[S390] z/VM unit record device driver

z/VM Unit record character device driver to access VM reader, punch,
and printer.
Signed-off-by: Frank Munzert <munzert@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/defconfig

@@ -512,6 +512,7 @@ CONFIG_S390_TAPE_34XX=m
 # CONFIG_VMCP is not set
 # CONFIG_MONREADER is not set
 CONFIG_MONWRITER=m
+CONFIG_S390_VMUR=m
 # CONFIG_POWER_SUPPLY is not set
 
 #

drivers/s390/char/Kconfig

@@ -164,3 +164,9 @@ config MONWRITER
 	help
 	  Character device driver for writing z/VM monitor service records
 
+config S390_VMUR
+	tristate "z/VM unit record device driver"
+	default "m"
+	help
+	  Character device driver for z/VM reader, puncher and printer.
+

drivers/s390/char/Makefile

@@ -29,6 +29,7 @@ obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o
 obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o
 obj-$(CONFIG_MONREADER) += monreader.o
 obj-$(CONFIG_MONWRITER) += monwriter.o
+obj-$(CONFIG_S390_VMUR) += vmur.o
 
 zcore_mod-objs := sclp_sdias.o zcore.o
 obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o

drivers/s390/char/vmur.h

+/*
+ * Linux driver for System z and s390 unit record devices
+ * (z/VM virtual punch, reader, printer)
+ *
+ * Copyright IBM Corp. 2001, 2007
+ * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
+ *	    Michael Holzheu <holzheu@de.ibm.com>
+ *	    Frank Munzert <munzert@de.ibm.com>
+ */
+
+#ifndef _VMUR_H_
+#define _VMUR_H_
+
+#define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */
+#define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */
+/*
+ * we only support z/VM's default unit record devices:
+ * both in SPOOL directory control statement and in CP DEFINE statement
+ *	RDR defaults to 2540 reader
+ *	PUN defaults to 2540 punch
+ *	PRT defaults to 1403 printer
+ */
+#define READER_PUNCH_DEVTYPE	0x2540
+#define PRINTER_DEVTYPE		0x1403
+
+/* z/VM spool file control block SFBLOK */
+struct file_control_block {
+	char reserved_1[8];
+	char user_owner[8];
+	char user_orig[8];
+	__s32 data_recs;
+	__s16 rec_len;
+	__s16 file_num;
+	__u8  file_stat;
+	__u8  dev_type;
+	char  reserved_2[6];
+	char  file_name[12];
+	char  file_type[12];
+	char  create_date[8];
+	char  create_time[8];
+	char  reserved_3[6];
+	__u8  file_class;
+	__u8  sfb_lok;
+	__u64 distr_code;
+	__u32 reserved_4;
+	__u8  current_starting_copy_number;
+	__u8  sfblock_cntrl_flags;
+	__u8  reserved_5;
+	__u8  more_status_flags;
+	char  rest[200];
+} __attribute__ ((packed));
+
+#define FLG_CP_DUMP 0x10
+
+/*
+ * A struct urdev is created for each ur device that is made available
+ * via the ccw_device driver model.
+ */
+struct urdev {
+	struct ccw_device *cdev;	/* Backpointer to ccw device */
+	struct mutex io_mutex;		/* Serialises device IO */
+	struct mutex open_mutex;	/* Serialises access to device */
+	struct completion *io_done;	/* do_ur_io waits; irq completes */
+	struct device *device;
+	struct cdev *char_device;
+	struct ccw_dev_id dev_id;	/* device id */
+	size_t reclen;			/* Record length for *write* CCWs */
+	int class;			/* VM device class */
+	int io_request_rc;		/* return code from I/O request */
+};
+
+/*
+ * A struct urfile is allocated at open() time for each device and
+ * freed on release().
+ */
+struct urfile {
+	struct urdev *urd;
+	unsigned int flags;
+	size_t dev_reclen;
+	__u16 file_reclen;
+};
+
+/*
+ * Device major/minor definitions.
+ */
+
+#define UR_MAJOR 0	/* get dynamic major */
+/*
+ * We map minor numbers directly to device numbers (0-FFFF) for simplicity.
+ * This avoids having to allocate (and manage) slot numbers.
+ */
+#define NUM_MINORS 65536
+
+/* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */
+#define MAX_RECS_PER_IO		511
+#define WRITE_CCW_CMD		0x01
+
+#define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x)
+#define CCWDEV_CU_DI(cutype, di) \
+		CCW_DEVICE(cutype, 0x00), .driver_info = (di)
+
+#define FILE_RECLEN_OFFSET	4064 /* reclen offset in spool data block */
+
+#endif /* _VMUR_H_ */