1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGALLOC_H
3 #define _ASM_X86_PGALLOC_H
5 #include <linux/threads.h>
6 #include <linux/mm.h> /* for struct page */
7 #include <linux/pagemap.h>
9 #define __HAVE_ARCH_PTE_ALLOC_ONE
10 #include <asm-generic/pgalloc.h>
12 static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
14 #ifdef CONFIG_PARAVIRT_XXL
15 #include <asm/paravirt.h>
17 #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
18 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
19 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
20 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
21 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
22 unsigned long start, unsigned long count) {}
23 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
24 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
25 static inline void paravirt_release_pte(unsigned long pfn) {}
26 static inline void paravirt_release_pmd(unsigned long pfn) {}
27 static inline void paravirt_release_pud(unsigned long pfn) {}
28 static inline void paravirt_release_p4d(unsigned long pfn) {}
32 * Flags to use when allocating a user page table page.
34 extern gfp_t __userpte_alloc_gfp;
36 #ifdef CONFIG_PAGE_TABLE_ISOLATION
38 * Instead of one PGD, we acquire two PGDs. Being order-1, it is
39 * both 8k in size and 8k-aligned. That lets us just flip bit 12
40 * in a pointer to swap between the two 4k halves.
42 #define PGD_ALLOCATION_ORDER 1
44 #define PGD_ALLOCATION_ORDER 0
48 * Allocate and free page tables.
50 extern pgd_t *pgd_alloc(struct mm_struct *);
51 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
53 extern pgtable_t pte_alloc_one(struct mm_struct *);
55 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
57 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
58 unsigned long address)
60 ___pte_free_tlb(tlb, pte);
63 static inline void pmd_populate_kernel(struct mm_struct *mm,
64 pmd_t *pmd, pte_t *pte)
66 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
67 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
70 static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
71 pmd_t *pmd, pte_t *pte)
73 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
74 set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
77 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
80 unsigned long pfn = page_to_pfn(pte);
82 paravirt_alloc_pte(mm, pfn);
83 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
86 #define pmd_pgtable(pmd) pmd_page(pmd)
88 #if CONFIG_PGTABLE_LEVELS > 2
89 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
91 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
92 unsigned long address)
94 ___pmd_free_tlb(tlb, pmd);
98 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
99 #else /* !CONFIG_X86_PAE */
100 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
102 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
103 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
106 static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
108 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
109 set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
111 #endif /* CONFIG_X86_PAE */
113 #if CONFIG_PGTABLE_LEVELS > 3
114 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
116 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
117 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
120 static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
122 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
123 set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
126 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
128 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
129 unsigned long address)
131 ___pud_free_tlb(tlb, pud);
134 #if CONFIG_PGTABLE_LEVELS > 4
135 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
137 if (!pgtable_l5_enabled())
139 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
140 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
143 static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
145 if (!pgtable_l5_enabled())
147 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
148 set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
151 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
153 gfp_t gfp = GFP_KERNEL_ACCOUNT;
156 gfp &= ~__GFP_ACCOUNT;
157 return (p4d_t *)get_zeroed_page(gfp);
160 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
162 if (!pgtable_l5_enabled())
165 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
166 free_page((unsigned long)p4d);
169 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
171 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
172 unsigned long address)
174 if (pgtable_l5_enabled())
175 ___p4d_free_tlb(tlb, p4d);
178 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
179 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
180 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
182 #endif /* _ASM_X86_PGALLOC_H */