drivers/s390/char/vmur.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linux driver for System z and s390 unit record devices
   4  * (z/VM virtual punch, reader, printer)
   5  *
   6  * Copyright IBM Corp. 2001, 2007
   7  * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
   8  *          Michael Holzheu <holzheu@de.ibm.com>
   9  *          Frank Munzert <munzert@de.ibm.com>
  10  */
  11
  12 #ifndef _VMUR_H_
  13 #define _VMUR_H_
  14
  15 #define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */
  16 #define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */
  17 /*
  18  * we only support z/VM's default unit record devices:
  19  * both in SPOOL directory control statement and in CP DEFINE statement
  20  *      RDR defaults to 2540 reader
  21  *      PUN defaults to 2540 punch
  22  *      PRT defaults to 1403 printer
  23  */
  24 #define READER_PUNCH_DEVTYPE    0x2540
  25 #define PRINTER_DEVTYPE         0x1403
  26
  27 /* z/VM spool file control block SFBLOK */
  28 struct file_control_block {
  29         char reserved_1[8];
  30         char user_owner[8];
  31         char user_orig[8];
  32         __s32 data_recs;
  33         __s16 rec_len;
  34         __s16 file_num;
  35         __u8  file_stat;
  36         __u8  dev_type;
  37         char  reserved_2[6];
  38         char  file_name[12];
  39         char  file_type[12];
  40         char  create_date[8];
  41         char  create_time[8];
  42         char  reserved_3[6];
  43         __u8  file_class;
  44         __u8  sfb_lok;
  45         __u64 distr_code;
  46         __u32 reserved_4;
  47         __u8  current_starting_copy_number;
  48         __u8  sfblock_cntrl_flags;
  49         __u8  reserved_5;
  50         __u8  more_status_flags;
  51         char  rest[200];
  52 } __attribute__ ((packed));
  53
  54 #define FLG_SYSTEM_HOLD 0x04
  55 #define FLG_CP_DUMP     0x10
  56 #define FLG_USER_HOLD   0x20
  57 #define FLG_IN_USE      0x80
  58
  59 /*
  60  * A struct urdev is created for each ur device that is made available
  61  * via the ccw_device driver model.
  62  */
  63 struct urdev {
  64         struct ccw_device *cdev;        /* Backpointer to ccw device */
  65         struct mutex io_mutex;          /* Serialises device IO */
  66         struct completion *io_done;     /* do_ur_io waits; irq completes */
  67         struct device *device;
  68         struct cdev *char_device;
  69         struct ccw_dev_id dev_id;       /* device id */
  70         size_t reclen;                  /* Record length for *write* CCWs */
  71         int class;                      /* VM device class */
  72         int io_request_rc;              /* return code from I/O request */
  73         atomic_t ref_count;             /* reference counter */
  74         wait_queue_head_t wait;         /* wait queue to serialize open */
  75         int open_flag;                  /* "urdev is open" flag */
  76         spinlock_t open_lock;           /* serialize critical sections */
  77 };
  78
  79 /*
  80  * A struct urfile is allocated at open() time for each device and
  81  * freed on release().
  82  */
  83 struct urfile {
  84         struct urdev *urd;
  85         unsigned int flags;
  86         size_t dev_reclen;
  87         __u16 file_reclen;
  88 };
  89
  90 /*
  91  * Device major/minor definitions.
  92  */
  93
  94 #define UR_MAJOR 0      /* get dynamic major */
  95 /*
  96  * We map minor numbers directly to device numbers (0-FFFF) for simplicity.
  97  * This avoids having to allocate (and manage) slot numbers.
  98  */
  99 #define NUM_MINORS 65536
 100
 101 /* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */
 102 #define MAX_RECS_PER_IO         511
 103 #define WRITE_CCW_CMD           0x01
 104
 105 #define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x)
 106 #define CCWDEV_CU_DI(cutype, di) \
 107                 CCW_DEVICE(cutype, 0x00), .driver_info = (di)
 108
 109 #define FILE_RECLEN_OFFSET      4064 /* reclen offset in spool data block */
 110
 111 #endif /* _VMUR_H_ */