Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2068 insertions, 0 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
new file mode 100644
index 000000000..d515ba8a0
--- /dev/null
+++ b/tools/perf/util/pmu.c
@@ -0,0 +1,2068 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/list.h>
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+#include <linux/ctype.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <dirent.h>
+#include <api/fs/fs.h>
+#include <locale.h>
+#include <fnmatch.h>
+#include <math.h>
+#include "debug.h"
+#include "evsel.h"
+#include "pmu.h"
+#include "pmus.h"
+#include <util/pmu-bison.h>
+#include <util/pmu-flex.h>
+#include "parse-events.h"
+#include "print-events.h"
+#include "header.h"
+#include "string2.h"
+#include "strbuf.h"
+#include "fncache.h"
+#include "util/evsel_config.h"
+
+struct perf_pmu perf_pmu__fake = {
+	.name = "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;
+	/** @terms: Owned list of the original parsed parameters. */
+	struct list_head terms;
+	/** @list: List element of struct perf_pmu aliases. */
+	struct list_head list;
+	/**
+	 * @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;
+	/** @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;
+	/** @from_sysfs: Was the alias from sysfs or a json event? */
+	bool from_sysfs;
+	/** @info_loaded: Have the scale, unit and other values been read from disk? */
+	bool info_loaded;
+};
+
+/**
+ * struct perf_pmu_format - Values from a format file read from
+ * <sysfs>/devices/cpu/format/ held in struct perf_pmu.
+ *
+ * For example, the contents of <sysfs>/devices/cpu/format/event may be
+ * "config:0-7" and will be represented here as name="event",
+ * value=PERF_PMU_FORMAT_VALUE_CONFIG and bits 0 to 7 will be set.
+ */
+struct perf_pmu_format {
+	/** @list: Element on list within struct perf_pmu. */
+	struct list_head list;
+	/** @bits: Which config bits are set by this format value. */
+	DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
+	/** @name: The modifier/file name. */
+	char *name;
+	/**
+	 * @value : Which config value the format relates to. Supported values
+	 * are from PERF_PMU_FORMAT_VALUE_CONFIG to
+	 * PERF_PMU_FORMAT_VALUE_CONFIG_END.
+	 */
+	u16 value;
+	/** @loaded: Has the contents been loaded/parsed. */
+	bool loaded;
+};
+
+static int pmu_aliases_parse(struct perf_pmu *pmu);
+
+static struct perf_pmu_format *perf_pmu__new_format(struct list_head *list, char *name)
+{
+	struct perf_pmu_format *format;
+
+	format = zalloc(sizeof(*format));
+	if (!format)
+		return NULL;
+
+	format->name = strdup(name);
+	if (!format->name) {
+		free(format);
+		return NULL;
+	}
+	list_add_tail(&format->list, list);
+	return format;
+}
+
+/* Called at the end of parsing a format. */
+void perf_pmu_format__set_value(void *vformat, int config, unsigned long *bits)
+{
+	struct perf_pmu_format *format = vformat;
+
+	format->value = config;
+	memcpy(format->bits, bits, sizeof(format->bits));
+}
+
+static void __perf_pmu_format__load(struct perf_pmu_format *format, FILE *file)
+{
+	void *scanner;
+	int ret;
+
+	ret = perf_pmu_lex_init(&scanner);
+	if (ret)
+		return;
+
+	perf_pmu_set_in(file, scanner);
+	ret = perf_pmu_parse(format, scanner);
+	perf_pmu_lex_destroy(scanner);
+	format->loaded = true;
+}
+
+static void perf_pmu_format__load(struct perf_pmu *pmu, struct perf_pmu_format *format)
+{
+	char path[PATH_MAX];
+	FILE *file = NULL;
+
+	if (format->loaded)
+		return;
+
+	if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, "format"))
+		return;
+
+	assert(strlen(path) + strlen(format->name) + 2 < sizeof(path));
+	strcat(path, "/");
+	strcat(path, format->name);
+
+	file = fopen(path, "r");
+	if (!file)
+		return;
+	__perf_pmu_format__load(format, file);
+	fclose(file);
+}
+
+/*
+ * Parse & process all the sysfs attributes located under
+ * the directory specified in 'dir' parameter.
+ */
+int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
+{
+	struct dirent *evt_ent;
+	DIR *format_dir;
+	int ret = 0;
+
+	format_dir = fdopendir(dirfd);
+	if (!format_dir)
+		return -EINVAL;
+
+	while ((evt_ent = readdir(format_dir)) != NULL) {
+		struct perf_pmu_format *format;
+		char *name = evt_ent->d_name;
+
+		if (!strcmp(name, ".") || !strcmp(name, ".."))
+			continue;
+
+		format = perf_pmu__new_format(&pmu->format, name);
+		if (!format) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		if (eager_load) {
+			FILE *file;
+			int fd = openat(dirfd, name, O_RDONLY);
+
+			if (fd < 0) {
+				ret = -errno;
+				break;
+			}
+			file = fdopen(fd, "r");
+			if (!file) {
+				close(fd);
+				break;
+			}
+			__perf_pmu_format__load(format, file);
+			fclose(file);
+		}
+	}
+
+	closedir(format_dir);
+	return ret;
+}
+
+/*
+ * Reading/parsing the default pmu format definition, which should be
+ * located at:
+ * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
+ */
+static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name)
+{
+	int fd;
+
+	fd = perf_pmu__pathname_fd(dirfd, name, "format", O_DIRECTORY);
+	if (fd < 0)
+		return 0;
+
+	/* it'll close the fd */
+	if (perf_pmu__format_parse(pmu, fd, /*eager_load=*/false))
+		return -1;
+
+	return 0;
+}
+
+int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
+{
+	char *lc;
+	int ret = 0;
+
+	/*
+	 * save current locale
+	 */
+	lc = setlocale(LC_NUMERIC, NULL);
+
+	/*
+	 * The lc string may be allocated in static storage,
+	 * so get a dynamic copy to make it survive setlocale
+	 * call below.
+	 */
+	lc = strdup(lc);
+	if (!lc) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * force to C locale to ensure kernel
+	 * scale string is converted correctly.
+	 * kernel uses default C locale.
+	 */
+	setlocale(LC_NUMERIC, "C");
+
+	*sval = strtod(scale, end);
+
+out:
+	/* restore locale */
+	setlocale(LC_NUMERIC, lc);
+	free(lc);
+	return ret;
+}
+
+static int perf_pmu__parse_scale(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
+{
+	struct stat st;
+	ssize_t sret;
+	size_t len;
+	char scale[128];
+	int fd, ret = -1;
+	char path[PATH_MAX];
+
+	len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
+	if (!len)
+		return 0;
+	scnprintf(path + len, sizeof(path) - len, "%s/events/%s.scale", pmu->name, alias->name);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	if (fstat(fd, &st) < 0)
+		goto error;
+
+	sret = read(fd, scale, sizeof(scale)-1);
+	if (sret < 0)
+		goto error;
+
+	if (scale[sret - 1] == '\n')
+		scale[sret - 1] = '\0';
+	else
+		scale[sret] = '\0';
+
+	ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
+error:
+	close(fd);
+	return ret;
+}
+
+static int perf_pmu__parse_unit(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
+{
+	char path[PATH_MAX];
+	size_t len;
+	ssize_t sret;
+	int fd;
+
+
+	len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
+	if (!len)
+		return 0;
+	scnprintf(path + len, sizeof(path) - len, "%s/events/%s.unit", pmu->name, alias->name);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	sret = read(fd, alias->unit, UNIT_MAX_LEN);
+	if (sret < 0)
+		goto error;
+
+	close(fd);
+
+	if (alias->unit[sret - 1] == '\n')
+		alias->unit[sret - 1] = '\0';
+	else
+		alias->unit[sret] = '\0';
+
+	return 0;
+error:
+	close(fd);
+	alias->unit[0] = '\0';
+	return -1;
+}
+
+static int
+perf_pmu__parse_per_pkg(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
+{
+	char path[PATH_MAX];
+	size_t len;
+	int fd;
+
+	len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
+	if (!len)
+		return 0;
+	scnprintf(path + len, sizeof(path) - len, "%s/events/%s.per-pkg", pmu->name, alias->name);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	close(fd);
+
+	alias->per_pkg = true;
+	return 0;
+}
+
+static int perf_pmu__parse_snapshot(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
+{
+	char path[PATH_MAX];
+	size_t len;
+	int fd;
+
+	len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
+	if (!len)
+		return 0;
+	scnprintf(path + len, sizeof(path) - len, "%s/events/%s.snapshot", pmu->name, alias->name);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	alias->snapshot = true;
+	close(fd);
+	return 0;
+}
+
+/* Delete an alias entry. */
+static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
+{
+	zfree(&newalias->name);
+	zfree(&newalias->desc);
+	zfree(&newalias->long_desc);
+	zfree(&newalias->topic);
+	zfree(&newalias->pmu_name);
+	parse_events_terms__purge(&newalias->terms);
+	free(newalias);
+}
+
+static void perf_pmu__del_aliases(struct perf_pmu *pmu)
+{
+	struct perf_pmu_alias *alias, *tmp;
+
+	list_for_each_entry_safe(alias, tmp, &pmu->aliases, list) {
+		list_del(&alias->list);
+		perf_pmu_free_alias(alias);
+	}
+}
+
+static struct perf_pmu_alias *perf_pmu__find_alias(struct perf_pmu *pmu,
+						   const char *name,
+						   bool load)
+{
+	struct perf_pmu_alias *alias;
+
+	if (load && !pmu->sysfs_aliases_loaded)
+		pmu_aliases_parse(pmu);
+
+	list_for_each_entry(alias, &pmu->aliases, list) {
+		if (!strcasecmp(alias->name, name))
+			return alias;
+	}
+	return NULL;
+}
+
+static bool assign_str(const char *name, const char *field, char **old_str,
+				const char *new_str)
+{
+	if (!*old_str && new_str) {
+		*old_str = strdup(new_str);
+		return true;
+	}
+
+	if (!new_str || !strcasecmp(*old_str, new_str))
+		return false; /* Nothing to update. */
+
+	pr_debug("alias %s differs in field '%s' ('%s' != '%s')\n",
+		name, field, *old_str, new_str);
+	zfree(old_str);
+	*old_str = strdup(new_str);
+	return true;
+}
+
+static void read_alias_info(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
+{
+	if (!alias->from_sysfs || alias->info_loaded)
+		return;
+
+	/*
+	 * load unit name and scale if available
+	 */
+	perf_pmu__parse_unit(pmu, alias);
+	perf_pmu__parse_scale(pmu, alias);
+	perf_pmu__parse_per_pkg(pmu, alias);
+	perf_pmu__parse_snapshot(pmu, alias);
+}
+
+struct update_alias_data {
+	struct perf_pmu *pmu;
+	struct perf_pmu_alias *alias;
+};
+
+static int update_alias(const struct pmu_event *pe,
+			const struct pmu_events_table *table __maybe_unused,
+			void *vdata)
+{
+	struct update_alias_data *data = vdata;
+	int ret = 0;
+
+	read_alias_info(data->pmu, data->alias);
+	assign_str(pe->name, "desc", &data->alias->desc, pe->desc);
+	assign_str(pe->name, "long_desc", &data->alias->long_desc, pe->long_desc);
+	assign_str(pe->name, "topic", &data->alias->topic, pe->topic);
+	data->alias->per_pkg = pe->perpkg;
+	if (pe->event) {
+		parse_events_terms__purge(&data->alias->terms);
+		ret = parse_events_terms(&data->alias->terms, pe->event, /*input=*/NULL);
+	}
+	if (!ret && pe->unit) {
+		char *unit;
+
+		ret = perf_pmu__convert_scale(pe->unit, &unit, &data->alias->scale);
+		if (!ret)
+			snprintf(data->alias->unit, sizeof(data->alias->unit), "%s", unit);
+	}
+	return ret;
+}
+
+static int perf_pmu__new_alias(struct perf_pmu *pmu, const char *name,
+				const char *desc, const char *val, FILE *val_fd,
+				const struct pmu_event *pe)
+{
+	struct perf_pmu_alias *alias;
+	int ret;
+	const char *long_desc = NULL, *topic = NULL, *unit = NULL, *pmu_name = NULL;
+	bool deprecated = false, perpkg = false;
+
+	if (perf_pmu__find_alias(pmu, name, /*load=*/ false)) {
+		/* Alias was already created/loaded. */
+		return 0;
+	}
+
+	if (pe) {
+		long_desc = pe->long_desc;
+		topic = pe->topic;
+		unit = pe->unit;
+		perpkg = pe->perpkg;
+		deprecated = pe->deprecated;
+		pmu_name = pe->pmu;
+	}
+
+	alias = zalloc(sizeof(*alias));
+	if (!alias)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&alias->terms);
+	alias->scale = 1.0;
+	alias->unit[0] = '\0';
+	alias->per_pkg = perpkg;
+	alias->snapshot = false;
+	alias->deprecated = deprecated;
+
+	ret = parse_events_terms(&alias->terms, val, val_fd);
+	if (ret) {
+		pr_err("Cannot parse alias %s: %d\n", val, ret);
+		free(alias);
+		return ret;
+	}
+
+	alias->name = strdup(name);
+	alias->desc = desc ? strdup(desc) : NULL;
+	alias->long_desc = long_desc ? strdup(long_desc) :
+				desc ? strdup(desc) : NULL;
+	alias->topic = topic ? strdup(topic) : NULL;
+	alias->pmu_name = pmu_name ? strdup(pmu_name) : NULL;
+	if (unit) {
+		if (perf_pmu__convert_scale(unit, (char **)&unit, &alias->scale) < 0) {
+			perf_pmu_free_alias(alias);
+			return -1;
+		}
+		snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
+	}
+	if (!pe) {
+		/* Update an event from sysfs with json data. */
+		struct update_alias_data data = {
+			.pmu = pmu,
+			.alias = alias,
+		};
+
+		alias->from_sysfs = true;
+		if (pmu->events_table) {
+			if (pmu_events_table__find_event(pmu->events_table, pmu, name,
+							 update_alias, &data) == 0)
+				pmu->loaded_json_aliases++;
+		}
+	}
+
+	if (!pe)
+		pmu->sysfs_aliases++;
+	else
+		pmu->loaded_json_aliases++;
+	list_add_tail(&alias->list, &pmu->aliases);
+	return 0;
+}
+
+static inline bool pmu_alias_info_file(char *name)
+{
+	size_t len;
+
+	len = strlen(name);
+	if (len > 5 && !strcmp(name + len - 5, ".unit"))
+		return true;
+	if (len > 6 && !strcmp(name + len - 6, ".scale"))
+		return true;
+	if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
+		return true;
+	if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
+		return true;
+
+	return false;
+}
+
+/*
+ * Reading the pmu event aliases definition, which should be located at:
+ * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
+ */
+static int pmu_aliases_parse(struct perf_pmu *pmu)
+{
+	char path[PATH_MAX];
+	struct dirent *evt_ent;
+	DIR *event_dir;
+	size_t len;
+	int fd, dir_fd;
+
+	len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
+	if (!len)
+		return 0;
+	scnprintf(path + len, sizeof(path) - len, "%s/events", pmu->name);
+
+	dir_fd = open(path, O_DIRECTORY);
+	if (dir_fd == -1) {
+		pmu->sysfs_aliases_loaded = true;
+		return 0;
+	}
+
+	event_dir = fdopendir(dir_fd);
+	if (!event_dir){
+		close (dir_fd);
+		return -EINVAL;
+	}
+
+	while ((evt_ent = readdir(event_dir))) {
+		char *name = evt_ent->d_name;
+		FILE *file;
+
+		if (!strcmp(name, ".") || !strcmp(name, ".."))
+			continue;
+
+		/*
+		 * skip info files parsed in perf_pmu__new_alias()
+		 */
+		if (pmu_alias_info_file(name))
+			continue;
+
+		fd = openat(dir_fd, name, O_RDONLY);
+		if (fd == -1) {
+			pr_debug("Cannot open %s\n", name);
+			continue;
+		}
+		file = fdopen(fd, "r");
+		if (!file) {
+			close(fd);
+			continue;
+		}
+
+		if (perf_pmu__new_alias(pmu, name, /*desc=*/ NULL,
+					/*val=*/ NULL, file, /*pe=*/ NULL) < 0)
+			pr_debug("Cannot set up %s\n", name);
+		fclose(file);
+	}
+
+	closedir(event_dir);
+	close (dir_fd);
+	pmu->sysfs_aliases_loaded = true;
+	return 0;
+}
+
+static int pmu_alias_terms(struct perf_pmu_alias *alias,
+			   struct list_head *terms)
+{
+	struct parse_events_term *term, *cloned;
+	LIST_HEAD(list);
+	int ret;
+
+	list_for_each_entry(term, &alias->terms, list) {
+		ret = parse_events_term__clone(&cloned, term);
+		if (ret) {
+			parse_events_terms__purge(&list);
+			return ret;
+		}
+		/*
+		 * Weak terms don't override command line options,
+		 * which we don't want for implicit terms in aliases.
+		 */
+		cloned->weak = true;
+		list_add_tail(&cloned->list, &list);
+	}
+	list_splice(&list, terms);
+	return 0;
+}
+
+/*
+ * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
+ * may have a "cpus" file.
+ */
+static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name, bool is_core)
+{
+	struct perf_cpu_map *cpus;
+	const char *templates[] = {
+		"cpumask",
+		"cpus",
+		NULL
+	};
+	const char **template;
+	char pmu_name[PATH_MAX];
+	struct perf_pmu pmu = {.name = pmu_name};
+	FILE *file;
+
+	strlcpy(pmu_name, name, sizeof(pmu_name));
+	for (template = templates; *template; template++) {
+		file = perf_pmu__open_file_at(&pmu, dirfd, *template);
+		if (!file)
+			continue;
+		cpus = perf_cpu_map__read(file);
+		fclose(file);
+		if (cpus)
+			return cpus;
+	}
+
+	/* Nothing found, for core PMUs assume this means all CPUs. */
+	return is_core ? perf_cpu_map__get(cpu_map__online()) : NULL;
+}
+
+static bool pmu_is_uncore(int dirfd, const char *name)
+{
+	int fd;
+
+	fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH);
+	if (fd < 0)
+		return false;
+
+	close(fd);
+	return true;
+}
+
+static char *pmu_id(const char *name)
+{
+	char path[PATH_MAX], *str;
+	size_t len;
+
+	perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier");
+
+	if (filename__read_str(path, &str, &len) < 0)
+		return NULL;
+
+	str[len - 1] = 0; /* remove line feed */
+
+	return str;
+}
+
+/**
+ * is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in
+ *         sysfs on some platforms like ARM or Intel hybrid. Looking for
+ *         possible the cpus file in sysfs files to identify whether this is a
+ *         core device.
+ * @name: The PMU name such as "cpu_atom".
+ */
+static int is_sysfs_pmu_core(const char *name)
+{
+	char path[PATH_MAX];
+
+	if (!perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpus"))
+		return 0;
+	return file_available(path);
+}
+
+char *perf_pmu__getcpuid(struct perf_pmu *pmu)
+{
+	char *cpuid;
+	static bool printed;
+
+	cpuid = getenv("PERF_CPUID");
+	if (cpuid)
+		cpuid = strdup(cpuid);
+	if (!cpuid)
+		cpuid = get_cpuid_str(pmu);
+	if (!cpuid)
+		return NULL;
+
+	if (!printed) {
+		pr_debug("Using CPUID %s\n", cpuid);
+		printed = true;
+	}
+	return cpuid;
+}
+
+__weak const struct pmu_events_table *pmu_events_table__find(void)
+{
+	return perf_pmu__find_events_table(NULL);
+}
+
+__weak const struct pmu_metrics_table *pmu_metrics_table__find(void)
+{
+	return perf_pmu__find_metrics_table(NULL);
+}
+
+/**
+ * perf_pmu__match_ignoring_suffix - Does the pmu_name match tok ignoring any
+ *                                   trailing suffix? The Suffix must be in form
+ *                                   tok_{digits}, or tok{digits}.
+ * @pmu_name: The pmu_name with possible suffix.
+ * @tok: The possible match to pmu_name without suffix.
+ */
+static bool perf_pmu__match_ignoring_suffix(const char *pmu_name, const char *tok)
+{
+	const char *p;
+
+	if (strncmp(pmu_name, tok, strlen(tok)))
+		return false;
+
+	p = pmu_name + strlen(tok);
+	if (*p == 0)
+		return true;
+
+	if (*p == '_')
+		++p;
+
+	/* Ensure we end in a number */
+	while (1) {
+		if (!isdigit(*p))
+			return false;
+		if (*(++p) == 0)
+			break;
+	}
+
+	return true;
+}
+
+/**
+ * pmu_uncore_alias_match - does name match the PMU name?
+ * @pmu_name: the json struct pmu_event name. This may lack a suffix (which
+ *            matches) or be of the form "socket,pmuname" which will match
+ *            "socketX_pmunameY".
+ * @name: a real full PMU name as from sysfs.
+ */
+static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
+{
+	char *tmp = NULL, *tok, *str;
+	bool res;
+
+	if (strchr(pmu_name, ',') == NULL)
+		return perf_pmu__match_ignoring_suffix(name, pmu_name);
+
+	str = strdup(pmu_name);
+	if (!str)
+		return false;
+
+	/*
+	 * uncore alias may be from different PMU with common prefix
+	 */
+	tok = strtok_r(str, ",", &tmp);
+	if (strncmp(pmu_name, tok, strlen(tok))) {
+		res = false;
+		goto out;
+	}
+
+	/*
+	 * Match more complex aliases where the alias name is a comma-delimited
+	 * list of tokens, orderly contained in the matching PMU name.
+	 *
+	 * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
+	 *	    match "socket" in "socketX_pmunameY" and then "pmuname" in
+	 *	    "pmunameY".
+	 */
+	while (1) {
+		char *next_tok = strtok_r(NULL, ",", &tmp);
+
+		name = strstr(name, tok);
+		if (!name ||
+		    (!next_tok && !perf_pmu__match_ignoring_suffix(name, tok))) {
+			res = false;
+			goto out;
+		}
+		if (!next_tok)
+			break;
+		tok = next_tok;
+		name += strlen(tok);
+	}
+
+	res = true;
+out:
+	free(str);
+	return res;
+}
+
+static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
+					const struct pmu_events_table *table __maybe_unused,
+					void *vdata)
+{
+	struct perf_pmu *pmu = vdata;
+
+	perf_pmu__new_alias(pmu, pe->name, pe->desc, pe->event, /*val_fd=*/ NULL, pe);
+	return 0;
+}
+
+/*
+ * From the pmu_events_table, find the events that correspond to the given
+ * PMU and add them to the list 'head'.
+ */
+void pmu_add_cpu_aliases_table(struct perf_pmu *pmu, const struct pmu_events_table *table)
+{
+	pmu_events_table__for_each_event(table, pmu, pmu_add_cpu_aliases_map_callback, pmu);
+}
+
+static void pmu_add_cpu_aliases(struct perf_pmu *pmu)
+{
+	if (!pmu->events_table)
+		return;
+
+	if (pmu->cpu_aliases_added)
+		return;
+
+	pmu_add_cpu_aliases_table(pmu, pmu->events_table);
+	pmu->cpu_aliases_added = true;
+}
+
+static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
+				       const struct pmu_events_table *table __maybe_unused,
+				       void *vdata)
+{
+	struct perf_pmu *pmu = vdata;
+
+	if (!pe->compat || !pe->pmu)
+		return 0;
+
+	if (!strcmp(pmu->id, pe->compat) &&
+	    pmu_uncore_alias_match(pe->pmu, pmu->name)) {
+		perf_pmu__new_alias(pmu,
+				pe->name,
+				pe->desc,
+				pe->event,
+				/*val_fd=*/ NULL,
+				pe);
+	}
+
+	return 0;
+}
+
+void pmu_add_sys_aliases(struct perf_pmu *pmu)
+{
+	if (!pmu->id)
+		return;
+
+	pmu_for_each_sys_event(pmu_add_sys_aliases_iter_fn, pmu);
+}
+
+struct perf_event_attr * __weak
+perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
+{
+	return NULL;
+}
+
+const char * __weak
+pmu_find_real_name(const char *name)
+{
+	return name;
+}
+
+const char * __weak
+pmu_find_alias_name(const char *name __maybe_unused)
+{
+	return NULL;
+}
+
+static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
+{
+	int max_precise = -1;
+
+	perf_pmu__scan_file_at(pmu, dirfd, "caps/max_precise", "%d", &max_precise);
+	return max_precise;
+}
+
+struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name)
+{
+	struct perf_pmu *pmu;
+	__u32 type;
+	const char *name = pmu_find_real_name(lookup_name);
+	const char *alias_name;
+
+	pmu = zalloc(sizeof(*pmu));
+	if (!pmu)
+		return NULL;
+
+	pmu->name = strdup(name);
+	if (!pmu->name)
+		goto err;
+
+	/*
+	 * Read type early to fail fast if a lookup name isn't a PMU. Ensure
+	 * that type value is successfully assigned (return 1).
+	 */
+	if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
+		goto err;
+
+	INIT_LIST_HEAD(&pmu->format);
+	INIT_LIST_HEAD(&pmu->aliases);
+	INIT_LIST_HEAD(&pmu->caps);
+
+	/*
+	 * The pmu data we store & need consists of the pmu
+	 * type value and format definitions. Load both right
+	 * now.
+	 */
+	if (pmu_format(pmu, dirfd, name)) {
+		free(pmu);
+		return NULL;
+	}
+	pmu->is_core = is_pmu_core(name);
+	pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
+
+	alias_name = pmu_find_alias_name(name);
+	if (alias_name) {
+		pmu->alias_name = strdup(alias_name);
+		if (!pmu->alias_name)
+			goto err;
+	}
+
+	pmu->type = type;
+	pmu->is_uncore = pmu_is_uncore(dirfd, name);
+	if (pmu->is_uncore)
+		pmu->id = pmu_id(name);
+	pmu->max_precise = pmu_max_precise(dirfd, pmu);
+	pmu->events_table = perf_pmu__find_events_table(pmu);
+	pmu_add_sys_aliases(pmu);
+	list_add_tail(&pmu->list, pmus);
+
+	pmu->default_config = perf_pmu__get_default_config(pmu);
+
+	return pmu;
+err:
+	zfree(&pmu->name);
+	free(pmu);
+	return NULL;
+}
+
+/* Creates the PMU when sysfs scanning fails. */
+struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus)
+{
+	struct perf_pmu *pmu = zalloc(sizeof(*pmu));
+
+	if (!pmu)
+		return NULL;
+
+	pmu->name = strdup("cpu");
+	if (!pmu->name) {
+		free(pmu);
+		return NULL;
+	}
+
+	pmu->is_core = true;
+	pmu->type = PERF_TYPE_RAW;
+	pmu->cpus = cpu_map__online();
+
+	INIT_LIST_HEAD(&pmu->format);
+	INIT_LIST_HEAD(&pmu->aliases);
+	INIT_LIST_HEAD(&pmu->caps);
+	list_add_tail(&pmu->list, core_pmus);
+	return pmu;
+}
+
+void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
+{
+	struct perf_pmu_format *format;
+
+	if (pmu->formats_checked)
+		return;
+
+	pmu->formats_checked = true;
+
+	/* fake pmu doesn't have format list */
+	if (pmu == &perf_pmu__fake)
+		return;
+
+	list_for_each_entry(format, &pmu->format, list) {
+		perf_pmu_format__load(pmu, format);
+		if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) {
+			pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'"
+				   "which is not supported by this version of perf!\n",
+				   pmu->name, format->name, format->value);
+			return;
+		}
+	}
+}
+
+bool evsel__is_aux_event(const struct evsel *evsel)
+{
+	struct perf_pmu *pmu = evsel__find_pmu(evsel);
+
+	return pmu && pmu->auxtrace;
+}
+
+/*
+ * Set @config_name to @val as long as the user hasn't already set or cleared it
+ * by passing a config term on the command line.
+ *
+ * @val is the value to put into the bits specified by @config_name rather than
+ * the bit pattern. It is shifted into position by this function, so to set
+ * something to true, pass 1 for val rather than a pre shifted value.
+ */
+#define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask))
+void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
+				const char *config_name, u64 val)
+{
+	u64 user_bits = 0, bits;
+	struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
+
+	if (term)
+		user_bits = term->val.cfg_chg;
+
+	bits = perf_pmu__format_bits(pmu, config_name);
+
+	/* Do nothing if the user changed the value */
+	if (bits & user_bits)
+		return;
+
+	/* Otherwise replace it */
+	evsel->core.attr.config &= ~bits;
+	evsel->core.attr.config |= field_prep(bits, val);
+}
+
+static struct perf_pmu_format *
+pmu_find_format(struct list_head *formats, const char *name)
+{
+	struct perf_pmu_format *format;
+
+	list_for_each_entry(format, formats, list)
+		if (!strcmp(format->name, name))
+			return format;
+
+	return NULL;
+}
+
+__u64 perf_pmu__format_bits(struct perf_pmu *pmu, const char *name)
+{
+	struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
+	__u64 bits = 0;
+	int fbit;
+
+	if (!format)
+		return 0;
+
+	for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
+		bits |= 1ULL << fbit;
+
+	return bits;
+}
+
+int perf_pmu__format_type(struct perf_pmu *pmu, const char *name)
+{
+	struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
+
+	if (!format)
+		return -1;
+
+	perf_pmu_format__load(pmu, format);
+	return format->value;
+}
+
+/*
+ * Sets value based on the format definition (format parameter)
+ * and unformatted value (value parameter).
+ */
+static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
+			     bool zero)
+{
+	unsigned long fbit, vbit;
+
+	for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
+
+		if (!test_bit(fbit, format))
+			continue;
+
+		if (value & (1llu << vbit++))
+			*v |= (1llu << fbit);
+		else if (zero)
+			*v &= ~(1llu << fbit);
+	}
+}
+
+static __u64 pmu_format_max_value(const unsigned long *format)
+{
+	int w;
+
+	w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
+	if (!w)
+		return 0;
+	if (w < 64)
+		return (1ULL << w) - 1;
+	return -1;
+}
+
+/*
+ * Term is a string term, and might be a param-term. Try to look up it's value
+ * in the remaining terms.
+ * - We have a term like "base-or-format-term=param-term",
+ * - We need to find the value supplied for "param-term" (with param-term named
+ *   in a config string) later on in the term list.
+ */
+static int pmu_resolve_param_term(struct parse_events_term *term,
+				  struct list_head *head_terms,
+				  __u64 *value)
+{
+	struct parse_events_term *t;
+
+	list_for_each_entry(t, head_terms, list) {
+		if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
+		    t->config && !strcmp(t->config, term->config)) {
+			t->used = true;
+			*value = t->val.num;
+			return 0;
+		}
+	}
+
+	if (verbose > 0)
+		printf("Required parameter '%s' not specified\n", term->config);
+
+	return -1;
+}
+
+static char *pmu_formats_string(struct list_head *formats)
+{
+	struct perf_pmu_format *format;
+	char *str = NULL;
+	struct strbuf buf = STRBUF_INIT;
+	unsigned int i = 0;
+
+	if (!formats)
+		return NULL;
+
+	/* sysfs exported terms */
+	list_for_each_entry(format, formats, list)
+		if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
+			goto error;
+
+	str = strbuf_detach(&buf, NULL);
+error:
+	strbuf_release(&buf);
+
+	return str;
+}
+
+/*
+ * Setup one of config[12] attr members based on the
+ * user input data - term parameter.
+ */
+static int pmu_config_term(struct perf_pmu *pmu,
+			   struct perf_event_attr *attr,
+			   struct parse_events_term *term,
+			   struct list_head *head_terms,
+			   bool zero, struct parse_events_error *err)
+{
+	struct perf_pmu_format *format;
+	__u64 *vp;
+	__u64 val, max_val;
+
+	/*
+	 * If this is a parameter we've already used for parameterized-eval,
+	 * skip it in normal eval.
+	 */
+	if (term->used)
+		return 0;
+
+	/*
+	 * Hardcoded terms should be already in, so nothing
+	 * to be done for them.
+	 */
+	if (parse_events__is_hardcoded_term(term))
+		return 0;
+
+	format = pmu_find_format(&pmu->format, term->config);
+	if (!format) {
+		char *pmu_term = pmu_formats_string(&pmu->format);
+		char *unknown_term;
+		char *help_msg;
+
+		if (asprintf(&unknown_term,
+				"unknown term '%s' for pmu '%s'",
+				term->config, pmu->name) < 0)
+			unknown_term = NULL;
+		help_msg = parse_events_formats_error_string(pmu_term);
+		if (err) {
+			parse_events_error__handle(err, term->err_term,
+						   unknown_term,
+						   help_msg);
+		} else {
+			pr_debug("%s (%s)\n", unknown_term, help_msg);
+			free(unknown_term);
+		}
+		free(pmu_term);
+		return -EINVAL;
+	}
+	perf_pmu_format__load(pmu, format);
+	switch (format->value) {
+	case PERF_PMU_FORMAT_VALUE_CONFIG:
+		vp = &attr->config;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG1:
+		vp = &attr->config1;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG2:
+		vp = &attr->config2;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG3:
+		vp = &attr->config3;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/*
+	 * Either directly use a numeric term, or try to translate string terms
+	 * using event parameters.
+	 */
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
+		if (term->no_value &&
+		    bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
+			if (err) {
+				parse_events_error__handle(err, term->err_val,
+					   strdup("no value assigned for term"),
+					   NULL);
+			}
+			return -EINVAL;
+		}
+
+		val = term->val.num;
+	} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
+		if (strcmp(term->val.str, "?")) {
+			if (verbose > 0) {
+				pr_info("Invalid sysfs entry %s=%s\n",
+						term->config, term->val.str);
+			}
+			if (err) {
+				parse_events_error__handle(err, term->err_val,
+					strdup("expected numeric value"),
+					NULL);
+			}
+			return -EINVAL;
+		}
+
+		if (pmu_resolve_param_term(term, head_terms, &val))
+			return -EINVAL;
+	} else
+		return -EINVAL;
+
+	max_val = pmu_format_max_value(format->bits);
+	if (val > max_val) {
+		if (err) {
+			char *err_str;
+
+			parse_events_error__handle(err, term->err_val,
+				asprintf(&err_str,
+				    "value too big for format, maximum is %llu",
+				    (unsigned long long)max_val) < 0
+				    ? strdup("value too big for format")
+				    : err_str,
+				    NULL);
+			return -EINVAL;
+		}
+		/*
+		 * Assume we don't care if !err, in which case the value will be
+		 * silently truncated.
+		 */
+	}
+
+	pmu_format_value(format->bits, val, vp, zero);
+	return 0;
+}
+
+int perf_pmu__config_terms(struct perf_pmu *pmu,
+			   struct perf_event_attr *attr,
+			   struct list_head *head_terms,
+			   bool zero, struct parse_events_error *err)
+{
+	struct parse_events_term *term;
+
+	list_for_each_entry(term, head_terms, list) {
+		if (pmu_config_term(pmu, attr, term, head_terms, zero, err))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Configures event's 'attr' parameter based on the:
+ * 1) users input - specified in terms parameter
+ * 2) pmu format definitions - specified by pmu parameter
+ */
+int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
+		     struct list_head *head_terms,
+		     struct parse_events_error *err)
+{
+	bool zero = !!pmu->default_config;
+
+	return perf_pmu__config_terms(pmu, attr, head_terms, zero, err);
+}
+
+static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
+					     struct parse_events_term *term)
+{
+	struct perf_pmu_alias *alias;
+	const char *name;
+
+	if (parse_events__is_hardcoded_term(term))
+		return NULL;
+
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
+		if (!term->no_value)
+			return NULL;
+		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;
+		name = term->val.str;
+	} else {
+		return NULL;
+	}
+
+	alias = perf_pmu__find_alias(pmu, name, /*load=*/ true);
+	if (alias || pmu->cpu_aliases_added)
+		return alias;
+
+	/* Alias doesn't exist, try to get it from the json events. */
+	if (pmu->events_table &&
+	    pmu_events_table__find_event(pmu->events_table, pmu, name,
+				         pmu_add_cpu_aliases_map_callback,
+				         pmu) == 0) {
+		alias = perf_pmu__find_alias(pmu, name, /*load=*/ false);
+	}
+	return alias;
+}
+
+
+static int check_info_data(struct perf_pmu *pmu,
+			   struct perf_pmu_alias *alias,
+			   struct perf_pmu_info *info,
+			   struct parse_events_error *err,
+			   int column)
+{
+	read_alias_info(pmu, alias);
+	/*
+	 * Only one term in event definition can
+	 * define unit, scale and snapshot, fail
+	 * if there's more than one.
+	 */
+	if (info->unit && alias->unit[0]) {
+		parse_events_error__handle(err, column,
+					strdup("Attempt to set event's unit twice"),
+					NULL);
+		return -EINVAL;
+	}
+	if (info->scale && alias->scale) {
+		parse_events_error__handle(err, column,
+					strdup("Attempt to set event's scale twice"),
+					NULL);
+		return -EINVAL;
+	}
+	if (info->snapshot && alias->snapshot) {
+		parse_events_error__handle(err, column,
+					strdup("Attempt to set event snapshot twice"),
+					NULL);
+		return -EINVAL;
+	}
+
+	if (alias->unit[0])
+		info->unit = alias->unit;
+
+	if (alias->scale)
+		info->scale = alias->scale;
+
+	if (alias->snapshot)
+		info->snapshot = alias->snapshot;
+
+	return 0;
+}
+
+/*
+ * Find alias in the terms list and replace it with the terms
+ * defined for the alias
+ */
+int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
+			  struct perf_pmu_info *info, struct parse_events_error *err)
+{
+	struct parse_events_term *term, *h;
+	struct perf_pmu_alias *alias;
+	int ret;
+
+	info->per_pkg = false;
+
+	/*
+	 * Mark unit and scale as not set
+	 * (different from default values, see below)
+	 */
+	info->unit     = NULL;
+	info->scale    = 0.0;
+	info->snapshot = false;
+
+	list_for_each_entry_safe(term, h, head_terms, list) {
+		alias = pmu_find_alias(pmu, term);
+		if (!alias)
+			continue;
+		ret = pmu_alias_terms(alias, &term->list);
+		if (ret) {
+			parse_events_error__handle(err, term->err_term,
+						strdup("Failure to duplicate terms"),
+						NULL);
+			return ret;
+		}
+
+		ret = check_info_data(pmu, alias, info, err, term->err_term);
+		if (ret)
+			return ret;
+
+		if (alias->per_pkg)
+			info->per_pkg = true;
+
+		list_del_init(&term->list);
+		parse_events_term__delete(term);
+	}
+
+	/*
+	 * if no unit or scale found in aliases, then
+	 * set defaults as for evsel
+	 * unit cannot left to NULL
+	 */
+	if (info->unit == NULL)
+		info->unit   = "";
+
+	if (info->scale == 0.0)
+		info->scale  = 1.0;
+
+	return 0;
+}
+
+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 find_event_args *args = state;
+
+	if (!strcmp(args->event, info->name))
+		return args->cb(args->state, info);
+
+	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,
+	};
+
+	/* Sub-optimal, but function is only used by tests. */
+	return perf_pmu__for_each_event(pmu, /*skip_duplicate_pmus=*/ false,
+					&args, find_event_callback);
+}
+
+static void perf_pmu__del_formats(struct list_head *formats)
+{
+	struct perf_pmu_format *fmt, *tmp;
+
+	list_for_each_entry_safe(fmt, tmp, formats, list) {
+		list_del(&fmt->list);
+		zfree(&fmt->name);
+		free(fmt);
+	}
+}
+
+bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
+{
+	struct perf_pmu_format *format;
+
+	list_for_each_entry(format, &pmu->format, list) {
+		if (!strcmp(format->name, name))
+			return true;
+	}
+	return false;
+}
+
+bool is_pmu_core(const char *name)
+{
+	return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
+}
+
+bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
+{
+	return pmu->is_core;
+}
+
+bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
+{
+	return !pmu->is_core || perf_pmus__num_core_pmus() == 1;
+}
+
+bool perf_pmu__have_event(struct perf_pmu *pmu, const char *name)
+{
+	if (perf_pmu__find_alias(pmu, name, /*load=*/ true) != NULL)
+		return true;
+	if (pmu->cpu_aliases_added || !pmu->events_table)
+		return false;
+	return pmu_events_table__find_event(pmu->events_table, pmu, name, NULL, NULL) == 0;
+}
+
+size_t perf_pmu__num_events(struct perf_pmu *pmu)
+{
+	size_t nr;
+
+	if (!pmu->sysfs_aliases_loaded)
+		pmu_aliases_parse(pmu);
+
+	nr = pmu->sysfs_aliases;
+
+	if (pmu->cpu_aliases_added)
+		 nr += pmu->loaded_json_aliases;
+	else if (pmu->events_table)
+		nr += pmu_events_table__num_events(pmu->events_table, pmu) - pmu->loaded_json_aliases;
+
+	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, bool skip_duplicate_pmus)
+{
+	struct parse_events_term *term;
+	int pmu_name_len = skip_duplicate_pmus
+		? pmu_name_len_no_suffix(pmu->name, /*num=*/NULL)
+		: (int)strlen(pmu->name);
+	int used = snprintf(buf, len, "%.*s/%s", pmu_name_len, 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);
+	}
+
+	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(struct perf_pmu *pmu, bool skip_duplicate_pmus,
+			     void *state, pmu_event_callback cb)
+{
+	char buf[1024];
+	struct perf_pmu_alias *event;
+	struct pmu_event_info info = {
+		.pmu = pmu,
+	};
+	int ret = 0;
+	struct strbuf sb;
+
+	strbuf_init(&sb, /*hint=*/ 0);
+	pmu_add_cpu_aliases(pmu);
+	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,
+						 skip_duplicate_pmus);
+			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;
+		parse_events_term__to_strbuf(&event->terms, &sb);
+		buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
+				"%s/%s/", info.pmu_name, sb.buf) + 1;
+		info.topic = event->topic;
+		info.str = sb.buf;
+		info.deprecated = event->deprecated;
+		ret = cb(state, &info);
+		if (ret)
+			goto out;
+		strbuf_setlen(&sb, /*len=*/ 0);
+	}
+	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);
+	}
+out:
+	strbuf_release(&sb);
+	return ret;
+}
+
+bool pmu__name_match(const struct perf_pmu *pmu, const char *pmu_name)
+{
+	return !strcmp(pmu->name, pmu_name) ||
+		(pmu->is_uncore && pmu_uncore_alias_match(pmu_name, pmu->name)) ||
+		/*
+		 * jevents and tests use default_core as a marker for any core
+		 * PMU as the PMU name varies across architectures.
+		 */
+	        (pmu->is_core && !strcmp(pmu_name, "default_core"));
+}
+
+bool perf_pmu__is_software(const struct perf_pmu *pmu)
+{
+	if (pmu->is_core || pmu->is_uncore || pmu->auxtrace)
+		return false;
+	switch (pmu->type) {
+	case PERF_TYPE_HARDWARE:	return false;
+	case PERF_TYPE_SOFTWARE:	return true;
+	case PERF_TYPE_TRACEPOINT:	return true;
+	case PERF_TYPE_HW_CACHE:	return false;
+	case PERF_TYPE_RAW:		return false;
+	case PERF_TYPE_BREAKPOINT:	return true;
+	default: break;
+	}
+	return !strcmp(pmu->name, "kprobe") || !strcmp(pmu->name, "uprobe");
+}
+
+FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
+{
+	char path[PATH_MAX];
+
+	if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name) ||
+	    !file_available(path))
+		return NULL;
+
+	return fopen(path, "r");
+}
+
+FILE *perf_pmu__open_file_at(struct perf_pmu *pmu, int dirfd, const char *name)
+{
+	int fd;
+
+	fd = perf_pmu__pathname_fd(dirfd, pmu->name, name, O_RDONLY);
+	if (fd < 0)
+		return NULL;
+
+	return fdopen(fd, "r");
+}
+
+int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
+			...)
+{
+	va_list args;
+	FILE *file;
+	int ret = EOF;
+
+	va_start(args, fmt);
+	file = perf_pmu__open_file(pmu, name);
+	if (file) {
+		ret = vfscanf(file, fmt, args);
+		fclose(file);
+	}
+	va_end(args);
+	return ret;
+}
+
+int perf_pmu__scan_file_at(struct perf_pmu *pmu, int dirfd, const char *name,
+			   const char *fmt, ...)
+{
+	va_list args;
+	FILE *file;
+	int ret = EOF;
+
+	va_start(args, fmt);
+	file = perf_pmu__open_file_at(pmu, dirfd, name);
+	if (file) {
+		ret = vfscanf(file, fmt, args);
+		fclose(file);
+	}
+	va_end(args);
+	return ret;
+}
+
+bool perf_pmu__file_exists(struct perf_pmu *pmu, const char *name)
+{
+	char path[PATH_MAX];
+
+	if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name))
+		return false;
+
+	return file_available(path);
+}
+
+static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
+{
+	struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
+
+	if (!caps)
+		return -ENOMEM;
+
+	caps->name = strdup(name);
+	if (!caps->name)
+		goto free_caps;
+	caps->value = strndup(value, strlen(value) - 1);
+	if (!caps->value)
+		goto free_name;
+	list_add_tail(&caps->list, list);
+	return 0;
+
+free_name:
+	zfree(&caps->name);
+free_caps:
+	free(caps);
+
+	return -ENOMEM;
+}
+
+static void perf_pmu__del_caps(struct perf_pmu *pmu)
+{
+	struct perf_pmu_caps *caps, *tmp;
+
+	list_for_each_entry_safe(caps, tmp, &pmu->caps, list) {
+		list_del(&caps->list);
+		zfree(&caps->name);
+		zfree(&caps->value);
+		free(caps);
+	}
+}
+
+/*
+ * Reading/parsing the given pmu capabilities, which should be located at:
+ * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
+ * Return the number of capabilities
+ */
+int perf_pmu__caps_parse(struct perf_pmu *pmu)
+{
+	struct stat st;
+	char caps_path[PATH_MAX];
+	DIR *caps_dir;
+	struct dirent *evt_ent;
+	int caps_fd;
+
+	if (pmu->caps_initialized)
+		return pmu->nr_caps;
+
+	pmu->nr_caps = 0;
+
+	if (!perf_pmu__pathname_scnprintf(caps_path, sizeof(caps_path), pmu->name, "caps"))
+		return -1;
+
+	if (stat(caps_path, &st) < 0) {
+		pmu->caps_initialized = true;
+		return 0;	/* no error if caps does not exist */
+	}
+
+	caps_dir = opendir(caps_path);
+	if (!caps_dir)
+		return -EINVAL;
+
+	caps_fd = dirfd(caps_dir);
+
+	while ((evt_ent = readdir(caps_dir)) != NULL) {
+		char *name = evt_ent->d_name;
+		char value[128];
+		FILE *file;
+		int fd;
+
+		if (!strcmp(name, ".") || !strcmp(name, ".."))
+			continue;
+
+		fd = openat(caps_fd, name, O_RDONLY);
+		if (fd == -1)
+			continue;
+		file = fdopen(fd, "r");
+		if (!file) {
+			close(fd);
+			continue;
+		}
+
+		if (!fgets(value, sizeof(value), file) ||
+		    (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
+			fclose(file);
+			continue;
+		}
+
+		pmu->nr_caps++;
+		fclose(file);
+	}
+
+	closedir(caps_dir);
+
+	pmu->caps_initialized = true;
+	return pmu->nr_caps;
+}
+
+static void perf_pmu__compute_config_masks(struct perf_pmu *pmu)
+{
+	struct perf_pmu_format *format;
+
+	if (pmu->config_masks_computed)
+		return;
+
+	list_for_each_entry(format, &pmu->format, list)	{
+		unsigned int i;
+		__u64 *mask;
+
+		if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END)
+			continue;
+
+		pmu->config_masks_present = true;
+		mask = &pmu->config_masks[format->value];
+
+		for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
+			*mask |= 1ULL << i;
+	}
+	pmu->config_masks_computed = true;
+}
+
+void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
+				   const char *name, int config_num,
+				   const char *config_name)
+{
+	__u64 bits;
+	char buf[100];
+
+	perf_pmu__compute_config_masks(pmu);
+
+	/*
+	 * Kernel doesn't export any valid format bits.
+	 */
+	if (!pmu->config_masks_present)
+		return;
+
+	bits = config & ~pmu->config_masks[config_num];
+	if (bits == 0)
+		return;
+
+	bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf));
+
+	pr_warning("WARNING: event '%s' not valid (bits %s of %s "
+		   "'%llx' not supported by kernel)!\n",
+		   name ?: "N/A", buf, config_name, config);
+}
+
+int perf_pmu__match(const char *pattern, const char *name, const char *tok)
+{
+	if (!name)
+		return -1;
+
+	if (fnmatch(pattern, name, 0))
+		return -1;
+
+	if (tok && !perf_pmu__match_ignoring_suffix(name, tok))
+		return -1;
+
+	return 0;
+}
+
+double __weak perf_pmu__cpu_slots_per_cycle(void)
+{
+	return NAN;
+}
+
+int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size)
+{
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return 0;
+	return scnprintf(pathname, size, "%s/bus/event_source/devices/", sysfs);
+}
+
+int perf_pmu__event_source_devices_fd(void)
+{
+	char path[PATH_MAX];
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return -1;
+
+	scnprintf(path, sizeof(path), "%s/bus/event_source/devices/", sysfs);
+	return open(path, O_DIRECTORY);
+}
+
+/*
+ * Fill 'buf' with the path to a file or folder in 'pmu_name' in
+ * sysfs. For example if pmu_name = "cs_etm" and 'filename' = "format"
+ * then pathname will be filled with
+ * "/sys/bus/event_source/devices/cs_etm/format"
+ *
+ * Return 0 if the sysfs mountpoint couldn't be found, if no characters were
+ * written or if the buffer size is exceeded.
+ */
+int perf_pmu__pathname_scnprintf(char *buf, size_t size,
+				 const char *pmu_name, const char *filename)
+{
+	size_t len;
+
+	len = perf_pmu__event_source_devices_scnprintf(buf, size);
+	if (!len || (len + strlen(pmu_name) + strlen(filename) + 1)  >= size)
+		return 0;
+
+	return scnprintf(buf + len, size - len, "%s/%s", pmu_name, filename);
+}
+
+int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags)
+{
+	char path[PATH_MAX];
+
+	scnprintf(path, sizeof(path), "%s/%s", pmu_name, filename);
+	return openat(dirfd, path, flags);
+}
+
+void perf_pmu__delete(struct perf_pmu *pmu)
+{
+	perf_pmu__del_formats(&pmu->format);
+	perf_pmu__del_aliases(pmu);
+	perf_pmu__del_caps(pmu);
+
+	perf_cpu_map__put(pmu->cpus);
+
+	zfree(&pmu->default_config);
+	zfree(&pmu->name);
+	zfree(&pmu->alias_name);
+	zfree(&pmu->id);
+	free(pmu);
+}
+
+struct perf_pmu *pmu__find_core_pmu(void)
+{
+	struct perf_pmu *pmu = NULL;
+
+	while ((pmu = perf_pmus__scan_core(pmu))) {
+		/*
+		 * The cpumap should cover all CPUs. Otherwise, some CPUs may
+		 * not support some events or have different event IDs.
+		 */
+		if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu)
+			return NULL;
+
+		return pmu;
+	}
+	return NULL;
+}