1 #ifndef _ASM_POWERPC_PGALLOC_64_H
2 #define _ASM_POWERPC_PGALLOC_64_H
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.
10 #include <linux/slab.h>
11 #include <linux/cpumask.h>
12 #include <linux/percpu.h>
14 struct vmemmap_backing {
15 struct vmemmap_backing *list;
17 unsigned long virt_addr;
19 extern struct vmemmap_backing *vmemmap_list;
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).
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.
36 #define MAX_PGTABLE_INDEX_SIZE 0xf
38 extern struct kmem_cache *pgtable_cache[];
39 #define PGT_CACHE(shift) ({ \
41 pgtable_cache[(shift) - 1]; \
44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
46 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
51 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
54 #ifndef CONFIG_PPC_64K_PAGES
56 #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD)
58 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
60 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
61 GFP_KERNEL|__GFP_REPEAT);
64 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
66 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
69 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
71 pud_set(pud, (unsigned long)pmd);
74 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
77 pmd_set(pmd, (unsigned long)pte);
80 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
83 pmd_set(pmd, (unsigned long)page_address(pte_page));
86 #define pmd_pgtable(pmd) pmd_page(pmd)
88 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
89 unsigned long address)
91 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
94 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
95 unsigned long address)
100 pte = pte_alloc_one_kernel(mm, address);
103 page = virt_to_page(pte);
104 if (!pgtable_page_ctor(page)) {
111 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
113 free_page((unsigned long)pte);
116 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
118 pgtable_page_dtor(ptepage);
119 __free_page(ptepage);
122 static inline void pgtable_free(void *table, unsigned index_size)
125 free_page((unsigned long)table);
127 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
128 kmem_cache_free(PGT_CACHE(index_size), table);
133 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
134 void *table, int shift)
136 unsigned long pgf = (unsigned long)table;
137 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
139 tlb_remove_table(tlb, (void *)pgf);
142 static inline void __tlb_remove_table(void *_table)
144 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
145 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
147 pgtable_free(table, shift);
149 #else /* !CONFIG_SMP */
150 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
151 void *table, int shift)
153 pgtable_free(table, shift);
155 #endif /* CONFIG_SMP */
157 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
158 unsigned long address)
160 tlb_flush_pgtable(tlb, address);
161 pgtable_page_dtor(table);
162 pgtable_free_tlb(tlb, page_address(table), 0);
165 #else /* if CONFIG_PPC_64K_PAGES */
167 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
168 extern void page_table_free(struct mm_struct *, unsigned long *, int);
169 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
171 extern void __tlb_remove_table(void *_table);
174 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
176 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
179 pmd_set(pmd, (unsigned long)pte);
182 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
185 pmd_set(pmd, (unsigned long)pte_page);
188 static inline pgtable_t pmd_pgtable(pmd_t pmd)
190 return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
193 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
194 unsigned long address)
196 return (pte_t *)page_table_alloc(mm, address, 1);
199 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
200 unsigned long address)
202 return (pgtable_t)page_table_alloc(mm, address, 0);
205 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
207 page_table_free(mm, (unsigned long *)pte, 1);
210 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
212 page_table_free(mm, (unsigned long *)ptepage, 0);
215 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
216 unsigned long address)
218 tlb_flush_pgtable(tlb, address);
219 pgtable_free_tlb(tlb, table, 0);
221 #endif /* CONFIG_PPC_64K_PAGES */
223 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
225 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
226 GFP_KERNEL|__GFP_REPEAT);
229 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
231 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
234 #define __pmd_free_tlb(tlb, pmd, addr) \
235 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
236 #ifndef CONFIG_PPC_64K_PAGES
237 #define __pud_free_tlb(tlb, pud, addr) \
238 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
240 #endif /* CONFIG_PPC_64K_PAGES */
242 #define check_pgt_cache() do { } while (0)
244 #endif /* _ASM_POWERPC_PGALLOC_64_H */