linux.git/arch/powerpc/lib, branch v3.14

powerpc: Add vr save/restore functions

2014-01-15T02:46:43+00:00

GCC 4.8 now generates out-of-line vr save/restore functions when
optimizing for size.  They are needed for the raid6 altivec support.

Signed-off-by: Andreas Schwab 
Signed-off-by: Benjamin Herrenschmidt

Merge branch 'merge' into next

2013-12-30T04:19:31+00:00

Merge a pile of fixes that went into the "merge" branch (3.13-rc's) such
as Anton Little Endian fixes.

Signed-off-by: Benjamin Herrenschmidt

powerpc: Make 64-bit non-VMX __copy_tofrom_user bi-endian

2013-12-30T03:02:30+00:00

The powerpc 64-bit __copy_tofrom_user() function uses shifts to handle
unaligned invocations.  However, these shifts were designed for
big-endian systems: On little-endian systems, they must shift in the
opposite direction.

This commit relies on the C preprocessor to insert the correct shifts
into the assembly code.

[ This is a rare but nasty LE issue. Most of the time we use the POWER7
optimised __copy_tofrom_user_power7 loop, but when it hits an exception
we fall back to the base __copy_tofrom_user loop. - Anton ]

Signed-off-by: Paul E. McKenney 
Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Move the patch_exception to a common place

2013-12-02T03:06:54+00:00

So that it can be used by other codes. No function change.

Signed-off-by: Kevin Hao 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Add VMX optimised xor for RAID5

2013-10-30T05:02:28+00:00

Add a VMX optimised xor, used primarily for RAID5. On a POWER7 blade
this is a decent win:

   32regs    : 17932.800 MB/sec
   altivec   : 19724.800 MB/sec

The bigger gain is when the same test is run in SMT4 mode, as it
would if there was a lot of work going on:

   8regs     :  8377.600 MB/sec
   altivec   : 15801.600 MB/sec

I tested this against an array created without the patch, and also
verified it worked as expected on a little endian kernel.

[ Fix !CONFIG_ALTIVEC build -- BenH ]

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix Unaligned LE Floating Point Loads and Stores

2013-10-30T05:01:36+00:00

This patch addresses unaligned single precision floating point loads
and stores in the single-step code.  The old implementation
improperly treated an 8 byte structure as an array of two 4 byte
words, which is a classic little endian bug.

Signed-off-by: Tom Musta 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix Unaligned Loads and Stores

2013-10-30T05:01:30+00:00

This patch modifies the unaligned access routines of the sstep.c
module so that it properly reverses the bytes of storage operands
in the little endian kernel kernel.   This is implemented by
breaking an unaligned little endian access into a combination of
single byte accesses plus an overal byte reversal operation.

Signed-off-by: Tom Musta 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use generic memcpy code in little endian

2013-10-11T05:48:40+00:00

We need to fix some endian issues in our memcpy code. For now
just enable the generic memcpy routine for little endian builds.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use generic checksum code in little endian

2013-10-11T05:48:39+00:00

We need to fix some endian issues in our checksum code. For now
just enable the generic checksum routines for little endian builds.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix endian issues in VMX copy loops

2013-10-11T05:48:25+00:00

Fix the permute loops for little endian.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt