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kernel/linux-imx6_3.14.28/drivers/s390/char/vmur.h 2.96 KB
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  /*
   * 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_SYSTEM_HOLD	0x04
  #define FLG_CP_DUMP	0x10
  #define FLG_USER_HOLD	0x20
  #define FLG_IN_USE	0x80
  
  /*
   * 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 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 */
  	atomic_t ref_count;		/* reference counter */
  	wait_queue_head_t wait;		/* wait queue to serialize open */
  	int open_flag;			/* "urdev is open" flag */
  	spinlock_t open_lock;		/* serialize critical sections */
  };
  
  /*
   * 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_ */