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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_noprof(struct mm_struct *);
23#define crst_table_alloc(...) alloc_hooks(crst_table_alloc_noprof(__VA_ARGS__))
24void crst_table_free(struct mm_struct *, unsigned long *);
25
26unsigned long *page_table_alloc_noprof(struct mm_struct *);
27#define page_table_alloc(...) alloc_hooks(page_table_alloc_noprof(__VA_ARGS__))
28void page_table_free(struct mm_struct *, unsigned long *);
29
30struct ptdesc *page_table_alloc_pgste_noprof(struct mm_struct *mm);
31#define page_table_alloc_pgste(...) alloc_hooks(page_table_alloc_pgste_noprof(__VA_ARGS__))
32void page_table_free_pgste(struct ptdesc *ptdesc);
33
34static inline void crst_table_init(unsigned long *crst, unsigned long entry)
35{
36 memset64((u64 *)crst, entry, _CRST_ENTRIES);
37}
38
39int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
40
41static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
42 unsigned long len)
43{
44 int rc;
45
46 if (addr + len > mm->context.asce_limit &&
47 addr + len <= TASK_SIZE) {
48 rc = crst_table_upgrade(mm, addr + len);
49 if (rc)
50 return (unsigned long) rc;
51 }
52 return addr;
53}
54
55static inline p4d_t *p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long address)
56{
57 unsigned long *table = crst_table_alloc_noprof(mm);
58
59 if (!table)
60 return NULL;
61 crst_table_init(table, _REGION2_ENTRY_EMPTY);
62 pagetable_p4d_ctor(virt_to_ptdesc(table));
63
64 return (p4d_t *) table;
65}
66#define p4d_alloc_one(...) alloc_hooks(p4d_alloc_one_noprof(__VA_ARGS__))
67
68static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
69{
70 if (mm_p4d_folded(mm))
71 return;
72
73 pagetable_dtor(virt_to_ptdesc(p4d));
74 crst_table_free(mm, (unsigned long *) p4d);
75}
76
77static inline pud_t *pud_alloc_one_noprof(struct mm_struct *mm, unsigned long address)
78{
79 unsigned long *table = crst_table_alloc_noprof(mm);
80
81 if (!table)
82 return NULL;
83 crst_table_init(table, _REGION3_ENTRY_EMPTY);
84 pagetable_pud_ctor(virt_to_ptdesc(table));
85
86 return (pud_t *) table;
87}
88#define pud_alloc_one(...) alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
89
90static inline void pud_free(struct mm_struct *mm, pud_t *pud)
91{
92 if (mm_pud_folded(mm))
93 return;
94
95 pagetable_dtor(virt_to_ptdesc(pud));
96 crst_table_free(mm, (unsigned long *) pud);
97}
98
99static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long vmaddr)
100{
101 unsigned long *table = crst_table_alloc_noprof(mm);
102
103 if (!table)
104 return NULL;
105 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
106 if (!pagetable_pmd_ctor(mm, virt_to_ptdesc(table))) {
107 crst_table_free(mm, table);
108 return NULL;
109 }
110 return (pmd_t *) table;
111}
112#define pmd_alloc_one(...) alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
113
114static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
115{
116 if (mm_pmd_folded(mm))
117 return;
118 pagetable_dtor(virt_to_ptdesc(pmd));
119 crst_table_free(mm, (unsigned long *) pmd);
120}
121
122static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
123{
124 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
125}
126
127static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
128{
129 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
130}
131
132static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
133{
134 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
135}
136
137static inline pgd_t *pgd_alloc_noprof(struct mm_struct *mm)
138{
139 unsigned long *table = crst_table_alloc_noprof(mm);
140
141 if (!table)
142 return NULL;
143 pagetable_pgd_ctor(virt_to_ptdesc(table));
144
145 return (pgd_t *) table;
146}
147#define pgd_alloc(...) alloc_hooks(pgd_alloc_noprof(__VA_ARGS__))
148
149static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
150{
151 pagetable_dtor(virt_to_ptdesc(pgd));
152 crst_table_free(mm, (unsigned long *) pgd);
153}
154
155static inline void pmd_populate(struct mm_struct *mm,
156 pmd_t *pmd, pgtable_t pte)
157{
158 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
159}
160
161#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
162
163/*
164 * page table entry allocation/free routines.
165 */
166#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
167#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
168
169#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
170#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
171
172/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
173#define pte_free_defer pte_free_defer
174void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
175
176void vmem_map_init(void);
177void *vmem_crst_alloc(unsigned long val);
178pte_t *vmem_pte_alloc(void);
179
180unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
181void base_asce_free(unsigned long asce);
182
183#endif /* _S390_PGALLOC_H */
184

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source code of linux/arch/s390/include/asm/pgalloc.h