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- /*
- * auxtrace.c: AUX area trace support
- * Copyright (c) 2013-2015, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- */
- #include <sys/types.h>
- #include <sys/mman.h>
- #include <stdbool.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 <sys/param.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <limits.h>
- #include <errno.h>
- #include <linux/list.h>
- #include "../perf.h"
- #include "util.h"
- #include "evlist.h"
- #include "cpumap.h"
- #include "thread_map.h"
- #include "asm/bug.h"
- #include "auxtrace.h"
- #include <linux/hash.h>
- #include "event.h"
- #include "session.h"
- #include "debug.h"
- #include "parse-options.h"
- #include "intel-pt.h"
- #include "intel-bts.h"
- 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;
- if (!mp->len) {
- mm->base = NULL;
- return 0;
- }
- #if BITS_PER_LONG != 64 && !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
- pr_err("Cannot use AUX area tracing mmaps\n");
- return -1;
- #endif
- 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 perf_evlist *evlist, int idx,
- bool per_cpu)
- {
- mp->idx = idx;
- if (per_cpu) {
- mp->cpu = evlist->cpus->map[idx];
- if (evlist->threads)
- mp->tid = thread_map__pid(evlist->threads, 0);
- else
- mp->tid = -1;
- } else {
- mp->cpu = -1;
- mp->tid = thread_map__pid(evlist->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_file__fd(session->file);
- 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__add_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;
- } else if (buffer->cpu != queue->cpu || buffer->tid != queue->tid) {
- pr_err("auxtrace queue conflict: cpu %d, tid %d vs cpu %d, tid %d\n",
- queue->cpu, queue->tid, buffer->cpu, buffer->tid);
- return -EINVAL;
- }
- 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__add_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 int auxtrace_queues__add_event_buffer(struct auxtrace_queues *queues,
- struct perf_session *session,
- unsigned int idx,
- struct auxtrace_buffer *buffer)
- {
- if (session->one_mmap) {
- buffer->data = buffer->data_offset - session->one_mmap_offset +
- session->one_mmap_addr;
- } else if (perf_data_file__is_pipe(session->file)) {
- buffer->data = auxtrace_copy_data(buffer->size, session);
- if (!buffer->data)
- return -ENOMEM;
- buffer->data_needs_freeing = true;
- } else if (BITS_PER_LONG == 32 &&
- buffer->size > BUFFER_LIMIT_FOR_32_BIT) {
- int err;
- err = auxtrace_queues__split_buffer(queues, idx, buffer);
- if (err)
- return err;
- }
- return auxtrace_queues__add_buffer(queues, idx, buffer);
- }
- 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;
- unsigned int idx;
- int err;
- buffer = zalloc(sizeof(struct auxtrace_buffer));
- if (!buffer)
- return -ENOMEM;
- buffer->pid = -1;
- buffer->tid = event->auxtrace.tid;
- buffer->cpu = event->auxtrace.cpu;
- buffer->data_offset = data_offset;
- buffer->offset = event->auxtrace.offset;
- buffer->reference = event->auxtrace.reference;
- buffer->size = event->auxtrace.size;
- idx = event->auxtrace.idx;
- err = auxtrace_queues__add_event_buffer(queues, session, idx, buffer);
- if (err)
- goto out_err;
- if (buffer_ptr)
- *buffer_ptr = buffer;
- return 0;
- out_err:
- auxtrace_buffer__free(buffer);
- return err;
- }
- 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 auxtrace_event) ||
- 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(&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)
- {
- if (itr)
- return itr->info_priv_size(itr);
- 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 auxtrace_info_event *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)
- {
- if (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 perf_evlist *evlist,
- struct record_opts *opts)
- {
- if (itr)
- 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;
- if (itr)
- return itr->parse_snapshot_options(itr, opts, str);
- pr_err("No AUX area tracing to snapshot\n");
- return -EINVAL;
- }
- struct auxtrace_record *__weak
- auxtrace_record__init(struct perf_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(&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;
- 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);
- }
- }
- void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
- {
- 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_READ, 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_error(struct auxtrace_error_event *auxtrace_error, int type,
- int code, int cpu, pid_t pid, pid_t tid, u64 ip,
- const char *msg)
- {
- size_t size;
- memset(auxtrace_error, 0, sizeof(struct auxtrace_error_event));
- 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->ip = ip;
- strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
- size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
- strlen(auxtrace_error->msg) + 1;
- auxtrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
- }
- 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);
- ev = zalloc(sizeof(struct auxtrace_info_event) + priv_size);
- if (!ev)
- return -ENOMEM;
- ev->auxtrace_info.header.type = PERF_RECORD_AUXTRACE_INFO;
- ev->auxtrace_info.header.size = sizeof(struct auxtrace_info_event) +
- 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 bool auxtrace__dont_decode(struct perf_session *session)
- {
- return !session->itrace_synth_opts ||
- session->itrace_synth_opts->dont_decode;
- }
- int perf_event__process_auxtrace_info(struct perf_tool *tool __maybe_unused,
- union perf_event *event,
- struct perf_session *session)
- {
- enum auxtrace_type type = event->auxtrace_info.type;
- if (dump_trace)
- fprintf(stdout, " type: %u\n", type);
- switch (type) {
- case PERF_AUXTRACE_INTEL_PT:
- return intel_pt_process_auxtrace_info(event, session);
- case PERF_AUXTRACE_INTEL_BTS:
- return intel_bts_process_auxtrace_info(event, session);
- case PERF_AUXTRACE_UNKNOWN:
- default:
- return -EINVAL;
- }
- }
- s64 perf_event__process_auxtrace(struct perf_tool *tool,
- union perf_event *event,
- struct perf_session *session)
- {
- s64 err;
- if (dump_trace)
- fprintf(stdout, " size: %#"PRIx64" offset: %#"PRIx64" ref: %#"PRIx64" 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, 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)
- {
- synth_opts->instructions = true;
- synth_opts->branches = true;
- synth_opts->transactions = true;
- synth_opts->errors = 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;
- }
- /*
- * 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_parse_synth_opts(const struct option *opt, const char *str,
- int unset)
- {
- struct itrace_synth_opts *synth_opts = opt->value;
- 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);
- 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 'e':
- synth_opts->errors = true;
- break;
- case 'd':
- synth_opts->log = true;
- 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':
- 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':
- 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 ' ':
- 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;
- }
- 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 auxtrace_error_event *e = &event->auxtrace_error;
- int ret;
- ret = fprintf(fp, " %s error type %u",
- auxtrace_error_name(e->type), e->type);
- ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
- e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
- return ret;
- }
- void perf_session__auxtrace_error_inc(struct perf_session *session,
- union perf_event *event)
- {
- struct auxtrace_error_event *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_tool *tool __maybe_unused,
- union perf_event *event,
- struct perf_session *session)
- {
- if (auxtrace__dont_decode(session))
- return 0;
- perf_event__fprintf_auxtrace_error(event, stdout);
- return 0;
- }
- static int __auxtrace_mmap__read(struct auxtrace_mmap *mm,
- struct auxtrace_record *itr,
- struct perf_tool *tool, process_auxtrace_t fn,
- bool snapshot, size_t snapshot_size)
- {
- 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;
- if (snapshot) {
- head = auxtrace_mmap__read_snapshot_head(mm);
- if (auxtrace_record__find_snapshot(itr, mm->idx, mm, data,
- &head, &old))
- return -1;
- } else {
- head = auxtrace_mmap__read_head(mm);
- }
- 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, &ev, data1, len1, data2, len2))
- return -1;
- mm->prev = head;
- if (!snapshot) {
- auxtrace_mmap__write_tail(mm, head);
- if (itr->read_finish) {
- int err;
- err = itr->read_finish(itr, mm->idx);
- if (err < 0)
- return err;
- }
- }
- return 1;
- }
- int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
- struct perf_tool *tool, process_auxtrace_t fn)
- {
- return __auxtrace_mmap__read(mm, itr, tool, fn, false, 0);
- }
- int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm,
- struct auxtrace_record *itr,
- struct perf_tool *tool, process_auxtrace_t fn,
- size_t snapshot_size)
- {
- return __auxtrace_mmap__read(mm, 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);
- free(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;
- }
- 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;
- }
|