diff options
Diffstat (limited to 'powerpc/pmu/lib.c')
| -rw-r--r-- | powerpc/pmu/lib.c | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/powerpc/pmu/lib.c b/powerpc/pmu/lib.c deleted file mode 100644 index 9768dea..0000000 --- a/powerpc/pmu/lib.c +++ /dev/null @@ -1,300 +0,0 @@ -/* - * Copyright 2014, Michael Ellerman, IBM Corp. - * Licensed under GPLv2. - */ - -#define _GNU_SOURCE /* For CPU_ZERO etc. */ - -#include <elf.h> -#include <errno.h> -#include <fcntl.h> -#include <link.h> -#include <sched.h> -#include <setjmp.h> -#include <stdlib.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/wait.h> - -#include "utils.h" -#include "lib.h" - - -int pick_online_cpu(void) -{ - cpu_set_t mask; - int cpu; - - CPU_ZERO(&mask); - - if (sched_getaffinity(0, sizeof(mask), &mask)) { - perror("sched_getaffinity"); - return -1; - } - - /* We prefer a primary thread, but skip 0 */ - for (cpu = 8; cpu < CPU_SETSIZE; cpu += 8) - if (CPU_ISSET(cpu, &mask)) - return cpu; - - /* Search for anything, but in reverse */ - for (cpu = CPU_SETSIZE - 1; cpu >= 0; cpu--) - if (CPU_ISSET(cpu, &mask)) - return cpu; - - printf("No cpus in affinity mask?!\n"); - return -1; -} - -int bind_to_cpu(int cpu) -{ - cpu_set_t mask; - - printf("Binding to cpu %d\n", cpu); - - CPU_ZERO(&mask); - CPU_SET(cpu, &mask); - - return sched_setaffinity(0, sizeof(mask), &mask); -} - -#define PARENT_TOKEN 0xAA -#define CHILD_TOKEN 0x55 - -int sync_with_child(union pipe read_pipe, union pipe write_pipe) -{ - char c = PARENT_TOKEN; - - FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1); - FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1); - if (c != CHILD_TOKEN) /* sometimes expected */ - return 1; - - return 0; -} - -int wait_for_parent(union pipe read_pipe) -{ - char c; - - FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1); - FAIL_IF(c != PARENT_TOKEN); - - return 0; -} - -int notify_parent(union pipe write_pipe) -{ - char c = CHILD_TOKEN; - - FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1); - - return 0; -} - -int notify_parent_of_error(union pipe write_pipe) -{ - char c = ~CHILD_TOKEN; - - FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1); - - return 0; -} - -int wait_for_child(pid_t child_pid) -{ - int rc; - - if (waitpid(child_pid, &rc, 0) == -1) { - perror("waitpid"); - return 1; - } - - if (WIFEXITED(rc)) - rc = WEXITSTATUS(rc); - else - rc = 1; /* Signal or other */ - - return rc; -} - -int kill_child_and_wait(pid_t child_pid) -{ - kill(child_pid, SIGTERM); - - return wait_for_child(child_pid); -} - -static int eat_cpu_child(union pipe read_pipe, union pipe write_pipe) -{ - volatile int i = 0; - - /* - * We are just here to eat cpu and die. So make sure we can be killed, - * and also don't do any custom SIGTERM handling. - */ - signal(SIGTERM, SIG_DFL); - - notify_parent(write_pipe); - wait_for_parent(read_pipe); - - /* Soak up cpu forever */ - while (1) i++; - - return 0; -} - -pid_t eat_cpu(int (test_function)(void)) -{ - union pipe read_pipe, write_pipe; - int cpu, rc; - pid_t pid; - - cpu = pick_online_cpu(); - FAIL_IF(cpu < 0); - FAIL_IF(bind_to_cpu(cpu)); - - if (pipe(read_pipe.fds) == -1) - return -1; - - if (pipe(write_pipe.fds) == -1) - return -1; - - pid = fork(); - if (pid == 0) - exit(eat_cpu_child(write_pipe, read_pipe)); - - if (sync_with_child(read_pipe, write_pipe)) { - rc = -1; - goto out; - } - - printf("main test running as pid %d\n", getpid()); - - rc = test_function(); -out: - kill(pid, SIGKILL); - - return rc; -} - -struct addr_range libc, vdso; - -int parse_proc_maps(void) -{ - unsigned long start, end; - char execute, name[128]; - FILE *f; - int rc; - - f = fopen("/proc/self/maps", "r"); - if (!f) { - perror("fopen"); - return -1; - } - - do { - /* This skips line with no executable which is what we want */ - rc = fscanf(f, "%lx-%lx %*c%*c%c%*c %*x %*d:%*d %*d %127s\n", - &start, &end, &execute, name); - if (rc <= 0) - break; - - if (execute != 'x') - continue; - - if (strstr(name, "libc")) { - libc.first = start; - libc.last = end - 1; - } else if (strstr(name, "[vdso]")) { - vdso.first = start; - vdso.last = end - 1; - } - } while(1); - - fclose(f); - - return 0; -} - -#define PARANOID_PATH "/proc/sys/kernel/perf_event_paranoid" - -bool require_paranoia_below(int level) -{ - unsigned long current; - char *end, buf[16]; - FILE *f; - int rc; - - rc = -1; - - f = fopen(PARANOID_PATH, "r"); - if (!f) { - perror("fopen"); - goto out; - } - - if (!fgets(buf, sizeof(buf), f)) { - printf("Couldn't read " PARANOID_PATH "?\n"); - goto out_close; - } - - current = strtoul(buf, &end, 10); - - if (end == buf) { - printf("Couldn't parse " PARANOID_PATH "?\n"); - goto out_close; - } - - if (current >= level) - goto out; - - rc = 0; -out_close: - fclose(f); -out: - return rc; -} - -static char auxv[4096]; - -void *get_auxv_entry(int type) -{ - ElfW(auxv_t) *p; - void *result; - ssize_t num; - int fd; - - fd = open("/proc/self/auxv", O_RDONLY); - if (fd == -1) { - perror("open"); - return NULL; - } - - result = NULL; - - num = read(fd, auxv, sizeof(auxv)); - if (num < 0) { - perror("read"); - goto out; - } - - if (num > sizeof(auxv)) { - printf("Overflowed auxv buffer\n"); - goto out; - } - - p = (ElfW(auxv_t) *)auxv; - - while (p->a_type != AT_NULL) { - if (p->a_type == type) { - result = (void *)p->a_un.a_val; - break; - } - - p++; - } -out: - close(fd); - return result; -} |