1 /* 2 * POWER Data Stream Control Register (DSCR) sysfs interface test 3 * 4 * This test updates to system wide DSCR default through the sysfs interface 5 * and then verifies that all the CPU specific DSCR defaults are updated as 6 * well verified from their sysfs interfaces. 7 * 8 * Copyright 2015, Anshuman Khandual, IBM Corporation. 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 as published 12 * by the Free Software Foundation. 13 */ 14 #include "dscr.h" 15 16 static int check_cpu_dscr_default(char *file, unsigned long val) 17 { 18 char buf[10]; 19 int fd, rc; 20 21 fd = open(file, O_RDWR); 22 if (fd == -1) { 23 perror("open() failed"); 24 return 1; 25 } 26 27 rc = read(fd, buf, sizeof(buf)); 28 if (rc == -1) { 29 perror("read() failed"); 30 return 1; 31 } 32 close(fd); 33 34 buf[rc] = '\0'; 35 if (strtol(buf, NULL, 16) != val) { 36 printf("DSCR match failed: %ld (system) %ld (cpu)\n", 37 val, strtol(buf, NULL, 16)); 38 return 1; 39 } 40 return 0; 41 } 42 43 static int check_all_cpu_dscr_defaults(unsigned long val) 44 { 45 DIR *sysfs; 46 struct dirent *dp; 47 char file[LEN_MAX]; 48 49 sysfs = opendir(CPU_PATH); 50 if (!sysfs) { 51 perror("opendir() failed"); 52 return 1; 53 } 54 55 while ((dp = readdir(sysfs))) { 56 int len; 57 58 if (!(dp->d_type & DT_DIR)) 59 continue; 60 if (!strcmp(dp->d_name, "cpuidle")) 61 continue; 62 if (!strstr(dp->d_name, "cpu")) 63 continue; 64 65 len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name); 66 if (len >= LEN_MAX) 67 continue; 68 if (access(file, F_OK)) 69 continue; 70 71 if (check_cpu_dscr_default(file, val)) 72 return 1; 73 } 74 closedir(sysfs); 75 return 0; 76 } 77 78 int dscr_sysfs(void) 79 { 80 unsigned long orig_dscr_default; 81 int i, j; 82 83 orig_dscr_default = get_default_dscr(); 84 for (i = 0; i < COUNT; i++) { 85 for (j = 0; j < DSCR_MAX; j++) { 86 set_default_dscr(j); 87 if (check_all_cpu_dscr_defaults(j)) 88 goto fail; 89 } 90 } 91 set_default_dscr(orig_dscr_default); 92 return 0; 93 fail: 94 set_default_dscr(orig_dscr_default); 95 return 1; 96 } 97 98 int main(int argc, char *argv[]) 99 { 100 return test_harness(dscr_sysfs, "dscr_sysfs_test"); 101 } 102