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authorMatt Brown <matthew.brown.dev@gmail.com>2017-08-04 06:42:32 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-03-20 08:47:25 +0300
commit751ba79cc552c146595cd439b21c4ff8998c3b69 (patch)
treefc7aa71ed1ca788ab3a9c553021f7c876ccd4115 /lib/raid6/algos.c
parent7004263bd4f4c79da9ca2a1d04d38d4d6ed609ab (diff)
downloadlinux-751ba79cc552c146595cd439b21c4ff8998c3b69.tar.xz
lib/raid6/altivec: Add vpermxor implementation for raid6 Q syndrome
This patch uses the vpermxor instruction to optimise the raid6 Q syndrome. This instruction was made available with POWER8, ISA version 2.07. It allows for both vperm and vxor instructions to be done in a single instruction. This has been tested for correctness on a ppc64le vm with a basic RAID6 setup containing 5 drives. The performance benchmarks are from the raid6test in the /lib/raid6/test directory. These results are from an IBM Firestone machine with ppc64le architecture. The benchmark results show a 35% speed increase over the best existing algorithm for powerpc (altivec). The raid6test has also been run on a big-endian ppc64 vm to ensure it also works for big-endian architectures. Performance benchmarks: raid6: altivecx4 gen() 18773 MB/s raid6: altivecx8 gen() 19438 MB/s raid6: vpermxor4 gen() 25112 MB/s raid6: vpermxor8 gen() 26279 MB/s Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com> Reviewed-by: Daniel Axtens <dja@axtens.net> [mpe: Add VPERMXOR macro so we can build with old binutils] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'lib/raid6/algos.c')
-rw-r--r--lib/raid6/algos.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index 476994723258..b2e681018145 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -74,6 +74,10 @@ const struct raid6_calls * const raid6_algos[] = {
&raid6_altivec2,
&raid6_altivec4,
&raid6_altivec8,
+ &raid6_vpermxor1,
+ &raid6_vpermxor2,
+ &raid6_vpermxor4,
+ &raid6_vpermxor8,
#endif
#if defined(CONFIG_TILEGX)
&raid6_tilegx8,