From c65e6815db1c2e28d5554bd99d3a6e522ab599d1 Mon Sep 17 00:00:00 2001 From: Mikhail Zaslonko Date: Thu, 30 Jan 2020 22:16:27 -0800 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/20200103223334.20669-5-zaslonko@linux.ibm.com Signed-off-by: Mikhail Zaslonko Cc: Chris Mason Cc: Christian Borntraeger Cc: David Sterba Cc: Eduard Shishkin Cc: Heiko Carstens Cc: Ilya Leoshkevich Cc: Josef Bacik Cc: Richard Purdie Cc: Vasily Gorbik Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/zlib_dfltcc/dfltcc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'lib/zlib_dfltcc/dfltcc.c') 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; -- cgit v1.2.3