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14b6f00f8a
linux/arch/powerpc
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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
..
boot powerpc/dts/virtex440: Add ethernet phy to virtex440-ml507 board 2013-01-10 15:09:05 +11:00
configs powerpc/fsl: Remove CONFIG_IRQ_ALL_CPUS from mpc85xx/mpc86xx defconfig 2013-01-29 11:35:05 +11:00
crypto powerpc: Add a powerpc implementation of SHA-1 2013-01-10 14:43:45 +11:00
include powerpc: Change hardware breakpoint to allow longer ranges 2013-01-29 11:35:08 +11:00
kernel powerpc: fix ics_rtas_init and start_secondary section mismatch 2013-02-08 14:05:48 +11:00
kvm Merge branch 'merge' into next 2013-01-29 11:33:37 +11:00
lib uprobes/powerpc: Add dependency on single step emulation 2013-01-29 11:35:06 +11:00
math-emu
mm powerpc/mm: Eliminate unneeded for_each_memblock 2013-01-29 11:34:25 +11:00
net
oprofile Merge branch 'merge' into next 2013-01-29 11:33:37 +11:00
perf perf/Power: PERF_EVENT_IOC_ENABLE does not reenable event 2013-01-29 11:35:07 +11:00
platforms pseries/iommu: Remove DDW on kexec 2013-02-08 14:05:49 +11:00
sysdev powerpc: fix ics_rtas_init and start_secondary section mismatch 2013-02-08 14:05:48 +11:00
xmon powerpc: Rename set_break to avoid naming conflict 2013-01-16 05:25:47 +11:00
Kconfig uprobes/powerpc: Add dependency on single step emulation 2013-01-29 11:35:06 +11:00
Kconfig.debug
Makefile powerpc: Avoid load of static chain register when calling nested functions through a pointer on 64bit 2013-01-10 17:01:27 +11:00
relocs_check.pl