Use the vector polynomial multiply-sum instructions in POWER8 to
speed up crc32c.

This is just over 41x faster than the slice-by-8 method that it
replaces. Measurements on a 4.1 GHz POWER8 show it sustaining
52 GiB/sec.

A simple btrfs write performance test:

    dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096
    sync

is over 3.7x faster.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The current cryptodev-2.6 tree commits:

d9850fc5 ("crypto: powerpc/sha1 - kernel config")
50ba29aa ("crypto: powerpc/sha1 - glue")

failed to properly place files under arch/powerpc/crypto, which
leads to build errors:

make[1]: *** No rule to make target 'arch/powerpc/crypto/sha1-spe-asm.o', needed by 'arch/powerpc/crypto/sha1-ppc-spe.o'.  Stop.
make[1]: *** No rule to make target 'arch/powerpc/crypto/sha1_spe_glue.o', needed by 'arch/powerpc/crypto/sha1-ppc-spe.o'.  Stop.
Makefile:947: recipe for target 'arch/powerpc/crypto' failed

Move the two sha1 spe files under crypto/, and whilst there, rename
other powerpc crypto files with underscores to use dashes for
consistency.

Cc: Markus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NKim Phillips <kim.phillips@freescale.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Integrate the module into the kernel config tree.
Signed-off-by: NMarkus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Integrate the module into the kernel config tree.
Signed-off-by: NMarkus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Integrate the module into the kernel configuration
Signed-off-by: NMarkus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Integrate the module into the kernel config tree.
Signed-off-by: NMarkus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch adds a crypto driver which provides a powerpc accelerated
implementation of SHA-1, accelerated in that it is written in asm.

Original patch by Paul, minor fixups for upstream by moi.

Lightly tested on 64-bit with the test program here:

 http://michael.ellerman.id.au/files/junkcode/sha1test.c

Seems to work, and is "not slower" than the generic version.

Needs testing on 32-bit.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>