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/* SPDX-License-Identifier: GPL-2.0 */
/*
* IBM System z Huge TLB Page Support for Kernel.
*
* Copyright IBM Corp. 2008
* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
*/
#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
extern pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
extern 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_NONE
static inline int huge_pte_none(pte_t pte)
{
return pte_none(pte);
}
#define __HAVE_ARCH_HUGE_PTE_NONE_MOSTLY
static inline int huge_pte_none_mostly(pte_t pte)
{
return huge_pte_none(pte) || is_pte_marker(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 */
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