Linux kernel mirror (for testing)
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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/mm.h>
11#include <linux/slab.h>
12#include <linux/cpumask.h>
13#include <linux/percpu.h>
14
15#ifndef CONFIG_PPC_SUBPAGE_PROT
16static inline void subpage_prot_free(pgd_t *pgd) {}
17#endif
18
19extern struct kmem_cache *pgtable_cache[];
20
21#define PGD_CACHE_NUM 0
22#define PUD_CACHE_NUM 1
23#define PMD_CACHE_NUM 1
24#define HUGEPTE_CACHE_NUM 2
25#define PTE_NONCACHE_NUM 3 /* from GFP rather than kmem_cache */
26
27static inline pgd_t *pgd_alloc(struct mm_struct *mm)
28{
29 return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
30}
31
32static inline void pgd_free(pgd_t *pgd)
33{
34 subpage_prot_free(pgd);
35 kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
36}
37
38#ifndef CONFIG_PPC_64K_PAGES
39
40#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, PUD)
41
42static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
43{
44 return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
45 GFP_KERNEL|__GFP_REPEAT);
46}
47
48static inline void pud_free(pud_t *pud)
49{
50 kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
51}
52
53static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
54{
55 pud_set(pud, (unsigned long)pmd);
56}
57
58#define pmd_populate(mm, pmd, pte_page) \
59 pmd_populate_kernel(mm, pmd, page_address(pte_page))
60#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
61
62
63#else /* CONFIG_PPC_64K_PAGES */
64
65#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
66
67static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
68 pte_t *pte)
69{
70 pmd_set(pmd, (unsigned long)pte);
71}
72
73#define pmd_populate(mm, pmd, pte_page) \
74 pmd_populate_kernel(mm, pmd, page_address(pte_page))
75
76#endif /* CONFIG_PPC_64K_PAGES */
77
78static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
79{
80 return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
81 GFP_KERNEL|__GFP_REPEAT);
82}
83
84static inline void pmd_free(pmd_t *pmd)
85{
86 kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
87}
88
89static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
90 unsigned long address)
91{
92 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
93}
94
95static inline struct page *pte_alloc_one(struct mm_struct *mm,
96 unsigned long address)
97{
98 pte_t *pte = pte_alloc_one_kernel(mm, address);
99 return pte ? virt_to_page(pte) : NULL;
100}
101
102static inline void pte_free_kernel(pte_t *pte)
103{
104 free_page((unsigned long)pte);
105}
106
107static inline void pte_free(struct page *ptepage)
108{
109 __free_page(ptepage);
110}
111
112#define PGF_CACHENUM_MASK 0x3
113
114typedef struct pgtable_free {
115 unsigned long val;
116} pgtable_free_t;
117
118static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
119 unsigned long mask)
120{
121 BUG_ON(cachenum > PGF_CACHENUM_MASK);
122
123 return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
124}
125
126static inline void pgtable_free(pgtable_free_t pgf)
127{
128 void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
129 int cachenum = pgf.val & PGF_CACHENUM_MASK;
130
131 if (cachenum == PTE_NONCACHE_NUM)
132 free_page((unsigned long)p);
133 else
134 kmem_cache_free(pgtable_cache[cachenum], p);
135}
136
137extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
138
139#define __pte_free_tlb(tlb, ptepage) \
140 pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
141 PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1))
142#define __pmd_free_tlb(tlb, pmd) \
143 pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
144 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
145#ifndef CONFIG_PPC_64K_PAGES
146#define __pud_free_tlb(tlb, pud) \
147 pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
148 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
149#endif /* CONFIG_PPC_64K_PAGES */
150
151#define check_pgt_cache() do { } while (0)
152
153#endif /* _ASM_POWERPC_PGALLOC_64_H */