Adding upstream version 5.10.209.upstream/5.10.209

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

1 files changed, 1768 insertions, 0 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
new file mode 100644
index 000000000..d322305bc
--- /dev/null
+++ b/tools/perf/util/pmu.c
@@ -0,0 +1,1768 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/list.h>
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+#include <subcmd/pager.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <dirent.h>
+#include <api/fs/fs.h>
+#include <locale.h>
+#include <regex.h>
+#include <perf/cpumap.h>
+#include "debug.h"
+#include "evsel.h"
+#include "pmu.h"
+#include "parse-events.h"
+#include "header.h"
+#include "string2.h"
+#include "strbuf.h"
+#include "fncache.h"
+
+struct perf_pmu perf_pmu__fake;
+
+struct perf_pmu_format {
+	char *name;
+	int value;
+	DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
+	struct list_head list;
+};
+
+int perf_pmu_parse(struct list_head *list, char *name);
+extern FILE *perf_pmu_in;
+
+static LIST_HEAD(pmus);
+
+/*
+ * Parse & process all the sysfs attributes located under
+ * the directory specified in 'dir' parameter.
+ */
+int perf_pmu__format_parse(char *dir, struct list_head *head)
+{
+	struct dirent *evt_ent;
+	DIR *format_dir;
+	int ret = 0;
+
+	format_dir = opendir(dir);
+	if (!format_dir)
+		return -EINVAL;
+
+	while (!ret && (evt_ent = readdir(format_dir))) {
+		char path[PATH_MAX];
+		char *name = evt_ent->d_name;
+		FILE *file;
+
+		if (!strcmp(name, ".") || !strcmp(name, ".."))
+			continue;
+
+		snprintf(path, PATH_MAX, "%s/%s", dir, name);
+
+		ret = -EINVAL;
+		file = fopen(path, "r");
+		if (!file)
+			break;
+
+		perf_pmu_in = file;
+		ret = perf_pmu_parse(head, name);
+		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(const char *name, struct list_head *format)
+{
+	char path[PATH_MAX];
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return -1;
+
+	snprintf(path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
+
+	if (!file_available(path))
+		return 0;
+
+	if (perf_pmu__format_parse(path, format))
+		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_alias *alias, char *dir, char *name)
+{
+	struct stat st;
+	ssize_t sret;
+	char scale[128];
+	int fd, ret = -1;
+	char path[PATH_MAX];
+
+	scnprintf(path, PATH_MAX, "%s/%s.scale", dir, 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_alias *alias, char *dir, char *name)
+{
+	char path[PATH_MAX];
+	ssize_t sret;
+	int fd;
+
+	scnprintf(path, PATH_MAX, "%s/%s.unit", dir, 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_alias *alias, char *dir, char *name)
+{
+	char path[PATH_MAX];
+	int fd;
+
+	scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, 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_alias *alias,
+				    char *dir, char *name)
+{
+	char path[PATH_MAX];
+	int fd;
+
+	scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	alias->snapshot = true;
+	close(fd);
+	return 0;
+}
+
+static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
+				char **new_str)
+{
+	if (!*old_str)
+		goto set_new;
+
+	if (*new_str) {	/* Have new string, check with old */
+		if (strcasecmp(*old_str, *new_str))
+			pr_debug("alias %s differs in field '%s'\n",
+				 name, field);
+		zfree(old_str);
+	} else		/* Nothing new --> keep old string */
+		return;
+set_new:
+	*old_str = *new_str;
+	*new_str = NULL;
+}
+
+static void perf_pmu_update_alias(struct perf_pmu_alias *old,
+				  struct perf_pmu_alias *newalias)
+{
+	perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
+	perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
+			    &newalias->long_desc);
+	perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
+	perf_pmu_assign_str(old->name, "metric_expr", &old->metric_expr,
+			    &newalias->metric_expr);
+	perf_pmu_assign_str(old->name, "metric_name", &old->metric_name,
+			    &newalias->metric_name);
+	perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
+	old->scale = newalias->scale;
+	old->per_pkg = newalias->per_pkg;
+	old->snapshot = newalias->snapshot;
+	memcpy(old->unit, newalias->unit, sizeof(old->unit));
+}
+
+/* Delete an alias entry. */
+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->str);
+	zfree(&newalias->metric_expr);
+	zfree(&newalias->metric_name);
+	parse_events_terms__purge(&newalias->terms);
+	free(newalias);
+}
+
+/* Merge an alias, search in alias list. If this name is already
+ * present merge both of them to combine all information.
+ */
+static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
+				 struct list_head *alist)
+{
+	struct perf_pmu_alias *a;
+
+	list_for_each_entry(a, alist, list) {
+		if (!strcasecmp(newalias->name, a->name)) {
+			perf_pmu_update_alias(a, newalias);
+			perf_pmu_free_alias(newalias);
+			return true;
+		}
+	}
+	return false;
+}
+
+static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
+				 char *desc, char *val,
+				 char *long_desc, char *topic,
+				 char *unit, char *perpkg,
+				 char *metric_expr,
+				 char *metric_name,
+				 char *deprecated)
+{
+	struct parse_events_term *term;
+	struct perf_pmu_alias *alias;
+	int ret;
+	int num;
+	char newval[256];
+
+	alias = malloc(sizeof(*alias));
+	if (!alias)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&alias->terms);
+	alias->scale = 1.0;
+	alias->unit[0] = '\0';
+	alias->per_pkg = false;
+	alias->snapshot = false;
+	alias->deprecated = false;
+
+	ret = parse_events_terms(&alias->terms, val);
+	if (ret) {
+		pr_err("Cannot parse alias %s: %d\n", val, ret);
+		free(alias);
+		return ret;
+	}
+
+	/* Scan event and remove leading zeroes, spaces, newlines, some
+	 * platforms have terms specified as
+	 * event=0x0091 (read from files ../<PMU>/events/<FILE>
+	 * and terms specified as event=0x91 (read from JSON files).
+	 *
+	 * Rebuild string to make alias->str member comparable.
+	 */
+	memset(newval, 0, sizeof(newval));
+	ret = 0;
+	list_for_each_entry(term, &alias->terms, list) {
+		if (ret)
+			ret += scnprintf(newval + ret, sizeof(newval) - ret,
+					 ",");
+		if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
+			ret += scnprintf(newval + ret, sizeof(newval) - ret,
+					 "%s=%#x", term->config, term->val.num);
+		else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
+			ret += scnprintf(newval + ret, sizeof(newval) - ret,
+					 "%s=%s", term->config, term->val.str);
+	}
+
+	alias->name = strdup(name);
+	if (dir) {
+		/*
+		 * load unit name and scale if available
+		 */
+		perf_pmu__parse_unit(alias, dir, name);
+		perf_pmu__parse_scale(alias, dir, name);
+		perf_pmu__parse_per_pkg(alias, dir, name);
+		perf_pmu__parse_snapshot(alias, dir, name);
+	}
+
+	alias->metric_expr = metric_expr ? strdup(metric_expr) : NULL;
+	alias->metric_name = metric_name ? strdup(metric_name): NULL;
+	alias->desc = desc ? strdup(desc) : NULL;
+	alias->long_desc = long_desc ? strdup(long_desc) :
+				desc ? strdup(desc) : NULL;
+	alias->topic = topic ? strdup(topic) : NULL;
+	if (unit) {
+		if (perf_pmu__convert_scale(unit, &unit, &alias->scale) < 0)
+			return -1;
+		snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
+	}
+	alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
+	alias->str = strdup(newval);
+
+	if (deprecated)
+		alias->deprecated = true;
+
+	if (!perf_pmu_merge_alias(alias, list))
+		list_add_tail(&alias->list, list);
+
+	return 0;
+}
+
+static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
+{
+	char buf[256];
+	int ret;
+
+	ret = fread(buf, 1, sizeof(buf), file);
+	if (ret == 0)
+		return -EINVAL;
+
+	buf[ret] = 0;
+
+	/* Remove trailing newline from sysfs file */
+	strim(buf);
+
+	return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
+				     NULL, NULL, NULL, NULL);
+}
+
+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;
+}
+
+/*
+ * Process all the sysfs attributes located under the directory
+ * specified in 'dir' parameter.
+ */
+static int pmu_aliases_parse(char *dir, struct list_head *head)
+{
+	struct dirent *evt_ent;
+	DIR *event_dir;
+
+	event_dir = opendir(dir);
+	if (!event_dir)
+		return -EINVAL;
+
+	while ((evt_ent = readdir(event_dir))) {
+		char path[PATH_MAX];
+		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;
+
+		scnprintf(path, PATH_MAX, "%s/%s", dir, name);
+
+		file = fopen(path, "r");
+		if (!file) {
+			pr_debug("Cannot open %s\n", path);
+			continue;
+		}
+
+		if (perf_pmu__new_alias(head, dir, name, file) < 0)
+			pr_debug("Cannot set up %s\n", name);
+		fclose(file);
+	}
+
+	closedir(event_dir);
+	return 0;
+}
+
+/*
+ * 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(const char *name, struct list_head *head)
+{
+	char path[PATH_MAX];
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return -1;
+
+	snprintf(path, PATH_MAX,
+		 "%s/bus/event_source/devices/%s/events", sysfs, name);
+
+	if (!file_available(path))
+		return 0;
+
+	if (pmu_aliases_parse(path, head))
+		return -1;
+
+	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;
+}
+
+/*
+ * Reading/parsing the default pmu type value, which should be
+ * located at:
+ * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
+ */
+static int pmu_type(const char *name, __u32 *type)
+{
+	char path[PATH_MAX];
+	FILE *file;
+	int ret = 0;
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return -1;
+
+	snprintf(path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
+
+	if (access(path, R_OK) < 0)
+		return -1;
+
+	file = fopen(path, "r");
+	if (!file)
+		return -EINVAL;
+
+	if (1 != fscanf(file, "%u", type))
+		ret = -1;
+
+	fclose(file);
+	return ret;
+}
+
+/* Add all pmus in sysfs to pmu list: */
+static void pmu_read_sysfs(void)
+{
+	char path[PATH_MAX];
+	DIR *dir;
+	struct dirent *dent;
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return;
+
+	snprintf(path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
+
+	dir = opendir(path);
+	if (!dir)
+		return;
+
+	while ((dent = readdir(dir))) {
+		if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
+			continue;
+		/* add to static LIST_HEAD(pmus): */
+		perf_pmu__find(dent->d_name);
+	}
+
+	closedir(dir);
+}
+
+static struct perf_cpu_map *__pmu_cpumask(const char *path)
+{
+	FILE *file;
+	struct perf_cpu_map *cpus;
+
+	file = fopen(path, "r");
+	if (!file)
+		return NULL;
+
+	cpus = perf_cpu_map__read(file);
+	fclose(file);
+	return cpus;
+}
+
+/*
+ * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
+ * may have a "cpus" file.
+ */
+#define CPUS_TEMPLATE_UNCORE	"%s/bus/event_source/devices/%s/cpumask"
+#define CPUS_TEMPLATE_CPU	"%s/bus/event_source/devices/%s/cpus"
+
+static struct perf_cpu_map *pmu_cpumask(const char *name)
+{
+	char path[PATH_MAX];
+	struct perf_cpu_map *cpus;
+	const char *sysfs = sysfs__mountpoint();
+	const char *templates[] = {
+		CPUS_TEMPLATE_UNCORE,
+		CPUS_TEMPLATE_CPU,
+		NULL
+	};
+	const char **template;
+
+	if (!sysfs)
+		return NULL;
+
+	for (template = templates; *template; template++) {
+		snprintf(path, PATH_MAX, *template, sysfs, name);
+		cpus = __pmu_cpumask(path);
+		if (cpus)
+			return cpus;
+	}
+
+	return NULL;
+}
+
+static bool pmu_is_uncore(const char *name)
+{
+	char path[PATH_MAX];
+	const char *sysfs;
+
+	sysfs = sysfs__mountpoint();
+	snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
+	return file_available(path);
+}
+
+/*
+ *  PMU CORE devices have different name other than cpu in sysfs on some
+ *  platforms.
+ *  Looking for possible sysfs files to identify the arm core device.
+ */
+static int is_arm_pmu_core(const char *name)
+{
+	char path[PATH_MAX];
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs)
+		return 0;
+
+	/* Look for cpu sysfs (specific to arm) */
+	scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
+				sysfs, name);
+	return file_available(path);
+}
+
+static 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;
+}
+
+struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
+{
+	struct pmu_events_map *map;
+	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 (;;) {
+		map = &pmu_events_map[i++];
+		if (!map->table) {
+			map = NULL;
+			break;
+		}
+
+		if (!strcmp_cpuid_str(map->cpuid, cpuid))
+			break;
+	}
+	free(cpuid);
+	return map;
+}
+
+bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
+{
+	char *tmp = NULL, *tok, *str;
+	bool res;
+
+	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".
+	 */
+	for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
+		name = strstr(name, tok);
+		if (!name) {
+			res = false;
+			goto out;
+		}
+	}
+
+	res = true;
+out:
+	free(str);
+	return res;
+}
+
+/*
+ * From the pmu_events_map, find the table of PMU events that corresponds
+ * to the current running CPU. Then, add all PMU events from that table
+ * as aliases.
+ */
+void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
+			     struct pmu_events_map *map)
+{
+	int i;
+	const char *name = pmu->name;
+	/*
+	 * Found a matching PMU events table. Create aliases
+	 */
+	i = 0;
+	while (1) {
+		const char *cpu_name = is_arm_pmu_core(name) ? name : "cpu";
+		struct pmu_event *pe = &map->table[i++];
+		const char *pname = pe->pmu ? pe->pmu : cpu_name;
+
+		if (!pe->name) {
+			if (pe->metric_group || pe->metric_name)
+				continue;
+			break;
+		}
+
+		if (pmu_is_uncore(name) &&
+		    pmu_uncore_alias_match(pname, name))
+			goto new_alias;
+
+		if (strcmp(pname, name))
+			continue;
+
+new_alias:
+		/* need type casts to override 'const' */
+		__perf_pmu__new_alias(head, NULL, (char *)pe->name,
+				(char *)pe->desc, (char *)pe->event,
+				(char *)pe->long_desc, (char *)pe->topic,
+				(char *)pe->unit, (char *)pe->perpkg,
+				(char *)pe->metric_expr,
+				(char *)pe->metric_name,
+				(char *)pe->deprecated);
+	}
+}
+
+static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
+{
+	struct pmu_events_map *map;
+
+	map = perf_pmu__find_map(pmu);
+	if (!map)
+		return;
+
+	pmu_add_cpu_aliases_map(head, pmu, map);
+}
+
+struct perf_event_attr * __weak
+perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
+{
+	return NULL;
+}
+
+static int pmu_max_precise(const char *name)
+{
+	char path[PATH_MAX];
+	int max_precise = -1;
+
+	scnprintf(path, PATH_MAX,
+		 "bus/event_source/devices/%s/caps/max_precise",
+		 name);
+
+	sysfs__read_int(path, &max_precise);
+	return max_precise;
+}
+
+static struct perf_pmu *pmu_lookup(const char *name)
+{
+	struct perf_pmu *pmu;
+	LIST_HEAD(format);
+	LIST_HEAD(aliases);
+	__u32 type;
+
+	/*
+	 * The pmu data we store & need consists of the pmu
+	 * type value and format definitions. Load both right
+	 * now.
+	 */
+	if (pmu_format(name, &format))
+		return NULL;
+
+	/*
+	 * Check the type first to avoid unnecessary work.
+	 */
+	if (pmu_type(name, &type))
+		return NULL;
+
+	if (pmu_aliases(name, &aliases))
+		return NULL;
+
+	pmu = zalloc(sizeof(*pmu));
+	if (!pmu)
+		return NULL;
+
+	pmu->cpus = pmu_cpumask(name);
+	pmu->name = strdup(name);
+	pmu->type = type;
+	pmu->is_uncore = pmu_is_uncore(name);
+	pmu->max_precise = pmu_max_precise(name);
+	pmu_add_cpu_aliases(&aliases, pmu);
+
+	INIT_LIST_HEAD(&pmu->format);
+	INIT_LIST_HEAD(&pmu->aliases);
+	INIT_LIST_HEAD(&pmu->caps);
+	list_splice(&format, &pmu->format);
+	list_splice(&aliases, &pmu->aliases);
+	list_add_tail(&pmu->list, &pmus);
+
+	pmu->default_config = perf_pmu__get_default_config(pmu);
+
+	return pmu;
+}
+
+void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
+{
+	struct perf_pmu_format *format;
+
+	/* fake pmu doesn't have format list */
+	if (pmu == &perf_pmu__fake)
+		return;
+
+	list_for_each_entry(format, &pmu->format, list)
+		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;
+		}
+}
+
+static struct perf_pmu *pmu_find(const char *name)
+{
+	struct perf_pmu *pmu;
+
+	list_for_each_entry(pmu, &pmus, list)
+		if (!strcmp(pmu->name, name))
+			return pmu;
+
+	return NULL;
+}
+
+struct perf_pmu *perf_pmu__find_by_type(unsigned int type)
+{
+	struct perf_pmu *pmu;
+
+	list_for_each_entry(pmu, &pmus, list)
+		if (pmu->type == type)
+			return pmu;
+
+	return NULL;
+}
+
+struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
+{
+	/*
+	 * pmu iterator: If pmu is NULL, we start at the begin,
+	 * otherwise return the next pmu. Returns NULL on end.
+	 */
+	if (!pmu) {
+		pmu_read_sysfs();
+		pmu = list_prepare_entry(pmu, &pmus, list);
+	}
+	list_for_each_entry_continue(pmu, &pmus, list)
+		return pmu;
+	return NULL;
+}
+
+struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
+{
+	struct perf_pmu *pmu = NULL;
+
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		if (pmu->type == evsel->core.attr.type)
+			break;
+	}
+
+	return pmu;
+}
+
+bool evsel__is_aux_event(struct evsel *evsel)
+{
+	struct perf_pmu *pmu = evsel__find_pmu(evsel);
+
+	return pmu && pmu->auxtrace;
+}
+
+struct perf_pmu *perf_pmu__find(const char *name)
+{
+	struct perf_pmu *pmu;
+
+	/*
+	 * Once PMU is loaded it stays in the list,
+	 * so we keep us from multiple reading/parsing
+	 * the pmu format definitions.
+	 */
+	pmu = pmu_find(name);
+	if (pmu)
+		return pmu;
+
+	return pmu_lookup(name);
+}
+
+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 list_head *formats, const char *name)
+{
+	struct perf_pmu_format *format = pmu_find_format(formats, 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 list_head *formats, const char *name)
+{
+	struct perf_pmu_format *format = pmu_find_format(formats, name);
+
+	if (!format)
+		return -1;
+
+	return format->value;
+}
+
+/*
+ * Sets value based on the format definition (format parameter)
+ * and unformated 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 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(const char *pmu_name,
+			   struct list_head *formats,
+			   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(formats, term->config);
+	if (!format) {
+		char *pmu_term = pmu_formats_string(formats);
+		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__handle_error(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;
+	}
+
+	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;
+	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__handle_error(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__handle_error(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__handle_error(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(const char *pmu_name, struct list_head *formats,
+			   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_name, formats, 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;
+
+	attr->type = pmu->type;
+	return perf_pmu__config_terms(pmu->name, &pmu->format, 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;
+	char *name;
+
+	if (parse_events__is_hardcoded_term(term))
+		return NULL;
+
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
+		if (term->val.num != 1)
+			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;
+	}
+
+	list_for_each_entry(alias, &pmu->aliases, list) {
+		if (!strcasecmp(alias->name, name))
+			return alias;
+	}
+	return NULL;
+}
+
+
+static int check_info_data(struct perf_pmu_alias *alias,
+			   struct perf_pmu_info *info)
+{
+	/*
+	 * 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]) ||
+	    (info->scale && alias->scale) ||
+	    (info->snapshot && alias->snapshot))
+		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_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;
+	info->metric_expr = NULL;
+	info->metric_name = NULL;
+
+	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)
+			return ret;
+
+		ret = check_info_data(alias, info);
+		if (ret)
+			return ret;
+
+		if (alias->per_pkg)
+			info->per_pkg = true;
+		info->metric_expr = alias->metric_expr;
+		info->metric_name = alias->metric_name;
+
+		list_del_init(&term->list);
+		parse_events_term__delete(term);
+	}
+
+	/*
+	 * if no unit or scale foundin 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;
+}
+
+int perf_pmu__new_format(struct list_head *list, char *name,
+			 int config, unsigned long *bits)
+{
+	struct perf_pmu_format *format;
+
+	format = zalloc(sizeof(*format));
+	if (!format)
+		return -ENOMEM;
+
+	format->name = strdup(name);
+	format->value = config;
+	memcpy(format->bits, bits, sizeof(format->bits));
+
+	list_add_tail(&format->list, list);
+	return 0;
+}
+
+void perf_pmu__set_format(unsigned long *bits, long from, long to)
+{
+	long b;
+
+	if (!to)
+		to = from;
+
+	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
+	for (b = from; b <= to; b++)
+		set_bit(b, bits);
+}
+
+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);
+		free(fmt->name);
+		free(fmt);
+	}
+}
+
+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, struct perf_pmu *pmu,
+			  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);
+	}
+
+	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;
+}
+
+static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
+			     struct perf_pmu_alias *alias)
+{
+	snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
+	return buf;
+}
+
+struct sevent {
+	char *name;
+	char *desc;
+	char *topic;
+	char *str;
+	char *pmu;
+	char *metric_expr;
+	char *metric_name;
+	int is_cpu;
+};
+
+static int cmp_sevent(const void *a, const void *b)
+{
+	const struct sevent *as = a;
+	const struct sevent *bs = b;
+
+	/* Put extra events last */
+	if (!!as->desc != !!bs->desc)
+		return !!as->desc - !!bs->desc;
+	if (as->topic && bs->topic) {
+		int n = strcmp(as->topic, bs->topic);
+
+		if (n)
+			return n;
+	}
+
+	/* Order CPU core events to be first */
+	if (as->is_cpu != bs->is_cpu)
+		return bs->is_cpu - as->is_cpu;
+
+	return strcmp(as->name, bs->name);
+}
+
+static void wordwrap(char *s, int start, int max, int corr)
+{
+	int column = start;
+	int n;
+
+	while (*s) {
+		int wlen = strcspn(s, " \t");
+
+		if (column + wlen >= max && column > start) {
+			printf("\n%*s", start, "");
+			column = start + corr;
+		}
+		n = printf("%s%.*s", column > start ? " " : "", wlen, s);
+		if (n <= 0)
+			break;
+		s += wlen;
+		column += n;
+		s = skip_spaces(s);
+	}
+}
+
+bool is_pmu_core(const char *name)
+{
+	return !strcmp(name, "cpu") || is_arm_pmu_core(name);
+}
+
+void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
+			bool long_desc, bool details_flag, bool deprecated)
+{
+	struct perf_pmu *pmu;
+	struct perf_pmu_alias *alias;
+	char buf[1024];
+	int printed = 0;
+	int len, j;
+	struct sevent *aliases;
+	int numdesc = 0;
+	int columns = pager_get_columns();
+	char *topic = NULL;
+
+	pmu = NULL;
+	len = 0;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		list_for_each_entry(alias, &pmu->aliases, list)
+			len++;
+		if (pmu->selectable)
+			len++;
+	}
+	aliases = zalloc(sizeof(struct sevent) * len);
+	if (!aliases)
+		goto out_enomem;
+	pmu = NULL;
+	j = 0;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		list_for_each_entry(alias, &pmu->aliases, list) {
+			char *name = alias->desc ? alias->name :
+				format_alias(buf, sizeof(buf), pmu, alias);
+			bool is_cpu = is_pmu_core(pmu->name);
+
+			if (alias->deprecated && !deprecated)
+				continue;
+
+			if (event_glob != NULL &&
+			    !(strglobmatch_nocase(name, event_glob) ||
+			      (!is_cpu && strglobmatch_nocase(alias->name,
+						       event_glob)) ||
+			      (alias->topic &&
+			       strglobmatch_nocase(alias->topic, event_glob))))
+				continue;
+
+			if (is_cpu && !name_only && !alias->desc)
+				name = format_alias_or(buf, sizeof(buf), pmu, alias);
+
+			aliases[j].name = name;
+			if (is_cpu && !name_only && !alias->desc)
+				aliases[j].name = format_alias_or(buf,
+								  sizeof(buf),
+								  pmu, alias);
+			aliases[j].name = strdup(aliases[j].name);
+			if (!aliases[j].name)
+				goto out_enomem;
+
+			aliases[j].desc = long_desc ? alias->long_desc :
+						alias->desc;
+			aliases[j].topic = alias->topic;
+			aliases[j].str = alias->str;
+			aliases[j].pmu = pmu->name;
+			aliases[j].metric_expr = alias->metric_expr;
+			aliases[j].metric_name = alias->metric_name;
+			aliases[j].is_cpu = is_cpu;
+			j++;
+		}
+		if (pmu->selectable &&
+		    (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
+			char *s;
+			if (asprintf(&s, "%s//", pmu->name) < 0)
+				goto out_enomem;
+			aliases[j].name = s;
+			j++;
+		}
+	}
+	len = j;
+	qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
+	for (j = 0; j < len; j++) {
+		/* Skip duplicates */
+		if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
+			continue;
+		if (name_only) {
+			printf("%s ", aliases[j].name);
+			continue;
+		}
+		if (aliases[j].desc && !quiet_flag) {
+			if (numdesc++ == 0)
+				printf("\n");
+			if (aliases[j].topic && (!topic ||
+					strcmp(topic, aliases[j].topic))) {
+				printf("%s%s:\n", topic ? "\n" : "",
+						aliases[j].topic);
+				topic = aliases[j].topic;
+			}
+			printf("  %-50s\n", aliases[j].name);
+			printf("%*s", 8, "[");
+			wordwrap(aliases[j].desc, 8, columns, 0);
+			printf("]\n");
+			if (details_flag) {
+				printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
+				if (aliases[j].metric_name)
+					printf(" MetricName: %s", aliases[j].metric_name);
+				if (aliases[j].metric_expr)
+					printf(" MetricExpr: %s", aliases[j].metric_expr);
+				putchar('\n');
+			}
+		} else
+			printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
+		printed++;
+	}
+	if (printed && pager_in_use())
+		printf("\n");
+out_free:
+	for (j = 0; j < len; j++)
+		zfree(&aliases[j].name);
+	zfree(&aliases);
+	return;
+
+out_enomem:
+	printf("FATAL: not enough memory to print PMU events\n");
+	if (aliases)
+		goto out_free;
+}
+
+bool pmu_have_event(const char *pname, const char *name)
+{
+	struct perf_pmu *pmu;
+	struct perf_pmu_alias *alias;
+
+	pmu = NULL;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		if (strcmp(pname, pmu->name))
+			continue;
+		list_for_each_entry(alias, &pmu->aliases, list)
+			if (!strcmp(alias->name, name))
+				return true;
+	}
+	return false;
+}
+
+static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
+{
+	char path[PATH_MAX];
+	const char *sysfs;
+
+	sysfs = sysfs__mountpoint();
+	if (!sysfs)
+		return NULL;
+
+	snprintf(path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
+	if (!file_available(path))
+		return NULL;
+	return fopen(path, "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;
+}
+
+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;
+}
+
+/*
+ * 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];
+	const char *sysfs = sysfs__mountpoint();
+	DIR *caps_dir;
+	struct dirent *evt_ent;
+	int nr_caps = 0;
+
+	if (!sysfs)
+		return -1;
+
+	snprintf(caps_path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/caps", sysfs, pmu->name);
+
+	if (stat(caps_path, &st) < 0)
+		return 0;	/* no error if caps does not exist */
+
+	caps_dir = opendir(caps_path);
+	if (!caps_dir)
+		return -EINVAL;
+
+	while ((evt_ent = readdir(caps_dir)) != NULL) {
+		char path[PATH_MAX + NAME_MAX + 1];
+		char *name = evt_ent->d_name;
+		char value[128];
+		FILE *file;
+
+		if (!strcmp(name, ".") || !strcmp(name, ".."))
+			continue;
+
+		snprintf(path, sizeof(path), "%s/%s", caps_path, name);
+
+		file = fopen(path, "r");
+		if (!file)
+			continue;
+
+		if (!fgets(value, sizeof(value), file) ||
+		    (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
+			fclose(file);
+			continue;
+		}
+
+		nr_caps++;
+		fclose(file);
+	}
+
+	closedir(caps_dir);
+
+	return nr_caps;
+}
+
+void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
+				   char *name)
+{
+	struct perf_pmu_format *format;
+	__u64 masks = 0, bits;
+	char buf[100];
+	unsigned int i;
+
+	list_for_each_entry(format, &pmu->format, list)	{
+		if (format->value != PERF_PMU_FORMAT_VALUE_CONFIG)
+			continue;
+
+		for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
+			masks |= 1ULL << i;
+	}
+
+	/*
+	 * Kernel doesn't export any valid format bits.
+	 */
+	if (masks == 0)
+		return;
+
+	bits = config & ~masks;
+	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 config "
+		   "'%llx' not supported by kernel)!\n",
+		   name ?: "N/A", buf, config);
+}