drivers/s390/char/sclp_rw.h

   1 /*
   2  * interface to the SCLP-read/write driver
   3  *
   4  * Copyright IBM Corporation 1999, 2009
   5  *
   6  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
   7  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  */
   9
  10 #ifndef __SCLP_RW_H__
  11 #define __SCLP_RW_H__
  12
  13 #include <linux/list.h>
  14
  15 struct mto {
  16         u16 length;
  17         u16 type;
  18         u16 line_type_flags;
  19         u8  alarm_control;
  20         u8  _reserved[3];
  21 } __attribute__((packed));
  22
  23 struct go {
  24         u16 length;
  25         u16 type;
  26         u32 domid;
  27         u8  hhmmss_time[8];
  28         u8  th_time[3];
  29         u8  reserved_0;
  30         u8  dddyyyy_date[7];
  31         u8  _reserved_1;
  32         u16 general_msg_flags;
  33         u8  _reserved_2[10];
  34         u8  originating_system_name[8];
  35         u8  job_guest_name[8];
  36 } __attribute__((packed));
  37
  38 struct mdb_header {
  39         u16 length;
  40         u16 type;
  41         u32 tag;
  42         u32 revision_code;
  43 } __attribute__((packed));
  44
  45 struct mdb {
  46         struct mdb_header header;
  47         struct go go;
  48 } __attribute__((packed));
  49
  50 struct msg_buf {
  51         struct evbuf_header header;
  52         struct mdb mdb;
  53 } __attribute__((packed));
  54
  55 struct write_sccb {
  56         struct sccb_header header;
  57         struct msg_buf msg_buf;
  58 } __attribute__((packed));
  59
  60 /* The number of empty mto buffers that can be contained in a single sccb. */
  61 #define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
  62                         sizeof(struct write_sccb)) / sizeof(struct mto))
  63
  64 /*
  65  * data structure for information about list of SCCBs (only for writing),
  66  * will be located at the end of a SCCBs page
  67  */
  68 struct sclp_buffer {
  69         struct list_head list;          /* list_head for sccb_info chain */
  70         struct sclp_req request;
  71         struct write_sccb *sccb;
  72         char *current_line;
  73         int current_length;
  74         int retry_count;
  75         /* output format settings */
  76         unsigned short columns;
  77         unsigned short htab;
  78         /* statistics about this buffer */
  79         unsigned int mto_char_sum;      /* # chars in sccb */
  80         unsigned int mto_number;        /* # mtos in sccb */
  81         /* Callback that is called after reaching final status. */
  82         void (*callback)(struct sclp_buffer *, int);
  83 };
  84
  85 int sclp_rw_init(void);
  86 struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
  87 void *sclp_unmake_buffer(struct sclp_buffer *);
  88 int sclp_buffer_space(struct sclp_buffer *);
  89 int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
  90 int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
  91 void sclp_set_columns(struct sclp_buffer *, unsigned short);
  92 void sclp_set_htab(struct sclp_buffer *, unsigned short);
  93 int sclp_chars_in_buffer(struct sclp_buffer *);
  94
  95 #ifdef CONFIG_SCLP_CONSOLE
  96 void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
  97 #else
  98 static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { }
  99 #endif
 100
 101 #endif  /* __SCLP_RW_H__ */