linux-stable.git/arch/powerpc/kernel/align.c, branch v4.8

powerpc: Move cpu_has_feature() to a separate file

2016-08-01T01:15:03+00:00

We plan to use jump label for cpu_has_feature(). In order to implement
this we need to include the linux/jump_label.h in asm/cputable.h.

Unfortunately if we do that it leads to an include loop. The root of the
problem seems to be that reg.h needs cputable.h (for CPU_FTRs), and then
cputable.h via jump_label.h eventually pulls in hw_irq.h which needs
reg.h (for MSR_EE).

So move cpu_has_feature() to a separate file on its own.

Signed-off-by: Kevin Hao 
Signed-off-by: Aneesh Kumar K.V 
[mpe: Rename to cpu_has_feature.h and flesh out change log]
Signed-off-by: Michael Ellerman

powerpc: Send SIGBUS on unaligned copy and paste

2016-07-05T13:49:51+00:00

Calling ISA 3.0 instructions copy, copy_first, paste and paste_last
generates an alignment fault when copying or pasting unaligned
data (128 byte). We catch this and send SIGBUS to the userspace
process that caused it.

We do not emulate these because paste may contain additional metadata
when pasting to a co-processor and paste_last is the synchronisation
point for preceding copy/paste sequences.

Thanks to Michael Neuling  for his help.

Signed-off-by: Chris Smart 
Signed-off-by: Michael Ellerman

powerpc/align: Use #ifdef __BIG_ENDIAN__ #else for REG_BYTE

2016-06-16T12:40:19+00:00

Sparse complains that it doesn't know what REG_BYTE is:

  arch/powerpc/kernel/align.c:313:29: error: undefined identifier 'REG_BYTE'

REG_BYTE is defined differently based on whether we're compiling for
LE, BE32 or BE64. Sparse apparently doesn't provide __BIG_ENDIAN__ or
__LITTLE_ENDIAN__, which means we get no definition.

Rather than check for __BIG_ENDIAN__ and then separately for
__LITTLE_ENDIAN__, just switch the #ifdef to check for __BIG_ENDIAN__
and then #else we define the little endian version. Technically that's
dicey because PDP_ENDIAN is also a possibility, but we already do it in
a lot of places so one more hardly matters.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()

2015-12-01T02:52:25+00:00

The enable_kernel_*() functions leave the relevant MSR bits enabled
until we exit the kernel sometime later. Create disable versions
that wrap the kernel use of FP, Altivec VSX or SPE.

While we don't want to disable it normally for performance reasons
(MSR writes are slow), it will be used for a debug boot option that
does this and catches bad uses in other areas of the kernel.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc: Remove double braces in alignment code.

2014-11-09T22:59:32+00:00

Looks like I introduced this when adding LE support.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

KVM: PPC: BOOK3S: Remove open coded make_dsisr in alignment handler

2014-05-30T12:26:25+00:00

Use make_dsisr instead of open coding it. This also have
the added benefit of handling alignment interrupt on additional
instructions.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Alexander Graf

powerpc: Add lq/stq emulation

2014-04-09T02:53:28+00:00

Recent CPUs support quad word load and store instructions. Add
support to the alignment handler for them.

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

powerpc: Enable Little Endian Alignment Handler for Float Pair Instructions

2013-10-30T05:01:23+00:00

This patch enables alignment handling for the load/store floating point
pair instructions (lfdp, lfdpx, stfdp, stfdpx).  The handler routine
is properly coded and only needs to be enabled.

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

powerpc: Fix Handler of Unaligned Load/Store Strings

2013-10-30T05:01:17+00:00

The alignment handler is incorrect for unaligned string instructions
in little endian mode.  These instructions access data as arrays of
bytes and thus are endian neutral.  However, the routine also handles
the load/store multiple instructions, which are NOT endian neutral.

This patch toggles the byte swapping flag for the string instructions
in little endian builds.  This effectively disables the byte swapping
logic.

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

Merge branch 'for-kvm' into next

2013-10-11T07:23:53+00:00

Topic branch for commits that the KVM tree might want to pull
in separately.

Hand merged a few files due to conflicts with the LE stuff

Signed-off-by: Benjamin Herrenschmidt