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[mirror_ubuntu-bionic-kernel.git] / arch / s390 / include / asm / pgalloc.h
1 /*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2000
4 * Author(s): Hartmut Penner (hp@de.ibm.com)
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "include/asm-i386/pgalloc.h"
8 * Copyright (C) 1994 Linus Torvalds
9 */
10
11 #ifndef _S390_PGALLOC_H
12 #define _S390_PGALLOC_H
13
14 #include <linux/threads.h>
15 #include <linux/gfp.h>
16 #include <linux/mm.h>
17
18 unsigned long *crst_table_alloc(struct mm_struct *);
19 void crst_table_free(struct mm_struct *, unsigned long *);
20
21 unsigned long *page_table_alloc(struct mm_struct *);
22 void page_table_free(struct mm_struct *, unsigned long *);
23 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
24
25 void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long,
26 bool init_skey);
27 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
28 unsigned long key, bool nq);
29 unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr);
30
31 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
32 {
33 typedef struct { char _[n]; } addrtype;
34
35 *s = val;
36 n = (n / 256) - 1;
37 asm volatile(
38 #ifdef CONFIG_64BIT
39 " mvc 8(248,%0),0(%0)\n"
40 #else
41 " mvc 4(252,%0),0(%0)\n"
42 #endif
43 "0: mvc 256(256,%0),0(%0)\n"
44 " la %0,256(%0)\n"
45 " brct %1,0b\n"
46 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
47 : "m" (*(addrtype *) s));
48 }
49
50 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
51 {
52 clear_table(crst, entry, sizeof(unsigned long)*2048);
53 }
54
55 #ifndef CONFIG_64BIT
56
57 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
58 {
59 return _SEGMENT_ENTRY_EMPTY;
60 }
61
62 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
63 #define pud_free(mm, x) do { } while (0)
64
65 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
66 #define pmd_free(mm, x) do { } while (0)
67
68 #define pgd_populate(mm, pgd, pud) BUG()
69 #define pud_populate(mm, pud, pmd) BUG()
70
71 #else /* CONFIG_64BIT */
72
73 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
74 {
75 if (mm->context.asce_limit <= (1UL << 31))
76 return _SEGMENT_ENTRY_EMPTY;
77 if (mm->context.asce_limit <= (1UL << 42))
78 return _REGION3_ENTRY_EMPTY;
79 return _REGION2_ENTRY_EMPTY;
80 }
81
82 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
83 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
84
85 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
86 {
87 unsigned long *table = crst_table_alloc(mm);
88 if (table)
89 crst_table_init(table, _REGION3_ENTRY_EMPTY);
90 return (pud_t *) table;
91 }
92 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
93
94 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
95 {
96 unsigned long *table = crst_table_alloc(mm);
97
98 if (!table)
99 return NULL;
100 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
101 if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
102 crst_table_free(mm, table);
103 return NULL;
104 }
105 return (pmd_t *) table;
106 }
107
108 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
109 {
110 pgtable_pmd_page_dtor(virt_to_page(pmd));
111 crst_table_free(mm, (unsigned long *) pmd);
112 }
113
114 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
115 {
116 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
117 }
118
119 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
120 {
121 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
122 }
123
124 #endif /* CONFIG_64BIT */
125
126 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
127 {
128 spin_lock_init(&mm->context.list_lock);
129 INIT_LIST_HEAD(&mm->context.pgtable_list);
130 INIT_LIST_HEAD(&mm->context.gmap_list);
131 return (pgd_t *) crst_table_alloc(mm);
132 }
133 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
134
135 static inline void pmd_populate(struct mm_struct *mm,
136 pmd_t *pmd, pgtable_t pte)
137 {
138 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
139 }
140
141 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
142
143 #define pmd_pgtable(pmd) \
144 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
145
146 /*
147 * page table entry allocation/free routines.
148 */
149 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
150 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
151
152 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
153 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
154
155 extern void rcu_table_freelist_finish(void);
156
157 #endif /* _S390_PGALLOC_H */