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 static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
11 #ifdef CONFIG_PARAVIRT
12 #include <asm/paravirt.h>
14 #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
15 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
16 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
17 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
18 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
19 unsigned long start, unsigned long count) {}
20 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
21 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
22 static inline void paravirt_release_pte(unsigned long pfn) {}
23 static inline void paravirt_release_pmd(unsigned long pfn) {}
24 static inline void paravirt_release_pud(unsigned long pfn) {}
25 static inline void paravirt_release_p4d(unsigned long pfn) {}
29 * Flags to use when allocating a user page table page.
31 extern gfp_t __userpte_alloc_gfp;
33 #ifdef CONFIG_PAGE_TABLE_ISOLATION
35 * Instead of one PGD, we acquire two PGDs. Being order-1, it is
36 * both 8k in size and 8k-aligned. That lets us just flip bit 12
37 * in a pointer to swap between the two 4k halves.
39 #define PGD_ALLOCATION_ORDER 1
41 #define PGD_ALLOCATION_ORDER 0
45 * Allocate and free page tables.
47 extern pgd_t *pgd_alloc(struct mm_struct *);
48 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
50 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
51 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
53 /* Should really implement gc for free page table pages. This could be
54 done with a reference count in struct page. */
56 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
58 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
59 free_page((unsigned long)pte);
62 static inline void pte_free(struct mm_struct *mm, struct page *pte)
64 pgtable_page_dtor(pte);
68 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
70 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
71 unsigned long address)
73 ___pte_free_tlb(tlb, pte);
76 static inline void pmd_populate_kernel(struct mm_struct *mm,
77 pmd_t *pmd, pte_t *pte)
79 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
80 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
83 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
86 unsigned long pfn = page_to_pfn(pte);
88 paravirt_alloc_pte(mm, pfn);
89 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
92 #define pmd_pgtable(pmd) pmd_page(pmd)
94 #if CONFIG_PGTABLE_LEVELS > 2
95 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
98 gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
101 gfp &= ~__GFP_ACCOUNT;
102 page = alloc_pages(gfp, 0);
105 if (!pgtable_pmd_page_ctor(page)) {
106 __free_pages(page, 0);
109 return (pmd_t *)page_address(page);
112 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
114 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
115 pgtable_pmd_page_dtor(virt_to_page(pmd));
116 free_page((unsigned long)pmd);
119 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
121 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
122 unsigned long address)
124 ___pmd_free_tlb(tlb, pmd);
127 #ifdef CONFIG_X86_PAE
128 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
129 #else /* !CONFIG_X86_PAE */
130 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
132 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
133 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
135 #endif /* CONFIG_X86_PAE */
137 #if CONFIG_PGTABLE_LEVELS > 3
138 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
140 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
141 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
144 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
146 gfp_t gfp = GFP_KERNEL_ACCOUNT;
149 gfp &= ~__GFP_ACCOUNT;
150 return (pud_t *)get_zeroed_page(gfp);
153 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
155 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
156 free_page((unsigned long)pud);
159 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
161 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
162 unsigned long address)
164 ___pud_free_tlb(tlb, pud);
167 #if CONFIG_PGTABLE_LEVELS > 4
168 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
170 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
171 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
174 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
176 gfp_t gfp = GFP_KERNEL_ACCOUNT;
179 gfp &= ~__GFP_ACCOUNT;
180 return (p4d_t *)get_zeroed_page(gfp);
183 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
185 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
186 free_page((unsigned long)p4d);
189 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
191 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
192 unsigned long address)
194 ___p4d_free_tlb(tlb, p4d);
197 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
198 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
199 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
201 #endif /* _ASM_X86_PGALLOC_H */