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 #define H_PTE_FRAG_NR 0 42 #define H_PTE_FRAG_SIZE_SHIFT 0 43 44 /* memory key bits, only 8 keys supported */ 45 #define H_PTE_PKEY_BIT0 0 46 #define H_PTE_PKEY_BIT1 0 47 #define H_PTE_PKEY_BIT2 _RPAGE_RSV3 48 #define H_PTE_PKEY_BIT3 _RPAGE_RSV4 49 #define H_PTE_PKEY_BIT4 _RPAGE_RSV5 50 51 /* 52 * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() 53 */ 54 #define remap_4k_pfn(vma, addr, pfn, prot) \ 55 remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) 56 57 #ifdef CONFIG_HUGETLB_PAGE 58 static inline int hash__hugepd_ok(hugepd_t hpd) 59 { 60 unsigned long hpdval = hpd_val(hpd); 61 /* 62 * if it is not a pte and have hugepd shift mask 63 * set, then it is a hugepd directory pointer 64 */ 65 if (!(hpdval & _PAGE_PTE) && 66 ((hpdval & HUGEPD_SHIFT_MASK) != 0)) 67 return true; 68 return false; 69 } 70 #endif 71 72 /* 73 * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just 74 * a matter of returning the PTE bits that need to be modified. On 64K PTE, 75 * things are a little more involved and hence needs many more parameters to 76 * accomplish the same. However we want to abstract this out from the caller by 77 * keeping the prototype consistent across the two formats. 78 */ 79 static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, 80 unsigned int subpg_index, unsigned long hidx, 81 int offset) 82 { 83 return (hidx << H_PAGE_F_GIX_SHIFT) & 84 (H_PAGE_F_SECOND | H_PAGE_F_GIX); 85 } 86 87 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 88 89 static inline char *get_hpte_slot_array(pmd_t *pmdp) 90 { 91 BUG(); 92 return NULL; 93 } 94 95 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) 96 { 97 BUG(); 98 return 0; 99 } 100 101 static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, 102 int index) 103 { 104 BUG(); 105 return 0; 106 } 107 108 static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, 109 unsigned int index, unsigned int hidx) 110 { 111 BUG(); 112 } 113 114 static inline int hash__pmd_trans_huge(pmd_t pmd) 115 { 116 return 0; 117 } 118 119 static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) 120 { 121 BUG(); 122 return 0; 123 } 124 125 static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) 126 { 127 BUG(); 128 return pmd; 129 } 130 131 extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, 132 unsigned long addr, pmd_t *pmdp, 133 unsigned long clr, unsigned long set); 134 extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, 135 unsigned long address, pmd_t *pmdp); 136 extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 137 pgtable_t pgtable); 138 extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 139 extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, 140 unsigned long addr, pmd_t *pmdp); 141 extern int hash__has_transparent_hugepage(void); 142 #endif 143 144 #endif /* !__ASSEMBLY__ */ 145 146 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ 147