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 #include <linux/refcount.h> 16 17 #define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */ 18 #define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */ 19 /* 20 * we only support z/VM's default unit record devices: 21 * both in SPOOL directory control statement and in CP DEFINE statement 22 * RDR defaults to 2540 reader 23 * PUN defaults to 2540 punch 24 * PRT defaults to 1403 printer 25 */ 26 #define READER_PUNCH_DEVTYPE 0x2540 27 #define PRINTER_DEVTYPE 0x1403 28 29 /* z/VM spool file control block SFBLOK */ 30 struct file_control_block { 31 char reserved_1[8]; 32 char user_owner[8]; 33 char user_orig[8]; 34 __s32 data_recs; 35 __s16 rec_len; 36 __s16 file_num; 37 __u8 file_stat; 38 __u8 dev_type; 39 char reserved_2[6]; 40 char file_name[12]; 41 char file_type[12]; 42 char create_date[8]; 43 char create_time[8]; 44 char reserved_3[6]; 45 __u8 file_class; 46 __u8 sfb_lok; 47 __u64 distr_code; 48 __u32 reserved_4; 49 __u8 current_starting_copy_number; 50 __u8 sfblock_cntrl_flags; 51 __u8 reserved_5; 52 __u8 more_status_flags; 53 char rest[200]; 54 } __attribute__ ((packed)); 55 56 #define FLG_SYSTEM_HOLD 0x04 57 #define FLG_CP_DUMP 0x10 58 #define FLG_USER_HOLD 0x20 59 #define FLG_IN_USE 0x80 60 61 /* 62 * A struct urdev is created for each ur device that is made available 63 * via the ccw_device driver model. 64 */ 65 struct urdev { 66 struct ccw_device *cdev; /* Backpointer to ccw device */ 67 struct mutex io_mutex; /* Serialises device IO */ 68 struct completion *io_done; /* do_ur_io waits; irq completes */ 69 struct device *device; 70 struct cdev *char_device; 71 struct ccw_dev_id dev_id; /* device id */ 72 size_t reclen; /* Record length for *write* CCWs */ 73 int class; /* VM device class */ 74 int io_request_rc; /* return code from I/O request */ 75 refcount_t ref_count; /* reference counter */ 76 wait_queue_head_t wait; /* wait queue to serialize open */ 77 int open_flag; /* "urdev is open" flag */ 78 spinlock_t open_lock; /* serialize critical sections */ 79 }; 80 81 /* 82 * A struct urfile is allocated at open() time for each device and 83 * freed on release(). 84 */ 85 struct urfile { 86 struct urdev *urd; 87 unsigned int flags; 88 size_t dev_reclen; 89 __u16 file_reclen; 90 }; 91 92 /* 93 * Device major/minor definitions. 94 */ 95 96 #define UR_MAJOR 0 /* get dynamic major */ 97 /* 98 * We map minor numbers directly to device numbers (0-FFFF) for simplicity. 99 * This avoids having to allocate (and manage) slot numbers. 100 */ 101 #define NUM_MINORS 65536 102 103 /* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */ 104 #define MAX_RECS_PER_IO 511 105 #define WRITE_CCW_CMD 0x01 106 107 #define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x) 108 #define CCWDEV_CU_DI(cutype, di) \ 109 CCW_DEVICE(cutype, 0x00), .driver_info = (di) 110 111 #define FILE_RECLEN_OFFSET 4064 /* reclen offset in spool data block */ 112 113 #endif /* _VMUR_H_ */ 114