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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 page *page_table_alloc_pgste(struct mm_struct *mm);
27void page_table_free(struct mm_struct *, unsigned long *);
28void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
29void page_table_free_pgste(struct page *page);
30extern int page_table_allocate_pgste;
31
32static inline void crst_table_init(unsigned long *crst, unsigned long entry)
33{
34 memset64((u64 *)crst, entry, _CRST_ENTRIES);
35}
36
37int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
38
39static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
40 unsigned long len)
41{
42 int rc;
43
44 if (addr + len > mm->context.asce_limit &&
45 addr + len <= TASK_SIZE) {
46 rc = crst_table_upgrade(mm, addr + len);
47 if (rc)
48 return (unsigned long) rc;
49 }
50 return addr;
51}
52
53static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
54{
55 unsigned long *table = crst_table_alloc(mm);
56
57 if (table)
58 crst_table_init(table, _REGION2_ENTRY_EMPTY);
59 return (p4d_t *) table;
60}
61
62static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
63{
64 if (!mm_p4d_folded(mm))
65 crst_table_free(mm, (unsigned long *) p4d);
66}
67
68static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
69{
70 unsigned long *table = crst_table_alloc(mm);
71 if (table)
72 crst_table_init(table, _REGION3_ENTRY_EMPTY);
73 return (pud_t *) table;
74}
75
76static inline void pud_free(struct mm_struct *mm, pud_t *pud)
77{
78 if (!mm_pud_folded(mm))
79 crst_table_free(mm, (unsigned long *) pud);
80}
81
82static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
83{
84 unsigned long *table = crst_table_alloc(mm);
85
86 if (!table)
87 return NULL;
88 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
89 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
90 crst_table_free(mm, table);
91 return NULL;
92 }
93 return (pmd_t *) table;
94}
95
96static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
97{
98 if (mm_pmd_folded(mm))
99 return;
100 pgtable_pmd_page_dtor(virt_to_page(pmd));
101 crst_table_free(mm, (unsigned long *) pmd);
102}
103
104static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
105{
106 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
107}
108
109static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
110{
111 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
112}
113
114static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115{
116 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
117}
118
119static inline pgd_t *pgd_alloc(struct mm_struct *mm)
120{
121 return (pgd_t *) crst_table_alloc(mm);
122}
123
124static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
125{
126 crst_table_free(mm, (unsigned long *) pgd);
127}
128
129static inline void pmd_populate(struct mm_struct *mm,
130 pmd_t *pmd, pgtable_t pte)
131{
132 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
133}
134
135#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
136
137/*
138 * page table entry allocation/free routines.
139 */
140#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
141#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
142
143#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
144#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
145
146void vmem_map_init(void);
147void *vmem_crst_alloc(unsigned long val);
148pte_t *vmem_pte_alloc(void);
149
150unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
151void base_asce_free(unsigned long asce);
152
153#endif /* _S390_PGALLOC_H */
1/*
2 * include/asm-s390/pgalloc.h
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "include/asm-i386/pgalloc.h"
10 * Copyright (C) 1994 Linus Torvalds
11 */
12
13#ifndef _S390_PGALLOC_H
14#define _S390_PGALLOC_H
15
16#include <linux/threads.h>
17#include <linux/gfp.h>
18#include <linux/mm.h>
19
20unsigned long *crst_table_alloc(struct mm_struct *);
21void crst_table_free(struct mm_struct *, unsigned long *);
22
23unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
24void page_table_free(struct mm_struct *, unsigned long *);
25void page_table_free_rcu(struct mmu_gather *, unsigned long *);
26
27static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
28{
29 typedef struct { char _[n]; } addrtype;
30
31 *s = val;
32 n = (n / 256) - 1;
33 asm volatile(
34#ifdef CONFIG_64BIT
35 " mvc 8(248,%0),0(%0)\n"
36#else
37 " mvc 4(252,%0),0(%0)\n"
38#endif
39 "0: mvc 256(256,%0),0(%0)\n"
40 " la %0,256(%0)\n"
41 " brct %1,0b\n"
42 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
43 : "m" (*(addrtype *) s));
44}
45
46static inline void crst_table_init(unsigned long *crst, unsigned long entry)
47{
48 clear_table(crst, entry, sizeof(unsigned long)*2048);
49}
50
51#ifndef CONFIG_64BIT
52
53static inline unsigned long pgd_entry_type(struct mm_struct *mm)
54{
55 return _SEGMENT_ENTRY_EMPTY;
56}
57
58#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
59#define pud_free(mm, x) do { } while (0)
60
61#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
62#define pmd_free(mm, x) do { } while (0)
63
64#define pgd_populate(mm, pgd, pud) BUG()
65#define pud_populate(mm, pud, pmd) BUG()
66
67#else /* CONFIG_64BIT */
68
69static inline unsigned long pgd_entry_type(struct mm_struct *mm)
70{
71 if (mm->context.asce_limit <= (1UL << 31))
72 return _SEGMENT_ENTRY_EMPTY;
73 if (mm->context.asce_limit <= (1UL << 42))
74 return _REGION3_ENTRY_EMPTY;
75 return _REGION2_ENTRY_EMPTY;
76}
77
78int crst_table_upgrade(struct mm_struct *, unsigned long limit);
79void crst_table_downgrade(struct mm_struct *, unsigned long limit);
80
81static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
82{
83 unsigned long *table = crst_table_alloc(mm);
84 if (table)
85 crst_table_init(table, _REGION3_ENTRY_EMPTY);
86 return (pud_t *) table;
87}
88#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
89
90static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
91{
92 unsigned long *table = crst_table_alloc(mm);
93 if (table)
94 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
95 return (pmd_t *) table;
96}
97#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
98
99static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
100{
101 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
102}
103
104static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
105{
106 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
107}
108
109#endif /* CONFIG_64BIT */
110
111static inline pgd_t *pgd_alloc(struct mm_struct *mm)
112{
113 spin_lock_init(&mm->context.list_lock);
114 INIT_LIST_HEAD(&mm->context.pgtable_list);
115 INIT_LIST_HEAD(&mm->context.gmap_list);
116 return (pgd_t *) crst_table_alloc(mm);
117}
118#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
119
120static inline void pmd_populate(struct mm_struct *mm,
121 pmd_t *pmd, pgtable_t pte)
122{
123 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
124}
125
126#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
127
128#define pmd_pgtable(pmd) \
129 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
130
131/*
132 * page table entry allocation/free routines.
133 */
134#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
135#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
136
137#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
138#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
139
140extern void rcu_table_freelist_finish(void);
141
142#endif /* _S390_PGALLOC_H */