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 ptdesc *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 ptdesc *ptdesc);
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
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