arch/x86/include/asm/pgalloc.h

   1 #ifndef _ASM_X86_PGALLOC_H
   2 #define _ASM_X86_PGALLOC_H
   3
   4 #include <linux/threads.h>
   5 #include <linux/mm.h>           /* for struct page */
   6 #include <linux/pagemap.h>
   7
   8 static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
   9
  10 #ifdef CONFIG_PARAVIRT
  11 #include <asm/paravirt.h>
  12 #else
  13 #define paravirt_pgd_alloc(mm)  __paravirt_pgd_alloc(mm)
  14 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
  15 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)  {}
  16 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)  {}
  17 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
  18                                             unsigned long start, unsigned long count) {}
  19 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)  {}
  20 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)  {}
  21 static inline void paravirt_release_pte(unsigned long pfn) {}
  22 static inline void paravirt_release_pmd(unsigned long pfn) {}
  23 static inline void paravirt_release_pud(unsigned long pfn) {}
  24 static inline void paravirt_release_p4d(unsigned long pfn) {}
  25 #endif
  26
  27 /*
  28  * Flags to use when allocating a user page table page.
  29  */
  30 extern gfp_t __userpte_alloc_gfp;
  31
  32 /*
  33  * Allocate and free page tables.
  34  */
  35 extern pgd_t *pgd_alloc(struct mm_struct *);
  36 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  37
  38 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  39 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  40
  41 /* Should really implement gc for free page table pages. This could be
  42    done with a reference count in struct page. */
  43
  44 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  45 {
  46         BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
  47         free_page((unsigned long)pte);
  48 }
  49
  50 static inline void pte_free(struct mm_struct *mm, struct page *pte)
  51 {
  52         pgtable_page_dtor(pte);
  53         __free_page(pte);
  54 }
  55
  56 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  57
  58 static 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
  64 static 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
  71 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  72                                 struct page *pte)
  73 {
  74         unsigned long pfn = page_to_pfn(pte);
  75
  76         paravirt_alloc_pte(mm, pfn);
  77         set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  78 }
  79
  80 #define pmd_pgtable(pmd) pmd_page(pmd)
  81
  82 #if CONFIG_PGTABLE_LEVELS > 2
  83 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  84 {
  85         struct page *page;
  86         gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
  87
  88         if (mm == &init_mm)
  89                 gfp &= ~__GFP_ACCOUNT;
  90         page = alloc_pages(gfp, 0);
  91         if (!page)
  92                 return NULL;
  93         if (!pgtable_pmd_page_ctor(page)) {
  94                 __free_pages(page, 0);
  95                 return NULL;
  96         }
  97         return (pmd_t *)page_address(page);
  98 }
  99
 100 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 101 {
 102         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
 103         pgtable_pmd_page_dtor(virt_to_page(pmd));
 104         free_page((unsigned long)pmd);
 105 }
 106
 107 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 108
 109 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 110                                   unsigned long address)
 111 {
 112         ___pmd_free_tlb(tlb, pmd);
 113 }
 114
 115 #ifdef CONFIG_X86_PAE
 116 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 117 #else   /* !CONFIG_X86_PAE */
 118 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 119 {
 120         paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 121         set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 122 }
 123 #endif  /* CONFIG_X86_PAE */
 124
 125 #if CONFIG_PGTABLE_LEVELS > 3
 126 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 127 {
 128         paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 129         set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
 130 }
 131
 132 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 133 {
 134         gfp_t gfp = GFP_KERNEL_ACCOUNT;
 135
 136         if (mm == &init_mm)
 137                 gfp &= ~__GFP_ACCOUNT;
 138         return (pud_t *)get_zeroed_page(gfp);
 139 }
 140
 141 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 142 {
 143         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
 144         free_page((unsigned long)pud);
 145 }
 146
 147 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 148
 149 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 150                                   unsigned long address)
 151 {
 152         ___pud_free_tlb(tlb, pud);
 153 }
 154
 155 #if CONFIG_PGTABLE_LEVELS > 4
 156 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
 157 {
 158         paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
 159         set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
 160 }
 161
 162 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
 163 {
 164         gfp_t gfp = GFP_KERNEL_ACCOUNT;
 165
 166         if (mm == &init_mm)
 167                 gfp &= ~__GFP_ACCOUNT;
 168         return (p4d_t *)get_zeroed_page(gfp);
 169 }
 170
 171 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 172 {
 173         BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
 174         free_page((unsigned long)p4d);
 175 }
 176
 177 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
 178
 179 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
 180                                   unsigned long address)
 181 {
 182         ___p4d_free_tlb(tlb, p4d);
 183 }
 184
 185 #endif  /* CONFIG_PGTABLE_LEVELS > 4 */
 186 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 187 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 188
 189 #endif /* _ASM_X86_PGALLOC_H */