| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * IBM System z Huge TLB Page Support for Kernel. |
| * |
| * Copyright IBM Corp. 2008 |
| * Author(s): Gerald Schaefer <[email protected]> |
| */ |
| |
| #ifndef _ASM_S390_HUGETLB_H |
| #define _ASM_S390_HUGETLB_H |
| |
| #include <linux/pgtable.h> |
| #include <linux/swap.h> |
| #include <linux/swapops.h> |
| #include <asm/page.h> |
| |
| #define hugepages_supported() (MACHINE_HAS_EDAT1) |
| |
| #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT |
| void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pte, unsigned long sz); |
| void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pte); |
| |
| #define __HAVE_ARCH_HUGE_PTEP_GET |
| pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep); |
| |
| #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR |
| pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); |
| |
| static inline void arch_clear_hugetlb_flags(struct folio *folio) |
| { |
| clear_bit(PG_arch_1, &folio->flags); |
| } |
| #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags |
| |
| #define __HAVE_ARCH_HUGE_PTE_CLEAR |
| static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, unsigned long sz) |
| { |
| if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) |
| set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY)); |
| else |
| set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY)); |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH |
| static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, |
| unsigned long address, pte_t *ptep) |
| { |
| return huge_ptep_get_and_clear(vma->vm_mm, address, ptep); |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS |
| static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| unsigned long addr, pte_t *ptep, |
| pte_t pte, int dirty) |
| { |
| int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte); |
| |
| if (changed) { |
| huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); |
| __set_huge_pte_at(vma->vm_mm, addr, ptep, pte); |
| } |
| return changed; |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT |
| static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| unsigned long addr, pte_t *ptep) |
| { |
| pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); |
| |
| __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP |
| static inline pte_t huge_pte_mkuffd_wp(pte_t pte) |
| { |
| return pte; |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP |
| static inline pte_t huge_pte_clear_uffd_wp(pte_t pte) |
| { |
| return pte; |
| } |
| |
| #define __HAVE_ARCH_HUGE_PTE_UFFD_WP |
| static inline int huge_pte_uffd_wp(pte_t pte) |
| { |
| return 0; |
| } |
| |
| #include <asm-generic/hugetlb.h> |
| |
| #endif /* _ASM_S390_HUGETLB_H */ |
