1 /* SPDX-License-Identifier: GPL-2.0 */
3 * IBM System z Huge TLB Page Support for Kernel.
5 * Copyright IBM Corp. 2008
6 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 #ifndef _ASM_S390_HUGETLB_H
10 #define _ASM_S390_HUGETLB_H
13 #include <asm/pgtable.h>
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)
20 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
21 pte_t *ptep, pte_t pte);
22 pte_t huge_ptep_get(pte_t *ptep);
23 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
24 unsigned long addr, pte_t *ptep);
27 * If the arch doesn't supply something else, assume that hugepage
28 * size aligned regions are ok without further preparation.
30 static inline int prepare_hugepage_range(struct file *file,
31 unsigned long addr, unsigned long len)
33 if (len & ~HPAGE_MASK)
35 if (addr & ~HPAGE_MASK)
40 static inline void arch_clear_hugepage_flags(struct page *page)
42 clear_bit(PG_arch_1, &page->flags);
45 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
46 pte_t *ptep, unsigned long sz)
48 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
49 pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
51 pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
54 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
55 unsigned long address, pte_t *ptep)
57 huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
60 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
61 unsigned long addr, pte_t *ptep,
64 int changed = !pte_same(huge_ptep_get(ptep), pte);
66 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
67 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
72 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
73 unsigned long addr, pte_t *ptep)
75 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
76 set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
79 static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
81 return mk_pte(page, pgprot);
84 static inline int huge_pte_none(pte_t pte)
89 static inline int huge_pte_write(pte_t pte)
91 return pte_write(pte);
94 static inline int huge_pte_dirty(pte_t pte)
96 return pte_dirty(pte);
99 static inline pte_t huge_pte_mkwrite(pte_t pte)
101 return pte_mkwrite(pte);
104 static inline pte_t huge_pte_mkdirty(pte_t pte)
106 return pte_mkdirty(pte);
109 static inline pte_t huge_pte_wrprotect(pte_t pte)
111 return pte_wrprotect(pte);
114 static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
116 return pte_modify(pte, newprot);
119 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
120 static inline bool gigantic_page_supported(void) { return true; }
122 #endif /* _ASM_S390_HUGETLB_H */