2 * POWER Data Stream Control Register (DSCR) sysfs thread test
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.
9 * Copyright 2015, Anshuman Khandual, IBM Corporation.
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.
18 static int test_thread_dscr(unsigned long val)
20 unsigned long cur_dscr, cur_dscr_usr;
22 cur_dscr = get_dscr();
23 cur_dscr_usr = get_dscr_usr();
25 if (val != cur_dscr) {
26 printf("[cpu %d] Kernel DSCR should be %ld but is %ld\n",
27 sched_getcpu(), val, cur_dscr);
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);
39 static int check_cpu_dscr_thread(unsigned long val)
44 for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
47 if (sched_setaffinity(0, sizeof(mask), &mask))
50 if (test_thread_dscr(val))
57 int dscr_sysfs_thread(void)
59 unsigned long orig_dscr_default;
62 orig_dscr_default = get_default_dscr();
63 for (i = 0; i < COUNT; i++) {
64 for (j = 0; j < DSCR_MAX; j++) {
66 if (check_cpu_dscr_thread(j))
70 set_default_dscr(orig_dscr_default);
73 set_default_dscr(orig_dscr_default);
77 int main(int argc, char *argv[])
79 return test_harness(dscr_sysfs_thread, "dscr_sysfs_thread_test");