pgalloc.h (5306B)
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 13static 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) 19static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} 20static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} 21static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} 22static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, 23 unsigned long start, unsigned long count) {} 24static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} 25static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {} 26static inline void paravirt_release_pte(unsigned long pfn) {} 27static inline void paravirt_release_pmd(unsigned long pfn) {} 28static inline void paravirt_release_pud(unsigned long pfn) {} 29static inline void paravirt_release_p4d(unsigned long pfn) {} 30#endif 31 32/* 33 * Flags to use when allocating a user page table page. 34 */ 35extern 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 */ 51extern pgd_t *pgd_alloc(struct mm_struct *); 52extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 53 54extern pgtable_t pte_alloc_one(struct mm_struct *); 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_kernel_safe(struct mm_struct *mm, 72 pmd_t *pmd, pte_t *pte) 73{ 74 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); 75 set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); 76} 77 78static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 79 struct page *pte) 80{ 81 unsigned long pfn = page_to_pfn(pte); 82 83 paravirt_alloc_pte(mm, pfn); 84 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); 85} 86 87#if CONFIG_PGTABLE_LEVELS > 2 88extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); 89 90static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, 91 unsigned long address) 92{ 93 ___pmd_free_tlb(tlb, pmd); 94} 95 96#ifdef CONFIG_X86_PAE 97extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 98#else /* !CONFIG_X86_PAE */ 99static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 100{ 101 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 102 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); 103} 104 105static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 106{ 107 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 108 set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd))); 109} 110#endif /* CONFIG_X86_PAE */ 111 112#if CONFIG_PGTABLE_LEVELS > 3 113static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 114{ 115 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 116 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud))); 117} 118 119static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 120{ 121 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 122 set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); 123} 124 125extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); 126 127static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, 128 unsigned long address) 129{ 130 ___pud_free_tlb(tlb, pud); 131} 132 133#if CONFIG_PGTABLE_LEVELS > 4 134static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 135{ 136 if (!pgtable_l5_enabled()) 137 return; 138 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); 139 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); 140} 141 142static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 143{ 144 if (!pgtable_l5_enabled()) 145 return; 146 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); 147 set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); 148} 149 150static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) 151{ 152 gfp_t gfp = GFP_KERNEL_ACCOUNT; 153 154 if (mm == &init_mm) 155 gfp &= ~__GFP_ACCOUNT; 156 return (p4d_t *)get_zeroed_page(gfp); 157} 158 159static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) 160{ 161 if (!pgtable_l5_enabled()) 162 return; 163 164 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); 165 free_page((unsigned long)p4d); 166} 167 168extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); 169 170static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, 171 unsigned long address) 172{ 173 if (pgtable_l5_enabled()) 174 ___p4d_free_tlb(tlb, p4d); 175} 176 177#endif /* CONFIG_PGTABLE_LEVELS > 4 */ 178#endif /* CONFIG_PGTABLE_LEVELS > 3 */ 179#endif /* CONFIG_PGTABLE_LEVELS > 2 */ 180 181#endif /* _ASM_X86_PGALLOC_H */