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powerpc/pseries: Add support for dynamic dma windows

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If firmware allows us to map all of a partition's memory for DMA on a
particular bridge, create a 1:1 mapping of that memory. Add hooks for
dealing with hotplug events. Dynamic DMA windows can use larger than the
default page size, and we use the largest one possible.

Signed-off-by: Nishanth Aravamudan <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
This commit is contained in:
Nishanth Aravamudan 2011-02-10 09:10:47 +00:00 • committed by Benjamin Herrenschmidt
commit 4e8b0cf46b
2 changed files with 591 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
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@ -626,6 +626,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
disable= [IPV6]
See Documentation/networking/ipv6.txt.
disable_ddw [PPC/PSERIES]
Disable Dynamic DMA Window support. Use this if
to workaround buggy firmware.
disable_ipv6= [IPV6]
See Documentation/networking/ipv6.txt.