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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * auxtrace.c: AUX area trace support
  * Copyright (c) 2013-2015, Intel Corporation.
  */
 
 #include <inttypes.h>
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <stdbool.h>
 #include <string.h>
 #include <limits.h>
 #include <errno.h>
 
 #include <linux/kernel.h>
 #include <linux/perf_event.h>
 #include <linux/types.h>
 #include <linux/bitops.h>
 #include <linux/log2.h>
 #include <linux/string.h>
 #include <linux/time64.h>
 
 #include <sys/param.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <linux/list.h>
 #include <linux/zalloc.h>
 
 #include "evlist.h"
 #include "dso.h"
 #include "map.h"
 #include "pmu.h"
 #include "evsel.h"
 #include "evsel_config.h"
 #include "symbol.h"
 #include "util/perf_api_probe.h"
 #include "util/synthetic-events.h"
 #include "thread_map.h"
 #include "asm/bug.h"
 #include "auxtrace.h"
 
 #include <linux/hash.h>
 
 #include "event.h"
 #include "record.h"
 #include "session.h"
 #include "debug.h"
 #include <subcmd/parse-options.h>
 
 #include "cs-etm.h"
 #include "intel-pt.h"
 #include "intel-bts.h"
 #include "arm-spe.h"
 #include "s390-cpumsf.h"
 #include "util/mmap.h"
 
 #include <linux/ctype.h>
 #include "symbol/kallsyms.h"
 #include <internal/lib.h>
 
 /*
  * Make a group from 'leader' to 'last', requiring that the events were not
  * already grouped to a different leader.
  */
 static int evlist__regroup(struct evlist *evlist, struct evsel *leader, struct evsel *last)
 {
     struct evsel *evsel;
     bool grp;
 
     if (!evsel__is_group_leader(leader))
         return -EINVAL;
 
     grp = false;
     evlist__for_each_entry(evlist, evsel) {
         if (grp) {
             if (!(evsel__leader(evsel) == leader ||
                  (evsel__leader(evsel) == evsel &&
                   evsel->core.nr_members <= 1)))
                 return -EINVAL;
         } else if (evsel == leader) {
             grp = true;
         }
         if (evsel == last)
             break;
     }
 
     grp = false;
     evlist__for_each_entry(evlist, evsel) {
         if (grp) {
             if (!evsel__has_leader(evsel, leader)) {
                 evsel__set_leader(evsel, leader);
                 if (leader->core.nr_members < 1)
                     leader->core.nr_members = 1;
                 leader->core.nr_members += 1;
             }
         } else if (evsel == leader) {
             grp = true;
         }
         if (evsel == last)
             break;
     }
 
     return 0;
 }
 
 static bool auxtrace__dont_decode(struct perf_session *session)
 {
     return !session->itrace_synth_opts ||
            session->itrace_synth_opts->dont_decode;
 }
 
 int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
             struct auxtrace_mmap_params *mp,
             void *userpg, int fd)
 {
     struct perf_event_mmap_page *pc = userpg;
 
     WARN_ONCE(mm->base, "Uninitialized auxtrace_mmap\n");
 
     mm->userpg = userpg;
     mm->mask = mp->mask;
     mm->len = mp->len;
     mm->prev = 0;
     mm->idx = mp->idx;
     mm->tid = mp->tid;
     mm->cpu = mp->cpu.cpu;
 
     if (!mp->len || !mp->mmap_needed) {
         mm->base = NULL;
         return 0;
     }
 
     pc->aux_offset = mp->offset;
     pc->aux_size = mp->len;
 
     mm->base = mmap(NULL, mp->len, mp->prot, MAP_SHARED, fd, mp->offset);
     if (mm->base == MAP_FAILED) {
         pr_debug2("failed to mmap AUX area\n");
         mm->base = NULL;
         return -1;
     }
 
     return 0;
 }
 
 void auxtrace_mmap__munmap(struct auxtrace_mmap *mm)
 {
     if (mm->base) {
         munmap(mm->base, mm->len);
         mm->base = NULL;
     }
 }
 
 void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
                 off_t auxtrace_offset,
                 unsigned int auxtrace_pages,
                 bool auxtrace_overwrite)
 {
     if (auxtrace_pages) {
         mp->offset = auxtrace_offset;
         mp->len = auxtrace_pages * (size_t)page_size;
         mp->mask = is_power_of_2(mp->len) ? mp->len - 1 : 0;
         mp->prot = PROT_READ | (auxtrace_overwrite ? 0 : PROT_WRITE);
         pr_debug2("AUX area mmap length %zu\n", mp->len);
     } else {
         mp->len = 0;
     }
 }
 
 void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
                    struct evlist *evlist,
                    struct evsel *evsel, int idx)
 {
     bool per_cpu = !perf_cpu_map__empty(evlist->core.user_requested_cpus);
 
     mp->mmap_needed = evsel->needs_auxtrace_mmap;
 
     if (!mp->mmap_needed)
         return;
 
     mp->idx = idx;
 
     if (per_cpu) {
         mp->cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
         if (evlist->core.threads)
             mp->tid = perf_thread_map__pid(evlist->core.threads, 0);
         else
             mp->tid = -1;
     } else {
         mp->cpu.cpu = -1;
         mp->tid = perf_thread_map__pid(evlist->core.threads, idx);
     }
 }
 
 #define AUXTRACE_INIT_NR_QUEUES 32
 
 static struct auxtrace_queue *auxtrace_alloc_queue_array(unsigned int nr_queues)
 {
     struct auxtrace_queue *queue_array;
     unsigned int max_nr_queues, i;
 
     max_nr_queues = UINT_MAX / sizeof(struct auxtrace_queue);
     if (nr_queues > max_nr_queues)
         return NULL;
 
     queue_array = calloc(nr_queues, sizeof(struct auxtrace_queue));
     if (!queue_array)
         return NULL;
 
     for (i = 0; i < nr_queues; i++) {
         INIT_LIST_HEAD(&queue_array[i].head);
         queue_array[i].priv = NULL;
     }
 
     return queue_array;
 }
 
 int auxtrace_queues__init(struct auxtrace_queues *queues)
 {
     queues->nr_queues = AUXTRACE_INIT_NR_QUEUES;
     queues->queue_array = auxtrace_alloc_queue_array(queues->nr_queues);
     if (!queues->queue_array)
         return -ENOMEM;
     return 0;
 }
 
 static int auxtrace_queues__grow(struct auxtrace_queues *queues,
                  unsigned int new_nr_queues)
 {
     unsigned int nr_queues = queues->nr_queues;
     struct auxtrace_queue *queue_array;
     unsigned int i;
 
     if (!nr_queues)
         nr_queues = AUXTRACE_INIT_NR_QUEUES;
 
     while (nr_queues && nr_queues < new_nr_queues)
         nr_queues <<= 1;
 
     if (nr_queues < queues->nr_queues || nr_queues < new_nr_queues)
         return -EINVAL;
 
     queue_array = auxtrace_alloc_queue_array(nr_queues);
     if (!queue_array)
         return -ENOMEM;
 
     for (i = 0; i < queues->nr_queues; i++) {
         list_splice_tail(&queues->queue_array[i].head,
                  &queue_array[i].head);
         queue_array[i].tid = queues->queue_array[i].tid;
         queue_array[i].cpu = queues->queue_array[i].cpu;
         queue_array[i].set = queues->queue_array[i].set;
         queue_array[i].priv = queues->queue_array[i].priv;
     }
 
     queues->nr_queues = nr_queues;
     queues->queue_array = queue_array;
 
     return 0;
 }
 
 static void *auxtrace_copy_data(u64 size, struct perf_session *session)
 {
     int fd = perf_data__fd(session->data);
     void *p;
     ssize_t ret;
 
     if (size > SSIZE_MAX)
         return NULL;
 
     p = malloc(size);
     if (!p)
         return NULL;
 
     ret = readn(fd, p, size);
     if (ret != (ssize_t)size) {
         free(p);
         return NULL;
     }
 
     return p;
 }
 
 static int auxtrace_queues__queue_buffer(struct auxtrace_queues *queues,
                      unsigned int idx,
                      struct auxtrace_buffer *buffer)
 {
     struct auxtrace_queue *queue;
     int err;
 
     if (idx >= queues->nr_queues) {
         err = auxtrace_queues__grow(queues, idx + 1);
         if (err)
             return err;
     }
 
     queue = &queues->queue_array[idx];
 
     if (!queue->set) {
         queue->set = true;
         queue->tid = buffer->tid;
         queue->cpu = buffer->cpu.cpu;
     }
 
     buffer->buffer_nr = queues->next_buffer_nr++;
 
     list_add_tail(&buffer->list, &queue->head);
 
     queues->new_data = true;
     queues->populated = true;
 
     return 0;
 }
 
 /* Limit buffers to 32MiB on 32-bit */
 #define BUFFER_LIMIT_FOR_32_BIT (32 * 1024 * 1024)
 
 static int auxtrace_queues__split_buffer(struct auxtrace_queues *queues,
                      unsigned int idx,
                      struct auxtrace_buffer *buffer)
 {
     u64 sz = buffer->size;
     bool consecutive = false;
     struct auxtrace_buffer *b;
     int err;
 
     while (sz > BUFFER_LIMIT_FOR_32_BIT) {
         b = memdup(buffer, sizeof(struct auxtrace_buffer));
         if (!b)
             return -ENOMEM;
         b->size = BUFFER_LIMIT_FOR_32_BIT;
         b->consecutive = consecutive;
         err = auxtrace_queues__queue_buffer(queues, idx, b);
         if (err) {
             auxtrace_buffer__free(b);
             return err;
         }
         buffer->data_offset += BUFFER_LIMIT_FOR_32_BIT;
         sz -= BUFFER_LIMIT_FOR_32_BIT;
         consecutive = true;
     }
 
     buffer->size = sz;
     buffer->consecutive = consecutive;
 
     return 0;
 }
 
 static bool filter_cpu(struct perf_session *session, struct perf_cpu cpu)
 {
     unsigned long *cpu_bitmap = session->itrace_synth_opts->cpu_bitmap;
 
     return cpu_bitmap && cpu.cpu != -1 && !test_bit(cpu.cpu, cpu_bitmap);
 }
 
 static int auxtrace_queues__add_buffer(struct auxtrace_queues *queues,
                        struct perf_session *session,
                        unsigned int idx,
                        struct auxtrace_buffer *buffer,
                        struct auxtrace_buffer **buffer_ptr)
 {
     int err = -ENOMEM;
 
     if (filter_cpu(session, buffer->cpu))
         return 0;
 
     buffer = memdup(buffer, sizeof(*buffer));
     if (!buffer)
         return -ENOMEM;
 
     if (session->one_mmap) {
         buffer->data = buffer->data_offset - session->one_mmap_offset +
                    session->one_mmap_addr;
     } else if (perf_data__is_pipe(session->data)) {
         buffer->data = auxtrace_copy_data(buffer->size, session);
         if (!buffer->data)
             goto out_free;
         buffer->data_needs_freeing = true;
     } else if (BITS_PER_LONG == 32 &&
            buffer->size > BUFFER_LIMIT_FOR_32_BIT) {
         err = auxtrace_queues__split_buffer(queues, idx, buffer);
         if (err)
             goto out_free;
     }
 
     err = auxtrace_queues__queue_buffer(queues, idx, buffer);
     if (err)
         goto out_free;
 
     /* FIXME: Doesn't work for split buffer */
     if (buffer_ptr)
         *buffer_ptr = buffer;
 
     return 0;
 
 out_free:
     auxtrace_buffer__free(buffer);
     return err;
 }
 
 int auxtrace_queues__add_event(struct auxtrace_queues *queues,
                    struct perf_session *session,
                    union perf_event *event, off_t data_offset,
                    struct auxtrace_buffer **buffer_ptr)
 {
     struct auxtrace_buffer buffer = {
         .pid = -1,
         .tid = event->auxtrace.tid,
         .cpu = { event->auxtrace.cpu },
         .data_offset = data_offset,
         .offset = event->auxtrace.offset,
         .reference = event->auxtrace.reference,
         .size = event->auxtrace.size,
     };
     unsigned int idx = event->auxtrace.idx;
 
     return auxtrace_queues__add_buffer(queues, session, idx, &buffer,
                        buffer_ptr);
 }
 
 static int auxtrace_queues__add_indexed_event(struct auxtrace_queues *queues,
                           struct perf_session *session,
                           off_t file_offset, size_t sz)
 {
     union perf_event *event;
     int err;
     char buf[PERF_SAMPLE_MAX_SIZE];
 
     err = perf_session__peek_event(session, file_offset, buf,
                        PERF_SAMPLE_MAX_SIZE, &event, NULL);
     if (err)
         return err;
 
     if (event->header.type == PERF_RECORD_AUXTRACE) {
         if (event->header.size < sizeof(struct perf_record_auxtrace) ||
             event->header.size != sz) {
             err = -EINVAL;
             goto out;
         }
         file_offset += event->header.size;
         err = auxtrace_queues__add_event(queues, session, event,
                          file_offset, NULL);
     }
 out:
     return err;
 }
 
 void auxtrace_queues__free(struct auxtrace_queues *queues)
 {
     unsigned int i;
 
     for (i = 0; i < queues->nr_queues; i++) {
         while (!list_empty(&queues->queue_array[i].head)) {
             struct auxtrace_buffer *buffer;
 
             buffer = list_entry(queues->queue_array[i].head.next,
                         struct auxtrace_buffer, list);
             list_del_init(&buffer->list);
             auxtrace_buffer__free(buffer);
         }
     }
 
     zfree(&queues->queue_array);
     queues->nr_queues = 0;
 }
 
 static void auxtrace_heapify(struct auxtrace_heap_item *heap_array,
                  unsigned int pos, unsigned int queue_nr,
                  u64 ordinal)
 {
     unsigned int parent;
 
     while (pos) {
         parent = (pos - 1) >> 1;
         if (heap_array[parent].ordinal <= ordinal)
             break;
         heap_array[pos] = heap_array[parent];
         pos = parent;
     }
     heap_array[pos].queue_nr = queue_nr;
     heap_array[pos].ordinal = ordinal;
 }
 
 int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
                u64 ordinal)
 {
     struct auxtrace_heap_item *heap_array;
 
     if (queue_nr >= heap->heap_sz) {
         unsigned int heap_sz = AUXTRACE_INIT_NR_QUEUES;
 
         while (heap_sz <= queue_nr)
             heap_sz <<= 1;
         heap_array = realloc(heap->heap_array,
                      heap_sz * sizeof(struct auxtrace_heap_item));
         if (!heap_array)
             return -ENOMEM;
         heap->heap_array = heap_array;
         heap->heap_sz = heap_sz;
     }
 
     auxtrace_heapify(heap->heap_array, heap->heap_cnt++, queue_nr, ordinal);
 
     return 0;
 }
 
 void auxtrace_heap__free(struct auxtrace_heap *heap)
 {
     zfree(&heap->heap_array);
     heap->heap_cnt = 0;
     heap->heap_sz = 0;
 }
 
 void auxtrace_heap__pop(struct auxtrace_heap *heap)
 {
     unsigned int pos, last, heap_cnt = heap->heap_cnt;
     struct auxtrace_heap_item *heap_array;
 
     if (!heap_cnt)
         return;
 
     heap->heap_cnt -= 1;
 
     heap_array = heap->heap_array;
 
     pos = 0;
     while (1) {
         unsigned int left, right;
 
         left = (pos << 1) + 1;
         if (left >= heap_cnt)
             break;
         right = left + 1;
         if (right >= heap_cnt) {
             heap_array[pos] = heap_array[left];
             return;
         }
         if (heap_array[left].ordinal < heap_array[right].ordinal) {
             heap_array[pos] = heap_array[left];
             pos = left;
         } else {
             heap_array[pos] = heap_array[right];
             pos = right;
         }
     }
 
     last = heap_cnt - 1;
     auxtrace_heapify(heap_array, pos, heap_array[last].queue_nr,
              heap_array[last].ordinal);
 }
 
 size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr,
                        struct evlist *evlist)
 {
     if (itr)
         return itr->info_priv_size(itr, evlist);
     return 0;
 }
 
 static int auxtrace_not_supported(void)
 {
     pr_err("AUX area tracing is not supported on this architecture\n");
     return -EINVAL;
 }
 
 int auxtrace_record__info_fill(struct auxtrace_record *itr,
                    struct perf_session *session,
                    struct perf_record_auxtrace_info *auxtrace_info,
                    size_t priv_size)
 {
     if (itr)
         return itr->info_fill(itr, session, auxtrace_info, priv_size);
     return auxtrace_not_supported();
 }
 
 void auxtrace_record__free(struct auxtrace_record *itr)
 {
     if (itr)
         itr->free(itr);
 }
 
 int auxtrace_record__snapshot_start(struct auxtrace_record *itr)
 {
     if (itr && itr->snapshot_start)
         return itr->snapshot_start(itr);
     return 0;
 }
 
 int auxtrace_record__snapshot_finish(struct auxtrace_record *itr, bool on_exit)
 {
     if (!on_exit && itr && itr->snapshot_finish)
         return itr->snapshot_finish(itr);
     return 0;
 }
 
 int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
                    struct auxtrace_mmap *mm,
                    unsigned char *data, u64 *head, u64 *old)
 {
     if (itr && itr->find_snapshot)
         return itr->find_snapshot(itr, idx, mm, data, head, old);
     return 0;
 }
 
 int auxtrace_record__options(struct auxtrace_record *itr,
                  struct evlist *evlist,
                  struct record_opts *opts)
 {
     if (itr) {
         itr->evlist = evlist;
         return itr->recording_options(itr, evlist, opts);
     }
     return 0;
 }
 
 u64 auxtrace_record__reference(struct auxtrace_record *itr)
 {
     if (itr)
         return itr->reference(itr);
     return 0;
 }
 
 int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
                     struct record_opts *opts, const char *str)
 {
     if (!str)
         return 0;
 
     /* PMU-agnostic options */
     switch (*str) {
     case 'e':
         opts->auxtrace_snapshot_on_exit = true;
         str++;
         break;
     default:
         break;
     }
 
     if (itr && itr->parse_snapshot_options)
         return itr->parse_snapshot_options(itr, opts, str);
 
     pr_err("No AUX area tracing to snapshot\n");
     return -EINVAL;
 }
 
 static int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel, int idx)
 {
     bool per_cpu_mmaps = !perf_cpu_map__empty(evlist->core.user_requested_cpus);
 
     if (per_cpu_mmaps) {
         struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
         int cpu_map_idx = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
 
         if (cpu_map_idx == -1)
             return -EINVAL;
         return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
     }
 
     return perf_evsel__enable_thread(&evsel->core, idx);
 }
 
 int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
 {
     struct evsel *evsel;
 
     if (!itr->evlist || !itr->pmu)
         return -EINVAL;
 
     evlist__for_each_entry(itr->evlist, evsel) {
         if (evsel->core.attr.type == itr->pmu->type) {
             if (evsel->disabled)
                 return 0;
             return evlist__enable_event_idx(itr->evlist, evsel, idx);
         }
     }
     return -EINVAL;
 }
 
 /*
  * Event record size is 16-bit which results in a maximum size of about 64KiB.
  * Allow about 4KiB for the rest of the sample record, to give a maximum
  * AUX area sample size of 60KiB.
  */
 #define MAX_AUX_SAMPLE_SIZE (60 * 1024)
 
 /* Arbitrary default size if no other default provided */
 #define DEFAULT_AUX_SAMPLE_SIZE (4 * 1024)
 
 static int auxtrace_validate_aux_sample_size(struct evlist *evlist,
                          struct record_opts *opts)
 {
     struct evsel *evsel;
     bool has_aux_leader = false;
     u32 sz;
 
     evlist__for_each_entry(evlist, evsel) {
         sz = evsel->core.attr.aux_sample_size;
         if (evsel__is_group_leader(evsel)) {
             has_aux_leader = evsel__is_aux_event(evsel);
             if (sz) {
                 if (has_aux_leader)
                     pr_err("Cannot add AUX area sampling to an AUX area event\n");
                 else
                     pr_err("Cannot add AUX area sampling to a group leader\n");
                 return -EINVAL;
             }
         }
         if (sz > MAX_AUX_SAMPLE_SIZE) {
             pr_err("AUX area sample size %u too big, max. %d\n",
                    sz, MAX_AUX_SAMPLE_SIZE);
             return -EINVAL;
         }
         if (sz) {
             if (!has_aux_leader) {
                 pr_err("Cannot add AUX area sampling because group leader is not an AUX area event\n");
                 return -EINVAL;
             }
             evsel__set_sample_bit(evsel, AUX);
             opts->auxtrace_sample_mode = true;
         } else {
             evsel__reset_sample_bit(evsel, AUX);
         }
     }
 
     if (!opts->auxtrace_sample_mode) {
         pr_err("AUX area sampling requires an AUX area event group leader plus other events to which to add samples\n");
         return -EINVAL;
     }
 
     if (!perf_can_aux_sample()) {
         pr_err("AUX area sampling is not supported by kernel\n");
         return -EINVAL;
     }
 
     return 0;
 }
 
 int auxtrace_parse_sample_options(struct auxtrace_record *itr,
                   struct evlist *evlist,
                   struct record_opts *opts, const char *str)
 {
     struct evsel_config_term *term;
     struct evsel *aux_evsel;
     bool has_aux_sample_size = false;
     bool has_aux_leader = false;
     struct evsel *evsel;
     char *endptr;
     unsigned long sz;
 
     if (!str)
         goto no_opt;
 
     if (!itr) {
         pr_err("No AUX area event to sample\n");
         return -EINVAL;
     }
 
     sz = strtoul(str, &endptr, 0);
     if (*endptr || sz > UINT_MAX) {
         pr_err("Bad AUX area sampling option: '%s'\n", str);
         return -EINVAL;
     }
 
     if (!sz)
         sz = itr->default_aux_sample_size;
 
     if (!sz)
         sz = DEFAULT_AUX_SAMPLE_SIZE;
 
     /* Set aux_sample_size based on --aux-sample option */
     evlist__for_each_entry(evlist, evsel) {
         if (evsel__is_group_leader(evsel)) {
             has_aux_leader = evsel__is_aux_event(evsel);
         } else if (has_aux_leader) {
             evsel->core.attr.aux_sample_size = sz;
         }
     }
 no_opt:
     aux_evsel = NULL;
     /* Override with aux_sample_size from config term */
     evlist__for_each_entry(evlist, evsel) {
         if (evsel__is_aux_event(evsel))
             aux_evsel = evsel;
         term = evsel__get_config_term(evsel, AUX_SAMPLE_SIZE);
         if (term) {
             has_aux_sample_size = true;
             evsel->core.attr.aux_sample_size = term->val.aux_sample_size;
             /* If possible, group with the AUX event */
             if (aux_evsel && evsel->core.attr.aux_sample_size)
                 evlist__regroup(evlist, aux_evsel, evsel);
         }
     }
 
     if (!str && !has_aux_sample_size)
         return 0;
 
     if (!itr) {
         pr_err("No AUX area event to sample\n");
         return -EINVAL;
     }
 
     return auxtrace_validate_aux_sample_size(evlist, opts);
 }
 
 void auxtrace_regroup_aux_output(struct evlist *evlist)
 {
     struct evsel *evsel, *aux_evsel = NULL;
     struct evsel_config_term *term;
 
     evlist__for_each_entry(evlist, evsel) {
         if (evsel__is_aux_event(evsel))
             aux_evsel = evsel;
         term = evsel__get_config_term(evsel, AUX_OUTPUT);
         /* If possible, group with the AUX event */
         if (term && aux_evsel)
             evlist__regroup(evlist, aux_evsel, evsel);
     }
 }
 
 struct auxtrace_record *__weak
 auxtrace_record__init(struct evlist *evlist __maybe_unused, int *err)
 {
     *err = 0;
     return NULL;
 }
 
 static int auxtrace_index__alloc(struct list_head *head)
 {
     struct auxtrace_index *auxtrace_index;
 
     auxtrace_index = malloc(sizeof(struct auxtrace_index));
     if (!auxtrace_index)
         return -ENOMEM;
 
     auxtrace_index->nr = 0;
     INIT_LIST_HEAD(&auxtrace_index->list);
 
     list_add_tail(&auxtrace_index->list, head);
 
     return 0;
 }
 
 void auxtrace_index__free(struct list_head *head)
 {
     struct auxtrace_index *auxtrace_index, *n;
 
     list_for_each_entry_safe(auxtrace_index, n, head, list) {
         list_del_init(&auxtrace_index->list);
         free(auxtrace_index);
     }
 }
 
 static struct auxtrace_index *auxtrace_index__last(struct list_head *head)
 {
     struct auxtrace_index *auxtrace_index;
     int err;
 
     if (list_empty(head)) {
         err = auxtrace_index__alloc(head);
         if (err)
             return NULL;
     }
 
     auxtrace_index = list_entry(head->prev, struct auxtrace_index, list);
 
     if (auxtrace_index->nr >= PERF_AUXTRACE_INDEX_ENTRY_COUNT) {
         err = auxtrace_index__alloc(head);
         if (err)
             return NULL;
         auxtrace_index = list_entry(head->prev, struct auxtrace_index,
                         list);
     }
 
     return auxtrace_index;
 }
 
 int auxtrace_index__auxtrace_event(struct list_head *head,
                    union perf_event *event, off_t file_offset)
 {
     struct auxtrace_index *auxtrace_index;
     size_t nr;
 
     auxtrace_index = auxtrace_index__last(head);
     if (!auxtrace_index)
         return -ENOMEM;
 
     nr = auxtrace_index->nr;
     auxtrace_index->entries[nr].file_offset = file_offset;
     auxtrace_index->entries[nr].sz = event->header.size;
     auxtrace_index->nr += 1;
 
     return 0;
 }
 
 static int auxtrace_index__do_write(int fd,
                     struct auxtrace_index *auxtrace_index)
 {
     struct auxtrace_index_entry ent;
     size_t i;
 
     for (i = 0; i < auxtrace_index->nr; i++) {
         ent.file_offset = auxtrace_index->entries[i].file_offset;
         ent.sz = auxtrace_index->entries[i].sz;
         if (writen(fd, &ent, sizeof(ent)) != sizeof(ent))
             return -errno;
     }
     return 0;
 }
 
 int auxtrace_index__write(int fd, struct list_head *head)
 {
     struct auxtrace_index *auxtrace_index;
     u64 total = 0;
     int err;
 
     list_for_each_entry(auxtrace_index, head, list)
         total += auxtrace_index->nr;
 
     if (writen(fd, &total, sizeof(total)) != sizeof(total))
         return -errno;
 
     list_for_each_entry(auxtrace_index, head, list) {
         err = auxtrace_index__do_write(fd, auxtrace_index);
         if (err)
             return err;
     }
 
     return 0;
 }
 
 static int auxtrace_index__process_entry(int fd, struct list_head *head,
                      bool needs_swap)
 {
     struct auxtrace_index *auxtrace_index;
     struct auxtrace_index_entry ent;
     size_t nr;
 
     if (readn(fd, &ent, sizeof(ent)) != sizeof(ent))
         return -1;
 
     auxtrace_index = auxtrace_index__last(head);
     if (!auxtrace_index)
         return -1;
 
     nr = auxtrace_index->nr;
     if (needs_swap) {
         auxtrace_index->entries[nr].file_offset =
                         bswap_64(ent.file_offset);
         auxtrace_index->entries[nr].sz = bswap_64(ent.sz);
     } else {
         auxtrace_index->entries[nr].file_offset = ent.file_offset;
         auxtrace_index->entries[nr].sz = ent.sz;
     }
 
     auxtrace_index->nr = nr + 1;
 
     return 0;
 }
 
 int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
                 bool needs_swap)
 {
     struct list_head *head = &session->auxtrace_index;
     u64 nr;
 
     if (readn(fd, &nr, sizeof(u64)) != sizeof(u64))
         return -1;
 
     if (needs_swap)
         nr = bswap_64(nr);
 
     if (sizeof(u64) + nr * sizeof(struct auxtrace_index_entry) > size)
         return -1;
 
     while (nr--) {
         int err;
 
         err = auxtrace_index__process_entry(fd, head, needs_swap);
         if (err)
             return -1;
     }
 
     return 0;
 }
 
 static int auxtrace_queues__process_index_entry(struct auxtrace_queues *queues,
                         struct perf_session *session,
                         struct auxtrace_index_entry *ent)
 {
     return auxtrace_queues__add_indexed_event(queues, session,
                           ent->file_offset, ent->sz);
 }
 
 int auxtrace_queues__process_index(struct auxtrace_queues *queues,
                    struct perf_session *session)
 {
     struct auxtrace_index *auxtrace_index;
     struct auxtrace_index_entry *ent;
     size_t i;
     int err;
 
     if (auxtrace__dont_decode(session))
         return 0;
 
     list_for_each_entry(auxtrace_index, &session->auxtrace_index, list) {
         for (i = 0; i < auxtrace_index->nr; i++) {
             ent = &auxtrace_index->entries[i];
             err = auxtrace_queues__process_index_entry(queues,
                                    session,
                                    ent);
             if (err)
                 return err;
         }
     }
     return 0;
 }
 
 struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
                           struct auxtrace_buffer *buffer)
 {
     if (buffer) {
         if (list_is_last(&buffer->list, &queue->head))
             return NULL;
         return list_entry(buffer->list.next, struct auxtrace_buffer,
                   list);
     } else {
         if (list_empty(&queue->head))
             return NULL;
         return list_entry(queue->head.next, struct auxtrace_buffer,
                   list);
     }
 }
 
 struct auxtrace_queue *auxtrace_queues__sample_queue(struct auxtrace_queues *queues,
                              struct perf_sample *sample,
                              struct perf_session *session)
 {
     struct perf_sample_id *sid;
     unsigned int idx;
     u64 id;
 
     id = sample->id;
     if (!id)
         return NULL;
 
     sid = evlist__id2sid(session->evlist, id);
     if (!sid)
         return NULL;
 
     idx = sid->idx;
 
     if (idx >= queues->nr_queues)
         return NULL;
 
     return &queues->queue_array[idx];
 }
 
 int auxtrace_queues__add_sample(struct auxtrace_queues *queues,
                 struct perf_session *session,
                 struct perf_sample *sample, u64 data_offset,
                 u64 reference)
 {
     struct auxtrace_buffer buffer = {
         .pid = -1,
         .data_offset = data_offset,
         .reference = reference,
         .size = sample->aux_sample.size,
     };
     struct perf_sample_id *sid;
     u64 id = sample->id;
     unsigned int idx;
 
     if (!id)
         return -EINVAL;
 
     sid = evlist__id2sid(session->evlist, id);
     if (!sid)
         return -ENOENT;
 
     idx = sid->idx;
     buffer.tid = sid->tid;
     buffer.cpu = sid->cpu;
 
     return auxtrace_queues__add_buffer(queues, session, idx, &buffer, NULL);
 }
 
 struct queue_data {
     bool samples;
     bool events;
 };
 
 static int auxtrace_queue_data_cb(struct perf_session *session,
                   union perf_event *event, u64 offset,
                   void *data)
 {
     struct queue_data *qd = data;
     struct perf_sample sample;
     int err;
 
     if (qd->events && event->header.type == PERF_RECORD_AUXTRACE) {
         if (event->header.size < sizeof(struct perf_record_auxtrace))
             return -EINVAL;
         offset += event->header.size;
         return session->auxtrace->queue_data(session, NULL, event,
                              offset);
     }
 
     if (!qd->samples || event->header.type != PERF_RECORD_SAMPLE)
         return 0;
 
     err = evlist__parse_sample(session->evlist, event, &sample);
     if (err)
         return err;
 
     if (!sample.aux_sample.size)
         return 0;
 
     offset += sample.aux_sample.data - (void *)event;
 
     return session->auxtrace->queue_data(session, &sample, NULL, offset);
 }
 
 int auxtrace_queue_data(struct perf_session *session, bool samples, bool events)
 {
     struct queue_data qd = {
         .samples = samples,
         .events = events,
     };
 
     if (auxtrace__dont_decode(session))
         return 0;
 
     if (!session->auxtrace || !session->auxtrace->queue_data)
         return -EINVAL;
 
     return perf_session__peek_events(session, session->header.data_offset,
                      session->header.data_size,
                      auxtrace_queue_data_cb, &qd);
 }
 
 void *auxtrace_buffer__get_data_rw(struct auxtrace_buffer *buffer, int fd, bool rw)
 {
     int prot = rw ? PROT_READ | PROT_WRITE : PROT_READ;
     size_t adj = buffer->data_offset & (page_size - 1);
     size_t size = buffer->size + adj;
     off_t file_offset = buffer->data_offset - adj;
     void *addr;
 
     if (buffer->data)
         return buffer->data;
 
     addr = mmap(NULL, size, prot, MAP_SHARED, fd, file_offset);
     if (addr == MAP_FAILED)
         return NULL;
 
     buffer->mmap_addr = addr;
     buffer->mmap_size = size;
 
     buffer->data = addr + adj;
 
     return buffer->data;
 }
 
 void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer)
 {
     if (!buffer->data || !buffer->mmap_addr)
         return;
     munmap(buffer->mmap_addr, buffer->mmap_size);
     buffer->mmap_addr = NULL;
     buffer->mmap_size = 0;
     buffer->data = NULL;
     buffer->use_data = NULL;
 }
 
 void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer)
 {
     auxtrace_buffer__put_data(buffer);
     if (buffer->data_needs_freeing) {
         buffer->data_needs_freeing = false;
         zfree(&buffer->data);
         buffer->use_data = NULL;
         buffer->size = 0;
     }
 }
 
 void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
 {
     auxtrace_buffer__drop_data(buffer);
     free(buffer);
 }
 
 void auxtrace_synth_guest_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
                 int code, int cpu, pid_t pid, pid_t tid, u64 ip,
                 const char *msg, u64 timestamp,
                 pid_t machine_pid, int vcpu)
 {
     size_t size;
 
     memset(auxtrace_error, 0, sizeof(struct perf_record_auxtrace_error));
 
     auxtrace_error->header.type = PERF_RECORD_AUXTRACE_ERROR;
     auxtrace_error->type = type;
     auxtrace_error->code = code;
     auxtrace_error->cpu = cpu;
     auxtrace_error->pid = pid;
     auxtrace_error->tid = tid;
     auxtrace_error->fmt = 1;
     auxtrace_error->ip = ip;
     auxtrace_error->time = timestamp;
     strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
     if (machine_pid) {
         auxtrace_error->fmt = 2;
         auxtrace_error->machine_pid = machine_pid;
         auxtrace_error->vcpu = vcpu;
         size = sizeof(*auxtrace_error);
     } else {
         size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
                strlen(auxtrace_error->msg) + 1;
     }
     auxtrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
 }
 
 void auxtrace_synth_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
               int code, int cpu, pid_t pid, pid_t tid, u64 ip,
               const char *msg, u64 timestamp)
 {
     auxtrace_synth_guest_error(auxtrace_error, type, code, cpu, pid, tid,
                    ip, msg, timestamp, 0, -1);
 }
 
 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
                      struct perf_tool *tool,
                      struct perf_session *session,
                      perf_event__handler_t process)
 {
     union perf_event *ev;
     size_t priv_size;
     int err;
 
     pr_debug2("Synthesizing auxtrace information\n");
     priv_size = auxtrace_record__info_priv_size(itr, session->evlist);
     ev = zalloc(sizeof(struct perf_record_auxtrace_info) + priv_size);
     if (!ev)
         return -ENOMEM;
 
     ev->auxtrace_info.header.type = PERF_RECORD_AUXTRACE_INFO;
     ev->auxtrace_info.header.size = sizeof(struct perf_record_auxtrace_info) +
                     priv_size;
     err = auxtrace_record__info_fill(itr, session, &ev->auxtrace_info,
                      priv_size);
     if (err)
         goto out_free;
 
     err = process(tool, ev, NULL, NULL);
 out_free:
     free(ev);
     return err;
 }
 
 static void unleader_evsel(struct evlist *evlist, struct evsel *leader)
 {
     struct evsel *new_leader = NULL;
     struct evsel *evsel;
 
     /* Find new leader for the group */
     evlist__for_each_entry(evlist, evsel) {
         if (!evsel__has_leader(evsel, leader) || evsel == leader)
             continue;
         if (!new_leader)
             new_leader = evsel;
         evsel__set_leader(evsel, new_leader);
     }
 
     /* Update group information */
     if (new_leader) {
         zfree(&new_leader->group_name);
         new_leader->group_name = leader->group_name;
         leader->group_name = NULL;
 
         new_leader->core.nr_members = leader->core.nr_members - 1;
         leader->core.nr_members = 1;
     }
 }
 
 static void unleader_auxtrace(struct perf_session *session)
 {
     struct evsel *evsel;
 
     evlist__for_each_entry(session->evlist, evsel) {
         if (auxtrace__evsel_is_auxtrace(session, evsel) &&
             evsel__is_group_leader(evsel)) {
             unleader_evsel(session->evlist, evsel);
         }
     }
 }
 
 int perf_event__process_auxtrace_info(struct perf_session *session,
                       union perf_event *event)
 {
     enum auxtrace_type type = event->auxtrace_info.type;
     int err;
 
     if (dump_trace)
         fprintf(stdout, " type: %u\n", type);
 
     switch (type) {
     case PERF_AUXTRACE_INTEL_PT:
         err = intel_pt_process_auxtrace_info(event, session);
         break;
     case PERF_AUXTRACE_INTEL_BTS:
         err = intel_bts_process_auxtrace_info(event, session);
         break;
     case PERF_AUXTRACE_ARM_SPE:
         err = arm_spe_process_auxtrace_info(event, session);
         break;
     case PERF_AUXTRACE_CS_ETM:
         err = cs_etm__process_auxtrace_info(event, session);
         break;
     case PERF_AUXTRACE_S390_CPUMSF:
         err = s390_cpumsf_process_auxtrace_info(event, session);
         break;
     case PERF_AUXTRACE_UNKNOWN:
     default:
         return -EINVAL;
     }
 
     if (err)
         return err;
 
     unleader_auxtrace(session);
 
     return 0;
 }
 
 s64 perf_event__process_auxtrace(struct perf_session *session,
                  union perf_event *event)
 {
     s64 err;
 
     if (dump_trace)
         fprintf(stdout, " size: %#"PRI_lx64"  offset: %#"PRI_lx64"  ref: %#"PRI_lx64"  idx: %u  tid: %d  cpu: %d\n",
             event->auxtrace.size, event->auxtrace.offset,
             event->auxtrace.reference, event->auxtrace.idx,
             event->auxtrace.tid, event->auxtrace.cpu);
 
     if (auxtrace__dont_decode(session))
         return event->auxtrace.size;
 
     if (!session->auxtrace || event->header.type != PERF_RECORD_AUXTRACE)
         return -EINVAL;
 
     err = session->auxtrace->process_auxtrace_event(session, event, session->tool);
     if (err < 0)
         return err;
 
     return event->auxtrace.size;
 }
 
 #define PERF_ITRACE_DEFAULT_PERIOD_TYPE     PERF_ITRACE_PERIOD_NANOSECS
 #define PERF_ITRACE_DEFAULT_PERIOD      100000
 #define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ    16
 #define PERF_ITRACE_MAX_CALLCHAIN_SZ        1024
 #define PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ  64
 #define PERF_ITRACE_MAX_LAST_BRANCH_SZ      1024
 
 void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
                     bool no_sample)
 {
     synth_opts->branches = true;
     synth_opts->transactions = true;
     synth_opts->ptwrites = true;
     synth_opts->pwr_events = true;
     synth_opts->other_events = true;
     synth_opts->intr_events = true;
     synth_opts->errors = true;
     synth_opts->flc = true;
     synth_opts->llc = true;
     synth_opts->tlb = true;
     synth_opts->mem = true;
     synth_opts->remote_access = true;
 
     if (no_sample) {
         synth_opts->period_type = PERF_ITRACE_PERIOD_INSTRUCTIONS;
         synth_opts->period = 1;
         synth_opts->calls = true;
     } else {
         synth_opts->instructions = true;
         synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
         synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
     }
     synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
     synth_opts->last_branch_sz = PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
     synth_opts->initial_skip = 0;
 }
 
 static int get_flag(const char **ptr, unsigned int *flags)
 {
     while (1) {
         char c = **ptr;
 
         if (c >= 'a' && c <= 'z') {
             *flags |= 1 << (c - 'a');
             ++*ptr;
             return 0;
         } else if (c == ' ') {
             ++*ptr;
             continue;
         } else {
             return -1;
         }
     }
 }
 
 static int get_flags(const char **ptr, unsigned int *plus_flags, unsigned int *minus_flags)
 {
     while (1) {
         switch (**ptr) {
         case '+':
             ++*ptr;
             if (get_flag(ptr, plus_flags))
                 return -1;
             break;
         case '-':
             ++*ptr;
             if (get_flag(ptr, minus_flags))
                 return -1;
             break;
         case ' ':
             ++*ptr;
             break;
         default:
             return 0;
         }
     }
 }
 
 /*
  * Please check tools/perf/Documentation/perf-script.txt for information
  * about the options parsed here, which is introduced after this cset,
  * when support in 'perf script' for these options is introduced.
  */
 int itrace_do_parse_synth_opts(struct itrace_synth_opts *synth_opts,
                    const char *str, int unset)
 {
     const char *p;
     char *endptr;
     bool period_type_set = false;
     bool period_set = false;
 
     synth_opts->set = true;
 
     if (unset) {
         synth_opts->dont_decode = true;
         return 0;
     }
 
     if (!str) {
         itrace_synth_opts__set_default(synth_opts,
                            synth_opts->default_no_sample);
         return 0;
     }
 
     for (p = str; *p;) {
         switch (*p++) {
         case 'i':
             synth_opts->instructions = true;
             while (*p == ' ' || *p == ',')
                 p += 1;
             if (isdigit(*p)) {
                 synth_opts->period = strtoull(p, &endptr, 10);
                 period_set = true;
                 p = endptr;
                 while (*p == ' ' || *p == ',')
                     p += 1;
                 switch (*p++) {
                 case 'i':
                     synth_opts->period_type =
                         PERF_ITRACE_PERIOD_INSTRUCTIONS;
                     period_type_set = true;
                     break;
                 case 't':
                     synth_opts->period_type =
                         PERF_ITRACE_PERIOD_TICKS;
                     period_type_set = true;
                     break;
                 case 'm':
                     synth_opts->period *= 1000;
                     /* Fall through */
                 case 'u':
                     synth_opts->period *= 1000;
                     /* Fall through */
                 case 'n':
                     if (*p++ != 's')
                         goto out_err;
                     synth_opts->period_type =
                         PERF_ITRACE_PERIOD_NANOSECS;
                     period_type_set = true;
                     break;
                 case '\0':
                     goto out;
                 default:
                     goto out_err;
                 }
             }
             break;
         case 'b':
             synth_opts->branches = true;
             break;
         case 'x':
             synth_opts->transactions = true;
             break;
         case 'w':
             synth_opts->ptwrites = true;
             break;
         case 'p':
             synth_opts->pwr_events = true;
             break;
         case 'o':
             synth_opts->other_events = true;
             break;
         case 'I':
             synth_opts->intr_events = true;
             break;
         case 'e':
             synth_opts->errors = true;
             if (get_flags(&p, &synth_opts->error_plus_flags,
                       &synth_opts->error_minus_flags))
                 goto out_err;
             break;
         case 'd':
             synth_opts->log = true;
             if (get_flags(&p, &synth_opts->log_plus_flags,
                       &synth_opts->log_minus_flags))
                 goto out_err;
             break;
         case 'c':
             synth_opts->branches = true;
             synth_opts->calls = true;
             break;
         case 'r':
             synth_opts->branches = true;
             synth_opts->returns = true;
             break;
         case 'G':
         case 'g':
             if (p[-1] == 'G')
                 synth_opts->add_callchain = true;
             else
                 synth_opts->callchain = true;
             synth_opts->callchain_sz =
                     PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
             while (*p == ' ' || *p == ',')
                 p += 1;
             if (isdigit(*p)) {
                 unsigned int val;
 
                 val = strtoul(p, &endptr, 10);
                 p = endptr;
                 if (!val || val > PERF_ITRACE_MAX_CALLCHAIN_SZ)
                     goto out_err;
                 synth_opts->callchain_sz = val;
             }
             break;
         case 'L':
         case 'l':
             if (p[-1] == 'L')
                 synth_opts->add_last_branch = true;
             else
                 synth_opts->last_branch = true;
             synth_opts->last_branch_sz =
                     PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
             while (*p == ' ' || *p == ',')
                 p += 1;
             if (isdigit(*p)) {
                 unsigned int val;
 
                 val = strtoul(p, &endptr, 10);
                 p = endptr;
                 if (!val ||
                     val > PERF_ITRACE_MAX_LAST_BRANCH_SZ)
                     goto out_err;
                 synth_opts->last_branch_sz = val;
             }
             break;
         case 's':
             synth_opts->initial_skip = strtoul(p, &endptr, 10);
             if (p == endptr)
                 goto out_err;
             p = endptr;
             break;
         case 'f':
             synth_opts->flc = true;
             break;
         case 'm':
             synth_opts->llc = true;
             break;
         case 't':
             synth_opts->tlb = true;
             break;
         case 'a':
             synth_opts->remote_access = true;
             break;
         case 'M':
             synth_opts->mem = true;
             break;
         case 'q':
             synth_opts->quick += 1;
             break;
         case 'A':
             synth_opts->approx_ipc = true;
             break;
         case 'Z':
             synth_opts->timeless_decoding = true;
             break;
         case ' ':
         case ',':
             break;
         default:
             goto out_err;
         }
     }
 out:
     if (synth_opts->instructions) {
         if (!period_type_set)
             synth_opts->period_type =
                     PERF_ITRACE_DEFAULT_PERIOD_TYPE;
         if (!period_set)
             synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
     }
 
     return 0;
 
 out_err:
     pr_err("Bad Instruction Tracing options '%s'\n", str);
     return -EINVAL;
 }
 
 int itrace_parse_synth_opts(const struct option *opt, const char *str, int unset)
 {
     return itrace_do_parse_synth_opts(opt->value, str, unset);
 }
 
 static const char * const auxtrace_error_type_name[] = {
     [PERF_AUXTRACE_ERROR_ITRACE] = "instruction trace",
 };
 
 static const char *auxtrace_error_name(int type)
 {
     const char *error_type_name = NULL;
 
     if (type < PERF_AUXTRACE_ERROR_MAX)
         error_type_name = auxtrace_error_type_name[type];
     if (!error_type_name)
         error_type_name = "unknown AUX";
     return error_type_name;
 }
 
 size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
 {
     struct perf_record_auxtrace_error *e = &event->auxtrace_error;
     unsigned long long nsecs = e->time;
     const char *msg = e->msg;
     int ret;
 
     ret = fprintf(fp, " %s error type %u",
               auxtrace_error_name(e->type), e->type);
 
     if (e->fmt && nsecs) {
         unsigned long secs = nsecs / NSEC_PER_SEC;
 
         nsecs -= secs * NSEC_PER_SEC;
         ret += fprintf(fp, " time %lu.%09llu", secs, nsecs);
     } else {
         ret += fprintf(fp, " time 0");
     }
 
     if (!e->fmt)
         msg = (const char *)&e->time;
 
     if (e->fmt >= 2 && e->machine_pid)
         ret += fprintf(fp, " machine_pid %d vcpu %d", e->machine_pid, e->vcpu);
 
     ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRI_lx64" code %u: %s\n",
                e->cpu, e->pid, e->tid, e->ip, e->code, msg);
     return ret;
 }
 
 void perf_session__auxtrace_error_inc(struct perf_session *session,
                       union perf_event *event)
 {
     struct perf_record_auxtrace_error *e = &event->auxtrace_error;
 
     if (e->type < PERF_AUXTRACE_ERROR_MAX)
         session->evlist->stats.nr_auxtrace_errors[e->type] += 1;
 }
 
 void events_stats__auxtrace_error_warn(const struct events_stats *stats)
 {
     int i;
 
     for (i = 0; i < PERF_AUXTRACE_ERROR_MAX; i++) {
         if (!stats->nr_auxtrace_errors[i])
             continue;
         ui__warning("%u %s errors\n",
                 stats->nr_auxtrace_errors[i],
                 auxtrace_error_name(i));
     }
 }
 
 int perf_event__process_auxtrace_error(struct perf_session *session,
                        union perf_event *event)
 {
     if (auxtrace__dont_decode(session))
         return 0;
 
     perf_event__fprintf_auxtrace_error(event, stdout);
     return 0;
 }
 
 /*
  * In the compat mode kernel runs in 64-bit and perf tool runs in 32-bit mode,
  * 32-bit perf tool cannot access 64-bit value atomically, which might lead to
  * the issues caused by the below sequence on multiple CPUs: when perf tool
  * accesses either the load operation or the store operation for 64-bit value,
  * on some architectures the operation is divided into two instructions, one
  * is for accessing the low 32-bit value and another is for the high 32-bit;
  * thus these two user operations can give the kernel chances to access the
  * 64-bit value, and thus leads to the unexpected load values.
  *
  *   kernel (64-bit)                        user (32-bit)
  *
  *   if (LOAD ->aux_tail) { --,             LOAD ->aux_head_lo
  *       STORE $aux_data      |       ,--->
  *       FLUSH $aux_data      |       |     LOAD ->aux_head_hi
  *       STORE ->aux_head   --|-------`     smp_rmb()
  *   }                        |             LOAD $data
  *                            |             smp_mb()
  *                            |             STORE ->aux_tail_lo
  *                            `----------->
  *                                          STORE ->aux_tail_hi
  *
  * For this reason, it's impossible for the perf tool to work correctly when
  * the AUX head or tail is bigger than 4GB (more than 32 bits length); and we
  * can not simply limit the AUX ring buffer to less than 4GB, the reason is
  * the pointers can be increased monotonically, whatever the buffer size it is,
  * at the end the head and tail can be bigger than 4GB and carry out to the
  * high 32-bit.
  *
  * To mitigate the issues and improve the user experience, we can allow the
  * perf tool working in certain conditions and bail out with error if detect
  * any overflow cannot be handled.
  *
  * For reading the AUX head, it reads out the values for three times, and
  * compares the high 4 bytes of the values between the first time and the last
  * time, if there has no change for high 4 bytes injected by the kernel during
  * the user reading sequence, it's safe for use the second value.
  *
  * When compat_auxtrace_mmap__write_tail() detects any carrying in the high
  * 32 bits, it means there have two store operations in user space and it cannot
  * promise the atomicity for 64-bit write, so return '-1' in this case to tell
  * the caller an overflow error has happened.
  */
 u64 __weak compat_auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
 {
     struct perf_event_mmap_page *pc = mm->userpg;
     u64 first, second, last;
     u64 mask = (u64)(UINT32_MAX) << 32;
 
     do {
         first = READ_ONCE(pc->aux_head);
         /* Ensure all reads are done after we read the head */
         smp_rmb();
         second = READ_ONCE(pc->aux_head);
         /* Ensure all reads are done after we read the head */
         smp_rmb();
         last = READ_ONCE(pc->aux_head);
     } while ((first & mask) != (last & mask));
 
     return second;
 }
 
 int __weak compat_auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
 {
     struct perf_event_mmap_page *pc = mm->userpg;
     u64 mask = (u64)(UINT32_MAX) << 32;
 
     if (tail & mask)
         return -1;
 
     /* Ensure all reads are done before we write the tail out */
     smp_mb();
     WRITE_ONCE(pc->aux_tail, tail);
     return 0;
 }
 
 static int __auxtrace_mmap__read(struct mmap *map,
                  struct auxtrace_record *itr,
                  struct perf_tool *tool, process_auxtrace_t fn,
                  bool snapshot, size_t snapshot_size)
 {
     struct auxtrace_mmap *mm = &map->auxtrace_mmap;
     u64 head, old = mm->prev, offset, ref;
     unsigned char *data = mm->base;
     size_t size, head_off, old_off, len1, len2, padding;
     union perf_event ev;
     void *data1, *data2;
     int kernel_is_64_bit = perf_env__kernel_is_64_bit(evsel__env(NULL));
 
     head = auxtrace_mmap__read_head(mm, kernel_is_64_bit);
 
     if (snapshot &&
         auxtrace_record__find_snapshot(itr, mm->idx, mm, data, &head, &old))
         return -1;
 
     if (old == head)
         return 0;
 
     pr_debug3("auxtrace idx %d old %#"PRIx64" head %#"PRIx64" diff %#"PRIx64"\n",
           mm->idx, old, head, head - old);
 
     if (mm->mask) {
         head_off = head & mm->mask;
         old_off = old & mm->mask;
     } else {
         head_off = head % mm->len;
         old_off = old % mm->len;
     }
 
     if (head_off > old_off)
         size = head_off - old_off;
     else
         size = mm->len - (old_off - head_off);
 
     if (snapshot && size > snapshot_size)
         size = snapshot_size;
 
     ref = auxtrace_record__reference(itr);
 
     if (head > old || size <= head || mm->mask) {
         offset = head - size;
     } else {
         /*
          * When the buffer size is not a power of 2, 'head' wraps at the
          * highest multiple of the buffer size, so we have to subtract
          * the remainder here.
          */
         u64 rem = (0ULL - mm->len) % mm->len;
 
         offset = head - size - rem;
     }
 
     if (size > head_off) {
         len1 = size - head_off;
         data1 = &data[mm->len - len1];
         len2 = head_off;
         data2 = &data[0];
     } else {
         len1 = size;
         data1 = &data[head_off - len1];
         len2 = 0;
         data2 = NULL;
     }
 
     if (itr->alignment) {
         unsigned int unwanted = len1 % itr->alignment;
 
         len1 -= unwanted;
         size -= unwanted;
     }
 
     /* padding must be written by fn() e.g. record__process_auxtrace() */
     padding = size & (PERF_AUXTRACE_RECORD_ALIGNMENT - 1);
     if (padding)
         padding = PERF_AUXTRACE_RECORD_ALIGNMENT - padding;
 
     memset(&ev, 0, sizeof(ev));
     ev.auxtrace.header.type = PERF_RECORD_AUXTRACE;
     ev.auxtrace.header.size = sizeof(ev.auxtrace);
     ev.auxtrace.size = size + padding;
     ev.auxtrace.offset = offset;
     ev.auxtrace.reference = ref;
     ev.auxtrace.idx = mm->idx;
     ev.auxtrace.tid = mm->tid;
     ev.auxtrace.cpu = mm->cpu;
 
     if (fn(tool, map, &ev, data1, len1, data2, len2))
         return -1;
 
     mm->prev = head;
 
     if (!snapshot) {
         int err;
 
         err = auxtrace_mmap__write_tail(mm, head, kernel_is_64_bit);
         if (err < 0)
             return err;
 
         if (itr->read_finish) {
             err = itr->read_finish(itr, mm->idx);
             if (err < 0)
                 return err;
         }
     }
 
     return 1;
 }
 
 int auxtrace_mmap__read(struct mmap *map, struct auxtrace_record *itr,
             struct perf_tool *tool, process_auxtrace_t fn)
 {
     return __auxtrace_mmap__read(map, itr, tool, fn, false, 0);
 }
 
 int auxtrace_mmap__read_snapshot(struct mmap *map,
                  struct auxtrace_record *itr,
                  struct perf_tool *tool, process_auxtrace_t fn,
                  size_t snapshot_size)
 {
     return __auxtrace_mmap__read(map, itr, tool, fn, true, snapshot_size);
 }
 
 /**
  * struct auxtrace_cache - hash table to implement a cache
  * @hashtable: the hashtable
  * @sz: hashtable size (number of hlists)
  * @entry_size: size of an entry
  * @limit: limit the number of entries to this maximum, when reached the cache
  *         is dropped and caching begins again with an empty cache
  * @cnt: current number of entries
  * @bits: hashtable size (@sz = 2^@bits)
  */
 struct auxtrace_cache {
     struct hlist_head *hashtable;
     size_t sz;
     size_t entry_size;
     size_t limit;
     size_t cnt;
     unsigned int bits;
 };
 
 struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
                        unsigned int limit_percent)
 {
     struct auxtrace_cache *c;
     struct hlist_head *ht;
     size_t sz, i;
 
     c = zalloc(sizeof(struct auxtrace_cache));
     if (!c)
         return NULL;
 
     sz = 1UL << bits;
 
     ht = calloc(sz, sizeof(struct hlist_head));
     if (!ht)
         goto out_free;
 
     for (i = 0; i < sz; i++)
         INIT_HLIST_HEAD(&ht[i]);
 
     c->hashtable = ht;
     c->sz = sz;
     c->entry_size = entry_size;
     c->limit = (c->sz * limit_percent) / 100;
     c->bits = bits;
 
     return c;
 
 out_free:
     free(c);
     return NULL;
 }
 
 static void auxtrace_cache__drop(struct auxtrace_cache *c)
 {
     struct auxtrace_cache_entry *entry;
     struct hlist_node *tmp;
     size_t i;
 
     if (!c)
         return;
 
     for (i = 0; i < c->sz; i++) {
         hlist_for_each_entry_safe(entry, tmp, &c->hashtable[i], hash) {
             hlist_del(&entry->hash);
             auxtrace_cache__free_entry(c, entry);
         }
     }
 
     c->cnt = 0;
 }
 
 void auxtrace_cache__free(struct auxtrace_cache *c)
 {
     if (!c)
         return;
 
     auxtrace_cache__drop(c);
     zfree(&c->hashtable);
     free(c);
 }
 
 void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c)
 {
     return malloc(c->entry_size);
 }
 
 void auxtrace_cache__free_entry(struct auxtrace_cache *c __maybe_unused,
                 void *entry)
 {
     free(entry);
 }
 
 int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
             struct auxtrace_cache_entry *entry)
 {
     if (c->limit && ++c->cnt > c->limit)
         auxtrace_cache__drop(c);
 
     entry->key = key;
     hlist_add_head(&entry->hash, &c->hashtable[hash_32(key, c->bits)]);
 
     return 0;
 }
 
 static struct auxtrace_cache_entry *auxtrace_cache__rm(struct auxtrace_cache *c,
                                u32 key)
 {
     struct auxtrace_cache_entry *entry;
     struct hlist_head *hlist;
     struct hlist_node *n;
 
     if (!c)
         return NULL;
 
     hlist = &c->hashtable[hash_32(key, c->bits)];
     hlist_for_each_entry_safe(entry, n, hlist, hash) {
         if (entry->key == key) {
             hlist_del(&entry->hash);
             return entry;
         }
     }
 
     return NULL;
 }
 
 void auxtrace_cache__remove(struct auxtrace_cache *c, u32 key)
 {
     struct auxtrace_cache_entry *entry = auxtrace_cache__rm(c, key);
 
     auxtrace_cache__free_entry(c, entry);
 }
 
 void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key)
 {
     struct auxtrace_cache_entry *entry;
     struct hlist_head *hlist;
 
     if (!c)
         return NULL;
 
     hlist = &c->hashtable[hash_32(key, c->bits)];
     hlist_for_each_entry(entry, hlist, hash) {
         if (entry->key == key)
             return entry;
     }
 
     return NULL;
 }
 
 static void addr_filter__free_str(struct addr_filter *filt)
 {
     zfree(&filt->str);
     filt->action   = NULL;
     filt->sym_from = NULL;
     filt->sym_to   = NULL;
     filt->filename = NULL;
 }
 
 static struct addr_filter *addr_filter__new(void)
 {
     struct addr_filter *filt = zalloc(sizeof(*filt));
 
     if (filt)
         INIT_LIST_HEAD(&filt->list);
 
     return filt;
 }
 
 static void addr_filter__free(struct addr_filter *filt)
 {
     if (filt)
         addr_filter__free_str(filt);
     free(filt);
 }
 
 static void addr_filters__add(struct addr_filters *filts,
                   struct addr_filter *filt)
 {
     list_add_tail(&filt->list, &filts->head);
     filts->cnt += 1;
 }
 
 static void addr_filters__del(struct addr_filters *filts,
                   struct addr_filter *filt)
 {
     list_del_init(&filt->list);
     filts->cnt -= 1;
 }
 
 void addr_filters__init(struct addr_filters *filts)
 {
     INIT_LIST_HEAD(&filts->head);
     filts->cnt = 0;
 }
 
 void addr_filters__exit(struct addr_filters *filts)
 {
     struct addr_filter *filt, *n;
 
     list_for_each_entry_safe(filt, n, &filts->head, list) {
         addr_filters__del(filts, filt);
         addr_filter__free(filt);
     }
 }
 
 static int parse_num_or_str(char **inp, u64 *num, const char **str,
                 const char *str_delim)
 {
     *inp += strspn(*inp, " ");
 
     if (isdigit(**inp)) {
         char *endptr;
 
         if (!num)
             return -EINVAL;
         errno = 0;
         *num = strtoull(*inp, &endptr, 0);
         if (errno)
             return -errno;
         if (endptr == *inp)
             return -EINVAL;
         *inp = endptr;
     } else {
         size_t n;
 
         if (!str)
             return -EINVAL;
         *inp += strspn(*inp, " ");
         *str = *inp;
         n = strcspn(*inp, str_delim);
         if (!n)
             return -EINVAL;
         *inp += n;
         if (**inp) {
             **inp = '\0';
             *inp += 1;
         }
     }
     return 0;
 }
 
 static int parse_action(struct addr_filter *filt)
 {
     if (!strcmp(filt->action, "filter")) {
         filt->start = true;
         filt->range = true;
     } else if (!strcmp(filt->action, "start")) {
         filt->start = true;
     } else if (!strcmp(filt->action, "stop")) {
         filt->start = false;
     } else if (!strcmp(filt->action, "tracestop")) {
         filt->start = false;
         filt->range = true;
         filt->action += 5; /* Change 'tracestop' to 'stop' */
     } else {
         return -EINVAL;
     }
     return 0;
 }
 
 static int parse_sym_idx(char **inp, int *idx)
 {
     *idx = -1;
 
     *inp += strspn(*inp, " ");
 
     if (**inp != '#')
         return 0;
 
     *inp += 1;
 
     if (**inp == 'g' || **inp == 'G') {
         *inp += 1;
         *idx = 0;
     } else {
         unsigned long num;
         char *endptr;
 
         errno = 0;
         num = strtoul(*inp, &endptr, 0);
         if (errno)
             return -errno;
         if (endptr == *inp || num > INT_MAX)
             return -EINVAL;
         *inp = endptr;
         *idx = num;
     }
 
     return 0;
 }
 
 static int parse_addr_size(char **inp, u64 *num, const char **str, int *idx)
 {
     int err = parse_num_or_str(inp, num, str, " ");
 
     if (!err && *str)
         err = parse_sym_idx(inp, idx);
 
     return err;
 }
 
 static int parse_one_filter(struct addr_filter *filt, const char **filter_inp)
 {
     char *fstr;
     int err;
 
     filt->str = fstr = strdup(*filter_inp);
     if (!fstr)
         return -ENOMEM;
 
     err = parse_num_or_str(&fstr, NULL, &filt->action, " ");
     if (err)
         goto out_err;
 
     err = parse_action(filt);
     if (err)
         goto out_err;
 
     err = parse_addr_size(&fstr, &filt->addr, &filt->sym_from,
                   &filt->sym_from_idx);
     if (err)
         goto out_err;
 
     fstr += strspn(fstr, " ");
 
     if (*fstr == '/') {
         fstr += 1;
         err = parse_addr_size(&fstr, &filt->size, &filt->sym_to,
                       &filt->sym_to_idx);
         if (err)
             goto out_err;
         filt->range = true;
     }
 
     fstr += strspn(fstr, " ");
 
     if (*fstr == '@') {
         fstr += 1;
         err = parse_num_or_str(&fstr, NULL, &filt->filename, " ,");
         if (err)
             goto out_err;
     }
 
     fstr += strspn(fstr, " ,");
 
     *filter_inp += fstr - filt->str;
 
     return 0;
 
 out_err:
     addr_filter__free_str(filt);
 
     return err;
 }
 
 int addr_filters__parse_bare_filter(struct addr_filters *filts,
                     const char *filter)
 {
     struct addr_filter *filt;
     const char *fstr = filter;
     int err;
 
     while (*fstr) {
         filt = addr_filter__new();
         err = parse_one_filter(filt, &fstr);
         if (err) {
             addr_filter__free(filt);
             addr_filters__exit(filts);
             return err;
         }
         addr_filters__add(filts, filt);
     }
 
     return 0;
 }
 
 struct sym_args {
     const char  *name;
     u64     start;
     u64     size;
     int     idx;
     int     cnt;
     bool        started;
     bool        global;
     bool        selected;
     bool        duplicate;
     bool        near;
 };
 
 static bool kern_sym_match(struct sym_args *args, const char *name, char type)
 {
     /* A function with the same name, and global or the n'th found or any */
     return kallsyms__is_function(type) &&
            !strcmp(name, args->name) &&
            ((args->global && isupper(type)) ||
         (args->selected && ++(args->cnt) == args->idx) ||
         (!args->global && !args->selected));
 }
 
 static int find_kern_sym_cb(void *arg, const char *name, char type, u64 start)
 {
     struct sym_args *args = arg;
 
     if (args->started) {
         if (!args->size)
             args->size = start - args->start;
         if (args->selected) {
             if (args->size)
                 return 1;
         } else if (kern_sym_match(args, name, type)) {
             args->duplicate = true;
             return 1;
         }
     } else if (kern_sym_match(args, name, type)) {
         args->started = true;
         args->start = start;
     }
 
     return 0;
 }
 
 static int print_kern_sym_cb(void *arg, const char *name, char type, u64 start)
 {
     struct sym_args *args = arg;
 
     if (kern_sym_match(args, name, type)) {
         pr_err("#%d\t0x%"PRIx64"\t%c\t%s\n",
                ++args->cnt, start, type, name);
         args->near = true;
     } else if (args->near) {
         args->near = false;
         pr_err("\t\twhich is near\t\t%s\n", name);
     }
 
     return 0;
 }
 
 static int sym_not_found_error(const char *sym_name, int idx)
 {
     if (idx > 0) {
         pr_err("N'th occurrence (N=%d) of symbol '%s' not found.\n",
                idx, sym_name);
     } else if (!idx) {
         pr_err("Global symbol '%s' not found.\n", sym_name);
     } else {
         pr_err("Symbol '%s' not found.\n", sym_name);
     }
     pr_err("Note that symbols must be functions.\n");
 
     return -EINVAL;
 }
 
 static int find_kern_sym(const char *sym_name, u64 *start, u64 *size, int idx)
 {
     struct sym_args args = {
         .name = sym_name,
         .idx = idx,
         .global = !idx,
         .selected = idx > 0,
     };
     int err;
 
     *start = 0;
     *size = 0;
 
     err = kallsyms__parse("/proc/kallsyms", &args, find_kern_sym_cb);
     if (err < 0) {
         pr_err("Failed to parse /proc/kallsyms\n");
         return err;
     }
 
     if (args.duplicate) {
         pr_err("Multiple kernel symbols with name '%s'\n", sym_name);
         args.cnt = 0;
         kallsyms__parse("/proc/kallsyms", &args, print_kern_sym_cb);
         pr_err("Disambiguate symbol name by inserting #n after the name e.g. %s #2\n",
                sym_name);
         pr_err("Or select a global symbol by inserting #0 or #g or #G\n");
         return -EINVAL;
     }
 
     if (!args.started) {
         pr_err("Kernel symbol lookup: ");
         return sym_not_found_error(sym_name, idx);
     }
 
     *start = args.start;
     *size = args.size;
 
     return 0;
 }
 
 static int find_entire_kern_cb(void *arg, const char *name __maybe_unused,
                    char type, u64 start)
 {
     struct sym_args *args = arg;
 
     if (!kallsyms__is_function(type))
         return 0;
 
     if (!args->started) {
         args->started = true;
         args->start = start;
     }
     /* Don't know exactly where the kernel ends, so we add a page */
     args->size = round_up(start, page_size) + page_size - args->start;
 
     return 0;
 }
 
 static int addr_filter__entire_kernel(struct addr_filter *filt)
 {
     struct sym_args args = { .started = false };
     int err;
 
     err = kallsyms__parse("/proc/kallsyms", &args, find_entire_kern_cb);
     if (err < 0 || !args.started) {
         pr_err("Failed to parse /proc/kallsyms\n");
         return err;
     }
 
     filt->addr = args.start;
     filt->size = args.size;
 
     return 0;
 }
 
 static int check_end_after_start(struct addr_filter *filt, u64 start, u64 size)
 {
     if (start + size >= filt->addr)
         return 0;
 
     if (filt->sym_from) {
         pr_err("Symbol '%s' (0x%"PRIx64") comes before '%s' (0x%"PRIx64")\n",
                filt->sym_to, start, filt->sym_from, filt->addr);
     } else {
         pr_err("Symbol '%s' (0x%"PRIx64") comes before address 0x%"PRIx64")\n",
                filt->sym_to, start, filt->addr);
     }
 
     return -EINVAL;
 }
 
 static int addr_filter__resolve_kernel_syms(struct addr_filter *filt)
 {
     bool no_size = false;
     u64 start, size;
     int err;
 
     if (symbol_conf.kptr_restrict) {
         pr_err("Kernel addresses are restricted. Unable to resolve kernel symbols.\n");
         return -EINVAL;
     }
 
     if (filt->sym_from && !strcmp(filt->sym_from, "*"))
         return addr_filter__entire_kernel(filt);
 
     if (filt->sym_from) {
         err = find_kern_sym(filt->sym_from, &start, &size,
                     filt->sym_from_idx);
         if (err)
             return err;
         filt->addr = start;
         if (filt->range && !filt->size && !filt->sym_to) {
             filt->size = size;
             no_size = !size;
         }
     }
 
     if (filt->sym_to) {
         err = find_kern_sym(filt->sym_to, &start, &size,
                     filt->sym_to_idx);
         if (err)
             return err;
 
         err = check_end_after_start(filt, start, size);
         if (err)
             return err;
         filt->size = start + size - filt->addr;
         no_size = !size;
     }
 
     /* The very last symbol in kallsyms does not imply a particular size */
     if (no_size) {
         pr_err("Cannot determine size of symbol '%s'\n",
                filt->sym_to ? filt->sym_to : filt->sym_from);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static struct dso *load_dso(const char *name)
 {
     struct map *map;
     struct dso *dso;
 
     map = dso__new_map(name);
     if (!map)
         return NULL;
 
     if (map__load(map) < 0)
         pr_err("File '%s' not found or has no symbols.\n", name);
 
     dso = dso__get(map->dso);
 
     map__put(map);
 
     return dso;
 }
 
 static bool dso_sym_match(struct symbol *sym, const char *name, int *cnt,
               int idx)
 {
     /* Same name, and global or the n'th found or any */
     return !arch__compare_symbol_names(name, sym->name) &&
            ((!idx && sym->binding == STB_GLOBAL) ||
         (idx > 0 && ++*cnt == idx) ||
         idx < 0);
 }
 
 static void print_duplicate_syms(struct dso *dso, const char *sym_name)
 {
     struct symbol *sym;
     bool near = false;
     int cnt = 0;
 
     pr_err("Multiple symbols with name '%s'\n", sym_name);
 
     sym = dso__first_symbol(dso);
     while (sym) {
         if (dso_sym_match(sym, sym_name, &cnt, -1)) {
             pr_err("#%d\t0x%"PRIx64"\t%c\t%s\n",
                    ++cnt, sym->start,
                    sym->binding == STB_GLOBAL ? 'g' :
                    sym->binding == STB_LOCAL  ? 'l' : 'w',
                    sym->name);
             near = true;
         } else if (near) {
             near = false;
             pr_err("\t\twhich is near\t\t%s\n", sym->name);
         }
         sym = dso__next_symbol(sym);
     }
 
     pr_err("Disambiguate symbol name by inserting #n after the name e.g. %s #2\n",
            sym_name);
     pr_err("Or select a global symbol by inserting #0 or #g or #G\n");
 }
 
 static int find_dso_sym(struct dso *dso, const char *sym_name, u64 *start,
             u64 *size, int idx)
 {
     struct symbol *sym;
     int cnt = 0;
 
     *start = 0;
     *size = 0;
 
     sym = dso__first_symbol(dso);
     while (sym) {
         if (*start) {
             if (!*size)
                 *size = sym->start - *start;
             if (idx > 0) {
                 if (*size)
                     return 1;
             } else if (dso_sym_match(sym, sym_name, &cnt, idx)) {
                 print_duplicate_syms(dso, sym_name);
                 return -EINVAL;
             }
         } else if (dso_sym_match(sym, sym_name, &cnt, idx)) {
             *start = sym->start;
             *size = sym->end - sym->start;
         }
         sym = dso__next_symbol(sym);
     }
 
     if (!*start)
         return sym_not_found_error(sym_name, idx);
 
     return 0;
 }
 
 static int addr_filter__entire_dso(struct addr_filter *filt, struct dso *dso)
 {
     if (dso__data_file_size(dso, NULL)) {
         pr_err("Failed to determine filter for %s\nCannot determine file size.\n",
                filt->filename);
         return -EINVAL;
     }
 
     filt->addr = 0;
     filt->size = dso->data.file_size;
 
     return 0;
 }
 
 static int addr_filter__resolve_syms(struct addr_filter *filt)
 {
     u64 start, size;
     struct dso *dso;
     int err = 0;
 
     if (!filt->sym_from && !filt->sym_to)
         return 0;
 
     if (!filt->filename)
         return addr_filter__resolve_kernel_syms(filt);
 
     dso = load_dso(filt->filename);
     if (!dso) {
         pr_err("Failed to load symbols from: %s\n", filt->filename);
         return -EINVAL;
     }
 
     if (filt->sym_from && !strcmp(filt->sym_from, "*")) {
         err = addr_filter__entire_dso(filt, dso);
         goto put_dso;
     }
 
     if (filt->sym_from) {
         err = find_dso_sym(dso, filt->sym_from, &start, &size,
                    filt->sym_from_idx);
         if (err)
             goto put_dso;
         filt->addr = start;
         if (filt->range && !filt->size && !filt->sym_to)
             filt->size = size;
     }
 
     if (filt->sym_to) {
         err = find_dso_sym(dso, filt->sym_to, &start, &size,
                    filt->sym_to_idx);
         if (err)
             goto put_dso;
 
         err = check_end_after_start(filt, start, size);
         if (err)
             return err;
 
         filt->size = start + size - filt->addr;
     }
 
 put_dso:
     dso__put(dso);
 
     return err;
 }
 
 static char *addr_filter__to_str(struct addr_filter *filt)
 {
     char filename_buf[PATH_MAX];
     const char *at = "";
     const char *fn = "";
     char *filter;
     int err;
 
     if (filt->filename) {
         at = "@";
         fn = realpath(filt->filename, filename_buf);
         if (!fn)
             return NULL;
     }
 
     if (filt->range) {
         err = asprintf(&filter, "%s 0x%"PRIx64"/0x%"PRIx64"%s%s",
                    filt->action, filt->addr, filt->size, at, fn);
     } else {
         err = asprintf(&filter, "%s 0x%"PRIx64"%s%s",
                    filt->action, filt->addr, at, fn);
     }
 
     return err < 0 ? NULL : filter;
 }
 
 static int parse_addr_filter(struct evsel *evsel, const char *filter,
                  int max_nr)
 {
     struct addr_filters filts;
     struct addr_filter *filt;
     int err;
 
     addr_filters__init(&filts);
 
     err = addr_filters__parse_bare_filter(&filts, filter);
     if (err)
         goto out_exit;
 
     if (filts.cnt > max_nr) {
         pr_err("Error: number of address filters (%d) exceeds maximum (%d)\n",
                filts.cnt, max_nr);
         err = -EINVAL;
         goto out_exit;
     }
 
     list_for_each_entry(filt, &filts.head, list) {
         char *new_filter;
 
         err = addr_filter__resolve_syms(filt);
         if (err)
             goto out_exit;
 
         new_filter = addr_filter__to_str(filt);
         if (!new_filter) {
             err = -ENOMEM;
             goto out_exit;
         }
 
         if (evsel__append_addr_filter(evsel, new_filter)) {
             err = -ENOMEM;
             goto out_exit;
         }
     }
 
 out_exit:
     addr_filters__exit(&filts);
 
     if (err) {
         pr_err("Failed to parse address filter: '%s'\n", filter);
         pr_err("Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]\n");
         pr_err("Where multiple filters are separated by space or comma.\n");
     }
 
     return err;
 }
 
 static int evsel__nr_addr_filter(struct evsel *evsel)
 {
     struct perf_pmu *pmu = evsel__find_pmu(evsel);
     int nr_addr_filters = 0;
 
     if (!pmu)
         return 0;
 
     perf_pmu__scan_file(pmu, "nr_addr_filters", "%d", &nr_addr_filters);
 
     return nr_addr_filters;
 }
 
 int auxtrace_parse_filters(struct evlist *evlist)
 {
     struct evsel *evsel;
     char *filter;
     int err, max_nr;
 
     evlist__for_each_entry(evlist, evsel) {
         filter = evsel->filter;
         max_nr = evsel__nr_addr_filter(evsel);
         if (!filter || !max_nr)
             continue;
         evsel->filter = NULL;
         err = parse_addr_filter(evsel, filter, max_nr);
         free(filter);
         if (err)
             return err;
         pr_debug("Address filter: %s\n", evsel->filter);
     }
 
     return 0;
 }
 
 int auxtrace__process_event(struct perf_session *session, union perf_event *event,
                 struct perf_sample *sample, struct perf_tool *tool)
 {
     if (!session->auxtrace)
         return 0;
 
     return session->auxtrace->process_event(session, event, sample, tool);
 }
 
 void auxtrace__dump_auxtrace_sample(struct perf_session *session,
                     struct perf_sample *sample)
 {
     if (!session->auxtrace || !session->auxtrace->dump_auxtrace_sample ||
         auxtrace__dont_decode(session))
         return;
 
     session->auxtrace->dump_auxtrace_sample(session, sample);
 }
 
 int auxtrace__flush_events(struct perf_session *session, struct perf_tool *tool)
 {
     if (!session->auxtrace)
         return 0;
 
     return session->auxtrace->flush_events(session, tool);
 }
 
 void auxtrace__free_events(struct perf_session *session)
 {
     if (!session->auxtrace)
         return;
 
     return session->auxtrace->free_events(session);
 }
 
 void auxtrace__free(struct perf_session *session)
 {
     if (!session->auxtrace)
         return;
 
     return session->auxtrace->free(session);
 }
 
 bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
                  struct evsel *evsel)
 {
     if (!session->auxtrace || !session->auxtrace->evsel_is_auxtrace)
         return false;
 
     return session->auxtrace->evsel_is_auxtrace(session, evsel);
 }