/* * POWER Data Stream Control Register (DSCR) sysfs interface test * * This test updates to system wide DSCR default through the sysfs interface * and then verifies that all the CPU specific DSCR defaults are updated as * well verified from their sysfs interfaces. * * Copyright 2015, Anshuman Khandual, IBM Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include "dscr.h" static int check_cpu_dscr_default(char *file, unsigned long val) { char buf[10]; int fd, rc; fd = open(file, O_RDWR); if (fd == -1) { perror("open() failed"); return 1; } rc = read(fd, buf, sizeof(buf)); if (rc == -1) { perror("read() failed"); return 1; } close(fd); buf[rc] = '\0'; if (strtol(buf, NULL, 16) != val) { printf("DSCR match failed: %ld (system) %ld (cpu)\n", val, strtol(buf, NULL, 16)); return 1; } return 0; } static int check_all_cpu_dscr_defaults(unsigned long val) { DIR *sysfs; struct dirent *dp; char file[LEN_MAX]; sysfs = opendir(CPU_PATH); if (!sysfs) { perror("opendir() failed"); return 1; } while ((dp = readdir(sysfs))) { int len; if (!(dp->d_type & DT_DIR)) continue; if (!strcmp(dp->d_name, "cpuidle")) continue; if (!strstr(dp->d_name, "cpu")) continue; len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name); if (len >= LEN_MAX) continue; if (access(file, F_OK)) continue; if (check_cpu_dscr_default(file, val)) return 1; } closedir(sysfs); return 0; } int dscr_sysfs(void) { unsigned long orig_dscr_default; int i, j; orig_dscr_default = get_default_dscr(); for (i = 0; i < COUNT; i++) { for (j = 0; j < DSCR_MAX; j++) { set_default_dscr(j); if (check_all_cpu_dscr_defaults(j)) goto fail; } } set_default_dscr(orig_dscr_default); return 0; fail: set_default_dscr(orig_dscr_default); return 1; } int main(int argc, char *argv[]) { return test_harness(dscr_sysfs, "dscr_sysfs_test"); }