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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 ([email protected])
6 * Martin Schwidefsky ([email protected])
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
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_noprof(struct mm_struct *mm, unsigned long address)
52{
53 unsigned long *table = crst_table_alloc_noprof(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#define p4d_alloc_one(...) alloc_hooks(p4d_alloc_one_noprof(__VA_ARGS__))
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_noprof(struct mm_struct *mm, unsigned long address)
74{
75 unsigned long *table = crst_table_alloc_noprof(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#define pud_alloc_one(...) alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
85
86static inline void pud_free(struct mm_struct *mm, pud_t *pud)
87{
88 if (mm_pud_folded(mm))
89 return;
90
91 pagetable_dtor(virt_to_ptdesc(pud));
92 crst_table_free(mm, (unsigned long *) pud);
93}
94
95static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long vmaddr)
96{
97 unsigned long *table = crst_table_alloc_noprof(mm);
98
99 if (!table)
100 return NULL;
101 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
102 if (!pagetable_pmd_ctor(mm, virt_to_ptdesc(table))) {
103 crst_table_free(mm, table);
104 return NULL;
105 }
106 return (pmd_t *) table;
107}
108#define pmd_alloc_one(...) alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
109
110static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
111{
112 if (mm_pmd_folded(mm))
113 return;
114 pagetable_dtor(virt_to_ptdesc(pmd));
115 crst_table_free(mm, (unsigned long *) pmd);
116}
117
118static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
119{
120 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
121}
122
123static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
124{
125 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
126}
127
128static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
129{
130 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
131}
132
133static inline pgd_t *pgd_alloc_noprof(struct mm_struct *mm)
134{
135 unsigned long *table = crst_table_alloc_noprof(mm);
136
137 if (!table)
138 return NULL;
139 pagetable_pgd_ctor(virt_to_ptdesc(table));
140
141 return (pgd_t *) table;
142}
143#define pgd_alloc(...) alloc_hooks(pgd_alloc_noprof(__VA_ARGS__))
144
145static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
146{
147 pagetable_dtor(virt_to_ptdesc(pgd));
148 crst_table_free(mm, (unsigned long *) pgd);
149}
150
151static inline void pmd_populate(struct mm_struct *mm,
152 pmd_t *pmd, pgtable_t pte)
153{
154 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
155}
156
157#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
158
159/*
160 * page table entry allocation/free routines.
161 */
162#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
163#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
164
165#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
166#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
167
168/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
169#define pte_free_defer pte_free_defer
170void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
171
172void vmem_map_init(void);
173void *vmem_crst_alloc(unsigned long val);
174pte_t *vmem_pte_alloc(void);
175
176unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
177void base_asce_free(unsigned long asce);
178
179#endif /* _S390_PGALLOC_H */