/* 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 <asm/page.h>

#define hugetlb_free_pgd_range			free_pgd_range
#define hugepages_supported()			(MACHINE_HAS_EDAT1)

void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		     pte_t *ptep, pte_t pte);
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
			      unsigned long addr, pte_t *ptep);

/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
static inline int prepare_hugepage_range(struct file *file,
			unsigned long addr, unsigned long len)
{
	struct hstate *h = hstate_file(file);

	if (len & ~huge_page_mask(h))
		return -EINVAL;
	if (addr & ~huge_page_mask(h))
		return -EINVAL;
	return 0;
}

static inline void arch_clear_hugepage_flags(struct page *page)
{
	clear_bit(PG_arch_1, &page->flags);
}
#define arch_clear_hugepage_flags arch_clear_hugepage_flags

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)
		pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
	else
		pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
}

static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
					 unsigned long address, pte_t *ptep)
{
	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
}

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(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;
}

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));
}

static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
{
	return mk_pte(page, pgprot);
}

static inline int huge_pte_none(pte_t pte)
{
	return pte_none(pte);
}

static inline int huge_pte_write(pte_t pte)
{
	return pte_write(pte);
}

static inline int huge_pte_dirty(pte_t pte)
{
	return pte_dirty(pte);
}

static inline pte_t huge_pte_mkwrite(pte_t pte)
{
	return pte_mkwrite(pte);
}

static inline pte_t huge_pte_mkdirty(pte_t pte)
{
	return pte_mkdirty(pte);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
	return pte_wrprotect(pte);
}

static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
{
	return pte_modify(pte, newprot);
}

static inline bool gigantic_page_runtime_supported(void)
{
	return true;
}

#endif /* _ASM_S390_HUGETLB_H */