Re: pgprot_writecombine() and PATs on x86

From: Roland Dreier
Date: Wed Apr 25 2007 - 14:35:38 EST

> Roland is the mlx4 sane enough to put the memory that needs
> write-combining a prefetchable bar. So several cards can be combined
> together?

Yes, it is in a prefetchable BAR. It's the second half of the second
BAR in:

0d:00.0 InfiniBand: Mellanox Technologies Unknown device 634a (rev a0)
Subsystem: Mellanox Technologies Unknown device 634a
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fc400000 (64-bit, non-prefetchable) [size=1M]
Memory at d8000000 (64-bit, prefetchable) [size=8M]
Memory at fc3fe000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>

but I'm not sure what you mean about combining several cards?

- R.
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