1 /* 2 * POWER Data Stream Control Register (DSCR) sysfs thread test 3 * 4 * This test updates the system wide DSCR default value through 5 * sysfs interface which should then update all the CPU specific 6 * DSCR default values which must also be then visible to threads 7 * executing on individual CPUs on the system. 8 * 9 * Copyright 2015, Anshuman Khandual, IBM Corporation. 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 as published 13 * by the Free Software Foundation. 14 */ 15 #define _GNU_SOURCE 16 #include "dscr.h" 17 18 static int test_thread_dscr(unsigned long val) 19 { 20 unsigned long cur_dscr, cur_dscr_usr; 21 22 cur_dscr = get_dscr(); 23 cur_dscr_usr = get_dscr_usr(); 24 25 if (val != cur_dscr) { 26 printf("[cpu %d] Kernel DSCR should be %ld but is %ld\n", 27 sched_getcpu(), val, cur_dscr); 28 return 1; 29 } 30 31 if (val != cur_dscr_usr) { 32 printf("[cpu %d] User DSCR should be %ld but is %ld\n", 33 sched_getcpu(), val, cur_dscr_usr); 34 return 1; 35 } 36 return 0; 37 } 38 39 static int check_cpu_dscr_thread(unsigned long val) 40 { 41 cpu_set_t mask; 42 int cpu; 43 44 for (cpu = 0; cpu < CPU_SETSIZE; cpu++) { 45 CPU_ZERO(&mask); 46 CPU_SET(cpu, &mask); 47 if (sched_setaffinity(0, sizeof(mask), &mask)) 48 continue; 49 50 if (test_thread_dscr(val)) 51 return 1; 52 } 53 return 0; 54 55 } 56 57 int dscr_sysfs_thread(void) 58 { 59 unsigned long orig_dscr_default; 60 int i, j; 61 62 orig_dscr_default = get_default_dscr(); 63 for (i = 0; i < COUNT; i++) { 64 for (j = 0; j < DSCR_MAX; j++) { 65 set_default_dscr(j); 66 if (check_cpu_dscr_thread(j)) 67 goto fail; 68 } 69 } 70 set_default_dscr(orig_dscr_default); 71 return 0; 72 fail: 73 set_default_dscr(orig_dscr_default); 74 return 1; 75 } 76 77 int main(int argc, char *argv[]) 78 { 79 return test_harness(dscr_sysfs_thread, "dscr_sysfs_thread_test"); 80 } 81
