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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Eroding a bit more the tools/perf/util/util.h hodpodge header. 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-natazosyn9rwjka25tvcnyi0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
540 lines
13 KiB
C
540 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further
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* copyright notes.
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*/
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#include <sys/mman.h>
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#include <inttypes.h>
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#include <asm/bug.h>
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#include <linux/zalloc.h>
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#ifdef HAVE_LIBNUMA_SUPPORT
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#include <numaif.h>
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#endif
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#include "debug.h"
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#include "event.h"
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#include "mmap.h"
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#include "util.h" /* page_size */
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size_t perf_mmap__mmap_len(struct perf_mmap *map)
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{
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return map->mask + 1 + page_size;
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}
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/* When check_messup is true, 'end' must points to a good entry */
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static union perf_event *perf_mmap__read(struct perf_mmap *map,
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u64 *startp, u64 end)
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{
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unsigned char *data = map->base + page_size;
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union perf_event *event = NULL;
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int diff = end - *startp;
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if (diff >= (int)sizeof(event->header)) {
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size_t size;
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event = (union perf_event *)&data[*startp & map->mask];
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size = event->header.size;
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if (size < sizeof(event->header) || diff < (int)size)
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return NULL;
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/*
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* Event straddles the mmap boundary -- header should always
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* be inside due to u64 alignment of output.
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*/
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if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {
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unsigned int offset = *startp;
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unsigned int len = min(sizeof(*event), size), cpy;
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void *dst = map->event_copy;
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do {
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cpy = min(map->mask + 1 - (offset & map->mask), len);
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memcpy(dst, &data[offset & map->mask], cpy);
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offset += cpy;
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dst += cpy;
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len -= cpy;
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} while (len);
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event = (union perf_event *)map->event_copy;
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}
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*startp += size;
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}
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return event;
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}
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/*
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* Read event from ring buffer one by one.
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* Return one event for each call.
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*
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* Usage:
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* perf_mmap__read_init()
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* while(event = perf_mmap__read_event()) {
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* //process the event
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* perf_mmap__consume()
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* }
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* perf_mmap__read_done()
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*/
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union perf_event *perf_mmap__read_event(struct perf_mmap *map)
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{
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union perf_event *event;
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/*
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* Check if event was unmapped due to a POLLHUP/POLLERR.
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*/
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if (!refcount_read(&map->refcnt))
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return NULL;
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/* non-overwirte doesn't pause the ringbuffer */
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if (!map->overwrite)
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map->end = perf_mmap__read_head(map);
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event = perf_mmap__read(map, &map->start, map->end);
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if (!map->overwrite)
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map->prev = map->start;
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return event;
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}
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static bool perf_mmap__empty(struct perf_mmap *map)
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{
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return perf_mmap__read_head(map) == map->prev && !map->auxtrace_mmap.base;
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}
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void perf_mmap__get(struct perf_mmap *map)
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{
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refcount_inc(&map->refcnt);
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}
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void perf_mmap__put(struct perf_mmap *map)
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{
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BUG_ON(map->base && refcount_read(&map->refcnt) == 0);
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if (refcount_dec_and_test(&map->refcnt))
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perf_mmap__munmap(map);
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}
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void perf_mmap__consume(struct perf_mmap *map)
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{
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if (!map->overwrite) {
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u64 old = map->prev;
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perf_mmap__write_tail(map, old);
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}
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if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))
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perf_mmap__put(map);
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}
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int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
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struct auxtrace_mmap_params *mp __maybe_unused,
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void *userpg __maybe_unused,
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int fd __maybe_unused)
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{
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return 0;
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}
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void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
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{
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}
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void __weak auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp __maybe_unused,
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off_t auxtrace_offset __maybe_unused,
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unsigned int auxtrace_pages __maybe_unused,
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bool auxtrace_overwrite __maybe_unused)
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{
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}
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void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __maybe_unused,
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struct perf_evlist *evlist __maybe_unused,
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int idx __maybe_unused,
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bool per_cpu __maybe_unused)
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{
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}
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#ifdef HAVE_AIO_SUPPORT
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static int perf_mmap__aio_enabled(struct perf_mmap *map)
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{
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return map->aio.nr_cblocks > 0;
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}
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#ifdef HAVE_LIBNUMA_SUPPORT
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static int perf_mmap__aio_alloc(struct perf_mmap *map, int idx)
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{
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map->aio.data[idx] = mmap(NULL, perf_mmap__mmap_len(map), PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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if (map->aio.data[idx] == MAP_FAILED) {
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map->aio.data[idx] = 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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static void perf_mmap__aio_free(struct perf_mmap *map, int idx)
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{
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if (map->aio.data[idx]) {
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munmap(map->aio.data[idx], perf_mmap__mmap_len(map));
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map->aio.data[idx] = NULL;
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}
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}
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static int perf_mmap__aio_bind(struct perf_mmap *map, int idx, int cpu, int affinity)
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{
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void *data;
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size_t mmap_len;
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unsigned long node_mask;
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if (affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) {
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data = map->aio.data[idx];
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mmap_len = perf_mmap__mmap_len(map);
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node_mask = 1UL << cpu__get_node(cpu);
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if (mbind(data, mmap_len, MPOL_BIND, &node_mask, 1, 0)) {
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pr_err("Failed to bind [%p-%p] AIO buffer to node %d: error %m\n",
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data, data + mmap_len, cpu__get_node(cpu));
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return -1;
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}
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}
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return 0;
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}
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#else /* !HAVE_LIBNUMA_SUPPORT */
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static int perf_mmap__aio_alloc(struct perf_mmap *map, int idx)
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{
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map->aio.data[idx] = malloc(perf_mmap__mmap_len(map));
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if (map->aio.data[idx] == NULL)
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return -1;
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return 0;
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}
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static void perf_mmap__aio_free(struct perf_mmap *map, int idx)
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{
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zfree(&(map->aio.data[idx]));
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}
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static int perf_mmap__aio_bind(struct perf_mmap *map __maybe_unused, int idx __maybe_unused,
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int cpu __maybe_unused, int affinity __maybe_unused)
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{
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return 0;
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}
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#endif
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static int perf_mmap__aio_mmap(struct perf_mmap *map, struct mmap_params *mp)
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{
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int delta_max, i, prio, ret;
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map->aio.nr_cblocks = mp->nr_cblocks;
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if (map->aio.nr_cblocks) {
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map->aio.aiocb = calloc(map->aio.nr_cblocks, sizeof(struct aiocb *));
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if (!map->aio.aiocb) {
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pr_debug2("failed to allocate aiocb for data buffer, error %m\n");
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return -1;
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}
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map->aio.cblocks = calloc(map->aio.nr_cblocks, sizeof(struct aiocb));
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if (!map->aio.cblocks) {
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pr_debug2("failed to allocate cblocks for data buffer, error %m\n");
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return -1;
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}
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map->aio.data = calloc(map->aio.nr_cblocks, sizeof(void *));
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if (!map->aio.data) {
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pr_debug2("failed to allocate data buffer, error %m\n");
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return -1;
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}
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delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX);
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for (i = 0; i < map->aio.nr_cblocks; ++i) {
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ret = perf_mmap__aio_alloc(map, i);
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if (ret == -1) {
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pr_debug2("failed to allocate data buffer area, error %m");
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return -1;
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}
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ret = perf_mmap__aio_bind(map, i, map->cpu, mp->affinity);
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if (ret == -1)
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return -1;
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/*
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* Use cblock.aio_fildes value different from -1
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* to denote started aio write operation on the
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* cblock so it requires explicit record__aio_sync()
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* call prior the cblock may be reused again.
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*/
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map->aio.cblocks[i].aio_fildes = -1;
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/*
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* Allocate cblocks with priority delta to have
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* faster aio write system calls because queued requests
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* are kept in separate per-prio queues and adding
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* a new request will iterate thru shorter per-prio
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* list. Blocks with numbers higher than
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* _SC_AIO_PRIO_DELTA_MAX go with priority 0.
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*/
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prio = delta_max - i;
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map->aio.cblocks[i].aio_reqprio = prio >= 0 ? prio : 0;
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}
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}
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return 0;
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}
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static void perf_mmap__aio_munmap(struct perf_mmap *map)
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{
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int i;
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for (i = 0; i < map->aio.nr_cblocks; ++i)
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perf_mmap__aio_free(map, i);
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if (map->aio.data)
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zfree(&map->aio.data);
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zfree(&map->aio.cblocks);
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zfree(&map->aio.aiocb);
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}
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#else /* !HAVE_AIO_SUPPORT */
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static int perf_mmap__aio_enabled(struct perf_mmap *map __maybe_unused)
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{
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return 0;
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}
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static int perf_mmap__aio_mmap(struct perf_mmap *map __maybe_unused,
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struct mmap_params *mp __maybe_unused)
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{
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return 0;
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}
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static void perf_mmap__aio_munmap(struct perf_mmap *map __maybe_unused)
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{
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}
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#endif
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void perf_mmap__munmap(struct perf_mmap *map)
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{
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perf_mmap__aio_munmap(map);
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if (map->data != NULL) {
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munmap(map->data, perf_mmap__mmap_len(map));
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map->data = NULL;
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}
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if (map->base != NULL) {
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munmap(map->base, perf_mmap__mmap_len(map));
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map->base = NULL;
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map->fd = -1;
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refcount_set(&map->refcnt, 0);
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}
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auxtrace_mmap__munmap(&map->auxtrace_mmap);
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}
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static void build_node_mask(int node, cpu_set_t *mask)
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{
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int c, cpu, nr_cpus;
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const struct cpu_map *cpu_map = NULL;
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cpu_map = cpu_map__online();
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if (!cpu_map)
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return;
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nr_cpus = cpu_map__nr(cpu_map);
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for (c = 0; c < nr_cpus; c++) {
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cpu = cpu_map->map[c]; /* map c index to online cpu index */
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if (cpu__get_node(cpu) == node)
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CPU_SET(cpu, mask);
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}
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}
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static void perf_mmap__setup_affinity_mask(struct perf_mmap *map, struct mmap_params *mp)
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{
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CPU_ZERO(&map->affinity_mask);
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if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1)
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build_node_mask(cpu__get_node(map->cpu), &map->affinity_mask);
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else if (mp->affinity == PERF_AFFINITY_CPU)
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CPU_SET(map->cpu, &map->affinity_mask);
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}
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int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd, int cpu)
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{
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/*
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* The last one will be done at perf_mmap__consume(), so that we
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* make sure we don't prevent tools from consuming every last event in
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* the ring buffer.
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*
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* I.e. we can get the POLLHUP meaning that the fd doesn't exist
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* anymore, but the last events for it are still in the ring buffer,
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* waiting to be consumed.
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*
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* Tools can chose to ignore this at their own discretion, but the
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* evlist layer can't just drop it when filtering events in
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* perf_evlist__filter_pollfd().
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*/
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refcount_set(&map->refcnt, 2);
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map->prev = 0;
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map->mask = mp->mask;
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map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
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MAP_SHARED, fd, 0);
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if (map->base == MAP_FAILED) {
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pr_debug2("failed to mmap perf event ring buffer, error %d\n",
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errno);
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map->base = NULL;
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return -1;
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}
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map->fd = fd;
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map->cpu = cpu;
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perf_mmap__setup_affinity_mask(map, mp);
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map->flush = mp->flush;
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map->comp_level = mp->comp_level;
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if (map->comp_level && !perf_mmap__aio_enabled(map)) {
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map->data = mmap(NULL, perf_mmap__mmap_len(map), PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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if (map->data == MAP_FAILED) {
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pr_debug2("failed to mmap data buffer, error %d\n",
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errno);
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map->data = NULL;
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return -1;
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}
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}
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if (auxtrace_mmap__mmap(&map->auxtrace_mmap,
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&mp->auxtrace_mp, map->base, fd))
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return -1;
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return perf_mmap__aio_mmap(map, mp);
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}
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static int overwrite_rb_find_range(void *buf, int mask, u64 *start, u64 *end)
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{
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struct perf_event_header *pheader;
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u64 evt_head = *start;
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int size = mask + 1;
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pr_debug2("%s: buf=%p, start=%"PRIx64"\n", __func__, buf, *start);
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pheader = (struct perf_event_header *)(buf + (*start & mask));
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while (true) {
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if (evt_head - *start >= (unsigned int)size) {
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pr_debug("Finished reading overwrite ring buffer: rewind\n");
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if (evt_head - *start > (unsigned int)size)
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evt_head -= pheader->size;
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*end = evt_head;
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return 0;
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}
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pheader = (struct perf_event_header *)(buf + (evt_head & mask));
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if (pheader->size == 0) {
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pr_debug("Finished reading overwrite ring buffer: get start\n");
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*end = evt_head;
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return 0;
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}
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evt_head += pheader->size;
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pr_debug3("move evt_head: %"PRIx64"\n", evt_head);
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}
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WARN_ONCE(1, "Shouldn't get here\n");
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return -1;
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}
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/*
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* Report the start and end of the available data in ringbuffer
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*/
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static int __perf_mmap__read_init(struct perf_mmap *md)
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{
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u64 head = perf_mmap__read_head(md);
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u64 old = md->prev;
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unsigned char *data = md->base + page_size;
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unsigned long size;
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md->start = md->overwrite ? head : old;
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md->end = md->overwrite ? old : head;
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if ((md->end - md->start) < md->flush)
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return -EAGAIN;
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size = md->end - md->start;
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if (size > (unsigned long)(md->mask) + 1) {
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if (!md->overwrite) {
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WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
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md->prev = head;
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perf_mmap__consume(md);
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return -EAGAIN;
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}
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/*
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* Backward ring buffer is full. We still have a chance to read
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* most of data from it.
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*/
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if (overwrite_rb_find_range(data, md->mask, &md->start, &md->end))
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return -EINVAL;
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}
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return 0;
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}
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int perf_mmap__read_init(struct perf_mmap *map)
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{
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/*
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* Check if event was unmapped due to a POLLHUP/POLLERR.
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*/
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if (!refcount_read(&map->refcnt))
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return -ENOENT;
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return __perf_mmap__read_init(map);
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}
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int perf_mmap__push(struct perf_mmap *md, void *to,
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int push(struct perf_mmap *map, void *to, void *buf, size_t size))
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{
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u64 head = perf_mmap__read_head(md);
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unsigned char *data = md->base + page_size;
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unsigned long size;
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void *buf;
|
|
int rc = 0;
|
|
|
|
rc = perf_mmap__read_init(md);
|
|
if (rc < 0)
|
|
return (rc == -EAGAIN) ? 1 : -1;
|
|
|
|
size = md->end - md->start;
|
|
|
|
if ((md->start & md->mask) + size != (md->end & md->mask)) {
|
|
buf = &data[md->start & md->mask];
|
|
size = md->mask + 1 - (md->start & md->mask);
|
|
md->start += size;
|
|
|
|
if (push(md, to, buf, size) < 0) {
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
buf = &data[md->start & md->mask];
|
|
size = md->end - md->start;
|
|
md->start += size;
|
|
|
|
if (push(md, to, buf, size) < 0) {
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
|
|
md->prev = head;
|
|
perf_mmap__consume(md);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Mandatory for overwrite mode
|
|
* The direction of overwrite mode is backward.
|
|
* The last perf_mmap__read() will set tail to map->prev.
|
|
* Need to correct the map->prev to head which is the end of next read.
|
|
*/
|
|
void perf_mmap__read_done(struct perf_mmap *map)
|
|
{
|
|
/*
|
|
* Check if event was unmapped due to a POLLHUP/POLLERR.
|
|
*/
|
|
if (!refcount_read(&map->refcnt))
|
|
return;
|
|
|
|
map->prev = perf_mmap__read_head(map);
|
|
}
|