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 <linux/swap.h> 14 #include <linux/swapops.h> 15 #include <asm/page.h> 16 17 #define hugepages_supported() (MACHINE_HAS_EDAT1) 18 19 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT 20 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 21 pte_t *ptep, pte_t pte, unsigned long sz); 22 void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 23 pte_t *ptep, pte_t pte); 24 25 #define __HAVE_ARCH_HUGE_PTEP_GET 26 pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 27 28 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 29 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 30 31 static inline void arch_clear_hugetlb_flags(struct folio *folio) 32 { 33 clear_bit(PG_arch_1, &folio->flags); 34 } 35 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags 36 37 #define __HAVE_ARCH_HUGE_PTE_CLEAR 38 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, 39 pte_t *ptep, unsigned long sz) 40 { 41 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) 42 set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY)); 43 else 44 set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY)); 45 } 46 47 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 48 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, 49 unsigned long address, pte_t *ptep) 50 { 51 return huge_ptep_get_and_clear(vma->vm_mm, address, ptep); 52 } 53 54 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 55 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 56 unsigned long addr, pte_t *ptep, 57 pte_t pte, int dirty) 58 { 59 int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte); 60 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 68 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 69 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 70 unsigned long addr, pte_t *ptep) 71 { 72 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); 73 74 __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); 75 } 76 77 #define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP 78 static inline pte_t huge_pte_mkuffd_wp(pte_t pte) 79 { 80 return pte; 81 } 82 83 #define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP 84 static inline pte_t huge_pte_clear_uffd_wp(pte_t pte) 85 { 86 return pte; 87 } 88 89 #define __HAVE_ARCH_HUGE_PTE_UFFD_WP 90 static inline int huge_pte_uffd_wp(pte_t pte) 91 { 92 return 0; 93 } 94 95 #include <asm-generic/hugetlb.h> 96 97 #endif /* _ASM_S390_HUGETLB_H */ 98