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27 March 2024, 02:37:15 UTC
Revision 7453c549f5f6485c0d79cad7844870dcc7d1b34d authored by Konrad Rzeszutek Wilk on 20 December 2016, 15:02:02 UTC, committed by Konrad Rzeszutek Wilk on 06 January 2017, 18:00:01 UTC 
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>
1 parent fff5d99
History
Tip revision: 7453c549f5f6485c0d79cad7844870dcc7d1b34d authored by Konrad Rzeszutek Wilk on 20 December 2016, 15:02:02 UTC
swiotlb: Export swiotlb_max_segment to users
Tip revision: 7453c54
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