| 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 | |
| 12 | #include <asm/page.h> |
| 13 | #include <asm/pgtable.h> |
| 14 | |
| 15 | |
| 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) |
| 19 | |
| 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); |
| 25 | |
| 26 | /* |
| 27 | * If the arch doesn't supply something else, assume that hugepage |
| 28 | * size aligned regions are ok without further preparation. |
| 29 | */ |
| 30 | static inline int prepare_hugepage_range(struct file *file, |
| 31 | unsigned long addr, unsigned long len) |
| 32 | { |
| 33 | if (len & ~HPAGE_MASK) |
| 34 | return -EINVAL; |
| 35 | if (addr & ~HPAGE_MASK) |
| 36 | return -EINVAL; |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static inline void arch_clear_hugepage_flags(struct page *page) |
| 41 | { |
| 42 | clear_bit(PG_arch_1, &page->flags); |
| 43 | } |
| 44 | |
| 45 | static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, |
| 46 | pte_t *ptep, unsigned long sz) |
| 47 | { |
| 48 | if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) |
| 49 | pte_val(*ptep) = _REGION3_ENTRY_EMPTY; |
| 50 | else |
| 51 | pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY; |
| 52 | } |
| 53 | |
| 54 | static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, |
| 55 | unsigned long address, pte_t *ptep) |
| 56 | { |
| 57 | huge_ptep_get_and_clear(vma->vm_mm, address, ptep); |
| 58 | } |
| 59 | |
| 60 | static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| 61 | unsigned long addr, pte_t *ptep, |
| 62 | pte_t pte, int dirty) |
| 63 | { |
| 64 | int changed = !pte_same(huge_ptep_get(ptep), pte); |
| 65 | if (changed) { |
| 66 | huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); |
| 67 | set_huge_pte_at(vma->vm_mm, addr, ptep, pte); |
| 68 | } |
| 69 | return changed; |
| 70 | } |
| 71 | |
| 72 | static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| 73 | unsigned long addr, pte_t *ptep) |
| 74 | { |
| 75 | pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); |
| 76 | set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); |
| 77 | } |
| 78 | |
| 79 | static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) |
| 80 | { |
| 81 | return mk_pte(page, pgprot); |
| 82 | } |
| 83 | |
| 84 | static inline int huge_pte_none(pte_t pte) |
| 85 | { |
| 86 | return pte_none(pte); |
| 87 | } |
| 88 | |
| 89 | static inline int huge_pte_write(pte_t pte) |
| 90 | { |
| 91 | return pte_write(pte); |
| 92 | } |
| 93 | |
| 94 | static inline int huge_pte_dirty(pte_t pte) |
| 95 | { |
| 96 | return pte_dirty(pte); |
| 97 | } |
| 98 | |
| 99 | static inline pte_t huge_pte_mkwrite(pte_t pte) |
| 100 | { |
| 101 | return pte_mkwrite(pte); |
| 102 | } |
| 103 | |
| 104 | static inline pte_t huge_pte_mkdirty(pte_t pte) |
| 105 | { |
| 106 | return pte_mkdirty(pte); |
| 107 | } |
| 108 | |
| 109 | static inline pte_t huge_pte_wrprotect(pte_t pte) |
| 110 | { |
| 111 | return pte_wrprotect(pte); |
| 112 | } |
| 113 | |
| 114 | static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) |
| 115 | { |
| 116 | return pte_modify(pte, newprot); |
| 117 | } |
| 118 | |
| 119 | #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE |
| 120 | static inline bool gigantic_page_supported(void) { return true; } |
| 121 | #endif |
| 122 | #endif /* _ASM_S390_HUGETLB_H */ |