1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright 2015, Michael Ellerman, IBM Corp. 4 */ 5 6 #ifndef _SELFTESTS_POWERPC_TM_TM_H 7 #define _SELFTESTS_POWERPC_TM_TM_H 8 9 #include <stdbool.h> 10 #include <asm/tm.h> 11 12 #include "utils.h" 13 #include "reg.h" 14 15 #define TM_RETRIES 100 16 17 static inline bool have_htm(void) 18 { 19 #ifdef PPC_FEATURE2_HTM 20 return have_hwcap2(PPC_FEATURE2_HTM); 21 #else 22 printf("PPC_FEATURE2_HTM not defined, can't check AT_HWCAP2\n"); 23 return false; 24 #endif 25 } 26 27 static inline bool have_htm_nosc(void) 28 { 29 #ifdef PPC_FEATURE2_HTM_NOSC 30 return have_hwcap2(PPC_FEATURE2_HTM_NOSC); 31 #else 32 printf("PPC_FEATURE2_HTM_NOSC not defined, can't check AT_HWCAP2\n"); 33 return false; 34 #endif 35 } 36 37 /* 38 * Transactional Memory was removed in ISA 3.1. A synthetic TM implementation 39 * is provided on P10 for threads running in P8/P9 compatibility mode. The 40 * synthetic implementation immediately fails after tbegin. This failure sets 41 * Bit 7 (Failure Persistent) and Bit 15 (Implementation-specific). 42 */ 43 static inline bool htm_is_synthetic(void) 44 { 45 int i; 46 47 /* 48 * Per the ISA, the Failure Persistent bit may be incorrect. Try a few 49 * times in case we got an Implementation-specific failure on a non ISA 50 * v3.1 system. On these systems the Implementation-specific failure 51 * should not be persistent. 52 */ 53 for (i = 0; i < TM_RETRIES; i++) { 54 asm volatile( 55 "tbegin.;" 56 "beq 1f;" 57 "tend.;" 58 "1:" 59 : 60 : 61 : "memory"); 62 63 if ((__builtin_get_texasr() & (TEXASR_FP | TEXASR_IC)) != 64 (TEXASR_FP | TEXASR_IC)) 65 break; 66 } 67 return i == TM_RETRIES; 68 } 69 70 static inline long failure_code(void) 71 { 72 return __builtin_get_texasru() >> 24; 73 } 74 75 static inline bool failure_is_persistent(void) 76 { 77 return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT; 78 } 79 80 static inline bool failure_is_syscall(void) 81 { 82 return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL; 83 } 84 85 static inline bool failure_is_unavailable(void) 86 { 87 return (failure_code() & TM_CAUSE_FAC_UNAV) == TM_CAUSE_FAC_UNAV; 88 } 89 90 static inline bool failure_is_reschedule(void) 91 { 92 if ((failure_code() & TM_CAUSE_RESCHED) == TM_CAUSE_RESCHED || 93 (failure_code() & TM_CAUSE_KVM_RESCHED) == TM_CAUSE_KVM_RESCHED || 94 (failure_code() & TM_CAUSE_KVM_FAC_UNAV) == TM_CAUSE_KVM_FAC_UNAV) 95 return true; 96 97 return false; 98 } 99 100 static inline bool failure_is_nesting(void) 101 { 102 return (__builtin_get_texasru() & 0x400000); 103 } 104 105 static inline int tcheck(void) 106 { 107 long cr; 108 asm volatile ("tcheck 0" : "=r"(cr) : : "cr0"); 109 return (cr >> 28) & 4; 110 } 111 112 static inline bool tcheck_doomed(void) 113 { 114 return tcheck() & 8; 115 } 116 117 static inline bool tcheck_active(void) 118 { 119 return tcheck() & 4; 120 } 121 122 static inline bool tcheck_suspended(void) 123 { 124 return tcheck() & 2; 125 } 126 127 static inline bool tcheck_transactional(void) 128 { 129 return tcheck() & 6; 130 } 131 132 #endif /* _SELFTESTS_POWERPC_TM_TM_H */ 133