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The SCLP base driver defines a new notifier call back for all upper level SCLP drivers, like the SCLP console, etc. This guarantees that in suspend first the upper level drivers are suspended and afterwards the SCLP base driver. For resume it is the other way round. The SCLP base driver itself registers a new platform device at the platform bus and gets PM notifications via the dev_pm_ops. In suspend, the SCLP base driver switches off the receiver and sender mask This is done in sclp_deactivate(). After suspend all new requests will be rejected with -EIO and no more interrupts will be received, because the masks are switched off. For resume the sender and receiver masks are reset in the sclp_reactivate() function. When the SCLP console is suspended, all new messages are cached in the sclp console buffers. In resume, all the cached messages are written to the console. In addition to that we have an early resume function that removes the cached messages from the suspend image. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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* interface to the SCLP-read/write driver
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*
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* Copyright IBM Corporation 1999, 2009
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*
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* Author(s): Martin Peschke <mpeschke@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __SCLP_RW_H__
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#define __SCLP_RW_H__
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#include <linux/list.h>
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struct mto {
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u16 length;
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u16 type;
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u16 line_type_flags;
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u8 alarm_control;
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u8 _reserved[3];
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} __attribute__((packed));
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struct go {
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u16 length;
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u16 type;
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u32 domid;
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u8 hhmmss_time[8];
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u8 th_time[3];
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u8 reserved_0;
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u8 dddyyyy_date[7];
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u8 _reserved_1;
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u16 general_msg_flags;
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u8 _reserved_2[10];
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u8 originating_system_name[8];
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u8 job_guest_name[8];
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} __attribute__((packed));
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struct mdb_header {
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u16 length;
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u16 type;
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u32 tag;
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u32 revision_code;
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} __attribute__((packed));
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struct mdb {
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struct mdb_header header;
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struct go go;
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} __attribute__((packed));
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struct msg_buf {
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struct evbuf_header header;
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struct mdb mdb;
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} __attribute__((packed));
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struct write_sccb {
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struct sccb_header header;
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struct msg_buf msg_buf;
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} __attribute__((packed));
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/* The number of empty mto buffers that can be contained in a single sccb. */
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#define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
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sizeof(struct write_sccb)) / sizeof(struct mto))
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/*
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* data structure for information about list of SCCBs (only for writing),
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* will be located at the end of a SCCBs page
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*/
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struct sclp_buffer {
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struct list_head list; /* list_head for sccb_info chain */
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struct sclp_req request;
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struct write_sccb *sccb;
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char *current_line;
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int current_length;
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int retry_count;
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/* output format settings */
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unsigned short columns;
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unsigned short htab;
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/* statistics about this buffer */
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unsigned int mto_char_sum; /* # chars in sccb */
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unsigned int mto_number; /* # mtos in sccb */
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/* Callback that is called after reaching final status. */
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void (*callback)(struct sclp_buffer *, int);
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};
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int sclp_rw_init(void);
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struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
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void *sclp_unmake_buffer(struct sclp_buffer *);
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int sclp_buffer_space(struct sclp_buffer *);
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int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
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int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
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void sclp_set_columns(struct sclp_buffer *, unsigned short);
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void sclp_set_htab(struct sclp_buffer *, unsigned short);
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int sclp_chars_in_buffer(struct sclp_buffer *);
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void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
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#endif /* __SCLP_RW_H__ */
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