Commit 9e20b4da authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/pgtable: make pmd and pud helper functions available 



Make pmd_wrprotect() and pmd_mkwrite() available independently from
CONFIG_TRANSPARENT_HUGEPAGE and CONFIG_HUGETLB_PAGE so these can be
used on the kernel mapping.

Also introduce a couple of pud helper functions, namely pud_pfn(),
pud_wrprotect(), pud_mkwrite(), pud_mkdirty() and pud_mkclean()
which only work on the kernel mapping.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 3e76ee99

arch/s390/include/asm/pgtable.h

+63 −14
Original line number Diff line number Diff line
@@ -270,6 +270,9 @@ static inline int is_module_addr(void *addr) 
#define _REGION3_ENTRY		(_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)

#define _REGION3_ENTRY_EMPTY	(_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID)



#define _REGION3_ENTRY_ORIGIN_LARGE ~0x7fffffffUL /* large page address	     */

#define _REGION3_ENTRY_ORIGIN  ~0x7ffUL/* region third table origin	     */



#define _REGION3_ENTRY_DIRTY	0x2000	/* SW region dirty bit */

#define _REGION3_ENTRY_YOUNG	0x1000	/* SW region young bit */

#define _REGION3_ENTRY_LARGE	0x0400	/* RTTE-format control, large page  */
@@ -525,6 +528,16 @@ static inline int pud_large(pud_t pud) 
	return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);

}



static inline unsigned long pud_pfn(pud_t pud)

{

	unsigned long origin_mask;



	origin_mask = _REGION3_ENTRY_ORIGIN;

	if (pud_large(pud))

		origin_mask = _REGION3_ENTRY_ORIGIN_LARGE;

	return (pud_val(pud) & origin_mask) >> PAGE_SHIFT;

}



static inline int pud_bad(pud_t pud)

{

	/*
@@ -1020,20 +1033,6 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 
#define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)

#define pte_unmap(pte) do { } while (0)



#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)

static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)

{

	/*

	 * pgprot is PAGE_NONE, PAGE_READ, or PAGE_WRITE (see __Pxxx / __Sxxx)

	 * Convert to segment table entry format.

	 */

	if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))

		return pgprot_val(SEGMENT_NONE);

	if (pgprot_val(pgprot) == pgprot_val(PAGE_READ))

		return pgprot_val(SEGMENT_READ);

	return pgprot_val(SEGMENT_WRITE);

}



static inline pmd_t pmd_wrprotect(pmd_t pmd)

{

	pmd_val(pmd) &= ~_SEGMENT_ENTRY_WRITE;
@@ -1070,6 +1069,56 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd) 
	return pmd;

}



static inline pud_t pud_wrprotect(pud_t pud)

{

	pud_val(pud) &= ~_REGION3_ENTRY_WRITE;

	pud_val(pud) |= _REGION_ENTRY_PROTECT;

	return pud;

}



static inline pud_t pud_mkwrite(pud_t pud)

{

	pud_val(pud) |= _REGION3_ENTRY_WRITE;

	if (pud_large(pud) && !(pud_val(pud) & _REGION3_ENTRY_DIRTY))

		return pud;

	pud_val(pud) &= ~_REGION_ENTRY_PROTECT;

	return pud;

}



static inline pud_t pud_mkclean(pud_t pud)

{

	if (pud_large(pud)) {

		pud_val(pud) &= ~_REGION3_ENTRY_DIRTY;

		pud_val(pud) |= _REGION_ENTRY_PROTECT;

	}

	return pud;

}



static inline pud_t pud_mkdirty(pud_t pud)

{

	if (pud_large(pud)) {

		pud_val(pud) |= _REGION3_ENTRY_DIRTY |

				_REGION3_ENTRY_SOFT_DIRTY;

		if (pud_val(pud) & _REGION3_ENTRY_WRITE)

			pud_val(pud) &= ~_REGION_ENTRY_PROTECT;

	}

	return pud;

}



#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)

static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)

{

	/*

	 * pgprot is PAGE_NONE, PAGE_READ, or PAGE_WRITE (see __Pxxx / __Sxxx)

	 * Convert to segment table entry format.

	 */

	if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))

		return pgprot_val(SEGMENT_NONE);

	if (pgprot_val(pgprot) == pgprot_val(PAGE_READ))

		return pgprot_val(SEGMENT_READ);

	return pgprot_val(SEGMENT_WRITE);

}



static inline pmd_t pmd_mkyoung(pmd_t pmd)

{

	if (pmd_large(pmd)) {

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