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
16static 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
43static 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		if (!(dp->d_type & DT_DIR))
57			continue;
58		if (!strcmp(dp->d_name, "cpuidle"))
59			continue;
60		if (!strstr(dp->d_name, "cpu"))
61			continue;
62
63		sprintf(file, "%s%s/dscr", CPU_PATH, dp->d_name);
64		if (access(file, F_OK))
65			continue;
66
67		if (check_cpu_dscr_default(file, val))
68			return 1;
69	}
70	closedir(sysfs);
71	return 0;
72}
73
74int dscr_sysfs(void)
75{
76	unsigned long orig_dscr_default;
77	int i, j;
78
79	orig_dscr_default = get_default_dscr();
80	for (i = 0; i < COUNT; i++) {
81		for (j = 0; j < DSCR_MAX; j++) {
82			set_default_dscr(j);
83			if (check_all_cpu_dscr_defaults(j))
84				goto fail;
85		}
86	}
87	set_default_dscr(orig_dscr_default);
88	return 0;
89fail:
90	set_default_dscr(orig_dscr_default);
91	return 1;
92}
93
94int main(int argc, char *argv[])
95{
96	return test_harness(dscr_sysfs, "dscr_sysfs_test");
97}
98