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