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_rcu(struct mmu_gather *, unsigned long *, unsigned long);
29 void page_table_free_pgste(struct page *page);
30 extern int page_table_allocate_pgste;
31
crst_table_init(unsigned long * crst,unsigned long entry)32 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
33 {
34 memset64((u64 *)crst, entry, _CRST_ENTRIES);
35 }
36
37 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
38
check_asce_limit(struct mm_struct * mm,unsigned long addr,unsigned long len)39 static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
40 unsigned long len)
41 {
42 int rc;
43
44 if (addr + len > mm->context.asce_limit &&
45 addr + len <= TASK_SIZE) {
46 rc = crst_table_upgrade(mm, addr + len);
47 if (rc)
48 return (unsigned long) rc;
49 }
50 return addr;
51 }
52
p4d_alloc_one(struct mm_struct * mm,unsigned long address)53 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
54 {
55 unsigned long *table = crst_table_alloc(mm);
56
57 if (table)
58 crst_table_init(table, _REGION2_ENTRY_EMPTY);
59 return (p4d_t *) table;
60 }
61
p4d_free(struct mm_struct * mm,p4d_t * p4d)62 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
63 {
64 if (!mm_p4d_folded(mm))
65 crst_table_free(mm, (unsigned long *) p4d);
66 }
67
pud_alloc_one(struct mm_struct * mm,unsigned long address)68 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
69 {
70 unsigned long *table = crst_table_alloc(mm);
71 if (table)
72 crst_table_init(table, _REGION3_ENTRY_EMPTY);
73 return (pud_t *) table;
74 }
75
pud_free(struct mm_struct * mm,pud_t * pud)76 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
77 {
78 if (!mm_pud_folded(mm))
79 crst_table_free(mm, (unsigned long *) pud);
80 }
81
pmd_alloc_one(struct mm_struct * mm,unsigned long vmaddr)82 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
83 {
84 unsigned long *table = crst_table_alloc(mm);
85
86 if (!table)
87 return NULL;
88 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
89 if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {
90 crst_table_free(mm, table);
91 return NULL;
92 }
93 return (pmd_t *) table;
94 }
95
pmd_free(struct mm_struct * mm,pmd_t * pmd)96 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
97 {
98 if (mm_pmd_folded(mm))
99 return;
100 pagetable_pmd_dtor(virt_to_ptdesc(pmd));
101 crst_table_free(mm, (unsigned long *) pmd);
102 }
103
pgd_populate(struct mm_struct * mm,pgd_t * pgd,p4d_t * p4d)104 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
105 {
106 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
107 }
108
p4d_populate(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)109 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
110 {
111 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
112 }
113
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)114 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115 {
116 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
117 }
118
pgd_alloc(struct mm_struct * mm)119 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
120 {
121 return (pgd_t *) crst_table_alloc(mm);
122 }
123
pgd_free(struct mm_struct * mm,pgd_t * pgd)124 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
125 {
126 crst_table_free(mm, (unsigned long *) pgd);
127 }
128
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)129 static inline void pmd_populate(struct mm_struct *mm,
130 pmd_t *pmd, pgtable_t pte)
131 {
132 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
133 }
134
135 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
136
137 /*
138 * page table entry allocation/free routines.
139 */
140 #define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
141 #define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
142
143 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
144 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
145
146 /* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
147 #define pte_free_defer pte_free_defer
148 void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
149
150 void vmem_map_init(void);
151 void *vmem_crst_alloc(unsigned long val);
152 pte_t *vmem_pte_alloc(void);
153
154 unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
155 void base_asce_free(unsigned long asce);
156
157 #endif /* _S390_PGALLOC_H */
158
