summaryrefslogtreecommitdiffstats
path: root/arch/s390/include/asm/pgalloc.h
blob: 376b4b23bdaa349dff7065b8b64295302b046c09 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/pgalloc.h"
 *    Copyright (C) 1994  Linus Torvalds
 */

#ifndef _S390_PGALLOC_H
#define _S390_PGALLOC_H

#include <linux/threads.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/mm.h>

#define CRST_ALLOC_ORDER 2

unsigned long *crst_table_alloc(struct mm_struct *);
void crst_table_free(struct mm_struct *, unsigned long *);

unsigned long *page_table_alloc(struct mm_struct *);
struct page *page_table_alloc_pgste(struct mm_struct *mm);
void page_table_free(struct mm_struct *, unsigned long *);
void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
void page_table_free_pgste(struct page *page);
extern int page_table_allocate_pgste;

static inline void crst_table_init(unsigned long *crst, unsigned long entry)
{
	memset64((u64 *)crst, entry, _CRST_ENTRIES);
}

int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);

static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
					     unsigned long len)
{
	int rc;

	if (addr + len > mm->context.asce_limit &&
	    addr + len <= TASK_SIZE) {
		rc = crst_table_upgrade(mm, addr + len);
		if (rc)
			return (unsigned long) rc;
	}
	return addr;
}

static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
{
	unsigned long *table = crst_table_alloc(mm);

	if (table)
		crst_table_init(table, _REGION2_ENTRY_EMPTY);
	return (p4d_t *) table;
}

static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	if (!mm_p4d_folded(mm))
		crst_table_free(mm, (unsigned long *) p4d);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
{
	unsigned long *table = crst_table_alloc(mm);
	if (table)
		crst_table_init(table, _REGION3_ENTRY_EMPTY);
	return (pud_t *) table;
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	if (!mm_pud_folded(mm))
		crst_table_free(mm, (unsigned long *) pud);
}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
	unsigned long *table = crst_table_alloc(mm);

	if (!table)
		return NULL;
	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {
		crst_table_free(mm, table);
		return NULL;
	}
	return (pmd_t *) table;
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	if (mm_pmd_folded(mm))
		return;
	pagetable_pmd_dtor(virt_to_ptdesc(pmd));
	crst_table_free(mm, (unsigned long *) pmd);
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
	set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
}

static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
	set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return (pgd_t *) crst_table_alloc(mm);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	crst_table_free(mm, (unsigned long *) pgd);
}

static inline void pmd_populate(struct mm_struct *mm,
				pmd_t *pmd, pgtable_t pte)
{
	set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
}

#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)

/*
 * page table entry allocation/free routines.
 */
#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))

#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)

/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
#define pte_free_defer pte_free_defer
void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);

void vmem_map_init(void);
void *vmem_crst_alloc(unsigned long val);
pte_t *vmem_pte_alloc(void);

unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
void base_asce_free(unsigned long asce);

#endif /* _S390_PGALLOC_H */