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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 pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);
107}
108
109static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
110{
111 p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);
112}
113
114static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115{
116 pud_val(*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 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
133}
134
135#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
136
137
138
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
154
