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