
+ if (b > a)
+ return 0;
+ return a - b;
+}
+
+static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,
+ const struct perf_pmu_alias *alias)
+{
+ struct parse_events_term *term;
+ int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
+
+ list_for_each_entry(term, &alias->terms, list) {
+ if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
+ used += snprintf(buf + used, sub_non_neg(len, used),
+ ",%s=%s", term->config,
+ term->val.str);
}
- return false;
+
+ if (sub_non_neg(len, used) > 0) {
+ buf[used] = '/';
+ used++;
+ }
+ if (sub_non_neg(len, used) > 0) {
+ buf[used] = '\0';
+ used++;
+ } else
+ buf[len - 1] = '\0';
+
+ return buf;
+}
+
+int perf_pmu__for_each_event(const struct perf_pmu *pmu, void *state, pmu_event_callback cb)
+{
+ char buf[1024];
+ struct perf_pmu_alias *event;
+ struct pmu_event_info info = {
+ .pmu = pmu,
+ };
+ int ret = 0;
+
+ list_for_each_entry(event, &pmu->aliases, list) {
+ size_t buf_used;
+
+ info.pmu_name = event->pmu_name ?: pmu->name;
+ info.alias = NULL;
+ if (event->desc) {
+ info.name = event->name;
+ buf_used = 0;
+ } else {
+ info.name = format_alias(buf, sizeof(buf), pmu, event);
+ if (pmu->is_core) {
+ info.alias = info.name;
+ info.name = event->name;
+ }
+ buf_used = strlen(buf) + 1;
+ }
+ info.scale_unit = NULL;
+ if (strlen(event->unit) || event->scale != 1.0) {
+ info.scale_unit = buf + buf_used;
+ buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
+ "%G%s", event->scale, event->unit) + 1;
+ }
+ info.desc = event->desc;
+ info.long_desc = event->long_desc;
+ info.encoding_desc = buf + buf_used;
+ buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
+ "%s/%s/", info.pmu_name, event->str) + 1;
+ info.topic = event->topic;
+ info.str = event->str;
+ info.deprecated = event->deprecated;
+ ret = cb(state, &info);
+ if (ret)
+ return ret;
+ }
+ if (pmu->selectable) {
+ info.name = buf;
+ snprintf(buf, sizeof(buf), "%s//", pmu->name);
+ info.alias = NULL;
+ info.scale_unit = NULL;
+ info.desc = NULL;
+ info.long_desc = NULL;
+ info.encoding_desc = NULL;
+ info.topic = NULL;
+ info.pmu_name = pmu->name;
+ info.deprecated = false;
+ ret = cb(state, &info);
+ }
+ return ret;
}

bool perf_pmu__is_software(const struct perf_pmu *pmu)
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 675c9b97f7bf..f37e3d75094f 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -158,61 +158,22 @@ struct perf_pmu_info {
bool snapshot;
};

-#define UNIT_MAX_LEN 31 /* max length for event unit name */
-
-/**
- * struct perf_pmu_alias - An event either read from sysfs or builtin in
- * pmu-events.c, created by parsing the pmu-events json files.
- */
-struct perf_pmu_alias {
- /** @name: Name of the event like "mem-loads". */
- char *name;
- /** @desc: Optional short description of the event. */
- char *desc;
- /** @long_desc: Optional long description. */
- char *long_desc;
- /**
- * @topic: Optional topic such as cache or pipeline, particularly for
- * json events.
- */
- char *topic;
- /**
- * @str: Comma separated parameter list like
- * "event=0xcd,umask=0x1,ldlat=0x3".
- */
- char *str;
- /** @terms: Owned list of the original parsed parameters. */
- struct list_head terms;
- /** @list: List element of struct perf_pmu aliases. */
- struct list_head list;
- /** @unit: Units for the event, such as bytes or cache lines. */
- char unit[UNIT_MAX_LEN+1];
- /** @scale: Value to scale read counter values by. */
- double scale;
- /**
- * @per_pkg: Does the file
- * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.per-pkg or
- * equivalent json value exist and have the value 1.
- */
- bool per_pkg;
- /**
- * @snapshot: Does the file
- * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.snapshot
- * exist and have the value 1.
- */
- bool snapshot;
- /**
- * @deprecated: Is the event hidden and so not shown in perf list by
- * default.
- */
+struct pmu_event_info {
+ const struct perf_pmu *pmu;
+ const char *name;
+ const char* alias;
+ const char *scale_unit;
+ const char *desc;
+ const char *long_desc;
+ const char *encoding_desc;
+ const char *topic;
+ const char *pmu_name;
+ const char *str;
bool deprecated;
- /**
- * @pmu_name: The name copied from the json struct pmu_event. This can
- * differ from the PMU name as it won't have suffixes.
- */
- char *pmu_name;
};

+typedef int (*pmu_event_callback)(void *state, struct pmu_event_info *info);
+
void pmu_add_sys_aliases(struct perf_pmu *pmu);
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
struct list_head *head_terms,
@@ -225,7 +186,7 @@ __u64 perf_pmu__format_bits(struct perf_pmu *pmu, const char *name);
int perf_pmu__format_type(struct perf_pmu *pmu, const char *name);
int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
struct perf_pmu_info *info);
-struct perf_pmu_alias *perf_pmu__find_alias(struct perf_pmu *pmu, const char *event);
+int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb);

int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load);
void perf_pmu_format__set_value(void *format, int config, unsigned long *bits);
@@ -235,6 +196,9 @@ bool is_pmu_core(const char *name);
bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu);
bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu);
bool perf_pmu__have_event(const struct perf_pmu *pmu, const char *name);
+size_t perf_pmu__num_events(const struct perf_pmu *pmu);
+int perf_pmu__for_each_event(const struct perf_pmu *pmu, void *state, pmu_event_callback cb);
+
/**
* perf_pmu_is_software - is the PMU a software PMU as in it uses the
* perf_sw_context in the kernel?
@@ -259,7 +223,6 @@ void pmu_add_cpu_aliases_table(struct perf_pmu *pmu,
char *perf_pmu__getcpuid(struct perf_pmu *pmu);
const struct pmu_events_table *pmu_events_table__find(void);
const struct pmu_metrics_table *pmu_metrics_table__find(void);
-void perf_pmu_free_alias(struct perf_pmu_alias *alias);

int perf_pmu__convert_scale(const char *scale, char **end, double *sval);

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index c58ba9fb6a36..4dd5912617ff 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -258,219 +258,145 @@ int __weak perf_pmus__num_mem_pmus(void)
struct sevent {
/** PMU for event. */
const struct perf_pmu *pmu;
- /**
- * Optional event for name, desc, etc. If not present then this is a
- * selectable PMU and the event name is shown as "//".
- */
- const struct perf_pmu_alias *event;
- /** Is the PMU for the CPU? */
- bool is_cpu;
+ const char *name;
+ const char* alias;
+ const char *scale_unit;
+ const char *desc;
+ const char *long_desc;
+ const char *encoding_desc;
+ const char *topic;
+ const char *pmu_name;
+ bool deprecated;
};

static int cmp_sevent(const void *a, const void *b)
{
const struct sevent *as = a;
const struct sevent *bs = b;
- const char *a_pmu_name = NULL, *b_pmu_name = NULL;
- const char *a_name = "//", *a_desc = NULL, *a_topic = "";
- const char *b_name = "//", *b_desc = NULL, *b_topic = "";
+ bool a_iscpu, b_iscpu;
int ret;

- if (as->event) {
- a_name = as->event->name;
- a_desc = as->event->desc;
- a_topic = as->event->topic ?: "";
- a_pmu_name = as->event->pmu_name;
- }
- if (bs->event) {
- b_name = bs->event->name;
- b_desc = bs->event->desc;
- b_topic = bs->event->topic ?: "";
- b_pmu_name = bs->event->pmu_name;
- }
/* Put extra events last. */
- if (!!a_desc != !!b_desc)
- return !!a_desc - !!b_desc;
+ if (!!as->desc != !!bs->desc)
+ return !!as->desc - !!bs->desc;

/* Order by topics. */
- ret = strcmp(a_topic, b_topic);
+ ret = strcmp(as->topic ?: "", bs->topic ?: "");
if (ret)
return ret;

/* Order CPU core events to be first */
- if (as->is_cpu != bs->is_cpu)
- return as->is_cpu ? -1 : 1;
+ a_iscpu = as->pmu ? as->pmu->is_core : true;
+ b_iscpu = bs->pmu ? bs->pmu->is_core : true;
+ if (a_iscpu != b_iscpu)
+ return a_iscpu ? -1 : 1;

/* Order by PMU name. */
if (as->pmu != bs->pmu) {
- a_pmu_name = a_pmu_name ?: (as->pmu->name ?: "");
- b_pmu_name = b_pmu_name ?: (bs->pmu->name ?: "");
- ret = strcmp(a_pmu_name, b_pmu_name);
+ ret = strcmp(as->pmu_name ?: "", bs->pmu_name ?: "");
if (ret)
return ret;
}

/* Order by event name. */
- return strcmp(a_name, b_name);
+ return strcmp(as->name, bs->name);
}

-static bool pmu_alias_is_duplicate(struct sevent *alias_a,
- struct sevent *alias_b)
+static bool pmu_alias_is_duplicate(struct sevent *a, struct sevent *b)
{
- const char *a_pmu_name = NULL, *b_pmu_name = NULL;
- const char *a_name = "//", *b_name = "//";
-
-
- if (alias_a->event) {
- a_name = alias_a->event->name;
- a_pmu_name = alias_a->event->pmu_name;
- }
- if (alias_b->event) {
- b_name = alias_b->event->name;
- b_pmu_name = alias_b->event->pmu_name;
- }
-
/* Different names -> never duplicates */
- if (strcmp(a_name, b_name))
+ if (strcmp(a->name ?: "//", b->name ?: "//"))
return false;

/* Don't remove duplicates for different PMUs */
- a_pmu_name = a_pmu_name ?: (alias_a->pmu->name ?: "");
- b_pmu_name = b_pmu_name ?: (alias_b->pmu->name ?: "");
- return strcmp(a_pmu_name, b_pmu_name) == 0;
+ return strcmp(a->pmu_name, b->pmu_name) == 0;
}

-static int sub_non_neg(int a, int b)
-{
- if (b > a)
- return 0;
- return a - b;
-}
+struct events_callback_state {
+ struct sevent *aliases;
+ size_t aliases_len;
+ size_t index;
+};

-static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,
- const struct perf_pmu_alias *alias)
+static int perf_pmus__print_pmu_events__callback(void *vstate,
+ struct pmu_event_info *info)
{
- struct parse_events_term *term;
- int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
-
- list_for_each_entry(term, &alias->terms, list) {
- if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
- used += snprintf(buf + used, sub_non_neg(len, used),
- ",%s=%s", term->config,
- term->val.str);
- }
+ struct events_callback_state *state = vstate;
+ struct sevent *s;

- if (sub_non_neg(len, used) > 0) {
- buf[used] = '/';
- used++;
+ if (state->index >= state->aliases_len) {
+ pr_err("Unexpected event %s/%s/\n", info->pmu->name, info->name);
+ return 1;
}
- if (sub_non_neg(len, used) > 0) {
- buf[used] = '\0';
- used++;
- } else
- buf[len - 1] = '\0';
-
- return buf;
+ s = &state->aliases[state->index];
+ s->pmu = info->pmu;
+#define COPY_STR(str) s->str = info->str ? strdup(info->str) : NULL
+ COPY_STR(name);
+ COPY_STR(alias);
+ COPY_STR(scale_unit);
+ COPY_STR(desc);
+ COPY_STR(long_desc);
+ COPY_STR(encoding_desc);
+ COPY_STR(topic);
+ COPY_STR(pmu_name);
+#undef COPY_STR
+ s->deprecated = info->deprecated;
+ state->index++;
+ return 0;
}

void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state)
{
struct perf_pmu *pmu;
- struct perf_pmu_alias *event;
- char buf[1024];
int printed = 0;
- int len, j;
+ int len;
struct sevent *aliases;
+ struct events_callback_state state;

pmu = NULL;
len = 0;
- while ((pmu = perf_pmus__scan(pmu)) != NULL) {
- list_for_each_entry(event, &pmu->aliases, list)
- len++;
- if (pmu->selectable)
- len++;
- }
+ while ((pmu = perf_pmus__scan(pmu)) != NULL)
+ len += perf_pmu__num_events(pmu);
+
aliases = zalloc(sizeof(struct sevent) * len);
if (!aliases) {
pr_err("FATAL: not enough memory to print PMU events\n");
return;
}
pmu = NULL;
- j = 0;
+ state = (struct events_callback_state) {
+ .aliases = aliases,
+ .aliases_len = len,
+ .index = 0,
+ };
while ((pmu = perf_pmus__scan(pmu)) != NULL) {
- bool is_cpu = pmu->is_core;
-
- list_for_each_entry(event, &pmu->aliases, list) {
- aliases[j].event = event;
- aliases[j].pmu = pmu;
- aliases[j].is_cpu = is_cpu;
- j++;
- }
- if (pmu->selectable) {
- aliases[j].event = NULL;
- aliases[j].pmu = pmu;
- aliases[j].is_cpu = is_cpu;
- j++;
- }
+ perf_pmu__for_each_event(pmu, &state, perf_pmus__print_pmu_events__callback);
}
- len = j;
qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
- for (j = 0; j < len; j++) {
- const char *name, *alias = NULL, *scale_unit = NULL,
- *desc = NULL, *long_desc = NULL,
- *encoding_desc = NULL, *topic = NULL,
- *pmu_name = NULL;
- bool deprecated = false;
- size_t buf_used;
-
+ for (int j = 0; j < len; j++) {
/* Skip duplicates */
if (j > 0 && pmu_alias_is_duplicate(&aliases[j], &aliases[j - 1]))
continue;

- if (!aliases[j].event) {
- /* A selectable event. */
- pmu_name = aliases[j].pmu->name;
- buf_used = snprintf(buf, sizeof(buf), "%s//", pmu_name) + 1;
- name = buf;
- } else {
- if (aliases[j].event->desc) {
- name = aliases[j].event->name;
- buf_used = 0;
- } else {
- name = format_alias(buf, sizeof(buf), aliases[j].pmu,
- aliases[j].event);
- if (aliases[j].is_cpu) {
- alias = name;
- name = aliases[j].event->name;
- }
- buf_used = strlen(buf) + 1;
- }
- pmu_name = aliases[j].event->pmu_name ?: (aliases[j].pmu->name ?: "");
- if (strlen(aliases[j].event->unit) || aliases[j].event->scale != 1.0) {
- scale_unit = buf + buf_used;
- buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
- "%G%s", aliases[j].event->scale,
- aliases[j].event->unit) + 1;
- }
- desc = aliases[j].event->desc;
- long_desc = aliases[j].event->long_desc;
- topic = aliases[j].event->topic;
- encoding_desc = buf + buf_used;
- buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
- "%s/%s/", pmu_name, aliases[j].event->str) + 1;
- deprecated = aliases[j].event->deprecated;
- }
print_cb->print_event(print_state,
- pmu_name,
- topic,
- name,
- alias,
- scale_unit,
- deprecated,
+ aliases[j].pmu_name,
+ aliases[j].topic,
+ aliases[j].name,
+ aliases[j].alias,
+ aliases[j].scale_unit,
+ aliases[j].deprecated,
"Kernel PMU event",
- desc,
- long_desc,
- encoding_desc);
+ aliases[j].desc,
+ aliases[j].long_desc,
+ aliases[j].encoding_desc);
+ zfree(&aliases[j].name);
+ zfree(&aliases[j].alias);
+ zfree(&aliases[j].scale_unit);
+ zfree(&aliases[j].desc);
+ zfree(&aliases[j].long_desc);
+ zfree(&aliases[j].encoding_desc);
+ zfree(&aliases[j].topic);
+ zfree(&aliases[j].pmu_name);
}
if (printed && pager_in_use())
printf("\n");
--
2.42.0.rc1.204.g551eb34607-goog