[deliverable/linux.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)

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)
	36
	37	int arch_prepare_hugepage(struct page *page);
	38	void arch_release_hugepage(struct page *page);
	39
53492b1d GS	40	static inline pte_t huge_pte_wrprotect(pte_t pte)
	41	{
	42	pte_val(pte) \|= _PAGE_RO;
	43	return pte;
	44	}
	45
	46	static inline int huge_pte_none(pte_t pte)
	47	{
	48	return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
	49	!(pte_val(pte) & _SEGMENT_ENTRY_RO);
	50	}
	51
	52	static inline pte_t huge_ptep_get(pte_t *ptep)
	53	{
	54	pte_t pte = *ptep;
	55	unsigned long mask;
	56
	57	if (!MACHINE_HAS_HPAGE) {
	58	ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
	59	if (ptep) {
	60	mask = pte_val(pte) &
	61	(_SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY_RO);
	62	pte = pte_mkhuge(*ptep);
	63	pte_val(pte) \|= mask;
	64	}
	65	}
	66	return pte;
	67	}
	68
53492b1d GS	69	static inline void __pmd_csp(pmd_t *pmdp)
	70	{
	71	register unsigned long reg2 asm("2") = pmd_val(*pmdp);
	72	register unsigned long reg3 asm("3") = pmd_val(*pmdp) \|
	73	_SEGMENT_ENTRY_INV;
	74	register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
	75
	76	asm volatile(
	77	" csp %1,%3"
	78	: "=m" (*pmdp)
	79	: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
	80	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY;
	81	}
	82
	83	static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
	84	{
	85	unsigned long sto = (unsigned long) pmdp -
	86	pmd_index(address) * sizeof(pmd_t);
	87
	88	if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
	89	asm volatile(
	90	" .insn rrf,0xb98e0000,%2,%3,0,0"
	91	: "=m" (*pmdp)
	92	: "m" (*pmdp), "a" (sto),
	93	"a" ((address & HPAGE_MASK))
	94	);
	95	}
	96	pmd_val(*pmdp) = _SEGMENT_ENTRY_INV \| _SEGMENT_ENTRY;
	97	}
	98
	99	static inline void huge_ptep_invalidate(struct mm_struct *mm,
	100	unsigned long address, pte_t *ptep)
	101	{
	102	pmd_t pmdp = (pmd_t ) ptep;
	103
043d0708	104	if (MACHINE_HAS_IDTE)
53492b1d	105	__pmd_idte(address, pmdp);
043d0708 MS	106	else
043d0708 MS	107	__pmd_csp(pmdp);
53492b1d GS	108	}
53492b1d GS	109
9016083b GS	110	static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	111	unsigned long addr, pte_t *ptep)
	112	{
	113	pte_t pte = huge_ptep_get(ptep);
	114
	115	huge_ptep_invalidate(mm, addr, ptep);
	116	return pte;
	117	}
	118
53492b1d GS	119	#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
	120	({ \
	121	int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
	122	if (__changed) { \
	123	huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
	124	set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
	125	} \
	126	__changed; \
	127	})
	128
	129	#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
	130	({ \
	131	pte_t __pte = huge_ptep_get(__ptep); \
	132	if (pte_write(__pte)) { \
9016083b	133	huge_ptep_invalidate(__mm, __addr, __ptep); \
53492b1d GS	134	set_huge_pte_at(__mm, __addr, __ptep, \
	135	huge_pte_wrprotect(__pte)); \
	136	} \
	137	})
	138
	139	static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
	140	unsigned long address, pte_t *ptep)
	141	{
	142	huge_ptep_invalidate(vma->vm_mm, address, ptep);
	143	}
	144
	145	#endif /* _ASM_S390_HUGETLB_H */