Re: PPC64 & DMA zone

On Sun, 2012-09-02 at 02:54 +0000, Tabi Timur-B04825 wrote:

On Fri, Aug 17, 2012 at 3:40 PM, Benjamin Herrenschmidt
[off-list ref] wrote:

quoted

On Fri, 2012-08-17 at 23:04 +0300, Aaro Koskinen wrote:

quoted

Hi,

Is there a way to reduce/limit DMA zone with PPC64 kernel (3.6-rcX)
on G5 Mac? I have tried to search Kconfig or command line options,
but can't find anything.

No.

What about Shaohui patches for ZONE_DMA?  That's meant to solve
exactly this problem?  Granted, it sets the DMA zone to 31 bits, but
it's simple to hack that to 30 bits.

Unnecessary for this specific problem. The right fix to the iommu code
has already been done.

Cheers,
Ben.