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d53bfb9201
Integrate zlib DFLTCC deflate compression to single volume dasd dumper using the existing s390 extended dump format. Compression takes place only if DFLTCC facility is available, otherwise dump is written uncompressed as before. First megabyte of memory is always written uncompressed and afterwards this area is used for zlib workspace and for the compression output buffer. The compression takes place in chunks of data of equal size (currently 1MB) and the offset of each compressed chunk is stored in the dump segment header. Since existing dump segment headers of 1 page size are used, we need to limit the maximum size of compressed dump segments. Chunk is written uncompressed in case of compression error or if deflate compression only makes it bigger. Thus every chunk of data is compressed separately and can be decompressed independently. The main reason for that is to enable zgetdump to make fast read seeks. Otherwise, zgetdump would need to decompress a big dump segment in the worst case to extract a single piece of data. Put compression related functions and structures to eckd2dump_zlib.c and eckd2dump_zlib.h Update zipl man page with the general information of zlib compression support. Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
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* zipl - zSeries Initial Program Loader tool
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*
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* Common dump functions
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*
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* Copyright IBM Corp. 2013, 2023
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#ifndef STAGE2DUMP_H
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#define STAGE2DUMP_H
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#include "boot/s390.h"
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#include "dump/s390_dump.h"
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#define IPL_SC S390_lowcore.tpi_info.schid
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#define ROUND_DOWN(x, a) ((x) & ~((typeof(x))(a) - 1))
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#define ROUND_UP(x, a) ROUND_DOWN((x) + (typeof(x))(a) - 1, a)
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#define IS_ALIGNED(x, a) ~((x) & ((typeof(x))(a) - 1))
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/*
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* zipl parameters passed at tail of dump tools
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*/
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struct stage2dump_parm_tail {
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char reserved[6];
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uint16_t mvdump_force;
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uint64_t mem_upper_limit;
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} __packed;
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extern struct stage2dump_parm_tail __section(.stage2dump.tail) parm_tail;
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/*
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* Linker script defined symbols
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*/
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extern char __eckd2mvdump_parm_start[];
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extern char __stage2_desc[];
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/*
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* Dump common globals
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*/
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extern struct df_s390_hdr *dump_hdr;
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extern unsigned long total_dump_size;
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/*
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* Common functions
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*/
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void create_ida_list(unsigned long *list, int len, unsigned long addr,
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unsigned long zero_page);
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void init_progress_print(void);
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void progress_print(unsigned long addr);
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void df_s390_em_page_init(unsigned long page);
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void pgm_check_handler(void);
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int is_zero_mb(unsigned long addr);
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unsigned long find_dump_segment(unsigned long start, unsigned long end,
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unsigned long max_len,
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struct df_s390_dump_segm_hdr *dump_segm);
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/*
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* Dump tool backend functions
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*/
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void dt_device_parm_setup(void);
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void dt_device_enable(void);
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void dt_dump_mem(void);
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#endif /* STAGE2DUMP_H */
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