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linux/arch/powerpc/platforms
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Nishanth Aravamudan 14b6f00f8a pseries/iommu: Remove DDW on kexec 
pseries/iommu: remove DDW on kexec

We currently insert a property in the device-tree when we successfully
configure DDW for a given slot. This was meant to be an optimization to
speed up kexec/kdump, so that we don't need to make the RTAS calls again
to re-configured DDW in the new kernel.

However, we end up tripping a plpar_tce_stuff failure on kexec/kdump
because we unconditionally parse the ibm,dma-window property for the
node at bus/dev setup time. This property contains the 32-bit DMA window
LIOBN, which is distinct from the DDW window's. We pass that LIOBN (via
iommu_table_init -> iommu_table_clear -> tce_free ->
tce_freemulti_pSeriesLP) to plpar_tce_stuff, which fails because that
32-bit window is no longer present after
25ebc45b93 ("powerpc/pseries/iommu: remove
default window before attempting DDW manipulation").

I believe the simplest, easiest-to-maintain fix is to just change our
initcall to, rather than detecting and updating the new kernel's DDW
knowledge, just remove all DDW configurations. When the drivers
re-initialize, we will set everything back up as it was before.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-02-08 14:05:49 +11:00
..
8xx
40x powerpc: Add missing NULL terminator to avoid boot panic on PPC40x 2013-01-03 16:45:52 +11:00
44x powerpc/44x: Support OCM(On Chip Memory) for APM821xx SoC and Bluestone board 2013-01-10 15:08:37 +11:00
52xx POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
82xx powerpc/82xx: Use for_each_compatible_node() macro 2013-01-10 17:00:51 +11:00
83xx POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
85xx powerpc: Add support for CTS-1000 GPIO controlled system poweroff 2013-01-29 11:35:05 +11:00
86xx POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
512x powerpc/512x: don't compile any platform DIU code if the DIU is not enabled 2012-12-03 22:13:34 +01:00
amigaone
cell powerpc: Convert print_symbol to %pSR 2013-01-10 17:01:16 +11:00
chrp POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
embedded6xx
maple POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pasemi powerpc/pasemi: Fix crash on reboot 2013-01-29 10:18:14 +11:00
powermac POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
powernv POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
prep
ps3 POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pseries pseries/iommu: Remove DDW on kexec 2013-02-08 14:05:49 +11:00
wsp powerpc: Build kernel with -mcmodel=medium 2013-01-10 17:00:31 +11:00
fsl_uli1575.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
Kconfig
Kconfig.cputype powerpc: Update Kconfig + Makefile to prepare for server doorbells 2013-01-10 15:09:08 +11:00
Makefile