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IBM zSystems DFLTCC: Inline DLFTCC states into zlib states
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Currently DFLTCC states are allocated using hook macros, complicating
memory management. Inline them into zlib states and remove the hooks.
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@iii-i
iii-i committed May 2, 2024
1 parent cd72138 commit 1d657c0
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Showing 13 changed files with 129 additions and 157 deletions.
9 changes: 4 additions & 5 deletions arch/s390/README.md
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Expand Up @@ -61,11 +61,10 @@ integrated with the rest of zlib-ng using hook macros.
## Hook macros

DFLTCC takes as arguments a parameter block, an input buffer, an output
buffer and a window. `ZALLOC_DEFLATE_STATE()`, `ZALLOC_INFLATE_STATE()`,
`ZFREE_STATE()`, `ZCOPY_DEFLATE_STATE()`, `ZCOPY_INFLATE_STATE()`,
`ZALLOC_WINDOW()`, `ZCOPY_WINDOW()` and `TRY_FREE_WINDOW()` macros encapsulate
allocation details for the parameter block (which is allocated alongside
zlib-ng state) and the window (which must be page-aligned and large enough).
buffer, and a window. Parameter blocks are stored alongside zlib states;
buffers are forwarded from the caller; and window (which must be page-aligned)
is managed using `ZALLOC_WINDOW()`, `ZCOPY_WINDOW()` and `TRY_FREE_WINDOW()`
macros.

Software and hardware window formats do not match, therefore,
`deflateSetDictionary()`, `deflateGetDictionary()`, `inflateSetDictionary()`
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82 changes: 80 additions & 2 deletions arch/s390/dfltcc_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,90 @@

#include "zutil.h"

/*
Parameter Block for Query Available Functions.
*/
struct dfltcc_qaf_param {
char fns[16];
char reserved1[8];
char fmts[2];
char reserved2[6];
} ALIGNED_(8);

/*
Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.
*/
struct dfltcc_param_v0 {
uint16_t pbvn; /* Parameter-Block-Version Number */
uint8_t mvn; /* Model-Version Number */
uint8_t ribm; /* Reserved for IBM use */
uint32_t reserved32 : 31;
uint32_t cf : 1; /* Continuation Flag */
uint8_t reserved64[8];
uint32_t nt : 1; /* New Task */
uint32_t reserved129 : 1;
uint32_t cvt : 1; /* Check Value Type */
uint32_t reserved131 : 1;
uint32_t htt : 1; /* Huffman-Table Type */
uint32_t bcf : 1; /* Block-Continuation Flag */
uint32_t bcc : 1; /* Block Closing Control */
uint32_t bhf : 1; /* Block Header Final */
uint32_t reserved136 : 1;
uint32_t reserved137 : 1;
uint32_t dhtgc : 1; /* DHT Generation Control */
uint32_t reserved139 : 5;
uint32_t reserved144 : 5;
uint32_t sbb : 3; /* Sub-Byte Boundary */
uint8_t oesc; /* Operation-Ending-Supplemental Code */
uint32_t reserved160 : 12;
uint32_t ifs : 4; /* Incomplete-Function Status */
uint16_t ifl; /* Incomplete-Function Length */
uint8_t reserved192[8];
uint8_t reserved256[8];
uint8_t reserved320[4];
uint16_t hl; /* History Length */
uint32_t reserved368 : 1;
uint16_t ho : 15; /* History Offset */
uint32_t cv; /* Check Value */
uint32_t eobs : 15; /* End-of-block Symbol */
uint32_t reserved431: 1;
uint8_t eobl : 4; /* End-of-block Length */
uint32_t reserved436 : 12;
uint32_t reserved448 : 4;
uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table
Length */
uint8_t reserved464[6];
uint8_t cdht[288]; /* Compressed-Dynamic-Huffman Table */
uint8_t reserved[24];
uint8_t ribm2[8]; /* Reserved for IBM use */
uint8_t csb[1152]; /* Continuation-State Buffer */
} ALIGNED_(8);

/*
Extension of inflate_state and deflate_state.
*/
struct dfltcc_state {
struct dfltcc_param_v0 param; /* Parameter block. */
struct dfltcc_qaf_param af; /* Available functions. */
char msg[64]; /* Buffer for strm->msg */
};

typedef struct {
struct dfltcc_state common;
uint16_t level_mask; /* Levels on which to use DFLTCC */
uint32_t block_size; /* New block each X bytes */
size_t block_threshold; /* New block after total_in > X */
uint32_t dht_threshold; /* New block only if avail_in >= X */
} arch_deflate_state;

typedef struct {
struct dfltcc_state common;
} arch_inflate_state;

void Z_INTERNAL *PREFIX(dfltcc_alloc_window)(PREFIX3(streamp) strm, uInt items, uInt size);
void Z_INTERNAL PREFIX(dfltcc_copy_window)(void *dest, const void *src, size_t n);
void Z_INTERNAL PREFIX(dfltcc_free_window)(PREFIX3(streamp) strm, void *w);

#define ZFREE_STATE ZFREE

#define ZALLOC_WINDOW PREFIX(dfltcc_alloc_window)

#define ZCOPY_WINDOW PREFIX(dfltcc_copy_window)
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39 changes: 9 additions & 30 deletions arch/s390/dfltcc_deflate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,23 +19,9 @@
#include "dfltcc_deflate.h"
#include "dfltcc_detail.h"

struct dfltcc_deflate_state {
struct dfltcc_state common;
uint16_t level_mask; /* Levels on which to use DFLTCC */
uint32_t block_size; /* New block each X bytes */
size_t block_threshold; /* New block after total_in > X */
uint32_t dht_threshold; /* New block only if avail_in >= X */
};

#define GET_DFLTCC_DEFLATE_STATE(state) ((struct dfltcc_deflate_state *)GET_DFLTCC_STATE(state))

void Z_INTERNAL *PREFIX(dfltcc_alloc_deflate_state)(PREFIX3(streamp) strm) {
return dfltcc_alloc_state(strm, sizeof(deflate_state), sizeof(struct dfltcc_deflate_state));
}

void Z_INTERNAL PREFIX(dfltcc_reset_deflate_state)(PREFIX3(streamp) strm) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_deflate_state *dfltcc_state = GET_DFLTCC_DEFLATE_STATE(state);
arch_deflate_state *dfltcc_state = &state->arch;

dfltcc_reset_state(&dfltcc_state->common);

Expand All @@ -46,14 +32,10 @@ void Z_INTERNAL PREFIX(dfltcc_reset_deflate_state)(PREFIX3(streamp) strm) {
dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
}

void Z_INTERNAL PREFIX(dfltcc_copy_deflate_state)(void *dst, const void *src) {
dfltcc_copy_state(dst, src, sizeof(deflate_state), sizeof(struct dfltcc_deflate_state));
}

static inline int dfltcc_can_deflate_with_params(PREFIX3(streamp) strm, int level, uInt window_bits, int strategy,
int reproducible) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_deflate_state *dfltcc_state = GET_DFLTCC_DEFLATE_STATE(state);
arch_deflate_state *dfltcc_state = &state->arch;

/* Unsupported compression settings */
if ((dfltcc_state->level_mask & (1 << level)) == 0)
Expand Down Expand Up @@ -82,15 +64,15 @@ int Z_INTERNAL PREFIX(dfltcc_can_deflate)(PREFIX3(streamp) strm) {

static inline void dfltcc_gdht(PREFIX3(streamp) strm) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;
size_t avail_in = strm->avail_in;

dfltcc(DFLTCC_GDHT, param, NULL, NULL, &strm->next_in, &avail_in, NULL);
}

static inline dfltcc_cc dfltcc_cmpr(PREFIX3(streamp) strm) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;
size_t avail_in = strm->avail_in;
size_t avail_out = strm->avail_out;
dfltcc_cc cc;
Expand Down Expand Up @@ -127,7 +109,7 @@ static inline void send_eobs(PREFIX3(streamp) strm, const struct dfltcc_param_v0

int Z_INTERNAL PREFIX(dfltcc_deflate)(PREFIX3(streamp) strm, int flush, block_state *result) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_deflate_state *dfltcc_state = GET_DFLTCC_DEFLATE_STATE(state);
arch_deflate_state *dfltcc_state = &state->arch;
struct dfltcc_param_v0 *param = &dfltcc_state->common.param;
uInt masked_avail_in;
dfltcc_cc cc;
Expand Down Expand Up @@ -328,7 +310,7 @@ int Z_INTERNAL PREFIX(dfltcc_deflate)(PREFIX3(streamp) strm, int flush, block_st
*/
static int dfltcc_was_deflate_used(PREFIX3(streamp) strm) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;

return strm->total_in > 0 || param->nt == 0 || param->hl > 0;
}
Expand All @@ -353,8 +335,7 @@ int Z_INTERNAL PREFIX(dfltcc_deflate_params)(PREFIX3(streamp) strm, int level, i

int Z_INTERNAL PREFIX(dfltcc_deflate_done)(PREFIX3(streamp) strm, int flush) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
struct dfltcc_param_v0 *param = &dfltcc_state->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;

/* When deflate(Z_FULL_FLUSH) is called with small avail_out, it might
* close the block without resetting the compression state. Detect this
Expand Down Expand Up @@ -382,8 +363,7 @@ int Z_INTERNAL PREFIX(dfltcc_can_set_reproducible)(PREFIX3(streamp) strm, int re
int Z_INTERNAL PREFIX(dfltcc_deflate_set_dictionary)(PREFIX3(streamp) strm,
const unsigned char *dictionary, uInt dict_length) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
struct dfltcc_param_v0 *param = &dfltcc_state->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;

append_history(param, state->window, dictionary, dict_length);
state->strstart = 1; /* Add FDICT to zlib header */
Expand All @@ -393,8 +373,7 @@ int Z_INTERNAL PREFIX(dfltcc_deflate_set_dictionary)(PREFIX3(streamp) strm,

int Z_INTERNAL PREFIX(dfltcc_deflate_get_dictionary)(PREFIX3(streamp) strm, unsigned char *dictionary, uInt *dict_length) {
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
struct dfltcc_param_v0 *param = &dfltcc_state->param;
struct dfltcc_param_v0 *param = &state->arch.common.param;

if (dictionary)
get_history(param, state->window, dictionary);
Expand Down
6 changes: 1 addition & 5 deletions arch/s390/dfltcc_deflate.h
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Original file line number Diff line number Diff line change
@@ -1,11 +1,10 @@
#ifndef DFLTCC_DEFLATE_H
#define DFLTCC_DEFLATE_H

#include "deflate.h"
#include "dfltcc_common.h"

void Z_INTERNAL *PREFIX(dfltcc_alloc_deflate_state)(PREFIX3(streamp));
void Z_INTERNAL PREFIX(dfltcc_reset_deflate_state)(PREFIX3(streamp));
void Z_INTERNAL PREFIX(dfltcc_copy_deflate_state)(void *dst, const void *src);
int Z_INTERNAL PREFIX(dfltcc_can_deflate)(PREFIX3(streamp) strm);
int Z_INTERNAL PREFIX(dfltcc_deflate)(PREFIX3(streamp) strm, int flush, block_state *result);
int Z_INTERNAL PREFIX(dfltcc_deflate_params)(PREFIX3(streamp) strm, int level, int strategy, int *flush);
Expand All @@ -15,9 +14,6 @@ int Z_INTERNAL PREFIX(dfltcc_deflate_set_dictionary)(PREFIX3(streamp) strm,
const unsigned char *dictionary, uInt dict_length);
int Z_INTERNAL PREFIX(dfltcc_deflate_get_dictionary)(PREFIX3(streamp) strm, unsigned char *dictionary, uInt* dict_length);

#define ZALLOC_DEFLATE_STATE PREFIX(dfltcc_alloc_deflate_state)
#define ZCOPY_DEFLATE_STATE PREFIX(dfltcc_copy_deflate_state)

#define DEFLATE_SET_DICTIONARY_HOOK(strm, dict, dict_len) \
do { \
if (PREFIX(dfltcc_can_deflate)((strm))) \
Expand Down
70 changes: 0 additions & 70 deletions arch/s390/dfltcc_detail.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,18 +24,8 @@
#define DFLTCC_RIBM 0
#endif

/*
Parameter Block for Query Available Functions.
*/
#define static_assert(c, msg) __attribute__((unused)) static char static_assert_failed_ ## msg[c ? 1 : -1]

struct dfltcc_qaf_param {
char fns[16];
char reserved1[8];
char fmts[2];
char reserved2[6];
};

#define DFLTCC_SIZEOF_QAF 32
static_assert(sizeof(struct dfltcc_qaf_param) == DFLTCC_SIZEOF_QAF, qaf);

Expand Down Expand Up @@ -74,60 +64,11 @@ static inline int is_dfltcc_enabled(void) {

#define DFLTCC_FMT0 0

/*
Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.
*/
#define CVT_CRC32 0
#define CVT_ADLER32 1
#define HTT_FIXED 0
#define HTT_DYNAMIC 1

struct dfltcc_param_v0 {
uint16_t pbvn; /* Parameter-Block-Version Number */
uint8_t mvn; /* Model-Version Number */
uint8_t ribm; /* Reserved for IBM use */
uint32_t reserved32 : 31;
uint32_t cf : 1; /* Continuation Flag */
uint8_t reserved64[8];
uint32_t nt : 1; /* New Task */
uint32_t reserved129 : 1;
uint32_t cvt : 1; /* Check Value Type */
uint32_t reserved131 : 1;
uint32_t htt : 1; /* Huffman-Table Type */
uint32_t bcf : 1; /* Block-Continuation Flag */
uint32_t bcc : 1; /* Block Closing Control */
uint32_t bhf : 1; /* Block Header Final */
uint32_t reserved136 : 1;
uint32_t reserved137 : 1;
uint32_t dhtgc : 1; /* DHT Generation Control */
uint32_t reserved139 : 5;
uint32_t reserved144 : 5;
uint32_t sbb : 3; /* Sub-Byte Boundary */
uint8_t oesc; /* Operation-Ending-Supplemental Code */
uint32_t reserved160 : 12;
uint32_t ifs : 4; /* Incomplete-Function Status */
uint16_t ifl; /* Incomplete-Function Length */
uint8_t reserved192[8];
uint8_t reserved256[8];
uint8_t reserved320[4];
uint16_t hl; /* History Length */
uint32_t reserved368 : 1;
uint16_t ho : 15; /* History Offset */
uint32_t cv; /* Check Value */
uint32_t eobs : 15; /* End-of-block Symbol */
uint32_t reserved431: 1;
uint8_t eobl : 4; /* End-of-block Length */
uint32_t reserved436 : 12;
uint32_t reserved448 : 4;
uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table
Length */
uint8_t reserved464[6];
uint8_t cdht[288]; /* Compressed-Dynamic-Huffman Table */
uint8_t reserved[24];
uint8_t ribm2[8]; /* Reserved for IBM use */
uint8_t csb[1152]; /* Continuation-State Buffer */
};

#define DFLTCC_SIZEOF_GDHT_V0 384
#define DFLTCC_SIZEOF_CMPR_XPND_V0 1536
static_assert(offsetof(struct dfltcc_param_v0, csb) == DFLTCC_SIZEOF_GDHT_V0, gdht_v0);
Expand Down Expand Up @@ -229,19 +170,8 @@ static inline dfltcc_cc dfltcc(int fn, void *param,
return (cc >> 28) & 3;
}

/*
Extension of inflate_state and deflate_state. Must be doubleword-aligned.
*/
struct dfltcc_state {
struct dfltcc_param_v0 param; /* Parameter block. */
struct dfltcc_qaf_param af; /* Available functions. */
char msg[64]; /* Buffer for strm->msg */
};

#define ALIGN_UP(p, size) (__typeof__(p))(((uintptr_t)(p) + ((size) - 1)) & ~((size) - 1))

#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((char *)(state) + ALIGN_UP(sizeof(*state), 8)))

static inline void *dfltcc_alloc_state(PREFIX3(streamp) strm, uInt size, uInt extension_size) {
return ZALLOC(strm, 1, ALIGN_UP(size, 8) + extension_size);
}
Expand Down
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