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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
10#include <linux/slab.h>
11#include <linux/cpumask.h>
12#include <linux/percpu.h>
13
14/*
15 * Functions that deal with pagetables that could be at any level of
16 * the table need to be passed an "index_size" so they know how to
17 * handle allocation. For PTE pages (which are linked to a struct
18 * page for now, and drawn from the main get_free_pages() pool), the
19 * allocation size will be (2^index_size * sizeof(pointer)) and
20 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
21 *
22 * The maximum index size needs to be big enough to allow any
23 * pagetable sizes we need, but small enough to fit in the low bits of
24 * any page table pointer. In other words all pagetables, even tiny
25 * ones, must be aligned to allow at least enough low 0 bits to
26 * contain this value. This value is also used as a mask, so it must
27 * be one less than a power of two.
28 */
29#define MAX_PGTABLE_INDEX_SIZE 0xf
30
31extern struct kmem_cache *pgtable_cache[];
32#define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
33
34static inline pgd_t *pgd_alloc(struct mm_struct *mm)
35{
36 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
37}
38
39static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
40{
41 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
42}
43
44#ifndef CONFIG_PPC_64K_PAGES
45
46#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD)
47
48static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
49{
50 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
51 GFP_KERNEL|__GFP_REPEAT);
52}
53
54static inline void pud_free(struct mm_struct *mm, pud_t *pud)
55{
56 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
57}
58
59static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
60{
61 pud_set(pud, (unsigned long)pmd);
62}
63
64#define pmd_populate(mm, pmd, pte_page) \
65 pmd_populate_kernel(mm, pmd, page_address(pte_page))
66#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
67#define pmd_pgtable(pmd) pmd_page(pmd)
68
69
70#else /* CONFIG_PPC_64K_PAGES */
71
72#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
73
74static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
75 pte_t *pte)
76{
77 pmd_set(pmd, (unsigned long)pte);
78}
79
80#define pmd_populate(mm, pmd, pte_page) \
81 pmd_populate_kernel(mm, pmd, page_address(pte_page))
82#define pmd_pgtable(pmd) pmd_page(pmd)
83
84#endif /* CONFIG_PPC_64K_PAGES */
85
86static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
87{
88 return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE),
89 GFP_KERNEL|__GFP_REPEAT);
90}
91
92static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
93{
94 kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd);
95}
96
97static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
98 unsigned long address)
99{
100 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
101}
102
103static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
104 unsigned long address)
105{
106 struct page *page;
107 pte_t *pte;
108
109 pte = pte_alloc_one_kernel(mm, address);
110 if (!pte)
111 return NULL;
112 page = virt_to_page(pte);
113 pgtable_page_ctor(page);
114 return page;
115}
116
117static inline void pgtable_free(void *table, unsigned index_size)
118{
119 if (!index_size)
120 free_page((unsigned long)table);
121 else {
122 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
123 kmem_cache_free(PGT_CACHE(index_size), table);
124 }
125}
126
127#define __pmd_free_tlb(tlb, pmd, addr) \
128 pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE)
129#ifndef CONFIG_PPC_64K_PAGES
130#define __pud_free_tlb(tlb, pud, addr) \
131 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
132
133#endif /* CONFIG_PPC_64K_PAGES */
134
135#define check_pgt_cache() do { } while (0)
136
137#endif /* _ASM_POWERPC_PGALLOC_64_H */