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review.trustedfirmware.org / hafnium / third_party / linux / 92d4c21e51fc12736c39c2a161a42f20e2be8a00 / . / arch / s390 / include / asm / hugetlb.h
blob: d3642fb634bd98ec036d40dede4f7a85be595c27 [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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
Olivier Deprez157378f2022-04-04 15:47:50 +0200[diff] [blame]12#include <linux/pgtable.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]13#include <asm/page.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]14
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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);
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{
Olivier Deprez92d4c212022-12-06 15:05:30 +0100[diff] [blame^]31 struct hstate *h = hstate_file(file);
32
33 if (len & ~huge_page_mask(h))
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]34 return -EINVAL;
Olivier Deprez92d4c212022-12-06 15:05:30 +0100[diff] [blame^]35 if (addr & ~huge_page_mask(h))
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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}
Olivier Deprez157378f2022-04-04 15:47:50 +0200[diff] [blame]44#define arch_clear_hugepage_flags arch_clear_hugepage_flags
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]45
46static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
47 pte_t *ptep, unsigned long sz)
48{
49 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
50 pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
51 else
52 pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
53}
54
55static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
56 unsigned long address, pte_t *ptep)
57{
58 huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
59}
60
61static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
62 unsigned long addr, pte_t *ptep,
63 pte_t pte, int dirty)
64{
65 int changed = !pte_same(huge_ptep_get(ptep), pte);
66 if (changed) {
67 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
68 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
69 }
70 return changed;
71}
72
73static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
74 unsigned long addr, pte_t *ptep)
75{
76 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
77 set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
78}
79
80static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
81{
82 return mk_pte(page, pgprot);
83}
84
85static inline int huge_pte_none(pte_t pte)
86{
87 return pte_none(pte);
88}
89
90static inline int huge_pte_write(pte_t pte)
91{
92 return pte_write(pte);
93}
94
95static inline int huge_pte_dirty(pte_t pte)
96{
97 return pte_dirty(pte);
98}
99
100static inline pte_t huge_pte_mkwrite(pte_t pte)
101{
102 return pte_mkwrite(pte);
103}
104
105static inline pte_t huge_pte_mkdirty(pte_t pte)
106{
107 return pte_mkdirty(pte);
108}
109
110static inline pte_t huge_pte_wrprotect(pte_t pte)
111{
112 return pte_wrprotect(pte);
113}
114
115static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
116{
117 return pte_modify(pte, newprot);
118}
119
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]120static inline bool gigantic_page_runtime_supported(void)
121{
122 return true;
123}
124
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]125#endif /* _ASM_S390_HUGETLB_H */