Andrew Scull | b4b6d4a | 2019-01-02 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 Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 12 | #include <linux/pgtable.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 13 | #include <asm/page.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 14 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 15 | #define hugetlb_free_pgd_range free_pgd_range |
| 16 | #define hugepages_supported() (MACHINE_HAS_EDAT1) |
| 17 | |
| 18 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
| 19 | pte_t *ptep, pte_t pte); |
| 20 | pte_t huge_ptep_get(pte_t *ptep); |
| 21 | pte_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 | */ |
| 28 | static 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 | static inline void arch_clear_hugepage_flags(struct page *page) |
| 39 | { |
| 40 | clear_bit(PG_arch_1, &page->flags); |
| 41 | } |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 42 | #define arch_clear_hugepage_flags arch_clear_hugepage_flags |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 43 | |
| 44 | static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, |
| 45 | pte_t *ptep, unsigned long sz) |
| 46 | { |
| 47 | if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) |
| 48 | pte_val(*ptep) = _REGION3_ENTRY_EMPTY; |
| 49 | else |
| 50 | pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY; |
| 51 | } |
| 52 | |
| 53 | static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, |
| 54 | unsigned long address, pte_t *ptep) |
| 55 | { |
| 56 | huge_ptep_get_and_clear(vma->vm_mm, address, ptep); |
| 57 | } |
| 58 | |
| 59 | static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| 60 | unsigned long addr, pte_t *ptep, |
| 61 | pte_t pte, int dirty) |
| 62 | { |
| 63 | int changed = !pte_same(huge_ptep_get(ptep), pte); |
| 64 | if (changed) { |
| 65 | huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); |
| 66 | set_huge_pte_at(vma->vm_mm, addr, ptep, pte); |
| 67 | } |
| 68 | return changed; |
| 69 | } |
| 70 | |
| 71 | static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| 72 | unsigned long addr, pte_t *ptep) |
| 73 | { |
| 74 | pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); |
| 75 | set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); |
| 76 | } |
| 77 | |
| 78 | static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) |
| 79 | { |
| 80 | return mk_pte(page, pgprot); |
| 81 | } |
| 82 | |
| 83 | static inline int huge_pte_none(pte_t pte) |
| 84 | { |
| 85 | return pte_none(pte); |
| 86 | } |
| 87 | |
| 88 | static inline int huge_pte_write(pte_t pte) |
| 89 | { |
| 90 | return pte_write(pte); |
| 91 | } |
| 92 | |
| 93 | static inline int huge_pte_dirty(pte_t pte) |
| 94 | { |
| 95 | return pte_dirty(pte); |
| 96 | } |
| 97 | |
| 98 | static inline pte_t huge_pte_mkwrite(pte_t pte) |
| 99 | { |
| 100 | return pte_mkwrite(pte); |
| 101 | } |
| 102 | |
| 103 | static inline pte_t huge_pte_mkdirty(pte_t pte) |
| 104 | { |
| 105 | return pte_mkdirty(pte); |
| 106 | } |
| 107 | |
| 108 | static inline pte_t huge_pte_wrprotect(pte_t pte) |
| 109 | { |
| 110 | return pte_wrprotect(pte); |
| 111 | } |
| 112 | |
| 113 | static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) |
| 114 | { |
| 115 | return pte_modify(pte, newprot); |
| 116 | } |
| 117 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 118 | static inline bool gigantic_page_runtime_supported(void) |
| 119 | { |
| 120 | return true; |
| 121 | } |
| 122 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 123 | #endif /* _ASM_S390_HUGETLB_H */ |