The patch titled
Subject: s390/boot: add dfltcc= kernel command line parameter
has been added to the -mm tree. Its filename is
s390-boot-add-dfltcc=-kernel-command-line-parameter.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/s390-boot-add-dfltcc%3D-kernel-command-line-parameter.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/s390-boot-add-dfltcc%3D-kernel-command-line-parameter.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
Subject: 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/20191209152948.37080-5-zaslonko@xxxxxxxxxxxxx
Signed-off-by: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: Eduard Shishkin <edward6@xxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 12 ++++++++++++
arch/s390/boot/ipl_parm.c | 14 ++++++++++++++
arch/s390/include/asm/setup.h | 7 +++++++
arch/s390/kernel/setup.c | 1 +
lib/zlib_dfltcc/dfltcc.c | 5 ++++-
lib/zlib_dfltcc/dfltcc.h | 1 +
lib/zlib_dfltcc/dfltcc_deflate.c | 6 ++++++
lib/zlib_dfltcc/dfltcc_inflate.c | 6 ++++++
lib/zlib_dfltcc/dfltcc_util.h | 5 +++++
9 files changed, 56 insertions(+), 1 deletion(-)
--- a/arch/s390/boot/ipl_parm.c~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/arch/s390/boot/ipl_parm.c
@@ -14,6 +14,7 @@
char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
struct ipl_parameter_block __bootdata_preserved(ipl_block);
int __bootdata_preserved(ipl_block_valid);
+unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL;
unsigned long __bootdata(vmalloc_size) = VMALLOC_DEFAULT_SIZE;
unsigned long __bootdata(memory_end);
@@ -229,6 +230,19 @@ void parse_boot_command_line(void)
if (!strcmp(param, "vmalloc") && val)
vmalloc_size = round_up(memparse(val, NULL), PAGE_SIZE);
+ if (!strcmp(param, "dfltcc")) {
+ if (!strcmp(val, "off"))
+ zlib_dfltcc_support = ZLIB_DFLTCC_DISABLED;
+ else if (!strcmp(val, "on"))
+ zlib_dfltcc_support = ZLIB_DFLTCC_FULL;
+ else if (!strcmp(val, "def_only"))
+ zlib_dfltcc_support = ZLIB_DFLTCC_DEFLATE_ONLY;
+ else if (!strcmp(val, "inf_only"))
+ zlib_dfltcc_support = ZLIB_DFLTCC_INFLATE_ONLY;
+ else if (!strcmp(val, "always"))
+ zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
+ }
+
if (!strcmp(param, "noexec")) {
rc = kstrtobool(val, &enabled);
if (!rc && !enabled)
--- a/arch/s390/include/asm/setup.h~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/arch/s390/include/asm/setup.h
@@ -80,6 +80,13 @@ 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;
--- a/arch/s390/kernel/setup.c~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/arch/s390/kernel/setup.c
@@ -111,6 +111,7 @@ unsigned long __bootdata_preserved(__ete
unsigned long __bootdata_preserved(__sdma);
unsigned long __bootdata_preserved(__edma);
unsigned long __bootdata_preserved(__kaslr_offset);
+unsigned int __bootdata_preserved(zlib_dfltcc_support);
unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);
--- a/Documentation/admin-guide/kernel-parameters.txt~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -834,6 +834,18 @@
dump out devices still on the deferred probe list after
retrying.
+ dfltcc= [HW,S390]
+ 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)
+
dhash_entries= [KNL]
Set number of hash buckets for dentry cache.
--- a/lib/zlib_dfltcc/dfltcc.c~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/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;
--- a/lib/zlib_dfltcc/dfltcc_deflate.c~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/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))
--- a/lib/zlib_dfltcc/dfltcc.h~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/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
--- a/lib/zlib_dfltcc/dfltcc_inflate.c~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/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;
--- a/lib/zlib_dfltcc/dfltcc_util.h~s390-boot-add-dfltcc=-kernel-command-line-parameter
+++ a/lib/zlib_dfltcc/dfltcc_util.h
@@ -3,6 +3,7 @@
#define DFLTCC_UTIL_H
#include <linux/zutil.h>
+#include <asm/setup.h>
/*
* C wrapper for the DEFLATE CONVERSION CALL instruction.
@@ -104,6 +105,10 @@ static inline int is_dfltcc_enabled(void
uint64_t facilities[(DFLTCC_FACILITY / 64) + 1];
register char r0 __asm__("r0");
+ /* Check for kernel dfltcc command line parameter */
+ if (zlib_dfltcc_support == ZLIB_DFLTCC_DISABLED)
+ return 0;
+
memset(facilities, 0, sizeof(facilities));
r0 = sizeof(facilities) / sizeof(facilities[0]) - 1;
__asm__ volatile("stfle %[facilities]\n"
_
Patches currently in -mm which might be from zaslonko@xxxxxxxxxxxxx are
lib-zlib-add-s390-hardware-support-for-kernel-zlib_deflate.patch
s390-boot-rename-heap_size-due-to-name-collision.patch
lib-zlib-add-s390-hardware-support-for-kernel-zlib_inflate.patch
s390-boot-add-dfltcc=-kernel-command-line-parameter.patch
lib-zlib-add-zlib_deflate_dfltcc_enabled-function.patch
btrfs-use-larger-zlib-buffer-for-s390-hardware-compression.patch
