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/cpufeature.h>
13 #include <linux/pgtable.h>
14 #include <linux/swap.h>
15 #include <linux/swapops.h>
16 #include <asm/page.h>
17
18 #define hugepages_supported() cpu_has_edat1()
19
20 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
21 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
22 pte_t *ptep, pte_t pte, unsigned long sz);
23 void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
24 pte_t *ptep, pte_t pte);
25
26 #define __HAVE_ARCH_HUGE_PTEP_GET
27 pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
28
29 pte_t __huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
30 pte_t *ptep);
31
32 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
huge_ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep,unsigned long sz)33 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
34 unsigned long addr, pte_t *ptep,
35 unsigned long sz)
36 {
37 return __huge_ptep_get_and_clear(mm, addr, ptep);
38 }
39
arch_clear_hugetlb_flags(struct folio * folio)40 static inline void arch_clear_hugetlb_flags(struct folio *folio)
41 {
42 clear_bit(PG_arch_1, &folio->flags);
43 }
44 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
45
46 #define __HAVE_ARCH_HUGE_PTE_CLEAR
huge_pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep,unsigned long sz)47 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
48 pte_t *ptep, unsigned long sz)
49 {
50 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
51 set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
52 else
53 set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
54 }
55
56 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
huge_ptep_clear_flush(struct vm_area_struct * vma,unsigned long address,pte_t * ptep)57 static 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
63 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
huge_ptep_set_access_flags(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep,pte_t pte,int dirty)64 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
65 unsigned long addr, pte_t *ptep,
66 pte_t pte, int dirty)
67 {
68 int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte);
69
70 if (changed) {
71 __huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
72 __set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
73 }
74 return changed;
75 }
76
77 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
huge_ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)78 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
79 unsigned long addr, pte_t *ptep)
80 {
81 pte_t pte = __huge_ptep_get_and_clear(mm, addr, ptep);
82
83 __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
84 }
85
86 #define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP
huge_pte_mkuffd_wp(pte_t pte)87 static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
88 {
89 return pte;
90 }
91
92 #define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP
huge_pte_clear_uffd_wp(pte_t pte)93 static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
94 {
95 return pte;
96 }
97
98 #define __HAVE_ARCH_HUGE_PTE_UFFD_WP
huge_pte_uffd_wp(pte_t pte)99 static inline int huge_pte_uffd_wp(pte_t pte)
100 {
101 return 0;
102 }
103
104 #include <asm-generic/hugetlb.h>
105
106 #endif /* _ASM_S390_HUGETLB_H */
107