1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * POWER Data Stream Control Register (DSCR) sysfs thread test |
4 | * |
5 | * This test updates the system wide DSCR default value through |
6 | * sysfs interface which should then update all the CPU specific |
7 | * DSCR default values which must also be then visible to threads |
8 | * executing on individual CPUs on the system. |
9 | * |
10 | * Copyright 2015, Anshuman Khandual, IBM Corporation. |
11 | */ |
12 | #define _GNU_SOURCE |
13 | #include "dscr.h" |
14 | |
15 | static int test_thread_dscr(unsigned long val) |
16 | { |
17 | unsigned long cur_dscr, cur_dscr_usr; |
18 | |
19 | cur_dscr = get_dscr(); |
20 | cur_dscr_usr = get_dscr_usr(); |
21 | |
22 | if (val != cur_dscr) { |
23 | printf("[cpu %d] Kernel DSCR should be %ld but is %ld\n" , |
24 | sched_getcpu(), val, cur_dscr); |
25 | return 1; |
26 | } |
27 | |
28 | if (val != cur_dscr_usr) { |
29 | printf("[cpu %d] User DSCR should be %ld but is %ld\n" , |
30 | sched_getcpu(), val, cur_dscr_usr); |
31 | return 1; |
32 | } |
33 | return 0; |
34 | } |
35 | |
36 | static int check_cpu_dscr_thread(unsigned long val) |
37 | { |
38 | cpu_set_t mask; |
39 | int cpu; |
40 | |
41 | for (cpu = 0; cpu < CPU_SETSIZE; cpu++) { |
42 | CPU_ZERO(&mask); |
43 | CPU_SET(cpu, &mask); |
44 | if (sched_setaffinity(0, sizeof(mask), &mask)) |
45 | continue; |
46 | |
47 | if (test_thread_dscr(val)) |
48 | return 1; |
49 | } |
50 | return 0; |
51 | |
52 | } |
53 | |
54 | int dscr_sysfs_thread(void) |
55 | { |
56 | unsigned long orig_dscr_default; |
57 | int i, j; |
58 | |
59 | SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR)); |
60 | |
61 | orig_dscr_default = get_default_dscr(); |
62 | for (i = 0; i < COUNT; i++) { |
63 | for (j = 0; j < DSCR_MAX; j++) { |
64 | set_default_dscr(j); |
65 | if (check_cpu_dscr_thread(val: j)) |
66 | goto fail; |
67 | } |
68 | } |
69 | set_default_dscr(orig_dscr_default); |
70 | return 0; |
71 | fail: |
72 | set_default_dscr(orig_dscr_default); |
73 | return 1; |
74 | } |
75 | |
76 | int main(int argc, char *argv[]) |
77 | { |
78 | return test_harness(dscr_sysfs_thread, "dscr_sysfs_thread_test" ); |
79 | } |
80 | |