| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H |
| 3 | #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H |
| 4 | /* |
| 5 | * Entries per page directory level. The PTE level must use a 64b record |
| 6 | * for each page table entry. The PMD and PGD level use a 32b record for |
| 7 | * each entry by assuming that each entry is page aligned. |
| 8 | */ |
| 9 | #define H_PTE_INDEX_SIZE 9 |
| 10 | #define H_PMD_INDEX_SIZE 7 |
| 11 | #define H_PUD_INDEX_SIZE 9 |
| 12 | #define H_PGD_INDEX_SIZE 9 |
| 13 | |
| 14 | /* |
| 15 | * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB |
| 16 | * Hence also limit max EA bits to 64TB. |
| 17 | */ |
| 18 | #define MAX_EA_BITS_PER_CONTEXT 46 |
| 19 | |
| 20 | #ifndef __ASSEMBLY__ |
| 21 | #define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE) |
| 22 | #define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE) |
| 23 | #define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE) |
| 24 | #define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE) |
| 25 | |
| 26 | #define H_PAGE_F_GIX_SHIFT 53 |
| 27 | #define H_PAGE_F_SECOND _RPAGE_RPN44 /* HPTE is in 2ndary HPTEG */ |
| 28 | #define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41) |
| 29 | #define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */ |
| 30 | #define H_PAGE_HASHPTE _RPAGE_RSV2 /* software: PTE & hash are busy */ |
| 31 | |
| 32 | /* PTE flags to conserve for HPTE identification */ |
| 33 | #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \ |
| 34 | H_PAGE_F_SECOND | H_PAGE_F_GIX) |
| 35 | /* |
| 36 | * Not supported by 4k linux page size |
| 37 | */ |
| 38 | #define H_PAGE_4K_PFN 0x0 |
| 39 | #define H_PAGE_THP_HUGE 0x0 |
| 40 | #define H_PAGE_COMBO 0x0 |
| 41 | |
| 42 | /* 8 bytes per each pte entry */ |
| 43 | #define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3) |
| 44 | #define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT) |
| 45 | |
| 46 | /* memory key bits, only 8 keys supported */ |
| 47 | #define H_PTE_PKEY_BIT0 0 |
| 48 | #define H_PTE_PKEY_BIT1 0 |
| 49 | #define H_PTE_PKEY_BIT2 _RPAGE_RSV3 |
| 50 | #define H_PTE_PKEY_BIT3 _RPAGE_RSV4 |
| 51 | #define H_PTE_PKEY_BIT4 _RPAGE_RSV5 |
| 52 | |
| 53 | /* |
| 54 | * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() |
| 55 | */ |
| 56 | #define remap_4k_pfn(vma, addr, pfn, prot) \ |
| 57 | remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) |
| 58 | |
| 59 | #ifdef CONFIG_HUGETLB_PAGE |
| 60 | static inline int hash__hugepd_ok(hugepd_t hpd) |
| 61 | { |
| 62 | unsigned long hpdval = hpd_val(hpd); |
| 63 | /* |
| 64 | * if it is not a pte and have hugepd shift mask |
| 65 | * set, then it is a hugepd directory pointer |
| 66 | */ |
| 67 | if (!(hpdval & _PAGE_PTE) && |
| 68 | ((hpdval & HUGEPD_SHIFT_MASK) != 0)) |
| 69 | return true; |
| 70 | return false; |
| 71 | } |
| 72 | #endif |
| 73 | |
| 74 | /* |
| 75 | * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just |
| 76 | * a matter of returning the PTE bits that need to be modified. On 64K PTE, |
| 77 | * things are a little more involved and hence needs many more parameters to |
| 78 | * accomplish the same. However we want to abstract this out from the caller by |
| 79 | * keeping the prototype consistent across the two formats. |
| 80 | */ |
| 81 | static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, |
| 82 | unsigned int subpg_index, unsigned long hidx, |
| 83 | int offset) |
| 84 | { |
| 85 | return (hidx << H_PAGE_F_GIX_SHIFT) & |
| 86 | (H_PAGE_F_SECOND | H_PAGE_F_GIX); |
| 87 | } |
| 88 | |
| 89 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 90 | |
| 91 | static inline char *get_hpte_slot_array(pmd_t *pmdp) |
| 92 | { |
| 93 | BUG(); |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) |
| 98 | { |
| 99 | BUG(); |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, |
| 104 | int index) |
| 105 | { |
| 106 | BUG(); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, |
| 111 | unsigned int index, unsigned int hidx) |
| 112 | { |
| 113 | BUG(); |
| 114 | } |
| 115 | |
| 116 | static inline int hash__pmd_trans_huge(pmd_t pmd) |
| 117 | { |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) |
| 122 | { |
| 123 | BUG(); |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) |
| 128 | { |
| 129 | BUG(); |
| 130 | return pmd; |
| 131 | } |
| 132 | |
| 133 | extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, |
| 134 | unsigned long addr, pmd_t *pmdp, |
| 135 | unsigned long clr, unsigned long set); |
| 136 | extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, |
| 137 | unsigned long address, pmd_t *pmdp); |
| 138 | extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
| 139 | pgtable_t pgtable); |
| 140 | extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); |
| 141 | extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, |
| 142 | unsigned long addr, pmd_t *pmdp); |
| 143 | extern int hash__has_transparent_hugepage(void); |
| 144 | #endif |
| 145 | |
| 146 | #endif /* !__ASSEMBLY__ */ |
| 147 | |
| 148 | #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |