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authorMikhail Zaslonko <zaslonko@linux.ibm.com>2020-01-30 22:16:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 10:30:40 -0800
commit803521b149c8c71a712445a32bd9316e074df76a (patch)
tree6a739818beeedb2cdea05dbcc083eb8013989442 /lib/zlib_dfltcc/dfltcc.h
parentc65e6815db1c2e28d5554bd99d3a6e522ab599d1 (diff)
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>
Diffstat (limited to 'lib/zlib_dfltcc/dfltcc.h')
-rw-r--r--lib/zlib_dfltcc/dfltcc.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/zlib_dfltcc/dfltcc.h b/lib/zlib_dfltcc/dfltcc.h
index be70c807b62f..2a2fac1d050a 100644
--- a/lib/zlib_dfltcc/dfltcc.h
+++ b/lib/zlib_dfltcc/dfltcc.h
@@ -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))