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23 commits

Author SHA1 Message Date
Linus Torvalds
4d7696f1b0 md update for v3.12
Headline item is multithreading for RAID5 so that more
 IO/sec can be supported on fast (SSD) devices.
 Also TILE-Gx SIMD suppor for RAID6 calculations and an
 assortment of bug fixes.
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Merge tag 'md/3.12' of git://neil.brown.name/md

Pull md update from Neil Brown:
 "Headline item is multithreading for RAID5 so that more IO/sec can be
  supported on fast (SSD) devices.  Also TILE-Gx SIMD suppor for RAID6
  calculations and an assortment of bug fixes"

* tag 'md/3.12' of git://neil.brown.name/md:
  raid5: only wakeup necessary threads
  md/raid5: flush out all pending requests before proceeding with reshape.
  md/raid5: use seqcount to protect access to shape in make_request.
  raid5: sysfs entry to control worker thread number
  raid5: offload stripe handle to workqueue
  raid5: fix stripe release order
  raid5: make release_stripe lockless
  md: avoid deadlock when dirty buffers during md_stop.
  md: Don't test all of mddev->flags at once.
  md: Fix apparent cut-and-paste error in super_90_validate
  raid6/test: replace echo -e with printf
  RAID: add tilegx SIMD implementation of raid6
  md: fix safe_mode buglet.
  md: don't call md_allow_write in get_bitmap_file.
2013-09-10 13:03:41 -07:00
Max Filippov
c28399b594 raid6/test: replace echo -e with printf
-e is a non-standard echo option, echo output is
implementation-dependent when it is used. Replace echo -e with printf as
suggested by POSIX echo manual.

Cc: NeilBrown <neilb@suse.de>
Cc: Jim Kukunas <james.t.kukunas@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2013-08-27 16:06:06 +10:00
Ken Steele
ae77cbc1e7 RAID: add tilegx SIMD implementation of raid6
This change adds TILE-Gx SIMD instructions to the software raid
(md), modeling the Altivec implementation. This is only for Syndrome
generation; there is more that could be done to improve recovery,
as in the recent Intel SSE3 recovery implementation.

The code unrolls 8 times; this turns out to be the best on tilegx
hardware among the set 1, 2, 4, 8 or 16.  The code reads one
cache-line of data from each disk, stores P and Q then goes to the
next cache-line.

The test code in sys/linux/lib/raid6/test reports 2008 MB/s data
read rate for syndrome generation using 18 disks (16 data and 2
parity). It was 1512 MB/s before this SIMD optimizations. This is
running on 1 core with all the data in cache.

This is based on the paper The Mathematics of RAID-6.
(http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf).

Signed-off-by: Ken Steele <ken@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2013-08-27 16:05:50 +10:00
Ard Biesheuvel
7d11965ddb lib/raid6: add ARM-NEON accelerated syndrome calculation
Rebased/reworked a patch contributed by Rob Herring that uses
NEON intrinsics to perform the RAID-6 syndrome calculations.
It uses the existing unroll.awk code to generate several
unrolled versions of which the best performing one is selected
at boot time.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Cc: hpa@linux.intel.com
2013-07-08 22:09:18 +01:00
Yuanhan Liu
4f8c55c5ad lib/raid6: build proper files on corresponding arch
sse and avx2 stuff only exist on x86 arch, and we don't need to build
altivec on x86. And we can do that at lib/raid6/Makefile.

Proposed-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-12-13 19:51:04 +11:00
Yuanhan Liu
2c935842bd lib/raid6: Add AVX2 optimized gen_syndrome functions
Add AVX2 optimized gen_syndrom functions, which is simply based on
sse2.c written by hpa.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-12-13 19:51:03 +11:00
Jim Kukunas
7056741fd9 lib/raid6: Add AVX2 optimized recovery functions
Optimize RAID6 recovery functions to take advantage of
the 256-bit YMM integer instructions introduced in AVX2.

The patch was tested and benchmarked before submission.
However hardware is not yet released so benchmark numbers
cannot be reported.

Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-12-13 16:42:01 +11:00
Jim Kukunas
2aa4ee2a88 lib/raid6: fix sparse warnings in recovery functions
Make the recovery functions static to fix the following sparse warnings:

lib/raid6/recov.c:25:6: warning: symbol 'raid6_2data_recov_intx1' was
not declared. Should it be static?
lib/raid6/recov.c:69:6: warning: symbol 'raid6_datap_recov_intx1' was
not declared. Should it be static?
lib/raid6/recov_ssse3.c:22:6: warning: symbol 'raid6_2data_recov_ssse3'
was not declared. Should it be static?
lib/raid6/recov_ssse3.c:197:6: warning: symbol 'raid6_datap_recov_ssse3'
was not declared. Should it be static?

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-05-28 14:10:22 +10:00
Jim Kukunas
96e67703e7 lib/raid6: cleanup gen_syndrome function selection
Reorders functions in raid6_algos as well as the preference check
to reduce the number of functions tested on initialization.

Also, creates symmetry between choosing the gen_syndrome functions
and choosing the recovery functions.

Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-05-22 13:54:24 +10:00
Jim Kukunas
2dbf708448 lib/raid6: update test program for recovery functions
Test each combination of recovery and syndrome generation
functions.

Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-05-22 13:54:23 +10:00
Jim Kukunas
048a8b8c89 lib/raid6: Add SSSE3 optimized recovery functions
Add SSSE3 optimized recovery functions, as well as a system
for selecting the most appropriate recovery functions to use.

Originally-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-05-22 13:54:18 +10:00
Jim Kukunas
f674ef7b43 lib/raid6: fix test program build
<linux/module.h> drags in headers which are not visible to userspace,
thus breaking the build for the test program.

Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2012-05-22 13:54:16 +10:00
David Howells
9ffc93f203 Remove all #inclusions of asm/system.h
Remove all #inclusions of asm/system.h preparatory to splitting and killing
it.  Performed with the following command:

perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *`

Signed-off-by: David Howells <dhowells@redhat.com>
2012-03-28 18:30:03 +01:00
David Howells
ae3a197e3d Disintegrate asm/system.h for PowerPC
Disintegrate asm/system.h for PowerPC.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cc: linuxppc-dev@lists.ozlabs.org
2012-03-28 18:30:02 +01:00
Paul Gortmaker
daaa5f7cbe md: Add in export.h for files using EXPORT_SYMBOL
These files were getting the defines for EXPORT_SYMBOL because
device.h was including module.h.  But we are going to put an
end to that.  So add the proper export.h include now.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:19 -04:00
Paul Gortmaker
056075c764 md: Add module.h to all files using it implicitly
A pending cleanup will mean that module.h won't be implicitly
everywhere anymore.  Make sure the modular drivers in md dir
are actually calling out for <module.h> explicitly in advance.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:18 -04:00
Dan McGee
bd860c53d4 lib/raid6: Fix filename emitted in generated code
The files were renamed in commit cc4589ebf; fix the name in the file
itself.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2011-10-20 11:27:50 +11:00
NeilBrown
7c44ece988 Move .gitignore from drivers/md to lib/raid6
Another missing bit of the raid6 -> /lib move.

Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2010-08-30 17:35:52 +10:00
NeilBrown
a8e026c785 Further tidyup of raid6 naming in lib/raid6
Rename raid6/raid6x86.h to raid6/x86.h
and modify some comments.

Signed-off-by: NeilBrown <neilb@suse.de>
2010-08-12 06:44:54 +10:00
NeilBrown
d5302fe41f Make lib/raid6/test build correctly.
Some bit-rot needs to be cleaned out.

Signed-off-by: NeilBrown <neilb@suse.de>
2010-08-12 06:38:24 +10:00
David Woodhouse
cc4589ebfa Rename raid6 files now they're in a 'raid6' directory.
Linus asks 'why "raid6" twice?'. No reason.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2010-08-11 00:19:05 +01:00
David Woodhouse
2144381da4 Merge branch 'async' of macbook:git/btrfs-unstable
Conflicts:
	drivers/md/Makefile
	lib/raid6/unroll.pl
2010-08-09 10:36:44 +01:00
David Woodhouse
f5e70d0fe3 md: Factor out RAID6 algorithms into lib/
We'll want to use these in btrfs too.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-10-29 14:38:47 +00:00