powerpc/pseries/iommu: remove default window before attempting DDW manipulation

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An upcoming release of firmware will add DDW extensions, in particular
an API to "reset" the DMA window to the original configuration (32-bit,
2GB in size). With that API available, we can safely remove the default
window, increasing the resources available to firmware for creation of
larger windows for the slot in question -- if we encounter an error, we
can use the new API to reset the state of the slot.

Further, this same release of firmware will make it a hard requirement
for OSes to release the existing window before any other windows will be
shown as available, to avoid conflicts in addressing between the two
windows.

In anticipation of these changes, always remove the default window
before we do any DDW manipulations.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Nishanth Aravamudan 2012-05-15 07:04:32 +00:00 • committed by Benjamin Herrenschmidt

parent 65b8c7226e

commit 25ebc45b93

1 changed files with 92 additions and 15 deletions

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arch/powerpc/platforms/pseries/iommu.c

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