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 "utils.h"
27
28 #define THREADS 100 /* Max threads */
29 #define COUNT 100 /* Max iterations */
30 #define DSCR_MAX 16 /* Max DSCR value */
31 #define LEN_MAX 100 /* Max name length */
32
33 #define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default"
34 #define CPU_PATH "/sys/devices/system/cpu/"
35
36 #define rmb() asm volatile("lwsync":::"memory")
37 #define wmb() asm volatile("lwsync":::"memory")
38
39 #define READ_ONCE(x) (*(volatile typeof(x) *)&(x))
40
41 /* Prilvilege state DSCR access */
get_dscr(void)42 inline unsigned long get_dscr(void)
43 {
44 unsigned long ret;
45
46 asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR_PRIV));
47
48 return ret;
49 }
50
set_dscr(unsigned long val)51 inline void set_dscr(unsigned long val)
52 {
53 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR_PRIV));
54 }
55
56 /* Problem state DSCR access */
get_dscr_usr(void)57 inline unsigned long get_dscr_usr(void)
58 {
59 unsigned long ret;
60
61 asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR));
62
63 return ret;
64 }
65
set_dscr_usr(unsigned long val)66 inline void set_dscr_usr(unsigned long val)
67 {
68 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
69 }
70
71 /* Default DSCR access */
get_default_dscr(void)72 unsigned long get_default_dscr(void)
73 {
74 int fd = -1, ret;
75 char buf[16];
76 unsigned long val;
77
78 if (fd == -1) {
79 fd = open(DSCR_DEFAULT, O_RDONLY);
80 if (fd == -1) {
81 perror("open() failed");
82 exit(1);
83 }
84 }
85 memset(buf, 0, sizeof(buf));
86 lseek(fd, 0, SEEK_SET);
87 ret = read(fd, buf, sizeof(buf));
88 if (ret == -1) {
89 perror("read() failed");
90 exit(1);
91 }
92 sscanf(buf, "%lx", &val);
93 close(fd);
94 return val;
95 }
96
set_default_dscr(unsigned long val)97 void set_default_dscr(unsigned long val)
98 {
99 int fd = -1, ret;
100 char buf[16];
101
102 if (fd == -1) {
103 fd = open(DSCR_DEFAULT, O_RDWR);
104 if (fd == -1) {
105 perror("open() failed");
106 exit(1);
107 }
108 }
109 sprintf(buf, "%lx\n", val);
110 ret = write(fd, buf, strlen(buf));
111 if (ret == -1) {
112 perror("write() failed");
113 exit(1);
114 }
115 close(fd);
116 }
117
uniform_deviate(int seed)118 double uniform_deviate(int seed)
119 {
120 return seed * (1.0 / (RAND_MAX + 1.0));
121 }
122 #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */
123