1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * POWER Data Stream Control Register (DSCR) sysfs interface test |
4 | * |
5 | * This test updates to system wide DSCR default through the sysfs interface |
6 | * and then verifies that all the CPU specific DSCR defaults are updated as |
7 | * well verified from their sysfs interfaces. |
8 | * |
9 | * Copyright 2015, Anshuman Khandual, IBM Corporation. |
10 | */ |
11 | #include "dscr.h" |
12 | |
13 | static int check_cpu_dscr_default(char *file, unsigned long val) |
14 | { |
15 | unsigned long cpu_dscr; |
16 | int err; |
17 | |
18 | err = read_ulong(file, &cpu_dscr, 16); |
19 | if (err) |
20 | return err; |
21 | |
22 | if (cpu_dscr != val) { |
23 | printf("DSCR match failed: %ld (system) %ld (cpu)\n" , |
24 | val, cpu_dscr); |
25 | return 1; |
26 | } |
27 | return 0; |
28 | } |
29 | |
30 | static int check_all_cpu_dscr_defaults(unsigned long val) |
31 | { |
32 | DIR *sysfs; |
33 | struct dirent *dp; |
34 | char file[LEN_MAX]; |
35 | |
36 | sysfs = opendir(CPU_PATH); |
37 | if (!sysfs) { |
38 | perror("opendir() failed" ); |
39 | return 1; |
40 | } |
41 | |
42 | while ((dp = readdir(sysfs))) { |
43 | int len; |
44 | |
45 | if (!(dp->d_type & DT_DIR)) |
46 | continue; |
47 | if (!strcmp(dp->d_name, "cpuidle" )) |
48 | continue; |
49 | if (!strstr(dp->d_name, "cpu" )) |
50 | continue; |
51 | |
52 | len = snprintf(file, LEN_MAX, "%s%s/dscr" , CPU_PATH, dp->d_name); |
53 | if (len >= LEN_MAX) |
54 | continue; |
55 | if (access(file, F_OK)) |
56 | continue; |
57 | |
58 | if (check_cpu_dscr_default(file, val)) { |
59 | closedir(sysfs); |
60 | return 1; |
61 | } |
62 | } |
63 | closedir(sysfs); |
64 | return 0; |
65 | } |
66 | |
67 | int dscr_sysfs(void) |
68 | { |
69 | unsigned long orig_dscr_default; |
70 | |
71 | SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR)); |
72 | |
73 | orig_dscr_default = get_default_dscr(); |
74 | for (int i = 0; i < DSCR_MAX; i++) { |
75 | set_default_dscr(i); |
76 | if (check_all_cpu_dscr_defaults(val: i)) |
77 | goto fail; |
78 | } |
79 | set_default_dscr(orig_dscr_default); |
80 | return 0; |
81 | fail: |
82 | set_default_dscr(orig_dscr_default); |
83 | return 1; |
84 | } |
85 | |
86 | int main(int argc, char *argv[]) |
87 | { |
88 | return test_harness(dscr_sysfs, "dscr_sysfs_test" ); |
89 | } |
90 | |