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authorMikhail Zaslonko <zaslonko@linux.ibm.com>2020-01-31 09:16:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 21:30:40 +0300
commitc65e6815db1c2e28d5554bd99d3a6e522ab599d1 (patch)
tree91f0ab5f78a5042e3ddbe8324b9a6dea53354839 /arch/s390/include/asm/setup.h
parent12619610006371bfc30159937d4546e731d7b297 (diff)
downloadlinux-c65e6815db1c2e28d5554bd99d3a6e522ab599d1.tar.xz
s390/boot: add dfltcc= kernel command line parameter
Add the new kernel command line parameter 'dfltcc=' to configure s390 zlib hardware support. Format: { on | off | def_only | inf_only | always } on: s390 zlib hardware support for compression on level 1 and decompression (default) off: No s390 zlib hardware support def_only: s390 zlib hardware support for deflate only (compression on level 1) inf_only: s390 zlib hardware support for inflate only (decompression) always: Same as 'on' but ignores the selected compression level always using hardware support (used for debugging) Link: http://lkml.kernel.org/r/20200103223334.20669-5-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 'arch/s390/include/asm/setup.h')
-rw-r--r--arch/s390/include/asm/setup.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 69289e99cabd..b241ddb67caf 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -79,6 +79,13 @@ struct parmarea {
char command_line[ARCH_COMMAND_LINE_SIZE]; /* 0x10480 */
};
+extern unsigned int zlib_dfltcc_support;
+#define ZLIB_DFLTCC_DISABLED 0
+#define ZLIB_DFLTCC_FULL 1
+#define ZLIB_DFLTCC_DEFLATE_ONLY 2
+#define ZLIB_DFLTCC_INFLATE_ONLY 3
+#define ZLIB_DFLTCC_FULL_DEBUG 4
+
extern int noexec_disabled;
extern int memory_end_set;
extern unsigned long memory_end;