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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);
29
30static inline void crst_table_init(unsigned long *crst, unsigned long entry)
31{
32 memset64((u64 *)crst, entry, _CRST_ENTRIES);
33}
34
35int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
36
37static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
38 unsigned long len)
39{
40 int rc;
41
42 if (addr + len > mm->context.asce_limit &&
43 addr + len <= TASK_SIZE) {
44 rc = crst_table_upgrade(mm, addr + len);
45 if (rc)
46 return (unsigned long) rc;
47 }
48 return addr;
49}
50
51static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
52{
53 unsigned long *table = crst_table_alloc(mm);
54
55 if (!table)
56 return NULL;
57 crst_table_init(table, _REGION2_ENTRY_EMPTY);
58 pagetable_p4d_ctor(virt_to_ptdesc(table));
59
60 return (p4d_t *) table;
61}
62
63static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
64{
65 if (mm_p4d_folded(mm))
66 return;
67
68 pagetable_dtor(virt_to_ptdesc(p4d));
69 crst_table_free(mm, (unsigned long *) p4d);
70}
71
72static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
73{
74 unsigned long *table = crst_table_alloc(mm);
75
76 if (!table)
77 return NULL;
78 crst_table_init(table, _REGION3_ENTRY_EMPTY);
79 pagetable_pud_ctor(virt_to_ptdesc(table));
80
81 return (pud_t *) table;
82}
83
84static inline void pud_free(struct mm_struct *mm, pud_t *pud)
85{
86 if (mm_pud_folded(mm))
87 return;
88
89 pagetable_dtor(virt_to_ptdesc(pud));
90 crst_table_free(mm, (unsigned long *) pud);
91}
92
93static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
94{
95 unsigned long *table = crst_table_alloc(mm);
96
97 if (!table)
98 return NULL;
99 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
100 if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {
101 crst_table_free(mm, table);
102 return NULL;
103 }
104 return (pmd_t *) table;
105}
106
107static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
108{
109 if (mm_pmd_folded(mm))
110 return;
111 pagetable_dtor(virt_to_ptdesc(pmd));
112 crst_table_free(mm, (unsigned long *) pmd);
113}
114
115static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
116{
117 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
118}
119
120static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
121{
122 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
123}
124
125static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
126{
127 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
128}
129
130static inline pgd_t *pgd_alloc(struct mm_struct *mm)
131{
132 unsigned long *table = crst_table_alloc(mm);
133
134 if (!table)
135 return NULL;
136 pagetable_pgd_ctor(virt_to_ptdesc(table));
137
138 return (pgd_t *) table;
139}
140
141static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
142{
143 pagetable_dtor(virt_to_ptdesc(pgd));
144 crst_table_free(mm, (unsigned long *) pgd);
145}
146
147static inline void pmd_populate(struct mm_struct *mm,
148 pmd_t *pmd, pgtable_t pte)
149{
150 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
151}
152
153#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
154
155/*
156 * page table entry allocation/free routines.
157 */
158#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
159#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
160
161#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
162#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
163
164/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
165#define pte_free_defer pte_free_defer
166void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
167
168void vmem_map_init(void);
169void *vmem_crst_alloc(unsigned long val);
170pte_t *vmem_pte_alloc(void);
171
172unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
173void base_asce_free(unsigned long asce);
174
175#endif /* _S390_PGALLOC_H */