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 19 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 20 pte_t *ptep, pte_t pte); 21 pte_t huge_ptep_get(pte_t *ptep); 22 pte_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 */ 29 static 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 41 static 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 50 static 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 56 static 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 68 static 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 75 static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) 76 { 77 return mk_pte(page, pgprot); 78 } 79 80 static inline int huge_pte_none(pte_t pte) 81 { 82 return pte_none(pte); 83 } 84 85 static inline int huge_pte_write(pte_t pte) 86 { 87 return pte_write(pte); 88 } 89 90 static inline int huge_pte_dirty(pte_t pte) 91 { 92 return pte_dirty(pte); 93 } 94 95 static inline pte_t huge_pte_mkwrite(pte_t pte) 96 { 97 return pte_mkwrite(pte); 98 } 99 100 static inline pte_t huge_pte_mkdirty(pte_t pte) 101 { 102 return pte_mkdirty(pte); 103 } 104 105 static inline pte_t huge_pte_wrprotect(pte_t pte) 106 { 107 return pte_wrprotect(pte); 108 } 109 110 static 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 116 static inline bool gigantic_page_supported(void) { return true; } 117 #endif 118 #endif /* _ASM_S390_HUGETLB_H */ 119