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Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
-rw-r--r--arch/s390/include/asm/pgtable.h66
1 files changed, 60 insertions, 6 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index bdb2f5112..024f85f94 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -193,9 +193,15 @@ static inline int is_module_addr(void *addr)
#define _PAGE_UNUSED 0x080 /* SW bit for pgste usage state */
#define __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define _PAGE_SOFT_DIRTY 0x002 /* SW pte soft dirty bit */
+#else
+#define _PAGE_SOFT_DIRTY 0x000
+#endif
+
/* Set of bits not changed in pte_modify */
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
- _PAGE_YOUNG)
+ _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
/*
* handle_pte_fault uses pte_present and pte_none to find out the pte type
@@ -285,6 +291,12 @@ static inline int is_module_addr(void *addr)
#define _SEGMENT_ENTRY_READ 0x0002 /* SW segment read bit */
#define _SEGMENT_ENTRY_WRITE 0x0001 /* SW segment write bit */
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define _SEGMENT_ENTRY_SOFT_DIRTY 0x4000 /* SW segment soft dirty bit */
+#else
+#define _SEGMENT_ENTRY_SOFT_DIRTY 0x0000 /* SW segment soft dirty bit */
+#endif
+
/*
* Segment table entry encoding (R = read-only, I = invalid, y = young bit):
* dy..R...I...wr
@@ -589,6 +601,43 @@ static inline int pmd_protnone(pmd_t pmd)
}
#endif
+static inline int pte_soft_dirty(pte_t pte)
+{
+ return pte_val(pte) & _PAGE_SOFT_DIRTY;
+}
+#define pte_swp_soft_dirty pte_soft_dirty
+
+static inline pte_t pte_mksoft_dirty(pte_t pte)
+{
+ pte_val(pte) |= _PAGE_SOFT_DIRTY;
+ return pte;
+}
+#define pte_swp_mksoft_dirty pte_mksoft_dirty
+
+static inline pte_t pte_clear_soft_dirty(pte_t pte)
+{
+ pte_val(pte) &= ~_PAGE_SOFT_DIRTY;
+ return pte;
+}
+#define pte_swp_clear_soft_dirty pte_clear_soft_dirty
+
+static inline int pmd_soft_dirty(pmd_t pmd)
+{
+ return pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY;
+}
+
+static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
+{
+ pmd_val(pmd) |= _SEGMENT_ENTRY_SOFT_DIRTY;
+ return pmd;
+}
+
+static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
+{
+ pmd_val(pmd) &= ~_SEGMENT_ENTRY_SOFT_DIRTY;
+ return pmd;
+}
+
static inline pgste_t pgste_get_lock(pte_t *ptep)
{
unsigned long new = 0;
@@ -889,7 +938,7 @@ static inline pte_t pte_mkclean(pte_t pte)
static inline pte_t pte_mkdirty(pte_t pte)
{
- pte_val(pte) |= _PAGE_DIRTY;
+ pte_val(pte) |= _PAGE_DIRTY | _PAGE_SOFT_DIRTY;
if (pte_val(pte) & _PAGE_WRITE)
pte_val(pte) &= ~_PAGE_PROTECT;
return pte;
@@ -1218,8 +1267,10 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
pte_t entry, int dirty)
{
pgste_t pgste;
+ pte_t oldpte;
- if (pte_same(*ptep, entry))
+ oldpte = *ptep;
+ if (pte_same(oldpte, entry))
return 0;
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_get_lock(ptep);
@@ -1229,7 +1280,8 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
ptep_flush_direct(vma->vm_mm, address, ptep);
if (mm_has_pgste(vma->vm_mm)) {
- pgste_set_key(ptep, pgste, entry, vma->vm_mm);
+ if (pte_val(oldpte) & _PAGE_INVALID)
+ pgste_set_key(ptep, pgste, entry, vma->vm_mm);
pgste = pgste_set_pte(ptep, pgste, entry);
pgste_set_unlock(ptep, pgste);
} else
@@ -1340,7 +1392,8 @@ static inline pmd_t pmd_mkclean(pmd_t pmd)
static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
if (pmd_large(pmd)) {
- pmd_val(pmd) |= _SEGMENT_ENTRY_DIRTY;
+ pmd_val(pmd) |= _SEGMENT_ENTRY_DIRTY |
+ _SEGMENT_ENTRY_SOFT_DIRTY;
if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE)
pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
}
@@ -1371,7 +1424,8 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
if (pmd_large(pmd)) {
pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN_LARGE |
_SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_YOUNG |
- _SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_SPLIT;
+ _SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_SPLIT |
+ _SEGMENT_ENTRY_SOFT_DIRTY;
pmd_val(pmd) |= massage_pgprot_pmd(newprot);
if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;