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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  IBM System z Huge TLB Page Support for Kernel.
   4 *
   5 *    Copyright IBM Corp. 2008
   6 *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
   7 */
   8
   9#ifndef _ASM_S390_HUGETLB_H
  10#define _ASM_S390_HUGETLB_H
  11
  12#include <asm/page.h>
  13#include <asm/pgtable.h>
  14
  15
  16#define is_hugepage_only_range(mm, addr, len)   0
  17#define hugetlb_free_pgd_range                  free_pgd_range
  18#define hugepages_supported()                   (MACHINE_HAS_EDAT1)
  19
  20void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  21                     pte_t *ptep, pte_t pte);
  22pte_t huge_ptep_get(pte_t *ptep);
  23pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  24                              unsigned long addr, pte_t *ptep);
  25
  26/*
  27 * If the arch doesn't supply something else, assume that hugepage
  28 * size aligned regions are ok without further preparation.
  29 */
  30static inline int prepare_hugepage_range(struct file *file,
  31                        unsigned long addr, unsigned long len)
  32{
  33        if (len & ~HPAGE_MASK)
  34                return -EINVAL;
  35        if (addr & ~HPAGE_MASK)
  36                return -EINVAL;
  37        return 0;
  38}
  39
  40static inline void arch_clear_hugepage_flags(struct page *page)
  41{
  42        clear_bit(PG_arch_1, &page->flags);
  43}
  44
  45static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  46                                  pte_t *ptep, unsigned long sz)
  47{
  48        if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
  49                pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
  50        else
  51                pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
  52}
  53
  54static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  55                                         unsigned long address, pte_t *ptep)
  56{
  57        huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
  58}
  59
  60static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  61                                             unsigned long addr, pte_t *ptep,
  62                                             pte_t pte, int dirty)
  63{
  64        int changed = !pte_same(huge_ptep_get(ptep), pte);
  65        if (changed) {
  66                huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  67                set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
  68        }
  69        return changed;
  70}
  71
  72static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  73                                           unsigned long addr, pte_t *ptep)
  74{
  75        pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
  76        set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
  77}
  78
  79static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
  80{
  81        return mk_pte(page, pgprot);
  82}
  83
  84static inline int huge_pte_none(pte_t pte)
  85{
  86        return pte_none(pte);
  87}
  88
  89static inline int huge_pte_write(pte_t pte)
  90{
  91        return pte_write(pte);
  92}
  93
  94static inline int huge_pte_dirty(pte_t pte)
  95{
  96        return pte_dirty(pte);
  97}
  98
  99static inline pte_t huge_pte_mkwrite(pte_t pte)
 100{
 101        return pte_mkwrite(pte);
 102}
 103
 104static inline pte_t huge_pte_mkdirty(pte_t pte)
 105{
 106        return pte_mkdirty(pte);
 107}
 108
 109static inline pte_t huge_pte_wrprotect(pte_t pte)
 110{
 111        return pte_wrprotect(pte);
 112}
 113
 114static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
 115{
 116        return pte_modify(pte, newprot);
 117}
 118
 119#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
 120static inline bool gigantic_page_supported(void) { return true; }
 121#endif
 122#endif /* _ASM_S390_HUGETLB_H */
 123