^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2013-2015, Michael Ellerman, IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #define _GNU_SOURCE /* For CPU_ZERO etc. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <link.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sys/sysinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <sys/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "utils.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static char auxv[4096];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) int read_auxv(char *buf, ssize_t buf_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) ssize_t num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int rc, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) fd = open("/proc/self/auxv", O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) perror("open");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) num = read(fd, buf, buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (num < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) perror("read");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (num > buf_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) printf("overflowed auxv buffer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) rc = -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) void *find_auxv_entry(int type, char *auxv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ElfW(auxv_t) *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) p = (ElfW(auxv_t) *)auxv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) while (p->a_type != AT_NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (p->a_type == type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) void *get_auxv_entry(int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) ElfW(auxv_t) *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (read_auxv(auxv, sizeof(auxv)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) p = find_auxv_entry(type, auxv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return (void *)p->a_un.a_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int pick_online_cpu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int ncpus, cpu = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) cpu_set_t *mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ncpus = get_nprocs_conf();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) size = CPU_ALLOC_SIZE(ncpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mask = CPU_ALLOC(ncpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) CPU_ZERO_S(size, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (sched_getaffinity(0, size, mask)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) perror("sched_getaffinity");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* We prefer a primary thread, but skip 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) for (cpu = 8; cpu < ncpus; cpu += 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (CPU_ISSET_S(cpu, size, mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* Search for anything, but in reverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) for (cpu = ncpus - 1; cpu >= 0; cpu--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (CPU_ISSET_S(cpu, size, mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) printf("No cpus in affinity mask?!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) CPU_FREE(mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) bool is_ppc64le(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct utsname uts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) errno = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) rc = uname(&uts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) perror("uname");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return strcmp(uts.machine, "ppc64le") == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int read_sysfs_file(char *fpath, char *result, size_t result_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) char path[PATH_MAX] = "/sys/";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int rc = -1, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) strncat(path, fpath, PATH_MAX - strlen(path) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if ((fd = open(path, O_RDONLY)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) rc = read(fd, result, result_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int read_debugfs_file(char *debugfs_file, int *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int rc = -1, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) char value[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) strcpy(path, "/sys/kernel/debug/");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) strncat(path, debugfs_file, PATH_MAX - strlen(path) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if ((fd = open(path, O_RDONLY)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if ((rc = read(fd, value, sizeof(value))) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) value[15] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) *result = atoi(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int write_debugfs_file(char *debugfs_file, int result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int rc = -1, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) char value[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) strcpy(path, "/sys/kernel/debug/");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) strncat(path, debugfs_file, PATH_MAX - strlen(path) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if ((fd = open(path, O_WRONLY)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) snprintf(value, 16, "%d", result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if ((rc = write(fd, value, strlen(value))) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) int cpu, int group_fd, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return syscall(__NR_perf_event_open, hw_event, pid, cpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) group_fd, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static void perf_event_attr_init(struct perf_event_attr *event_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) unsigned long config)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) memset(event_attr, 0, sizeof(*event_attr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) event_attr->type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) event_attr->size = sizeof(struct perf_event_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) event_attr->config = config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) event_attr->read_format = PERF_FORMAT_GROUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) event_attr->disabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) event_attr->exclude_kernel = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) event_attr->exclude_hv = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) event_attr->exclude_guest = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) int perf_event_open_counter(unsigned int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) unsigned long config, int group_fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct perf_event_attr event_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) perf_event_attr_init(&event_attr, type, config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) fd = perf_event_open(&event_attr, 0, -1, group_fd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) perror("perf_event_open() failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) int perf_event_enable(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (ioctl(fd, PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) perror("error while enabling perf events");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) int perf_event_disable(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (ioctl(fd, PERF_EVENT_IOC_DISABLE, PERF_IOC_FLAG_GROUP) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) perror("error disabling perf events");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int perf_event_reset(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (ioctl(fd, PERF_EVENT_IOC_RESET, PERF_IOC_FLAG_GROUP) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) perror("error resetting perf events");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) int using_hash_mmu(bool *using_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) char line[128];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) FILE *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) f = fopen("/proc/cpuinfo", "r");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) FAIL_IF(!f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) while (fgets(line, sizeof(line), f) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (!strcmp(line, "MMU : Hash\n") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) !strcmp(line, "platform : Cell\n") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) !strcmp(line, "platform : PowerMac\n")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) *using_hash = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (strcmp(line, "MMU : Radix\n") == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) *using_hash = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) rc = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) fclose(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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