1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * interface to the SCLP-read/write driver
4 *
5 * Copyright IBM Corporation 1999, 2009
6 *
7 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
8 * Martin Schwidefsky <schwidefsky@de.ibm.com>
9 */
10
11#ifndef __SCLP_RW_H__
12#define __SCLP_RW_H__
13
14#include <linux/list.h>
15
16struct mto {
17 u16 length;
18 u16 type;
19 u16 line_type_flags;
20 u8 alarm_control;
21 u8 _reserved[3];
22} __attribute__((packed));
23
24struct go {
25 u16 length;
26 u16 type;
27 u32 domid;
28 u8 hhmmss_time[8];
29 u8 th_time[3];
30 u8 reserved_0;
31 u8 dddyyyy_date[7];
32 u8 _reserved_1;
33 u16 general_msg_flags;
34 u8 _reserved_2[10];
35 u8 originating_system_name[8];
36 u8 job_guest_name[8];
37} __attribute__((packed));
38
39struct mdb_header {
40 u16 length;
41 u16 type;
42 u32 tag;
43 u32 revision_code;
44} __attribute__((packed));
45
46struct mdb {
47 struct mdb_header header;
48 struct go go;
49 struct mto mto;
50} __attribute__((packed));
51
52struct msg_buf {
53 struct evbuf_header header;
54 struct mdb mdb;
55} __attribute__((packed));
56
57/* The number of empty mto buffers that can be contained in a single sccb. */
58#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
59 sizeof(struct sccb_header)) / sizeof(struct msg_buf))
60
61/*
62 * data structure for information about list of SCCBs (only for writing),
63 * will be located at the end of a SCCBs page
64 */
65struct sclp_buffer {
66 struct list_head list; /* list_head for sccb_info chain */
67 struct sclp_req request;
68 void *sccb;
69 struct msg_buf *current_msg;
70 char *current_line;
71 int current_length;
72 int retry_count;
73 /* output format settings */
74 unsigned short columns;
75 unsigned short htab;
76 /* statistics about this buffer */
77 unsigned int char_sum; /* # chars in sccb */
78 unsigned int messages; /* # messages in sccb */
79 /* Callback that is called after reaching final status. */
80 void (*callback)(struct sclp_buffer *, int);
81};
82
83int sclp_rw_init(void);
84struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
85void *sclp_unmake_buffer(struct sclp_buffer *);
86int sclp_buffer_space(struct sclp_buffer *);
87int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
88int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
89unsigned int sclp_chars_in_buffer(struct sclp_buffer *);
90
91#endif /* __SCLP_RW_H__ */
92

source code of linux/drivers/s390/char/sclp_rw.h