aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/include
diff options
context:
space:
mode:
authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-10-25 16:10:14 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-25 16:10:15 +0200
commite2b8d7af0e3a9234de06606f9151f28cf847a8d6 (patch)
tree64bc03271383a43c2097b84b6f0e25c34ed13553 /arch/s390/include
parent92f842eac7ee321c8a0749aba2513541b4ac226f (diff)
downloadlinux-linaro-android-e2b8d7af0e3a9234de06606f9151f28cf847a8d6.tar.gz
[S390] add support for nonquiescing sske
Improve performance of the sske operation by using the nonquiescing variant if the affected page has no mappings established. On machines with no support for the new sske variant the mask bit will be ignored. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r--arch/s390/include/asm/page.h8
-rw-r--r--arch/s390/include/asm/pgtable.h8
2 files changed, 10 insertions, 6 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index af650fb4720..a8729ea7e9a 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -108,9 +108,13 @@ typedef pte_t *pgtable_t;
#define __pgprot(x) ((pgprot_t) { (x) } )
static inline void
-page_set_storage_key(unsigned long addr, unsigned int skey)
+page_set_storage_key(unsigned long addr, unsigned int skey, int mapped)
{
- asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
+ if (!mapped)
+ asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
+ : : "d" (skey), "a" (addr));
+ else
+ asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
}
static inline unsigned int
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 85cd4b039de..f79e7bb9ae1 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -590,7 +590,7 @@ static inline void rcp_unlock(pte_t *ptep)
}
/* forward declaration for SetPageUptodate in page-flags.h*/
-static inline void page_clear_dirty(struct page *page);
+static inline void page_clear_dirty(struct page *page, int mapped);
#include <linux/page-flags.h>
static inline void ptep_rcp_copy(pte_t *ptep)
@@ -800,7 +800,7 @@ static inline int kvm_s390_test_and_clear_page_dirty(struct mm_struct *mm,
}
dirty = test_and_clear_bit_simple(KVM_UD_BIT, pgste);
if (skey & _PAGE_CHANGED)
- page_clear_dirty(page);
+ page_clear_dirty(page, 1);
rcp_unlock(ptep);
return dirty;
}
@@ -975,9 +975,9 @@ static inline int page_test_dirty(struct page *page)
}
#define __HAVE_ARCH_PAGE_CLEAR_DIRTY
-static inline void page_clear_dirty(struct page *page)
+static inline void page_clear_dirty(struct page *page, int mapped)
{
- page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
+ page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY, mapped);
}
/*