[V7, 1/6] powerpc/powernv: don't enable SRIOV when VF BAR has non 64bit-prefetchable BAR

Michael Ellerman mpe at ellerman.id.au
Wed Feb 17 23:41:27 AEDT 2016

On Thu, 2015-22-10 at 01:22:14 UTC, Wei Yang wrote:
> On PHB3, we enable SRIOV devices by mapping IOV BAR with M64 BARs. If a
> SRIOV device's IOV BAR is not 64bit-prefetchable, this is not assigned from
> 64bit prefetchable window, which means M64 BAR can't work on it.
> The reason is PCI bridges support only 2 memory windows and the kernel code
> programs bridges in the way that one window is 32bit-nonprefetchable and
> the other one is 64bit-prefetchable. So if devices' IOV BAR is 64bit and
> non-prefetchable, it will be mapped into 32bit space and therefore M64
> cannot be used for it.
> This patch makes this explicit and truncate IOV resource in this case to
> save MMIO space.
> Signed-off-by: Wei Yang <weiyang at linux.vnet.ibm.com>
> Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
> Acked-by: Alexey Kardashevskiy <aik at ozlabs.ru>

Series applied to powerpc next, thanks.



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