15 Jun
2011
15 Jun
'11
11:20 a.m.
On Wednesday 15 June 2011, Michal Nazarewicz wrote:
On Tue, 14 Jun 2011 22:42:24 +0200, Arnd Bergmann arnd@arndb.de wrote:
- We still need to solve the same problem in case of IOMMU mappings at some point, even if today's hardware doesn't have this combination. It would be good to use the same solution for both.
I don't think I follow. What does IOMMU has to do with CMA?
The point is that on the higher level device drivers, we want to hide the presence of CMA and/or IOMMU behind the dma mapping API, but the device drivers do need to know about the bank properties.
If we want to solve the problem of allocating per-bank memory inside of CMA, we also need to solve it inside of the IOMMU code, using the same device driver interface.
Arnd