[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

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

/*
 * 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 hugetlb_prefault_arch_hook(mm)		do { } while (0)
#define arch_clear_hugepage_flags(page)		do { } while (0)

int arch_prepare_hugepage(struct page *page);
void arch_release_hugepage(struct page *page);

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
	pte_val(pte) |= _PAGE_RO;
	return pte;
}

static inline int huge_pte_none(pte_t pte)
{
	return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
		!(pte_val(pte) & _SEGMENT_ENTRY_RO);
}

static inline pte_t huge_ptep_get(pte_t *ptep)
{
	pte_t pte = *ptep;
	unsigned long mask;

	if (!MACHINE_HAS_HPAGE) {
		ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
		if (ptep) {
			mask = pte_val(pte) &
				(_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
			pte = pte_mkhuge(*ptep);
			pte_val(pte) |= mask;
		}
	}
	return pte;
}

static inline void __pmd_csp(pmd_t *pmdp)
{
	register unsigned long reg2 asm("2") = pmd_val(*pmdp);
	register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
					       _SEGMENT_ENTRY_INV;
	register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;

	asm volatile(
		"	csp %1,%3"
		: "=m" (*pmdp)
		: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
}

static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
{
	unsigned long sto = (unsigned long) pmdp -
				pmd_index(address) * sizeof(pmd_t);

	if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
		asm volatile(
			"	.insn	rrf,0xb98e0000,%2,%3,0,0"
			: "=m" (*pmdp)
			: "m" (*pmdp), "a" (sto),
			  "a" ((address & HPAGE_MASK))
		);
	}
	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
}

static inline void huge_ptep_invalidate(struct mm_struct *mm,
					unsigned long address, pte_t *ptep)
{
	pmd_t *pmdp = (pmd_t *) ptep;

	if (MACHINE_HAS_IDTE)
		__pmd_idte(address, pmdp);
	else
		__pmd_csp(pmdp);
}

static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
					    unsigned long addr, pte_t *ptep)
{
	pte_t pte = huge_ptep_get(ptep);

	huge_ptep_invalidate(mm, addr, ptep);
	return pte;
}

#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
({									    \
	int __changed = !pte_same(huge_ptep_get(__ptep), __entry);	    \
	if (__changed) {						    \
		huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep);	    \
		set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry);   \
	}								    \
	__changed;							    \
})

#define huge_ptep_set_wrprotect(__mm, __addr, __ptep)			\
({									\
	pte_t __pte = huge_ptep_get(__ptep);				\
	if (pte_write(__pte)) {						\
		huge_ptep_invalidate(__mm, __addr, __ptep);		\
		set_huge_pte_at(__mm, __addr, __ptep,			\
				huge_pte_wrprotect(__pte));		\
	}								\
})

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

#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
	17
	18	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	19	pte_t *ptep, pte_t pte);
	20
	21	/*
	22	* If the arch doesn't supply something else, assume that hugepage
	23	* size aligned regions are ok without further preparation.
	24	*/
a5516438 AK	25	static inline int prepare_hugepage_range(struct file *file,
a5516438 AK	26	unsigned long addr, unsigned long len)
53492b1d GS	27	{
	28	if (len & ~HPAGE_MASK)
	29	return -EINVAL;
	30	if (addr & ~HPAGE_MASK)
	31	return -EINVAL;
	32	return 0;
	33	}
	34
	35	#define hugetlb_prefault_arch_hook(mm) do { } while (0)
5d3a551c	36	#define arch_clear_hugepage_flags(page) do { } while (0)
53492b1d GS	37
	38	int arch_prepare_hugepage(struct page *page);
	39	void arch_release_hugepage(struct page *page);
	40
53492b1d GS	41	static inline pte_t huge_pte_wrprotect(pte_t pte)
	42	{
	43	pte_val(pte) \|= _PAGE_RO;
	44	return pte;
	45	}
	46
	47	static inline int huge_pte_none(pte_t pte)
	48	{
	49	return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
	50	!(pte_val(pte) & _SEGMENT_ENTRY_RO);
	51	}
	52
	53	static inline pte_t huge_ptep_get(pte_t *ptep)
	54	{
	55	pte_t pte = *ptep;
	56	unsigned long mask;
	57
	58	if (!MACHINE_HAS_HPAGE) {
	59	ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
	60	if (ptep) {
	61	mask = pte_val(pte) &
	62	(_SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY_RO);
	63	pte = pte_mkhuge(*ptep);
	64	pte_val(pte) \|= mask;
	65	}
	66	}
	67	return pte;
	68	}
	69
53492b1d GS	70	static inline void __pmd_csp(pmd_t *pmdp)
	71	{
	72	register unsigned long reg2 asm("2") = pmd_val(*pmdp);
	73	register unsigned long reg3 asm("3") = pmd_val(*pmdp) \|
	74	_SEGMENT_ENTRY_INV;
	75	register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
	76
	77	asm volatile(
	78	" csp %1,%3"
	79	: "=m" (*pmdp)
	80	: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
	81	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY;
	82	}
	83
	84	static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
	85	{
	86	unsigned long sto = (unsigned long) pmdp -
	87	pmd_index(address) * sizeof(pmd_t);
	88
	89	if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
	90	asm volatile(
	91	" .insn rrf,0xb98e0000,%2,%3,0,0"
	92	: "=m" (*pmdp)
	93	: "m" (*pmdp), "a" (sto),
	94	"a" ((address & HPAGE_MASK))
	95	);
	96	}
	97	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY;
	98	}
	99
	100	static inline void huge_ptep_invalidate(struct mm_struct *mm,
	101	unsigned long address, pte_t *ptep)
	102	{
	103	pmd_t pmdp = (pmd_t ) ptep;
	104
043d0708	105	if (MACHINE_HAS_IDTE)
53492b1d	106	__pmd_idte(address, pmdp);
043d0708 MS	107	else
043d0708 MS	108	__pmd_csp(pmdp);
53492b1d GS	109	}
53492b1d GS	110
9016083b GS	111	static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	112	unsigned long addr, pte_t *ptep)
	113	{
	114	pte_t pte = huge_ptep_get(ptep);
	115
	116	huge_ptep_invalidate(mm, addr, ptep);
	117	return pte;
	118	}
	119
53492b1d GS	120	#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
	121	({ \
	122	int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
	123	if (__changed) { \
	124	huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
	125	set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
	126	} \
	127	__changed; \
	128	})
	129
	130	#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
	131	({ \
	132	pte_t __pte = huge_ptep_get(__ptep); \
	133	if (pte_write(__pte)) { \
9016083b	134	huge_ptep_invalidate(__mm, __addr, __ptep); \
53492b1d GS	135	set_huge_pte_at(__mm, __addr, __ptep, \
	136	huge_pte_wrprotect(__pte)); \
	137	} \
	138	})
	139
	140	static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
	141	unsigned long address, pte_t *ptep)
	142	{
	143	huge_ptep_invalidate(vma->vm_mm, address, ptep);
	144	}
	145
	146	#endif /* _ASM_S390_HUGETLB_H */