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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 | }; | |
8ff81271 | 19 | extern struct vmemmap_backing *vmemmap_list; |
91eea67c | 20 | |
a0668cdc DG |
21 | /* |
22 | * Functions that deal with pagetables that could be at any level of | |
23 | * the table need to be passed an "index_size" so they know how to | |
24 | * handle allocation. For PTE pages (which are linked to a struct | |
25 | * page for now, and drawn from the main get_free_pages() pool), the | |
26 | * allocation size will be (2^index_size * sizeof(pointer)) and | |
27 | * allocations are drawn from the kmem_cache in PGT_CACHE(index_size). | |
28 | * | |
29 | * The maximum index size needs to be big enough to allow any | |
30 | * pagetable sizes we need, but small enough to fit in the low bits of | |
31 | * any page table pointer. In other words all pagetables, even tiny | |
32 | * ones, must be aligned to allow at least enough low 0 bits to | |
33 | * contain this value. This value is also used as a mask, so it must | |
34 | * be one less than a power of two. | |
35 | */ | |
36 | #define MAX_PGTABLE_INDEX_SIZE 0xf | |
37 | ||
f88df14b | 38 | extern struct kmem_cache *pgtable_cache[]; |
cf9427b8 AK |
39 | #define PGT_CACHE(shift) ({ \ |
40 | BUG_ON(!(shift)); \ | |
41 | pgtable_cache[(shift) - 1]; \ | |
42 | }) | |
f88df14b DG |
43 | |
44 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) | |
45 | { | |
a0668cdc | 46 | return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); |
f88df14b DG |
47 | } |
48 | ||
5e541973 | 49 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
f88df14b | 50 | { |
a0668cdc | 51 | kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); |
f88df14b DG |
52 | } |
53 | ||
54 | #ifndef CONFIG_PPC_64K_PAGES | |
55 | ||
56 | #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD) | |
57 | ||
58 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
59 | { | |
a0668cdc | 60 | return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE), |
f88df14b DG |
61 | GFP_KERNEL|__GFP_REPEAT); |
62 | } | |
63 | ||
5e541973 | 64 | static inline void pud_free(struct mm_struct *mm, pud_t *pud) |
f88df14b | 65 | { |
a0668cdc | 66 | kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); |
f88df14b DG |
67 | } |
68 | ||
69 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
70 | { | |
71 | pud_set(pud, (unsigned long)pmd); | |
72 | } | |
73 | ||
74 | #define pmd_populate(mm, pmd, pte_page) \ | |
75 | pmd_populate_kernel(mm, pmd, page_address(pte_page)) | |
76 | #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte)) | |
2f569afd | 77 | #define pmd_pgtable(pmd) pmd_page(pmd) |
f88df14b | 78 | |
d614bb04 AK |
79 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
80 | unsigned long address) | |
81 | { | |
82 | return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO); | |
83 | } | |
84 | ||
85 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, | |
86 | unsigned long address) | |
87 | { | |
88 | struct page *page; | |
89 | pte_t *pte; | |
90 | ||
91 | pte = pte_alloc_one_kernel(mm, address); | |
92 | if (!pte) | |
93 | return NULL; | |
94 | page = virt_to_page(pte); | |
4f804943 KS |
95 | if (!pgtable_page_ctor(page)) { |
96 | __free_page(page); | |
97 | return NULL; | |
98 | } | |
d614bb04 AK |
99 | return page; |
100 | } | |
101 | ||
102 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
103 | { | |
104 | free_page((unsigned long)pte); | |
105 | } | |
106 | ||
107 | static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) | |
108 | { | |
109 | pgtable_page_dtor(ptepage); | |
110 | __free_page(ptepage); | |
111 | } | |
112 | ||
113 | static inline void pgtable_free(void *table, unsigned index_size) | |
114 | { | |
115 | if (!index_size) | |
116 | free_page((unsigned long)table); | |
117 | else { | |
118 | BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); | |
119 | kmem_cache_free(PGT_CACHE(index_size), table); | |
120 | } | |
121 | } | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | static inline void pgtable_free_tlb(struct mmu_gather *tlb, | |
125 | void *table, int shift) | |
126 | { | |
127 | unsigned long pgf = (unsigned long)table; | |
128 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); | |
129 | pgf |= shift; | |
130 | tlb_remove_table(tlb, (void *)pgf); | |
131 | } | |
132 | ||
133 | static inline void __tlb_remove_table(void *_table) | |
134 | { | |
135 | void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); | |
136 | unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; | |
137 | ||
138 | pgtable_free(table, shift); | |
139 | } | |
140 | #else /* !CONFIG_SMP */ | |
141 | static inline void pgtable_free_tlb(struct mmu_gather *tlb, | |
142 | void *table, int shift) | |
143 | { | |
144 | pgtable_free(table, shift); | |
145 | } | |
146 | #endif /* CONFIG_SMP */ | |
147 | ||
148 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, | |
149 | unsigned long address) | |
150 | { | |
d614bb04 | 151 | tlb_flush_pgtable(tlb, address); |
cf77ee54 HP |
152 | pgtable_page_dtor(table); |
153 | pgtable_free_tlb(tlb, page_address(table), 0); | |
d614bb04 | 154 | } |
f88df14b | 155 | |
d614bb04 | 156 | #else /* if CONFIG_PPC_64K_PAGES */ |
5c1f6ee9 AK |
157 | /* |
158 | * we support 16 fragments per PTE page. | |
159 | */ | |
160 | #define PTE_FRAG_NR 16 | |
161 | /* | |
162 | * We use a 2K PTE page fragment and another 2K for storing | |
163 | * real_pte_t hash index | |
164 | */ | |
165 | #define PTE_FRAG_SIZE_SHIFT 12 | |
166 | #define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) | |
167 | ||
168 | extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int); | |
169 | extern void page_table_free(struct mm_struct *, unsigned long *, int); | |
170 | extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); | |
171 | #ifdef CONFIG_SMP | |
172 | extern void __tlb_remove_table(void *_table); | |
173 | #endif | |
f88df14b DG |
174 | |
175 | #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) | |
176 | ||
177 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, | |
178 | pte_t *pte) | |
179 | { | |
180 | pmd_set(pmd, (unsigned long)pte); | |
181 | } | |
182 | ||
d614bb04 AK |
183 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
184 | pgtable_t pte_page) | |
f88df14b | 185 | { |
5c1f6ee9 | 186 | pmd_set(pmd, (unsigned long)pte_page); |
f88df14b DG |
187 | } |
188 | ||
d614bb04 | 189 | static inline pgtable_t pmd_pgtable(pmd_t pmd) |
f88df14b | 190 | { |
613e60a6 | 191 | return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS); |
f88df14b DG |
192 | } |
193 | ||
194 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, | |
195 | unsigned long address) | |
196 | { | |
5c1f6ee9 | 197 | return (pte_t *)page_table_alloc(mm, address, 1); |
f88df14b DG |
198 | } |
199 | ||
2f569afd | 200 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, |
5c1f6ee9 | 201 | unsigned long address) |
f88df14b | 202 | { |
5c1f6ee9 | 203 | return (pgtable_t)page_table_alloc(mm, address, 0); |
f88df14b DG |
204 | } |
205 | ||
d614bb04 AK |
206 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
207 | { | |
5c1f6ee9 | 208 | page_table_free(mm, (unsigned long *)pte, 1); |
d614bb04 AK |
209 | } |
210 | ||
211 | static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) | |
212 | { | |
5c1f6ee9 | 213 | page_table_free(mm, (unsigned long *)ptepage, 0); |
d614bb04 AK |
214 | } |
215 | ||
d614bb04 AK |
216 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, |
217 | unsigned long address) | |
218 | { | |
d614bb04 | 219 | tlb_flush_pgtable(tlb, address); |
5c1f6ee9 | 220 | pgtable_free_tlb(tlb, table, 0); |
d614bb04 | 221 | } |
d614bb04 AK |
222 | #endif /* CONFIG_PPC_64K_PAGES */ |
223 | ||
224 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
225 | { | |
f940f528 | 226 | return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), |
d614bb04 AK |
227 | GFP_KERNEL|__GFP_REPEAT); |
228 | } | |
229 | ||
230 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) | |
231 | { | |
f940f528 | 232 | kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); |
d614bb04 AK |
233 | } |
234 | ||
a0668cdc | 235 | #define __pmd_free_tlb(tlb, pmd, addr) \ |
f940f528 | 236 | pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX) |
f88df14b | 237 | #ifndef CONFIG_PPC_64K_PAGES |
9e1b32ca | 238 | #define __pud_free_tlb(tlb, pud, addr) \ |
a0668cdc DG |
239 | pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) |
240 | ||
f88df14b DG |
241 | #endif /* CONFIG_PPC_64K_PAGES */ |
242 | ||
243 | #define check_pgt_cache() do { } while (0) | |
244 | ||
245 | #endif /* _ASM_POWERPC_PGALLOC_64_H */ |