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
test_thread_dscr(unsigned long val)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
check_cpu_dscr_thread(unsigned long val)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
dscr_sysfs_thread(void)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
main(int argc,char * argv[])77 int main(int argc, char *argv[])
78 {
79 return test_harness(dscr_sysfs_thread, "dscr_sysfs_thread_test");
80 }
81