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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Copyright IBM Corp. 2024 |
| 4 | */ |
| 5 | |
| 6 | #ifndef __ASM_S390_MACHINE_H |
| 7 | #define __ASM_S390_MACHINE_H |
| 8 | |
| 9 | #include <linux/const.h> |
| 10 | |
| 11 | #define MFEATURE_LOWCORE 0 |
| 12 | #define MFEATURE_PCI_MIO 1 |
| 13 | #define MFEATURE_SCC 2 |
| 14 | #define MFEATURE_TLB_GUEST 3 |
| 15 | #define MFEATURE_TX 4 |
| 16 | #define MFEATURE_ESOP 5 |
| 17 | #define MFEATURE_DIAG9C 6 |
| 18 | #define MFEATURE_VM 7 |
| 19 | #define MFEATURE_KVM 8 |
| 20 | #define MFEATURE_LPAR 9 |
| 21 | #define MFEATURE_DIAG288 10 |
| 22 | |
| 23 | #ifndef __ASSEMBLER__ |
| 24 | |
| 25 | #include <linux/bitops.h> |
| 26 | #include <asm/alternative.h> |
| 27 | |
| 28 | extern unsigned long machine_features[1]; |
| 29 | |
| 30 | #define MAX_MFEATURE_BIT (sizeof(machine_features) * BITS_PER_BYTE) |
| 31 | |
| 32 | static inline void __set_machine_feature(unsigned int nr, unsigned long *mfeatures) |
| 33 | { |
| 34 | if (nr >= MAX_MFEATURE_BIT) |
| 35 | return; |
| 36 | __set_bit(nr, mfeatures); |
| 37 | } |
| 38 | |
| 39 | static inline void set_machine_feature(unsigned int nr) |
| 40 | { |
| 41 | __set_machine_feature(nr, machine_features); |
| 42 | } |
| 43 | |
| 44 | static inline void __clear_machine_feature(unsigned int nr, unsigned long *mfeatures) |
| 45 | { |
| 46 | if (nr >= MAX_MFEATURE_BIT) |
| 47 | return; |
| 48 | __clear_bit(nr, mfeatures); |
| 49 | } |
| 50 | |
| 51 | static inline void clear_machine_feature(unsigned int nr) |
| 52 | { |
| 53 | __clear_machine_feature(nr, machine_features); |
| 54 | } |
| 55 | |
| 56 | static bool __test_machine_feature(unsigned int nr, unsigned long *mfeatures) |
| 57 | { |
| 58 | if (nr >= MAX_MFEATURE_BIT) |
| 59 | return false; |
| 60 | return test_bit(nr, mfeatures); |
| 61 | } |
| 62 | |
| 63 | static bool test_machine_feature(unsigned int nr) |
| 64 | { |
| 65 | return __test_machine_feature(nr, machine_features); |
| 66 | } |
| 67 | |
| 68 | static __always_inline bool __test_machine_feature_constant(unsigned int nr) |
| 69 | { |
| 70 | asm goto( |
| 71 | ALTERNATIVE("brcl 15,%l[l_no]", "brcl 0,0", ALT_FEATURE(%[nr])) |
| 72 | : |
| 73 | : [nr] "i" (nr) |
| 74 | : |
| 75 | : l_no); |
| 76 | return true; |
| 77 | l_no: |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | #define DEFINE_MACHINE_HAS_FEATURE(name, feature) \ |
| 82 | static __always_inline bool machine_has_##name(void) \ |
| 83 | { \ |
| 84 | if (!__is_defined(__DECOMPRESSOR) && __builtin_constant_p(feature)) \ |
| 85 | return __test_machine_feature_constant(feature); \ |
| 86 | return test_machine_feature(feature); \ |
| 87 | } |
| 88 | |
| 89 | DEFINE_MACHINE_HAS_FEATURE(relocated_lowcore, MFEATURE_LOWCORE) |
| 90 | DEFINE_MACHINE_HAS_FEATURE(scc, MFEATURE_SCC) |
| 91 | DEFINE_MACHINE_HAS_FEATURE(tlb_guest, MFEATURE_TLB_GUEST) |
| 92 | DEFINE_MACHINE_HAS_FEATURE(tx, MFEATURE_TX) |
| 93 | DEFINE_MACHINE_HAS_FEATURE(esop, MFEATURE_ESOP) |
| 94 | DEFINE_MACHINE_HAS_FEATURE(diag9c, MFEATURE_DIAG9C) |
| 95 | DEFINE_MACHINE_HAS_FEATURE(vm, MFEATURE_VM) |
| 96 | DEFINE_MACHINE_HAS_FEATURE(kvm, MFEATURE_KVM) |
| 97 | DEFINE_MACHINE_HAS_FEATURE(lpar, MFEATURE_LPAR) |
| 98 | |
| 99 | #define machine_is_vm machine_has_vm |
| 100 | #define machine_is_kvm machine_has_kvm |
| 101 | #define machine_is_lpar machine_has_lpar |
| 102 | |
| 103 | #endif /* __ASSEMBLER__ */ |
| 104 | #endif /* __ASM_S390_MACHINE_H */ |
| 105 |
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