[linux-block.git] / arch / s390 / include / asm / hugetlb.h

/* 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, unsigned long sz);
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)
		set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
	else
		set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
}

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);
}

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_none_mostly(pte_t pte)
{
	return huge_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_novma(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 pte_t huge_pte_mkuffd_wp(pte_t pte)
{
	return pte;
}

static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
{
	return pte;
}

static inline int huge_pte_uffd_wp(pte_t pte)
{
	return 0;
}

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

#endif /* _ASM_S390_HUGETLB_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
53492b1d GS	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
ca5999fd	12	#include <linux/pgtable.h>
65fddcfc	13	#include <asm/page.h>
53492b1d	14
53492b1d	15	#define hugetlb_free_pgd_range free_pgd_range
466178fc	16	#define hugepages_supported() (MACHINE_HAS_EDAT1)
53492b1d GS	17
53492b1d GS	18	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
935d4f0c RR	19	pte_t *ptep, pte_t pte, unsigned long sz);
935d4f0c RR	20	void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
53492b1d	21	pte_t *ptep, pte_t pte);
e5098611 MS	22	pte_t huge_ptep_get(pte_t *ptep);
	23	pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	24	unsigned long addr, pte_t *ptep);
53492b1d GS	25
	26	/*
	27	* If the arch doesn't supply something else, assume that hugepage
	28	* size aligned regions are ok without further preparation.
	29	*/
a5516438 AK	30	static inline int prepare_hugepage_range(struct file *file,
a5516438 AK	31	unsigned long addr, unsigned long len)
53492b1d	32	{
7c8d42fd GS	33	struct hstate *h = hstate_file(file);
	34
	35	if (len & ~huge_page_mask(h))
53492b1d	36	return -EINVAL;
7c8d42fd	37	if (addr & ~huge_page_mask(h))
53492b1d GS	38	return -EINVAL;
	39	return 0;
	40	}
	41
3afdfca6 JF	42	static inline void arch_clear_hugepage_flags(struct page *page)
	43	{
	44	clear_bit(PG_arch_1, &page->flags);
	45	}
5be99343	46	#define arch_clear_hugepage_flags arch_clear_hugepage_flags
53492b1d	47
e5098611	48	static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
9386fac3	49	pte_t *ptep, unsigned long sz)
53492b1d	50	{
d08de8e2	51	if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
b8e3b379	52	set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
d08de8e2	53	else
b8e3b379	54	set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
53492b1d GS	55	}
53492b1d GS	56
ae075629 BW	57	static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
ae075629 BW	58	unsigned long address, pte_t *ptep)
53492b1d	59	{
ae075629	60	return huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
53492b1d GS	61	}
53492b1d GS	62
e5098611 MS	63	static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
	64	unsigned long addr, pte_t *ptep,
	65	pte_t pte, int dirty)
53492b1d	66	{
e5098611 MS	67	int changed = !pte_same(huge_ptep_get(ptep), pte);
	68	if (changed) {
	69	huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
935d4f0c	70	__set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
53492b1d	71	}
e5098611	72	return changed;
53492b1d GS	73	}
53492b1d GS	74
e5098611 MS	75	static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
e5098611 MS	76	unsigned long addr, pte_t *ptep)
53492b1d	77	{
e5098611	78	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
935d4f0c	79	__set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
53492b1d GS	80	}
53492b1d GS	81
e5098611	82	static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
53492b1d	83	{
e5098611	84	return mk_pte(page, pgprot);
53492b1d GS	85	}
53492b1d GS	86
e5098611	87	static inline int huge_pte_none(pte_t pte)
106c992a	88	{
e5098611	89	return pte_none(pte);
106c992a GS	90	}
106c992a GS	91
679d1033 PX	92	static inline int huge_pte_none_mostly(pte_t pte)
	93	{
	94	return huge_pte_none(pte);
	95	}
	96
106c992a GS	97	static inline int huge_pte_write(pte_t pte)
106c992a GS	98	{
e5098611	99	return pte_write(pte);
106c992a GS	100	}
	101
	102	static inline int huge_pte_dirty(pte_t pte)
	103	{
e5098611	104	return pte_dirty(pte);
106c992a GS	105	}
	106
	107	static inline pte_t huge_pte_mkwrite(pte_t pte)
	108	{
2f0584f3	109	return pte_mkwrite_novma(pte);
106c992a GS	110	}
	111
	112	static inline pte_t huge_pte_mkdirty(pte_t pte)
	113	{
e5098611	114	return pte_mkdirty(pte);
106c992a GS	115	}
106c992a GS	116
e5098611	117	static inline pte_t huge_pte_wrprotect(pte_t pte)
106c992a	118	{
e5098611	119	return pte_wrprotect(pte);
106c992a GS	120	}
106c992a GS	121
e5098611	122	static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
106c992a	123	{
e5098611	124	return pte_modify(pte, newprot);
106c992a GS	125	}
106c992a GS	126
229f3fa7 PX	127	static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
	128	{
	129	return pte;
	130	}
	131
	132	static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
	133	{
	134	return pte;
	135	}
	136
	137	static inline int huge_pte_uffd_wp(pte_t pte)
	138	{
	139	return 0;
	140	}
	141
4eb0716e AG	142	static inline bool gigantic_page_runtime_supported(void)
	143	{
	144	return true;
	145	}
	146
53492b1d	147	#endif /* _ASM_S390_HUGETLB_H */