LXR linux/arch/s390/include/asm/hugetlb.h

   1/*
   2 *  IBM System z Huge TLB Page Support for Kernel.
   3 *
   4 *    Copyright IBM Corp. 2008
   5 *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
   6 */
   7
   8#ifndef _ASM_S390_HUGETLB_H
   9#define _ASM_S390_HUGETLB_H
  10
  11#include <asm/page.h>
  12#include <asm/pgtable.h>
  13
  14
  15#define is_hugepage_only_range(mm, addr, len)   0
  16#define hugetlb_free_pgd_range                  free_pgd_range
  17#define hugepages_supported()                   (MACHINE_HAS_EDAT1)
  18
  19void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  20                     pte_t *ptep, pte_t pte);
  21pte_t huge_ptep_get(pte_t *ptep);
  22pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  23                              unsigned long addr, pte_t *ptep);
  24
  25/*
  26 * If the arch doesn't supply something else, assume that hugepage
  27 * size aligned regions are ok without further preparation.
  28 */
  29static inline int prepare_hugepage_range(struct file *file,
  30                        unsigned long addr, unsigned long len)
  31{
  32        if (len & ~HPAGE_MASK)
  33                return -EINVAL;
  34        if (addr & ~HPAGE_MASK)
  35                return -EINVAL;
  36        return 0;
  37}
  38
  39#define arch_clear_hugepage_flags(page)         do { } while (0)
  40
  41static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  42                                  pte_t *ptep, unsigned long sz)
  43{
  44        if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
  45                pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
  46        else
  47                pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
  48}
  49
  50static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  51                                         unsigned long address, pte_t *ptep)
  52{
  53        huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
  54}
  55
  56static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  57                                             unsigned long addr, pte_t *ptep,
  58                                             pte_t pte, int dirty)
  59{
  60        int changed = !pte_same(huge_ptep_get(ptep), pte);
  61        if (changed) {
  62                huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  63                set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
  64        }
  65        return changed;
  66}
  67
  68static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  69                                           unsigned long addr, pte_t *ptep)
  70{
  71        pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
  72        set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
  73}
  74
  75static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
  76{
  77        return mk_pte(page, pgprot);
  78}
  79
  80static inline int huge_pte_none(pte_t pte)
  81{
  82        return pte_none(pte);
  83}
  84
  85static inline int huge_pte_write(pte_t pte)
  86{
  87        return pte_write(pte);
  88}
  89
  90static inline int huge_pte_dirty(pte_t pte)
  91{
  92        return pte_dirty(pte);
  93}
  94
  95static inline pte_t huge_pte_mkwrite(pte_t pte)
  96{
  97        return pte_mkwrite(pte);
  98}
  99
 100static inline pte_t huge_pte_mkdirty(pte_t pte)
 101{
 102        return pte_mkdirty(pte);
 103}
 104
 105static inline pte_t huge_pte_wrprotect(pte_t pte)
 106{
 107        return pte_wrprotect(pte);
 108}
 109
 110static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
 111{
 112        return pte_modify(pte, newprot);
 113}
 114
 115#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
 116static inline bool gigantic_page_supported(void) { return true; }
 117#endif
 118#endif /* _ASM_S390_HUGETLB_H */
 119