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c65e6815db
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>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
// SPDX-License-Identifier: Zlib
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/* dfltcc.c - SystemZ DEFLATE CONVERSION CALL support. */
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#include <linux/zutil.h>
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#include "dfltcc_util.h"
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#include "dfltcc.h"
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char *oesc_msg(
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char *buf,
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int oesc
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)
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{
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if (oesc == 0x00)
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return NULL; /* Successful completion */
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else {
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#ifdef STATIC
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return NULL; /* Ignore for pre-boot decompressor */
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#else
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sprintf(buf, "Operation-Ending-Supplemental Code is 0x%.2X", oesc);
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return buf;
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#endif
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}
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}
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void dfltcc_reset(
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z_streamp strm,
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uInt size
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)
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{
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struct dfltcc_state *dfltcc_state =
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(struct dfltcc_state *)((char *)strm->state + size);
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struct dfltcc_qaf_param *param =
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(struct dfltcc_qaf_param *)&dfltcc_state->param;
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/* Initialize available functions */
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if (is_dfltcc_enabled()) {
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dfltcc(DFLTCC_QAF, param, NULL, NULL, NULL, NULL, NULL);
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memmove(&dfltcc_state->af, param, sizeof(dfltcc_state->af));
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} else
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memset(&dfltcc_state->af, 0, sizeof(dfltcc_state->af));
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/* Initialize parameter block */
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memset(&dfltcc_state->param, 0, sizeof(dfltcc_state->param));
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dfltcc_state->param.nt = 1;
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/* Initialize tuning parameters */
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if (zlib_dfltcc_support == ZLIB_DFLTCC_FULL_DEBUG)
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dfltcc_state->level_mask = DFLTCC_LEVEL_MASK_DEBUG;
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else
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dfltcc_state->level_mask = DFLTCC_LEVEL_MASK;
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dfltcc_state->block_size = DFLTCC_BLOCK_SIZE;
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dfltcc_state->block_threshold = DFLTCC_FIRST_FHT_BLOCK_SIZE;
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dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
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dfltcc_state->param.ribm = DFLTCC_RIBM;
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}
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