1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * POWER Data Stream Control Register (DSCR)
4 *
5 * This header file contains helper functions and macros
6 * required for all the DSCR related test cases.
7 *
8 * Copyright 2012, Anton Blanchard, IBM Corporation.
9 * Copyright 2015, Anshuman Khandual, IBM Corporation.
10 */
11#ifndef _SELFTESTS_POWERPC_DSCR_DSCR_H
12#define _SELFTESTS_POWERPC_DSCR_DSCR_H
13
14#include <unistd.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <string.h>
18#include <fcntl.h>
19#include <dirent.h>
20#include <pthread.h>
21#include <sched.h>
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <sys/wait.h>
25
26#include "reg.h"
27#include "utils.h"
28
29#define THREADS 100 /* Max threads */
30#define COUNT 100 /* Max iterations */
31#define DSCR_MAX 16 /* Max DSCR value */
32#define LEN_MAX 100 /* Max name length */
33
34#define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default"
35#define CPU_PATH "/sys/devices/system/cpu/"
36
37#define rmb() asm volatile("lwsync":::"memory")
38#define wmb() asm volatile("lwsync":::"memory")
39
40#define READ_ONCE(x) (*(volatile typeof(x) *)&(x))
41
42/* Prilvilege state DSCR access */
43inline unsigned long get_dscr(void)
44{
45 return mfspr(SPRN_DSCR_PRIV);
46}
47
48inline void set_dscr(unsigned long val)
49{
50 mtspr(SPRN_DSCR_PRIV, val);
51}
52
53/* Problem state DSCR access */
54inline unsigned long get_dscr_usr(void)
55{
56 return mfspr(SPRN_DSCR);
57}
58
59inline void set_dscr_usr(unsigned long val)
60{
61 mtspr(SPRN_DSCR, val);
62}
63
64/* Default DSCR access */
65unsigned long get_default_dscr(void)
66{
67 int err;
68 unsigned long val;
69
70 err = read_ulong(DSCR_DEFAULT, &val, 16);
71 if (err) {
72 perror("read() failed");
73 exit(1);
74 }
75 return val;
76}
77
78void set_default_dscr(unsigned long val)
79{
80 int err;
81
82 err = write_ulong(DSCR_DEFAULT, val, 16);
83 if (err) {
84 perror("write() failed");
85 exit(1);
86 }
87}
88
89#endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */
90

source code of linux/tools/testing/selftests/powerpc/dscr/dscr.h