From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 27 Sep 2012 08:45:06 +0000 (+0200)
Subject: s390/mm: use pfmf instruction to initialize storage keys
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=85e9d0e5ffabfede5facbac5b0d9b90768bc6e90;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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>
---

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;
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index a798985515b7..bc1b87b7453a 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -76,6 +76,7 @@ extern unsigned int s390_user_mode;
 #define MACHINE_FLAG_MVCOS	(1UL << 8)
 #define MACHINE_FLAG_KVM	(1UL << 9)
 #define MACHINE_FLAG_EDAT1	(1UL << 10)
+#define MACHINE_FLAG_EDAT2	(1UL << 11)
 #define MACHINE_FLAG_LPAR	(1UL << 12)
 #define MACHINE_FLAG_SPP	(1UL << 13)
 #define MACHINE_FLAG_TOPOLOGY	(1UL << 14)
@@ -98,6 +99,7 @@ extern unsigned int s390_user_mode;
 #define MACHINE_HAS_MVPG	(S390_lowcore.machine_flags & MACHINE_FLAG_MVPG)
 #define MACHINE_HAS_MVCOS	(0)
 #define MACHINE_HAS_EDAT1	(0)
+#define MACHINE_HAS_EDAT2	(0)
 #define MACHINE_HAS_SPP		(0)
 #define MACHINE_HAS_TOPOLOGY	(0)
 #define MACHINE_HAS_TE		(0)
@@ -110,6 +112,7 @@ extern unsigned int s390_user_mode;
 #define MACHINE_HAS_MVPG	(1)
 #define MACHINE_HAS_MVCOS	(S390_lowcore.machine_flags & MACHINE_FLAG_MVCOS)
 #define MACHINE_HAS_EDAT1	(S390_lowcore.machine_flags & MACHINE_FLAG_EDAT1)
+#define MACHINE_HAS_EDAT2	(S390_lowcore.machine_flags & MACHINE_FLAG_EDAT2)
 #define MACHINE_HAS_SPP		(S390_lowcore.machine_flags & MACHINE_FLAG_SPP)
 #define MACHINE_HAS_TOPOLOGY	(S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
 #define MACHINE_HAS_TE		(S390_lowcore.machine_flags & MACHINE_FLAG_TE)
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 4c91d078d091..1f0eee9e7daa 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -374,6 +374,8 @@ static __init void detect_machine_facilities(void)
 		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
 		__ctl_set_bit(0, 23);
 	}
+	if (test_facility(78))
+		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
 	if (test_facility(3))
 		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
 	if (test_facility(27))
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index afa9fdba200e..bfb48f18169c 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -768,6 +768,40 @@ static void __init reserve_crashkernel(void)
 #endif
 }
 
+static void __init init_storage_keys(unsigned long start, unsigned long end)
+{
+	unsigned long boundary, function, size;
+
+	while (start < end) {
+		if (MACHINE_HAS_EDAT2) {
+			/* set storage keys for a 2GB frame */
+			function = 0x22000 | PAGE_DEFAULT_KEY;
+			size = 1UL << 31;
+			boundary = (start + size) & ~(size - 1);
+			if (boundary <= end) {
+				do {
+					start = pfmf(function, start);
+				} while (start < boundary);
+				continue;
+			}
+		}
+		if (MACHINE_HAS_EDAT1) {
+			/* set storage keys for a 1MB frame */
+			function = 0x21000 | PAGE_DEFAULT_KEY;
+			size = 1UL << 20;
+			boundary = (start + size) & ~(size - 1);
+			if (boundary <= end) {
+				do {
+					start = pfmf(function, start);
+				} while (start < boundary);
+				continue;
+			}
+		}
+		page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
+		start += PAGE_SIZE;
+	}
+}
+
 static void __init setup_memory(void)
 {
         unsigned long bootmap_size;
@@ -846,9 +880,7 @@ static void __init setup_memory(void)
 		memblock_add_node(PFN_PHYS(start_chunk),
 				  PFN_PHYS(end_chunk - start_chunk), 0);
 		pfn = max(start_chunk, start_pfn);
-		for (; pfn < end_chunk; pfn++)
-			page_set_storage_key(PFN_PHYS(pfn),
-					     PAGE_DEFAULT_KEY, 0);
+		init_storage_keys(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
 	}
 
 	psw_set_key(PAGE_DEFAULT_KEY);