treewide: refresh kmalloc_obj() conversionsgrafted

This is another run of the Coccinelle script for converting kmalloc()
family of allocations to kmalloc_obj() via the existing rules in
scripts/coccinelle/api/kmalloc_objs.cocci

This catches both the set of kmalloc() uses added since the first
kmalloc_obj() conversions in v7.0 and adds a large group missed in the
first pass due to Coccinelle not interacting well with the cleanup.h
scoped_...() family of macros[1]. I worked around this with spatch's
"--macro-file" argument to a file with all the scoped_...() macros mapped
to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control
flow indicator I could find.

Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc,
riscv, and s390 with no new warnings.

Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1]
Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2]
Signed-off-by: Kees Cook <kees+treewide@kernel.org>

1 files changed, 4758 insertions, 0 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
new file mode 100644
index 000000000..d4cb455f4
--- /dev/null
+++ b/tools/perf/util/evsel.c
@@ -0,0 +1,4758 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
+ *
+ * Parts came from builtin-{top,stat,record}.c, see those files for further
+ * copyright notes.
+ */
+/*
+ * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
+ * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
+ */
+#define __SANE_USERSPACE_TYPES__
+
+#include "evsel.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <dirent.h>
+#include <linux/bitops.h>
+#include <linux/bitmap.h>
+#include <linux/compiler.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/perf_event.h>
+#include <linux/zalloc.h>
+#include <sys/ioctl.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+
+#include <api/fs/fs.h>
+#include <api/fs/tracing_path.h>
+#include <byteswap.h>
+#include <internal/lib.h>
+#include <internal/threadmap.h>
+#include <internal/xyarray.h>
+#include <perf/cpumap.h>
+#include <perf/evsel.h>
+
+#include "../perf-sys.h"
+#include "asm/bug.h"
+#include "bpf-filter.h"
+#include "bpf_counter.h"
+#include "callchain.h"
+#include "cgroup.h"
+#include "counts.h"
+#include "debug.h"
+#include "drm_pmu.h"
+#include "dwarf-regs.h"
+#include "env.h"
+#include "event.h"
+#include "evlist.h"
+#include "evsel_config.h"
+#include "evsel_fprintf.h"
+#include "hashmap.h"
+#include "hist.h"
+#include "hwmon_pmu.h"
+#include "intel-tpebs.h"
+#include "memswap.h"
+#include "off_cpu.h"
+#include "parse-branch-options.h"
+#include "perf_regs.h"
+#include "pmu.h"
+#include "pmus.h"
+#include "record.h"
+#include "rlimit.h"
+#include "session.h"
+#include "stat.h"
+#include "string2.h"
+#include "target.h"
+#include "thread_map.h"
+#include "time-utils.h"
+#include "tool_pmu.h"
+#include "tp_pmu.h"
+#include "trace-event.h"
+#include "util.h"
+
+#ifdef HAVE_LIBTRACEEVENT
+#include <event-parse.h>
+#endif
+
+struct perf_missing_features perf_missing_features;
+
+static clockid_t clockid;
+
+static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
+{
+	return 0;
+}
+
+static bool test_attr__enabled(void)
+{
+	static bool test_attr__enabled;
+	static bool test_attr__enabled_tested;
+
+	if (!test_attr__enabled_tested) {
+		char *dir = getenv("PERF_TEST_ATTR");
+
+		test_attr__enabled = (dir != NULL);
+		test_attr__enabled_tested = true;
+	}
+	return test_attr__enabled;
+}
+
+#define __WRITE_ASS(str, fmt, data)					\
+do {									\
+	if (fprintf(file, #str "=%"fmt "\n", data) < 0) {		\
+		perror("test attr - failed to write event file");	\
+		fclose(file);						\
+		return -1;						\
+	}								\
+} while (0)
+
+#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
+
+static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
+		       int fd, int group_fd, unsigned long flags)
+{
+	FILE *file;
+	char path[PATH_MAX];
+	char *dir = getenv("PERF_TEST_ATTR");
+
+	snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
+		 attr->type, attr->config, fd);
+
+	file = fopen(path, "w+");
+	if (!file) {
+		perror("test attr - failed to open event file");
+		return -1;
+	}
+
+	if (fprintf(file, "[event-%d-%llu-%d]\n",
+		    attr->type, attr->config, fd) < 0) {
+		perror("test attr - failed to write event file");
+		fclose(file);
+		return -1;
+	}
+
+	/* syscall arguments */
+	__WRITE_ASS(fd,       "d", fd);
+	__WRITE_ASS(group_fd, "d", group_fd);
+	__WRITE_ASS(cpu,      "d", cpu.cpu);
+	__WRITE_ASS(pid,      "d", pid);
+	__WRITE_ASS(flags,   "lu", flags);
+
+	/* struct perf_event_attr */
+	WRITE_ASS(type,   PRIu32);
+	WRITE_ASS(size,   PRIu32);
+	WRITE_ASS(config,  "llu");
+	WRITE_ASS(sample_period, "llu");
+	WRITE_ASS(sample_type,   "llu");
+	WRITE_ASS(read_format,   "llu");
+	WRITE_ASS(disabled,       "d");
+	WRITE_ASS(inherit,        "d");
+	WRITE_ASS(pinned,         "d");
+	WRITE_ASS(exclusive,      "d");
+	WRITE_ASS(exclude_user,   "d");
+	WRITE_ASS(exclude_kernel, "d");
+	WRITE_ASS(exclude_hv,     "d");
+	WRITE_ASS(exclude_idle,   "d");
+	WRITE_ASS(mmap,           "d");
+	WRITE_ASS(comm,           "d");
+	WRITE_ASS(freq,           "d");
+	WRITE_ASS(inherit_stat,   "d");
+	WRITE_ASS(enable_on_exec, "d");
+	WRITE_ASS(task,           "d");
+	WRITE_ASS(watermark,      "d");
+	WRITE_ASS(precise_ip,     "d");
+	WRITE_ASS(mmap_data,      "d");
+	WRITE_ASS(sample_id_all,  "d");
+	WRITE_ASS(exclude_host,   "d");
+	WRITE_ASS(exclude_guest,  "d");
+	WRITE_ASS(exclude_callchain_kernel, "d");
+	WRITE_ASS(exclude_callchain_user, "d");
+	WRITE_ASS(mmap2,	  "d");
+	WRITE_ASS(comm_exec,	  "d");
+	WRITE_ASS(context_switch, "d");
+	WRITE_ASS(write_backward, "d");
+	WRITE_ASS(namespaces,	  "d");
+	WRITE_ASS(use_clockid,    "d");
+	WRITE_ASS(wakeup_events, PRIu32);
+	WRITE_ASS(bp_type, PRIu32);
+	WRITE_ASS(config1, "llu");
+	WRITE_ASS(config2, "llu");
+	WRITE_ASS(branch_sample_type, "llu");
+	WRITE_ASS(sample_regs_user,   "llu");
+	WRITE_ASS(sample_stack_user,  PRIu32);
+
+	fclose(file);
+	return 0;
+}
+
+#undef __WRITE_ASS
+#undef WRITE_ASS
+
+static void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
+		     int fd, int group_fd, unsigned long flags)
+{
+	int errno_saved = errno;
+
+	if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
+		pr_err("test attr FAILED");
+		exit(128);
+	}
+
+	errno = errno_saved;
+}
+
+static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
+{
+}
+
+static struct {
+	size_t	size;
+	int	(*init)(struct evsel *evsel);
+	void	(*fini)(struct evsel *evsel);
+} perf_evsel__object = {
+	.size = sizeof(struct evsel),
+	.init = evsel__no_extra_init,
+	.fini = evsel__no_extra_fini,
+};
+
+int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
+			 void (*fini)(struct evsel *evsel))
+{
+
+	if (object_size == 0)
+		goto set_methods;
+
+	if (perf_evsel__object.size > object_size)
+		return -EINVAL;
+
+	perf_evsel__object.size = object_size;
+
+set_methods:
+	if (init != NULL)
+		perf_evsel__object.init = init;
+
+	if (fini != NULL)
+		perf_evsel__object.fini = fini;
+
+	return 0;
+}
+
+const char *evsel__pmu_name(const struct evsel *evsel)
+{
+	struct perf_pmu *pmu = evsel__find_pmu(evsel);
+
+	if (pmu)
+		return pmu->name;
+
+	return event_type(evsel->core.attr.type);
+}
+
+enum evsel_probe_type {
+	PROBE__UNKNOWN	= 0,
+	PROBE__NOPE	= 1,
+	PROBE__KPROBE	= 2,
+	PROBE__UPROBE	= 3,
+	/*
+	 * Ftrace-based dynamic probes (kprobes/uprobes/fprobes created via
+	 * tracefs) report PMU "tracepoint", not "kprobe"/"uprobe".  Detect
+	 * them by the __probe_ip field that the kernel adds to all dynamic
+	 * probe formats.
+	 */
+	PROBE__FTRACE	= 4,
+};
+
+static void evsel__resolve_probe_type(struct evsel *evsel)
+{
+	const char *name = evsel__pmu_name(evsel);
+
+	if (!strcmp(name, "kprobe"))
+		evsel->probe_type = PROBE__KPROBE;
+	else if (!strcmp(name, "uprobe"))
+		evsel->probe_type = PROBE__UPROBE;
+	else if (!strcmp(name, "tracepoint") && evsel__field(evsel, "__probe_ip"))
+		evsel->probe_type = PROBE__FTRACE;
+	else
+		evsel->probe_type = PROBE__NOPE;
+}
+
+bool evsel__is_probe(struct evsel *evsel)
+{
+	if (evsel->probe_type == PROBE__UNKNOWN)
+		evsel__resolve_probe_type(evsel);
+
+	return evsel->probe_type > PROBE__NOPE;
+}
+
+bool evsel__is_kprobe(struct evsel *evsel)
+{
+	if (evsel->probe_type == PROBE__UNKNOWN)
+		evsel__resolve_probe_type(evsel);
+
+	return evsel->probe_type == PROBE__KPROBE;
+}
+
+bool evsel__is_uprobe(struct evsel *evsel)
+{
+	if (evsel->probe_type == PROBE__UNKNOWN)
+		evsel__resolve_probe_type(evsel);
+
+	return evsel->probe_type == PROBE__UPROBE;
+}
+
+#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
+
+int __evsel__sample_size(u64 sample_type)
+{
+	u64 mask = sample_type & PERF_SAMPLE_MASK;
+	int size = 0;
+	int i;
+
+	for (i = 0; i < 64; i++) {
+		if (mask & (1ULL << i))
+			size++;
+	}
+
+	size *= sizeof(u64);
+
+	return size;
+}
+
+/**
+ * __perf_evsel__calc_id_pos - calculate id_pos.
+ * @sample_type: sample type
+ *
+ * This function returns the position of the event id (PERF_SAMPLE_ID or
+ * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
+ * perf_record_sample.
+ */
+static int __perf_evsel__calc_id_pos(u64 sample_type)
+{
+	int idx = 0;
+
+	if (sample_type & PERF_SAMPLE_IDENTIFIER)
+		return 0;
+
+	if (!(sample_type & PERF_SAMPLE_ID))
+		return -1;
+
+	if (sample_type & PERF_SAMPLE_IP)
+		idx += 1;
+
+	if (sample_type & PERF_SAMPLE_TID)
+		idx += 1;
+
+	if (sample_type & PERF_SAMPLE_TIME)
+		idx += 1;
+
+	if (sample_type & PERF_SAMPLE_ADDR)
+		idx += 1;
+
+	return idx;
+}
+
+/**
+ * __perf_evsel__calc_is_pos - calculate is_pos.
+ * @sample_type: sample type
+ *
+ * This function returns the position (counting backwards) of the event id
+ * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
+ * sample_id_all is used there is an id sample appended to non-sample events.
+ */
+static int __perf_evsel__calc_is_pos(u64 sample_type)
+{
+	int idx = 1;
+
+	if (sample_type & PERF_SAMPLE_IDENTIFIER)
+		return 1;
+
+	if (!(sample_type & PERF_SAMPLE_ID))
+		return -1;
+
+	if (sample_type & PERF_SAMPLE_CPU)
+		idx += 1;
+
+	if (sample_type & PERF_SAMPLE_STREAM_ID)
+		idx += 1;
+
+	return idx;
+}
+
+void evsel__calc_id_pos(struct evsel *evsel)
+{
+	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
+	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
+}
+
+void __evsel__set_sample_bit(struct evsel *evsel,
+				  enum perf_event_sample_format bit)
+{
+	if (!(evsel->core.attr.sample_type & bit)) {
+		evsel->core.attr.sample_type |= bit;
+		evsel->sample_size += sizeof(u64);
+		evsel__calc_id_pos(evsel);
+	}
+}
+
+void __evsel__reset_sample_bit(struct evsel *evsel,
+				    enum perf_event_sample_format bit)
+{
+	if (evsel->core.attr.sample_type & bit) {
+		evsel->core.attr.sample_type &= ~bit;
+		evsel->sample_size -= sizeof(u64);
+		evsel__calc_id_pos(evsel);
+	}
+}
+
+void evsel__set_sample_id(struct evsel *evsel,
+			       bool can_sample_identifier)
+{
+	if (can_sample_identifier) {
+		evsel__reset_sample_bit(evsel, ID);
+		evsel__set_sample_bit(evsel, IDENTIFIER);
+	} else {
+		evsel__set_sample_bit(evsel, ID);
+	}
+	evsel->core.attr.read_format |= PERF_FORMAT_ID;
+}
+
+bool evsel__is_non_perf_event_open_pmu(const struct evsel *evsel)
+{
+	return evsel->pmu && evsel->pmu->type > PERF_PMU_TYPE_PE_END;
+}
+
+/**
+ * evsel__is_function_event - Return whether given evsel is a function
+ * trace event
+ *
+ * @evsel - evsel selector to be tested
+ *
+ * Return %true if event is function trace event
+ */
+bool evsel__is_function_event(struct evsel *evsel)
+{
+#define FUNCTION_EVENT "ftrace:function"
+
+	return evsel->name &&
+	       !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
+
+#undef FUNCTION_EVENT
+}
+
+static void evsel__init(struct evsel *evsel,
+		 struct perf_event_attr *attr, int idx)
+{
+	perf_evsel__init(&evsel->core, attr, idx);
+	refcount_set(&evsel->refcnt, 1);
+	evsel->tracking	   = !idx;
+	evsel->unit	   = strdup("");
+	evsel->scale	   = 1.0;
+	evsel->max_events  = ULONG_MAX;
+	evsel->evlist	   = NULL;
+	INIT_LIST_HEAD(&evsel->config_terms);
+	INIT_LIST_HEAD(&evsel->bpf_counter_list);
+	INIT_LIST_HEAD(&evsel->bpf_filters);
+	perf_evsel__object.init(evsel);
+	evsel->sample_size = __evsel__sample_size(attr->sample_type);
+	evsel__calc_id_pos(evsel);
+	evsel->cmdline_group_boundary = false;
+	evsel->per_pkg_mask  = NULL;
+	evsel->collect_stat  = false;
+	evsel->group_pmu_name = NULL;
+	evsel->skippable     = false;
+	evsel->supported     = true;
+	evsel->alternate_hw_config = PERF_COUNT_HW_MAX;
+	evsel->script_output_type = -1; // FIXME: OUTPUT_TYPE_UNSET, see builtin-script.c
+	evsel->probe_type = PROBE__UNKNOWN;
+}
+
+struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
+{
+	struct evsel *evsel = zalloc(perf_evsel__object.size);
+
+	if (!evsel)
+		return NULL;
+	evsel__init(evsel, attr, idx);
+
+	if (evsel__is_bpf_output(evsel) && !attr->sample_type) {
+		evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
+					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
+		evsel->core.attr.sample_period = 1;
+	}
+
+	if (evsel__is_clock(evsel)) {
+		free((char *)evsel->unit);
+		evsel->unit = strdup("msec");
+		evsel->scale = 1e-6;
+	}
+
+	return evsel;
+}
+
+int copy_config_terms(struct list_head *dst, struct list_head *src)
+{
+	struct evsel_config_term *pos, *tmp;
+
+	list_for_each_entry(pos, src, list) {
+		tmp = malloc(sizeof(*tmp));
+		if (tmp == NULL)
+			return -ENOMEM;
+
+		*tmp = *pos;
+		if (tmp->free_str) {
+			tmp->val.str = strdup(pos->val.str);
+			if (tmp->val.str == NULL) {
+				free(tmp);
+				return -ENOMEM;
+			}
+		}
+		list_add_tail(&tmp->list, dst);
+	}
+	return 0;
+}
+
+static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
+{
+	return copy_config_terms(&dst->config_terms, &src->config_terms);
+}
+
+/**
+ * evsel__clone - create a new evsel copied from @orig
+ * @orig: original evsel
+ *
+ * The assumption is that @orig is not configured nor opened yet.
+ * So we only care about the attributes that can be set while it's parsed.
+ */
+struct evsel *evsel__clone(struct evsel *orig)
+{
+	struct evsel *evsel;
+
+	BUG_ON(orig->core.fd);
+	BUG_ON(orig->counts);
+	BUG_ON(orig->priv);
+	BUG_ON(orig->per_pkg_mask);
+
+	evsel = evsel__new(&orig->core.attr);
+	if (evsel == NULL)
+		return NULL;
+
+	evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
+	evsel->core.pmu_cpus = perf_cpu_map__get(orig->core.pmu_cpus);
+	evsel->core.threads = perf_thread_map__get(orig->core.threads);
+	evsel->core.nr_members = orig->core.nr_members;
+	evsel->core.system_wide = orig->core.system_wide;
+	evsel->core.requires_cpu = orig->core.requires_cpu;
+	evsel->core.is_pmu_core = orig->core.is_pmu_core;
+
+	if (orig->name) {
+		evsel->name = strdup(orig->name);
+		if (evsel->name == NULL)
+			goto out_err;
+	}
+	if (orig->group_name) {
+		evsel->group_name = strdup(orig->group_name);
+		if (evsel->group_name == NULL)
+			goto out_err;
+	}
+	if (orig->group_pmu_name) {
+		evsel->group_pmu_name = strdup(orig->group_pmu_name);
+		if (evsel->group_pmu_name == NULL)
+			goto out_err;
+	}
+	if (orig->filter) {
+		evsel->filter = strdup(orig->filter);
+		if (evsel->filter == NULL)
+			goto out_err;
+	}
+	if (orig->metric_id) {
+		evsel->metric_id = strdup(orig->metric_id);
+		if (evsel->metric_id == NULL)
+			goto out_err;
+	}
+	evsel->cgrp = cgroup__get(orig->cgrp);
+#ifdef HAVE_LIBTRACEEVENT
+	if (orig->tp_sys) {
+		evsel->tp_sys = strdup(orig->tp_sys);
+		if (evsel->tp_sys == NULL)
+			goto out_err;
+	}
+	if (orig->tp_name) {
+		evsel->tp_name = strdup(orig->tp_name);
+		if (evsel->tp_name == NULL)
+			goto out_err;
+	}
+	evsel->tp_format = orig->tp_format;
+#endif
+	evsel->handler = orig->handler;
+	evsel->core.leader = orig->core.leader;
+	evsel->metric_leader = orig->metric_leader;
+
+	evsel->max_events = orig->max_events;
+	zfree(&evsel->unit);
+	if (orig->unit) {
+		evsel->unit = strdup(orig->unit);
+		if (evsel->unit == NULL)
+			goto out_err;
+	}
+	evsel->scale = orig->scale;
+	evsel->snapshot = orig->snapshot;
+	evsel->per_pkg = orig->per_pkg;
+	evsel->percore = orig->percore;
+	evsel->precise_max = orig->precise_max;
+	evsel->is_libpfm_event = orig->is_libpfm_event;
+
+	evsel->exclude_GH = orig->exclude_GH;
+	evsel->sample_read = orig->sample_read;
+	evsel->collect_stat = orig->collect_stat;
+	evsel->weak_group = orig->weak_group;
+	evsel->bpf_counter = orig->bpf_counter;
+	evsel->use_config_name = orig->use_config_name;
+	evsel->skippable = orig->skippable;
+	evsel->dont_regroup = orig->dont_regroup;
+	evsel->default_metricgroup = orig->default_metricgroup;
+	evsel->default_show_events = orig->default_show_events;
+
+	evsel->pmu = orig->pmu;
+	evsel->first_wildcard_match = orig->first_wildcard_match;
+
+	if (evsel__copy_config_terms(evsel, orig) < 0)
+		goto out_err;
+
+	evsel->alternate_hw_config = orig->alternate_hw_config;
+
+	evsel->retire_lat = orig->retire_lat;
+	if (evsel->retire_lat)
+		evsel->retirement_latency = orig->retirement_latency;
+
+	return evsel;
+
+out_err:
+	evsel__put(evsel);
+	return NULL;
+}
+
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
+struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format)
+{
+	struct perf_event_attr attr = {
+		.type	       = PERF_TYPE_TRACEPOINT,
+		.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
+				PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
+	};
+	struct evsel *evsel = zalloc(perf_evsel__object.size);
+	int err = -ENOMEM, id = -1;
+
+	if (evsel == NULL)
+		goto out_err;
+
+
+	if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
+		goto out_free;
+
+#ifdef HAVE_LIBTRACEEVENT
+	evsel->tp_sys = strdup(sys);
+	if (!evsel->tp_sys)
+		goto out_free;
+
+	evsel->tp_name = strdup(name);
+	if (!evsel->tp_name)
+		goto out_free;
+#endif
+
+	event_attr_init(&attr);
+
+	if (format) {
+		id = tp_pmu__id(sys, name);
+		if (id < 0) {
+			err = id;
+			goto out_free;
+		}
+	}
+	attr.config = (__u64)id;
+	attr.sample_period = 1;
+	evsel__init(evsel, &attr, idx);
+	return evsel;
+
+out_free:
+	zfree(&evsel->name);
+#ifdef HAVE_LIBTRACEEVENT
+	zfree(&evsel->tp_sys);
+	zfree(&evsel->tp_name);
+#endif
+	free(evsel);
+out_err:
+	return ERR_PTR(err);
+}
+
+struct evsel *evsel__get(struct evsel *evsel)
+{
+	refcount_inc(&evsel->refcnt);
+	return evsel;
+}
+
+#ifdef HAVE_LIBTRACEEVENT
+struct tep_event *evsel__tp_format(struct evsel *evsel)
+{
+	struct tep_event *tp_format = evsel->tp_format;
+
+	if (tp_format)
+		return tp_format;
+
+	if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
+		return NULL;
+
+	if (!evsel->tp_sys)
+		tp_format = trace_event__tp_format_id(evsel->core.attr.config);
+	else
+		tp_format = trace_event__tp_format(evsel->tp_sys, evsel->tp_name);
+
+	if (IS_ERR(tp_format)) {
+		int err = -PTR_ERR(tp_format);
+
+		errno = err;
+		pr_err("Error getting tracepoint format '%s': %m\n",
+			evsel__name(evsel));
+		return NULL;
+	}
+	evsel->tp_format = tp_format;
+	return evsel->tp_format;
+}
+#endif
+
+const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = {
+	"cycles",
+	"instructions",
+	"cache-references",
+	"cache-misses",
+	"branches",
+	"branch-misses",
+	"bus-cycles",
+	"stalled-cycles-frontend",
+	"stalled-cycles-backend",
+	"ref-cycles",
+};
+
+char *evsel__bpf_counter_events;
+
+bool evsel__match_bpf_counter_events(const char *name)
+{
+	int name_len;
+	bool match;
+	char *ptr;
+
+	if (!evsel__bpf_counter_events)
+		return false;
+
+	ptr = strstr(evsel__bpf_counter_events, name);
+	name_len = strlen(name);
+
+	/* check name matches a full token in evsel__bpf_counter_events */
+	match = (ptr != NULL) &&
+		((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
+		((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
+
+	return match;
+}
+
+static const char *__evsel__hw_name(u64 config)
+{
+	if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
+		return evsel__hw_names[config];
+
+	return "unknown-hardware";
+}
+
+static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
+{
+	int colon = 0, r = 0;
+	struct perf_event_attr *attr = &evsel->core.attr;
+
+#define MOD_PRINT(context, mod)	do {					\
+		if (!attr->exclude_##context) {				\
+			if (!colon) colon = ++r;			\
+			r += scnprintf(bf + r, size - r, "%c", mod);	\
+		} } while(0)
+
+	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
+		MOD_PRINT(kernel, 'k');
+		MOD_PRINT(user, 'u');
+		MOD_PRINT(hv, 'h');
+	}
+
+	if (attr->precise_ip) {
+		if (!colon)
+			colon = ++r;
+		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
+	}
+
+	if (attr->exclude_host || attr->exclude_guest) {
+		MOD_PRINT(host, 'H');
+		MOD_PRINT(guest, 'G');
+	}
+#undef MOD_PRINT
+	if (colon)
+		bf[colon - 1] = ':';
+	return r;
+}
+
+int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
+{
+	return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
+}
+
+static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
+{
+	int r = arch_evsel__hw_name(evsel, bf, size);
+	return r + evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = {
+	"cpu-clock",
+	"task-clock",
+	"page-faults",
+	"context-switches",
+	"cpu-migrations",
+	"minor-faults",
+	"major-faults",
+	"alignment-faults",
+	"emulation-faults",
+	"dummy",
+};
+
+static const char *__evsel__sw_name(u64 config)
+{
+	if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
+		return evsel__sw_names[config];
+	return "unknown-software";
+}
+
+static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
+{
+	int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
+	return r + evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
+{
+	int r;
+
+	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
+
+	if (type & HW_BREAKPOINT_R)
+		r += scnprintf(bf + r, size - r, "r");
+
+	if (type & HW_BREAKPOINT_W)
+		r += scnprintf(bf + r, size - r, "w");
+
+	if (type & HW_BREAKPOINT_X)
+		r += scnprintf(bf + r, size - r, "x");
+
+	return r;
+}
+
+static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
+{
+	struct perf_event_attr *attr = &evsel->core.attr;
+	int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
+	return r + evsel__add_modifiers(evsel, bf + r, size - r);
+}
+
+const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
+ { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
+ { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
+ { "LLC",	"L2",							},
+ { "dTLB",	"d-tlb",	"Data-TLB",				},
+ { "iTLB",	"i-tlb",	"Instruction-TLB",			},
+ { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
+ { "node",								},
+};
+
+const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
+ { "load",	"loads",	"read",					},
+ { "store",	"stores",	"write",				},
+ { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
+};
+
+const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
+ { "refs",	"Reference",	"ops",		"access",		},
+ { "misses",	"miss",							},
+};
+
+#define C(x)		PERF_COUNT_HW_CACHE_##x
+#define CACHE_READ	(1 << C(OP_READ))
+#define CACHE_WRITE	(1 << C(OP_WRITE))
+#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
+#define COP(x)		(1 << x)
+
+/*
+ * cache operation stat
+ * L1I : Read and prefetch only
+ * ITLB and BPU : Read-only
+ */
+static const unsigned long evsel__hw_cache_stat[C(MAX)] = {
+ [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
+ [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(ITLB)]	= (CACHE_READ),
+ [C(BPU)]	= (CACHE_READ),
+ [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+};
+
+bool evsel__is_cache_op_valid(u8 type, u8 op)
+{
+	if (evsel__hw_cache_stat[type] & COP(op))
+		return true;	/* valid */
+	else
+		return false;	/* invalid */
+}
+
+int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
+{
+	if (result) {
+		return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
+				 evsel__hw_cache_op[op][0],
+				 evsel__hw_cache_result[result][0]);
+	}
+
+	return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
+			 evsel__hw_cache_op[op][1]);
+}
+
+static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
+{
+	u8 op, result, type = (config >>  0) & 0xff;
+	const char *err = "unknown-ext-hardware-cache-type";
+
+	if (type >= PERF_COUNT_HW_CACHE_MAX)
+		goto out_err;
+
+	op = (config >>  8) & 0xff;
+	err = "unknown-ext-hardware-cache-op";
+	if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
+		goto out_err;
+
+	result = (config >> 16) & 0xff;
+	err = "unknown-ext-hardware-cache-result";
+	if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+		goto out_err;
+
+	err = "invalid-cache";
+	if (!evsel__is_cache_op_valid(type, op))
+		goto out_err;
+
+	return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
+out_err:
+	return scnprintf(bf, size, "%s", err);
+}
+
+static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
+{
+	int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
+	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
+}
+
+static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
+{
+	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
+	return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
+}
+
+const char *evsel__name(struct evsel *evsel)
+{
+	char bf[128];
+
+	if (!evsel)
+		goto out_unknown;
+
+	if (evsel->name)
+		return evsel->name;
+
+	switch (evsel->core.attr.type) {
+	case PERF_TYPE_RAW:
+		evsel__raw_name(evsel, bf, sizeof(bf));
+		break;
+
+	case PERF_TYPE_HARDWARE:
+		evsel__hw_name(evsel, bf, sizeof(bf));
+		break;
+
+	case PERF_TYPE_HW_CACHE:
+		evsel__hw_cache_name(evsel, bf, sizeof(bf));
+		break;
+
+	case PERF_TYPE_SOFTWARE:
+		evsel__sw_name(evsel, bf, sizeof(bf));
+		break;
+
+	case PERF_TYPE_TRACEPOINT:
+		scnprintf(bf, sizeof(bf), "unknown tracepoint id=%#"PRIx64,
+			  evsel->core.attr.config);
+		break;
+
+	case PERF_TYPE_BREAKPOINT:
+		evsel__bp_name(evsel, bf, sizeof(bf));
+		break;
+
+	case PERF_PMU_TYPE_TOOL:
+		scnprintf(bf, sizeof(bf), "%s", evsel__tool_pmu_event_name(evsel));
+		break;
+
+	default:
+		scnprintf(bf, sizeof(bf), "unknown event PMU=%d config=%#"PRIx64,
+			  evsel->core.attr.type, evsel->core.attr.config);
+		break;
+	}
+
+	evsel->name = strdup(bf);
+
+	if (evsel->name)
+		return evsel->name;
+out_unknown:
+	return "unknown";
+}
+
+bool evsel__name_is(struct evsel *evsel, const char *name)
+{
+	return !strcmp(evsel__name(evsel), name);
+}
+
+const char *evsel__metric_id(const struct evsel *evsel)
+{
+	if (evsel->metric_id)
+		return evsel->metric_id;
+
+	if (evsel__is_tool(evsel))
+		return evsel__tool_pmu_event_name(evsel);
+
+	return "unknown";
+}
+
+const char *evsel__group_name(struct evsel *evsel)
+{
+	return evsel->group_name ?: "anon group";
+}
+
+/*
+ * Returns the group details for the specified leader,
+ * with following rules.
+ *
+ *  For record -e '{cycles,instructions}'
+ *    'anon group { cycles:u, instructions:u }'
+ *
+ *  For record -e 'cycles,instructions' and report --group
+ *    'cycles:u, instructions:u'
+ */
+int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
+{
+	int ret = 0;
+	bool first = true;
+	struct evsel *pos;
+	const char *group_name = evsel__group_name(evsel);
+
+	if (!evsel->forced_leader)
+		ret = scnprintf(buf, size, "%s { ", group_name);
+
+	for_each_group_evsel(pos, evsel) {
+		if (symbol_conf.skip_empty &&
+		    evsel__hists(pos)->stats.nr_samples == 0)
+			continue;
+
+		ret += scnprintf(buf + ret, size - ret, "%s%s",
+				 first ? "" : ", ", evsel__name(pos));
+		first = false;
+	}
+
+	if (!evsel->forced_leader)
+		ret += scnprintf(buf + ret, size - ret, " }");
+
+	return ret;
+}
+
+uint16_t evsel__e_machine(struct evsel *evsel, uint32_t *e_flags)
+{
+	struct perf_session *session = evsel__session(evsel);
+
+	return perf_session__e_machine(session, e_flags);
+}
+
+static void __evsel__config_callchain(struct evsel *evsel, const struct record_opts *opts,
+				      const struct callchain_param *param)
+{
+	bool function = evsel__is_function_event(evsel);
+	struct perf_event_attr *attr = &evsel->core.attr;
+
+	if (EM_HOST == EM_S390 && param->record_mode == CALLCHAIN_FP) {
+		pr_warning_once(
+			"Framepointer unwinding lacks kernel support. Use '--call-graph dwarf'\n");
+	}
+
+	evsel__set_sample_bit(evsel, CALLCHAIN);
+
+	attr->sample_max_stack = param->max_stack;
+
+	if (opts->kernel_callchains)
+		attr->exclude_callchain_user = 1;
+	if (opts->user_callchains)
+		attr->exclude_callchain_kernel = 1;
+	if (param->record_mode == CALLCHAIN_LBR) {
+		if (!opts->branch_stack) {
+			if (attr->exclude_user) {
+				pr_warning("LBR callstack option is only available "
+					   "to get user callchain information. "
+					   "Falling back to framepointers.\n");
+			} else {
+				evsel__set_sample_bit(evsel, BRANCH_STACK);
+				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
+							PERF_SAMPLE_BRANCH_CALL_STACK |
+							PERF_SAMPLE_BRANCH_NO_CYCLES |
+							PERF_SAMPLE_BRANCH_NO_FLAGS |
+							PERF_SAMPLE_BRANCH_HW_INDEX;
+			}
+		} else
+			 pr_warning("Cannot use LBR callstack with branch stack. "
+				    "Falling back to framepointers.\n");
+	}
+
+	if (param->record_mode == CALLCHAIN_DWARF) {
+		if (!function) {
+			uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL);
+
+			evsel__set_sample_bit(evsel, REGS_USER);
+			evsel__set_sample_bit(evsel, STACK_USER);
+			if (opts->sample_user_regs &&
+			    DWARF_MINIMAL_REGS(e_machine) != perf_user_reg_mask(EM_HOST)) {
+				attr->sample_regs_user |= DWARF_MINIMAL_REGS(e_machine);
+				pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
+					   "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
+					   "so the minimal registers set (IP, SP) is explicitly forced.\n");
+			} else {
+				attr->sample_regs_user |= perf_user_reg_mask(EM_HOST);
+			}
+			attr->sample_stack_user = param->dump_size;
+			attr->exclude_callchain_user = 1;
+		} else {
+			pr_info("Cannot use DWARF unwind for function trace event,"
+				" falling back to framepointers.\n");
+		}
+	}
+
+	if (function) {
+		pr_info("Disabling user space callchains for function trace event.\n");
+		attr->exclude_callchain_user = 1;
+	}
+
+	if (param->defer && !attr->exclude_callchain_user)
+		attr->defer_callchain = 1;
+}
+
+void evsel__config_callchain(struct evsel *evsel, const struct record_opts *opts,
+			     const struct callchain_param *param)
+{
+	if (param->enabled)
+		return __evsel__config_callchain(evsel, opts, param);
+}
+
+static void evsel__reset_callgraph(struct evsel *evsel, const struct callchain_param *param)
+{
+	struct perf_event_attr *attr = &evsel->core.attr;
+
+	evsel__reset_sample_bit(evsel, CALLCHAIN);
+	if (param->record_mode == CALLCHAIN_LBR) {
+		evsel__reset_sample_bit(evsel, BRANCH_STACK);
+		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
+					      PERF_SAMPLE_BRANCH_CALL_STACK |
+					      PERF_SAMPLE_BRANCH_HW_INDEX);
+	}
+	if (param->record_mode == CALLCHAIN_DWARF) {
+		evsel__reset_sample_bit(evsel, REGS_USER);
+		evsel__reset_sample_bit(evsel, STACK_USER);
+	}
+}
+
+static void evsel__apply_ratio_to_prev(struct evsel *evsel,
+				       struct perf_event_attr *attr,
+				       const struct record_opts *opts,
+				       const char *buf)
+{
+	struct perf_event_attr *prev_attr = NULL;
+	struct evsel *evsel_prev = NULL;
+	u64 type = evsel->core.attr.sample_type;
+	u64 prev_type = 0;
+	double rtp;
+
+	rtp = strtod(buf, NULL);
+	if (rtp <= 0) {
+		pr_err("Invalid ratio-to-prev value %lf\n", rtp);
+		return;
+	}
+	if (evsel == evsel__leader(evsel)) {
+		pr_err("Invalid use of ratio-to-prev term without preceding element in group\n");
+		return;
+	}
+	if (!evsel->pmu->is_core) {
+		pr_err("Event using ratio-to-prev term must have a core PMU\n");
+		return;
+	}
+
+	evsel_prev = evsel__prev(evsel);
+	if (!evsel_prev) {
+		pr_err("Previous event does not exist.\n");
+		return;
+	}
+
+	if (evsel_prev->pmu->type != evsel->pmu->type) {
+		pr_err("Compared events (\"%s\", \"%s\") must have same PMU\n",
+			evsel->name, evsel_prev->name);
+		return;
+	}
+
+	prev_attr = &evsel_prev->core.attr;
+	prev_type = evsel_prev->core.attr.sample_type;
+
+	if (!(prev_type & PERF_SAMPLE_PERIOD)) {
+		attr->sample_period = prev_attr->sample_period * rtp;
+		attr->freq = 0;
+		evsel__reset_sample_bit(evsel, PERIOD);
+	} else if (!(type & PERF_SAMPLE_PERIOD)) {
+		prev_attr->sample_period = attr->sample_period / rtp;
+		prev_attr->freq = 0;
+		evsel__reset_sample_bit(evsel_prev, PERIOD);
+	} else {
+		if (opts->user_interval != ULLONG_MAX) {
+			prev_attr->sample_period = opts->user_interval;
+			attr->sample_period = prev_attr->sample_period * rtp;
+			prev_attr->freq = 0;
+			attr->freq = 0;
+			evsel__reset_sample_bit(evsel_prev, PERIOD);
+			evsel__reset_sample_bit(evsel, PERIOD);
+		} else {
+			pr_err("Event period term or count (-c) must be set when using ratio-to-prev term.\n");
+			return;
+		}
+	}
+
+	arch_evsel__apply_ratio_to_prev(evsel, attr);
+}
+
+static void evsel__apply_config_terms(struct evsel *evsel,
+				      const struct record_opts *opts, bool track)
+{
+	struct evsel_config_term *term;
+	struct list_head *config_terms = &evsel->config_terms;
+	struct perf_event_attr *attr = &evsel->core.attr;
+	/* callgraph default */
+	struct callchain_param param = {
+		.record_mode = callchain_param.record_mode,
+	};
+	u32 dump_size = 0;
+	int max_stack = 0;
+	const char *callgraph_buf = NULL;
+	const char *rtp_buf = NULL;
+
+	list_for_each_entry(term, config_terms, list) {
+		switch (term->type) {
+		case EVSEL__CONFIG_TERM_PERIOD:
+			if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
+				attr->sample_period = term->val.period;
+				attr->freq = 0;
+				evsel__reset_sample_bit(evsel, PERIOD);
+			}
+			break;
+		case EVSEL__CONFIG_TERM_FREQ:
+			if (!(term->weak && opts->user_freq != UINT_MAX)) {
+				attr->sample_freq = term->val.freq;
+				attr->freq = 1;
+				evsel__set_sample_bit(evsel, PERIOD);
+			}
+			break;
+		case EVSEL__CONFIG_TERM_TIME:
+			if (term->val.time)
+				evsel__set_sample_bit(evsel, TIME);
+			else
+				evsel__reset_sample_bit(evsel, TIME);
+			break;
+		case EVSEL__CONFIG_TERM_CALLGRAPH:
+			callgraph_buf = term->val.str;
+			break;
+		case EVSEL__CONFIG_TERM_BRANCH:
+			if (term->val.str && strcmp(term->val.str, "no")) {
+				evsel__set_sample_bit(evsel, BRANCH_STACK);
+				parse_branch_str(term->val.str,
+						 &attr->branch_sample_type);
+			} else
+				evsel__reset_sample_bit(evsel, BRANCH_STACK);
+			break;
+		case EVSEL__CONFIG_TERM_STACK_USER:
+			dump_size = term->val.stack_user;
+			break;
+		case EVSEL__CONFIG_TERM_MAX_STACK:
+			max_stack = term->val.max_stack;
+			break;
+		case EVSEL__CONFIG_TERM_MAX_EVENTS:
+			evsel->max_events = term->val.max_events;
+			break;
+		case EVSEL__CONFIG_TERM_INHERIT:
+			/*
+			 * attr->inherit should has already been set by
+			 * evsel__config. If user explicitly set
+			 * inherit using config terms, override global
+			 * opt->no_inherit setting.
+			 */
+			attr->inherit = term->val.inherit ? 1 : 0;
+			break;
+		case EVSEL__CONFIG_TERM_OVERWRITE:
+			attr->write_backward = term->val.overwrite ? 1 : 0;
+			break;
+		case EVSEL__CONFIG_TERM_DRV_CFG:
+			break;
+		case EVSEL__CONFIG_TERM_PERCORE:
+			break;
+		case EVSEL__CONFIG_TERM_AUX_OUTPUT:
+			attr->aux_output = term->val.aux_output ? 1 : 0;
+			break;
+		case EVSEL__CONFIG_TERM_AUX_ACTION:
+			/* Already applied by auxtrace */
+			break;
+		case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
+			/* Already applied by auxtrace */
+			break;
+		case EVSEL__CONFIG_TERM_USR_CHG_CONFIG:
+		case EVSEL__CONFIG_TERM_USR_CHG_CONFIG1:
+		case EVSEL__CONFIG_TERM_USR_CHG_CONFIG2:
+		case EVSEL__CONFIG_TERM_USR_CHG_CONFIG3:
+		case EVSEL__CONFIG_TERM_USR_CHG_CONFIG4:
+			break;
+		case EVSEL__CONFIG_TERM_RATIO_TO_PREV:
+			rtp_buf = term->val.str;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* User explicitly set per-event callgraph, clear the old setting and reset. */
+	if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
+		bool sample_address = false;
+
+		if (max_stack) {
+			param.max_stack = max_stack;
+			if (callgraph_buf == NULL)
+				callgraph_buf = "fp";
+		}
+
+		/* parse callgraph parameters */
+		if (callgraph_buf != NULL) {
+			if (!strcmp(callgraph_buf, "no")) {
+				param.enabled = false;
+				param.record_mode = CALLCHAIN_NONE;
+			} else {
+				param.enabled = true;
+				if (parse_callchain_record(callgraph_buf, &param)) {
+					pr_err("per-event callgraph setting for %s failed. "
+					       "Apply callgraph global setting for it\n",
+					       evsel->name);
+					return;
+				}
+				if (param.record_mode == CALLCHAIN_DWARF)
+					sample_address = true;
+			}
+		}
+		if (dump_size > 0) {
+			dump_size = round_up(dump_size, sizeof(u64));
+			param.dump_size = dump_size;
+		}
+
+		/* If global callgraph set, clear it */
+		if (callchain_param.enabled)
+			evsel__reset_callgraph(evsel, &callchain_param);
+
+		/* set perf-event callgraph */
+		if (param.enabled) {
+			if (sample_address) {
+				evsel__set_sample_bit(evsel, ADDR);
+				evsel__set_sample_bit(evsel, DATA_SRC);
+				evsel->core.attr.mmap_data = track;
+			}
+			evsel__config_callchain(evsel, opts, &param);
+		}
+	}
+	if (rtp_buf)
+		evsel__apply_ratio_to_prev(evsel, attr, opts, rtp_buf);
+}
+
+struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
+{
+	struct evsel_config_term *term, *found_term = NULL;
+
+	list_for_each_entry(term, &evsel->config_terms, list) {
+		if (term->type == type)
+			found_term = term;
+	}
+
+	return found_term;
+}
+
+/*
+ * Set @config_name to @val as long as the user hasn't already set or cleared it
+ * by passing a config term on the command line.
+ *
+ * @val is the value to put into the bits specified by @config_name rather than
+ * the bit pattern. It is shifted into position by this function, so to set
+ * something to true, pass 1 for val rather than a pre shifted value.
+ */
+void evsel__set_config_if_unset(struct evsel *evsel, const char *config_name,
+				u64 val)
+{
+	u64 user_bits = 0;
+	struct evsel_config_term *term = evsel__get_config_term(evsel,
+								USR_CHG_CONFIG);
+	struct perf_pmu_format *format = pmu_find_format(&evsel->pmu->format,
+							 config_name);
+	int fbit;
+	__u64 *vp;
+
+	if (!format)
+		return;
+
+	switch (format->value) {
+	case PERF_PMU_FORMAT_VALUE_CONFIG:
+		term = evsel__get_config_term(evsel, USR_CHG_CONFIG);
+		vp = &evsel->core.attr.config;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG1:
+		term = evsel__get_config_term(evsel, USR_CHG_CONFIG1);
+		vp = &evsel->core.attr.config1;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG2:
+		term = evsel__get_config_term(evsel, USR_CHG_CONFIG2);
+		vp = &evsel->core.attr.config2;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG3:
+		term = evsel__get_config_term(evsel, USR_CHG_CONFIG3);
+		vp = &evsel->core.attr.config3;
+		break;
+	case PERF_PMU_FORMAT_VALUE_CONFIG4:
+		term = evsel__get_config_term(evsel, USR_CHG_CONFIG4);
+		vp = &evsel->core.attr.config4;
+		break;
+	default:
+		pr_err("Unknown format value: %d\n", format->value);
+		return;
+	}
+
+	if (!format)
+		return;
+
+	if (term)
+		user_bits = term->val.cfg_chg;
+
+	/* Do nothing if the user changed the value */
+	for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
+		if ((1ULL << fbit) & user_bits)
+			return;
+
+	/* Otherwise replace it */
+	perf_pmu__format_pack(format->bits, val, vp, /*zero=*/true);
+}
+
+bool evsel__config_exists(const struct evsel *evsel, const char *config_name)
+{
+	struct perf_pmu_format *format = pmu_find_format(&evsel->pmu->format, config_name);
+
+	return format && !bitmap_empty(format->bits, PERF_PMU_FORMAT_BITS);
+}
+
+int evsel__get_config_val(const struct evsel *evsel, const char *config_name,
+			  u64 *val)
+{
+	struct perf_pmu_format *format = pmu_find_format(&evsel->pmu->format, config_name);
+
+	if (!format || bitmap_empty(format->bits, PERF_PMU_FORMAT_BITS)) {
+		pr_err("Unknown/empty format name: %s\n", config_name);
+		*val = 0;
+		return -EINVAL;
+	}
+
+	switch (format->value) {
+	case PERF_PMU_FORMAT_VALUE_CONFIG:
+		*val = perf_pmu__format_unpack(format->bits,
+					       evsel->core.attr.config);
+		return 0;
+	case PERF_PMU_FORMAT_VALUE_CONFIG1:
+		*val = perf_pmu__format_unpack(format->bits,
+					       evsel->core.attr.config1);
+		return 0;
+	case PERF_PMU_FORMAT_VALUE_CONFIG2:
+		*val = perf_pmu__format_unpack(format->bits,
+					       evsel->core.attr.config2);
+		return 0;
+	case PERF_PMU_FORMAT_VALUE_CONFIG3:
+		*val = perf_pmu__format_unpack(format->bits,
+					       evsel->core.attr.config3);
+		return 0;
+	case PERF_PMU_FORMAT_VALUE_CONFIG4:
+		*val = perf_pmu__format_unpack(format->bits,
+					       evsel->core.attr.config4);
+		return 0;
+	default:
+		pr_err("Unknown format value: %d\n", format->value);
+		*val = 0;
+		return -EINVAL;
+	}
+}
+
+void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
+{
+	evsel__set_sample_bit(evsel, WEIGHT);
+}
+
+void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
+				    struct perf_event_attr *attr __maybe_unused)
+{
+}
+
+void __weak arch_evsel__apply_ratio_to_prev(struct evsel *evsel __maybe_unused,
+					    struct perf_event_attr *attr __maybe_unused)
+{
+}
+
+static void evsel__set_default_freq_period(const struct record_opts *opts,
+					   struct perf_event_attr *attr)
+{
+	if (opts->freq) {
+		attr->freq = 1;
+		attr->sample_freq = opts->freq;
+	} else {
+		attr->sample_period = opts->default_interval;
+	}
+}
+
+bool evsel__is_offcpu_event(struct evsel *evsel)
+{
+	return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT) &&
+	       evsel->core.attr.sample_type & PERF_SAMPLE_RAW;
+}
+
+/*
+ * The enable_on_exec/disabled value strategy:
+ *
+ *  1) For any type of traced program:
+ *    - all independent events and group leaders are disabled
+ *    - all group members are enabled
+ *
+ *     Group members are ruled by group leaders. They need to
+ *     be enabled, because the group scheduling relies on that.
+ *
+ *  2) For traced programs executed by perf:
+ *     - all independent events and group leaders have
+ *       enable_on_exec set
+ *     - we don't specifically enable or disable any event during
+ *       the record command
+ *
+ *     Independent events and group leaders are initially disabled
+ *     and get enabled by exec. Group members are ruled by group
+ *     leaders as stated in 1).
+ *
+ *  3) For traced programs attached by perf (pid/tid):
+ *     - we specifically enable or disable all events during
+ *       the record command
+ *
+ *     When attaching events to already running traced we
+ *     enable/disable events specifically, as there's no
+ *     initial traced exec call.
+ */
+void evsel__config(struct evsel *evsel, const struct record_opts *opts,
+		   const struct callchain_param *callchain)
+{
+	struct evsel *leader = evsel__leader(evsel);
+	struct perf_event_attr *attr = &evsel->core.attr;
+	int track = evsel->tracking;
+	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
+
+	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
+	attr->inherit	    = target__has_cpu(&opts->target) ? 0 : !opts->no_inherit;
+	attr->write_backward = opts->overwrite ? 1 : 0;
+	attr->read_format   = PERF_FORMAT_LOST;
+
+	evsel__set_sample_bit(evsel, IP);
+	evsel__set_sample_bit(evsel, TID);
+
+	if (evsel->sample_read) {
+		evsel__set_sample_bit(evsel, READ);
+
+		/*
+		 * We need ID even in case of single event, because
+		 * PERF_SAMPLE_READ process ID specific data.
+		 */
+		evsel__set_sample_id(evsel, false);
+
+		/*
+		 * Apply group format only if we belong to group
+		 * with more than one members.
+		 */
+		if (leader->core.nr_members > 1) {
+			attr->read_format |= PERF_FORMAT_GROUP;
+		}
+
+		/*
+		 * Inherit + SAMPLE_READ requires SAMPLE_TID in the read_format
+		 */
+		if (attr->inherit) {
+			evsel__set_sample_bit(evsel, TID);
+			evsel->core.attr.read_format |=
+				PERF_FORMAT_ID;
+		}
+	}
+
+	/*
+	 * We default some events to have a default interval. But keep
+	 * it a weak assumption overridable by the user.
+	 */
+	if ((evsel->is_libpfm_event && !attr->sample_period) ||
+	    (!evsel->is_libpfm_event && (!attr->sample_period ||
+					 opts->user_freq != UINT_MAX ||
+					 opts->user_interval != ULLONG_MAX)))
+		evsel__set_default_freq_period(opts, attr);
+
+	/*
+	 * If attr->freq was set (here or earlier), ask for period
+	 * to be sampled.
+	 */
+	if (attr->freq)
+		evsel__set_sample_bit(evsel, PERIOD);
+
+	if (opts->no_samples)
+		attr->sample_freq = 0;
+
+	if (opts->inherit_stat) {
+		evsel->core.attr.read_format |=
+			PERF_FORMAT_TOTAL_TIME_ENABLED |
+			PERF_FORMAT_TOTAL_TIME_RUNNING |
+			PERF_FORMAT_ID;
+		attr->inherit_stat = 1;
+	}
+
+	if (opts->sample_address)
+		evsel__set_sample_bit(evsel, ADDR);
+
+	if (opts->record_data_mmap)
+		attr->mmap_data = track;
+
+	/*
+	 * We don't allow user space callchains for  function trace
+	 * event, due to issues with page faults while tracing page
+	 * fault handler and its overall trickiness nature.
+	 */
+	if (evsel__is_function_event(evsel))
+		evsel->core.attr.exclude_callchain_user = 1;
+
+	if (callchain && callchain->enabled && !evsel->no_aux_samples)
+		evsel__config_callchain(evsel, opts, callchain);
+
+	if (opts->sample_intr_regs && !evsel->no_aux_samples &&
+	    !evsel__is_dummy_event(evsel)) {
+		attr->sample_regs_intr = opts->sample_intr_regs;
+		evsel__set_sample_bit(evsel, REGS_INTR);
+	}
+
+	if (opts->sample_user_regs && !evsel->no_aux_samples &&
+	    !evsel__is_dummy_event(evsel)) {
+		attr->sample_regs_user |= opts->sample_user_regs;
+		evsel__set_sample_bit(evsel, REGS_USER);
+	}
+
+	if (target__has_cpu(&opts->target) || opts->sample_cpu)
+		evsel__set_sample_bit(evsel, CPU);
+
+	/*
+	 * When the user explicitly disabled time don't force it here.
+	 */
+	if (opts->sample_time &&
+	    (!perf_missing_features.sample_id_all &&
+	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
+	     opts->sample_time_set)))
+		evsel__set_sample_bit(evsel, TIME);
+
+	if (opts->raw_samples && !evsel->no_aux_samples) {
+		evsel__set_sample_bit(evsel, TIME);
+		evsel__set_sample_bit(evsel, RAW);
+		evsel__set_sample_bit(evsel, CPU);
+	}
+
+	if (opts->sample_data_src)
+		evsel__set_sample_bit(evsel, DATA_SRC);
+
+	if (opts->sample_phys_addr)
+		evsel__set_sample_bit(evsel, PHYS_ADDR);
+
+	if (opts->no_buffering) {
+		attr->watermark = 0;
+		attr->wakeup_events = 1;
+	}
+	if (opts->branch_stack && !evsel->no_aux_samples) {
+		evsel__set_sample_bit(evsel, BRANCH_STACK);
+		attr->branch_sample_type = opts->branch_stack;
+	}
+
+	if (opts->sample_weight || evsel->retire_lat) {
+		arch_evsel__set_sample_weight(evsel);
+		evsel->retire_lat = false;
+	}
+	attr->task     = track;
+	attr->mmap     = track;
+	attr->mmap2    = track && !perf_missing_features.mmap2;
+	attr->comm     = track;
+	attr->build_id = track && opts->build_id;
+	attr->defer_output = track && callchain && callchain->defer;
+
+	/*
+	 * ksymbol is tracked separately with text poke because it needs to be
+	 * system wide and enabled immediately.
+	 */
+	if (!opts->text_poke)
+		attr->ksymbol = track && !perf_missing_features.ksymbol;
+	attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
+
+	if (opts->record_namespaces)
+		attr->namespaces  = track;
+
+	if (opts->record_cgroup) {
+		attr->cgroup = track && !perf_missing_features.cgroup;
+		evsel__set_sample_bit(evsel, CGROUP);
+	}
+
+	if (opts->sample_data_page_size)
+		evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
+
+	if (opts->sample_code_page_size)
+		evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
+
+	if (opts->record_switch_events)
+		attr->context_switch = track;
+
+	if (opts->sample_transaction)
+		evsel__set_sample_bit(evsel, TRANSACTION);
+
+	if (opts->running_time) {
+		evsel->core.attr.read_format |=
+			PERF_FORMAT_TOTAL_TIME_ENABLED |
+			PERF_FORMAT_TOTAL_TIME_RUNNING;
+	}
+
+	/*
+	 * XXX see the function comment above
+	 *
+	 * Disabling only independent events or group leaders,
+	 * keeping group members enabled.
+	 */
+	if (evsel__is_group_leader(evsel))
+		attr->disabled = 1;
+
+	/*
+	 * Setting enable_on_exec for independent events and
+	 * group leaders for traced executed by perf.
+	 */
+	if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
+	    !opts->target.initial_delay)
+		attr->enable_on_exec = 1;
+
+	if (evsel->immediate) {
+		attr->disabled = 0;
+		attr->enable_on_exec = 0;
+	}
+
+	clockid = opts->clockid;
+	if (opts->use_clockid) {
+		attr->use_clockid = 1;
+		attr->clockid = opts->clockid;
+	}
+
+	if (evsel->precise_max)
+		attr->precise_ip = 3;
+
+	if (opts->all_user) {
+		attr->exclude_kernel = 1;
+		attr->exclude_user   = 0;
+	}
+
+	if (opts->all_kernel) {
+		attr->exclude_kernel = 0;
+		attr->exclude_user   = 1;
+	}
+
+	if (evsel->core.pmu_cpus || evsel->unit)
+		evsel->core.attr.read_format |= PERF_FORMAT_ID;
+
+	/*
+	 * Apply event specific term settings,
+	 * it overloads any global configuration.
+	 */
+	evsel__apply_config_terms(evsel, opts, track);
+
+	evsel->ignore_missing_thread = opts->ignore_missing_thread;
+
+	/* The --period option takes the precedence. */
+	if (opts->period_set) {
+		if (opts->period)
+			evsel__set_sample_bit(evsel, PERIOD);
+		else
+			evsel__reset_sample_bit(evsel, PERIOD);
+	}
+
+	/*
+	 * A dummy event never triggers any actual counter and therefore
+	 * cannot be used with branch_stack.
+	 *
+	 * For initial_delay, a dummy event is added implicitly.
+	 * The software event will trigger -EOPNOTSUPP error out,
+	 * if BRANCH_STACK bit is set.
+	 */
+	if (evsel__is_dummy_event(evsel))
+		evsel__reset_sample_bit(evsel, BRANCH_STACK);
+
+	if (evsel__is_offcpu_event(evsel)) {
+		evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES;
+		attr->inherit = 0;
+	}
+
+	arch__post_evsel_config(evsel, attr);
+}
+
+int evsel__set_filter(struct evsel *evsel, const char *filter)
+{
+	char *new_filter = strdup(filter);
+
+	if (new_filter != NULL) {
+		free(evsel->filter);
+		evsel->filter = new_filter;
+		return 0;
+	}
+
+	return -1;
+}
+
+static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
+{
+	char *new_filter;
+
+	if (evsel->filter == NULL)
+		return evsel__set_filter(evsel, filter);
+
+	if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
+		free(evsel->filter);
+		evsel->filter = new_filter;
+		return 0;
+	}
+
+	return -1;
+}
+
+int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
+{
+	return evsel__append_filter(evsel, "(%s) && (%s)", filter);
+}
+
+int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
+{
+	return evsel__append_filter(evsel, "%s,%s", filter);
+}
+
+/* Caller has to clear disabled after going through all CPUs. */
+int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx)
+{
+	int err;
+
+	if (evsel__is_tool(evsel))
+		err = evsel__tool_pmu_enable_cpu(evsel, cpu_map_idx);
+	else
+		err = perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
+
+	if (!err && evsel__is_group_leader(evsel)) {
+		struct evsel *member;
+
+		for_each_group_member(member, evsel) {
+			if (evsel__is_non_perf_event_open_pmu(evsel) ||
+			    evsel__is_non_perf_event_open_pmu(member)) {
+				/*
+				 * In a mixed PMU group, userspace PMUs are not
+				 * grouped in the kernel (opened with group_fd = -1)
+				 * and are skipped by the kernel when enabling the
+				 * group leader. We must manually enable them in
+				 * userspace.
+				 */
+				int mem_err = evsel__enable_cpu(member, cpu_map_idx);
+
+				if (mem_err)
+					return mem_err;
+			}
+		}
+	}
+	return err;
+}
+
+int evsel__enable(struct evsel *evsel)
+{
+	int err;
+
+	if (evsel__is_tool(evsel))
+		err = evsel__tool_pmu_enable(evsel);
+	else
+		err = perf_evsel__enable(&evsel->core);
+
+	if (!err)
+		evsel->disabled = false;
+
+	if (!err && evsel__is_group_leader(evsel)) {
+		struct evsel *member;
+
+		for_each_group_member(member, evsel) {
+			if (evsel__is_non_perf_event_open_pmu(evsel) ||
+			    evsel__is_non_perf_event_open_pmu(member)) {
+				/*
+				 * In a mixed PMU group, userspace PMUs are not
+				 * grouped in the kernel (opened with group_fd = -1)
+				 * and are skipped by the kernel when enabling the
+				 * group leader. We must manually enable them in
+				 * userspace.
+				 */
+				int mem_err = evsel__enable(member);
+
+				if (mem_err)
+					return mem_err;
+			}
+			member->disabled = false;
+		}
+	}
+
+	return err;
+}
+
+/* Caller has to set disabled after going through all CPUs. */
+int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx)
+{
+	int err;
+
+	if (evsel__is_tool(evsel))
+		err = evsel__tool_pmu_disable_cpu(evsel, cpu_map_idx);
+	else
+		err = perf_evsel__disable_cpu(&evsel->core, cpu_map_idx);
+
+	if (!err && evsel__is_group_leader(evsel)) {
+		struct evsel *member;
+
+		for_each_group_member(member, evsel) {
+			if (evsel__is_non_perf_event_open_pmu(evsel) ||
+			    evsel__is_non_perf_event_open_pmu(member)) {
+				/*
+				 * In a mixed PMU group, userspace PMUs are not
+				 * grouped in the kernel and are skipped by the
+				 * kernel when disabling the group leader. We must
+				 * manually disable them in userspace.
+				 */
+				int mem_err = evsel__disable_cpu(member, cpu_map_idx);
+
+				if (mem_err)
+					return mem_err;
+			}
+		}
+	}
+	return err;
+}
+
+int evsel__disable(struct evsel *evsel)
+{
+	int err;
+
+	if (evsel__is_tool(evsel))
+		err = evsel__tool_pmu_disable(evsel);
+	else
+		err = perf_evsel__disable(&evsel->core);
+
+	/*
+	 * We mark it disabled here so that tools that disable a event can
+	 * ignore events after they disable it. I.e. the ring buffer may have
+	 * already a few more events queued up before the kernel got the stop
+	 * request.
+	 */
+	if (!err)
+		evsel->disabled = true;
+
+	if (!err && evsel__is_group_leader(evsel)) {
+		struct evsel *member;
+
+		for_each_group_member(member, evsel) {
+			if (evsel__is_non_perf_event_open_pmu(evsel) ||
+			    evsel__is_non_perf_event_open_pmu(member)) {
+				/*
+				 * In a mixed PMU group, userspace PMUs are not
+				 * grouped in the kernel and are skipped by the
+				 * kernel when disabling the group leader. We must
+				 * manually disable them in userspace.
+				 */
+				int mem_err = evsel__disable(member);
+
+				if (mem_err)
+					return mem_err;
+			}
+			member->disabled = true;
+		}
+	}
+
+	return err;
+}
+
+void free_config_terms(struct list_head *config_terms)
+{
+	struct evsel_config_term *term, *h;
+
+	list_for_each_entry_safe(term, h, config_terms, list) {
+		list_del_init(&term->list);
+		if (term->free_str)
+			zfree(&term->val.str);
+		free(term);
+	}
+}
+
+static void evsel__free_config_terms(struct evsel *evsel)
+{
+	free_config_terms(&evsel->config_terms);
+}
+
+static void (*evsel__priv_destructor)(void *priv);
+
+void evsel__set_priv_destructor(void (*destructor)(void *priv))
+{
+	assert(evsel__priv_destructor == NULL);
+
+	evsel__priv_destructor = destructor;
+}
+
+static void evsel__exit(struct evsel *evsel)
+{
+	assert(list_empty(&evsel->core.node));
+	assert(evsel->evlist == NULL);
+	if (evsel__is_retire_lat(evsel))
+		evsel__tpebs_close(evsel);
+	bpf_counter__destroy(evsel);
+	perf_bpf_filter__destroy(evsel);
+	evsel__free_counts(evsel);
+	perf_evsel__free_fd(&evsel->core);
+	perf_evsel__free_id(&evsel->core);
+	evsel__free_config_terms(evsel);
+	cgroup__put(evsel->cgrp);
+	perf_evsel__exit(&evsel->core);
+	zfree(&evsel->group_name);
+	zfree(&evsel->name);
+#ifdef HAVE_LIBTRACEEVENT
+	zfree(&evsel->tp_sys);
+	zfree(&evsel->tp_name);
+#endif
+	zfree(&evsel->filter);
+	zfree(&evsel->group_pmu_name);
+	zfree(&evsel->unit);
+	zfree(&evsel->metric_id);
+	evsel__zero_per_pkg(evsel);
+	hashmap__free(evsel->per_pkg_mask);
+	evsel->per_pkg_mask = NULL;
+	if (evsel__priv_destructor)
+		evsel__priv_destructor(evsel->priv);
+	perf_evsel__object.fini(evsel);
+	if (evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME ||
+	    evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME) {
+		xyarray__delete(evsel->process_time.start_times);
+		xyarray__delete(evsel->process_time.accumulated_times);
+	}
+}
+
+void evsel__put(struct evsel *evsel)
+{
+	if (!evsel)
+		return;
+
+	if (!refcount_dec_and_test(&evsel->refcnt))
+		return;
+
+	evsel__exit(evsel);
+	free(evsel);
+}
+
+void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread,
+			   struct perf_counts_values *count)
+{
+	struct perf_counts_values tmp;
+
+	if (!evsel->prev_raw_counts)
+		return;
+
+	tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
+	*perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count;
+
+	count->val = count->val - tmp.val;
+	count->ena = count->ena - tmp.ena;
+	count->run = count->run - tmp.run;
+}
+
+static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
+{
+	struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread);
+
+	return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
+}
+
+static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
+			     u64 val, u64 ena, u64 run, u64 lost)
+{
+	struct perf_counts_values *count;
+
+	count = perf_counts(counter->counts, cpu_map_idx, thread);
+
+	if (evsel__is_retire_lat(counter)) {
+		evsel__tpebs_read(counter, cpu_map_idx, thread);
+		perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
+		return;
+	}
+
+	count->val    = val;
+	count->ena    = ena;
+	count->run    = run;
+	count->lost   = lost;
+
+	perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
+}
+
+static bool evsel__group_has_tpebs(struct evsel *leader)
+{
+	struct evsel *evsel;
+
+	for_each_group_evsel(evsel, leader) {
+		if (evsel__is_retire_lat(evsel))
+			return true;
+	}
+	return false;
+}
+
+static u64 evsel__group_read_nr_members(struct evsel *leader)
+{
+	u64 nr = leader->core.nr_members;
+	struct evsel *evsel;
+
+	for_each_group_evsel(evsel, leader) {
+		if (evsel__is_retire_lat(evsel))
+			nr--;
+	}
+	return nr;
+}
+
+static u64 evsel__group_read_size(struct evsel *leader)
+{
+	u64 read_format = leader->core.attr.read_format;
+	int entry = sizeof(u64); /* value */
+	int size = 0;
+	int nr = 1;
+
+	if (!evsel__group_has_tpebs(leader))
+		return perf_evsel__read_size(&leader->core);
+
+	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+		size += sizeof(u64);
+
+	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+		size += sizeof(u64);
+
+	if (read_format & PERF_FORMAT_ID)
+		entry += sizeof(u64);
+
+	if (read_format & PERF_FORMAT_LOST)
+		entry += sizeof(u64);
+
+	if (read_format & PERF_FORMAT_GROUP) {
+		nr = evsel__group_read_nr_members(leader);
+		size += sizeof(u64);
+	}
+
+	size += entry * nr;
+	return size;
+}
+
+static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data)
+{
+	u64 read_format = leader->core.attr.read_format;
+	struct sample_read_value *v;
+	u64 nr, ena = 0, run = 0, lost = 0;
+
+	nr = *data++;
+
+	if (nr != evsel__group_read_nr_members(leader))
+		return -EINVAL;
+
+	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+		ena = *data++;
+
+	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+		run = *data++;
+
+	v = (void *)data;
+	sample_read_group__for_each(v, nr, read_format) {
+		struct evsel *counter;
+
+		counter = evlist__id2evsel(leader->evlist, v->id);
+		if (!counter)
+			return -EINVAL;
+
+		if (read_format & PERF_FORMAT_LOST)
+			lost = v->lost;
+
+		evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);
+	}
+
+	return 0;
+}
+
+static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread)
+{
+	struct perf_stat_evsel *ps = leader->stats;
+	u64 read_format = leader->core.attr.read_format;
+	int size = evsel__group_read_size(leader);
+	u64 *data = ps->group_data;
+
+	if (!(read_format & PERF_FORMAT_ID))
+		return -EINVAL;
+
+	if (!evsel__is_group_leader(leader))
+		return -EINVAL;
+
+	if (!data) {
+		data = zalloc(size);
+		if (!data)
+			return -ENOMEM;
+
+		ps->group_data = data;
+	}
+
+	if (FD(leader, cpu_map_idx, thread) < 0)
+		return -EINVAL;
+
+	if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0)
+		return -errno;
+
+	return evsel__process_group_data(leader, cpu_map_idx, thread, data);
+}
+
+bool __evsel__match(const struct evsel *evsel, u32 type, u64 config)
+{
+
+	u32 e_type = evsel->core.attr.type;
+	u64 e_config = evsel->core.attr.config;
+
+	if (e_type == type && e_config == config)
+		return true;
+	if (type != PERF_TYPE_HARDWARE && type != PERF_TYPE_HW_CACHE)
+		return false;
+	if ((e_type == PERF_TYPE_HARDWARE || e_type == PERF_TYPE_HW_CACHE) &&
+		perf_pmus__supports_extended_type())
+		e_config &= PERF_HW_EVENT_MASK;
+	if (e_type == type && e_config == config)
+		return true;
+	if (type == PERF_TYPE_HARDWARE && evsel->pmu && evsel->pmu->is_core &&
+	    evsel->alternate_hw_config == config)
+		return true;
+	return false;
+}
+
+int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
+{
+	if (evsel__is_tool(evsel))
+		return evsel__tool_pmu_read(evsel, cpu_map_idx, thread);
+
+	if (evsel__is_hwmon(evsel))
+		return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread);
+
+	if (evsel__is_drm(evsel))
+		return evsel__drm_pmu_read(evsel, cpu_map_idx, thread);
+
+	if (evsel__is_retire_lat(evsel))
+		return evsel__tpebs_read(evsel, cpu_map_idx, thread);
+
+	if (evsel->core.attr.read_format & PERF_FORMAT_GROUP)
+		return evsel__read_group(evsel, cpu_map_idx, thread);
+
+	return evsel__read_one(evsel, cpu_map_idx, thread);
+}
+
+int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale)
+{
+	struct perf_counts_values count;
+	size_t nv = scale ? 3 : 1;
+
+	if (FD(evsel, cpu_map_idx, thread) < 0)
+		return -EINVAL;
+
+	if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
+		return -ENOMEM;
+
+	if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0)
+		return -errno;
+
+	evsel__compute_deltas(evsel, cpu_map_idx, thread, &count);
+	perf_counts_values__scale(&count, scale, NULL);
+	*perf_counts(evsel->counts, cpu_map_idx, thread) = count;
+	return 0;
+}
+
+static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
+				  int cpu_map_idx)
+{
+	struct perf_cpu cpu;
+
+	cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
+	return perf_cpu_map__idx(other->core.cpus, cpu);
+}
+
+static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx)
+{
+	struct evsel *leader = evsel__leader(evsel);
+
+	if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
+	    (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
+		return evsel__match_other_cpu(evsel, leader, cpu_map_idx);
+	}
+
+	return cpu_map_idx;
+}
+
+static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread)
+{
+	struct evsel *leader = evsel__leader(evsel);
+	int fd;
+
+	if (!evsel->supported || evsel__is_group_leader(evsel))
+		return -1;
+
+	/*
+	 * Leader must be already processed/open,
+	 * if not it's a bug.
+	 */
+	BUG_ON(!leader->core.fd);
+
+	cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx);
+	if (cpu_map_idx == -1)
+		return -1;
+
+	fd = FD(leader, cpu_map_idx, thread);
+	BUG_ON(fd == -1 && leader->supported);
+
+	/*
+	 * When the leader has been skipped, return -2 to distinguish from no
+	 * group leader case.
+	 */
+	return fd == -1 ? -2 : fd;
+}
+
+static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
+{
+	for (int cpu = 0; cpu < nr_cpus; cpu++)
+		for (int thread = thread_idx; thread < nr_threads - 1; thread++)
+			FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
+}
+
+static int update_fds(struct evsel *evsel,
+		      int nr_cpus, int cpu_map_idx,
+		      int nr_threads, int thread_idx)
+{
+	struct evsel *pos;
+
+	if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads)
+		return -EINVAL;
+
+	evlist__for_each_entry(evsel->evlist, pos) {
+		nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx;
+
+		evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
+
+		/*
+		 * Since fds for next evsel has not been created,
+		 * there is no need to iterate whole event list.
+		 */
+		if (pos == evsel)
+			break;
+	}
+	return 0;
+}
+
+static bool evsel__ignore_missing_thread(struct evsel *evsel,
+					 int nr_cpus, int cpu_map_idx,
+					 struct perf_thread_map *threads,
+					 int thread, int err)
+{
+	pid_t ignore_pid = perf_thread_map__pid(threads, thread);
+
+	if (!evsel->ignore_missing_thread)
+		return false;
+
+	/* The system wide setup does not work with threads. */
+	if (evsel->core.system_wide)
+		return false;
+
+	/* The -ESRCH is perf event syscall errno for pid's not found. */
+	if (err != -ESRCH)
+		return false;
+
+	/* If there's only one thread, let it fail. */
+	if (threads->nr == 1)
+		return false;
+
+	/*
+	 * We should remove fd for missing_thread first
+	 * because thread_map__remove() will decrease threads->nr.
+	 */
+	if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread))
+		return false;
+
+	if (thread_map__remove(threads, thread))
+		return false;
+
+	pr_warning("WARNING: Ignored open failure for pid %d\n",
+		   ignore_pid);
+	return true;
+}
+
+static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
+				void *priv __maybe_unused)
+{
+	return fprintf(fp, "  %-32s %s\n", name, val);
+}
+
+static void display_attr(struct perf_event_attr *attr)
+{
+	if (verbose >= 2 || debug_peo_args) {
+		fprintf(stderr, "%.60s\n", graph_dotted_line);
+		fprintf(stderr, "perf_event_attr:\n");
+		perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
+		fprintf(stderr, "%.60s\n", graph_dotted_line);
+	}
+}
+
+bool evsel__precise_ip_fallback(struct evsel *evsel)
+{
+	/* Do not try less precise if not requested. */
+	if (!evsel->precise_max)
+		return false;
+
+	/*
+	 * We tried all the precise_ip values, and it's
+	 * still failing, so leave it to standard fallback.
+	 */
+	if (!evsel->core.attr.precise_ip) {
+		evsel->core.attr.precise_ip = evsel->precise_ip_original;
+		return false;
+	}
+
+	if (!evsel->precise_ip_original)
+		evsel->precise_ip_original = evsel->core.attr.precise_ip;
+
+	evsel->core.attr.precise_ip--;
+	pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
+	display_attr(&evsel->core.attr);
+	return true;
+}
+
+static struct perf_cpu_map *empty_cpu_map;
+static struct perf_thread_map *empty_thread_map;
+
+static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
+		struct perf_thread_map *threads)
+{
+	int ret = 0;
+	int nthreads = perf_thread_map__nr(threads);
+
+	if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
+	    (perf_missing_features.aux_output     && evsel->core.attr.aux_output))
+		return -EINVAL;
+
+	if (cpus == NULL) {
+		if (empty_cpu_map == NULL) {
+			empty_cpu_map = perf_cpu_map__new_any_cpu();
+			if (empty_cpu_map == NULL)
+				return -ENOMEM;
+		}
+
+		cpus = empty_cpu_map;
+	}
+
+	if (threads == NULL) {
+		if (empty_thread_map == NULL) {
+			empty_thread_map = thread_map__new_by_tid(-1);
+			if (empty_thread_map == NULL)
+				return -ENOMEM;
+		}
+
+		threads = empty_thread_map;
+	}
+
+	if (evsel->core.fd == NULL &&
+	    perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
+		return -ENOMEM;
+
+	if (evsel__is_tool(evsel))
+		ret = evsel__tool_pmu_prepare_open(evsel, cpus, nthreads);
+
+	evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
+	if (evsel->cgrp)
+		evsel->open_flags |= PERF_FLAG_PID_CGROUP;
+
+	return ret;
+}
+
+static void evsel__disable_missing_features(struct evsel *evsel)
+{
+	if (perf_missing_features.defer_callchain && evsel->core.attr.defer_callchain)
+		evsel->core.attr.defer_callchain = 0;
+	if (perf_missing_features.defer_callchain && evsel->core.attr.defer_output)
+		evsel->core.attr.defer_output = 0;
+	if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit &&
+	    (evsel->core.attr.sample_type & PERF_SAMPLE_READ))
+		evsel->core.attr.inherit = 0;
+	if (perf_missing_features.branch_counters)
+		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS;
+	if (perf_missing_features.read_lost)
+		evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
+	if (perf_missing_features.weight_struct) {
+		evsel__set_sample_bit(evsel, WEIGHT);
+		evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
+	}
+	if (perf_missing_features.clockid_wrong)
+		evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
+	if (perf_missing_features.clockid) {
+		evsel->core.attr.use_clockid = 0;
+		evsel->core.attr.clockid = 0;
+	}
+	if (perf_missing_features.cloexec)
+		evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
+	if (perf_missing_features.mmap2)
+		evsel->core.attr.mmap2 = 0;
+	if (evsel->pmu && evsel->pmu->missing_features.exclude_guest)
+		evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
+	if (perf_missing_features.lbr_flags)
+		evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
+				     PERF_SAMPLE_BRANCH_NO_CYCLES);
+	if (perf_missing_features.group_read && evsel->core.attr.inherit)
+		evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+	if (perf_missing_features.ksymbol)
+		evsel->core.attr.ksymbol = 0;
+	if (perf_missing_features.bpf)
+		evsel->core.attr.bpf_event = 0;
+	if (perf_missing_features.branch_hw_idx)
+		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
+	if (perf_missing_features.sample_id_all)
+		evsel->core.attr.sample_id_all = 0;
+}
+
+int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
+			struct perf_thread_map *threads)
+{
+	int err;
+
+	err = __evsel__prepare_open(evsel, cpus, threads);
+	if (err)
+		return err;
+
+	evsel__disable_missing_features(evsel);
+
+	return err;
+}
+
+static bool __has_attr_feature(struct perf_event_attr *attr,
+			       struct perf_cpu cpu, unsigned long flags)
+{
+	int fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
+			 /*group_fd=*/-1, flags);
+	close(fd);
+
+	if (fd < 0) {
+		attr->exclude_kernel = 1;
+
+		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
+			     /*group_fd=*/-1, flags);
+		close(fd);
+	}
+
+	if (fd < 0) {
+		attr->exclude_hv = 1;
+
+		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
+			     /*group_fd=*/-1, flags);
+		close(fd);
+	}
+
+	if (fd < 0) {
+		attr->exclude_guest = 1;
+
+		fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, cpu.cpu,
+			     /*group_fd=*/-1, flags);
+		close(fd);
+	}
+
+	attr->exclude_kernel = 0;
+	attr->exclude_guest = 0;
+	attr->exclude_hv = 0;
+
+	return fd >= 0;
+}
+
+static bool has_attr_feature(struct perf_event_attr *attr, unsigned long flags)
+{
+	struct perf_cpu cpu = {.cpu = -1};
+
+	return __has_attr_feature(attr, cpu, flags);
+}
+
+static void evsel__detect_missing_pmu_features(struct evsel *evsel)
+{
+	struct perf_event_attr attr = {
+		.type = evsel->core.attr.type,
+		.config = evsel->core.attr.config,
+		.disabled = 1,
+	};
+	struct perf_pmu *pmu = evsel->pmu;
+	int old_errno;
+
+	old_errno = errno;
+
+	if (pmu == NULL)
+		pmu = evsel->pmu = evsel__find_pmu(evsel);
+
+	if (pmu == NULL || pmu->missing_features.checked)
+		goto out;
+
+	/*
+	 * Must probe features in the order they were added to the
+	 * perf_event_attr interface.  These are kernel core limitation but
+	 * specific to PMUs with branch stack.  So we can detect with the given
+	 * hardware event and stop on the first one succeeded.
+	 */
+
+	/* Please add new feature detection here. */
+
+	attr.exclude_guest = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	pmu->missing_features.exclude_guest = true;
+	pr_debug2("switching off exclude_guest for PMU %s\n", pmu->name);
+
+found:
+	pmu->missing_features.checked = true;
+out:
+	errno = old_errno;
+}
+
+static void evsel__detect_missing_brstack_features(struct evsel *evsel)
+{
+	static bool detection_done = false;
+	struct perf_event_attr attr = {
+		.type = evsel->core.attr.type,
+		.config = evsel->core.attr.config,
+		.disabled = 1,
+		.sample_type = PERF_SAMPLE_BRANCH_STACK,
+		.sample_period = 1000,
+	};
+	int old_errno;
+
+	if (detection_done)
+		return;
+
+	old_errno = errno;
+
+	/*
+	 * Must probe features in the order they were added to the
+	 * perf_event_attr interface.  These are PMU specific limitation
+	 * so we can detect with the given hardware event and stop on the
+	 * first one succeeded.
+	 */
+
+	/* Please add new feature detection here. */
+
+	attr.branch_sample_type = PERF_SAMPLE_BRANCH_COUNTERS;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.branch_counters = true;
+	pr_debug2("switching off branch counters support\n");
+
+	attr.branch_sample_type = PERF_SAMPLE_BRANCH_HW_INDEX;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.branch_hw_idx = true;
+	pr_debug2("switching off branch HW index support\n");
+
+	attr.branch_sample_type = PERF_SAMPLE_BRANCH_NO_CYCLES | PERF_SAMPLE_BRANCH_NO_FLAGS;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.lbr_flags = true;
+	pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
+
+found:
+	detection_done = true;
+	errno = old_errno;
+}
+
+static bool evsel__probe_aux_action(struct evsel *evsel, struct perf_cpu cpu)
+{
+	struct perf_event_attr attr = evsel->core.attr;
+	int old_errno = errno;
+
+	attr.disabled = 1;
+	attr.aux_start_paused = 1;
+
+	if (__has_attr_feature(&attr, cpu, /*flags=*/0)) {
+		errno = old_errno;
+		return true;
+	}
+
+	/*
+	 * EOPNOTSUPP means the kernel supports the feature but the PMU does
+	 * not, so keep that distinction if possible.
+	 */
+	if (errno != EOPNOTSUPP)
+		errno = old_errno;
+
+	return false;
+}
+
+static void evsel__detect_missing_aux_action_feature(struct evsel *evsel, struct perf_cpu cpu)
+{
+	static bool detection_done;
+	struct evsel *leader;
+
+	/*
+	 * Don't bother probing aux_action if it is not being used or has been
+	 * probed before.
+	 */
+	if (!evsel->core.attr.aux_action || detection_done)
+		return;
+
+	detection_done = true;
+
+	/*
+	 * The leader is an AUX area event. If it has failed, assume the feature
+	 * is not supported.
+	 */
+	leader = evsel__leader(evsel);
+	if (evsel == leader) {
+		perf_missing_features.aux_action = true;
+		return;
+	}
+
+	/*
+	 * AUX area event with aux_action must have been opened successfully
+	 * already, so feature is supported.
+	 */
+	if (leader->core.attr.aux_action)
+		return;
+
+	if (!evsel__probe_aux_action(leader, cpu))
+		perf_missing_features.aux_action = true;
+}
+
+static bool evsel__detect_missing_features(struct evsel *evsel, struct perf_cpu cpu)
+{
+	static bool detection_done = false;
+	struct perf_event_attr attr = {
+		.type = PERF_TYPE_SOFTWARE,
+		.config = PERF_COUNT_SW_TASK_CLOCK,
+		.disabled = 1,
+	};
+	int old_errno;
+
+	evsel__detect_missing_aux_action_feature(evsel, cpu);
+
+	evsel__detect_missing_pmu_features(evsel);
+
+	if (evsel__has_br_stack(evsel))
+		evsel__detect_missing_brstack_features(evsel);
+
+	if (detection_done)
+		goto check;
+
+	old_errno = errno;
+
+	/*
+	 * Must probe features in the order they were added to the
+	 * perf_event_attr interface.  These are kernel core limitation
+	 * not PMU-specific so we can detect with a software event and
+	 * stop on the first one succeeded.
+	 */
+
+	/* Please add new feature detection here. */
+
+	attr.defer_callchain = true;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.defer_callchain = true;
+	pr_debug2("switching off deferred callchain support\n");
+	attr.defer_callchain = false;
+
+	attr.inherit = true;
+	attr.sample_type = PERF_SAMPLE_READ | PERF_SAMPLE_TID;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.inherit_sample_read = true;
+	pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n");
+	attr.inherit = false;
+	attr.sample_type = 0;
+
+	attr.read_format = PERF_FORMAT_LOST;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.read_lost = true;
+	pr_debug2("switching off PERF_FORMAT_LOST support\n");
+	attr.read_format = 0;
+
+	attr.sample_type = PERF_SAMPLE_WEIGHT_STRUCT;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.weight_struct = true;
+	pr_debug2("switching off weight struct support\n");
+	attr.sample_type = 0;
+
+	attr.sample_type = PERF_SAMPLE_CODE_PAGE_SIZE;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.code_page_size = true;
+	pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support\n");
+	attr.sample_type = 0;
+
+	attr.sample_type = PERF_SAMPLE_DATA_PAGE_SIZE;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.data_page_size = true;
+	pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support\n");
+	attr.sample_type = 0;
+
+	attr.cgroup = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.cgroup = true;
+	pr_debug2_peo("Kernel has no cgroup sampling support\n");
+	attr.cgroup = 0;
+
+	attr.aux_output = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.aux_output = true;
+	pr_debug2_peo("Kernel has no attr.aux_output support\n");
+	attr.aux_output = 0;
+
+	attr.bpf_event = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.bpf = true;
+	pr_debug2_peo("switching off bpf_event\n");
+	attr.bpf_event = 0;
+
+	attr.ksymbol = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.ksymbol = true;
+	pr_debug2_peo("switching off ksymbol\n");
+	attr.ksymbol = 0;
+
+	attr.write_backward = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.write_backward = true;
+	pr_debug2_peo("switching off write_backward\n");
+	attr.write_backward = 0;
+
+	attr.use_clockid = 1;
+	attr.clockid = CLOCK_MONOTONIC;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.clockid = true;
+	pr_debug2_peo("switching off clockid\n");
+	attr.use_clockid = 0;
+	attr.clockid = 0;
+
+	if (has_attr_feature(&attr, /*flags=*/PERF_FLAG_FD_CLOEXEC))
+		goto found;
+	perf_missing_features.cloexec = true;
+	pr_debug2_peo("switching off cloexec flag\n");
+
+	attr.mmap2 = 1;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.mmap2 = true;
+	pr_debug2_peo("switching off mmap2\n");
+	attr.mmap2 = 0;
+
+	/* set this unconditionally? */
+	perf_missing_features.sample_id_all = true;
+	pr_debug2_peo("switching off sample_id_all\n");
+
+	attr.inherit = 1;
+	attr.read_format = PERF_FORMAT_GROUP;
+	if (has_attr_feature(&attr, /*flags=*/0))
+		goto found;
+	perf_missing_features.group_read = true;
+	pr_debug2_peo("switching off group read\n");
+	attr.inherit = 0;
+	attr.read_format = 0;
+
+found:
+	detection_done = true;
+	errno = old_errno;
+
+check:
+	if ((evsel->core.attr.defer_callchain || evsel->core.attr.defer_output) &&
+	    perf_missing_features.defer_callchain)
+		return true;
+
+	if (evsel->core.attr.inherit &&
+	    (evsel->core.attr.sample_type & PERF_SAMPLE_READ) &&
+	    perf_missing_features.inherit_sample_read)
+		return true;
+
+	if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
+	    perf_missing_features.branch_counters)
+		return true;
+
+	if ((evsel->core.attr.read_format & PERF_FORMAT_LOST) &&
+	    perf_missing_features.read_lost)
+		return true;
+
+	if ((evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT) &&
+	    perf_missing_features.weight_struct)
+		return true;
+
+	if (evsel->core.attr.use_clockid && evsel->core.attr.clockid != CLOCK_MONOTONIC &&
+	    !perf_missing_features.clockid) {
+		perf_missing_features.clockid_wrong = true;
+		return true;
+	}
+
+	if (evsel->core.attr.use_clockid && perf_missing_features.clockid)
+		return true;
+
+	if ((evsel->open_flags & PERF_FLAG_FD_CLOEXEC) &&
+	    perf_missing_features.cloexec)
+		return true;
+
+	if (evsel->core.attr.mmap2 && perf_missing_features.mmap2)
+		return true;
+
+	if ((evsel->core.attr.branch_sample_type & (PERF_SAMPLE_BRANCH_NO_FLAGS |
+						    PERF_SAMPLE_BRANCH_NO_CYCLES)) &&
+	    perf_missing_features.lbr_flags)
+		return true;
+
+	if (evsel->core.attr.inherit && (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
+	    perf_missing_features.group_read)
+		return true;
+
+	if (evsel->core.attr.ksymbol && perf_missing_features.ksymbol)
+		return true;
+
+	if (evsel->core.attr.bpf_event && perf_missing_features.bpf)
+		return true;
+
+	if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX) &&
+	    perf_missing_features.branch_hw_idx)
+		return true;
+
+	if (evsel->core.attr.sample_id_all && perf_missing_features.sample_id_all)
+		return true;
+
+	return false;
+}
+
+static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
+		struct perf_thread_map *threads,
+		int start_cpu_map_idx, int end_cpu_map_idx)
+{
+	int idx, thread, nthreads;
+	int pid = -1, err, old_errno;
+	enum rlimit_action set_rlimit = NO_CHANGE;
+	struct perf_cpu cpu;
+
+	if (evsel__is_retire_lat(evsel)) {
+		err = evsel__tpebs_open(evsel);
+		goto out;
+	}
+
+	err = __evsel__prepare_open(evsel, cpus, threads);
+	if (err)
+		goto out;
+
+	if (cpus == NULL)
+		cpus = empty_cpu_map;
+
+	if (threads == NULL)
+		threads = empty_thread_map;
+
+	nthreads = perf_thread_map__nr(threads);
+
+	if (evsel->cgrp)
+		pid = evsel->cgrp->fd;
+
+fallback_missing_features:
+	evsel__disable_missing_features(evsel);
+
+	pr_debug3("Opening: %s\n", evsel__name(evsel));
+	display_attr(&evsel->core.attr);
+
+	if (evsel__is_tool(evsel)) {
+		err = evsel__tool_pmu_open(evsel, threads,
+					   start_cpu_map_idx,
+					   end_cpu_map_idx);
+		goto out;
+	}
+	if (evsel__is_hwmon(evsel)) {
+		err = evsel__hwmon_pmu_open(evsel, threads,
+					    start_cpu_map_idx,
+					    end_cpu_map_idx);
+		goto out;
+	}
+	if (evsel__is_drm(evsel)) {
+		err = evsel__drm_pmu_open(evsel, threads,
+					  start_cpu_map_idx,
+					  end_cpu_map_idx);
+		goto out;
+	}
+
+	for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
+		cpu = perf_cpu_map__cpu(cpus, idx);
+
+		for (thread = 0; thread < nthreads; thread++) {
+			int fd, group_fd;
+retry_open:
+			if (thread >= nthreads)
+				break;
+
+			if (!evsel->cgrp && !evsel->core.system_wide)
+				pid = perf_thread_map__pid(threads, thread);
+
+			group_fd = get_group_fd(evsel, idx, thread);
+
+			if (group_fd == -2) {
+				pr_debug("broken group leader for %s\n", evsel->name);
+				err = -EINVAL;
+				goto out_close;
+			}
+
+			/* Debug message used by test scripts */
+			pr_debug2_peo("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
+				pid, cpu.cpu, group_fd, evsel->open_flags);
+
+			fd = sys_perf_event_open(&evsel->core.attr, pid, cpu.cpu,
+						group_fd, evsel->open_flags);
+
+			FD(evsel, idx, thread) = fd;
+
+			if (fd < 0) {
+				err = -errno;
+
+				pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
+					  err);
+				goto try_fallback;
+			}
+
+			bpf_counter__install_pe(evsel, idx, fd);
+
+			if (unlikely(test_attr__enabled())) {
+				test_attr__open(&evsel->core.attr, pid, cpu,
+						fd, group_fd, evsel->open_flags);
+			}
+
+			/* Debug message used by test scripts */
+			pr_debug2_peo(" = %d\n", fd);
+
+			set_rlimit = NO_CHANGE;
+
+			/*
+			 * If we succeeded but had to kill clockid, fail and
+			 * have evsel__open_strerror() print us a nice error.
+			 */
+			if (perf_missing_features.clockid ||
+			    perf_missing_features.clockid_wrong) {
+				err = -EINVAL;
+				goto out_close;
+			}
+		}
+	}
+
+	err = 0;
+	goto out;
+
+try_fallback:
+	if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus),
+					 idx, threads, thread, err)) {
+		/* We just removed 1 thread, so lower the upper nthreads limit. */
+		nthreads--;
+
+		/* ... and pretend like nothing have happened. */
+		err = 0;
+		goto retry_open;
+	}
+	/*
+	 * perf stat needs between 5 and 22 fds per CPU. When we run out
+	 * of them try to increase the limits.
+	 */
+	if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit))
+		goto retry_open;
+
+	if (err == -EINVAL && evsel__detect_missing_features(evsel, cpu))
+		goto fallback_missing_features;
+
+	if (evsel__precise_ip_fallback(evsel))
+		goto retry_open;
+
+out_close:
+	if (err)
+		threads->err_thread = thread;
+
+	old_errno = errno;
+	do {
+		while (--thread >= 0) {
+			if (FD(evsel, idx, thread) >= 0)
+				close(FD(evsel, idx, thread));
+			FD(evsel, idx, thread) = -1;
+		}
+		thread = nthreads;
+	} while (--idx >= 0);
+	errno = old_errno;
+out:
+	if (err)
+		evsel->supported = false;
+	return err;
+}
+
+int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
+		struct perf_thread_map *threads)
+{
+	return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
+}
+
+void evsel__close(struct evsel *evsel)
+{
+	if (evsel__is_retire_lat(evsel))
+		evsel__tpebs_close(evsel);
+	perf_evsel__close(&evsel->core);
+	perf_evsel__free_id(&evsel->core);
+}
+
+int evsel__open_per_cpu_and_thread(struct evsel *evsel,
+				   struct perf_cpu_map *cpus, int cpu_map_idx,
+				   struct perf_thread_map *threads)
+{
+	if (cpu_map_idx == -1)
+		return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
+
+	return evsel__open_cpu(evsel, cpus, threads, cpu_map_idx, cpu_map_idx + 1);
+}
+
+int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx)
+{
+	struct perf_thread_map *threads = thread_map__new_by_tid(-1);
+	int ret = evsel__open_per_cpu_and_thread(evsel, cpus, cpu_map_idx, threads);
+
+	perf_thread_map__put(threads);
+	return ret;
+}
+
+int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
+{
+	struct perf_cpu_map *cpus = perf_cpu_map__new_any_cpu();
+	int ret = evsel__open_per_cpu_and_thread(evsel, cpus, -1, threads);
+
+	perf_cpu_map__put(cpus);
+	return ret;
+}
+
+static int perf_evsel__parse_id_sample(const union perf_event *event,
+				       struct perf_sample *sample)
+{
+	const struct evsel *evsel = sample->evsel;
+	u64 type = evsel->core.attr.sample_type;
+	const __u64 *array = event->sample.array;
+	bool swapped = evsel->needs_swap;
+	union u64_swap u;
+	int i = ((event->header.size - sizeof(event->header)) / sizeof(u64)) - 1;
+
+	if (type & PERF_SAMPLE_IDENTIFIER) {
+		if (i < 0)
+			return -EFAULT;
+
+		sample->id = array[i--];
+	}
+
+	if (type & PERF_SAMPLE_CPU) {
+		if (i < 0)
+			return -EFAULT;
+
+		u.val64 = array[i--];
+		if (swapped) {
+			/* undo swap of u64, then swap on individual u32s */
+			u.val64 = bswap_64(u.val64);
+			u.val32[0] = bswap_32(u.val32[0]);
+		}
+		sample->cpu = u.val32[0];
+	}
+
+	if (type & PERF_SAMPLE_STREAM_ID) {
+		if (i < 0)
+			return -EFAULT;
+
+		sample->stream_id = array[i--];
+	}
+
+	if (type & PERF_SAMPLE_ID) {
+		if (i < 0)
+			return -EFAULT;
+
+		sample->id = array[i--];
+	}
+
+	if (type & PERF_SAMPLE_TIME) {
+		if (i < 0)
+			return -EFAULT;
+
+		sample->time = array[i--];
+	}
+
+	if (type & PERF_SAMPLE_TID) {
+		if (i < 0)
+			return -EFAULT;
+
+		u.val64 = array[i--];
+		if (swapped) {
+			/* undo swap of u64, then swap on individual u32s */
+			u.val64 = bswap_64(u.val64);
+			u.val32[0] = bswap_32(u.val32[0]);
+			u.val32[1] = bswap_32(u.val32[1]);
+		}
+
+		sample->pid = u.val32[0];
+		sample->tid = u.val32[1];
+	}
+
+	return 0;
+}
+
+static inline bool overflow(const void *endp, u16 max_size, const void *offset,
+			    u64 size)
+{
+	return size > max_size || offset + size > endp;
+}
+
+#define OVERFLOW_CHECK(offset, size, max_size)				\
+	do {								\
+		if (overflow(endp, (max_size), (offset), (size)))	\
+			goto out_efault;				\
+	} while (0)
+
+#define OVERFLOW_CHECK_u64(offset) \
+	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
+
+static int
+perf_event__check_size(union perf_event *event, unsigned int sample_size)
+{
+	/*
+	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
+	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
+	 * check the format does not go past the end of the event.
+	 */
+	if (sample_size + sizeof(event->header) > event->header.size)
+		return -EFAULT;
+
+	return 0;
+}
+
+static void perf_parse_sample_weight(struct perf_sample *data, const __u64 *array, u64 type)
+{
+	union perf_sample_weight weight;
+
+	weight.full = *array;
+	if (type & PERF_SAMPLE_WEIGHT_STRUCT) {
+		data->weight = weight.var1_dw;
+		data->ins_lat = weight.var2_w;
+		data->weight3 = weight.var3_w;
+	} else {
+		data->weight = weight.full;
+	}
+}
+
+u64 evsel__bitfield_swap_branch_flags(u64 value)
+{
+	u64 new_val = 0;
+
+	/*
+	 * branch_flags
+	 * union {
+	 * 	u64 values;
+	 * 	struct {
+	 * 		mispred:1	//target mispredicted
+	 * 		predicted:1	//target predicted
+	 * 		in_tx:1		//in transaction
+	 * 		abort:1		//transaction abort
+	 * 		cycles:16	//cycle count to last branch
+	 * 		type:4		//branch type
+	 * 		spec:2		//branch speculation info
+	 * 		new_type:4	//additional branch type
+	 * 		priv:3		//privilege level
+	 * 		reserved:31
+	 * 	}
+	 * }
+	 *
+	 * Avoid bswap64() the entire branch_flag.value,
+	 * as it has variable bit-field sizes. Instead the
+	 * macro takes the bit-field position/size,
+	 * swaps it based on the host endianness.
+	 */
+	if (host_is_bigendian()) {
+		new_val = bitfield_swap(value, 0, 1);
+		new_val |= bitfield_swap(value, 1, 1);
+		new_val |= bitfield_swap(value, 2, 1);
+		new_val |= bitfield_swap(value, 3, 1);
+		new_val |= bitfield_swap(value, 4, 16);
+		new_val |= bitfield_swap(value, 20, 4);
+		new_val |= bitfield_swap(value, 24, 2);
+		new_val |= bitfield_swap(value, 26, 4);
+		new_val |= bitfield_swap(value, 30, 3);
+		new_val |= bitfield_swap(value, 33, 31);
+	} else {
+		new_val = bitfield_swap(value, 63, 1);
+		new_val |= bitfield_swap(value, 62, 1);
+		new_val |= bitfield_swap(value, 61, 1);
+		new_val |= bitfield_swap(value, 60, 1);
+		new_val |= bitfield_swap(value, 44, 16);
+		new_val |= bitfield_swap(value, 40, 4);
+		new_val |= bitfield_swap(value, 38, 2);
+		new_val |= bitfield_swap(value, 34, 4);
+		new_val |= bitfield_swap(value, 31, 3);
+		new_val |= bitfield_swap(value, 0, 31);
+	}
+
+	return new_val;
+}
+
+static inline bool evsel__has_branch_counters(const struct evsel *evsel)
+{
+	struct evsel *leader = evsel__leader(evsel);
+
+	/* The branch counters feature only supports group */
+	if (!leader || !evsel->evlist)
+		return false;
+
+	if (evlist__nr_br_cntr(evsel->evlist) < 0)
+		evlist__update_br_cntr(evsel->evlist);
+
+	if (leader->br_cntr_nr > 0)
+		return true;
+
+	return false;
+}
+
+static int __set_offcpu_sample(struct perf_sample *data)
+{
+	u64 *array = data->raw_data;
+	u32 max_size = data->raw_size, *p32;
+	const void *endp = (void *)array + max_size;
+
+	if (array == NULL)
+		return -EFAULT;
+
+	OVERFLOW_CHECK_u64(array);
+	p32 = (void *)array++;
+	data->pid = p32[0];
+	data->tid = p32[1];
+
+	OVERFLOW_CHECK_u64(array);
+	data->period = *array++;
+
+	OVERFLOW_CHECK_u64(array);
+	data->callchain = (struct ip_callchain *)array++;
+	OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size);
+	data->ip = data->callchain->ips[1];
+	array += data->callchain->nr;
+
+	OVERFLOW_CHECK_u64(array);
+	data->cgroup = *array;
+
+	return 0;
+out_efault:
+	return -EFAULT;
+}
+
+int __evsel__parse_sample(struct evsel *evsel, union perf_event *event,
+			  struct perf_sample *data, bool needs_swap)
+{
+	u64 type = evsel->core.attr.sample_type;
+	bool swapped = needs_swap;
+	const __u64 *array;
+	u16 max_size = event->header.size;
+	const void *endp = (void *)event + max_size;
+	u64 sz;
+
+	/*
+	 * used for cross-endian analysis. See git commit 65014ab3
+	 * for why this goofiness is needed.
+	 */
+	union u64_swap u;
+
+	perf_sample__init(data, /*all=*/true);
+	data->evsel = evsel__get(evsel);
+	data->cpu = data->pid = data->tid = -1;
+	data->stream_id = data->id = data->time = -1ULL;
+	data->period = evsel->core.attr.sample_period;
+	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+	data->misc    = event->header.misc;
+	data->data_src = PERF_MEM_DATA_SRC_NONE;
+	data->vcpu = -1;
+
+	if (event->header.type == PERF_RECORD_CALLCHAIN_DEFERRED) {
+		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
+
+		data->callchain = (struct ip_callchain *)&event->callchain_deferred.nr;
+		if (data->callchain->nr > max_callchain_nr)
+			goto out_efault;
+
+		data->deferred_cookie = event->callchain_deferred.cookie;
+
+		if (evsel->core.attr.sample_id_all) {
+			if (perf_evsel__parse_id_sample(event, data))
+				goto out_efault;
+		}
+		return 0;
+	}
+
+	if (event->header.type != PERF_RECORD_SAMPLE) {
+		if (evsel->core.attr.sample_id_all) {
+			if (perf_evsel__parse_id_sample(event, data))
+				goto out_efault;
+		}
+		return 0;
+	}
+
+	array = event->sample.array;
+
+	if (perf_event__check_size(event, evsel->sample_size))
+		goto out_efault;
+
+	if (type & PERF_SAMPLE_IDENTIFIER) {
+		data->id = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_IP) {
+		data->ip = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_TID) {
+		u.val64 = *array;
+		if (swapped) {
+			/* undo swap of u64, then swap on individual u32s */
+			u.val64 = bswap_64(u.val64);
+			u.val32[0] = bswap_32(u.val32[0]);
+			u.val32[1] = bswap_32(u.val32[1]);
+		}
+
+		data->pid = u.val32[0];
+		data->tid = u.val32[1];
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_TIME) {
+		data->time = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_ADDR) {
+		data->addr = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_ID) {
+		data->id = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_STREAM_ID) {
+		data->stream_id = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_CPU) {
+
+		u.val64 = *array;
+		if (swapped) {
+			/* undo swap of u64, then swap on individual u32s */
+			u.val64 = bswap_64(u.val64);
+			u.val32[0] = bswap_32(u.val32[0]);
+		}
+
+		data->cpu = u.val32[0];
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_PERIOD) {
+		data->period = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_READ) {
+		u64 read_format = evsel->core.attr.read_format;
+
+		OVERFLOW_CHECK_u64(array);
+		if (read_format & PERF_FORMAT_GROUP)
+			data->read.group.nr = *array;
+		else
+			data->read.one.value = *array;
+
+		array++;
+
+		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+			OVERFLOW_CHECK_u64(array);
+			data->read.time_enabled = *array;
+			array++;
+		}
+
+		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+			OVERFLOW_CHECK_u64(array);
+			data->read.time_running = *array;
+			array++;
+		}
+
+		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
+		if (read_format & PERF_FORMAT_GROUP) {
+			const u64 max_group_nr = UINT64_MAX /
+					sizeof(struct sample_read_value);
+
+			if (data->read.group.nr > max_group_nr)
+				goto out_efault;
+
+			sz = data->read.group.nr * sample_read_value_size(read_format);
+			OVERFLOW_CHECK(array, sz, max_size);
+			data->read.group.values =
+					(struct sample_read_value *)array;
+			array = (void *)array + sz;
+		} else {
+			OVERFLOW_CHECK_u64(array);
+			data->read.one.id = *array;
+			array++;
+
+			if (read_format & PERF_FORMAT_LOST) {
+				OVERFLOW_CHECK_u64(array);
+				data->read.one.lost = *array;
+				array++;
+			}
+		}
+	}
+
+	if (type & PERF_SAMPLE_CALLCHAIN) {
+		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
+		u64 callchain_nr;
+
+		OVERFLOW_CHECK_u64(array);
+		data->callchain = (struct ip_callchain *)array++;
+		callchain_nr = data->callchain->nr;
+		if (callchain_nr > max_callchain_nr)
+			goto out_efault;
+		sz = callchain_nr * sizeof(u64);
+		/*
+		 * Save the cookie for the deferred user callchain.  The last 2
+		 * entries in the callchain should be the context marker and the
+		 * cookie.  The cookie will be used to match PERF_RECORD_
+		 * CALLCHAIN_DEFERRED later.
+		 */
+		if (evsel->core.attr.defer_callchain && callchain_nr >= 2 &&
+		    data->callchain->ips[callchain_nr - 2] == PERF_CONTEXT_USER_DEFERRED) {
+			data->deferred_cookie = data->callchain->ips[callchain_nr - 1];
+			data->deferred_callchain = true;
+		}
+		OVERFLOW_CHECK(array, sz, max_size);
+		array = (void *)array + sz;
+	}
+
+	if (type & PERF_SAMPLE_RAW) {
+		OVERFLOW_CHECK_u64(array);
+		u.val64 = *array;
+
+		/*
+		 * Undo swap of u64, then swap on individual u32s,
+		 * get the size of the raw area and undo all of the
+		 * swap. The pevent interface handles endianness by
+		 * itself.
+		 */
+		if (swapped) {
+			u.val64 = bswap_64(u.val64);
+			u.val32[0] = bswap_32(u.val32[0]);
+			u.val32[1] = bswap_32(u.val32[1]);
+		}
+		data->raw_size = u.val32[0];
+
+		/*
+		 * The raw data is aligned on 64bits including the
+		 * u32 size, so it's safe to use mem_bswap_64.
+		 */
+		if (swapped)
+			mem_bswap_64((void *) array, data->raw_size);
+
+		array = (void *)array + sizeof(u32);
+
+		OVERFLOW_CHECK(array, data->raw_size, max_size);
+		data->raw_data = (void *)array;
+		array = (void *)array + data->raw_size;
+	}
+
+	if (type & PERF_SAMPLE_BRANCH_STACK) {
+		const u64 max_branch_nr = UINT64_MAX /
+					  sizeof(struct branch_entry);
+		struct branch_entry *e;
+		unsigned int i;
+
+		OVERFLOW_CHECK_u64(array);
+		data->branch_stack = (struct branch_stack *)array++;
+
+		if (data->branch_stack->nr > max_branch_nr)
+			goto out_efault;
+
+		sz = data->branch_stack->nr * sizeof(struct branch_entry);
+		if (evsel__has_branch_hw_idx(evsel)) {
+			sz += sizeof(u64);
+			e = &data->branch_stack->entries[0];
+		} else {
+			data->no_hw_idx = true;
+			/*
+			 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied,
+			 * only nr and entries[] will be output by kernel.
+			 */
+			e = (struct branch_entry *)&data->branch_stack->hw_idx;
+		}
+
+		if (swapped) {
+			/*
+			 * struct branch_flag does not have endian
+			 * specific bit field definition. And bswap
+			 * will not resolve the issue, since these
+			 * are bit fields.
+			 *
+			 * evsel__bitfield_swap_branch_flags() uses a
+			 * bitfield_swap macro to swap the bit position
+			 * based on the host endians.
+			 */
+			for (i = 0; i < data->branch_stack->nr; i++, e++)
+				e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value);
+		}
+
+		OVERFLOW_CHECK(array, sz, max_size);
+		array = (void *)array + sz;
+
+		if (evsel__has_branch_counters(evsel)) {
+			data->branch_stack_cntr = (u64 *)array;
+			sz = data->branch_stack->nr * sizeof(u64);
+
+			OVERFLOW_CHECK(array, sz, max_size);
+			array = (void *)array + sz;
+		}
+	}
+
+	if (type & PERF_SAMPLE_REGS_USER) {
+		struct regs_dump *regs = perf_sample__user_regs(data);
+
+		OVERFLOW_CHECK_u64(array);
+		regs->abi = *array;
+		array++;
+
+		if (regs->abi) {
+			u64 mask = evsel->core.attr.sample_regs_user;
+
+			sz = hweight64(mask) * sizeof(u64);
+			OVERFLOW_CHECK(array, sz, max_size);
+			regs->mask = mask;
+			regs->regs = (u64 *)array;
+			array = (void *)array + sz;
+		}
+	}
+
+	if (type & PERF_SAMPLE_STACK_USER) {
+		OVERFLOW_CHECK_u64(array);
+		sz = *array++;
+
+		data->user_stack.offset = ((char *)(array - 1)
+					  - (char *) event);
+
+		if (!sz) {
+			data->user_stack.size = 0;
+		} else {
+			OVERFLOW_CHECK(array, sz, max_size);
+			data->user_stack.data = (char *)array;
+			array = (void *)array + sz;
+			OVERFLOW_CHECK_u64(array);
+			data->user_stack.size = *array++;
+			if (WARN_ONCE(data->user_stack.size > sz,
+				      "user stack dump failure\n"))
+				goto out_efault;
+		}
+	}
+
+	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
+		OVERFLOW_CHECK_u64(array);
+		perf_parse_sample_weight(data, array, type);
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_DATA_SRC) {
+		OVERFLOW_CHECK_u64(array);
+		data->data_src = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_TRANSACTION) {
+		OVERFLOW_CHECK_u64(array);
+		data->transaction = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_REGS_INTR) {
+		struct regs_dump *regs = perf_sample__intr_regs(data);
+
+		OVERFLOW_CHECK_u64(array);
+		regs->abi = *array;
+		array++;
+
+		if (regs->abi != PERF_SAMPLE_REGS_ABI_NONE) {
+			u64 mask = evsel->core.attr.sample_regs_intr;
+
+			sz = hweight64(mask) * sizeof(u64);
+			OVERFLOW_CHECK(array, sz, max_size);
+			regs->mask = mask;
+			regs->regs = (u64 *)array;
+			array = (void *)array + sz;
+		}
+	}
+
+	data->phys_addr = 0;
+	if (type & PERF_SAMPLE_PHYS_ADDR) {
+		data->phys_addr = *array;
+		array++;
+	}
+
+	data->cgroup = 0;
+	if (type & PERF_SAMPLE_CGROUP) {
+		data->cgroup = *array;
+		array++;
+	}
+
+	data->data_page_size = 0;
+	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
+		data->data_page_size = *array;
+		array++;
+	}
+
+	data->code_page_size = 0;
+	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
+		data->code_page_size = *array;
+		array++;
+	}
+
+	if (type & PERF_SAMPLE_AUX) {
+		OVERFLOW_CHECK_u64(array);
+		sz = *array++;
+
+		OVERFLOW_CHECK(array, sz, max_size);
+		/* Undo swap of data */
+		if (swapped)
+			mem_bswap_64((char *)array, sz);
+		data->aux_sample.size = sz;
+		data->aux_sample.data = (char *)array;
+		array = (void *)array + sz;
+	}
+
+	if (evsel__is_offcpu_event(evsel)) {
+		if (__set_offcpu_sample(data))
+			goto out_efault;
+	}
+
+	return 0;
+out_efault:
+	perf_sample__exit(data);
+	return -EFAULT;
+}
+
+int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
+				  u64 *timestamp)
+{
+	u64 type = evsel->core.attr.sample_type;
+	const __u64 *array;
+
+	if (!(type & PERF_SAMPLE_TIME))
+		return -1;
+
+	if (event->header.type != PERF_RECORD_SAMPLE) {
+		struct perf_sample data = {
+			.evsel = evsel,
+			.time = -1ULL,
+		};
+
+		if (!evsel->core.attr.sample_id_all)
+			return -1;
+		if (perf_evsel__parse_id_sample(event, &data))
+			return -1;
+
+		*timestamp = data.time;
+		return 0;
+	}
+
+	array = event->sample.array;
+
+	if (perf_event__check_size(event, evsel->sample_size))
+		return -EFAULT;
+
+	if (type & PERF_SAMPLE_IDENTIFIER)
+		array++;
+
+	if (type & PERF_SAMPLE_IP)
+		array++;
+
+	if (type & PERF_SAMPLE_TID)
+		array++;
+
+	if (type & PERF_SAMPLE_TIME)
+		*timestamp = *array;
+
+	return 0;
+}
+
+u16 evsel__id_hdr_size(const struct evsel *evsel)
+{
+	u64 sample_type = evsel->core.attr.sample_type;
+	u16 size = 0;
+
+	if (sample_type & PERF_SAMPLE_TID)
+		size += sizeof(u64);
+
+	if (sample_type & PERF_SAMPLE_TIME)
+		size += sizeof(u64);
+
+	if (sample_type & PERF_SAMPLE_ID)
+		size += sizeof(u64);
+
+	if (sample_type & PERF_SAMPLE_STREAM_ID)
+		size += sizeof(u64);
+
+	if (sample_type & PERF_SAMPLE_CPU)
+		size += sizeof(u64);
+
+	if (sample_type & PERF_SAMPLE_IDENTIFIER)
+		size += sizeof(u64);
+
+	return size;
+}
+
+#ifdef HAVE_LIBTRACEEVENT
+struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
+{
+	struct tep_event *tp_format = evsel__tp_format(evsel);
+
+	return tp_format ? tep_find_field(tp_format, name) : NULL;
+}
+
+struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name)
+{
+	struct tep_event *tp_format = evsel__tp_format(evsel);
+
+	return tp_format ? tep_find_common_field(tp_format, name) : NULL;
+}
+
+static bool out_of_bounds(const struct tep_format_field *field, int offset, int size, u32 raw_size)
+{
+	if (offset < 0) {
+		pr_warning("Negative trace point field offset %d in %s\n",
+			   offset, field->name);
+		return true;
+	}
+	if (size < 0) {
+		pr_warning("Negative trace point field size %d in %s\n",
+			   size, field->name);
+		return true;
+	}
+	if ((u32)offset + (u32)size > raw_size) {
+		pr_warning("Out of bound tracepoint field (%s) offset %d size %d in %u\n",
+			   field->name, offset, size, raw_size);
+		return true;
+	}
+	return false;
+}
+
+void *perf_sample__rawptr(struct perf_sample *sample, const char *name)
+{
+	struct tep_format_field *field = evsel__field(sample->evsel, name);
+	int offset, size;
+
+	if (!field)
+		return NULL;
+
+	offset = field->offset;
+	size = field->size;
+	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
+		int dynamic_data;
+
+		if (out_of_bounds(field, offset, 4, sample->raw_size))
+			return NULL;
+
+		dynamic_data = *(int *)(sample->raw_data + field->offset);
+
+		if (sample->evsel->needs_swap)
+			dynamic_data = bswap_32(dynamic_data);
+
+		offset = dynamic_data & 0xffff;
+		size = (dynamic_data >> 16) & 0xffff;
+
+		if (tep_field_is_relative(field->flags)) {
+			/*
+			 * Newer kernel feature: Relative offsets (__rel_loc).
+			 * If the relative flag is set, the parsed offset is not
+			 * absolute from the start of the record. Instead, it is
+			 * relative to the *end* of the dynamic field descriptor
+			 * itself.
+			 */
+			offset += field->offset + field->size;
+		}
+	}
+	if (out_of_bounds(field, offset, size, sample->raw_size))
+		return NULL;
+
+	return sample->raw_data + offset;
+}
+
+void *format_field__get_raw_data(struct tep_format_field *field, struct
+				 perf_sample *sample, bool needs_swap,
+				 u16 *len_out)
+{
+	int offset = field->offset;
+	int size = field->size;
+
+	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
+		unsigned int dynamic_data;
+
+		if (out_of_bounds(field, field->offset, field->size, sample->raw_size))
+			return NULL;
+
+		dynamic_data = format_field__intval(field, sample, needs_swap);
+
+		offset = dynamic_data & 0xffff;
+		size = (dynamic_data >> 16) & 0xffff;
+
+		if (tep_field_is_relative(field->flags))
+			offset += field->offset + field->size;
+	}
+
+	if (out_of_bounds(field, offset, size, sample->raw_size))
+		return NULL;
+
+	*len_out = size;
+	return sample->raw_data + offset;
+}
+
+unsigned long *format_field__get_cpumask(struct tep_format_field *field,
+					 struct perf_sample *sample,
+					 bool needs_swap, u16 *len_out)
+{
+	u16 len;
+	void *ptr = format_field__get_raw_data(field, sample, needs_swap, &len);
+	unsigned long *mask;
+	struct perf_env *env;
+	bool target_is_64;
+	int target_word_size;
+	int nr_words;
+	int bit_idx;
+	int nbits;
+
+	if (!ptr)
+		return NULL;
+
+	nbits = len * 8;
+	mask = bitmap_zalloc(nbits ?: 1);
+	if (!mask)
+		return NULL;
+
+	env = evsel__env(sample->evsel);
+	target_is_64 = env ? perf_env__kernel_is_64_bit(env) : (sizeof(void *) == 8);
+	target_word_size = target_is_64 ? 8 : 4;
+	nr_words = len / target_word_size;
+
+	for (bit_idx = 0; bit_idx < nbits; bit_idx++) {
+		int w_idx = bit_idx / (target_word_size * 8);
+		int bit_in_word = bit_idx % (target_word_size * 8);
+		bool set = false;
+
+		if (w_idx >= nr_words)
+			break;
+
+		if (target_is_64) {
+			u64 word;
+			memcpy(&word, (unsigned char *)ptr + w_idx * 8, 8);
+			if (needs_swap)
+				word = bswap_64(word);
+			set = (word & (1ULL << bit_in_word)) != 0;
+		} else {
+			u32 word32;
+			memcpy(&word32, (unsigned char *)ptr + w_idx * 4, 4);
+			if (needs_swap)
+				word32 = bswap_32(word32);
+			set = (word32 & (1U << bit_in_word)) != 0;
+		}
+
+		if (set) {
+			int host_w_idx = bit_idx / BITS_PER_LONG;
+			int host_bit_in_word = bit_idx % BITS_PER_LONG;
+			mask[host_w_idx] |= (1UL << host_bit_in_word);
+		}
+	}
+
+	*len_out = len;
+	return mask;
+}
+
+u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
+			 bool needs_swap)
+{
+	u64 value;
+	void *ptr = sample->raw_data + field->offset;
+
+	if (out_of_bounds(field, field->offset, field->size, sample->raw_size))
+		return 0;
+
+	switch (field->size) {
+	case 1:
+		return *(u8 *)ptr;
+	case 2:
+		value = *(u16 *)ptr;
+		break;
+	case 4:
+		value = *(u32 *)ptr;
+		break;
+	case 8:
+		memcpy(&value, ptr, sizeof(u64));
+		break;
+	default:
+		return 0;
+	}
+
+	if (!needs_swap)
+		return value;
+
+	switch (field->size) {
+	case 2:
+		return bswap_16(value);
+	case 4:
+		return bswap_32(value);
+	case 8:
+		return bswap_64(value);
+	default:
+		return 0;
+	}
+
+	return 0;
+}
+
+u64 perf_sample__intval(struct perf_sample *sample, const char *name)
+{
+	struct tep_format_field *field = evsel__field(sample->evsel, name);
+
+	return field ? format_field__intval(field, sample, sample->evsel->needs_swap) : 0;
+}
+
+u64 perf_sample__intval_common(struct perf_sample *sample, const char *name)
+{
+	struct tep_format_field *field = evsel__common_field(sample->evsel, name);
+
+	return field ? format_field__intval(field, sample, sample->evsel->needs_swap) : 0;
+}
+
+char perf_sample__taskstate(struct perf_sample *sample, const char *name)
+{
+	static struct tep_format_field *prev_state_field;
+	static const char *states;
+	struct tep_format_field *field;
+	unsigned long long val;
+	unsigned int bit;
+	char state = '?'; /* '?' denotes unknown task state */
+
+	field = evsel__field(sample->evsel, name);
+
+	if (!field)
+		return state;
+
+	if (!states || field != prev_state_field) {
+		states = parse_task_states(field);
+		if (!states)
+			return state;
+		prev_state_field = field;
+	}
+
+	/*
+	 * Note since the kernel exposes TASK_REPORT_MAX to userspace
+	 * to denote the 'preempted' state, we might as welll report
+	 * 'R' for this case, which make senses to users as well.
+	 *
+	 * We can change this if we have a good reason in the future.
+	 */
+	val = perf_sample__intval(sample, name);
+	bit = val ? ffs(val) : 0;
+	state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1];
+	return state;
+}
+#endif
+
+bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
+		     char *msg, size_t msgsize)
+{
+	int paranoid;
+
+	if ((err == ENODEV || err == ENOENT || err == ENXIO) &&
+	    evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
+		/*
+		 * If it's the legacy hardware cycles event fails then fall back
+		 * to hrtimer based cpu-clock sw counter, which is always
+		 * available even if no PMU support. PPC returned ENXIO rather
+		 * than ENODEV or ENOENT until 2.6.37.
+		 */
+		evsel->pmu = perf_pmus__find_by_type(PERF_TYPE_SOFTWARE);
+		assert(evsel->pmu); /* software is a "well-known" and can't fail PMU type. */
+
+		/* Configure the event. */
+		evsel->core.attr.type = PERF_TYPE_SOFTWARE;
+		evsel->core.attr.config = target__has_cpu(target)
+			? PERF_COUNT_SW_CPU_CLOCK
+			: PERF_COUNT_SW_TASK_CLOCK;
+		evsel->core.is_pmu_core = false;
+
+		/* Remove excludes for new event. */
+		if (evsel->fallenback_eacces) {
+			evsel->core.attr.exclude_kernel = 0;
+			evsel->core.attr.exclude_hv     = 0;
+			evsel->fallenback_eacces = false;
+		}
+		if (evsel->fallenback_eopnotsupp) {
+			evsel->core.attr.exclude_guest = 0;
+			evsel->fallenback_eopnotsupp = false;
+		}
+
+		/* Name is recomputed by evsel__name. */
+		zfree(&evsel->name);
+
+		/* Log message. */
+		scnprintf(msg, msgsize,
+			  "The cycles event is not supported, trying to fall back to %s",
+			  evsel__name(evsel));
+		return true;
+	} else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
+		   (paranoid = perf_event_paranoid()) > 1) {
+		const char *name = evsel__name(evsel);
+		char *new_name;
+		const char *sep = ":";
+
+		/* If event has exclude user then don't exclude kernel. */
+		if (evsel->core.attr.exclude_user)
+			goto no_fallback;
+
+		/* Is there already the separator in the name. */
+		if (strchr(name, '/') ||
+		    (strchr(name, ':') && !evsel->is_libpfm_event))
+			sep = "";
+
+		if (asprintf(&new_name, "%s%su", name, sep) < 0)
+			goto no_fallback;
+
+		free(evsel->name);
+		evsel->name = new_name;
+		scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
+			  "to fall back to excluding kernel and hypervisor "
+			  " samples", paranoid);
+		evsel->core.attr.exclude_kernel = 1;
+		evsel->core.attr.exclude_hv     = 1;
+		evsel->fallenback_eacces = true;
+		return true;
+	} else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest &&
+		   !evsel->exclude_GH) {
+		const char *name = evsel__name(evsel);
+		char *new_name;
+		const char *sep = ":";
+
+		/* Is there already the separator in the name. */
+		if (strchr(name, '/') ||
+		    (strchr(name, ':') && !evsel->is_libpfm_event))
+			sep = "";
+
+		if (asprintf(&new_name, "%s%sH", name, sep) < 0)
+			goto no_fallback;
+
+		free(evsel->name);
+		evsel->name = new_name;
+		/* Apple M1 requires exclude_guest */
+		scnprintf(msg, msgsize, "Trying to fall back to excluding guest samples");
+		evsel->core.attr.exclude_guest = 1;
+		evsel->fallenback_eopnotsupp = true;
+		return true;
+	}
+no_fallback:
+	scnprintf(msg, msgsize, "No fallback found for '%s' for error %d",
+		  evsel__name(evsel), err);
+	return false;
+}
+
+static bool find_process(const char *name)
+{
+	size_t len = strlen(name);
+	DIR *dir;
+	struct dirent *d;
+	int ret = -1;
+
+	dir = opendir(procfs__mountpoint());
+	if (!dir)
+		return false;
+
+	/* Walk through the directory. */
+	while (ret && (d = readdir(dir)) != NULL) {
+		char path[PATH_MAX];
+		char *data;
+		size_t size;
+
+		if ((d->d_type != DT_DIR) ||
+		     !strcmp(".", d->d_name) ||
+		     !strcmp("..", d->d_name))
+			continue;
+
+		scnprintf(path, sizeof(path), "%s/%s/comm",
+			  procfs__mountpoint(), d->d_name);
+
+		if (filename__read_str(path, &data, &size))
+			continue;
+
+		ret = strncmp(name, data, len);
+		free(data);
+	}
+
+	closedir(dir);
+	return ret ? false : true;
+}
+
+static int dump_perf_event_processes(char *msg, size_t size)
+{
+	DIR *proc_dir;
+	struct dirent *proc_entry;
+	int printed = 0;
+
+	proc_dir = opendir(procfs__mountpoint());
+	if (!proc_dir)
+		return 0;
+
+	/* Walk through the /proc directory. */
+	while ((proc_entry = readdir(proc_dir)) != NULL) {
+		char buf[256];
+		DIR *fd_dir;
+		struct dirent *fd_entry;
+		int fd_dir_fd;
+
+		if (proc_entry->d_type != DT_DIR ||
+		    !isdigit(proc_entry->d_name[0]) ||
+		    strlen(proc_entry->d_name) > sizeof(buf) - 4)
+			continue;
+
+		scnprintf(buf, sizeof(buf), "%s/fd", proc_entry->d_name);
+		fd_dir_fd = openat(dirfd(proc_dir), buf, O_DIRECTORY);
+		if (fd_dir_fd == -1)
+			continue;
+		fd_dir = fdopendir(fd_dir_fd);
+		if (!fd_dir) {
+			close(fd_dir_fd);
+			continue;
+		}
+		while ((fd_entry = readdir(fd_dir)) != NULL) {
+			ssize_t link_size;
+
+			if (fd_entry->d_type != DT_LNK)
+				continue;
+			link_size = readlinkat(fd_dir_fd, fd_entry->d_name, buf, sizeof(buf));
+			if (link_size < 0)
+				continue;
+			/* Take care as readlink doesn't null terminate the string. */
+			if (!strncmp(buf, "anon_inode:[perf_event]", link_size)) {
+				int cmdline_fd;
+				ssize_t cmdline_size;
+
+				scnprintf(buf, sizeof(buf), "%s/cmdline", proc_entry->d_name);
+				cmdline_fd = openat(dirfd(proc_dir), buf, O_RDONLY);
+				if (cmdline_fd == -1)
+					continue;
+				cmdline_size = read(cmdline_fd, buf, sizeof(buf) - 1);
+				close(cmdline_fd);
+				if (cmdline_size < 0)
+					continue;
+				buf[cmdline_size] = '\0';
+				for (ssize_t i = 0; i < cmdline_size; i++) {
+					if (buf[i] == '\0')
+						buf[i] = ' ';
+				}
+
+				if (printed == 0)
+					printed += scnprintf(msg, size, "Possible processes:\n");
+
+				printed += scnprintf(msg + printed, size - printed,
+						"%s %s\n", proc_entry->d_name, buf);
+				break;
+			}
+		}
+		closedir(fd_dir);
+	}
+	closedir(proc_dir);
+	return printed;
+}
+
+int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused,
+				     int err __maybe_unused,
+				     char *msg __maybe_unused,
+				     size_t size __maybe_unused)
+{
+	return 0;
+}
+
+int evsel__open_strerror(struct evsel *evsel, struct target *target,
+			 int err, char *msg, size_t size)
+{
+	struct perf_pmu *pmu;
+	int printed = 0, enforced = 0;
+	int ret;
+
+	switch (err) {
+	case EPERM:
+	case EACCES:
+		printed += scnprintf(msg + printed, size - printed,
+			"Access to performance monitoring and observability operations is limited.\n");
+
+		if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
+			if (enforced) {
+				printed += scnprintf(msg + printed, size - printed,
+					"Enforced MAC policy settings (SELinux) can limit access to performance\n"
+					"monitoring and observability operations. Inspect system audit records for\n"
+					"more perf_event access control information and adjusting the policy.\n");
+			}
+		}
+
+		if (err == EPERM)
+			printed += scnprintf(msg, size,
+				"No permission to enable %s event.\n\n", evsel__name(evsel));
+
+		return printed + scnprintf(msg + printed, size - printed,
+		 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
+		 "access to performance monitoring and observability operations for processes\n"
+		 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
+		 "More information can be found at 'Perf events and tool security' document:\n"
+		 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
+		 "perf_event_paranoid setting is %d:\n"
+		 "  -1: Allow use of (almost) all events by all users\n"
+		 "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
+		 ">= 0: Disallow raw and ftrace function tracepoint access\n"
+		 ">= 1: Disallow CPU event access\n"
+		 ">= 2: Disallow kernel profiling\n"
+		 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
+		 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
+		 perf_event_paranoid());
+	case ENOENT:
+		return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
+	case EMFILE:
+		return scnprintf(msg, size, "%s",
+			 "Too many events are opened.\n"
+			 "Probably the maximum number of open file descriptors has been reached.\n"
+			 "Hint: Try again after reducing the number of events.\n"
+			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
+	case ENOMEM:
+		if (evsel__has_callchain(evsel) &&
+		    access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
+			return scnprintf(msg, size,
+					 "Not enough memory to setup event with callchain.\n"
+					 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
+					 "Hint: Current value: %d", sysctl__max_stack());
+		break;
+	case ENODEV:
+		if (target->cpu_list)
+			return scnprintf(msg, size, "%s",
+	 "No such device - did you specify an out-of-range profile CPU?");
+		break;
+	case EOPNOTSUPP:
+		if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)
+			return scnprintf(msg, size,
+	"%s: PMU Hardware or event type doesn't support branch stack sampling.",
+					 evsel__name(evsel));
+		if (evsel->core.attr.aux_output)
+			return scnprintf(msg, size,
+	"%s: PMU Hardware doesn't support 'aux_output' feature",
+					 evsel__name(evsel));
+		if (evsel->core.attr.aux_action)
+			return scnprintf(msg, size,
+	"%s: PMU Hardware doesn't support 'aux_action' feature",
+					evsel__name(evsel));
+		if (evsel->core.attr.sample_period != 0)
+			return scnprintf(msg, size,
+	"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
+					 evsel__name(evsel));
+		if (evsel->core.attr.precise_ip)
+			return scnprintf(msg, size, "%s",
+	"\'precise\' request may not be supported. Try removing 'p' modifier.");
+#if defined(__i386__) || defined(__x86_64__)
+		if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
+			return scnprintf(msg, size, "%s",
+	"No hardware sampling interrupt available.\n");
+#endif
+		if (!target__has_cpu(target))
+			return scnprintf(msg, size,
+	"Unsupported event (%s) in per-thread mode, enable system wide with '-a'.",
+					evsel__name(evsel));
+		break;
+	case EBUSY:
+		if (find_process("oprofiled"))
+			return scnprintf(msg, size,
+	"The PMU counters are busy/taken by another profiler.\n"
+	"We found oprofile daemon running, please stop it and try again.");
+		printed += scnprintf(
+			msg, size,
+			"The PMU %s counters are busy and in use by another process.\n",
+			evsel->pmu ? evsel->pmu->name : "");
+		return printed + dump_perf_event_processes(msg + printed, size - printed);
+		break;
+	case EINVAL:
+		if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
+			return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
+		if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
+			return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
+		if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
+			return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
+		if (perf_missing_features.clockid)
+			return scnprintf(msg, size, "clockid feature not supported.");
+		if (perf_missing_features.clockid_wrong)
+			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
+		if (perf_missing_features.aux_action)
+			return scnprintf(msg, size, "The 'aux_action' feature is not supported, update the kernel.");
+		if (perf_missing_features.aux_output)
+			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
+		pmu = evsel__find_pmu(evsel);
+		if (!pmu->is_core && !target__has_cpu(target))
+			return scnprintf(msg, size,
+	"Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
+					evsel__name(evsel));
+
+		break;
+	case ENODATA:
+		return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
+				 "Please add an auxiliary event in front of the load latency event.");
+	default:
+		break;
+	}
+
+	ret = arch_evsel__open_strerror(evsel, err, msg, size);
+	if (ret)
+		return ret;
+
+	errno = err;
+	return scnprintf(msg, size,
+			 "The sys_perf_event_open() syscall failed for event (%s): %m\n"
+			 "\"dmesg | grep -i perf\" may provide additional information.\n",
+			 evsel__name(evsel));
+}
+
+struct perf_session *evsel__session(struct evsel *evsel)
+{
+	return evsel && evsel->evlist ? evlist__session(evsel->evlist) : NULL;
+}
+
+struct perf_env *evsel__env(struct evsel *evsel)
+{
+	struct perf_session *session = evsel__session(evsel);
+
+	return session ? perf_session__env(session) : NULL;
+}
+
+static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
+{
+	int cpu_map_idx, thread;
+
+	if (evsel__is_retire_lat(evsel))
+		return 0;
+
+	if (perf_pmu__kind(evsel->pmu) != PERF_PMU_KIND_PE)
+		return 0;
+
+	for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
+		for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
+		     thread++) {
+			int fd = FD(evsel, cpu_map_idx, thread);
+
+			if (perf_evlist__id_add_fd(evlist__core(evlist), &evsel->core,
+						   cpu_map_idx, thread, fd) < 0)
+				return -1;
+		}
+	}
+
+	return 0;
+}
+
+int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
+{
+	struct perf_cpu_map *cpus = evsel->core.cpus;
+	struct perf_thread_map *threads = evsel->core.threads;
+
+	if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr))
+		return -ENOMEM;
+
+	return store_evsel_ids(evsel, evlist);
+}
+
+void evsel__zero_per_pkg(struct evsel *evsel)
+{
+	struct hashmap_entry *cur;
+	size_t bkt;
+
+	if (evsel->per_pkg_mask) {
+		hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
+			zfree(&cur->pkey);
+
+		hashmap__clear(evsel->per_pkg_mask);
+	}
+}
+
+/**
+ * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this
+ *                    will be false on hybrid systems for hardware and legacy
+ *                    cache events.
+ */
+bool evsel__is_hybrid(const struct evsel *evsel)
+{
+	if (!evsel->core.is_pmu_core)
+		return false;
+
+	return perf_pmus__num_core_pmus() > 1;
+}
+
+struct evsel *evsel__leader(const struct evsel *evsel)
+{
+	if (evsel->core.leader == NULL)
+		return NULL;
+	return container_of(evsel->core.leader, struct evsel, core);
+}
+
+bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
+{
+	return evsel->core.leader == &leader->core;
+}
+
+bool evsel__is_leader(struct evsel *evsel)
+{
+	return evsel__has_leader(evsel, evsel);
+}
+
+void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
+{
+	evsel->core.leader = &leader->core;
+}
+
+bool evsel__is_aux_event(const struct evsel *evsel)
+{
+	struct perf_pmu *pmu;
+
+	if (evsel->needs_auxtrace_mmap)
+		return true;
+
+	pmu = evsel__find_pmu(evsel);
+	return pmu && pmu->auxtrace;
+}
+
+int evsel__source_count(const struct evsel *evsel)
+{
+	struct evsel *pos;
+	int count = 0;
+
+	evlist__for_each_entry(evsel->evlist, pos) {
+		if (pos->metric_leader == evsel)
+			count++;
+	}
+	return count;
+}
+
+bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused)
+{
+	return false;
+}
+
+/*
+ * Remove an event from a given group (leader).
+ * Some events, e.g., perf metrics Topdown events,
+ * must always be grouped. Ignore the events.
+ */
+void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader)
+{
+	if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) {
+		evsel__set_leader(evsel, evsel);
+		evsel->core.nr_members = 0;
+		leader->core.nr_members--;
+	}
+}
+
+bool evsel__set_needs_uniquify(struct evsel *counter, const struct perf_stat_config *config)
+{
+	struct evsel *evsel;
+
+	if (counter->needs_uniquify) {
+		/* Already set. */
+		return true;
+	}
+
+	if (counter->use_config_name || counter->is_libpfm_event) {
+		/* Original name will be used. */
+		return false;
+	}
+
+	if (!config->hybrid_merge && evsel__is_hybrid(counter)) {
+		/* Unique hybrid counters necessary. */
+		counter->needs_uniquify = true;
+		return true;
+	}
+
+	if  (counter->core.attr.type < PERF_TYPE_MAX && counter->core.attr.type != PERF_TYPE_RAW) {
+		/* Legacy event, don't uniquify. */
+		return false;
+	}
+
+	if (counter->pmu && counter->pmu->is_core &&
+	    counter->alternate_hw_config != PERF_COUNT_HW_MAX) {
+		/* A sysfs or json event replacing a legacy event, don't uniquify. */
+		return false;
+	}
+
+	if (config->aggr_mode == AGGR_NONE) {
+		/* Always unique with no aggregation. */
+		counter->needs_uniquify = true;
+		return true;
+	}
+
+	if (counter->first_wildcard_match != NULL) {
+		/*
+		 * If stats are merged then only the first_wildcard_match is
+		 * displayed, there is no need to uniquify this evsel as the
+		 * name won't be shown.
+		 */
+		return false;
+	}
+
+	/*
+	 * Do other non-merged events in the evlist have the same name? If so
+	 * uniquify is necessary.
+	 */
+	evlist__for_each_entry(counter->evlist, evsel) {
+		if (evsel == counter || evsel->first_wildcard_match || evsel->pmu == counter->pmu)
+			continue;
+
+		if (evsel__name_is(counter, evsel__name(evsel))) {
+			counter->needs_uniquify = true;
+			return true;
+		}
+	}
+	return false;
+}
+
+void evsel__uniquify_counter(struct evsel *counter)
+{
+	const char *name, *pmu_name, *config;
+	char *new_name;
+	int len, ret;
+
+	/* No uniquification necessary. */
+	if (!counter->needs_uniquify)
+		return;
+
+	/* The evsel was already uniquified. */
+	if (counter->uniquified_name)
+		return;
+
+	/* Avoid checking to uniquify twice. */
+	counter->uniquified_name = true;
+
+	name = evsel__name(counter);
+	config = strchr(name, '/');
+	pmu_name = counter->pmu->name;
+
+	/* Already prefixed by the PMU name? */
+	len = pmu_name_len_no_suffix(pmu_name);
+
+	if (!strncmp(name, pmu_name, len)) {
+		/*
+		 * If the PMU name is there, then there is no sense in not
+		 * having a slash. Do this for robustness.
+		 */
+		if (config == NULL)
+			config = name - 1;
+
+		ret = asprintf(&new_name, "%s/%s", pmu_name, config + 1);
+	} else if (config) {
+		len = config - name;
+		if (config[1] == '/') {
+			/* case: event// */
+			ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 2);
+		} else {
+			/* case: event/.../ */
+			ret = asprintf(&new_name, "%s/%.*s,%s", pmu_name, len, name, config + 1);
+		}
+	} else {
+		config = strchr(name, ':');
+		if (config) {
+			/* case: event:.. */
+			len = config - name;
+
+			ret = asprintf(&new_name, "%s/%.*s/%s", pmu_name, len, name, config + 1);
+		} else {
+			/* case: event */
+			ret = asprintf(&new_name, "%s/%s/", pmu_name, name);
+		}
+	}
+	if (ret > 0) {
+		free(counter->name);
+		counter->name = new_name;
+	} else {
+		/* ENOMEM from asprintf. */
+		counter->uniquified_name = false;
+	}
+}
+
+void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus)
+{
+	struct perf_cpu_map *intersect, *online = NULL;
+	const struct perf_pmu *pmu = evsel__find_pmu(evsel);
+
+	if (pmu && pmu->is_core) {
+		intersect = perf_cpu_map__intersect(pmu->cpus, user_requested_cpus);
+	} else {
+		online = cpu_map__online();
+		intersect = perf_cpu_map__intersect(online, user_requested_cpus);
+	}
+	if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
+		char buf1[128];
+		char buf2[128];
+
+		cpu_map__snprint(user_requested_cpus, buf1, sizeof(buf1));
+		cpu_map__snprint(online ?: pmu->cpus, buf2, sizeof(buf2));
+		pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
+			   buf1, pmu ? pmu->name : "cpu", buf2, evsel__name(evsel));
+	}
+	perf_cpu_map__put(intersect);
+	perf_cpu_map__put(online);
+}