[linux-2.6-block.git] / arch / s390 / include / asm / hugetlb.h

/*
 *  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 <asm/page.h>
#include <asm/pgtable.h>


#define is_hugepage_only_range(mm, addr, len)	0
#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)
{
	if (len & ~HPAGE_MASK)
		return -EINVAL;
	if (addr & ~HPAGE_MASK)
		return -EINVAL;
	return 0;
}

#define arch_clear_hugepage_flags(page)		do { } while (0)

static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
				  pte_t *ptep)
{
	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);
}

#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void) { return true; }
#endif
#endif /* _ASM_S390_HUGETLB_H */
Commit	Line	Data
53492b1d GS	1	/*
	2	* IBM System z Huge TLB Page Support for Kernel.
	3	*
	4	* Copyright IBM Corp. 2008
	5	* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
	6	*/
	7
	8	#ifndef _ASM_S390_HUGETLB_H
	9	#define _ASM_S390_HUGETLB_H
	10
	11	#include <asm/page.h>
	12	#include <asm/pgtable.h>
	13
	14
	15	#define is_hugepage_only_range(mm, addr, len) 0
	16	#define hugetlb_free_pgd_range free_pgd_range
466178fc	17	#define hugepages_supported() (MACHINE_HAS_EDAT1)
53492b1d GS	18
	19	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	20	pte_t *ptep, pte_t pte);
e5098611 MS	21	pte_t huge_ptep_get(pte_t *ptep);
	22	pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	23	unsigned long addr, pte_t *ptep);
53492b1d GS	24
	25	/*
	26	* If the arch doesn't supply something else, assume that hugepage
	27	* size aligned regions are ok without further preparation.
	28	*/
a5516438 AK	29	static inline int prepare_hugepage_range(struct file *file,
a5516438 AK	30	unsigned long addr, unsigned long len)
53492b1d GS	31	{
	32	if (len & ~HPAGE_MASK)
	33	return -EINVAL;
	34	if (addr & ~HPAGE_MASK)
	35	return -EINVAL;
	36	return 0;
	37	}
	38
5d3a551c	39	#define arch_clear_hugepage_flags(page) do { } while (0)
53492b1d	40
e5098611 MS	41	static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
e5098611 MS	42	pte_t *ptep)
53492b1d	43	{
d08de8e2 GS	44	if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
	45	pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
	46	else
	47	pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
53492b1d GS	48	}
53492b1d GS	49
e5098611 MS	50	static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
e5098611 MS	51	unsigned long address, pte_t *ptep)
53492b1d	52	{
e5098611	53	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
53492b1d GS	54	}
53492b1d GS	55
e5098611 MS	56	static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
	57	unsigned long addr, pte_t *ptep,
	58	pte_t pte, int dirty)
53492b1d	59	{
e5098611 MS	60	int changed = !pte_same(huge_ptep_get(ptep), pte);
	61	if (changed) {
	62	huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
	63	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
53492b1d	64	}
e5098611	65	return changed;
53492b1d GS	66	}
53492b1d GS	67
e5098611 MS	68	static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
e5098611 MS	69	unsigned long addr, pte_t *ptep)
53492b1d	70	{
e5098611 MS	71	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
e5098611 MS	72	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
53492b1d GS	73	}
53492b1d GS	74
e5098611	75	static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
53492b1d	76	{
e5098611	77	return mk_pte(page, pgprot);
53492b1d GS	78	}
53492b1d GS	79
e5098611	80	static inline int huge_pte_none(pte_t pte)
106c992a	81	{
e5098611	82	return pte_none(pte);
106c992a GS	83	}
	84
	85	static inline int huge_pte_write(pte_t pte)
	86	{
e5098611	87	return pte_write(pte);
106c992a GS	88	}
	89
	90	static inline int huge_pte_dirty(pte_t pte)
	91	{
e5098611	92	return pte_dirty(pte);
106c992a GS	93	}
	94
	95	static inline pte_t huge_pte_mkwrite(pte_t pte)
	96	{
e5098611	97	return pte_mkwrite(pte);
106c992a GS	98	}
	99
	100	static inline pte_t huge_pte_mkdirty(pte_t pte)
	101	{
e5098611	102	return pte_mkdirty(pte);
106c992a GS	103	}
106c992a GS	104
e5098611	105	static inline pte_t huge_pte_wrprotect(pte_t pte)
106c992a	106	{
e5098611	107	return pte_wrprotect(pte);
106c992a GS	108	}
106c992a GS	109
e5098611	110	static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
106c992a	111	{
e5098611	112	return pte_modify(pte, newprot);
106c992a GS	113	}
106c992a GS	114
e1073d1e AK	115	#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
	116	static inline bool gigantic_page_supported(void) { return true; }
	117	#endif
53492b1d	118	#endif /* _ASM_S390_HUGETLB_H */