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 #include <asm-generic/hugetlb.h>
  20
  21
  22 static inline int is_hugepage_only_range(struct mm_struct *mm,
  23                                          unsigned long addr,
  24                                          unsigned long len) {
  25         return 0;
  26 }
  27
  28 /*
  29  * If the arch doesn't supply something else, assume that hugepage
  30  * size aligned regions are ok without further preparation.
  31  */
  32 static inline int prepare_hugepage_range(struct file *file,
  33                                          unsigned long addr, unsigned long len)
  34 {
  35         struct hstate *h = hstate_file(file);
  36         if (len & ~huge_page_mask(h))
  37                 return -EINVAL;
  38         if (addr & ~huge_page_mask(h))
  39                 return -EINVAL;
  40         return 0;
  41 }
  42
  43 static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  44 {
  45 }
  46
  47 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  48                                           unsigned long addr, unsigned long end,
  49                                           unsigned long floor,
  50                                           unsigned long ceiling)
  51 {
  52         free_pgd_range(tlb, addr, end, floor, ceiling);
  53 }
  54
  55 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  56                                    pte_t *ptep, pte_t pte)
  57 {
  58         set_pte(ptep, pte);
  59 }
  60
  61 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  62                                             unsigned long addr, pte_t *ptep)
  63 {
  64         return ptep_get_and_clear(mm, addr, ptep);
  65 }
  66
  67 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  68                                          unsigned long addr, pte_t *ptep)
  69 {
  70         ptep_clear_flush(vma, addr, ptep);
  71 }
  72
  73 static inline int huge_pte_none(pte_t pte)
  74 {
  75         return pte_none(pte);
  76 }
  77
  78 static inline pte_t huge_pte_wrprotect(pte_t pte)
  79 {
  80         return pte_wrprotect(pte);
  81 }
  82
  83 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  84                                            unsigned long addr, pte_t *ptep)
  85 {
  86         ptep_set_wrprotect(mm, addr, ptep);
  87 }
  88
  89 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  90                                              unsigned long addr, pte_t *ptep,
  91                                              pte_t pte, int dirty)
  92 {
  93         return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  94 }
  95
  96 static inline pte_t huge_ptep_get(pte_t *ptep)
  97 {
  98         return *ptep;
  99 }
 100
 101 static inline int arch_prepare_hugepage(struct page *page)
 102 {
 103         return 0;
 104 }
 105
 106 static inline void arch_release_hugepage(struct page *page)
 107 {
 108 }
 109
 110 static inline void arch_clear_hugepage_flags(struct page *page)
 111 {
 112 }
 113
 114 #ifdef CONFIG_HUGETLB_SUPER_PAGES
 115 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 116                                        struct page *page, int writable)
 117 {
 118         size_t pagesize = huge_page_size(hstate_vma(vma));
 119         if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 120                 entry = pte_mksuper(entry);
 121         return entry;
 122 }
 123 #define arch_make_huge_pte arch_make_huge_pte
 124
 125 /* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 126 enum {
 127         HUGE_SHIFT_PGDIR = 0,
 128         HUGE_SHIFT_PMD = 1,
 129         HUGE_SHIFT_PAGE = 2,
 130         HUGE_SHIFT_ENTRIES
 131 };
 132 extern int huge_shift[HUGE_SHIFT_ENTRIES];
 133 #endif
 134
 135 #endif /* _ASM_TILE_HUGETLB_H */