s390/mm: use pfmf instruction to initialize storage keys

Make use of the pfmf instruction, if available, to initialize storage keys
of whole 1MB or 2GB frames instead of initializing every single page with
the sske instruction.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 27ab3c7c1e8b..6d5367060a56 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -30,12 +30,20 @@
 #include <asm/setup.h>
 #ifndef __ASSEMBLY__
 
+static unsigned long pfmf(unsigned long function, unsigned long address)
+{
+        asm volatile(
+                "       .insn   rre,0xb9af0000,%[function],%[address]"
+                : [address] "+a" (address)
+                : [function] "d" (function)
+                : "memory");
+        return address;
+}
+
 static inline void clear_page(void *page)
 {
         if (MACHINE_HAS_PFMF) {
-                asm volatile(
-                        "       .insn   rre,0xb9af0000,%0,%1"
-                        : : "d" (0x10000), "a" (page) : "memory", "cc");
+                pfmf(0x10000, (unsigned long)page);
         } else {
                 register unsigned long reg1 asm ("1") = 0;
                 register void *reg2 asm ("2") = page;