linux_dsm_epyc7002/tools/perf/util/parse-events.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/hw_breakpoint.h>
#include <linux/err.h>
#include <linux/zalloc.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/param.h>
#include "term.h"
#include "build-id.h"
#include "evlist.h"
#include "evsel.h"
#include <subcmd/pager.h>
#include <subcmd/parse-options.h>
#include "parse-events.h"
#include <subcmd/exec-cmd.h>
#include "string2.h"
#include "strlist.h"
#include "symbol.h"
#include "header.h"
#include "bpf-loader.h"
#include "debug.h"
#include <api/fs/tracing_path.h>
#include <perf/cpumap.h>
#include "parse-events-bison.h"
#define YY_EXTRA_TYPE int
#include "parse-events-flex.h"
#include "pmu.h"
#include "thread_map.h"
#include "probe-file.h"
#include "asm/bug.h"
#include "util/parse-branch-options.h"
#include "metricgroup.h"
#include "util/evsel_config.h"
#include "util/event.h"

#define MAX_NAME_LEN 100

#ifdef PARSER_DEBUG
extern int parse_events_debug;
#endif
int parse_events_parse(void *parse_state, void *scanner);
static int get_config_terms(struct list_head *head_config,
			    struct list_head *head_terms __maybe_unused);

static struct perf_pmu_event_symbol *perf_pmu_events_list;
/*
 * The variable indicates the number of supported pmu event symbols.
 * 0 means not initialized and ready to init
 * -1 means failed to init, don't try anymore
 * >0 is the number of supported pmu event symbols
 */
static int perf_pmu_events_list_num;

struct event_symbol event_symbols_hw[PERF_COUNT_HW_MAX] = {
	[PERF_COUNT_HW_CPU_CYCLES] = {
		.symbol = "cpu-cycles",
		.alias  = "cycles",
	},
	[PERF_COUNT_HW_INSTRUCTIONS] = {
		.symbol = "instructions",
		.alias  = "",
	},
	[PERF_COUNT_HW_CACHE_REFERENCES] = {
		.symbol = "cache-references",
		.alias  = "",
	},
	[PERF_COUNT_HW_CACHE_MISSES] = {
		.symbol = "cache-misses",
		.alias  = "",
	},
	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = {
		.symbol = "branch-instructions",
		.alias  = "branches",
	},
	[PERF_COUNT_HW_BRANCH_MISSES] = {
		.symbol = "branch-misses",
		.alias  = "",
	},
	[PERF_COUNT_HW_BUS_CYCLES] = {
		.symbol = "bus-cycles",
		.alias  = "",
	},
	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = {
		.symbol = "stalled-cycles-frontend",
		.alias  = "idle-cycles-frontend",
	},
	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = {
		.symbol = "stalled-cycles-backend",
		.alias  = "idle-cycles-backend",
	},
	[PERF_COUNT_HW_REF_CPU_CYCLES] = {
		.symbol = "ref-cycles",
		.alias  = "",
	},
};

struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
	[PERF_COUNT_SW_CPU_CLOCK] = {
		.symbol = "cpu-clock",
		.alias  = "",
	},
	[PERF_COUNT_SW_TASK_CLOCK] = {
		.symbol = "task-clock",
		.alias  = "",
	},
	[PERF_COUNT_SW_PAGE_FAULTS] = {
		.symbol = "page-faults",
		.alias  = "faults",
	},
	[PERF_COUNT_SW_CONTEXT_SWITCHES] = {
		.symbol = "context-switches",
		.alias  = "cs",
	},
	[PERF_COUNT_SW_CPU_MIGRATIONS] = {
		.symbol = "cpu-migrations",
		.alias  = "migrations",
	},
	[PERF_COUNT_SW_PAGE_FAULTS_MIN] = {
		.symbol = "minor-faults",
		.alias  = "",
	},
	[PERF_COUNT_SW_PAGE_FAULTS_MAJ] = {
		.symbol = "major-faults",
		.alias  = "",
	},
	[PERF_COUNT_SW_ALIGNMENT_FAULTS] = {
		.symbol = "alignment-faults",
		.alias  = "",
	},
	[PERF_COUNT_SW_EMULATION_FAULTS] = {
		.symbol = "emulation-faults",
		.alias  = "",
	},
	[PERF_COUNT_SW_DUMMY] = {
		.symbol = "dummy",
		.alias  = "",
	},
	[PERF_COUNT_SW_BPF_OUTPUT] = {
		.symbol = "bpf-output",
		.alias  = "",
	},
};

#define __PERF_EVENT_FIELD(config, name) \
	((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)

#define PERF_EVENT_RAW(config)		__PERF_EVENT_FIELD(config, RAW)
#define PERF_EVENT_CONFIG(config)	__PERF_EVENT_FIELD(config, CONFIG)
#define PERF_EVENT_TYPE(config)		__PERF_EVENT_FIELD(config, TYPE)
#define PERF_EVENT_ID(config)		__PERF_EVENT_FIELD(config, EVENT)

#define for_each_subsystem(sys_dir, sys_dirent)			\
	while ((sys_dirent = readdir(sys_dir)) != NULL)		\
		if (sys_dirent->d_type == DT_DIR &&		\
		    (strcmp(sys_dirent->d_name, ".")) &&	\
		    (strcmp(sys_dirent->d_name, "..")))

static int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
{
	char evt_path[MAXPATHLEN];
	int fd;

	snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
	fd = open(evt_path, O_RDONLY);
	if (fd < 0)
		return -EINVAL;
	close(fd);

	return 0;
}

#define for_each_event(dir_path, evt_dir, evt_dirent)		\
	while ((evt_dirent = readdir(evt_dir)) != NULL)		\
		if (evt_dirent->d_type == DT_DIR &&		\
		    (strcmp(evt_dirent->d_name, ".")) &&	\
		    (strcmp(evt_dirent->d_name, "..")) &&	\
		    (!tp_event_has_id(dir_path, evt_dirent)))

#define MAX_EVENT_LENGTH 512

void parse_events__handle_error(struct parse_events_error *err, int idx,
				char *str, char *help)
{
	if (WARN(!str, "WARNING: failed to provide error string\n")) {
		free(help);
		return;
	}
	switch (err->num_errors) {
	case 0:
		err->idx = idx;
		err->str = str;
		err->help = help;
		break;
	case 1:
		err->first_idx = err->idx;
		err->idx = idx;
		err->first_str = err->str;
		err->str = str;
		err->first_help = err->help;
		err->help = help;
		break;
	default:
		WARN_ONCE(1, "WARNING: multiple event parsing errors\n");
		free(err->str);
		err->str = str;
		free(err->help);
		err->help = help;
		break;
	}
	err->num_errors++;
}

struct tracepoint_path *tracepoint_id_to_path(u64 config)
{
	struct tracepoint_path *path = NULL;
	DIR *sys_dir, *evt_dir;
	struct dirent *sys_dirent, *evt_dirent;
	char id_buf[24];
	int fd;
	u64 id;
	char evt_path[MAXPATHLEN];
	char *dir_path;

	sys_dir = tracing_events__opendir();
	if (!sys_dir)
		return NULL;

	for_each_subsystem(sys_dir, sys_dirent) {
		dir_path = get_events_file(sys_dirent->d_name);
		if (!dir_path)
			continue;
		evt_dir = opendir(dir_path);
		if (!evt_dir)
			goto next;

		for_each_event(dir_path, evt_dir, evt_dirent) {

			scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
				  evt_dirent->d_name);
			fd = open(evt_path, O_RDONLY);
			if (fd < 0)
				continue;
			if (read(fd, id_buf, sizeof(id_buf)) < 0) {
				close(fd);
				continue;
			}
			close(fd);
			id = atoll(id_buf);
			if (id == config) {
				put_events_file(dir_path);
				closedir(evt_dir);
				closedir(sys_dir);
				path = zalloc(sizeof(*path));
				if (!path)
					return NULL;
				path->system = malloc(MAX_EVENT_LENGTH);
				if (!path->system) {
					free(path);
					return NULL;
				}
				path->name = malloc(MAX_EVENT_LENGTH);
				if (!path->name) {
					zfree(&path->system);
					free(path);
					return NULL;
				}
				strncpy(path->system, sys_dirent->d_name,
					MAX_EVENT_LENGTH);
				strncpy(path->name, evt_dirent->d_name,
					MAX_EVENT_LENGTH);
				return path;
			}
		}
		closedir(evt_dir);
next:
		put_events_file(dir_path);
	}

	closedir(sys_dir);
	return NULL;
}

struct tracepoint_path *tracepoint_name_to_path(const char *name)
{
	struct tracepoint_path *path = zalloc(sizeof(*path));
	char *str = strchr(name, ':');

	if (path == NULL || str == NULL) {
		free(path);
		return NULL;
	}

	path->system = strndup(name, str - name);
	path->name = strdup(str+1);

	if (path->system == NULL || path->name == NULL) {
		zfree(&path->system);
		zfree(&path->name);
		zfree(&path);
	}

	return path;
}

const char *event_type(int type)
{
	switch (type) {
	case PERF_TYPE_HARDWARE:
		return "hardware";

	case PERF_TYPE_SOFTWARE:
		return "software";

	case PERF_TYPE_TRACEPOINT:
		return "tracepoint";

	case PERF_TYPE_HW_CACHE:
		return "hardware-cache";

	default:
		break;
	}

	return "unknown";
}

static int parse_events__is_name_term(struct parse_events_term *term)
{
	return term->type_term == PARSE_EVENTS__TERM_TYPE_NAME;
}

static char *get_config_name(struct list_head *head_terms)
{
	struct parse_events_term *term;

	if (!head_terms)
		return NULL;

	list_for_each_entry(term, head_terms, list)
		if (parse_events__is_name_term(term))
			return term->val.str;

	return NULL;
}

static struct evsel *
__add_event(struct list_head *list, int *idx,
	    struct perf_event_attr *attr,
	    char *name, struct perf_pmu *pmu,
	    struct list_head *config_terms, bool auto_merge_stats,
	    const char *cpu_list)
{
	struct evsel *evsel;
	struct perf_cpu_map *cpus = pmu ? pmu->cpus :
			       cpu_list ? perf_cpu_map__new(cpu_list) : NULL;

	event_attr_init(attr);

	evsel = perf_evsel__new_idx(attr, *idx);
	if (!evsel)
		return NULL;

	(*idx)++;
	evsel->core.cpus   = perf_cpu_map__get(cpus);
	evsel->core.own_cpus = perf_cpu_map__get(cpus);
	evsel->core.system_wide = pmu ? pmu->is_uncore : false;
	evsel->auto_merge_stats = auto_merge_stats;

	if (name)
		evsel->name = strdup(name);

	if (config_terms)
		list_splice(config_terms, &evsel->config_terms);

	list_add_tail(&evsel->core.node, list);
	return evsel;
}

static int add_event(struct list_head *list, int *idx,
		     struct perf_event_attr *attr, char *name,
		     struct list_head *config_terms)
{
	return __add_event(list, idx, attr, name, NULL, config_terms, false, NULL) ? 0 : -ENOMEM;
}

static int add_event_tool(struct list_head *list, int *idx,
			  enum perf_tool_event tool_event)
{
	struct evsel *evsel;
	struct perf_event_attr attr = {
		.type = PERF_TYPE_SOFTWARE,
		.config = PERF_COUNT_SW_DUMMY,
	};

	evsel = __add_event(list, idx, &attr, NULL, NULL, NULL, false, "0");
	if (!evsel)
		return -ENOMEM;
	evsel->tool_event = tool_event;
	if (tool_event == PERF_TOOL_DURATION_TIME)
		evsel->unit = strdup("ns");
	return 0;
}

static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
{
	int i, j;
	int n, longest = -1;

	for (i = 0; i < size; i++) {
		for (j = 0; j < PERF_EVSEL__MAX_ALIASES && names[i][j]; j++) {
			n = strlen(names[i][j]);
			if (n > longest && !strncasecmp(str, names[i][j], n))
				longest = n;
		}
		if (longest > 0)
			return i;
	}

	return -1;
}

typedef int config_term_func_t(struct perf_event_attr *attr,
			       struct parse_events_term *term,
			       struct parse_events_error *err);
static int config_term_common(struct perf_event_attr *attr,
			      struct parse_events_term *term,
			      struct parse_events_error *err);
static int config_attr(struct perf_event_attr *attr,
		       struct list_head *head,
		       struct parse_events_error *err,
		       config_term_func_t config_term);

int parse_events_add_cache(struct list_head *list, int *idx,
			   char *type, char *op_result1, char *op_result2,
			   struct parse_events_error *err,
			   struct list_head *head_config)
{
	struct perf_event_attr attr;
	LIST_HEAD(config_terms);
	char name[MAX_NAME_LEN], *config_name;
	int cache_type = -1, cache_op = -1, cache_result = -1;
	char *op_result[2] = { op_result1, op_result2 };
	int i, n;

	/*
	 * No fallback - if we cannot get a clear cache type
	 * then bail out:
	 */
	cache_type = parse_aliases(type, perf_evsel__hw_cache,
				   PERF_COUNT_HW_CACHE_MAX);
	if (cache_type == -1)
		return -EINVAL;

	config_name = get_config_name(head_config);
	n = snprintf(name, MAX_NAME_LEN, "%s", type);

	for (i = 0; (i < 2) && (op_result[i]); i++) {
		char *str = op_result[i];

		n += snprintf(name + n, MAX_NAME_LEN - n, "-%s", str);

		if (cache_op == -1) {
			cache_op = parse_aliases(str, perf_evsel__hw_cache_op,
						 PERF_COUNT_HW_CACHE_OP_MAX);
			if (cache_op >= 0) {
				if (!perf_evsel__is_cache_op_valid(cache_type, cache_op))
					return -EINVAL;
				continue;
			}
		}

		if (cache_result == -1) {
			cache_result = parse_aliases(str, perf_evsel__hw_cache_result,
						     PERF_COUNT_HW_CACHE_RESULT_MAX);
			if (cache_result >= 0)
				continue;
		}
	}

	/*
	 * Fall back to reads:
	 */
	if (cache_op == -1)
		cache_op = PERF_COUNT_HW_CACHE_OP_READ;

	/*
	 * Fall back to accesses:
	 */
	if (cache_result == -1)
		cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;

	memset(&attr, 0, sizeof(attr));
	attr.config = cache_type | (cache_op << 8) | (cache_result << 16);
	attr.type = PERF_TYPE_HW_CACHE;

	if (head_config) {
		if (config_attr(&attr, head_config, err,
				config_term_common))
			return -EINVAL;

		if (get_config_terms(head_config, &config_terms))
			return -ENOMEM;
	}
	return add_event(list, idx, &attr, config_name ? : name, &config_terms);
}

static void tracepoint_error(struct parse_events_error *e, int err,
			     const char *sys, const char *name)
{
	const char *str;
	char help[BUFSIZ];

	if (!e)
		return;

	/*
	 * We get error directly from syscall errno ( > 0),
	 * or from encoded pointer's error ( < 0).
	 */
	err = abs(err);

	switch (err) {
	case EACCES:
		str = "can't access trace events";
		break;
	case ENOENT:
		str = "unknown tracepoint";
		break;
	default:
		str = "failed to add tracepoint";
		break;
	}

	tracing_path__strerror_open_tp(err, help, sizeof(help), sys, name);
	parse_events__handle_error(e, 0, strdup(str), strdup(help));
}

static int add_tracepoint(struct list_head *list, int *idx,
			  const char *sys_name, const char *evt_name,
			  struct parse_events_error *err,
			  struct list_head *head_config)
{
	struct evsel *evsel;

	evsel = perf_evsel__newtp_idx(sys_name, evt_name, (*idx)++);
	if (IS_ERR(evsel)) {
		tracepoint_error(err, PTR_ERR(evsel), sys_name, evt_name);
		return PTR_ERR(evsel);
	}

	if (head_config) {
		LIST_HEAD(config_terms);

		if (get_config_terms(head_config, &config_terms))
			return -ENOMEM;
		list_splice(&config_terms, &evsel->config_terms);
	}

	list_add_tail(&evsel->core.node, list);
	return 0;
}

static int add_tracepoint_multi_event(struct list_head *list, int *idx,
				      const char *sys_name, const char *evt_name,
				      struct parse_events_error *err,
				      struct list_head *head_config)
{
	char *evt_path;
	struct dirent *evt_ent;
	DIR *evt_dir;
	int ret = 0, found = 0;

	evt_path = get_events_file(sys_name);
	if (!evt_path) {
		tracepoint_error(err, errno, sys_name, evt_name);
		return -1;
	}
	evt_dir = opendir(evt_path);
	if (!evt_dir) {
		put_events_file(evt_path);
		tracepoint_error(err, errno, sys_name, evt_name);
		return -1;
	}

	while (!ret && (evt_ent = readdir(evt_dir))) {
		if (!strcmp(evt_ent->d_name, ".")
		    || !strcmp(evt_ent->d_name, "..")
		    || !strcmp(evt_ent->d_name, "enable")
		    || !strcmp(evt_ent->d_name, "filter"))
			continue;

		if (!strglobmatch(evt_ent->d_name, evt_name))
			continue;

		found++;

		ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name,
				     err, head_config);
	}

	if (!found) {
		tracepoint_error(err, ENOENT, sys_name, evt_name);
		ret = -1;
	}

	put_events_file(evt_path);
	closedir(evt_dir);
	return ret;
}

static int add_tracepoint_event(struct list_head *list, int *idx,
				const char *sys_name, const char *evt_name,
				struct parse_events_error *err,
				struct list_head *head_config)
{
	return strpbrk(evt_name, "*?") ?
	       add_tracepoint_multi_event(list, idx, sys_name, evt_name,
					  err, head_config) :
	       add_tracepoint(list, idx, sys_name, evt_name,
			      err, head_config);
}

static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
				    const char *sys_name, const char *evt_name,
				    struct parse_events_error *err,
				    struct list_head *head_config)
{
	struct dirent *events_ent;
	DIR *events_dir;
	int ret = 0;

	events_dir = tracing_events__opendir();
	if (!events_dir) {
		tracepoint_error(err, errno, sys_name, evt_name);
		return -1;
	}

	while (!ret && (events_ent = readdir(events_dir))) {
		if (!strcmp(events_ent->d_name, ".")
		    || !strcmp(events_ent->d_name, "..")
		    || !strcmp(events_ent->d_name, "enable")
		    || !strcmp(events_ent->d_name, "header_event")
		    || !strcmp(events_ent->d_name, "header_page"))
			continue;

		if (!strglobmatch(events_ent->d_name, sys_name))
			continue;

		ret = add_tracepoint_event(list, idx, events_ent->d_name,
					   evt_name, err, head_config);
	}

	closedir(events_dir);
	return ret;
}

struct __add_bpf_event_param {
	struct parse_events_state *parse_state;
	struct list_head *list;
	struct list_head *head_config;
};

static int add_bpf_event(const char *group, const char *event, int fd, struct bpf_object *obj,
			 void *_param)
{
	LIST_HEAD(new_evsels);
	struct __add_bpf_event_param *param = _param;
	struct parse_events_state *parse_state = param->parse_state;
	struct list_head *list = param->list;
	struct evsel *pos;
	int err;
	/*
	 * Check if we should add the event, i.e. if it is a TP but starts with a '!',
	 * then don't add the tracepoint, this will be used for something else, like
	 * adding to a BPF_MAP_TYPE_PROG_ARRAY.
	 *
	 * See tools/perf/examples/bpf/augmented_raw_syscalls.c
	 */
	if (group[0] == '!')
		return 0;

	pr_debug("add bpf event %s:%s and attach bpf program %d\n",
		 group, event, fd);

	err = parse_events_add_tracepoint(&new_evsels, &parse_state->idx, group,
					  event, parse_state->error,
					  param->head_config);
	if (err) {
		struct evsel *evsel, *tmp;

		pr_debug("Failed to add BPF event %s:%s\n",
			 group, event);
		list_for_each_entry_safe(evsel, tmp, &new_evsels, core.node) {
			list_del_init(&evsel->core.node);
			evsel__delete(evsel);
		}
		return err;
	}
	pr_debug("adding %s:%s\n", group, event);

	list_for_each_entry(pos, &new_evsels, core.node) {
		pr_debug("adding %s:%s to %p\n",
			 group, event, pos);
		pos->bpf_fd = fd;
		pos->bpf_obj = obj;
	}
	list_splice(&new_evsels, list);
	return 0;
}

int parse_events_load_bpf_obj(struct parse_events_state *parse_state,
			      struct list_head *list,
			      struct bpf_object *obj,
			      struct list_head *head_config)
{
	int err;
	char errbuf[BUFSIZ];
	struct __add_bpf_event_param param = {parse_state, list, head_config};
	static bool registered_unprobe_atexit = false;

	if (IS_ERR(obj) || !obj) {
		snprintf(errbuf, sizeof(errbuf),
			 "Internal error: load bpf obj with NULL");
		err = -EINVAL;
		goto errout;
	}

	/*
	 * Register atexit handler before calling bpf__probe() so
	 * bpf__probe() don't need to unprobe probe points its already
	 * created when failure.
	 */
	if (!registered_unprobe_atexit) {
		atexit(bpf__clear);
		registered_unprobe_atexit = true;
	}

	err = bpf__probe(obj);
	if (err) {
		bpf__strerror_probe(obj, err, errbuf, sizeof(errbuf));
		goto errout;
	}

	err = bpf__load(obj);
	if (err) {
		bpf__strerror_load(obj, err, errbuf, sizeof(errbuf));
		goto errout;
	}

	err = bpf__foreach_event(obj, add_bpf_event, &param);
	if (err) {
		snprintf(errbuf, sizeof(errbuf),
			 "Attach events in BPF object failed");
		goto errout;
	}

	return 0;
errout:
	parse_state->error->help = strdup("(add -v to see detail)");
	parse_state->error->str = strdup(errbuf);
	return err;
}

static int
parse_events_config_bpf(struct parse_events_state *parse_state,
			struct bpf_object *obj,
			struct list_head *head_config)
{
	struct parse_events_term *term;
	int error_pos;

	if (!head_config || list_empty(head_config))
		return 0;

	list_for_each_entry(term, head_config, list) {
		char errbuf[BUFSIZ];
		int err;

		if (term->type_term != PARSE_EVENTS__TERM_TYPE_USER) {
			snprintf(errbuf, sizeof(errbuf),
				 "Invalid config term for BPF object");
			errbuf[BUFSIZ - 1] = '\0';

			parse_state->error->idx = term->err_term;
			parse_state->error->str = strdup(errbuf);
			return -EINVAL;
		}

		err = bpf__config_obj(obj, term, parse_state->evlist, &error_pos);
		if (err) {
			bpf__strerror_config_obj(obj, term, parse_state->evlist,
						 &error_pos, err, errbuf,
						 sizeof(errbuf));
			parse_state->error->help = strdup(
"Hint:\tValid config terms:\n"
"     \tmap:[<arraymap>].value<indices>=[value]\n"
"     \tmap:[<eventmap>].event<indices>=[event]\n"
"\n"
"     \twhere <indices> is something like [0,3...5] or [all]\n"
"     \t(add -v to see detail)");
			parse_state->error->str = strdup(errbuf);
			if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE)
				parse_state->error->idx = term->err_val;
			else
				parse_state->error->idx = term->err_term + error_pos;
			return err;
		}
	}
	return 0;
}

/*
 * Split config terms:
 * perf record -e bpf.c/call-graph=fp,map:array.value[0]=1/ ...
 *  'call-graph=fp' is 'evt config', should be applied to each
 *  events in bpf.c.
 * 'map:array.value[0]=1' is 'obj config', should be processed
 * with parse_events_config_bpf.
 *
 * Move object config terms from the first list to obj_head_config.
 */
static void
split_bpf_config_terms(struct list_head *evt_head_config,
		       struct list_head *obj_head_config)
{
	struct parse_events_term *term, *temp;

	/*
	 * Currectly, all possible user config term
	 * belong to bpf object. parse_events__is_hardcoded_term()
	 * happends to be a good flag.
	 *
	 * See parse_events_config_bpf() and
	 * config_term_tracepoint().
	 */
	list_for_each_entry_safe(term, temp, evt_head_config, list)
		if (!parse_events__is_hardcoded_term(term))
			list_move_tail(&term->list, obj_head_config);
}

int parse_events_load_bpf(struct parse_events_state *parse_state,
			  struct list_head *list,
			  char *bpf_file_name,
			  bool source,
			  struct list_head *head_config)
{
	int err;
	struct bpf_object *obj;
	LIST_HEAD(obj_head_config);

	if (head_config)
		split_bpf_config_terms(head_config, &obj_head_config);

	obj = bpf__prepare_load(bpf_file_name, source);
	if (IS_ERR(obj)) {
		char errbuf[BUFSIZ];

		err = PTR_ERR(obj);

		if (err == -ENOTSUP)
			snprintf(errbuf, sizeof(errbuf),
				 "BPF support is not compiled");
		else
			bpf__strerror_prepare_load(bpf_file_name,
						   source,
						   -err, errbuf,
						   sizeof(errbuf));

		parse_state->error->help = strdup("(add -v to see detail)");
		parse_state->error->str = strdup(errbuf);
		return err;
	}

	err = parse_events_load_bpf_obj(parse_state, list, obj, head_config);
	if (err)
		return err;
	err = parse_events_config_bpf(parse_state, obj, &obj_head_config);

	/*
	 * Caller doesn't know anything about obj_head_config,
	 * so combine them together again before returnning.
	 */
	if (head_config)
		list_splice_tail(&obj_head_config, head_config);
	return err;
}

static int
parse_breakpoint_type(const char *type, struct perf_event_attr *attr)
{
	int i;

	for (i = 0; i < 3; i++) {
		if (!type || !type[i])
			break;

#define CHECK_SET_TYPE(bit)		\
do {					\
	if (attr->bp_type & bit)	\
		return -EINVAL;		\
	else				\
		attr->bp_type |= bit;	\
} while (0)

		switch (type[i]) {
		case 'r':
			CHECK_SET_TYPE(HW_BREAKPOINT_R);
			break;
		case 'w':
			CHECK_SET_TYPE(HW_BREAKPOINT_W);
			break;
		case 'x':
			CHECK_SET_TYPE(HW_BREAKPOINT_X);
			break;
		default:
			return -EINVAL;
		}
	}

#undef CHECK_SET_TYPE

	if (!attr->bp_type) /* Default */
		attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;

	return 0;
}

int parse_events_add_breakpoint(struct list_head *list, int *idx,
				void *ptr, char *type, u64 len)
{
	struct perf_event_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.bp_addr = (unsigned long) ptr;

	if (parse_breakpoint_type(type, &attr))
		return -EINVAL;

	/* Provide some defaults if len is not specified */
	if (!len) {
		if (attr.bp_type == HW_BREAKPOINT_X)
			len = sizeof(long);
		else
			len = HW_BREAKPOINT_LEN_4;
	}

	attr.bp_len = len;

	attr.type = PERF_TYPE_BREAKPOINT;
	attr.sample_period = 1;

	return add_event(list, idx, &attr, NULL, NULL);
}

static int check_type_val(struct parse_events_term *term,
			  struct parse_events_error *err,
			  int type)
{
	if (type == term->type_val)
		return 0;

	if (err) {
		parse_events__handle_error(err, term->err_val,
					type == PARSE_EVENTS__TERM_TYPE_NUM
					? strdup("expected numeric value")
					: strdup("expected string value"),
					NULL);
	}
	return -EINVAL;
}

/*
 * Update according to parse-events.l
 */
static const char *config_term_names[__PARSE_EVENTS__TERM_TYPE_NR] = {
	[PARSE_EVENTS__TERM_TYPE_USER]			= "<sysfs term>",
	[PARSE_EVENTS__TERM_TYPE_CONFIG]		= "config",
	[PARSE_EVENTS__TERM_TYPE_CONFIG1]		= "config1",
	[PARSE_EVENTS__TERM_TYPE_CONFIG2]		= "config2",
	[PARSE_EVENTS__TERM_TYPE_NAME]			= "name",
	[PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD]		= "period",
	[PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ]		= "freq",
	[PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE]	= "branch_type",
	[PARSE_EVENTS__TERM_TYPE_TIME]			= "time",
	[PARSE_EVENTS__TERM_TYPE_CALLGRAPH]		= "call-graph",
	[PARSE_EVENTS__TERM_TYPE_STACKSIZE]		= "stack-size",
	[PARSE_EVENTS__TERM_TYPE_NOINHERIT]		= "no-inherit",
	[PARSE_EVENTS__TERM_TYPE_INHERIT]		= "inherit",
	[PARSE_EVENTS__TERM_TYPE_MAX_STACK]		= "max-stack",
	[PARSE_EVENTS__TERM_TYPE_MAX_EVENTS]		= "nr",
	[PARSE_EVENTS__TERM_TYPE_OVERWRITE]		= "overwrite",
	[PARSE_EVENTS__TERM_TYPE_NOOVERWRITE]		= "no-overwrite",
	[PARSE_EVENTS__TERM_TYPE_DRV_CFG]		= "driver-config",
	[PARSE_EVENTS__TERM_TYPE_PERCORE]		= "percore",
	[PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT]		= "aux-output",
	[PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE]	= "aux-sample-size",
};

static bool config_term_shrinked;

static bool
config_term_avail(int term_type, struct parse_events_error *err)
{
	char *err_str;

	if (term_type < 0 || term_type >= __PARSE_EVENTS__TERM_TYPE_NR) {
		parse_events__handle_error(err, -1,
					strdup("Invalid term_type"), NULL);
		return false;
	}
	if (!config_term_shrinked)
		return true;

	switch (term_type) {
	case PARSE_EVENTS__TERM_TYPE_CONFIG:
	case PARSE_EVENTS__TERM_TYPE_CONFIG1:
	case PARSE_EVENTS__TERM_TYPE_CONFIG2:
	case PARSE_EVENTS__TERM_TYPE_NAME:
	case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
	case PARSE_EVENTS__TERM_TYPE_PERCORE:
		return true;
	default:
		if (!err)
			return false;

		/* term_type is validated so indexing is safe */
		if (asprintf(&err_str, "'%s' is not usable in 'perf stat'",
				config_term_names[term_type]) >= 0)
			parse_events__handle_error(err, -1, err_str, NULL);
		return false;
	}
}

void parse_events__shrink_config_terms(void)
{
	config_term_shrinked = true;
}

static int config_term_common(struct perf_event_attr *attr,
			      struct parse_events_term *term,
			      struct parse_events_error *err)
{
#define CHECK_TYPE_VAL(type)						   \
do {									   \
	if (check_type_val(term, err, PARSE_EVENTS__TERM_TYPE_ ## type)) \
		return -EINVAL;						   \
} while (0)

	switch (term->type_term) {
	case PARSE_EVENTS__TERM_TYPE_CONFIG:
		CHECK_TYPE_VAL(NUM);
		attr->config = term->val.num;
		break;
	case PARSE_EVENTS__TERM_TYPE_CONFIG1:
		CHECK_TYPE_VAL(NUM);
		attr->config1 = term->val.num;
		break;
	case PARSE_EVENTS__TERM_TYPE_CONFIG2:
		CHECK_TYPE_VAL(NUM);
		attr->config2 = term->val.num;
		break;
	case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
		CHECK_TYPE_VAL(STR);
		if (strcmp(term->val.str, "no") &&
		    parse_branch_str(term->val.str,
				    &attr->branch_sample_type)) {
			parse_events__handle_error(err, term->err_val,
					strdup("invalid branch sample type"),
					NULL);
			return -EINVAL;
		}
		break;
	case PARSE_EVENTS__TERM_TYPE_TIME:
		CHECK_TYPE_VAL(NUM);
		if (term->val.num > 1) {
			parse_events__handle_error(err, term->err_val,
						strdup("expected 0 or 1"),
						NULL);
			return -EINVAL;
		}
		break;
	case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
		CHECK_TYPE_VAL(STR);
		break;
	case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_INHERIT:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_NAME:
		CHECK_TYPE_VAL(STR);
		break;
	case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_PERCORE:
		CHECK_TYPE_VAL(NUM);
		if ((unsigned int)term->val.num > 1) {
			parse_events__handle_error(err, term->err_val,
						strdup("expected 0 or 1"),
						NULL);
			return -EINVAL;
		}
		break;
	case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
		CHECK_TYPE_VAL(NUM);
		break;
	case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
		CHECK_TYPE_VAL(NUM);
		if (term->val.num > UINT_MAX) {
			parse_events__handle_error(err, term->err_val,
						strdup("too big"),
						NULL);
			return -EINVAL;
		}
		break;
	default:
		parse_events__handle_error(err, term->err_term,
				strdup("unknown term"),
				parse_events_formats_error_string(NULL));
		return -EINVAL;
	}

	/*
	 * Check term availbility after basic checking so
	 * PARSE_EVENTS__TERM_TYPE_USER can be found and filtered.
	 *
	 * If check availbility at the entry of this function,
	 * user will see "'<sysfs term>' is not usable in 'perf stat'"
	 * if an invalid config term is provided for legacy events
	 * (for example, instructions/badterm/...), which is confusing.
	 */
	if (!config_term_avail(term->type_term, err))
		return -EINVAL;
	return 0;
#undef CHECK_TYPE_VAL
}

static int config_term_pmu(struct perf_event_attr *attr,
			   struct parse_events_term *term,
			   struct parse_events_error *err)
{
	if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER ||
	    term->type_term == PARSE_EVENTS__TERM_TYPE_DRV_CFG)
		/*
		 * Always succeed for sysfs terms, as we dont know
		 * at this point what type they need to have.
		 */
		return 0;
	else
		return config_term_common(attr, term, err);
}

static int config_term_tracepoint(struct perf_event_attr *attr,
				  struct parse_events_term *term,
				  struct parse_events_error *err)
{
	switch (term->type_term) {
	case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
	case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
	case PARSE_EVENTS__TERM_TYPE_INHERIT:
	case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
	case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
	case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
	case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
	case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
	case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
	case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
		return config_term_common(attr, term, err);
	default:
		if (err) {
			parse_events__handle_error(err, term->err_term,
				strdup("unknown term"),
				strdup("valid terms: call-graph,stack-size\n"));
		}
		return -EINVAL;
	}

	return 0;
}

static int config_attr(struct perf_event_attr *attr,
		       struct list_head *head,
		       struct parse_events_error *err,
		       config_term_func_t config_term)
{
	struct parse_events_term *term;

	list_for_each_entry(term, head, list)
		if (config_term(attr, term, err))
			return -EINVAL;

	return 0;
}

static int get_config_terms(struct list_head *head_config,
			    struct list_head *head_terms __maybe_unused)
{
#define ADD_CONFIG_TERM(__type, __name, __val)			\
do {								\
	struct perf_evsel_config_term *__t;			\
								\
	__t = zalloc(sizeof(*__t));				\
	if (!__t)						\
		return -ENOMEM;					\
								\
	INIT_LIST_HEAD(&__t->list);				\
	__t->type       = PERF_EVSEL__CONFIG_TERM_ ## __type;	\
	__t->val.__name = __val;				\
	__t->weak	= term->weak;				\
	list_add_tail(&__t->list, head_terms);			\
} while (0)

	struct parse_events_term *term;

	list_for_each_entry(term, head_config, list) {
		switch (term->type_term) {
		case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
			ADD_CONFIG_TERM(PERIOD, period, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
			ADD_CONFIG_TERM(FREQ, freq, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_TIME:
			ADD_CONFIG_TERM(TIME, time, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
			ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
			break;
		case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
			ADD_CONFIG_TERM(BRANCH, branch, term->val.str);
			break;
		case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
			ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_INHERIT:
			ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
			break;
		case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
			ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
			break;
		case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
			ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
			ADD_CONFIG_TERM(MAX_EVENTS, max_events, term->val.num);
			break;
		case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
			break;
		case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
			ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
			break;
		case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
			ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
			break;
		case PARSE_EVENTS__TERM_TYPE_PERCORE:
			ADD_CONFIG_TERM(PERCORE, percore,
					term->val.num ? true : false);
			break;
		case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
			ADD_CONFIG_TERM(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
			break;
		case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
			ADD_CONFIG_TERM(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
			break;
		default:
			break;
		}
	}
	return 0;
}

/*
 * Add PERF_EVSEL__CONFIG_TERM_CFG_CHG where cfg_chg will have a bit set for
 * each bit of attr->config that the user has changed.
 */
static int get_config_chgs(struct perf_pmu *pmu, struct list_head *head_config,
			   struct list_head *head_terms)
{
	struct parse_events_term *term;
	u64 bits = 0;
	int type;

	list_for_each_entry(term, head_config, list) {
		switch (term->type_term) {
		case PARSE_EVENTS__TERM_TYPE_USER:
			type = perf_pmu__format_type(&pmu->format, term->config);
			if (type != PERF_PMU_FORMAT_VALUE_CONFIG)
				continue;
			bits |= perf_pmu__format_bits(&pmu->format, term->config);
			break;
		case PARSE_EVENTS__TERM_TYPE_CONFIG:
			bits = ~(u64)0;
			break;
		default:
			break;
		}
	}

	if (bits)
		ADD_CONFIG_TERM(CFG_CHG, cfg_chg, bits);

#undef ADD_CONFIG_TERM
	return 0;
}

int parse_events_add_tracepoint(struct list_head *list, int *idx,
				const char *sys, const char *event,
				struct parse_events_error *err,
				struct list_head *head_config)
{
	if (head_config) {
		struct perf_event_attr attr;

		if (config_attr(&attr, head_config, err,
				config_term_tracepoint))
			return -EINVAL;
	}

	if (strpbrk(sys, "*?"))
		return add_tracepoint_multi_sys(list, idx, sys, event,
						err, head_config);
	else
		return add_tracepoint_event(list, idx, sys, event,
					    err, head_config);
}

int parse_events_add_numeric(struct parse_events_state *parse_state,
			     struct list_head *list,
			     u32 type, u64 config,
			     struct list_head *head_config)
{
	struct perf_event_attr attr;
	LIST_HEAD(config_terms);

	memset(&attr, 0, sizeof(attr));
	attr.type = type;
	attr.config = config;

	if (head_config) {
		if (config_attr(&attr, head_config, parse_state->error,
				config_term_common))
			return -EINVAL;

		if (get_config_terms(head_config, &config_terms))
			return -ENOMEM;
	}

	return add_event(list, &parse_state->idx, &attr,
			 get_config_name(head_config), &config_terms);
}

int parse_events_add_tool(struct parse_events_state *parse_state,
			  struct list_head *list,
			  enum perf_tool_event tool_event)
{
	return add_event_tool(list, &parse_state->idx, tool_event);
}

static bool config_term_percore(struct list_head *config_terms)
{
	struct perf_evsel_config_term *term;

	list_for_each_entry(term, config_terms, list) {
		if (term->type == PERF_EVSEL__CONFIG_TERM_PERCORE)
			return term->val.percore;
	}

	return false;
}

int parse_events_add_pmu(struct parse_events_state *parse_state,
			 struct list_head *list, char *name,
			 struct list_head *head_config,
			 bool auto_merge_stats,
			 bool use_alias)
{
	struct perf_event_attr attr;
	struct perf_pmu_info info;
	struct perf_pmu *pmu;
	struct evsel *evsel;
	struct parse_events_error *err = parse_state->error;
	bool use_uncore_alias;
	LIST_HEAD(config_terms);

	pmu = perf_pmu__find(name);
	if (!pmu) {
		char *err_str;

		if (asprintf(&err_str,
				"Cannot find PMU `%s'. Missing kernel support?",
				name) >= 0)
			parse_events__handle_error(err, 0, err_str, NULL);
		return -EINVAL;
	}

	if (pmu->default_config) {
		memcpy(&attr, pmu->default_config,
		       sizeof(struct perf_event_attr));
	} else {
		memset(&attr, 0, sizeof(attr));
	}

	use_uncore_alias = (pmu->is_uncore && use_alias);

	if (!head_config) {
		attr.type = pmu->type;
		evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu, NULL,
				    auto_merge_stats, NULL);
		if (evsel) {
			evsel->pmu_name = name;
			evsel->use_uncore_alias = use_uncore_alias;
			return 0;
		} else {
			return -ENOMEM;
		}
	}

	if (perf_pmu__check_alias(pmu, head_config, &info))
		return -EINVAL;

	/*
	 * Configure hardcoded terms first, no need to check
	 * return value when called with fail == 0 ;)
	 */
	if (config_attr(&attr, head_config, parse_state->error, config_term_pmu))
		return -EINVAL;

	if (get_config_terms(head_config, &config_terms))
		return -ENOMEM;

	/*
	 * When using default config, record which bits of attr->config were
	 * changed by the user.
	 */
	if (pmu->default_config && get_config_chgs(pmu, head_config, &config_terms))
		return -ENOMEM;

	if (perf_pmu__config(pmu, &attr, head_config, parse_state->error)) {
		struct perf_evsel_config_term *pos, *tmp;

		list_for_each_entry_safe(pos, tmp, &config_terms, list) {
			list_del_init(&pos->list);
			free(pos);
		}
		return -EINVAL;
	}

	evsel = __add_event(list, &parse_state->idx, &attr,
			    get_config_name(head_config), pmu,
			    &config_terms, auto_merge_stats, NULL);
	if (evsel) {
		evsel->unit = info.unit;
		evsel->scale = info.scale;
		evsel->per_pkg = info.per_pkg;
		evsel->snapshot = info.snapshot;
		evsel->metric_expr = info.metric_expr;
		evsel->metric_name = info.metric_name;
		evsel->pmu_name = name;
		evsel->use_uncore_alias = use_uncore_alias;
		evsel->percore = config_term_percore(&evsel->config_terms);
	}

	return evsel ? 0 : -ENOMEM;
}

int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
			       char *str, struct list_head **listp)
{
	struct parse_events_term *term;
	struct list_head *list;
	struct perf_pmu *pmu = NULL;
	int ok = 0;

	*listp = NULL;
	/* Add it for all PMUs that support the alias */
	list = malloc(sizeof(struct list_head));
	if (!list)
		return -1;
	INIT_LIST_HEAD(list);
	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
		struct perf_pmu_alias *alias;

		list_for_each_entry(alias, &pmu->aliases, list) {
			if (!strcasecmp(alias->name, str)) {
				struct list_head *head;
				char *config;

				head = malloc(sizeof(struct list_head));
				if (!head)
					return -1;
				INIT_LIST_HEAD(head);
				config = strdup(str);
				if (!config)
					return -1;
				if (parse_events_term__num(&term,
						   PARSE_EVENTS__TERM_TYPE_USER,
						   config, 1, false, &config,
						   NULL) < 0) {
					free(list);
					free(config);
					return -1;
				}
				list_add_tail(&term->list, head);

				if (!parse_events_add_pmu(parse_state, list,
							  pmu->name, head,
							  true, true)) {
					pr_debug("%s -> %s/%s/\n", config,
						 pmu->name, alias->str);
					ok++;
				}

				parse_events_terms__delete(head);
			}
		}
	}
	if (!ok) {
		free(list);
		return -1;
	}
	*listp = list;
	return 0;
}

int parse_events__modifier_group(struct list_head *list,
				 char *event_mod)
{
	return parse_events__modifier_event(list, event_mod, true);
}

/*
 * Check if the two uncore PMUs are from the same uncore block
 * The format of the uncore PMU name is uncore_#blockname_#pmuidx
 */
static bool is_same_uncore_block(const char *pmu_name_a, const char *pmu_name_b)
{
	char *end_a, *end_b;

	end_a = strrchr(pmu_name_a, '_');
	end_b = strrchr(pmu_name_b, '_');

	if (!end_a || !end_b)
		return false;

	if ((end_a - pmu_name_a) != (end_b - pmu_name_b))
		return false;

	return (strncmp(pmu_name_a, pmu_name_b, end_a - pmu_name_a) == 0);
}

static int
parse_events__set_leader_for_uncore_aliase(char *name, struct list_head *list,
					   struct parse_events_state *parse_state)
{
	struct evsel *evsel, *leader;
	uintptr_t *leaders;
	bool is_leader = true;
	int i, nr_pmu = 0, total_members, ret = 0;

	leader = list_first_entry(list, struct evsel, core.node);
	evsel = list_last_entry(list, struct evsel, core.node);
	total_members = evsel->idx - leader->idx + 1;

	leaders = calloc(total_members, sizeof(uintptr_t));
	if (WARN_ON(!leaders))
		return 0;

	/*
	 * Going through the whole group and doing sanity check.
	 * All members must use alias, and be from the same uncore block.
	 * Also, storing the leader events in an array.
	 */
	__evlist__for_each_entry(list, evsel) {

		/* Only split the uncore group which members use alias */
		if (!evsel->use_uncore_alias)
			goto out;

		/* The events must be from the same uncore block */
		if (!is_same_uncore_block(leader->pmu_name, evsel->pmu_name))
			goto out;

		if (!is_leader)
			continue;
		/*
		 * If the event's PMU name starts to repeat, it must be a new
		 * event. That can be used to distinguish the leader from
		 * other members, even they have the same event name.
		 */
		if ((leader != evsel) && (leader->pmu_name == evsel->pmu_name)) {
			is_leader = false;
			continue;
		}
		/* The name is always alias name */
		WARN_ON(strcmp(leader->name, evsel->name));

		/* Store the leader event for each PMU */
		leaders[nr_pmu++] = (uintptr_t) evsel;
	}

	/* only one event alias */
	if (nr_pmu == total_members) {
		parse_state->nr_groups--;
		goto handled;
	}

	/*
	 * An uncore event alias is a joint name which means the same event
	 * runs on all PMUs of a block.
	 * Perf doesn't support mixed events from different PMUs in the same
	 * group. The big group has to be split into multiple small groups
	 * which only include the events from the same PMU.
	 *
	 * Here the uncore event aliases must be from the same uncore block.
	 * The number of PMUs must be same for each alias. The number of new
	 * small groups equals to the number of PMUs.
	 * Setting the leader event for corresponding members in each group.
	 */
	i = 0;
	__evlist__for_each_entry(list, evsel) {
		if (i >= nr_pmu)
			i = 0;
		evsel->leader = (struct evsel *) leaders[i++];
	}

	/* The number of members and group name are same for each group */
	for (i = 0; i < nr_pmu; i++) {
		evsel = (struct evsel *) leaders[i];
		evsel->core.nr_members = total_members / nr_pmu;
		evsel->group_name = name ? strdup(name) : NULL;
	}

	/* Take the new small groups into account */
	parse_state->nr_groups += nr_pmu - 1;

handled:
	ret = 1;
out:
	free(leaders);
	return ret;
}

void parse_events__set_leader(char *name, struct list_head *list,
			      struct parse_events_state *parse_state)
{
	struct evsel *leader;

	if (list_empty(list)) {
		WARN_ONCE(true, "WARNING: failed to set leader: empty list");
		return;
	}

	if (parse_events__set_leader_for_uncore_aliase(name, list, parse_state))
		return;

	__perf_evlist__set_leader(list);
	leader = list_entry(list->next, struct evsel, core.node);
	leader->group_name = name ? strdup(name) : NULL;
}

/* list_event is assumed to point to malloc'ed memory */
void parse_events_update_lists(struct list_head *list_event,
			       struct list_head *list_all)
{
	/*
	 * Called for single event definition. Update the
	 * 'all event' list, and reinit the 'single event'
	 * list, for next event definition.
	 */
	list_splice_tail(list_event, list_all);
	free(list_event);
}

struct event_modifier {
	int eu;
	int ek;
	int eh;
	int eH;
	int eG;
	int eI;
	int precise;
	int precise_max;
	int exclude_GH;
	int sample_read;
	int pinned;
	int weak;
};

static int get_event_modifier(struct event_modifier *mod, char *str,
			       struct evsel *evsel)
{
	int eu = evsel ? evsel->core.attr.exclude_user : 0;
	int ek = evsel ? evsel->core.attr.exclude_kernel : 0;
	int eh = evsel ? evsel->core.attr.exclude_hv : 0;
	int eH = evsel ? evsel->core.attr.exclude_host : 0;
	int eG = evsel ? evsel->core.attr.exclude_guest : 0;
	int eI = evsel ? evsel->core.attr.exclude_idle : 0;
	int precise = evsel ? evsel->core.attr.precise_ip : 0;
	int precise_max = 0;
	int sample_read = 0;
	int pinned = evsel ? evsel->core.attr.pinned : 0;

	int exclude = eu | ek | eh;
	int exclude_GH = evsel ? evsel->exclude_GH : 0;
	int weak = 0;

	memset(mod, 0, sizeof(*mod));

	while (*str) {
		if (*str == 'u') {
			if (!exclude)
				exclude = eu = ek = eh = 1;
			eu = 0;
		} else if (*str == 'k') {
			if (!exclude)
				exclude = eu = ek = eh = 1;
			ek = 0;
		} else if (*str == 'h') {
			if (!exclude)
				exclude = eu = ek = eh = 1;
			eh = 0;
		} else if (*str == 'G') {
			if (!exclude_GH)
				exclude_GH = eG = eH = 1;
			eG = 0;
		} else if (*str == 'H') {
			if (!exclude_GH)
				exclude_GH = eG = eH = 1;
			eH = 0;
		} else if (*str == 'I') {
			eI = 1;
		} else if (*str == 'p') {
			precise++;
			/* use of precise requires exclude_guest */
			if (!exclude_GH)
				eG = 1;
		} else if (*str == 'P') {
			precise_max = 1;
		} else if (*str == 'S') {
			sample_read = 1;
		} else if (*str == 'D') {
			pinned = 1;
		} else if (*str == 'W') {
			weak = 1;
		} else
			break;

		++str;
	}

	/*
	 * precise ip:
	 *
	 *  0 - SAMPLE_IP can have arbitrary skid
	 *  1 - SAMPLE_IP must have constant skid
	 *  2 - SAMPLE_IP requested to have 0 skid
	 *  3 - SAMPLE_IP must have 0 skid
	 *
	 *  See also PERF_RECORD_MISC_EXACT_IP
	 */
	if (precise > 3)
		return -EINVAL;

	mod->eu = eu;
	mod->ek = ek;
	mod->eh = eh;
	mod->eH = eH;
	mod->eG = eG;
	mod->eI = eI;
	mod->precise = precise;
	mod->precise_max = precise_max;
	mod->exclude_GH = exclude_GH;
	mod->sample_read = sample_read;
	mod->pinned = pinned;
	mod->weak = weak;

	return 0;
}

/*
 * Basic modifier sanity check to validate it contains only one
 * instance of any modifier (apart from 'p') present.
 */
static int check_modifier(char *str)
{
	char *p = str;

	/* The sizeof includes 0 byte as well. */
	if (strlen(str) > (sizeof("ukhGHpppPSDIW") - 1))
		return -1;

	while (*p) {
		if (*p != 'p' && strchr(p + 1, *p))
			return -1;
		p++;
	}

	return 0;
}

int parse_events__modifier_event(struct list_head *list, char *str, bool add)
{
	struct evsel *evsel;
	struct event_modifier mod;

	if (str == NULL)
		return 0;

	if (check_modifier(str))
		return -EINVAL;

	if (!add && get_event_modifier(&mod, str, NULL))
		return -EINVAL;

	__evlist__for_each_entry(list, evsel) {
		if (add && get_event_modifier(&mod, str, evsel))
			return -EINVAL;

		evsel->core.attr.exclude_user   = mod.eu;
		evsel->core.attr.exclude_kernel = mod.ek;
		evsel->core.attr.exclude_hv     = mod.eh;
		evsel->core.attr.precise_ip     = mod.precise;
		evsel->core.attr.exclude_host   = mod.eH;
		evsel->core.attr.exclude_guest  = mod.eG;
		evsel->core.attr.exclude_idle   = mod.eI;
		evsel->exclude_GH          = mod.exclude_GH;
		evsel->sample_read         = mod.sample_read;
		evsel->precise_max         = mod.precise_max;
		evsel->weak_group	   = mod.weak;

		if (perf_evsel__is_group_leader(evsel))
			evsel->core.attr.pinned = mod.pinned;
	}

	return 0;
}

int parse_events_name(struct list_head *list, char *name)
{
	struct evsel *evsel;

	__evlist__for_each_entry(list, evsel) {
		if (!evsel->name)
			evsel->name = strdup(name);
	}

	return 0;
}

static int
comp_pmu(const void *p1, const void *p2)
{
	struct perf_pmu_event_symbol *pmu1 = (struct perf_pmu_event_symbol *) p1;
	struct perf_pmu_event_symbol *pmu2 = (struct perf_pmu_event_symbol *) p2;

	return strcasecmp(pmu1->symbol, pmu2->symbol);
}

static void perf_pmu__parse_cleanup(void)
{
	if (perf_pmu_events_list_num > 0) {
		struct perf_pmu_event_symbol *p;
		int i;

		for (i = 0; i < perf_pmu_events_list_num; i++) {
			p = perf_pmu_events_list + i;
			zfree(&p->symbol);
		}
		zfree(&perf_pmu_events_list);
		perf_pmu_events_list_num = 0;
	}
}

#define SET_SYMBOL(str, stype)		\
do {					\
	p->symbol = str;		\
	if (!p->symbol)			\
		goto err;		\
	p->type = stype;		\
} while (0)

/*
 * Read the pmu events list from sysfs
 * Save it into perf_pmu_events_list
 */
static void perf_pmu__parse_init(void)
{

	struct perf_pmu *pmu = NULL;
	struct perf_pmu_alias *alias;
	int len = 0;

	pmu = NULL;
	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
		list_for_each_entry(alias, &pmu->aliases, list) {
			if (strchr(alias->name, '-'))
				len++;
			len++;
		}
	}

	if (len == 0) {
		perf_pmu_events_list_num = -1;
		return;
	}
	perf_pmu_events_list = malloc(sizeof(struct perf_pmu_event_symbol) * len);
	if (!perf_pmu_events_list)
		return;
	perf_pmu_events_list_num = len;

	len = 0;
	pmu = NULL;
	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
		list_for_each_entry(alias, &pmu->aliases, list) {
			struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
			char *tmp = strchr(alias->name, '-');

			if (tmp != NULL) {
				SET_SYMBOL(strndup(alias->name, tmp - alias->name),
						PMU_EVENT_SYMBOL_PREFIX);
				p++;
				SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
				len += 2;
			} else {
				SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
				len++;
			}
		}
	}
	qsort(perf_pmu_events_list, len,
		sizeof(struct perf_pmu_event_symbol), comp_pmu);

	return;
err:
	perf_pmu__parse_cleanup();
}

enum perf_pmu_event_symbol_type
perf_pmu__parse_check(const char *name)
{
	struct perf_pmu_event_symbol p, *r;

	/* scan kernel pmu events from sysfs if needed */
	if (perf_pmu_events_list_num == 0)
		perf_pmu__parse_init();
	/*
	 * name "cpu" could be prefix of cpu-cycles or cpu// events.
	 * cpu-cycles has been handled by hardcode.
	 * So it must be cpu// events, not kernel pmu event.
	 */
	if ((perf_pmu_events_list_num <= 0) || !strcmp(name, "cpu"))
		return PMU_EVENT_SYMBOL_ERR;

	p.symbol = strdup(name);
	r = bsearch(&p, perf_pmu_events_list,
			(size_t) perf_pmu_events_list_num,
			sizeof(struct perf_pmu_event_symbol), comp_pmu);
	zfree(&p.symbol);
	return r ? r->type : PMU_EVENT_SYMBOL_ERR;
}

static int parse_events__scanner(const char *str, void *parse_state, int start_token)
{
	YY_BUFFER_STATE buffer;
	void *scanner;
	int ret;

	ret = parse_events_lex_init_extra(start_token, &scanner);
	if (ret)
		return ret;

	buffer = parse_events__scan_string(str, scanner);

#ifdef PARSER_DEBUG
	parse_events_debug = 1;
#endif
	ret = parse_events_parse(parse_state, scanner);

	parse_events__flush_buffer(buffer, scanner);
	parse_events__delete_buffer(buffer, scanner);
	parse_events_lex_destroy(scanner);
	return ret;
}

/*
 * parse event config string, return a list of event terms.
 */
int parse_events_terms(struct list_head *terms, const char *str)
{
	struct parse_events_state parse_state = {
		.terms = NULL,
	};
	int ret;

	ret = parse_events__scanner(str, &parse_state, PE_START_TERMS);
	if (!ret) {
		list_splice(parse_state.terms, terms);
		zfree(&parse_state.terms);
		return 0;
	}

	parse_events_terms__delete(parse_state.terms);
	return ret;
}

int parse_events(struct evlist *evlist, const char *str,
		 struct parse_events_error *err)
{
	struct parse_events_state parse_state = {
		.list   = LIST_HEAD_INIT(parse_state.list),
		.idx    = evlist->core.nr_entries,
		.error  = err,
		.evlist = evlist,
	};
	int ret;

	ret = parse_events__scanner(str, &parse_state, PE_START_EVENTS);
	perf_pmu__parse_cleanup();

	if (!ret && list_empty(&parse_state.list)) {
		WARN_ONCE(true, "WARNING: event parser found nothing\n");
		return -1;
	}

	/*
	 * Add list to the evlist even with errors to allow callers to clean up.
	 */
	perf_evlist__splice_list_tail(evlist, &parse_state.list);

	if (!ret) {
		struct evsel *last;

		evlist->nr_groups += parse_state.nr_groups;
		last = evlist__last(evlist);
		last->cmdline_group_boundary = true;

		return 0;
	}

	/*
	 * There are 2 users - builtin-record and builtin-test objects.
	 * Both call evlist__delete in case of error, so we dont
	 * need to bother.
	 */
	return ret;
}

#define MAX_WIDTH 1000
static int get_term_width(void)
{
	struct winsize ws;

	get_term_dimensions(&ws);
	return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
}

static void __parse_events_print_error(int err_idx, const char *err_str,
				const char *err_help, const char *event)
{
	const char *str = "invalid or unsupported event: ";
	char _buf[MAX_WIDTH];
	char *buf = (char *) event;
	int idx = 0;
	if (err_str) {
		/* -2 for extra '' in the final fprintf */
		int width       = get_term_width() - 2;
		int len_event   = strlen(event);
		int len_str, max_len, cut = 0;

		/*
		 * Maximum error index indent, we will cut
		 * the event string if it's bigger.
		 */
		int max_err_idx = 13;

		/*
		 * Let's be specific with the message when
		 * we have the precise error.
		 */
		str     = "event syntax error: ";
		len_str = strlen(str);
		max_len = width - len_str;

		buf = _buf;

		/* We're cutting from the beginning. */
		if (err_idx > max_err_idx)
			cut = err_idx - max_err_idx;

		strncpy(buf, event + cut, max_len);

		/* Mark cut parts with '..' on both sides. */
		if (cut)
			buf[0] = buf[1] = '.';

		if ((len_event - cut) > max_len) {
			buf[max_len - 1] = buf[max_len - 2] = '.';
			buf[max_len] = 0;
		}

		idx = len_str + err_idx - cut;
	}

	fprintf(stderr, "%s'%s'\n", str, buf);
	if (idx) {
		fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err_str);
		if (err_help)
			fprintf(stderr, "\n%s\n", err_help);
	}
}

void parse_events_print_error(struct parse_events_error *err,
			      const char *event)
{
	if (!err->num_errors)
		return;

	__parse_events_print_error(err->idx, err->str, err->help, event);
	zfree(&err->str);
	zfree(&err->help);

	if (err->num_errors > 1) {
		fputs("\nInitial error:\n", stderr);
		__parse_events_print_error(err->first_idx, err->first_str,
					err->first_help, event);
		zfree(&err->first_str);
		zfree(&err->first_help);
	}
}

#undef MAX_WIDTH

int parse_events_option(const struct option *opt, const char *str,
			int unset __maybe_unused)
{
	struct evlist *evlist = *(struct evlist **)opt->value;
	struct parse_events_error err;
	int ret;

	bzero(&err, sizeof(err));
	ret = parse_events(evlist, str, &err);

	if (ret) {
		parse_events_print_error(&err, str);
		fprintf(stderr, "Run 'perf list' for a list of valid events\n");
	}

	return ret;
}

static int
foreach_evsel_in_last_glob(struct evlist *evlist,
			   int (*func)(struct evsel *evsel,
				       const void *arg),
			   const void *arg)
{
	struct evsel *last = NULL;
	int err;

	/*
	 * Don't return when list_empty, give func a chance to report
	 * error when it found last == NULL.
	 *
	 * So no need to WARN here, let *func do this.
	 */
	if (evlist->core.nr_entries > 0)
		last = evlist__last(evlist);

	do {
		err = (*func)(last, arg);
		if (err)
			return -1;
		if (!last)
			return 0;

		if (last->core.node.prev == &evlist->core.entries)
			return 0;
		last = list_entry(last->core.node.prev, struct evsel, core.node);
	} while (!last->cmdline_group_boundary);

	return 0;
}

static int set_filter(struct evsel *evsel, const void *arg)
{
	const char *str = arg;
	bool found = false;
	int nr_addr_filters = 0;
	struct perf_pmu *pmu = NULL;

	if (evsel == NULL) {
		fprintf(stderr,
			"--filter option should follow a -e tracepoint or HW tracer option\n");
		return -1;
	}

	if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT) {
		if (perf_evsel__append_tp_filter(evsel, str) < 0) {
			fprintf(stderr,
				"not enough memory to hold filter string\n");
			return -1;
		}

		return 0;
	}

	while ((pmu = perf_pmu__scan(pmu)) != NULL)
		if (pmu->type == evsel->core.attr.type) {
			found = true;
			break;
		}

	if (found)
		perf_pmu__scan_file(pmu, "nr_addr_filters",
				    "%d", &nr_addr_filters);

	if (!nr_addr_filters) {
		fprintf(stderr,
			"This CPU does not support address filtering\n");
		return -1;
	}

	if (perf_evsel__append_addr_filter(evsel, str) < 0) {
		fprintf(stderr,
			"not enough memory to hold filter string\n");
		return -1;
	}

	return 0;
}

int parse_filter(const struct option *opt, const char *str,
		 int unset __maybe_unused)
{
	struct evlist *evlist = *(struct evlist **)opt->value;

	return foreach_evsel_in_last_glob(evlist, set_filter,
					  (const void *)str);
}

static int add_exclude_perf_filter(struct evsel *evsel,
				   const void *arg __maybe_unused)
{
	char new_filter[64];

	if (evsel == NULL || evsel->core.attr.type != PERF_TYPE_TRACEPOINT) {
		fprintf(stderr,
			"--exclude-perf option should follow a -e tracepoint option\n");
		return -1;
	}

	snprintf(new_filter, sizeof(new_filter), "common_pid != %d", getpid());

	if (perf_evsel__append_tp_filter(evsel, new_filter) < 0) {
		fprintf(stderr,
			"not enough memory to hold filter string\n");
		return -1;
	}

	return 0;
}

int exclude_perf(const struct option *opt,
		 const char *arg __maybe_unused,
		 int unset __maybe_unused)
{
	struct evlist *evlist = *(struct evlist **)opt->value;

	return foreach_evsel_in_last_glob(evlist, add_exclude_perf_filter,
					  NULL);
}

static const char * const event_type_descriptors[] = {
	"Hardware event",
	"Software event",
	"Tracepoint event",
	"Hardware cache event",
	"Raw hardware event descriptor",
	"Hardware breakpoint",
};

static int cmp_string(const void *a, const void *b)
{
	const char * const *as = a;
	const char * const *bs = b;

	return strcmp(*as, *bs);
}

/*
 * Print the events from <debugfs_mount_point>/tracing/events
 */

void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
			     bool name_only)
{
	DIR *sys_dir, *evt_dir;
	struct dirent *sys_dirent, *evt_dirent;
	char evt_path[MAXPATHLEN];
	char *dir_path;
	char **evt_list = NULL;
	unsigned int evt_i = 0, evt_num = 0;
	bool evt_num_known = false;

restart:
	sys_dir = tracing_events__opendir();
	if (!sys_dir)
		return;

	if (evt_num_known) {
		evt_list = zalloc(sizeof(char *) * evt_num);
		if (!evt_list)
			goto out_close_sys_dir;
	}

	for_each_subsystem(sys_dir, sys_dirent) {
		if (subsys_glob != NULL &&
		    !strglobmatch(sys_dirent->d_name, subsys_glob))
			continue;

		dir_path = get_events_file(sys_dirent->d_name);
		if (!dir_path)
			continue;
		evt_dir = opendir(dir_path);
		if (!evt_dir)
			goto next;

		for_each_event(dir_path, evt_dir, evt_dirent) {
			if (event_glob != NULL &&
			    !strglobmatch(evt_dirent->d_name, event_glob))
				continue;

			if (!evt_num_known) {
				evt_num++;
				continue;
			}

			snprintf(evt_path, MAXPATHLEN, "%s:%s",
				 sys_dirent->d_name, evt_dirent->d_name);

			evt_list[evt_i] = strdup(evt_path);
			if (evt_list[evt_i] == NULL) {
				put_events_file(dir_path);
				goto out_close_evt_dir;
			}
			evt_i++;
		}
		closedir(evt_dir);
next:
		put_events_file(dir_path);
	}
	closedir(sys_dir);

	if (!evt_num_known) {
		evt_num_known = true;
		goto restart;
	}
	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
	evt_i = 0;
	while (evt_i < evt_num) {
		if (name_only) {
			printf("%s ", evt_list[evt_i++]);
			continue;
		}
		printf("  %-50s [%s]\n", evt_list[evt_i++],
				event_type_descriptors[PERF_TYPE_TRACEPOINT]);
	}
	if (evt_num && pager_in_use())
		printf("\n");

out_free:
	evt_num = evt_i;
	for (evt_i = 0; evt_i < evt_num; evt_i++)
		zfree(&evt_list[evt_i]);
	zfree(&evt_list);
	return;

out_close_evt_dir:
	closedir(evt_dir);
out_close_sys_dir:
	closedir(sys_dir);

	printf("FATAL: not enough memory to print %s\n",
			event_type_descriptors[PERF_TYPE_TRACEPOINT]);
	if (evt_list)
		goto out_free;
}

/*
 * Check whether event is in <debugfs_mount_point>/tracing/events
 */

int is_valid_tracepoint(const char *event_string)
{
	DIR *sys_dir, *evt_dir;
	struct dirent *sys_dirent, *evt_dirent;
	char evt_path[MAXPATHLEN];
	char *dir_path;

	sys_dir = tracing_events__opendir();
	if (!sys_dir)
		return 0;

	for_each_subsystem(sys_dir, sys_dirent) {
		dir_path = get_events_file(sys_dirent->d_name);
		if (!dir_path)
			continue;
		evt_dir = opendir(dir_path);
		if (!evt_dir)
			goto next;

		for_each_event(dir_path, evt_dir, evt_dirent) {
			snprintf(evt_path, MAXPATHLEN, "%s:%s",
				 sys_dirent->d_name, evt_dirent->d_name);
			if (!strcmp(evt_path, event_string)) {
				closedir(evt_dir);
				closedir(sys_dir);
				return 1;
			}
		}
		closedir(evt_dir);
next:
		put_events_file(dir_path);
	}
	closedir(sys_dir);
	return 0;
}

static bool is_event_supported(u8 type, unsigned config)
{
	bool ret = true;
	int open_return;
	struct evsel *evsel;
	struct perf_event_attr attr = {
		.type = type,
		.config = config,
		.disabled = 1,
	};
	struct perf_thread_map *tmap = thread_map__new_by_tid(0);

	if (tmap == NULL)
		return false;

	evsel = evsel__new(&attr);
	if (evsel) {
		open_return = evsel__open(evsel, NULL, tmap);
		ret = open_return >= 0;

		if (open_return == -EACCES) {
			/*
			 * This happens if the paranoid value
			 * /proc/sys/kernel/perf_event_paranoid is set to 2
			 * Re-run with exclude_kernel set; we don't do that
			 * by default as some ARM machines do not support it.
			 *
			 */
			evsel->core.attr.exclude_kernel = 1;
			ret = evsel__open(evsel, NULL, tmap) >= 0;
		}
		evsel__delete(evsel);
	}

	perf_thread_map__put(tmap);
	return ret;
}

void print_sdt_events(const char *subsys_glob, const char *event_glob,
		      bool name_only)
{
	struct probe_cache *pcache;
	struct probe_cache_entry *ent;
	struct strlist *bidlist, *sdtlist;
	struct strlist_config cfg = {.dont_dupstr = true};
	struct str_node *nd, *nd2;
	char *buf, *path, *ptr = NULL;
	bool show_detail = false;
	int ret;

	sdtlist = strlist__new(NULL, &cfg);
	if (!sdtlist) {
		pr_debug("Failed to allocate new strlist for SDT\n");
		return;
	}
	bidlist = build_id_cache__list_all(true);
	if (!bidlist) {
		pr_debug("Failed to get buildids: %d\n", errno);
		return;
	}
	strlist__for_each_entry(nd, bidlist) {
		pcache = probe_cache__new(nd->s, NULL);
		if (!pcache)
			continue;
		list_for_each_entry(ent, &pcache->entries, node) {
			if (!ent->sdt)
				continue;
			if (subsys_glob &&
			    !strglobmatch(ent->pev.group, subsys_glob))
				continue;
			if (event_glob &&
			    !strglobmatch(ent->pev.event, event_glob))
				continue;
			ret = asprintf(&buf, "%s:%s@%s", ent->pev.group,
					ent->pev.event, nd->s);
			if (ret > 0)
				strlist__add(sdtlist, buf);
		}
		probe_cache__delete(pcache);
	}
	strlist__delete(bidlist);

	strlist__for_each_entry(nd, sdtlist) {
		buf = strchr(nd->s, '@');
		if (buf)
			*(buf++) = '\0';
		if (name_only) {
			printf("%s ", nd->s);
			continue;
		}
		nd2 = strlist__next(nd);
		if (nd2) {
			ptr = strchr(nd2->s, '@');
			if (ptr)
				*ptr = '\0';
			if (strcmp(nd->s, nd2->s) == 0)
				show_detail = true;
		}
		if (show_detail) {
			path = build_id_cache__origname(buf);
			ret = asprintf(&buf, "%s@%s(%.12s)", nd->s, path, buf);
			if (ret > 0) {
				printf("  %-50s [%s]\n", buf, "SDT event");
				free(buf);
			}
			free(path);
		} else
			printf("  %-50s [%s]\n", nd->s, "SDT event");
		if (nd2) {
			if (strcmp(nd->s, nd2->s) != 0)
				show_detail = false;
			if (ptr)
				*ptr = '@';
		}
	}
	strlist__delete(sdtlist);
}

int print_hwcache_events(const char *event_glob, bool name_only)
{
	unsigned int type, op, i, evt_i = 0, evt_num = 0;
	char name[64];
	char **evt_list = NULL;
	bool evt_num_known = false;

restart:
	if (evt_num_known) {
		evt_list = zalloc(sizeof(char *) * evt_num);
		if (!evt_list)
			goto out_enomem;
	}

	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
			/* skip invalid cache type */
			if (!perf_evsel__is_cache_op_valid(type, op))
				continue;

			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
				__perf_evsel__hw_cache_type_op_res_name(type, op, i,
									name, sizeof(name));
				if (event_glob != NULL && !strglobmatch(name, event_glob))
					continue;

				if (!is_event_supported(PERF_TYPE_HW_CACHE,
							type | (op << 8) | (i << 16)))
					continue;

				if (!evt_num_known) {
					evt_num++;
					continue;
				}

				evt_list[evt_i] = strdup(name);
				if (evt_list[evt_i] == NULL)
					goto out_enomem;
				evt_i++;
			}
		}
	}

	if (!evt_num_known) {
		evt_num_known = true;
		goto restart;
	}
	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
	evt_i = 0;
	while (evt_i < evt_num) {
		if (name_only) {
			printf("%s ", evt_list[evt_i++]);
			continue;
		}
		printf("  %-50s [%s]\n", evt_list[evt_i++],
				event_type_descriptors[PERF_TYPE_HW_CACHE]);
	}
	if (evt_num && pager_in_use())
		printf("\n");

out_free:
	evt_num = evt_i;
	for (evt_i = 0; evt_i < evt_num; evt_i++)
		zfree(&evt_list[evt_i]);
	zfree(&evt_list);
	return evt_num;

out_enomem:
	printf("FATAL: not enough memory to print %s\n", event_type_descriptors[PERF_TYPE_HW_CACHE]);
	if (evt_list)
		goto out_free;
	return evt_num;
}

static void print_tool_event(const char *name, const char *event_glob,
			     bool name_only)
{
	if (event_glob && !strglobmatch(name, event_glob))
		return;
	if (name_only)
		printf("%s ", name);
	else
		printf("  %-50s [%s]\n", name, "Tool event");

}

void print_tool_events(const char *event_glob, bool name_only)
{
	print_tool_event("duration_time", event_glob, name_only);
	if (pager_in_use())
		printf("\n");
}

void print_symbol_events(const char *event_glob, unsigned type,
				struct event_symbol *syms, unsigned max,
				bool name_only)
{
	unsigned int i, evt_i = 0, evt_num = 0;
	char name[MAX_NAME_LEN];
	char **evt_list = NULL;
	bool evt_num_known = false;

restart:
	if (evt_num_known) {
		evt_list = zalloc(sizeof(char *) * evt_num);
		if (!evt_list)
			goto out_enomem;
		syms -= max;
	}

	for (i = 0; i < max; i++, syms++) {

		if (event_glob != NULL && syms->symbol != NULL &&
		    !(strglobmatch(syms->symbol, event_glob) ||
		      (syms->alias && strglobmatch(syms->alias, event_glob))))
			continue;

		if (!is_event_supported(type, i))
			continue;

		if (!evt_num_known) {
			evt_num++;
			continue;
		}

		if (!name_only && strlen(syms->alias))
			snprintf(name, MAX_NAME_LEN, "%s OR %s", syms->symbol, syms->alias);
		else
			strlcpy(name, syms->symbol, MAX_NAME_LEN);

		evt_list[evt_i] = strdup(name);
		if (evt_list[evt_i] == NULL)
			goto out_enomem;
		evt_i++;
	}

	if (!evt_num_known) {
		evt_num_known = true;
		goto restart;
	}
	qsort(evt_list, evt_num, sizeof(char *), cmp_string);
	evt_i = 0;
	while (evt_i < evt_num) {
		if (name_only) {
			printf("%s ", evt_list[evt_i++]);
			continue;
		}
		printf("  %-50s [%s]\n", evt_list[evt_i++], event_type_descriptors[type]);
	}
	if (evt_num && pager_in_use())
		printf("\n");

out_free:
	evt_num = evt_i;
	for (evt_i = 0; evt_i < evt_num; evt_i++)
		zfree(&evt_list[evt_i]);
	zfree(&evt_list);
	return;

out_enomem:
	printf("FATAL: not enough memory to print %s\n", event_type_descriptors[type]);
	if (evt_list)
		goto out_free;
}

/*
 * Print the help text for the event symbols:
 */
void print_events(const char *event_glob, bool name_only, bool quiet_flag,
			bool long_desc, bool details_flag, bool deprecated)
{
	print_symbol_events(event_glob, PERF_TYPE_HARDWARE,
			    event_symbols_hw, PERF_COUNT_HW_MAX, name_only);

	print_symbol_events(event_glob, PERF_TYPE_SOFTWARE,
			    event_symbols_sw, PERF_COUNT_SW_MAX, name_only);
	print_tool_events(event_glob, name_only);

	print_hwcache_events(event_glob, name_only);

	print_pmu_events(event_glob, name_only, quiet_flag, long_desc,
			details_flag, deprecated);

	if (event_glob != NULL)
		return;

	if (!name_only) {
		printf("  %-50s [%s]\n",
		       "rNNN",
		       event_type_descriptors[PERF_TYPE_RAW]);
		printf("  %-50s [%s]\n",
		       "cpu/t1=v1[,t2=v2,t3 ...]/modifier",
		       event_type_descriptors[PERF_TYPE_RAW]);
		if (pager_in_use())
			printf("   (see 'man perf-list' on how to encode it)\n\n");

		printf("  %-50s [%s]\n",
		       "mem:<addr>[/len][:access]",
			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
		if (pager_in_use())
			printf("\n");
	}

	print_tracepoint_events(NULL, NULL, name_only);

	print_sdt_events(NULL, NULL, name_only);

	metricgroup__print(true, true, NULL, name_only, details_flag);
}

int parse_events__is_hardcoded_term(struct parse_events_term *term)
{
	return term->type_term != PARSE_EVENTS__TERM_TYPE_USER;
}

static int new_term(struct parse_events_term **_term,
		    struct parse_events_term *temp,
		    char *str, u64 num)
{
	struct parse_events_term *term;

	term = malloc(sizeof(*term));
	if (!term)
		return -ENOMEM;

	*term = *temp;
	INIT_LIST_HEAD(&term->list);
	term->weak = false;

	switch (term->type_val) {
	case PARSE_EVENTS__TERM_TYPE_NUM:
		term->val.num = num;
		break;
	case PARSE_EVENTS__TERM_TYPE_STR:
		term->val.str = str;
		break;
	default:
		free(term);
		return -EINVAL;
	}

	*_term = term;
	return 0;
}

int parse_events_term__num(struct parse_events_term **term,
			   int type_term, char *config, u64 num,
			   bool no_value,
			   void *loc_term_, void *loc_val_)
{
	YYLTYPE *loc_term = loc_term_;
	YYLTYPE *loc_val = loc_val_;

	struct parse_events_term temp = {
		.type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
		.type_term = type_term,
		.config    = config,
		.no_value  = no_value,
		.err_term  = loc_term ? loc_term->first_column : 0,
		.err_val   = loc_val  ? loc_val->first_column  : 0,
	};

	return new_term(term, &temp, NULL, num);
}

int parse_events_term__str(struct parse_events_term **term,
			   int type_term, char *config, char *str,
			   void *loc_term_, void *loc_val_)
{
	YYLTYPE *loc_term = loc_term_;
	YYLTYPE *loc_val = loc_val_;

	struct parse_events_term temp = {
		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
		.type_term = type_term,
		.config    = config,
		.err_term  = loc_term ? loc_term->first_column : 0,
		.err_val   = loc_val  ? loc_val->first_column  : 0,
	};

	return new_term(term, &temp, str, 0);
}

int parse_events_term__sym_hw(struct parse_events_term **term,
			      char *config, unsigned idx)
{
	struct event_symbol *sym;
	char *str;
	struct parse_events_term temp = {
		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
		.type_term = PARSE_EVENTS__TERM_TYPE_USER,
		.config    = config,
	};

	if (!temp.config) {
		temp.config = strdup("event");
		if (!temp.config)
			return -ENOMEM;
	}
	BUG_ON(idx >= PERF_COUNT_HW_MAX);
	sym = &event_symbols_hw[idx];

	str = strdup(sym->symbol);
	if (!str)
		return -ENOMEM;
	return new_term(term, &temp, str, 0);
}

int parse_events_term__clone(struct parse_events_term **new,
			     struct parse_events_term *term)
{
	char *str;
	struct parse_events_term temp = {
		.type_val  = term->type_val,
		.type_term = term->type_term,
		.config    = NULL,
		.err_term  = term->err_term,
		.err_val   = term->err_val,
	};

	if (term->config) {
		temp.config = strdup(term->config);
		if (!temp.config)
			return -ENOMEM;
	}
	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
		return new_term(new, &temp, NULL, term->val.num);

	str = strdup(term->val.str);
	if (!str)
		return -ENOMEM;
	return new_term(new, &temp, str, 0);
}

void parse_events_term__delete(struct parse_events_term *term)
{
	if (term->array.nr_ranges)
		zfree(&term->array.ranges);

	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
		zfree(&term->val.str);

	zfree(&term->config);
	free(term);
}

int parse_events_copy_term_list(struct list_head *old,
				 struct list_head **new)
{
	struct parse_events_term *term, *n;
	int ret;

	if (!old) {
		*new = NULL;
		return 0;
	}

	*new = malloc(sizeof(struct list_head));
	if (!*new)
		return -ENOMEM;
	INIT_LIST_HEAD(*new);

	list_for_each_entry (term, old, list) {
		ret = parse_events_term__clone(&n, term);
		if (ret)
			return ret;
		list_add_tail(&n->list, *new);
	}
	return 0;
}

void parse_events_terms__purge(struct list_head *terms)
{
	struct parse_events_term *term, *h;

	list_for_each_entry_safe(term, h, terms, list) {
		list_del_init(&term->list);
		parse_events_term__delete(term);
	}
}

void parse_events_terms__delete(struct list_head *terms)
{
	if (!terms)
		return;
	parse_events_terms__purge(terms);
	free(terms);
}

void parse_events__clear_array(struct parse_events_array *a)
{
	zfree(&a->ranges);
}

void parse_events_evlist_error(struct parse_events_state *parse_state,
			       int idx, const char *str)
{
	if (!parse_state->error)
		return;

	parse_events__handle_error(parse_state->error, idx, strdup(str), NULL);
}

static void config_terms_list(char *buf, size_t buf_sz)
{
	int i;
	bool first = true;

	buf[0] = '\0';
	for (i = 0; i < __PARSE_EVENTS__TERM_TYPE_NR; i++) {
		const char *name = config_term_names[i];

		if (!config_term_avail(i, NULL))
			continue;
		if (!name)
			continue;
		if (name[0] == '<')
			continue;

		if (strlen(buf) + strlen(name) + 2 >= buf_sz)
			return;

		if (!first)
			strcat(buf, ",");
		else
			first = false;
		strcat(buf, name);
	}
}

/*
 * Return string contains valid config terms of an event.
 * @additional_terms: For terms such as PMU sysfs terms.
 */
char *parse_events_formats_error_string(char *additional_terms)
{
	char *str;
	/* "no-overwrite" is the longest name */
	char static_terms[__PARSE_EVENTS__TERM_TYPE_NR *
			  (sizeof("no-overwrite") - 1)];

	config_terms_list(static_terms, sizeof(static_terms));
	/* valid terms */
	if (additional_terms) {
		if (asprintf(&str, "valid terms: %s,%s",
			     additional_terms, static_terms) < 0)
			goto fail;
	} else {
		if (asprintf(&str, "valid terms: %s", static_terms) < 0)
			goto fail;
	}
	return str;

fail:
	return NULL;
}