arch/x86/include/asm/pgalloc.h

   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 static 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)
  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) {}
  26 #endif
  27
  28 /*
  29  * Flags to use when allocating a user page table page.
  30  */
  31 extern gfp_t __userpte_alloc_gfp;
  32
  33 /*
  34  * Allocate and free page tables.
  35  */
  36 extern pgd_t *pgd_alloc(struct mm_struct *);
  37 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  38
  39 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  40 extern 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
  45 static 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
  51 static inline void pte_free(struct mm_struct *mm, struct page *pte)
  52 {
  53         pgtable_page_dtor(pte);
  54         __free_page(pte);
  55 }
  56
  57 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  58
  59 static 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
  65 static 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
  72 static 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
  84 static 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
 101 static 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
 108 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 109
 110 static 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
 117 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 118 #else   /* !CONFIG_X86_PAE */
 119 static 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
 127 static 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
 133 static 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
 142 static 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
 148 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 149
 150 static 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
 157 static 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
 163 static 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
 172 static 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
 178 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
 179
 180 static 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 */