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 struct vmemmap_backing {
15 struct vmemmap_backing *list;
16 unsigned long phys;
17 unsigned long virt_addr;
18 };
19
20 /*
21 * Functions that deal with pagetables that could be at any level of
22 * the table need to be passed an "index_size" so they know how to
23 * handle allocation. For PTE pages (which are linked to a struct
24 * page for now, and drawn from the main get_free_pages() pool), the
25 * allocation size will be (2^index_size * sizeof(pointer)) and
26 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
27 *
28 * The maximum index size needs to be big enough to allow any
29 * pagetable sizes we need, but small enough to fit in the low bits of
30 * any page table pointer. In other words all pagetables, even tiny
31 * ones, must be aligned to allow at least enough low 0 bits to
32 * contain this value. This value is also used as a mask, so it must
33 * be one less than a power of two.
34 */
35 #define MAX_PGTABLE_INDEX_SIZE 0xf
36
37 extern struct kmem_cache *pgtable_cache[];
38 #define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
39
pgd_alloc(struct mm_struct * mm)40 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
41 {
42 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
43 }
44
pgd_free(struct mm_struct * mm,pgd_t * pgd)45 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
46 {
47 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
48 }
49
50 #ifndef CONFIG_PPC_64K_PAGES
51
52 #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD)
53
pud_alloc_one(struct mm_struct * mm,unsigned long addr)54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
55 {
56 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
57 GFP_KERNEL|__GFP_REPEAT);
58 }
59
pud_free(struct mm_struct * mm,pud_t * pud)60 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
61 {
62 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
63 }
64
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)65 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
66 {
67 pud_set(pud, (unsigned long)pmd);
68 }
69
70 #define pmd_populate(mm, pmd, pte_page) \
71 pmd_populate_kernel(mm, pmd, page_address(pte_page))
72 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
73 #define pmd_pgtable(pmd) pmd_page(pmd)
74
75
76 #else /* CONFIG_PPC_64K_PAGES */
77
78 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
79
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)80 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
81 pte_t *pte)
82 {
83 pmd_set(pmd, (unsigned long)pte);
84 }
85
86 #define pmd_populate(mm, pmd, pte_page) \
87 pmd_populate_kernel(mm, pmd, page_address(pte_page))
88 #define pmd_pgtable(pmd) pmd_page(pmd)
89
90 #endif /* CONFIG_PPC_64K_PAGES */
91
pmd_alloc_one(struct mm_struct * mm,unsigned long addr)92 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
93 {
94 return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE),
95 GFP_KERNEL|__GFP_REPEAT);
96 }
97
pmd_free(struct mm_struct * mm,pmd_t * pmd)98 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
99 {
100 kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd);
101 }
102
pte_alloc_one_kernel(struct mm_struct * mm,unsigned long address)103 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
104 unsigned long address)
105 {
106 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
107 }
108
pte_alloc_one(struct mm_struct * mm,unsigned long address)109 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
110 unsigned long address)
111 {
112 struct page *page;
113 pte_t *pte;
114
115 pte = pte_alloc_one_kernel(mm, address);
116 if (!pte)
117 return NULL;
118 page = virt_to_page(pte);
119 pgtable_page_ctor(page);
120 return page;
121 }
122
pgtable_free(void * table,unsigned index_size)123 static inline void pgtable_free(void *table, unsigned index_size)
124 {
125 if (!index_size)
126 free_page((unsigned long)table);
127 else {
128 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
129 kmem_cache_free(PGT_CACHE(index_size), table);
130 }
131 }
132
133 #define __pmd_free_tlb(tlb, pmd, addr) \
134 pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE)
135 #ifndef CONFIG_PPC_64K_PAGES
136 #define __pud_free_tlb(tlb, pud, addr) \
137 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
138
139 #endif /* CONFIG_PPC_64K_PAGES */
140
141 #define check_pgt_cache() do { } while (0)
142
143 #endif /* _ASM_POWERPC_PGALLOC_64_H */
144