Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further
 * copyright notes.
 */
 
#include <sys/mman.h>
#include <inttypes.h>
#include <asm/bug.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h> // sysconf()
#include <perf/mmap.h>
#ifdef HAVE_LIBNUMA_SUPPORT
#include <numaif.h>
#endif
#include "cpumap.h"
#include "debug.h"
#include "event.h"
#include "mmap.h"
#include "../perf.h"
#include <internal/lib.h> /* page_size */
#include <linux/bitmap.h>
 
#define MASK_SIZE 1023
void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag)
{
<------>char buf[MASK_SIZE + 1];
<------>size_t len;
 
<------>len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE);
<------>buf[len] = '\0';
<------>pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf);
}
 
size_t mmap__mmap_len(struct mmap *map)
{
<------>return perf_mmap__mmap_len(&map->core);
}
 
int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
<------><------><------>       struct auxtrace_mmap_params *mp __maybe_unused,
<------><------><------>       void *userpg __maybe_unused,
<------><------><------>       int fd __maybe_unused)
{
<------>return 0;
}
 
void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)
{
}
 
void __weak auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp __maybe_unused,
<------><------><------><------>       off_t auxtrace_offset __maybe_unused,
<------><------><------><------>       unsigned int auxtrace_pages __maybe_unused,
<------><------><------><------>       bool auxtrace_overwrite __maybe_unused)
{
}
 
void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __maybe_unused,
<------><------><------><------><------>  struct evlist *evlist __maybe_unused,
<------><------><------><------><------>  int idx __maybe_unused,
<------><------><------><------><------>  bool per_cpu __maybe_unused)
{
}
 
#ifdef HAVE_AIO_SUPPORT
static int perf_mmap__aio_enabled(struct mmap *map)
{
<------>return map->aio.nr_cblocks > 0;
}
 
#ifdef HAVE_LIBNUMA_SUPPORT
static int perf_mmap__aio_alloc(struct mmap *map, int idx)
{
<------>map->aio.data[idx] = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,
<------><------><------><------>  MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
<------>if (map->aio.data[idx] == MAP_FAILED) {
<------><------>map->aio.data[idx] = NULL;
<------><------>return -1;
<------>}
 
<------>return 0;
}
 
static void perf_mmap__aio_free(struct mmap *map, int idx)
{
<------>if (map->aio.data[idx]) {
<------><------>munmap(map->aio.data[idx], mmap__mmap_len(map));
<------><------>map->aio.data[idx] = NULL;
<------>}
}
 
static int perf_mmap__aio_bind(struct mmap *map, int idx, int cpu, int affinity)
{
<------>void *data;
<------>size_t mmap_len;
<------>unsigned long *node_mask;
<------>unsigned long node_index;
<------>int err = 0;
 
<------>if (affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) {
<------><------>data = map->aio.data[idx];
<------><------>mmap_len = mmap__mmap_len(map);
<------><------>node_index = cpu__get_node(cpu);
<------><------>node_mask = bitmap_alloc(node_index + 1);
<------><------>if (!node_mask) {
<------><------><------>pr_err("Failed to allocate node mask for mbind: error %m\n");
<------><------><------>return -1;
<------><------>}
<------><------>set_bit(node_index, node_mask);
<------><------>if (mbind(data, mmap_len, MPOL_BIND, node_mask, node_index + 1 + 1, 0)) {
<------><------><------>pr_err("Failed to bind [%p-%p] AIO buffer to node %lu: error %m\n",
<------><------><------><------>data, data + mmap_len, node_index);
<------><------><------>err = -1;
<------><------>}
<------><------>bitmap_free(node_mask);
<------>}
 
<------>return err;
}
#else /* !HAVE_LIBNUMA_SUPPORT */
static int perf_mmap__aio_alloc(struct mmap *map, int idx)
{
<------>map->aio.data[idx] = malloc(mmap__mmap_len(map));
<------>if (map->aio.data[idx] == NULL)
<------><------>return -1;
 
<------>return 0;
}
 
static void perf_mmap__aio_free(struct mmap *map, int idx)
{
<------>zfree(&(map->aio.data[idx]));
}
 
static int perf_mmap__aio_bind(struct mmap *map __maybe_unused, int idx __maybe_unused,
<------><------>int cpu __maybe_unused, int affinity __maybe_unused)
{
<------>return 0;
}
#endif
 
static int perf_mmap__aio_mmap(struct mmap *map, struct mmap_params *mp)
{
<------>int delta_max, i, prio, ret;
 
<------>map->aio.nr_cblocks = mp->nr_cblocks;
<------>if (map->aio.nr_cblocks) {
<------><------>map->aio.aiocb = calloc(map->aio.nr_cblocks, sizeof(struct aiocb *));
<------><------>if (!map->aio.aiocb) {
<------><------><------>pr_debug2("failed to allocate aiocb for data buffer, error %m\n");
<------><------><------>return -1;
<------><------>}
<------><------>map->aio.cblocks = calloc(map->aio.nr_cblocks, sizeof(struct aiocb));
<------><------>if (!map->aio.cblocks) {
<------><------><------>pr_debug2("failed to allocate cblocks for data buffer, error %m\n");
<------><------><------>return -1;
<------><------>}
<------><------>map->aio.data = calloc(map->aio.nr_cblocks, sizeof(void *));
<------><------>if (!map->aio.data) {
<------><------><------>pr_debug2("failed to allocate data buffer, error %m\n");
<------><------><------>return -1;
<------><------>}
<------><------>delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX);
<------><------>for (i = 0; i < map->aio.nr_cblocks; ++i) {
<------><------><------>ret = perf_mmap__aio_alloc(map, i);
<------><------><------>if (ret == -1) {
<------><------><------><------>pr_debug2("failed to allocate data buffer area, error %m");
<------><------><------><------>return -1;
<------><------><------>}
<------><------><------>ret = perf_mmap__aio_bind(map, i, map->core.cpu, mp->affinity);
<------><------><------>if (ret == -1)
<------><------><------><------>return -1;
<------><------><------>/*
<------><------><------> * Use cblock.aio_fildes value different from -1
<------><------><------> * to denote started aio write operation on the
<------><------><------> * cblock so it requires explicit record__aio_sync()
<------><------><------> * call prior the cblock may be reused again.
<------><------><------> */
<------><------><------>map->aio.cblocks[i].aio_fildes = -1;
<------><------><------>/*
<------><------><------> * Allocate cblocks with priority delta to have
<------><------><------> * faster aio write system calls because queued requests
<------><------><------> * are kept in separate per-prio queues and adding
<------><------><------> * a new request will iterate thru shorter per-prio
<------><------><------> * list. Blocks with numbers higher than
<------><------><------> *  _SC_AIO_PRIO_DELTA_MAX go with priority 0.
<------><------><------> */
<------><------><------>prio = delta_max - i;
<------><------><------>map->aio.cblocks[i].aio_reqprio = prio >= 0 ? prio : 0;
<------><------>}
<------>}
 
<------>return 0;
}
 
static void perf_mmap__aio_munmap(struct mmap *map)
{
<------>int i;
 
<------>for (i = 0; i < map->aio.nr_cblocks; ++i)
<------><------>perf_mmap__aio_free(map, i);
<------>if (map->aio.data)
<------><------>zfree(&map->aio.data);
<------>zfree(&map->aio.cblocks);
<------>zfree(&map->aio.aiocb);
}
#else /* !HAVE_AIO_SUPPORT */
static int perf_mmap__aio_enabled(struct mmap *map __maybe_unused)
{
<------>return 0;
}
 
static int perf_mmap__aio_mmap(struct mmap *map __maybe_unused,
<------><------><------>       struct mmap_params *mp __maybe_unused)
{
<------>return 0;
}
 
static void perf_mmap__aio_munmap(struct mmap *map __maybe_unused)
{
}
#endif
 
void mmap__munmap(struct mmap *map)
{
<------>bitmap_free(map->affinity_mask.bits);
 
<------>perf_mmap__aio_munmap(map);
<------>if (map->data != NULL) {
<------><------>munmap(map->data, mmap__mmap_len(map));
<------><------>map->data = NULL;
<------>}
<------>auxtrace_mmap__munmap(&map->auxtrace_mmap);
}
 
static void build_node_mask(int node, struct mmap_cpu_mask *mask)
{
<------>int c, cpu, nr_cpus;
<------>const struct perf_cpu_map *cpu_map = NULL;
 
<------>cpu_map = cpu_map__online();
<------>if (!cpu_map)
<------><------>return;
 
<------>nr_cpus = perf_cpu_map__nr(cpu_map);
<------>for (c = 0; c < nr_cpus; c++) {
<------><------>cpu = cpu_map->map[c]; /* map c index to online cpu index */
<------><------>if (cpu__get_node(cpu) == node)
<------><------><------>set_bit(cpu, mask->bits);
<------>}
}
 
static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp)
{
<------>map->affinity_mask.nbits = cpu__max_cpu();
<------>map->affinity_mask.bits = bitmap_alloc(map->affinity_mask.nbits);
<------>if (!map->affinity_mask.bits)
<------><------>return -1;
 
<------>if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1)
<------><------>build_node_mask(cpu__get_node(map->core.cpu), &map->affinity_mask);
<------>else if (mp->affinity == PERF_AFFINITY_CPU)
<------><------>set_bit(map->core.cpu, map->affinity_mask.bits);
 
<------>return 0;
}
 
int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
{
<------>if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) {
<------><------>pr_debug2("failed to mmap perf event ring buffer, error %d\n",
<------><------><------>  errno);
<------><------>return -1;
<------>}
 
<------>if (mp->affinity != PERF_AFFINITY_SYS &&
<------><------>perf_mmap__setup_affinity_mask(map, mp)) {
<------><------>pr_debug2("failed to alloc mmap affinity mask, error %d\n",
<------><------><------>  errno);
<------><------>return -1;
<------>}
 
<------>if (verbose == 2)
<------><------>mmap_cpu_mask__scnprintf(&map->affinity_mask, "mmap");
 
<------>map->core.flush = mp->flush;
 
<------>map->comp_level = mp->comp_level;
 
<------>if (map->comp_level && !perf_mmap__aio_enabled(map)) {
<------><------>map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,
<------><------><------><------> MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
<------><------>if (map->data == MAP_FAILED) {
<------><------><------>pr_debug2("failed to mmap data buffer, error %d\n",
<------><------><------><------><------>errno);
<------><------><------>map->data = NULL;
<------><------><------>return -1;
<------><------>}
<------>}
 
<------>if (auxtrace_mmap__mmap(&map->auxtrace_mmap,
<------><------><------><------>&mp->auxtrace_mp, map->core.base, fd))
<------><------>return -1;
 
<------>return perf_mmap__aio_mmap(map, mp);
}
 
int perf_mmap__push(struct mmap *md, void *to,
<------><------>    int push(struct mmap *map, void *to, void *buf, size_t size))
{
<------>u64 head = perf_mmap__read_head(&md->core);
<------>unsigned char *data = md->core.base + page_size;
<------>unsigned long size;
<------>void *buf;
<------>int rc = 0;
 
<------>rc = perf_mmap__read_init(&md->core);
<------>if (rc < 0)
<------><------>return (rc == -EAGAIN) ? 1 : -1;
 
<------>size = md->core.end - md->core.start;
 
<------>if ((md->core.start & md->core.mask) + size != (md->core.end & md->core.mask)) {
<------><------>buf = &data[md->core.start & md->core.mask];
<------><------>size = md->core.mask + 1 - (md->core.start & md->core.mask);
<------><------>md->core.start += size;
 
<------><------>if (push(md, to, buf, size) < 0) {
<------><------><------>rc = -1;
<------><------><------>goto out;
<------><------>}
<------>}
 
<------>buf = &data[md->core.start & md->core.mask];
<------>size = md->core.end - md->core.start;
<------>md->core.start += size;
 
<------>if (push(md, to, buf, size) < 0) {
<------><------>rc = -1;
<------><------>goto out;
<------>}
 
<------>md->core.prev = head;
<------>perf_mmap__consume(&md->core);
out:
<------>return rc;
}