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https://github.com/torvalds/linux
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9fec9f8ea5
Currently deflate and inflate both use a common state struct. There are several variables in this struct that we don't need for inflate, and more may be coming in the future. Therefore split them in two separate structs. Apart from that, introduce separate headers for dfltcc_deflate and dfltcc_inflate. This commit is based on: https://github.com/zlib-ng/zlib-ng/commit/c592b1b Link: https://lkml.kernel.org/r/20230126131428.1222214-7-zaslonko@linux.ibm.com Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
// SPDX-License-Identifier: Zlib
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#ifndef DFLTCC_H
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#define DFLTCC_H
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#include "../zlib_deflate/defutil.h"
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#include <asm/facility.h>
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#include <asm/setup.h>
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/*
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* Tuning parameters.
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*/
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#define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */
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#define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */
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#define DFLTCC_BLOCK_SIZE 1048576
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#define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096
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#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096
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#define DFLTCC_RIBM 0
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#define DFLTCC_FACILITY 151
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/*
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* Parameter Block for Query Available Functions.
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*/
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struct dfltcc_qaf_param {
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char fns[16];
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char reserved1[8];
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char fmts[2];
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char reserved2[6];
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};
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static_assert(sizeof(struct dfltcc_qaf_param) == 32);
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#define DFLTCC_FMT0 0
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/*
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* Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.
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*/
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struct dfltcc_param_v0 {
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uint16_t pbvn; /* Parameter-Block-Version Number */
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uint8_t mvn; /* Model-Version Number */
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uint8_t ribm; /* Reserved for IBM use */
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unsigned reserved32 : 31;
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unsigned cf : 1; /* Continuation Flag */
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uint8_t reserved64[8];
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unsigned nt : 1; /* New Task */
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unsigned reserved129 : 1;
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unsigned cvt : 1; /* Check Value Type */
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unsigned reserved131 : 1;
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unsigned htt : 1; /* Huffman-Table Type */
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unsigned bcf : 1; /* Block-Continuation Flag */
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unsigned bcc : 1; /* Block Closing Control */
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unsigned bhf : 1; /* Block Header Final */
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unsigned reserved136 : 1;
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unsigned reserved137 : 1;
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unsigned dhtgc : 1; /* DHT Generation Control */
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unsigned reserved139 : 5;
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unsigned reserved144 : 5;
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unsigned sbb : 3; /* Sub-Byte Boundary */
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uint8_t oesc; /* Operation-Ending-Supplemental Code */
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unsigned reserved160 : 12;
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unsigned ifs : 4; /* Incomplete-Function Status */
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uint16_t ifl; /* Incomplete-Function Length */
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uint8_t reserved192[8];
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uint8_t reserved256[8];
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uint8_t reserved320[4];
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uint16_t hl; /* History Length */
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unsigned reserved368 : 1;
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uint16_t ho : 15; /* History Offset */
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uint32_t cv; /* Check Value */
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unsigned eobs : 15; /* End-of-block Symbol */
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unsigned reserved431: 1;
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uint8_t eobl : 4; /* End-of-block Length */
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unsigned reserved436 : 12;
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unsigned reserved448 : 4;
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uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table
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Length */
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uint8_t reserved464[6];
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uint8_t cdht[288];
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uint8_t reserved[32];
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uint8_t csb[1152];
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};
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static_assert(sizeof(struct dfltcc_param_v0) == 1536);
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#define CVT_CRC32 0
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#define CVT_ADLER32 1
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#define HTT_FIXED 0
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#define HTT_DYNAMIC 1
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/*
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* Extension of inflate_state and deflate_state for DFLTCC.
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*/
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struct dfltcc_state {
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struct dfltcc_param_v0 param; /* Parameter block */
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struct dfltcc_qaf_param af; /* Available functions */
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char msg[64]; /* Buffer for strm->msg */
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};
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/*
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* Extension of inflate_state and deflate_state for DFLTCC.
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*/
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struct dfltcc_deflate_state {
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struct dfltcc_state common; /* Parameter block */
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uLong level_mask; /* Levels on which to use DFLTCC */
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uLong block_size; /* New block each X bytes */
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uLong block_threshold; /* New block after total_in > X */
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uLong dht_threshold; /* New block only if avail_in >= X */
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};
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#define ALIGN_UP(p, size) (__typeof__(p))(((uintptr_t)(p) + ((size) - 1)) & ~((size) - 1))
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/* Resides right after inflate_state or deflate_state */
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#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((char *)(state) + ALIGN_UP(sizeof(*state), 8)))
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void dfltcc_reset_state(struct dfltcc_state *dfltcc_state);
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static inline int is_dfltcc_enabled(void)
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{
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return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
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test_facility(DFLTCC_FACILITY));
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}
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#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()
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#endif /* DFLTCC_H */
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