Arjan> do you really NEED the vaddr? (most of the time linux
Arjan> drivers don't need it, while other OSes do) If you really
Arjan> need it you should grab it at dma_map time ... (and
Arjan> realize that it's not kernel addressable per se ;)
Yes, they need some kind of vaddr.
It's kind of a layering problem. The IB stack assumes that IB devices
have a DMA engine that deals with bus addresses. But the ipath driver
has to simulate this by using a memcpy on the CPU to move data to the
PCI device.
I really don't know what the right solution is. Maybe having some way
to override the dma mapping operations so that the ipath driver can
keep the info it needs?
- R.
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