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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
22unsigned long *crst_table_alloc(struct mm_struct *);
23void crst_table_free(struct mm_struct *, unsigned long *);
24
25unsigned long *page_table_alloc(struct mm_struct *);
26struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm);
27void page_table_free(struct mm_struct *, unsigned long *);
28void page_table_free_pgste(struct ptdesc *ptdesc);
29extern int page_table_allocate_pgste;
30
31static inline void crst_table_init(unsigned long *crst, unsigned long entry)
32{
33 memset64((u64 *)crst, entry, _CRST_ENTRIES);
34}
35
36int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
37
38static 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
52static 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 return NULL;
58 crst_table_init(table, _REGION2_ENTRY_EMPTY);
59 pagetable_p4d_ctor(virt_to_ptdesc(table));
60
61 return (p4d_t *) table;
62}
63
64static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
65{
66 if (mm_p4d_folded(mm))
67 return;
68
69 pagetable_dtor(virt_to_ptdesc(p4d));
70 crst_table_free(mm, (unsigned long *) p4d);
71}
72
73static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
74{
75 unsigned long *table = crst_table_alloc(mm);
76
77 if (!table)
78 return NULL;
79 crst_table_init(table, _REGION3_ENTRY_EMPTY);
80 pagetable_pud_ctor(virt_to_ptdesc(table));
81
82 return (pud_t *) table;
83}
84
85static inline void pud_free(struct mm_struct *mm, pud_t *pud)
86{
87 if (mm_pud_folded(mm))
88 return;
89
90 pagetable_dtor(virt_to_ptdesc(pud));
91 crst_table_free(mm, (unsigned long *) pud);
92}
93
94static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
95{
96 unsigned long *table = crst_table_alloc(mm);
97
98 if (!table)
99 return NULL;
100 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
101 if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {
102 crst_table_free(mm, table);
103 return NULL;
104 }
105 return (pmd_t *) table;
106}
107
108static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
109{
110 if (mm_pmd_folded(mm))
111 return;
112 pagetable_dtor(virt_to_ptdesc(pmd));
113 crst_table_free(mm, (unsigned long *) pmd);
114}
115
116static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
117{
118 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
119}
120
121static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
122{
123 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
124}
125
126static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
127{
128 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
129}
130
131static inline pgd_t *pgd_alloc(struct mm_struct *mm)
132{
133 unsigned long *table = crst_table_alloc(mm);
134
135 if (!table)
136 return NULL;
137 pagetable_pgd_ctor(virt_to_ptdesc(table));
138
139 return (pgd_t *) table;
140}
141
142static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
143{
144 pagetable_dtor(virt_to_ptdesc(pgd));
145 crst_table_free(mm, (unsigned long *) pgd);
146}
147
148static inline void pmd_populate(struct mm_struct *mm,
149 pmd_t *pmd, pgtable_t pte)
150{
151 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
152}
153
154#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
155
156/*
157 * page table entry allocation/free routines.
158 */
159#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
160#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
161
162#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
163#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
164
165/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
166#define pte_free_defer pte_free_defer
167void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
168
169void vmem_map_init(void);
170void *vmem_crst_alloc(unsigned long val);
171pte_t *vmem_pte_alloc(void);
172
173unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
174void base_asce_free(unsigned long asce);
175
176#endif /* _S390_PGALLOC_H */