linux.git/arch/powerpc/kernel, branch v2.6.29

powerpc/mm: Fix Respect _PAGE_COHERENT on classic ppc32 SW TLB load machines

2009-03-23T13:38:26+00:00

Grant picked up the wrong version of "Respect _PAGE_COHERENT on classic
ppc32 SW" (commit a4bd6a93c3f14691c8a29e53eb04dc734b27f0db)

It was missing the code to actually deal with the fixup of
_PAGE_COHERENT based on the CPU feature.

Signed-off-by: Kumar Gala

powerpc/mm: Respect _PAGE_COHERENT on classic ppc32 SW

2009-03-17T15:17:50+00:00

Since we now set _PAGE_COHERENT in the Linux PTE we shouldn't be clearing
it out before we setup the SW TLB.  Today all the SW TLB machines
(603/e300) that we support are non-SMP, however there are some errata on
some devices that cause us to set _PAGE_COHERENT via CPU_FTR_NEED_COHERENT.

Signed-off-by: Kumar Gala 
Signed-off-by: Grant Likely

powerpc: Fix load/store float double alignment handler

2009-02-26T03:02:53+00:00

When we introduced VSX, we changed the way FPRs are stored in the
thread_struct.  Unfortunately we missed the load/store float double
alignment handler code when updating how we access FPRs in the
thread_struct.

Below fixes this and merges the little/big endian case.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc/vsx: Fix VSX alignment handler for regs 32-63

2009-02-13T05:37:45+00:00

Fix the VSX alignment handler for VSX registers > 32.  32-63 are stored
in the VMX part of the thread_struct not the FPR part.

Signed-off-by: Michael Neuling 
CC: stable@kernel.org (2.6.27 & .28 please)
Signed-off-by: Benjamin Herrenschmidt

powerpc/pci: mmap anonymous memory when legacy_mem doesn't exist

2009-02-10T03:39:08+00:00

The new legacy_mem file in sysfs is causing problems with X on machines
that don't support legacy memory access. The way I initially implemented
it, we would fail with -ENXIO when trying to mmap it, thus exposing to
X that we do support the API but there is no legacy memory.

Unfortunately, X poor error handling is causing it to fail to start when
it gets this error.

This implements a workaround hack that instead maps anonymous memory
instead (using shmem if VM_SHARED is set, just like /dev/zero does).

Signed-off-by: Benjamin Herrenschmidt

powerpc/ftrace: Fix math to calculate offset in TOC

2009-02-10T03:39:08+00:00

Impact: fix dynamic ftrace with large modules in PPC64

The math to calculate the offset into the TOC that is taken from reading
the trampoline is incorrect. The bottom half of the offset is a signed
extended short. The current code was using an OR to create the offset
when it should have been using an addition.

Signed-off-by: Steven Rostedt 
Acked-by: Geoff Levand 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix oops on some machines due to incorrect pr_debug()

2009-02-02T06:08:25+00:00

Recently, a patch left DEBUG enabled in the powerpc common PCI code,
resulting in an old bug in a pr_debug() statement to show up and cause
a NULL dereference on some machines.

This fixes the pr_debug() statement and reverts to DEBUG not being
force-enabled in that file.

Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Correct VIO bus accounting problem in CMO env.

2009-01-28T06:15:52+00:00

In the VIO bus code the wrappers for dma alloc_coherent and free_coherent
calls are rounding to IOMMU_PAGE_SIZE.  Taking a look at the underlying
calls, the actual mapping is promoted to PAGE_SIZE.  Changing the
rounding in these two functions fixes under-reporting the entitlement
used by the system.  Without this change, the system could run out of
entitlement before it believes it has and incur mapping failures at the
firmware level.

Also in the VIO bus code, the wrapper for dma map_sg is not exiting in
an error path where it should.  Rather than fall through to code for the
success case, this patch adds the return that is needed in the error path.

Signed-off-by: Robert Jennings 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Get the number of SLBs from "slb-size" property

2009-01-16T05:15:16+00:00

The PAPR says that the property for specifying the number of SLBs should
be called "slb-size".  We currently only look for "ibm,slb-size" because
this is what firmware actually presents.

This patch makes us look for the "slb-size" property as well and in
preference to the "ibm,slb-size".  This should future proof us if
firmware changes to match PAPR.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc/e500mc: Doorbells need to be taken w/exceptions disabled

2009-01-13T23:46:24+00:00

We use Doorbell interrupts for IPIs and thus we need to make sure we aren't
interrupted in the process of processing the IPI.

Signed-off-by: Kumar Gala 
Acked-by: Dave Liu