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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2016-12-20 10:02:02 -0500
committerKonrad Rzeszutek Wilk <konrad@kernel.org>2017-01-06 13:00:01 -0500
commit7453c549f5f6485c0d79cad7844870dcc7d1b34d (patch)
treed6303358532275cd114b471810d6fc2333780367 /arch/arm64
parentfff5d99225107f5f13fe4a9805adc2a1c4b5fb00 (diff)
downloadlinux-7453c549f5f6485c0d79cad7844870dcc7d1b34d.tar.gz
swiotlb: Export swiotlb_max_segment to users
So they can figure out what is the optimal number of pages that can be contingously stitched together without fear of bounce buffer. We also expose an mechanism for sub-users of SWIOTLB API, such as Xen-SWIOTLB to set the max segment value. And lastly if swiotlb=force is set (which mandates we bounce buffer everything) we set max_segment so at least we can bounce buffer one 4K page instead of a giant 512KB one for which we may not have space. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reported-and-Tested-by: Juergen Gross <jgross@suse.com>
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