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75a9b8a6 AK |
1 | #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H |
2 | #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H | |
101ad5c6 AK |
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 | ||
10 | #include <linux/slab.h> | |
11 | #include <linux/cpumask.h> | |
12 | #include <linux/percpu.h> | |
13 | ||
14 | struct vmemmap_backing { | |
15 | struct vmemmap_backing *list; | |
16 | unsigned long phys; | |
17 | unsigned long virt_addr; | |
18 | }; | |
19 | extern struct vmemmap_backing *vmemmap_list; | |
20 | ||
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 | ||
38 | extern struct kmem_cache *pgtable_cache[]; | |
39 | #define PGT_CACHE(shift) ({ \ | |
40 | BUG_ON(!(shift)); \ | |
41 | pgtable_cache[(shift) - 1]; \ | |
42 | }) | |
43 | ||
2379a23e | 44 | #define PGALLOC_GFP GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO |
934828ed AK |
45 | |
46 | extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int); | |
47 | extern void pte_fragment_free(unsigned long *, int); | |
48 | extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); | |
49 | #ifdef CONFIG_SMP | |
50 | extern void __tlb_remove_table(void *_table); | |
51 | #endif | |
52 | ||
a2f41eb9 AK |
53 | static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm) |
54 | { | |
55 | #ifdef CONFIG_PPC_64K_PAGES | |
56 | return (pgd_t *)__get_free_page(PGALLOC_GFP); | |
57 | #else | |
58 | struct page *page; | |
2379a23e | 59 | page = alloc_pages(PGALLOC_GFP | __GFP_REPEAT, 4); |
a2f41eb9 AK |
60 | if (!page) |
61 | return NULL; | |
62 | return (pgd_t *) page_address(page); | |
63 | #endif | |
64 | } | |
65 | ||
66 | static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
67 | { | |
68 | #ifdef CONFIG_PPC_64K_PAGES | |
69 | free_page((unsigned long)pgd); | |
70 | #else | |
71 | free_pages((unsigned long)pgd, 4); | |
72 | #endif | |
73 | } | |
74 | ||
101ad5c6 AK |
75 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
76 | { | |
a2f41eb9 AK |
77 | if (radix_enabled()) |
78 | return radix__pgd_alloc(mm); | |
101ad5c6 AK |
79 | return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); |
80 | } | |
81 | ||
82 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
83 | { | |
a2f41eb9 AK |
84 | if (radix_enabled()) |
85 | return radix__pgd_free(mm, pgd); | |
101ad5c6 AK |
86 | kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); |
87 | } | |
88 | ||
75a9b8a6 AK |
89 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) |
90 | { | |
a2f41eb9 | 91 | pgd_set(pgd, __pgtable_ptr_val(pud) | PGD_VAL_BITS); |
75a9b8a6 | 92 | } |
101ad5c6 AK |
93 | |
94 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
95 | { | |
2379a23e | 96 | return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE), GFP_KERNEL); |
101ad5c6 AK |
97 | } |
98 | ||
99 | static inline void pud_free(struct mm_struct *mm, pud_t *pud) | |
100 | { | |
101 | kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); | |
102 | } | |
103 | ||
104 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
105 | { | |
a2f41eb9 | 106 | pud_set(pud, __pgtable_ptr_val(pmd) | PUD_VAL_BITS); |
101ad5c6 AK |
107 | } |
108 | ||
934828ed AK |
109 | static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, |
110 | unsigned long address) | |
111 | { | |
a145abf1 AK |
112 | /* |
113 | * By now all the pud entries should be none entries. So go | |
114 | * ahead and flush the page walk cache | |
115 | */ | |
116 | flush_tlb_pgtable(tlb, address); | |
934828ed AK |
117 | pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE); |
118 | } | |
119 | ||
120 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
121 | { | |
2379a23e | 122 | return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), GFP_KERNEL); |
934828ed AK |
123 | } |
124 | ||
125 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) | |
126 | { | |
127 | kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); | |
128 | } | |
129 | ||
130 | static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, | |
131 | unsigned long address) | |
132 | { | |
a145abf1 AK |
133 | /* |
134 | * By now all the pud entries should be none entries. So go | |
135 | * ahead and flush the page walk cache | |
136 | */ | |
137 | flush_tlb_pgtable(tlb, address); | |
934828ed AK |
138 | return pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX); |
139 | } | |
140 | ||
101ad5c6 AK |
141 | static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, |
142 | pte_t *pte) | |
143 | { | |
a2f41eb9 | 144 | pmd_set(pmd, __pgtable_ptr_val(pte) | PMD_VAL_BITS); |
101ad5c6 | 145 | } |
934828ed | 146 | |
101ad5c6 AK |
147 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
148 | pgtable_t pte_page) | |
149 | { | |
a2f41eb9 | 150 | pmd_set(pmd, __pgtable_ptr_val(pte_page) | PMD_VAL_BITS); |
101ad5c6 AK |
151 | } |
152 | ||
75a9b8a6 AK |
153 | static inline pgtable_t pmd_pgtable(pmd_t pmd) |
154 | { | |
934828ed | 155 | return (pgtable_t)pmd_page_vaddr(pmd); |
75a9b8a6 | 156 | } |
101ad5c6 | 157 | |
934828ed | 158 | #ifdef CONFIG_PPC_4K_PAGES |
101ad5c6 AK |
159 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
160 | unsigned long address) | |
161 | { | |
32d6bd90 | 162 | return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); |
101ad5c6 AK |
163 | } |
164 | ||
165 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, | |
166 | unsigned long address) | |
167 | { | |
168 | struct page *page; | |
169 | pte_t *pte; | |
170 | ||
171 | pte = pte_alloc_one_kernel(mm, address); | |
172 | if (!pte) | |
173 | return NULL; | |
174 | page = virt_to_page(pte); | |
175 | if (!pgtable_page_ctor(page)) { | |
176 | __free_page(page); | |
177 | return NULL; | |
178 | } | |
934828ed | 179 | return pte; |
101ad5c6 | 180 | } |
101ad5c6 AK |
181 | #else /* if CONFIG_PPC_64K_PAGES */ |
182 | ||
101ad5c6 AK |
183 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
184 | unsigned long address) | |
185 | { | |
74701d59 | 186 | return (pte_t *)pte_fragment_alloc(mm, address, 1); |
101ad5c6 AK |
187 | } |
188 | ||
189 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, | |
934828ed | 190 | unsigned long address) |
101ad5c6 | 191 | { |
74701d59 | 192 | return (pgtable_t)pte_fragment_alloc(mm, address, 0); |
101ad5c6 | 193 | } |
934828ed | 194 | #endif |
101ad5c6 AK |
195 | |
196 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
197 | { | |
74701d59 | 198 | pte_fragment_free((unsigned long *)pte, 1); |
101ad5c6 AK |
199 | } |
200 | ||
201 | static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) | |
202 | { | |
74701d59 | 203 | pte_fragment_free((unsigned long *)ptepage, 0); |
101ad5c6 AK |
204 | } |
205 | ||
206 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, | |
207 | unsigned long address) | |
208 | { | |
a145abf1 AK |
209 | /* |
210 | * By now all the pud entries should be none entries. So go | |
211 | * ahead and flush the page walk cache | |
212 | */ | |
213 | flush_tlb_pgtable(tlb, address); | |
101ad5c6 AK |
214 | pgtable_free_tlb(tlb, table, 0); |
215 | } | |
101ad5c6 AK |
216 | |
217 | #define check_pgt_cache() do { } while (0) | |
218 | ||
75a9b8a6 | 219 | #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */ |