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lib/zlib: add s390 hardware support for kernel zlib_inflate 

Add decompression functions to zlib_dfltcc library.  Update zlib_inflate
functions with the hooks for s390 hardware support and adjust workspace
structures with extra parameter lists required for hardware inflate
decompression.

Link: http://lkml.kernel.org/r/20200103223334.20669-4-zaslonko@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Co-developed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Eduard Shishkin <edward6@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mikhail Zaslonko 2020-01-30 22:16:23 -08:00 committed by Linus Torvalds
parent 1b3e3faf29
commit 1261961000
7 changed files with 233 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
lib/decompress_inflate.c
View File

@ -10,6 +10,10 @@
#include "zlib_inflate/inftrees.c"
#include "zlib_inflate/inffast.c"
#include "zlib_inflate/inflate.c"
#ifdef CONFIG_ZLIB_DFLTCC
#include "zlib_dfltcc/dfltcc.c"
#include "zlib_dfltcc/dfltcc_inflate.c"
#endif
#else /* STATIC */
/* initramfs et al: linked */
@ -76,7 +80,12 @@ STATIC int INIT __gunzip(unsigned char *buf, long len,
}
strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
#ifdef CONFIG_ZLIB_DFLTCC
/* Always allocate the full workspace for DFLTCC */
zlib_inflate_workspacesize());
#else
sizeof(struct inflate_state));
#endif
if (strm->workspace == NULL) {
error("Out of memory while allocating workspace");
goto gunzip_nomem4;
@ -123,10 +132,14 @@ STATIC int INIT __gunzip(unsigned char *buf, long len,
rc = zlib_inflateInit2(strm, -MAX_WBITS);
#ifdef CONFIG_ZLIB_DFLTCC
/* Always keep the window for DFLTCC */
#else
if (!flush) {
WS(strm)->inflate_state.wsize = 0;
WS(strm)->inflate_state.window = NULL;
}
#endif
while (rc == Z_OK) {
if (strm->avail_in == 0) {

2
lib/zlib_dfltcc/Makefile
View File

@ -8,4 +8,4 @@
obj-$(CONFIG_ZLIB_DFLTCC) += zlib_dfltcc.o
zlib_dfltcc-objs := dfltcc.o dfltcc_deflate.o dfltcc_syms.o
zlib_dfltcc-objs := dfltcc.o dfltcc_deflate.o dfltcc_inflate.o dfltcc_syms.o

28
lib/zlib_dfltcc/dfltcc.h
View File

@ -104,6 +104,14 @@ int dfltcc_deflate(z_streamp strm,
int flush,
block_state *result);
void dfltcc_reset(z_streamp strm, uInt size);
int dfltcc_can_inflate(z_streamp strm);
typedef enum {
DFLTCC_INFLATE_CONTINUE,
DFLTCC_INFLATE_BREAK,
DFLTCC_INFLATE_SOFTWARE,
} dfltcc_inflate_action;
dfltcc_inflate_action dfltcc_inflate(z_streamp strm,
int flush, int *ret);
#define DEFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(deflate_state))
@ -112,4 +120,24 @@ void dfltcc_reset(z_streamp strm, uInt size);
#define DEFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_deflate((strm)))
#define INFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(struct inflate_state))
#define INFLATE_TYPEDO_HOOK(strm, flush) \
if (dfltcc_can_inflate((strm))) { \
dfltcc_inflate_action action; \
\
RESTORE(); \
action = dfltcc_inflate((strm), (flush), &ret); \
LOAD(); \
if (action == DFLTCC_INFLATE_CONTINUE) \
break; \
else if (action == DFLTCC_INFLATE_BREAK) \
goto inf_leave; \
}
#define INFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_inflate((strm)))
#define INFLATE_NEED_UPDATEWINDOW(strm) (!dfltcc_can_inflate((strm)))
#endif /* DFLTCC_H */

143
lib/zlib_dfltcc/dfltcc_inflate.c Normal file
View File

@ -0,0 +1,143 @@
// SPDX-License-Identifier: Zlib
#include "../zlib_inflate/inflate.h"
#include "dfltcc_util.h"
#include "dfltcc.h"
#include <linux/zutil.h>
/*
* Expand.
*/
int dfltcc_can_inflate(
z_streamp strm
)
{
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
/* Unsupported compression settings */
if (state->wbits != HB_BITS)
return 0;
/* Unsupported hardware */
return is_bit_set(dfltcc_state->af.fns, DFLTCC_XPND) &&
is_bit_set(dfltcc_state->af.fmts, DFLTCC_FMT0);
}
static int dfltcc_was_inflate_used(
z_streamp strm
)
{
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
return !param->nt;
}
static int dfltcc_inflate_disable(
z_streamp strm
)
{
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
if (!dfltcc_can_inflate(strm))
return 0;
if (dfltcc_was_inflate_used(strm))
/* DFLTCC has already decompressed some data. Since there is not
* enough information to resume decompression in software, the call
* must fail.
*/
return 1;
/* DFLTCC was not used yet - decompress in software */
memset(&dfltcc_state->af, 0, sizeof(dfltcc_state->af));
return 0;
}
static dfltcc_cc dfltcc_xpnd(
z_streamp strm
)
{
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_param_v0 *param = &GET_DFLTCC_STATE(state)->param;
size_t avail_in = strm->avail_in;
size_t avail_out = strm->avail_out;
dfltcc_cc cc;
cc = dfltcc(DFLTCC_XPND | HBT_CIRCULAR,
param, &strm->next_out, &avail_out,
&strm->next_in, &avail_in, state->window);
strm->avail_in = avail_in;
strm->avail_out = avail_out;
return cc;
}
dfltcc_inflate_action dfltcc_inflate(
z_streamp strm,
int flush,
int *ret
)
{
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
struct dfltcc_param_v0 *param = &dfltcc_state->param;
dfltcc_cc cc;
if (flush == Z_BLOCK) {
/* DFLTCC does not support stopping on block boundaries */
if (dfltcc_inflate_disable(strm)) {
*ret = Z_STREAM_ERROR;
return DFLTCC_INFLATE_BREAK;
} else
return DFLTCC_INFLATE_SOFTWARE;
}
if (state->last) {
if (state->bits != 0) {
strm->next_in++;
strm->avail_in--;
state->bits = 0;
}
state->mode = CHECK;
return DFLTCC_INFLATE_CONTINUE;
}
if (strm->avail_in == 0 && !param->cf)
return DFLTCC_INFLATE_BREAK;
if (!state->window || state->wsize == 0) {
state->mode = MEM;
return DFLTCC_INFLATE_CONTINUE;
}
/* Translate stream to parameter block */
param->cvt = CVT_ADLER32;
param->sbb = state->bits;
param->hl = state->whave; /* Software and hardware history formats match */
param->ho = (state->write - state->whave) & ((1 << HB_BITS) - 1);
if (param->hl)
param->nt = 0; /* Honor history for the first block */
param->cv = state->flags ? REVERSE(state->check) : state->check;
/* Inflate */
do {
cc = dfltcc_xpnd(strm);
} while (cc == DFLTCC_CC_AGAIN);
/* Translate parameter block to stream */
strm->msg = oesc_msg(dfltcc_state->msg, param->oesc);
state->last = cc == DFLTCC_CC_OK;
state->bits = param->sbb;
state->whave = param->hl;
state->write = (param->ho + param->hl) & ((1 << HB_BITS) - 1);
state->check = state->flags ? REVERSE(param->cv) : param->cv;
if (cc == DFLTCC_CC_OP2_CORRUPT && param->oesc != 0) {
/* Report an error if stream is corrupted */
state->mode = BAD;
return DFLTCC_INFLATE_CONTINUE;
}
state->mode = TYPEDO;
/* Break if operands are exhausted, otherwise continue looping */
return (cc == DFLTCC_CC_OP1_TOO_SHORT || cc == DFLTCC_CC_OP2_TOO_SHORT) ?
DFLTCC_INFLATE_BREAK : DFLTCC_INFLATE_CONTINUE;
}

32
lib/zlib_inflate/inflate.c
View File

@ -15,6 +15,16 @@
#include "inffast.h"
#include "infutil.h"
/* architecture-specific bits */
#ifdef CONFIG_ZLIB_DFLTCC
# include "../zlib_dfltcc/dfltcc.h"
#else
#define INFLATE_RESET_HOOK(strm) do {} while (0)
#define INFLATE_TYPEDO_HOOK(strm, flush) do {} while (0)
#define INFLATE_NEED_UPDATEWINDOW(strm) 1
#define INFLATE_NEED_CHECKSUM(strm) 1
#endif
int zlib_inflate_workspacesize(void)
{
return sizeof(struct inflate_workspace);
@ -42,6 +52,7 @@ int zlib_inflateReset(z_streamp strm)
state->write = 0;
state->whave = 0;
INFLATE_RESET_HOOK(strm);
return Z_OK;
}
@ -66,7 +77,15 @@ int zlib_inflateInit2(z_streamp strm, int windowBits)
return Z_STREAM_ERROR;
}
state->wbits = (unsigned)windowBits;
#ifdef CONFIG_ZLIB_DFLTCC
/*
* DFLTCC requires the window to be page aligned.
* Thus, we overallocate and take the aligned portion of the buffer.
*/
state->window = PTR_ALIGN(&WS(strm)->working_window[0], PAGE_SIZE);
#else
state->window = &WS(strm)->working_window[0];
#endif
return zlib_inflateReset(strm);
}
@ -227,11 +246,6 @@ static int zlib_inflateSyncPacket(z_streamp strm)
bits -= bits & 7; \
} while (0)
/* Reverse the bytes in a 32-bit value */
#define REVERSE(q) \
((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
/*
inflate() uses a state machine to process as much input data and generate as
much output data as possible before returning. The state machine is
@ -395,6 +409,7 @@ int zlib_inflate(z_streamp strm, int flush)
if (flush == Z_BLOCK) goto inf_leave;
/* fall through */
case TYPEDO:
INFLATE_TYPEDO_HOOK(strm, flush);
if (state->last) {
BYTEBITS();
state->mode = CHECK;
@ -692,7 +707,7 @@ int zlib_inflate(z_streamp strm, int flush)
out -= left;
strm->total_out += out;
state->total += out;
if (out)
if (INFLATE_NEED_CHECKSUM(strm) && out)
strm->adler = state->check =
UPDATE(state->check, put - out, out);
out = left;
@ -726,7 +741,8 @@ int zlib_inflate(z_streamp strm, int flush)
*/
inf_leave:
RESTORE();
if (state->wsize || (state->mode < CHECK && out != strm->avail_out))
if (INFLATE_NEED_UPDATEWINDOW(strm) &&
(state->wsize || (state->mode < CHECK && out != strm->avail_out)))
zlib_updatewindow(strm, out);
in -= strm->avail_in;
@ -734,7 +750,7 @@ int zlib_inflate(z_streamp strm, int flush)
strm->total_in += in;
strm->total_out += out;
state->total += out;
if (state->wrap && out)
if (INFLATE_NEED_CHECKSUM(strm) && state->wrap && out)
strm->adler = state->check =
UPDATE(state->check, strm->next_out - out, out);

8
lib/zlib_inflate/inflate.h
View File

@ -11,6 +11,8 @@
subject to change. Applications should only use zlib.h.
*/
#include "inftrees.h"
/* Possible inflate modes between inflate() calls */
typedef enum {
HEAD, /* i: waiting for magic header */
@ -108,4 +110,10 @@ struct inflate_state {
unsigned short work[288]; /* work area for code table building */
code codes[ENOUGH]; /* space for code tables */
};
/* Reverse the bytes in a 32-bit value */
#define REVERSE(q) \
((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
#endif

18
lib/zlib_inflate/infutil.h
View File

@ -12,14 +12,28 @@
#define _INFUTIL_H
#include <linux/zlib.h>
#ifdef CONFIG_ZLIB_DFLTCC
#include "../zlib_dfltcc/dfltcc.h"
#include <asm/page.h>
#endif
/* memory allocation for inflation */
struct inflate_workspace {
struct inflate_state inflate_state;
unsigned char working_window[1 << MAX_WBITS];
#ifdef CONFIG_ZLIB_DFLTCC
struct dfltcc_state dfltcc_state;
unsigned char working_window[(1 << MAX_WBITS) + PAGE_SIZE];
#else
unsigned char working_window[(1 << MAX_WBITS)];
#endif
};
#define WS(z) ((struct inflate_workspace *)(z->workspace))
#ifdef CONFIG_ZLIB_DFLTCC
/* dfltcc_state must be doubleword aligned for DFLTCC call */
static_assert(offsetof(struct inflate_workspace, dfltcc_state) % 8 == 0);
#endif
#define WS(strm) ((struct inflate_workspace *)(strm->workspace))
#endif