arch/tile/include/asm/hugetlb.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_HUGETLB_H
  16 #define _ASM_TILE_HUGETLB_H
  17
  18 #include <asm/page.h>
  19
  20
  21 static inline int is_hugepage_only_range(struct mm_struct *mm,
  22                                          unsigned long addr,
  23                                          unsigned long len) {
  24         return 0;
  25 }
  26
  27 /*
  28  * If the arch doesn't supply something else, assume that hugepage
  29  * size aligned regions are ok without further preparation.
  30  */
  31 static inline int prepare_hugepage_range(struct file *file,
  32                                          unsigned long addr, unsigned long len)
  33 {
  34         struct hstate *h = hstate_file(file);
  35         if (len & ~huge_page_mask(h))
  36                 return -EINVAL;
  37         if (addr & ~huge_page_mask(h))
  38                 return -EINVAL;
  39         return 0;
  40 }
  41
  42 static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  43 {
  44 }
  45
  46 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  47                                           unsigned long addr, unsigned long end,
  48                                           unsigned long floor,
  49                                           unsigned long ceiling)
  50 {
  51         free_pgd_range(tlb, addr, end, floor, ceiling);
  52 }
  53
  54 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  55                                    pte_t *ptep, pte_t pte)
  56 {
  57         set_pte(ptep, pte);
  58 }
  59
  60 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  61                                             unsigned long addr, pte_t *ptep)
  62 {
  63         return ptep_get_and_clear(mm, addr, ptep);
  64 }
  65
  66 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  67                                          unsigned long addr, pte_t *ptep)
  68 {
  69         ptep_clear_flush(vma, addr, ptep);
  70 }
  71
  72 static inline int huge_pte_none(pte_t pte)
  73 {
  74         return pte_none(pte);
  75 }
  76
  77 static inline pte_t huge_pte_wrprotect(pte_t pte)
  78 {
  79         return pte_wrprotect(pte);
  80 }
  81
  82 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  83                                            unsigned long addr, pte_t *ptep)
  84 {
  85         ptep_set_wrprotect(mm, addr, ptep);
  86 }
  87
  88 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  89                                              unsigned long addr, pte_t *ptep,
  90                                              pte_t pte, int dirty)
  91 {
  92         return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  93 }
  94
  95 static inline pte_t huge_ptep_get(pte_t *ptep)
  96 {
  97         return *ptep;
  98 }
  99
 100 static inline int arch_prepare_hugepage(struct page *page)
 101 {
 102         return 0;
 103 }
 104
 105 static inline void arch_release_hugepage(struct page *page)
 106 {
 107 }
 108
 109 static inline void arch_clear_hugepage_flags(struct page *page)
 110 {
 111 }
 112
 113 #ifdef CONFIG_HUGETLB_SUPER_PAGES
 114 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 115                                        struct page *page, int writable)
 116 {
 117         size_t pagesize = huge_page_size(hstate_vma(vma));
 118         if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 119                 entry = pte_mksuper(entry);
 120         return entry;
 121 }
 122 #define arch_make_huge_pte arch_make_huge_pte
 123
 124 /* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 125 enum {
 126         HUGE_SHIFT_PGDIR = 0,
 127         HUGE_SHIFT_PMD = 1,
 128         HUGE_SHIFT_PAGE = 2,
 129         HUGE_SHIFT_ENTRIES
 130 };
 131 extern int huge_shift[HUGE_SHIFT_ENTRIES];
 132 #endif
 133
 134 #endif /* _ASM_TILE_HUGETLB_H */