[PATCH] s390: 64 bit diag250 support

Add support for diag 250 access to dasd devices for 64 bit kernels.  In
addition fix detach/attach for diag disks.  The VM control block needs to get
recreated by a call to mdsk_init_io.
Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/s390/block/Kconfig

@@ -49,7 +49,7 @@ config DASD_FBA
 
 config DASD_DIAG
 	tristate "Support for DIAG access to Disks"
-	depends on DASD && ARCH_S390X = 'n'
+	depends on DASD && ( ARCH_S390X = 'n' || EXPERIMENTAL)
 	help
 	  Select this option if you want to use Diagnose250 command to access
 	  Disks under VM.  If you are not running under VM or unsure what it is,

drivers/s390/block/dasd_diag.h

@@ -6,7 +6,7 @@
  * Bugreports.to..: <Linux390@de.ibm.com>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
  *
- * $Revision: 1.6 $
+ * $Revision: 1.7 $
  */
 
 #define MDSK_WRITE_REQ 0x01
@@ -19,6 +19,18 @@
 #define DEV_CLASS_FBA	0x01
 #define DEV_CLASS_ECKD	0x04
 
+#define DASD_DIAG_LC_INT_CODE		132
+#define DASD_DIAG_LC_INT_STATUS		133
+#define DASD_DIAG_LC_INT_PARM_31BIT	128
+#define DASD_DIAG_LC_INT_PARM_64BIT	4536
+#define DASD_DIAG_CODE_31BIT		0x03
+#define DASD_DIAG_CODE_64BIT		0x07
+
+#define DASD_DIAG_RWFLAG_ASYNC		0x02
+#define DASD_DIAG_RWFLAG_NOCACHE	0x01
+
+#define DASD_DIAG_FLAGA_FORMAT_64BIT	0x80
+
 struct dasd_diag_characteristics {
 	u16 dev_nr;
 	u16 rdc_len;
@@ -32,35 +44,106 @@ struct dasd_diag_characteristics {
 	u8 rdev_features;
 } __attribute__ ((packed, aligned(4)));
 
+struct dasd_diag_cms_label {
+	u8 label_id[4];
+	u8 vol_id[6];
+	u16 version_id;
+	u32 block_size;
+	u32 origin_ptr;
+	u32 usable_count;
+	u32 formatted_count;
+	u32 block_count;
+	u32 used_count;
+	u32 fst_size;
+	u32 fst_count;
+	u8 format_date[6];
+	u8 reserved1[2];
+	u32 disk_offset;
+	u32 map_block;
+	u32 hblk_disp;
+	u32 user_disp;
+	u8 reserved2[4];
+	u8 segment_name[8];
+} __attribute__ ((packed));
+
+#ifdef CONFIG_ARCH_S390X
+#define DASD_DIAG_FLAGA_DEFAULT		DASD_DIAG_FLAGA_FORMAT_64BIT
+
+typedef u64 blocknum_t;
+typedef s64 sblocknum_t;
+
+struct dasd_diag_bio {
+	u8 type;
+	u8 status;
+	u8 spare1[2];
+	u32 alet;
+	blocknum_t block_number;
+	u64 buffer;
+} __attribute__ ((packed, aligned(8)));
+
+struct dasd_diag_init_io {
+	u16 dev_nr;
+	u8 flaga;
+	u8 spare1[21];
+	u32 block_size;
+	u8 spare2[4];
+	blocknum_t offset;
+	sblocknum_t start_block;
+	blocknum_t end_block;
+	u8  spare3[8];
+} __attribute__ ((packed, aligned(8)));
+
+struct dasd_diag_rw_io {
+	u16 dev_nr;
+	u8  flaga;
+	u8  spare1[21];
+	u8  key;
+	u8  flags;
+	u8  spare2[2];
+	u32 block_count;
+	u32 alet;
+	u8  spare3[4];
+	u64 interrupt_params;
+	u64 bio_list;
+	u8  spare4[8];
+} __attribute__ ((packed, aligned(8)));
+#else /* CONFIG_ARCH_S390X */
+#define DASD_DIAG_FLAGA_DEFAULT		0x0
+
+typedef u32 blocknum_t;
+typedef s32 sblocknum_t;
+
 struct dasd_diag_bio {
 	u8 type;
 	u8 status;
 	u16 spare1;
-	u32 block_number;
+	blocknum_t block_number;
 	u32 alet;
 	u32 buffer;
 } __attribute__ ((packed, aligned(8)));
 
 struct dasd_diag_init_io {
 	u16 dev_nr;
-	u16 spare1[11];
+	u8 flaga;
+	u8 spare1[21];
 	u32 block_size;
-	u32 offset;
-	u32 start_block;
-	u32 end_block;
-	u32 spare2[6];
+	blocknum_t offset;
+	sblocknum_t start_block;
+	blocknum_t end_block;
+	u8 spare2[24];
 } __attribute__ ((packed, aligned(8)));
 
 struct dasd_diag_rw_io {
 	u16 dev_nr;
-	u16 spare1[11];
+	u8 flaga;
+	u8 spare1[21];
 	u8 key;
 	u8 flags;
-	u16 spare2;
+	u8 spare2[2];
 	u32 block_count;
 	u32 alet;
 	u32 bio_list;
 	u32 interrupt_params;
-	u32 spare3[5];
+	u8 spare3[20];
 } __attribute__ ((packed, aligned(8)));
-
+#endif /* CONFIG_ARCH_S390X */