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),
47 pgtable_gfp_flags(mm, GFP_KERNEL));
50 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
52 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
55 #ifndef CONFIG_PPC_64K_PAGES
57 #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD)
59 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
61 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
62 pgtable_gfp_flags(mm, GFP_KERNEL));
65 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
67 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
70 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
72 pud_set(pud, (unsigned long)pmd);
75 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
78 pmd_set(pmd, (unsigned long)pte);
81 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
84 pmd_set(pmd, (unsigned long)page_address(pte_page));
87 #define pmd_pgtable(pmd) pmd_page(pmd)
89 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
90 unsigned long address)
92 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
95 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
96 unsigned long address)
101 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
104 page = virt_to_page(pte);
105 if (!pgtable_page_ctor(page)) {
112 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
114 free_page((unsigned long)pte);
117 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
119 pgtable_page_dtor(ptepage);
120 __free_page(ptepage);
123 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
125 extern void __tlb_remove_table(void *_table);
127 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
128 unsigned long address)
130 tlb_flush_pgtable(tlb, address);
131 pgtable_free_tlb(tlb, page_address(table), 0);
134 #else /* if CONFIG_PPC_64K_PAGES */
136 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int);
137 extern void pte_fragment_free(unsigned long *, int);
138 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
140 extern void __tlb_remove_table(void *_table);
143 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
145 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
148 pmd_set(pmd, (unsigned long)pte);
151 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
154 pmd_set(pmd, (unsigned long)pte_page);
157 static inline pgtable_t pmd_pgtable(pmd_t pmd)
159 return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
162 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
163 unsigned long address)
165 return (pte_t *)pte_fragment_alloc(mm, address, 1);
168 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
169 unsigned long address)
171 return (pgtable_t)pte_fragment_alloc(mm, address, 0);
174 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
176 pte_fragment_free((unsigned long *)pte, 1);
179 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
181 pte_fragment_free((unsigned long *)ptepage, 0);
184 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
185 unsigned long address)
187 tlb_flush_pgtable(tlb, address);
188 pgtable_free_tlb(tlb, table, 0);
190 #endif /* CONFIG_PPC_64K_PAGES */
192 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
194 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
195 pgtable_gfp_flags(mm, GFP_KERNEL));
198 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
200 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
203 #define __pmd_free_tlb(tlb, pmd, addr) \
204 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
205 #ifndef CONFIG_PPC_64K_PAGES
206 #define __pud_free_tlb(tlb, pud, addr) \
207 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
209 #endif /* CONFIG_PPC_64K_PAGES */
211 #define check_pgt_cache() do { } while (0)
213 #endif /* _ASM_POWERPC_PGALLOC_64_H */