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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
To allow for destructors to check if they're operating on a object still in a list, and to avoid going from use after free list entries into still valid, or even also other already removed from list entries. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-deh17ub44atyox3j90e6rksu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2183 lines
48 KiB
C
2183 lines
48 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* auxtrace.c: AUX area trace support
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* Copyright (c) 2013-2015, Intel Corporation.
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*/
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <stdbool.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <linux/kernel.h>
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#include <linux/perf_event.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/log2.h>
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#include <linux/string.h>
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#include <linux/time64.h>
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#include <sys/param.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <linux/list.h>
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#include <linux/zalloc.h>
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#include "../perf.h"
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#include "evlist.h"
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#include "dso.h"
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#include "map.h"
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#include "pmu.h"
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#include "evsel.h"
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#include "cpumap.h"
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#include "symbol.h"
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#include "thread_map.h"
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#include "asm/bug.h"
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#include "auxtrace.h"
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#include <linux/hash.h>
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#include "event.h"
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#include "session.h"
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#include "debug.h"
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#include <subcmd/parse-options.h>
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#include "cs-etm.h"
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#include "intel-pt.h"
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#include "intel-bts.h"
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#include "arm-spe.h"
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#include "s390-cpumsf.h"
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#include <linux/ctype.h>
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#include "symbol/kallsyms.h"
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static bool auxtrace__dont_decode(struct perf_session *session)
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{
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return !session->itrace_synth_opts ||
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session->itrace_synth_opts->dont_decode;
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}
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int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
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struct auxtrace_mmap_params *mp,
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void *userpg, int fd)
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{
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struct perf_event_mmap_page *pc = userpg;
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WARN_ONCE(mm->base, "Uninitialized auxtrace_mmap\n");
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mm->userpg = userpg;
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mm->mask = mp->mask;
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mm->len = mp->len;
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mm->prev = 0;
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mm->idx = mp->idx;
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mm->tid = mp->tid;
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mm->cpu = mp->cpu;
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if (!mp->len) {
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mm->base = NULL;
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return 0;
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}
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#if BITS_PER_LONG != 64 && !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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pr_err("Cannot use AUX area tracing mmaps\n");
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return -1;
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#endif
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pc->aux_offset = mp->offset;
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pc->aux_size = mp->len;
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mm->base = mmap(NULL, mp->len, mp->prot, MAP_SHARED, fd, mp->offset);
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if (mm->base == MAP_FAILED) {
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pr_debug2("failed to mmap AUX area\n");
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mm->base = NULL;
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return -1;
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}
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return 0;
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}
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void auxtrace_mmap__munmap(struct auxtrace_mmap *mm)
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{
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if (mm->base) {
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munmap(mm->base, mm->len);
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mm->base = NULL;
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}
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}
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void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
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off_t auxtrace_offset,
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unsigned int auxtrace_pages,
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bool auxtrace_overwrite)
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{
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if (auxtrace_pages) {
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mp->offset = auxtrace_offset;
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mp->len = auxtrace_pages * (size_t)page_size;
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mp->mask = is_power_of_2(mp->len) ? mp->len - 1 : 0;
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mp->prot = PROT_READ | (auxtrace_overwrite ? 0 : PROT_WRITE);
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pr_debug2("AUX area mmap length %zu\n", mp->len);
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} else {
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mp->len = 0;
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}
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}
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void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
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struct perf_evlist *evlist, int idx,
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bool per_cpu)
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{
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mp->idx = idx;
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if (per_cpu) {
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mp->cpu = evlist->cpus->map[idx];
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if (evlist->threads)
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mp->tid = thread_map__pid(evlist->threads, 0);
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else
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mp->tid = -1;
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} else {
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mp->cpu = -1;
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mp->tid = thread_map__pid(evlist->threads, idx);
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}
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}
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#define AUXTRACE_INIT_NR_QUEUES 32
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static struct auxtrace_queue *auxtrace_alloc_queue_array(unsigned int nr_queues)
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{
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struct auxtrace_queue *queue_array;
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unsigned int max_nr_queues, i;
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max_nr_queues = UINT_MAX / sizeof(struct auxtrace_queue);
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if (nr_queues > max_nr_queues)
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return NULL;
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queue_array = calloc(nr_queues, sizeof(struct auxtrace_queue));
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if (!queue_array)
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return NULL;
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for (i = 0; i < nr_queues; i++) {
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INIT_LIST_HEAD(&queue_array[i].head);
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queue_array[i].priv = NULL;
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}
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return queue_array;
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}
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int auxtrace_queues__init(struct auxtrace_queues *queues)
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{
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queues->nr_queues = AUXTRACE_INIT_NR_QUEUES;
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queues->queue_array = auxtrace_alloc_queue_array(queues->nr_queues);
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if (!queues->queue_array)
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return -ENOMEM;
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return 0;
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}
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static int auxtrace_queues__grow(struct auxtrace_queues *queues,
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unsigned int new_nr_queues)
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{
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unsigned int nr_queues = queues->nr_queues;
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struct auxtrace_queue *queue_array;
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unsigned int i;
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if (!nr_queues)
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nr_queues = AUXTRACE_INIT_NR_QUEUES;
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while (nr_queues && nr_queues < new_nr_queues)
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nr_queues <<= 1;
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if (nr_queues < queues->nr_queues || nr_queues < new_nr_queues)
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return -EINVAL;
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queue_array = auxtrace_alloc_queue_array(nr_queues);
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if (!queue_array)
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return -ENOMEM;
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for (i = 0; i < queues->nr_queues; i++) {
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list_splice_tail(&queues->queue_array[i].head,
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&queue_array[i].head);
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queue_array[i].tid = queues->queue_array[i].tid;
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queue_array[i].cpu = queues->queue_array[i].cpu;
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queue_array[i].set = queues->queue_array[i].set;
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queue_array[i].priv = queues->queue_array[i].priv;
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}
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queues->nr_queues = nr_queues;
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queues->queue_array = queue_array;
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return 0;
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}
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static void *auxtrace_copy_data(u64 size, struct perf_session *session)
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{
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int fd = perf_data__fd(session->data);
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void *p;
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ssize_t ret;
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if (size > SSIZE_MAX)
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return NULL;
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p = malloc(size);
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if (!p)
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return NULL;
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ret = readn(fd, p, size);
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if (ret != (ssize_t)size) {
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free(p);
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return NULL;
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}
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return p;
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}
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static int auxtrace_queues__queue_buffer(struct auxtrace_queues *queues,
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unsigned int idx,
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struct auxtrace_buffer *buffer)
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{
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struct auxtrace_queue *queue;
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int err;
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if (idx >= queues->nr_queues) {
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err = auxtrace_queues__grow(queues, idx + 1);
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if (err)
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return err;
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}
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queue = &queues->queue_array[idx];
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if (!queue->set) {
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queue->set = true;
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queue->tid = buffer->tid;
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queue->cpu = buffer->cpu;
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} else if (buffer->cpu != queue->cpu || buffer->tid != queue->tid) {
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pr_err("auxtrace queue conflict: cpu %d, tid %d vs cpu %d, tid %d\n",
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queue->cpu, queue->tid, buffer->cpu, buffer->tid);
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return -EINVAL;
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}
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buffer->buffer_nr = queues->next_buffer_nr++;
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list_add_tail(&buffer->list, &queue->head);
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queues->new_data = true;
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queues->populated = true;
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return 0;
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}
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/* Limit buffers to 32MiB on 32-bit */
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#define BUFFER_LIMIT_FOR_32_BIT (32 * 1024 * 1024)
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static int auxtrace_queues__split_buffer(struct auxtrace_queues *queues,
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unsigned int idx,
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struct auxtrace_buffer *buffer)
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{
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u64 sz = buffer->size;
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bool consecutive = false;
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struct auxtrace_buffer *b;
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int err;
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while (sz > BUFFER_LIMIT_FOR_32_BIT) {
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b = memdup(buffer, sizeof(struct auxtrace_buffer));
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if (!b)
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return -ENOMEM;
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b->size = BUFFER_LIMIT_FOR_32_BIT;
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b->consecutive = consecutive;
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err = auxtrace_queues__queue_buffer(queues, idx, b);
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if (err) {
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auxtrace_buffer__free(b);
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return err;
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}
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buffer->data_offset += BUFFER_LIMIT_FOR_32_BIT;
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sz -= BUFFER_LIMIT_FOR_32_BIT;
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consecutive = true;
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}
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buffer->size = sz;
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buffer->consecutive = consecutive;
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return 0;
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}
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static bool filter_cpu(struct perf_session *session, int cpu)
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{
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unsigned long *cpu_bitmap = session->itrace_synth_opts->cpu_bitmap;
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return cpu_bitmap && cpu != -1 && !test_bit(cpu, cpu_bitmap);
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}
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static int auxtrace_queues__add_buffer(struct auxtrace_queues *queues,
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struct perf_session *session,
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unsigned int idx,
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struct auxtrace_buffer *buffer,
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struct auxtrace_buffer **buffer_ptr)
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{
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int err = -ENOMEM;
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if (filter_cpu(session, buffer->cpu))
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return 0;
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buffer = memdup(buffer, sizeof(*buffer));
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if (!buffer)
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return -ENOMEM;
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if (session->one_mmap) {
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buffer->data = buffer->data_offset - session->one_mmap_offset +
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session->one_mmap_addr;
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} else if (perf_data__is_pipe(session->data)) {
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buffer->data = auxtrace_copy_data(buffer->size, session);
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if (!buffer->data)
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goto out_free;
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buffer->data_needs_freeing = true;
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} else if (BITS_PER_LONG == 32 &&
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buffer->size > BUFFER_LIMIT_FOR_32_BIT) {
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err = auxtrace_queues__split_buffer(queues, idx, buffer);
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if (err)
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goto out_free;
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}
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err = auxtrace_queues__queue_buffer(queues, idx, buffer);
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if (err)
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goto out_free;
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/* FIXME: Doesn't work for split buffer */
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if (buffer_ptr)
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*buffer_ptr = buffer;
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return 0;
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out_free:
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auxtrace_buffer__free(buffer);
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return err;
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}
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int auxtrace_queues__add_event(struct auxtrace_queues *queues,
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struct perf_session *session,
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union perf_event *event, off_t data_offset,
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struct auxtrace_buffer **buffer_ptr)
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{
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struct auxtrace_buffer buffer = {
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.pid = -1,
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.tid = event->auxtrace.tid,
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.cpu = event->auxtrace.cpu,
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.data_offset = data_offset,
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.offset = event->auxtrace.offset,
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.reference = event->auxtrace.reference,
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.size = event->auxtrace.size,
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};
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unsigned int idx = event->auxtrace.idx;
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return auxtrace_queues__add_buffer(queues, session, idx, &buffer,
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buffer_ptr);
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}
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static int auxtrace_queues__add_indexed_event(struct auxtrace_queues *queues,
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struct perf_session *session,
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off_t file_offset, size_t sz)
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{
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union perf_event *event;
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int err;
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char buf[PERF_SAMPLE_MAX_SIZE];
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err = perf_session__peek_event(session, file_offset, buf,
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PERF_SAMPLE_MAX_SIZE, &event, NULL);
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if (err)
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return err;
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if (event->header.type == PERF_RECORD_AUXTRACE) {
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if (event->header.size < sizeof(struct auxtrace_event) ||
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event->header.size != sz) {
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err = -EINVAL;
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goto out;
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}
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file_offset += event->header.size;
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err = auxtrace_queues__add_event(queues, session, event,
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file_offset, NULL);
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}
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out:
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return err;
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}
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void auxtrace_queues__free(struct auxtrace_queues *queues)
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{
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unsigned int i;
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for (i = 0; i < queues->nr_queues; i++) {
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while (!list_empty(&queues->queue_array[i].head)) {
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struct auxtrace_buffer *buffer;
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buffer = list_entry(queues->queue_array[i].head.next,
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struct auxtrace_buffer, list);
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list_del_init(&buffer->list);
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auxtrace_buffer__free(buffer);
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}
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}
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zfree(&queues->queue_array);
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queues->nr_queues = 0;
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}
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static void auxtrace_heapify(struct auxtrace_heap_item *heap_array,
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unsigned int pos, unsigned int queue_nr,
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u64 ordinal)
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{
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unsigned int parent;
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while (pos) {
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parent = (pos - 1) >> 1;
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if (heap_array[parent].ordinal <= ordinal)
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break;
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heap_array[pos] = heap_array[parent];
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pos = parent;
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}
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heap_array[pos].queue_nr = queue_nr;
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heap_array[pos].ordinal = ordinal;
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}
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int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
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u64 ordinal)
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{
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struct auxtrace_heap_item *heap_array;
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if (queue_nr >= heap->heap_sz) {
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unsigned int heap_sz = AUXTRACE_INIT_NR_QUEUES;
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while (heap_sz <= queue_nr)
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heap_sz <<= 1;
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heap_array = realloc(heap->heap_array,
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heap_sz * sizeof(struct auxtrace_heap_item));
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if (!heap_array)
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return -ENOMEM;
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heap->heap_array = heap_array;
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heap->heap_sz = heap_sz;
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}
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auxtrace_heapify(heap->heap_array, heap->heap_cnt++, queue_nr, ordinal);
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return 0;
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}
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void auxtrace_heap__free(struct auxtrace_heap *heap)
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{
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zfree(&heap->heap_array);
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heap->heap_cnt = 0;
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heap->heap_sz = 0;
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}
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void auxtrace_heap__pop(struct auxtrace_heap *heap)
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{
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unsigned int pos, last, heap_cnt = heap->heap_cnt;
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struct auxtrace_heap_item *heap_array;
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if (!heap_cnt)
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return;
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heap->heap_cnt -= 1;
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heap_array = heap->heap_array;
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pos = 0;
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while (1) {
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unsigned int left, right;
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left = (pos << 1) + 1;
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if (left >= heap_cnt)
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break;
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right = left + 1;
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if (right >= heap_cnt) {
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heap_array[pos] = heap_array[left];
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return;
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}
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if (heap_array[left].ordinal < heap_array[right].ordinal) {
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heap_array[pos] = heap_array[left];
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pos = left;
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} else {
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heap_array[pos] = heap_array[right];
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pos = right;
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}
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}
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last = heap_cnt - 1;
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auxtrace_heapify(heap_array, pos, heap_array[last].queue_nr,
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heap_array[last].ordinal);
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}
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size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr,
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struct perf_evlist *evlist)
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{
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if (itr)
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return itr->info_priv_size(itr, evlist);
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return 0;
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}
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static int auxtrace_not_supported(void)
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{
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pr_err("AUX area tracing is not supported on this architecture\n");
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return -EINVAL;
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}
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int auxtrace_record__info_fill(struct auxtrace_record *itr,
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struct perf_session *session,
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struct auxtrace_info_event *auxtrace_info,
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size_t priv_size)
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{
|
|
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_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);
|
|
}
|
|
}
|
|
|
|
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, u64 timestamp)
|
|
{
|
|
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->fmt = 1;
|
|
auxtrace_error->ip = ip;
|
|
auxtrace_error->time = timestamp;
|
|
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, session->evlist);
|
|
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;
|
|
}
|
|
|
|
int perf_event__process_auxtrace_info(struct perf_session *session,
|
|
union perf_event *event)
|
|
{
|
|
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_ARM_SPE:
|
|
return arm_spe_process_auxtrace_info(event, session);
|
|
case PERF_AUXTRACE_CS_ETM:
|
|
return cs_etm__process_auxtrace_info(event, session);
|
|
case PERF_AUXTRACE_S390_CPUMSF:
|
|
return s390_cpumsf_process_auxtrace_info(event, session);
|
|
case PERF_AUXTRACE_UNKNOWN:
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
s64 perf_event__process_auxtrace(struct perf_session *session,
|
|
union perf_event *event)
|
|
{
|
|
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, 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->errors = 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;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
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 '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 's':
|
|
synth_opts->initial_skip = strtoul(p, &endptr, 10);
|
|
if (p == endptr)
|
|
goto out_err;
|
|
p = endptr;
|
|
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;
|
|
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;
|
|
|
|
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, 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_session *session,
|
|
union perf_event *event)
|
|
{
|
|
if (auxtrace__dont_decode(session))
|
|
return 0;
|
|
|
|
perf_event__fprintf_auxtrace_error(event, stdout);
|
|
return 0;
|
|
}
|
|
|
|
static int __auxtrace_mmap__read(struct perf_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;
|
|
|
|
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, map, &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 perf_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 perf_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;
|
|
}
|
|
|
|
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 perf_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 (perf_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 struct perf_pmu *perf_evsel__find_pmu(struct perf_evsel *evsel)
|
|
{
|
|
struct perf_pmu *pmu = NULL;
|
|
|
|
while ((pmu = perf_pmu__scan(pmu)) != NULL) {
|
|
if (pmu->type == evsel->attr.type)
|
|
break;
|
|
}
|
|
|
|
return pmu;
|
|
}
|
|
|
|
static int perf_evsel__nr_addr_filter(struct perf_evsel *evsel)
|
|
{
|
|
struct perf_pmu *pmu = perf_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 perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
char *filter;
|
|
int err, max_nr;
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
filter = evsel->filter;
|
|
max_nr = perf_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;
|
|
}
|