Messages in this thread | | | Subject | Re: [PATCH] PCI: Clear bridge MEM_64 flag if one child does not support it | From | Benjamin Herrenschmidt <> | Date | Tue, 09 Dec 2014 09:56:12 +1100 |
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On Mon, 2014-12-08 at 13:52 -0800, Yinghai Lu wrote: > 2. or scan the children resource other than ROM to clear bridge MEM_64 > for mmio pref. > > The patch is using second way so will keep child mmio pref into bridge > mmio pref range.
That means that having a single ROM BAR that is 32-bit and prefetchable will downgrade the entire window to 32-bit ? That's not going to work either.
I have GPUs with 16G BARs for example... suddenly they don't fit anaymore because we downgraded the window to 32 bit because somewhere there's a 32-bit pref resource ?
That will break more than it fixes...
Ben.
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