[PATCH] s390: DCSS block device driver.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Add z/VM discontiguos saved segments (DCSS) block device driver.

arch/s390/defconfig

@@ -134,6 +134,7 @@ CONFIG_BLK_DEV_INITRD=y
 # S/390 block device drivers
 #
 CONFIG_BLK_DEV_XPRAM=m
+# CONFIG_DCSSBLK is not set
 CONFIG_DASD=y
 # CONFIG_DASD_PROFILE is not set
 CONFIG_DASD_ECKD=y

arch/s390/mm/Makefile

@@ -2,6 +2,6 @@
 # Makefile for the linux s390-specific parts of the memory manager.
 #
 
-obj-y	 := init.o fault.o ioremap.o
+obj-y	 := init.o fault.o ioremap.o extmem.o
 obj-$(CONFIG_CMM) += cmm.o
 

drivers/s390/block/Kconfig

@@ -11,6 +11,11 @@ config BLK_DEV_XPRAM
 	  This option is also available as a module which will be called
 	  xpram.  If unsure, say "N".
 
+config DCSSBLK
+	tristate "DCSSBLK support"
+	help
+	  Support for dcss block device
+
 config DASD
 	tristate "Support for DASD devices"
 	depends on CCW

drivers/s390/block/Makefile

@@ -14,3 +14,4 @@ obj-$(CONFIG_DASD_ECKD) += dasd_eckd_mod.o
 obj-$(CONFIG_DASD_FBA)  += dasd_fba_mod.o
 obj-$(CONFIG_DASD_CMB)  += dasd_cmb.o
 obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o
+obj-$(CONFIG_DCSSBLK) += dcssblk.o

include/asm-s390/extmem.h

+/*
+ *  include/asm-s390x/extmem.h
+ *
+ *  definitions for external memory segment support
+ *  Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ */
+
+#ifndef _ASM_S390X_DCSS_H
+#define _ASM_S390X_DCSS_H
+#ifndef __ASSEMBLY__
+#define SEGMENT_SHARED_RW       0
+#define SEGMENT_SHARED_RO       1
+#define SEGMENT_EXCLUSIVE_RW    2
+#define SEGMENT_EXCLUSIVE_RO    3
+extern int segment_load (char *name,int segtype,unsigned long *addr,unsigned long *length);
+extern void segment_unload(char *name);
+extern void segment_replace(char *name);
+#endif
+#endif