1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2ebd5858cSAnshuman Khandual /*
3ebd5858cSAnshuman Khandual * POWER Data Stream Control Register (DSCR) sysfs interface test
4ebd5858cSAnshuman Khandual *
5ebd5858cSAnshuman Khandual * This test updates to system wide DSCR default through the sysfs interface
6ebd5858cSAnshuman Khandual * and then verifies that all the CPU specific DSCR defaults are updated as
7ebd5858cSAnshuman Khandual * well verified from their sysfs interfaces.
8ebd5858cSAnshuman Khandual *
9ebd5858cSAnshuman Khandual * Copyright 2015, Anshuman Khandual, IBM Corporation.
10ebd5858cSAnshuman Khandual */
11ebd5858cSAnshuman Khandual #include "dscr.h"
12ebd5858cSAnshuman Khandual
check_cpu_dscr_default(char * file,unsigned long val)13ebd5858cSAnshuman Khandual static int check_cpu_dscr_default(char *file, unsigned long val)
14ebd5858cSAnshuman Khandual {
155c20de57SBenjamin Gray unsigned long cpu_dscr;
165c20de57SBenjamin Gray int err;
17ebd5858cSAnshuman Khandual
185c20de57SBenjamin Gray err = read_ulong(file, &cpu_dscr, 16);
195c20de57SBenjamin Gray if (err)
205c20de57SBenjamin Gray return err;
21ebd5858cSAnshuman Khandual
225c20de57SBenjamin Gray if (cpu_dscr != val) {
23ebd5858cSAnshuman Khandual printf("DSCR match failed: %ld (system) %ld (cpu)\n",
245c20de57SBenjamin Gray val, cpu_dscr);
25ebd5858cSAnshuman Khandual return 1;
26ebd5858cSAnshuman Khandual }
27ebd5858cSAnshuman Khandual return 0;
28ebd5858cSAnshuman Khandual }
29ebd5858cSAnshuman Khandual
check_all_cpu_dscr_defaults(unsigned long val)30ebd5858cSAnshuman Khandual static int check_all_cpu_dscr_defaults(unsigned long val)
31ebd5858cSAnshuman Khandual {
32ebd5858cSAnshuman Khandual DIR *sysfs;
33ebd5858cSAnshuman Khandual struct dirent *dp;
34ebd5858cSAnshuman Khandual char file[LEN_MAX];
35ebd5858cSAnshuman Khandual
36ebd5858cSAnshuman Khandual sysfs = opendir(CPU_PATH);
37ebd5858cSAnshuman Khandual if (!sysfs) {
38ebd5858cSAnshuman Khandual perror("opendir() failed");
39ebd5858cSAnshuman Khandual return 1;
40ebd5858cSAnshuman Khandual }
41ebd5858cSAnshuman Khandual
42ebd5858cSAnshuman Khandual while ((dp = readdir(sysfs))) {
4306755a87SSeth Forshee int len;
4406755a87SSeth Forshee
45ebd5858cSAnshuman Khandual if (!(dp->d_type & DT_DIR))
46ebd5858cSAnshuman Khandual continue;
47ebd5858cSAnshuman Khandual if (!strcmp(dp->d_name, "cpuidle"))
48ebd5858cSAnshuman Khandual continue;
49ebd5858cSAnshuman Khandual if (!strstr(dp->d_name, "cpu"))
50ebd5858cSAnshuman Khandual continue;
51ebd5858cSAnshuman Khandual
5206755a87SSeth Forshee len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
5306755a87SSeth Forshee if (len >= LEN_MAX)
5406755a87SSeth Forshee continue;
55ebd5858cSAnshuman Khandual if (access(file, F_OK))
56ebd5858cSAnshuman Khandual continue;
57ebd5858cSAnshuman Khandual
588f4ab7daSMiaoqian Lin if (check_cpu_dscr_default(file, val)) {
598f4ab7daSMiaoqian Lin closedir(sysfs);
60ebd5858cSAnshuman Khandual return 1;
61ebd5858cSAnshuman Khandual }
628f4ab7daSMiaoqian Lin }
63ebd5858cSAnshuman Khandual closedir(sysfs);
64ebd5858cSAnshuman Khandual return 0;
65ebd5858cSAnshuman Khandual }
66ebd5858cSAnshuman Khandual
dscr_sysfs(void)67ebd5858cSAnshuman Khandual int dscr_sysfs(void)
68ebd5858cSAnshuman Khandual {
69ebd5858cSAnshuman Khandual unsigned long orig_dscr_default;
70ebd5858cSAnshuman Khandual
714c3c3c50SMichael Ellerman SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));
724c3c3c50SMichael Ellerman
73ebd5858cSAnshuman Khandual orig_dscr_default = get_default_dscr();
74*c14a9d0aSBenjamin Gray for (int i = 0; i < DSCR_MAX; i++) {
75*c14a9d0aSBenjamin Gray set_default_dscr(i);
76*c14a9d0aSBenjamin Gray if (check_all_cpu_dscr_defaults(i))
77ebd5858cSAnshuman Khandual goto fail;
78ebd5858cSAnshuman Khandual }
79ebd5858cSAnshuman Khandual set_default_dscr(orig_dscr_default);
80ebd5858cSAnshuman Khandual return 0;
81ebd5858cSAnshuman Khandual fail:
82ebd5858cSAnshuman Khandual set_default_dscr(orig_dscr_default);
83ebd5858cSAnshuman Khandual return 1;
84ebd5858cSAnshuman Khandual }
85ebd5858cSAnshuman Khandual
main(int argc,char * argv[])86ebd5858cSAnshuman Khandual int main(int argc, char *argv[])
87ebd5858cSAnshuman Khandual {
88ebd5858cSAnshuman Khandual return test_harness(dscr_sysfs, "dscr_sysfs_test");
89ebd5858cSAnshuman Khandual }
90