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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 <linux/pgtable.h>
13#include <asm/page.h>
14
15#define hugetlb_free_pgd_range free_pgd_range
16#define hugepages_supported() (MACHINE_HAS_EDAT1)
17
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte, unsigned long sz);
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 struct hstate *h = hstate_file(file);
34
35 if (len & ~huge_page_mask(h))
36 return -EINVAL;
37 if (addr & ~huge_page_mask(h))
38 return -EINVAL;
39 return 0;
40}
41
42static inline void arch_clear_hugepage_flags(struct page *page)
43{
44 clear_bit(PG_arch_1, &page->flags);
45}
46#define arch_clear_hugepage_flags arch_clear_hugepage_flags
47
48static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
49 pte_t *ptep, unsigned long sz)
50{
51 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
52 set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
53 else
54 set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
55}
56
57static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
58 unsigned long address, pte_t *ptep)
59{
60 return huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
61}
62
63static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
64 unsigned long addr, pte_t *ptep,
65 pte_t pte, int dirty)
66{
67 int changed = !pte_same(huge_ptep_get(ptep), pte);
68 if (changed) {
69 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
70 __set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
71 }
72 return changed;
73}
74
75static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
76 unsigned long addr, pte_t *ptep)
77{
78 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
79 __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
80}
81
82static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
83{
84 return mk_pte(page, pgprot);
85}
86
87static inline int huge_pte_none(pte_t pte)
88{
89 return pte_none(pte);
90}
91
92static inline int huge_pte_none_mostly(pte_t pte)
93{
94 return huge_pte_none(pte);
95}
96
97static inline int huge_pte_write(pte_t pte)
98{
99 return pte_write(pte);
100}
101
102static inline int huge_pte_dirty(pte_t pte)
103{
104 return pte_dirty(pte);
105}
106
107static inline pte_t huge_pte_mkwrite(pte_t pte)
108{
109 return pte_mkwrite_novma(pte);
110}
111
112static inline pte_t huge_pte_mkdirty(pte_t pte)
113{
114 return pte_mkdirty(pte);
115}
116
117static inline pte_t huge_pte_wrprotect(pte_t pte)
118{
119 return pte_wrprotect(pte);
120}
121
122static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
123{
124 return pte_modify(pte, newprot);
125}
126
127static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
128{
129 return pte;
130}
131
132static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
133{
134 return pte;
135}
136
137static inline int huge_pte_uffd_wp(pte_t pte)
138{
139 return 0;
140}
141
142static inline bool gigantic_page_runtime_supported(void)
143{
144 return true;
145}
146
147#endif /* _ASM_S390_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
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20pte_t huge_ptep_get(pte_t *ptep);
21pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
22 unsigned long addr, pte_t *ptep);
23
24/*
25 * If the arch doesn't supply something else, assume that hugepage
26 * size aligned regions are ok without further preparation.
27 */
28static inline int prepare_hugepage_range(struct file *file,
29 unsigned long addr, unsigned long len)
30{
31 if (len & ~HPAGE_MASK)
32 return -EINVAL;
33 if (addr & ~HPAGE_MASK)
34 return -EINVAL;
35 return 0;
36}
37
38#define hugetlb_prefault_arch_hook(mm) do { } while (0)
39#define arch_clear_hugepage_flags(page) do { } while (0)
40
41int arch_prepare_hugepage(struct page *page);
42void arch_release_hugepage(struct page *page);
43
44static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
45 pte_t *ptep)
46{
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#endif /* _ASM_S390_HUGETLB_H */