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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/powerpc/utils.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/utils.c')
-rw-r--r-- | tools/testing/selftests/powerpc/utils.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/utils.c b/tools/testing/selftests/powerpc/utils.c new file mode 100644 index 000000000..1f36ee1a9 --- /dev/null +++ b/tools/testing/selftests/powerpc/utils.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2013-2015, Michael Ellerman, IBM Corp. + */ + +#define _GNU_SOURCE /* For CPU_ZERO etc. */ + +#include <elf.h> +#include <errno.h> +#include <fcntl.h> +#include <link.h> +#include <sched.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/sysinfo.h> +#include <sys/types.h> +#include <sys/utsname.h> +#include <unistd.h> +#include <asm/unistd.h> +#include <linux/limits.h> + +#include "utils.h" + +static char auxv[4096]; + +int read_auxv(char *buf, ssize_t buf_size) +{ + ssize_t num; + int rc, fd; + + fd = open("/proc/self/auxv", O_RDONLY); + if (fd == -1) { + perror("open"); + return -errno; + } + + num = read(fd, buf, buf_size); + if (num < 0) { + perror("read"); + rc = -EIO; + goto out; + } + + if (num > buf_size) { + printf("overflowed auxv buffer\n"); + rc = -EOVERFLOW; + goto out; + } + + rc = 0; +out: + close(fd); + return rc; +} + +void *find_auxv_entry(int type, char *auxv) +{ + ElfW(auxv_t) *p; + + p = (ElfW(auxv_t) *)auxv; + + while (p->a_type != AT_NULL) { + if (p->a_type == type) + return p; + + p++; + } + + return NULL; +} + +void *get_auxv_entry(int type) +{ + ElfW(auxv_t) *p; + + if (read_auxv(auxv, sizeof(auxv))) + return NULL; + + p = find_auxv_entry(type, auxv); + if (p) + return (void *)p->a_un.a_val; + + return NULL; +} + +int pick_online_cpu(void) +{ + int ncpus, cpu = -1; + cpu_set_t *mask; + size_t size; + + ncpus = get_nprocs_conf(); + size = CPU_ALLOC_SIZE(ncpus); + mask = CPU_ALLOC(ncpus); + if (!mask) { + perror("malloc"); + return -1; + } + + CPU_ZERO_S(size, mask); + + if (sched_getaffinity(0, size, mask)) { + perror("sched_getaffinity"); + goto done; + } + + /* We prefer a primary thread, but skip 0 */ + for (cpu = 8; cpu < ncpus; cpu += 8) + if (CPU_ISSET_S(cpu, size, mask)) + goto done; + + /* Search for anything, but in reverse */ + for (cpu = ncpus - 1; cpu >= 0; cpu--) + if (CPU_ISSET_S(cpu, size, mask)) + goto done; + + printf("No cpus in affinity mask?!\n"); + +done: + CPU_FREE(mask); + return cpu; +} + +bool is_ppc64le(void) +{ + struct utsname uts; + int rc; + + errno = 0; + rc = uname(&uts); + if (rc) { + perror("uname"); + return false; + } + + return strcmp(uts.machine, "ppc64le") == 0; +} + +int read_sysfs_file(char *fpath, char *result, size_t result_size) +{ + char path[PATH_MAX] = "/sys/"; + int rc = -1, fd; + + strncat(path, fpath, PATH_MAX - strlen(path) - 1); + + if ((fd = open(path, O_RDONLY)) < 0) + return rc; + + rc = read(fd, result, result_size); + + close(fd); + + if (rc < 0) + return rc; + + return 0; +} + +int read_debugfs_file(char *debugfs_file, int *result) +{ + int rc = -1, fd; + char path[PATH_MAX]; + char value[16]; + + strcpy(path, "/sys/kernel/debug/"); + strncat(path, debugfs_file, PATH_MAX - strlen(path) - 1); + + if ((fd = open(path, O_RDONLY)) < 0) + return rc; + + if ((rc = read(fd, value, sizeof(value))) < 0) + return rc; + + value[15] = 0; + *result = atoi(value); + close(fd); + + return 0; +} + +int write_debugfs_file(char *debugfs_file, int result) +{ + int rc = -1, fd; + char path[PATH_MAX]; + char value[16]; + + strcpy(path, "/sys/kernel/debug/"); + strncat(path, debugfs_file, PATH_MAX - strlen(path) - 1); + + if ((fd = open(path, O_WRONLY)) < 0) + return rc; + + snprintf(value, 16, "%d", result); + + if ((rc = write(fd, value, strlen(value))) < 0) + return rc; + + close(fd); + + return 0; +} + +static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, + int cpu, int group_fd, unsigned long flags) +{ + return syscall(__NR_perf_event_open, hw_event, pid, cpu, + group_fd, flags); +} + +static void perf_event_attr_init(struct perf_event_attr *event_attr, + unsigned int type, + unsigned long config) +{ + memset(event_attr, 0, sizeof(*event_attr)); + + event_attr->type = type; + event_attr->size = sizeof(struct perf_event_attr); + event_attr->config = config; + event_attr->read_format = PERF_FORMAT_GROUP; + event_attr->disabled = 1; + event_attr->exclude_kernel = 1; + event_attr->exclude_hv = 1; + event_attr->exclude_guest = 1; +} + +int perf_event_open_counter(unsigned int type, + unsigned long config, int group_fd) +{ + int fd; + struct perf_event_attr event_attr; + + perf_event_attr_init(&event_attr, type, config); + + fd = perf_event_open(&event_attr, 0, -1, group_fd, 0); + + if (fd < 0) + perror("perf_event_open() failed"); + + return fd; +} + +int perf_event_enable(int fd) +{ + if (ioctl(fd, PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP) == -1) { + perror("error while enabling perf events"); + return -1; + } + + return 0; +} + +int perf_event_disable(int fd) +{ + if (ioctl(fd, PERF_EVENT_IOC_DISABLE, PERF_IOC_FLAG_GROUP) == -1) { + perror("error disabling perf events"); + return -1; + } + + return 0; +} + +int perf_event_reset(int fd) +{ + if (ioctl(fd, PERF_EVENT_IOC_RESET, PERF_IOC_FLAG_GROUP) == -1) { + perror("error resetting perf events"); + return -1; + } + + return 0; +} + +int using_hash_mmu(bool *using_hash) +{ + char line[128]; + FILE *f; + int rc; + + f = fopen("/proc/cpuinfo", "r"); + FAIL_IF(!f); + + rc = 0; + while (fgets(line, sizeof(line), f) != NULL) { + if (!strcmp(line, "MMU : Hash\n") || + !strcmp(line, "platform : Cell\n") || + !strcmp(line, "platform : PowerMac\n")) { + *using_hash = true; + goto out; + } + + if (strcmp(line, "MMU : Radix\n") == 0) { + *using_hash = false; + goto out; + } + } + + rc = -1; +out: + fclose(f); + return rc; +} |