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) pgtable_cache[shift]
41 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
43 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
44 pgtable_gfp_flags(mm, GFP_KERNEL));
47 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
49 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
52 #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD)
54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
56 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
57 pgtable_gfp_flags(mm, GFP_KERNEL));
60 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
62 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
65 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
67 pud_set(pud, (unsigned long)pmd);
70 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
73 pmd_set(pmd, (unsigned long)pte);
76 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
79 pmd_set(pmd, (unsigned long)page_address(pte_page));
82 #define pmd_pgtable(pmd) pmd_page(pmd)
84 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
86 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
87 pgtable_gfp_flags(mm, GFP_KERNEL));
90 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
92 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
96 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
98 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
101 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
106 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
109 page = virt_to_page(pte);
110 if (!pgtable_page_ctor(page)) {
117 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
119 free_page((unsigned long)pte);
122 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
124 pgtable_page_dtor(ptepage);
125 __free_page(ptepage);
128 static inline void pgtable_free(void *table, int shift)
131 pgtable_page_dtor(virt_to_page(table));
132 free_page((unsigned long)table);
134 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
135 kmem_cache_free(PGT_CACHE(shift), table);
139 #define get_hugepd_cache_index(x) (x)
141 static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
143 unsigned long pgf = (unsigned long)table;
145 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
147 tlb_remove_table(tlb, (void *)pgf);
150 static inline void __tlb_remove_table(void *_table)
152 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
153 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
155 pgtable_free(table, shift);
159 static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
161 pgtable_free(table, shift);
165 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
166 unsigned long address)
168 tlb_flush_pgtable(tlb, address);
169 pgtable_free_tlb(tlb, page_address(table), 0);
172 #define __pmd_free_tlb(tlb, pmd, addr) \
173 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
174 #ifndef CONFIG_PPC_64K_PAGES
175 #define __pud_free_tlb(tlb, pud, addr) \
176 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
178 #endif /* CONFIG_PPC_64K_PAGES */
180 #define check_pgt_cache() do { } while (0)
182 #endif /* _ASM_POWERPC_PGALLOC_64_H */