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