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 */ 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 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 */ 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 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 */ 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 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 } 117 118 double uniform_deviate(int seed) 119 { 120 return seed * (1.0 / (RAND_MAX + 1.0)); 121 } 122 #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */ 123