Linux kernel mirror (for testing)
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linux
1#ifndef _ASM_X86_PGALLOC_H
2#define _ASM_X86_PGALLOC_H
3
4#include <linux/threads.h>
5#include <linux/mm.h> /* for struct page */
6#include <linux/pagemap.h>
7
8static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
9
10#ifdef CONFIG_PARAVIRT
11#include <asm/paravirt.h>
12#else
13#define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
14static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
15static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
16static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
17static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
18 unsigned long start, unsigned long count) {}
19static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
20static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
21static inline void paravirt_release_pte(unsigned long pfn) {}
22static inline void paravirt_release_pmd(unsigned long pfn) {}
23static inline void paravirt_release_pud(unsigned long pfn) {}
24static inline void paravirt_release_p4d(unsigned long pfn) {}
25#endif
26
27/*
28 * Flags to use when allocating a user page table page.
29 */
30extern gfp_t __userpte_alloc_gfp;
31
32/*
33 * Allocate and free page tables.
34 */
35extern pgd_t *pgd_alloc(struct mm_struct *);
36extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
37
38extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
39extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
40
41/* Should really implement gc for free page table pages. This could be
42 done with a reference count in struct page. */
43
44static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
45{
46 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
47 free_page((unsigned long)pte);
48}
49
50static inline void pte_free(struct mm_struct *mm, struct page *pte)
51{
52 pgtable_page_dtor(pte);
53 __free_page(pte);
54}
55
56extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
57
58static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
59 unsigned long address)
60{
61 ___pte_free_tlb(tlb, pte);
62}
63
64static inline void pmd_populate_kernel(struct mm_struct *mm,
65 pmd_t *pmd, pte_t *pte)
66{
67 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
68 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
69}
70
71static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
72 struct page *pte)
73{
74 unsigned long pfn = page_to_pfn(pte);
75
76 paravirt_alloc_pte(mm, pfn);
77 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
78}
79
80#define pmd_pgtable(pmd) pmd_page(pmd)
81
82#if CONFIG_PGTABLE_LEVELS > 2
83static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
84{
85 struct page *page;
86 gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
87
88 if (mm == &init_mm)
89 gfp &= ~__GFP_ACCOUNT;
90 page = alloc_pages(gfp, 0);
91 if (!page)
92 return NULL;
93 if (!pgtable_pmd_page_ctor(page)) {
94 __free_pages(page, 0);
95 return NULL;
96 }
97 return (pmd_t *)page_address(page);
98}
99
100static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
101{
102 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
103 pgtable_pmd_page_dtor(virt_to_page(pmd));
104 free_page((unsigned long)pmd);
105}
106
107extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
108
109static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
110 unsigned long address)
111{
112 ___pmd_free_tlb(tlb, pmd);
113}
114
115#ifdef CONFIG_X86_PAE
116extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
117#else /* !CONFIG_X86_PAE */
118static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
119{
120 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
121 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
122}
123#endif /* CONFIG_X86_PAE */
124
125#if CONFIG_PGTABLE_LEVELS > 3
126static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
127{
128 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
129 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
130}
131
132static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
133{
134 gfp_t gfp = GFP_KERNEL_ACCOUNT;
135
136 if (mm == &init_mm)
137 gfp &= ~__GFP_ACCOUNT;
138 return (pud_t *)get_zeroed_page(gfp);
139}
140
141static inline void pud_free(struct mm_struct *mm, pud_t *pud)
142{
143 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
144 free_page((unsigned long)pud);
145}
146
147extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
148
149static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
150 unsigned long address)
151{
152 ___pud_free_tlb(tlb, pud);
153}
154
155#if CONFIG_PGTABLE_LEVELS > 4
156static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
157{
158 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
159 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
160}
161
162static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
163{
164 gfp_t gfp = GFP_KERNEL_ACCOUNT;
165
166 if (mm == &init_mm)
167 gfp &= ~__GFP_ACCOUNT;
168 return (p4d_t *)get_zeroed_page(gfp);
169}
170
171static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
172{
173 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
174 free_page((unsigned long)p4d);
175}
176
177extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
178
179static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
180 unsigned long address)
181{
182 ___p4d_free_tlb(tlb, p4d);
183}
184
185#endif /* CONFIG_PGTABLE_LEVELS > 4 */
186#endif /* CONFIG_PGTABLE_LEVELS > 3 */
187#endif /* CONFIG_PGTABLE_LEVELS > 2 */
188
189#endif /* _ASM_X86_PGALLOC_H */