aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/pgalloc-64.h
blob: 812a1d8f35cbc58f21d9096b3ef00c8678d930f9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
#ifndef _ASM_POWERPC_PGALLOC_64_H
#define _ASM_POWERPC_PGALLOC_64_H
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>

#ifndef CONFIG_PPC_SUBPAGE_PROT
static inline void subpage_prot_free(pgd_t *pgd) {}
#endif

extern struct kmem_cache *pgtable_cache[];

#define PGD_CACHE_NUM		0
#define PUD_CACHE_NUM		1
#define PMD_CACHE_NUM		1
#define HUGEPTE_CACHE_NUM	2
#define PTE_NONCACHE_NUM	7  /* from GFP rather than kmem_cache */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	subpage_prot_free(pgd);
	kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
}

#ifndef CONFIG_PPC_64K_PAGES

#define pgd_populate(MM, PGD, PUD)	pgd_set(PGD, PUD)

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
				GFP_KERNEL|__GFP_REPEAT);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	pud_set(pud, (unsigned long)pmd);
}

#define pmd_populate(mm, pmd, pte_page) \
	pmd_populate_kernel(mm, pmd, page_address(pte_page))
#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
#define pmd_pgtable(pmd) pmd_page(pmd)


#else /* CONFIG_PPC_64K_PAGES */

#define pud_populate(mm, pud, pmd)	pud_set(pud, (unsigned long)pmd)

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
				       pte_t *pte)
{
	pmd_set(pmd, (unsigned long)pte);
}

#define pmd_populate(mm, pmd, pte_page) \
	pmd_populate_kernel(mm, pmd, page_address(pte_page))
#define pmd_pgtable(pmd) pmd_page(pmd)

#endif /* CONFIG_PPC_64K_PAGES */

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
				GFP_KERNEL|__GFP_REPEAT);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
					  unsigned long address)
{
        return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
					unsigned long address)
{
	struct page *page;
	pte_t *pte;

	pte = pte_alloc_one_kernel(mm, address);
	if (!pte)
		return NULL;
	page = virt_to_page(pte);
	pgtable_page_ctor(page);
	return page;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
	pgtable_page_dtor(ptepage);
	__free_page(ptepage);
}

#define PGF_CACHENUM_MASK	0x7

typedef struct pgtable_free {
	unsigned long val;
} pgtable_free_t;

static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
						unsigned long mask)
{
	BUG_ON(cachenum > PGF_CACHENUM_MASK);

	return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
}

static inline void pgtable_free(pgtable_free_t pgf)
{
	void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
	int cachenum = pgf.val & PGF_CACHENUM_MASK;

	if (cachenum == PTE_NONCACHE_NUM)
		free_page((unsigned long)p);
	else
		kmem_cache_free(pgtable_cache[cachenum], p);
}

extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);

#define __pte_free_tlb(tlb,ptepage)	\
do { \
	pgtable_page_dtor(ptepage); \
	pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
		PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
} while (0)
#define __pmd_free_tlb(tlb, pmd) 	\
	pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
		PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
#ifndef CONFIG_PPC_64K_PAGES
#define __pud_free_tlb(tlb, pud)	\
	pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
		PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
#endif /* CONFIG_PPC_64K_PAGES */

#define check_pgt_cache()	do { } while (0)

#endif /* _ASM_POWERPC_PGALLOC_64_H */