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 */
get_dscr(void)43 inline unsigned long get_dscr(void)
44 {
45 return mfspr(SPRN_DSCR_PRIV);
46 }
47
set_dscr(unsigned long val)48 inline void set_dscr(unsigned long val)
49 {
50 mtspr(SPRN_DSCR_PRIV, val);
51 }
52
53 /* Problem state DSCR access */
get_dscr_usr(void)54 inline unsigned long get_dscr_usr(void)
55 {
56 return mfspr(SPRN_DSCR);
57 }
58
set_dscr_usr(unsigned long val)59 inline void set_dscr_usr(unsigned long val)
60 {
61 mtspr(SPRN_DSCR, val);
62 }
63
64 /* Default DSCR access */
get_default_dscr(void)65 unsigned 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
set_default_dscr(unsigned long val)78 void 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