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lib/zlib: add zlib_deflate_dfltcc_enabled() function 

Add a new function to zlib.h checking if s390 Deflate-Conversion
facility is installed and enabled.

Link: http://lkml.kernel.org/r/20200103223334.20669-6-zaslonko@linux.ibm.com
Signed-off-by: Mikhail Zaslonko <zaslonko@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: Ilya Leoshkevich <iii@linux.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 22:16:30 -08:00 committed by Linus Torvalds
parent c65e6815db
commit 803521b149
5 changed files with 24 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/zlib.h
View File

@ -191,6 +191,12 @@ extern int zlib_deflate_workspacesize (int windowBits, int memLevel);
exceed those passed here.
*/
extern int zlib_deflate_dfltcc_enabled (void);
/*
Returns 1 if Deflate-Conversion facility is installed and enabled,
otherwise 0.
*/
/*
extern int deflateInit (z_streamp strm, int level);

6
lib/zlib_deflate/deflate.c
View File

@ -59,6 +59,7 @@
#define DEFLATE_RESET_HOOK(strm) do {} while (0)
#define DEFLATE_HOOK(strm, flush, bstate) 0
#define DEFLATE_NEED_CHECKSUM(strm) 1
#define DEFLATE_DFLTCC_ENABLED() 0
#endif
/* ===========================================================================
@ -1138,3 +1139,8 @@ int zlib_deflate_workspacesize(int windowBits, int memLevel)
+ zlib_deflate_head_memsize(memLevel)
+ zlib_deflate_overlay_memsize(memLevel);
}
int zlib_deflate_dfltcc_enabled(void)
{
return DEFLATE_DFLTCC_ENABLED();
}

1
lib/zlib_deflate/deflate_syms.c
View File

@ -12,6 +12,7 @@
#include <linux/zlib.h>
EXPORT_SYMBOL(zlib_deflate_workspacesize);
EXPORT_SYMBOL(zlib_deflate_dfltcc_enabled);
EXPORT_SYMBOL(zlib_deflate);
EXPORT_SYMBOL(zlib_deflateInit2);
EXPORT_SYMBOL(zlib_deflateEnd);

11
lib/zlib_dfltcc/dfltcc.h
View File

@ -3,6 +3,8 @@
#define DFLTCC_H
#include "../zlib_deflate/defutil.h"
#include <asm/facility.h>
#include <asm/setup.h>
/*
* Tuning parameters.
@ -14,6 +16,8 @@
#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096
#define DFLTCC_RIBM 0
#define DFLTCC_FACILITY 151
/*
* Parameter Block for Query Available Functions.
*/
@ -113,6 +117,11 @@ typedef enum {
} dfltcc_inflate_action;
dfltcc_inflate_action dfltcc_inflate(z_streamp strm,
int flush, int *ret);
static inline int is_dfltcc_enabled(void)
{
return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
test_facility(DFLTCC_FACILITY));
}
#define DEFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(deflate_state))
@ -121,6 +130,8 @@ dfltcc_inflate_action dfltcc_inflate(z_streamp strm,
#define DEFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_deflate((strm)))
#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()
#define INFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(struct inflate_state))

9
lib/zlib_dfltcc/dfltcc_util.h
View File

@ -3,8 +3,6 @@
#define DFLTCC_UTIL_H
#include <linux/zutil.h>
#include <asm/facility.h>
#include <asm/setup.h>
/*
* C wrapper for the DEFLATE CONVERSION CALL instruction.
@ -24,7 +22,6 @@ typedef enum {
#define HBT_CIRCULAR (1 << 7)
#define HB_BITS 15
#define HB_SIZE (1 << HB_BITS)
#define DFLTCC_FACILITY 151
static inline dfltcc_cc dfltcc(
int fn,
@ -101,12 +98,6 @@ static inline int dfltcc_are_params_ok(
(strategy == Z_DEFAULT_STRATEGY);
}
static inline int is_dfltcc_enabled(void)
{
return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
test_facility(DFLTCC_FACILITY));
}
char *oesc_msg(char *buf, int oesc);
#endif /* DFLTCC_UTIL_H */