hugetlb.h

  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/cpufeature.h>
 13#include <linux/pgtable.h>
 14#include <linux/swap.h>
 15#include <linux/swapops.h>
 16#include <asm/page.h>
 17
 18#define hugepages_supported()	cpu_has_edat1()
 19
 20#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
 21void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 22		     pte_t *ptep, pte_t pte, unsigned long sz);
 23void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 24		       pte_t *ptep, pte_t pte);
 25
 26#define __HAVE_ARCH_HUGE_PTEP_GET
 27pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 28
 29pte_t __huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 30				pte_t *ptep);
 31
 32#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
 33static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 34					    unsigned long addr, pte_t *ptep,
 35					    unsigned long sz)
 36{
 37	return __huge_ptep_get_and_clear(mm, addr, ptep);
 38}
 39
 40static inline void arch_clear_hugetlb_flags(struct folio *folio)
 41{
 42	clear_bit(PG_arch_1, &folio->flags.f);
 43}
 44#define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
 45
 46#define __HAVE_ARCH_HUGE_PTE_CLEAR
 47static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
 48				  pte_t *ptep, unsigned long sz)
 49{
 50	if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
 51		set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
 52	else
 53		set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
 54}
 55
 56#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
 57static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 58					  unsigned long address, pte_t *ptep)
 59{
 60	return __huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
 61}
 62
 63#define  __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
 64static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 65					     unsigned long addr, pte_t *ptep,
 66					     pte_t pte, int dirty)
 67{
 68	int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte);
 69
 70	if (changed) {
 71		__huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
 72		__set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
 73	}
 74	return changed;
 75}
 76
 77#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
 78static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 79					   unsigned long addr, pte_t *ptep)
 80{
 81	pte_t pte = __huge_ptep_get_and_clear(mm, addr, ptep);
 82
 83	__set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
 84}
 85
 86#define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP
 87static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
 88{
 89	return pte;
 90}
 91
 92#define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP
 93static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
 94{
 95	return pte;
 96}
 97
 98#define __HAVE_ARCH_HUGE_PTE_UFFD_WP
 99static inline int huge_pte_uffd_wp(pte_t pte)
100{
101	return 0;
102}
103
104#include <asm-generic/hugetlb.h>
105
106#endif /* _ASM_S390_HUGETLB_H */