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 16 struct mto { 17 u16 length; 18 u16 type; 19 u16 line_type_flags; 20 u8 alarm_control; 21 u8 _reserved[3]; 22 } __attribute__((packed)); 23 24 struct 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 39 struct mdb_header { 40 u16 length; 41 u16 type; 42 u32 tag; 43 u32 revision_code; 44 } __attribute__((packed)); 45 46 struct mdb { 47 struct mdb_header header; 48 struct go go; 49 struct mto mto; 50 } __attribute__((packed)); 51 52 struct 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 */ 65 struct 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 83 int sclp_rw_init(void); 84 struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short); 85 void *sclp_unmake_buffer(struct sclp_buffer *); 86 int sclp_buffer_space(struct sclp_buffer *); 87 int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int); 88 int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int)); 89 void sclp_set_columns(struct sclp_buffer *, unsigned short); 90 void sclp_set_htab(struct sclp_buffer *, unsigned short); 91 int sclp_chars_in_buffer(struct sclp_buffer *); 92 93 #ifdef CONFIG_SCLP_CONSOLE 94 void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event); 95 #else 96 static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { } 97 #endif 98 99 #endif /* __SCLP_RW_H__ */ 100