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authorMikhail Zaslonko <zaslonko@linux.ibm.com>2020-01-30 22:16:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 10:30:40 -0800
commitc65e6815db1c2e28d5554bd99d3a6e522ab599d1 (patch)
tree91f0ab5f78a5042e3ddbe8324b9a6dea53354839 /lib
parent12619610006371bfc30159937d4546e731d7b297 (diff)
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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 'lib')
-rw-r--r--lib/zlib_dfltcc/dfltcc.c5
-rw-r--r--lib/zlib_dfltcc/dfltcc.h1
-rw-r--r--lib/zlib_dfltcc/dfltcc_deflate.c6
-rw-r--r--lib/zlib_dfltcc/dfltcc_inflate.c6
-rw-r--r--lib/zlib_dfltcc/dfltcc_util.h4
5 files changed, 20 insertions, 2 deletions
diff --git a/lib/zlib_dfltcc/dfltcc.c b/lib/zlib_dfltcc/dfltcc.c
index 7f77e5bb01c6..c30de430b30c 100644
--- a/lib/zlib_dfltcc/dfltcc.c
+++ b/lib/zlib_dfltcc/dfltcc.c
@@ -44,7 +44,10 @@ void dfltcc_reset(
dfltcc_state->param.nt = 1;
/* Initialize tuning parameters */
- dfltcc_state->level_mask = DFLTCC_LEVEL_MASK;
+ if (zlib_dfltcc_support == ZLIB_DFLTCC_FULL_DEBUG)
+ dfltcc_state->level_mask = DFLTCC_LEVEL_MASK_DEBUG;
+ else
+ dfltcc_state->level_mask = DFLTCC_LEVEL_MASK;
dfltcc_state->block_size = DFLTCC_BLOCK_SIZE;
dfltcc_state->block_threshold = DFLTCC_FIRST_FHT_BLOCK_SIZE;
dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
diff --git a/lib/zlib_dfltcc/dfltcc.h b/lib/zlib_dfltcc/dfltcc.h
index 4782c92bb2ff..be70c807b62f 100644
--- a/lib/zlib_dfltcc/dfltcc.h
+++ b/lib/zlib_dfltcc/dfltcc.h
@@ -8,6 +8,7 @@
* Tuning parameters.
*/
#define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */
+#define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */
#define DFLTCC_BLOCK_SIZE 1048576
#define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096
#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096
diff --git a/lib/zlib_dfltcc/dfltcc_deflate.c b/lib/zlib_dfltcc/dfltcc_deflate.c
index 9f0f1c90c4e0..00c185101c6d 100644
--- a/lib/zlib_dfltcc/dfltcc_deflate.c
+++ b/lib/zlib_dfltcc/dfltcc_deflate.c
@@ -3,6 +3,7 @@
#include "../zlib_deflate/defutil.h"
#include "dfltcc_util.h"
#include "dfltcc.h"
+#include <asm/setup.h>
#include <linux/zutil.h>
/*
@@ -15,6 +16,11 @@ int dfltcc_can_deflate(
deflate_state *state = (deflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
+ /* Check for kernel dfltcc command line parameter */
+ if (zlib_dfltcc_support == ZLIB_DFLTCC_DISABLED ||
+ zlib_dfltcc_support == ZLIB_DFLTCC_INFLATE_ONLY)
+ return 0;
+
/* Unsupported compression settings */
if (!dfltcc_are_params_ok(state->level, state->w_bits, state->strategy,
dfltcc_state->level_mask))
diff --git a/lib/zlib_dfltcc/dfltcc_inflate.c b/lib/zlib_dfltcc/dfltcc_inflate.c
index 12a93a06bd61..aa9ef23474df 100644
--- a/lib/zlib_dfltcc/dfltcc_inflate.c
+++ b/lib/zlib_dfltcc/dfltcc_inflate.c
@@ -3,6 +3,7 @@
#include "../zlib_inflate/inflate.h"
#include "dfltcc_util.h"
#include "dfltcc.h"
+#include <asm/setup.h>
#include <linux/zutil.h>
/*
@@ -15,6 +16,11 @@ int dfltcc_can_inflate(
struct inflate_state *state = (struct inflate_state *)strm->state;
struct dfltcc_state *dfltcc_state = GET_DFLTCC_STATE(state);
+ /* Check for kernel dfltcc command line parameter */
+ if (zlib_dfltcc_support == ZLIB_DFLTCC_DISABLED ||
+ zlib_dfltcc_support == ZLIB_DFLTCC_DEFLATE_ONLY)
+ return 0;
+
/* Unsupported compression settings */
if (state->wbits != HB_BITS)
return 0;
diff --git a/lib/zlib_dfltcc/dfltcc_util.h b/lib/zlib_dfltcc/dfltcc_util.h
index 82cd1950c416..7c0d3bdc50a9 100644
--- a/lib/zlib_dfltcc/dfltcc_util.h
+++ b/lib/zlib_dfltcc/dfltcc_util.h
@@ -4,6 +4,7 @@
#include <linux/zutil.h>
#include <asm/facility.h>
+#include <asm/setup.h>
/*
* C wrapper for the DEFLATE CONVERSION CALL instruction.
@@ -102,7 +103,8 @@ static inline int dfltcc_are_params_ok(
static inline int is_dfltcc_enabled(void)
{
- return test_facility(DFLTCC_FACILITY);
+ return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
+ test_facility(DFLTCC_FACILITY));
}
char *oesc_msg(char *buf, int oesc);