1 /*
2 * POWER Data Stream Control Register (DSCR) sysfs interface test
3 *
4 * This test updates to system wide DSCR default through the sysfs interface
5 * and then verifies that all the CPU specific DSCR defaults are updated as
6 * well verified from their sysfs interfaces.
7 *
8 * Copyright 2015, Anshuman Khandual, IBM Corporation.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 */
14 #include "dscr.h"
15
check_cpu_dscr_default(char * file,unsigned long val)16 static int check_cpu_dscr_default(char *file, unsigned long val)
17 {
18 char buf[10];
19 int fd, rc;
20
21 fd = open(file, O_RDWR);
22 if (fd == -1) {
23 perror("open() failed");
24 return 1;
25 }
26
27 rc = read(fd, buf, sizeof(buf));
28 if (rc == -1) {
29 perror("read() failed");
30 return 1;
31 }
32 close(fd);
33
34 buf[rc] = '\0';
35 if (strtol(buf, NULL, 16) != val) {
36 printf("DSCR match failed: %ld (system) %ld (cpu)\n",
37 val, strtol(buf, NULL, 16));
38 return 1;
39 }
40 return 0;
41 }
42
check_all_cpu_dscr_defaults(unsigned long val)43 static int check_all_cpu_dscr_defaults(unsigned long val)
44 {
45 DIR *sysfs;
46 struct dirent *dp;
47 char file[LEN_MAX];
48
49 sysfs = opendir(CPU_PATH);
50 if (!sysfs) {
51 perror("opendir() failed");
52 return 1;
53 }
54
55 while ((dp = readdir(sysfs))) {
56 int len;
57
58 if (!(dp->d_type & DT_DIR))
59 continue;
60 if (!strcmp(dp->d_name, "cpuidle"))
61 continue;
62 if (!strstr(dp->d_name, "cpu"))
63 continue;
64
65 len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
66 if (len >= LEN_MAX)
67 continue;
68 if (access(file, F_OK))
69 continue;
70
71 if (check_cpu_dscr_default(file, val))
72 return 1;
73 }
74 closedir(sysfs);
75 return 0;
76 }
77
dscr_sysfs(void)78 int dscr_sysfs(void)
79 {
80 unsigned long orig_dscr_default;
81 int i, j;
82
83 orig_dscr_default = get_default_dscr();
84 for (i = 0; i < COUNT; i++) {
85 for (j = 0; j < DSCR_MAX; j++) {
86 set_default_dscr(j);
87 if (check_all_cpu_dscr_defaults(j))
88 goto fail;
89 }
90 }
91 set_default_dscr(orig_dscr_default);
92 return 0;
93 fail:
94 set_default_dscr(orig_dscr_default);
95 return 1;
96 }
97
main(int argc,char * argv[])98 int main(int argc, char *argv[])
99 {
100 return test_harness(dscr_sysfs, "dscr_sysfs_test");
101 }
102