Line data Source code
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 :
9 : #define __HAVE_ARCH_PTE_ALLOC_ONE
10 : #define __HAVE_ARCH_PGD_FREE
11 : #include <asm-generic/pgalloc.h>
12 :
13 10325 : static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
14 :
15 : #ifdef CONFIG_PARAVIRT_XXL
16 : #include <asm/paravirt.h>
17 : #else
18 : #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
19 10301 : static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
20 16029 : static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
21 10000 : static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
22 : static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
23 : unsigned long start, unsigned long count) {}
24 7151 : static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
25 : static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
26 39889 : static inline void paravirt_release_pte(unsigned long pfn) {}
27 22771 : static inline void paravirt_release_pmd(unsigned long pfn) {}
28 18410 : static inline void paravirt_release_pud(unsigned long pfn) {}
29 : static inline void paravirt_release_p4d(unsigned long pfn) {}
30 : #endif
31 :
32 : /*
33 : * Flags to use when allocating a user page table page.
34 : */
35 : extern gfp_t __userpte_alloc_gfp;
36 :
37 : #ifdef CONFIG_PAGE_TABLE_ISOLATION
38 : /*
39 : * Instead of one PGD, we acquire two PGDs. Being order-1, it is
40 : * both 8k in size and 8k-aligned. That lets us just flip bit 12
41 : * in a pointer to swap between the two 4k halves.
42 : */
43 : #define PGD_ALLOCATION_ORDER 1
44 : #else
45 : #define PGD_ALLOCATION_ORDER 0
46 : #endif
47 :
48 : /*
49 : * Allocate and free page tables.
50 : */
51 : extern pgd_t *pgd_alloc(struct mm_struct *);
52 : extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
53 :
54 : extern pgtable_t pte_alloc_one(struct mm_struct *);
55 :
56 : extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
57 :
58 16925 : static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
59 : unsigned long address)
60 : {
61 16925 : ___pte_free_tlb(tlb, pte);
62 : }
63 :
64 1974 : static inline void pmd_populate_kernel(struct mm_struct *mm,
65 : pmd_t *pmd, pte_t *pte)
66 : {
67 1974 : paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
68 1974 : set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
69 2 : }
70 :
71 1 : static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
72 : pmd_t *pmd, pte_t *pte)
73 : {
74 1 : paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
75 2 : set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
76 1 : }
77 :
78 14040 : static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
79 : struct page *pte)
80 : {
81 14040 : unsigned long pfn = page_to_pfn(pte);
82 :
83 14040 : paravirt_alloc_pte(mm, pfn);
84 14040 : set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
85 14040 : }
86 :
87 : #define pmd_pgtable(pmd) pmd_page(pmd)
88 :
89 : #if CONFIG_PGTABLE_LEVELS > 2
90 : extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
91 :
92 8893 : static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
93 : unsigned long address)
94 : {
95 8893 : ___pmd_free_tlb(tlb, pmd);
96 : }
97 :
98 : #ifdef CONFIG_X86_PAE
99 : extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
100 : #else /* !CONFIG_X86_PAE */
101 9999 : static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
102 : {
103 9999 : paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
104 9999 : set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
105 8970 : }
106 :
107 1 : static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
108 : {
109 1 : paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
110 2 : set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
111 1 : }
112 : #endif /* CONFIG_X86_PAE */
113 :
114 : #if CONFIG_PGTABLE_LEVELS > 3
115 7150 : static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
116 : {
117 7150 : paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
118 7150 : set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
119 7143 : }
120 :
121 1 : static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
122 : {
123 1 : paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
124 1 : set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
125 1 : }
126 :
127 : extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
128 :
129 7011 : static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
130 : unsigned long address)
131 : {
132 7011 : ___pud_free_tlb(tlb, pud);
133 : }
134 :
135 : #if CONFIG_PGTABLE_LEVELS > 4
136 : static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
137 : {
138 : if (!pgtable_l5_enabled())
139 : return;
140 : paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
141 : set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
142 : }
143 :
144 : static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
145 : {
146 : if (!pgtable_l5_enabled())
147 : return;
148 : paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
149 : set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
150 : }
151 :
152 : static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
153 : {
154 : gfp_t gfp = GFP_KERNEL_ACCOUNT;
155 :
156 : if (mm == &init_mm)
157 : gfp &= ~__GFP_ACCOUNT;
158 : return (p4d_t *)get_zeroed_page(gfp);
159 : }
160 :
161 : static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
162 : {
163 : if (!pgtable_l5_enabled())
164 : return;
165 :
166 : BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
167 : free_page((unsigned long)p4d);
168 : }
169 :
170 : extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
171 :
172 : static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
173 : unsigned long address)
174 : {
175 : if (pgtable_l5_enabled())
176 : ___p4d_free_tlb(tlb, p4d);
177 : }
178 :
179 : #endif /* CONFIG_PGTABLE_LEVELS > 4 */
180 : #endif /* CONFIG_PGTABLE_LEVELS > 3 */
181 : #endif /* CONFIG_PGTABLE_LEVELS > 2 */
182 :
183 : #endif /* _ASM_X86_PGALLOC_H */
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