1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2000 5 * Author(s): Hartmut Penner (hp@de.ibm.com) 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "include/asm-i386/pgalloc.h" 9 * Copyright (C) 1994 Linus Torvalds 10 */ 11 12 #ifndef _S390_PGALLOC_H 13 #define _S390_PGALLOC_H 14 15 #include <linux/threads.h> 16 #include <linux/string.h> 17 #include <linux/gfp.h> 18 #include <linux/mm.h> 19 20 #define CRST_ALLOC_ORDER 2 21 22 unsigned long *crst_table_alloc(struct mm_struct *); 23 void crst_table_free(struct mm_struct *, unsigned long *); 24 25 unsigned long *page_table_alloc(struct mm_struct *); 26 struct page *page_table_alloc_pgste(struct mm_struct *mm); 27 void page_table_free(struct mm_struct *, unsigned long *); 28 void page_table_free_pgste(struct page *page); 29 extern int page_table_allocate_pgste; 30 31 static inline void crst_table_init(unsigned long *crst, unsigned long entry) 32 { 33 memset64((u64 *)crst, entry, _CRST_ENTRIES); 34 } 35 36 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); 37 38 static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr, 39 unsigned long len) 40 { 41 int rc; 42 43 if (addr + len > mm->context.asce_limit && 44 addr + len <= TASK_SIZE) { 45 rc = crst_table_upgrade(mm, addr + len); 46 if (rc) 47 return (unsigned long) rc; 48 } 49 return addr; 50 } 51 52 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address) 53 { 54 unsigned long *table = crst_table_alloc(mm); 55 56 if (table) 57 crst_table_init(table, _REGION2_ENTRY_EMPTY); 58 return (p4d_t *) table; 59 } 60 61 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) 62 { 63 if (!mm_p4d_folded(mm)) 64 crst_table_free(mm, (unsigned long *) p4d); 65 } 66 67 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 68 { 69 unsigned long *table = crst_table_alloc(mm); 70 if (table) 71 crst_table_init(table, _REGION3_ENTRY_EMPTY); 72 return (pud_t *) table; 73 } 74 75 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 76 { 77 if (!mm_pud_folded(mm)) 78 crst_table_free(mm, (unsigned long *) pud); 79 } 80 81 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) 82 { 83 unsigned long *table = crst_table_alloc(mm); 84 85 if (!table) 86 return NULL; 87 crst_table_init(table, _SEGMENT_ENTRY_EMPTY); 88 if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) { 89 crst_table_free(mm, table); 90 return NULL; 91 } 92 return (pmd_t *) table; 93 } 94 95 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 96 { 97 if (mm_pmd_folded(mm)) 98 return; 99 pagetable_pmd_dtor(virt_to_ptdesc(pmd)); 100 crst_table_free(mm, (unsigned long *) pmd); 101 } 102 103 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 104 { 105 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d))); 106 } 107 108 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 109 { 110 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud))); 111 } 112 113 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 114 { 115 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd))); 116 } 117 118 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 119 { 120 return (pgd_t *) crst_table_alloc(mm); 121 } 122 123 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 124 { 125 crst_table_free(mm, (unsigned long *) pgd); 126 } 127 128 static inline void pmd_populate(struct mm_struct *mm, 129 pmd_t *pmd, pgtable_t pte) 130 { 131 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte))); 132 } 133 134 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) 135 136 /* 137 * page table entry allocation/free routines. 138 */ 139 #define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm)) 140 #define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm)) 141 142 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) 143 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) 144 145 /* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */ 146 #define pte_free_defer pte_free_defer 147 void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable); 148 149 void vmem_map_init(void); 150 void *vmem_crst_alloc(unsigned long val); 151 pte_t *vmem_pte_alloc(void); 152 153 unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages); 154 void base_asce_free(unsigned long asce); 155 156 #endif /* _S390_PGALLOC_H */ 157