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f88df14b DG |
1 | #ifndef _ASM_POWERPC_PGALLOC_64_H |
2 | #define _ASM_POWERPC_PGALLOC_64_H | |
3 | /* | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
f88df14b DG |
10 | #include <linux/slab.h> |
11 | #include <linux/cpumask.h> | |
12 | #include <linux/percpu.h> | |
13 | ||
91eea67c MN |
14 | struct vmemmap_backing { |
15 | struct vmemmap_backing *list; | |
16 | unsigned long phys; | |
17 | unsigned long virt_addr; | |
18 | }; | |
19 | ||
a0668cdc DG |
20 | /* |
21 | * Functions that deal with pagetables that could be at any level of | |
22 | * the table need to be passed an "index_size" so they know how to | |
23 | * handle allocation. For PTE pages (which are linked to a struct | |
24 | * page for now, and drawn from the main get_free_pages() pool), the | |
25 | * allocation size will be (2^index_size * sizeof(pointer)) and | |
26 | * allocations are drawn from the kmem_cache in PGT_CACHE(index_size). | |
27 | * | |
28 | * The maximum index size needs to be big enough to allow any | |
29 | * pagetable sizes we need, but small enough to fit in the low bits of | |
30 | * any page table pointer. In other words all pagetables, even tiny | |
31 | * ones, must be aligned to allow at least enough low 0 bits to | |
32 | * contain this value. This value is also used as a mask, so it must | |
33 | * be one less than a power of two. | |
34 | */ | |
35 | #define MAX_PGTABLE_INDEX_SIZE 0xf | |
36 | ||
f88df14b | 37 | extern struct kmem_cache *pgtable_cache[]; |
cf9427b8 AK |
38 | #define PGT_CACHE(shift) ({ \ |
39 | BUG_ON(!(shift)); \ | |
40 | pgtable_cache[(shift) - 1]; \ | |
41 | }) | |
f88df14b DG |
42 | |
43 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) | |
44 | { | |
a0668cdc | 45 | return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); |
f88df14b DG |
46 | } |
47 | ||
5e541973 | 48 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
f88df14b | 49 | { |
a0668cdc | 50 | kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); |
f88df14b DG |
51 | } |
52 | ||
53 | #ifndef CONFIG_PPC_64K_PAGES | |
54 | ||
55 | #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD) | |
56 | ||
57 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
58 | { | |
a0668cdc | 59 | return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE), |
f88df14b DG |
60 | GFP_KERNEL|__GFP_REPEAT); |
61 | } | |
62 | ||
5e541973 | 63 | static inline void pud_free(struct mm_struct *mm, pud_t *pud) |
f88df14b | 64 | { |
a0668cdc | 65 | kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); |
f88df14b DG |
66 | } |
67 | ||
68 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
69 | { | |
70 | pud_set(pud, (unsigned long)pmd); | |
71 | } | |
72 | ||
73 | #define pmd_populate(mm, pmd, pte_page) \ | |
74 | pmd_populate_kernel(mm, pmd, page_address(pte_page)) | |
75 | #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte)) | |
2f569afd | 76 | #define pmd_pgtable(pmd) pmd_page(pmd) |
f88df14b | 77 | |
d614bb04 AK |
78 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
79 | unsigned long address) | |
80 | { | |
81 | return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO); | |
82 | } | |
83 | ||
84 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, | |
85 | unsigned long address) | |
86 | { | |
87 | struct page *page; | |
88 | pte_t *pte; | |
89 | ||
90 | pte = pte_alloc_one_kernel(mm, address); | |
91 | if (!pte) | |
92 | return NULL; | |
93 | page = virt_to_page(pte); | |
4f804943 KS |
94 | if (!pgtable_page_ctor(page)) { |
95 | __free_page(page); | |
96 | return NULL; | |
97 | } | |
d614bb04 AK |
98 | return page; |
99 | } | |
100 | ||
101 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
102 | { | |
103 | free_page((unsigned long)pte); | |
104 | } | |
105 | ||
106 | static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) | |
107 | { | |
108 | pgtable_page_dtor(ptepage); | |
109 | __free_page(ptepage); | |
110 | } | |
111 | ||
112 | static inline void pgtable_free(void *table, unsigned index_size) | |
113 | { | |
114 | if (!index_size) | |
115 | free_page((unsigned long)table); | |
116 | else { | |
117 | BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); | |
118 | kmem_cache_free(PGT_CACHE(index_size), table); | |
119 | } | |
120 | } | |
121 | ||
122 | #ifdef CONFIG_SMP | |
123 | static inline void pgtable_free_tlb(struct mmu_gather *tlb, | |
124 | void *table, int shift) | |
125 | { | |
126 | unsigned long pgf = (unsigned long)table; | |
127 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); | |
128 | pgf |= shift; | |
129 | tlb_remove_table(tlb, (void *)pgf); | |
130 | } | |
131 | ||
132 | static inline void __tlb_remove_table(void *_table) | |
133 | { | |
134 | void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); | |
135 | unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; | |
136 | ||
137 | pgtable_free(table, shift); | |
138 | } | |
139 | #else /* !CONFIG_SMP */ | |
140 | static inline void pgtable_free_tlb(struct mmu_gather *tlb, | |
141 | void *table, int shift) | |
142 | { | |
143 | pgtable_free(table, shift); | |
144 | } | |
145 | #endif /* CONFIG_SMP */ | |
146 | ||
147 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, | |
148 | unsigned long address) | |
149 | { | |
150 | struct page *page = page_address(table); | |
151 | ||
152 | tlb_flush_pgtable(tlb, address); | |
153 | pgtable_page_dtor(page); | |
154 | pgtable_free_tlb(tlb, page, 0); | |
155 | } | |
f88df14b | 156 | |
d614bb04 | 157 | #else /* if CONFIG_PPC_64K_PAGES */ |
5c1f6ee9 AK |
158 | /* |
159 | * we support 16 fragments per PTE page. | |
160 | */ | |
161 | #define PTE_FRAG_NR 16 | |
162 | /* | |
163 | * We use a 2K PTE page fragment and another 2K for storing | |
164 | * real_pte_t hash index | |
165 | */ | |
166 | #define PTE_FRAG_SIZE_SHIFT 12 | |
167 | #define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) | |
168 | ||
169 | extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int); | |
170 | extern void page_table_free(struct mm_struct *, unsigned long *, int); | |
171 | extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); | |
172 | #ifdef CONFIG_SMP | |
173 | extern void __tlb_remove_table(void *_table); | |
174 | #endif | |
f88df14b DG |
175 | |
176 | #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) | |
177 | ||
178 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, | |
179 | pte_t *pte) | |
180 | { | |
181 | pmd_set(pmd, (unsigned long)pte); | |
182 | } | |
183 | ||
d614bb04 AK |
184 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
185 | pgtable_t pte_page) | |
f88df14b | 186 | { |
5c1f6ee9 | 187 | pmd_set(pmd, (unsigned long)pte_page); |
f88df14b DG |
188 | } |
189 | ||
d614bb04 | 190 | static inline pgtable_t pmd_pgtable(pmd_t pmd) |
f88df14b | 191 | { |
613e60a6 | 192 | return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS); |
f88df14b DG |
193 | } |
194 | ||
195 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, | |
196 | unsigned long address) | |
197 | { | |
5c1f6ee9 | 198 | return (pte_t *)page_table_alloc(mm, address, 1); |
f88df14b DG |
199 | } |
200 | ||
2f569afd | 201 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, |
5c1f6ee9 | 202 | unsigned long address) |
f88df14b | 203 | { |
5c1f6ee9 | 204 | return (pgtable_t)page_table_alloc(mm, address, 0); |
f88df14b DG |
205 | } |
206 | ||
d614bb04 AK |
207 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
208 | { | |
5c1f6ee9 | 209 | page_table_free(mm, (unsigned long *)pte, 1); |
d614bb04 AK |
210 | } |
211 | ||
212 | static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) | |
213 | { | |
5c1f6ee9 | 214 | page_table_free(mm, (unsigned long *)ptepage, 0); |
d614bb04 AK |
215 | } |
216 | ||
d614bb04 AK |
217 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, |
218 | unsigned long address) | |
219 | { | |
d614bb04 | 220 | tlb_flush_pgtable(tlb, address); |
5c1f6ee9 | 221 | pgtable_free_tlb(tlb, table, 0); |
d614bb04 | 222 | } |
d614bb04 AK |
223 | #endif /* CONFIG_PPC_64K_PAGES */ |
224 | ||
225 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
226 | { | |
f940f528 | 227 | return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), |
d614bb04 AK |
228 | GFP_KERNEL|__GFP_REPEAT); |
229 | } | |
230 | ||
231 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) | |
232 | { | |
f940f528 | 233 | kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); |
d614bb04 AK |
234 | } |
235 | ||
a0668cdc | 236 | #define __pmd_free_tlb(tlb, pmd, addr) \ |
f940f528 | 237 | pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX) |
f88df14b | 238 | #ifndef CONFIG_PPC_64K_PAGES |
9e1b32ca | 239 | #define __pud_free_tlb(tlb, pud, addr) \ |
a0668cdc DG |
240 | pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) |
241 | ||
f88df14b DG |
242 | #endif /* CONFIG_PPC_64K_PAGES */ |
243 | ||
244 | #define check_pgt_cache() do { } while (0) | |
245 | ||
246 | #endif /* _ASM_POWERPC_PGALLOC_64_H */ |