summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/book3s/64/pgalloc.h
blob: 138bc2ecc0c4ba51f075a0e8c18d3a69872c9423 (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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
#ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
#define _ASM_POWERPC_BOOK3S_64_PGALLOC_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/slab.h>
#include <linux/cpumask.h>
#include <linux/kmemleak.h>
#include <linux/percpu.h>

struct vmemmap_backing {
	struct vmemmap_backing *list;
	unsigned long phys;
	unsigned long virt_addr;
};
extern struct vmemmap_backing *vmemmap_list;

/*
 * Functions that deal with pagetables that could be at any level of
 * the table need to be passed an "index_size" so they know how to
 * handle allocation.  For PTE pages (which are linked to a struct
 * page for now, and drawn from the main get_free_pages() pool), the
 * allocation size will be (2^index_size * sizeof(pointer)) and
 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
 *
 * The maximum index size needs to be big enough to allow any
 * pagetable sizes we need, but small enough to fit in the low bits of
 * any page table pointer.  In other words all pagetables, even tiny
 * ones, must be aligned to allow at least enough low 0 bits to
 * contain this value.  This value is also used as a mask, so it must
 * be one less than a power of two.
 */
#define MAX_PGTABLE_INDEX_SIZE	0xf

extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) pgtable_cache[shift]

extern pte_t *pte_fragment_alloc(struct mm_struct *, int);
extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
extern void pte_fragment_free(unsigned long *, int);
extern void pmd_fragment_free(unsigned long *);
extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
#ifdef CONFIG_SMP
extern void __tlb_remove_table(void *_table);
#endif
void pte_frag_destroy(void *pte_frag);

static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
{
#ifdef CONFIG_PPC_64K_PAGES
	return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
#else
	struct page *page;
	page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
				4);
	if (!page)
		return NULL;
	return (pgd_t *) page_address(page);
#endif
}

static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifdef CONFIG_PPC_64K_PAGES
	free_page((unsigned long)pgd);
#else
	free_pages((unsigned long)pgd, 4);
#endif
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd;

	if (radix_enabled())
		return radix__pgd_alloc(mm);

	pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
			       pgtable_gfp_flags(mm, GFP_KERNEL));
	/*
	 * Don't scan the PGD for pointers, it contains references to PUDs but
	 * those references are not full pointers and so can't be recognised by
	 * kmemleak.
	 */
	kmemleak_no_scan(pgd);

	/*
	 * With hugetlb, we don't clear the second half of the page table.
	 * If we share the same slab cache with the pmd or pud level table,
	 * we need to make sure we zero out the full table on alloc.
	 * With 4K we don't store slot in the second half. Hence we don't
	 * need to do this for 4k.
	 */
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
	(H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
	memset(pgd, 0, PGD_TABLE_SIZE);
#endif
	return pgd;
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	if (radix_enabled())
		return radix__pgd_free(mm, pgd);
	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
	*pgd =  __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	pud_t *pud;

	pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
			       pgtable_gfp_flags(mm, GFP_KERNEL));
	/*
	 * Tell kmemleak to ignore the PUD, that means don't scan it for
	 * pointers and don't consider it a leak. PUDs are typically only
	 * referred to by their PGD, but kmemleak is not able to recognise those
	 * as pointers, leading to false leak reports.
	 */
	kmemleak_ignore(pud);

	return pud;
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	*pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
}

static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
				  unsigned long address)
{
	/*
	 * By now all the pud entries should be none entries. So go
	 * ahead and flush the page walk cache
	 */
	flush_tlb_pgtable(tlb, address);
	pgtable_free_tlb(tlb, pud, PUD_INDEX);
}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return pmd_fragment_alloc(mm, addr);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	pmd_fragment_free((unsigned long *)pmd);
}

static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
				  unsigned long address)
{
	/*
	 * By now all the pud entries should be none entries. So go
	 * ahead and flush the page walk cache
	 */
	flush_tlb_pgtable(tlb, address);
	return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
}

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
				       pte_t *pte)
{
	*pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				pgtable_t pte_page)
{
	*pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
}

static inline pgtable_t pmd_pgtable(pmd_t pmd)
{
	return (pgtable_t)pmd_page_vaddr(pmd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
	return (pte_t *)pte_fragment_alloc(mm, 1);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
{
	return (pgtable_t)pte_fragment_alloc(mm, 0);
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	pte_fragment_free((unsigned long *)pte, 1);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
	pte_fragment_free((unsigned long *)ptepage, 0);
}

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
				  unsigned long address)
{
	/*
	 * By now all the pud entries should be none entries. So go
	 * ahead and flush the page walk cache
	 */
	flush_tlb_pgtable(tlb, address);
	pgtable_free_tlb(tlb, table, PTE_INDEX);
}

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

extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
static inline void update_page_count(int psize, long count)
{
	if (IS_ENABLED(CONFIG_PROC_FS))
		atomic_long_add(count, &direct_pages_count[psize]);
}

#endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */