Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PGALLOC_H
3#define _ASM_X86_PGALLOC_H
4
5#include <linux/threads.h>
6#include <linux/mm.h> /* for struct page */
7#include <linux/pagemap.h>
8
9static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
10
11#ifdef CONFIG_PARAVIRT
12#include <asm/paravirt.h>
13#else
14#define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
15static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
16static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
17static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
18static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
19 unsigned long start, unsigned long count) {}
20static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
21static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
22static inline void paravirt_release_pte(unsigned long pfn) {}
23static inline void paravirt_release_pmd(unsigned long pfn) {}
24static inline void paravirt_release_pud(unsigned long pfn) {}
25static inline void paravirt_release_p4d(unsigned long pfn) {}
26#endif
27
28/*
29 * Flags to use when allocating a user page table page.
30 */
31extern gfp_t __userpte_alloc_gfp;
32
33/*
34 * Allocate and free page tables.
35 */
36extern pgd_t *pgd_alloc(struct mm_struct *);
37extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
38
39extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
40extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
41
42/* Should really implement gc for free page table pages. This could be
43 done with a reference count in struct page. */
44
45static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
46{
47 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
48 free_page((unsigned long)pte);
49}
50
51static inline void pte_free(struct mm_struct *mm, struct page *pte)
52{
53 pgtable_page_dtor(pte);
54 __free_page(pte);
55}
56
57extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
58
59static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
60 unsigned long address)
61{
62 ___pte_free_tlb(tlb, pte);
63}
64
65static inline void pmd_populate_kernel(struct mm_struct *mm,
66 pmd_t *pmd, pte_t *pte)
67{
68 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
69 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
70}
71
72static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
73 struct page *pte)
74{
75 unsigned long pfn = page_to_pfn(pte);
76
77 paravirt_alloc_pte(mm, pfn);
78 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
79}
80
81#define pmd_pgtable(pmd) pmd_page(pmd)
82
83#if CONFIG_PGTABLE_LEVELS > 2
84static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
85{
86 struct page *page;
87 gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
88
89 if (mm == &init_mm)
90 gfp &= ~__GFP_ACCOUNT;
91 page = alloc_pages(gfp, 0);
92 if (!page)
93 return NULL;
94 if (!pgtable_pmd_page_ctor(page)) {
95 __free_pages(page, 0);
96 return NULL;
97 }
98 return (pmd_t *)page_address(page);
99}
100
101static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
102{
103 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
104 pgtable_pmd_page_dtor(virt_to_page(pmd));
105 free_page((unsigned long)pmd);
106}
107
108extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
109
110static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
111 unsigned long address)
112{
113 ___pmd_free_tlb(tlb, pmd);
114}
115
116#ifdef CONFIG_X86_PAE
117extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
118#else /* !CONFIG_X86_PAE */
119static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
120{
121 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
122 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
123}
124#endif /* CONFIG_X86_PAE */
125
126#if CONFIG_PGTABLE_LEVELS > 3
127static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
128{
129 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
130 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
131}
132
133static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
134{
135 gfp_t gfp = GFP_KERNEL_ACCOUNT;
136
137 if (mm == &init_mm)
138 gfp &= ~__GFP_ACCOUNT;
139 return (pud_t *)get_zeroed_page(gfp);
140}
141
142static inline void pud_free(struct mm_struct *mm, pud_t *pud)
143{
144 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
145 free_page((unsigned long)pud);
146}
147
148extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
149
150static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
151 unsigned long address)
152{
153 ___pud_free_tlb(tlb, pud);
154}
155
156#if CONFIG_PGTABLE_LEVELS > 4
157static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
158{
159 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
160 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
161}
162
163static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
164{
165 gfp_t gfp = GFP_KERNEL_ACCOUNT;
166
167 if (mm == &init_mm)
168 gfp &= ~__GFP_ACCOUNT;
169 return (p4d_t *)get_zeroed_page(gfp);
170}
171
172static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
173{
174 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
175 free_page((unsigned long)p4d);
176}
177
178extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
179
180static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
181 unsigned long address)
182{
183 ___p4d_free_tlb(tlb, p4d);
184}
185
186#endif /* CONFIG_PGTABLE_LEVELS > 4 */
187#endif /* CONFIG_PGTABLE_LEVELS > 3 */
188#endif /* CONFIG_PGTABLE_LEVELS > 2 */
189
190#endif /* _ASM_X86_PGALLOC_H */