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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /* SPDX-License-Identifier: GPL-2.0 */ /* * S390 version * Copyright IBM Corp. 1999, 2000 * Author(s): Hartmut Penner (hp@de.ibm.com) * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "include/asm-i386/pgalloc.h" * Copyright (C) 1994 Linus Torvalds */ #ifndef _S390_PGALLOC_H #define _S390_PGALLOC_H #include <linux/threads.h> #include <linux/string.h> #include <linux/gfp.h> #include <linux/mm.h> #define CRST_ALLOC_ORDER 2 unsigned long *crst_table_alloc(struct mm_struct *); void crst_table_free(struct mm_struct *, unsigned long *); unsigned long *page_table_alloc(struct mm_struct *); struct page *page_table_alloc_pgste(struct mm_struct *mm); void page_table_free(struct mm_struct *, unsigned long *); void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); void page_table_free_pgste(struct page *page); extern int page_table_allocate_pgste; static inline void crst_table_init(unsigned long *crst, unsigned long entry) { memset64((u64 *)crst, entry, _CRST_ENTRIES); } static inline unsigned long pgd_entry_type(struct mm_struct *mm) { if (mm_pmd_folded(mm)) return _SEGMENT_ENTRY_EMPTY; if (mm_pud_folded(mm)) return _REGION3_ENTRY_EMPTY; if (mm_p4d_folded(mm)) return _REGION2_ENTRY_EMPTY; return _REGION1_ENTRY_EMPTY; } int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); void crst_table_downgrade(struct mm_struct *); static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address) { unsigned long *table = crst_table_alloc(mm); if (table) crst_table_init(table, _REGION2_ENTRY_EMPTY); return (p4d_t *) table; } static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) { if (!mm_p4d_folded(mm)) crst_table_free(mm, (unsigned long *) p4d); } static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) { unsigned long *table = crst_table_alloc(mm); if (table) crst_table_init(table, _REGION3_ENTRY_EMPTY); return (pud_t *) table; } static inline void pud_free(struct mm_struct *mm, pud_t *pud) { if (!mm_pud_folded(mm)) crst_table_free(mm, (unsigned long *) pud); } static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) { unsigned long *table = crst_table_alloc(mm); if (!table) return NULL; crst_table_init(table, _SEGMENT_ENTRY_EMPTY); if (!pgtable_pmd_page_ctor(virt_to_page(table))) { crst_table_free(mm, table); return NULL; } return (pmd_t *) table; } static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) { if (mm_pmd_folded(mm)) return; pgtable_pmd_page_dtor(virt_to_page(pmd)); crst_table_free(mm, (unsigned long *) pmd); } static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) { pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d); } static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) { p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud); } static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) { pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); } static inline pgd_t *pgd_alloc(struct mm_struct *mm) { unsigned long *table = crst_table_alloc(mm); if (!table) return NULL; if (mm->context.asce_limit == _REGION3_SIZE) { /* Forking a compat process with 2 page table levels */ if (!pgtable_pmd_page_ctor(virt_to_page(table))) { crst_table_free(mm, table); return NULL; } } return (pgd_t *) table; } static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) { if (mm->context.asce_limit == _REGION3_SIZE) pgtable_pmd_page_dtor(virt_to_page(pgd)); crst_table_free(mm, (unsigned long *) pgd); } static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte) { pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); } #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) #define pmd_pgtable(pmd) \ (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) /* * page table entry allocation/free routines. */ #define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm)) #define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm)) #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) extern void rcu_table_freelist_finish(void); void vmem_map_init(void); void *vmem_crst_alloc(unsigned long val); pte_t *vmem_pte_alloc(void); unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages); void base_asce_free(unsigned long asce); #endif /* _S390_PGALLOC_H */ |