Messages in this thread | | | Date | Thu, 10 Nov 2016 17:16:19 +0100 | From | Joerg Roedel <> | Subject | Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback |
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On Thu, Nov 10, 2016 at 04:07:08PM +0000, Robin Murphy wrote: > On 10/11/16 15:46, Joerg Roedel wrote: > > On Fri, Nov 04, 2016 at 11:24:06AM +0000, Eric Auger wrote: > >> + resource_list_for_each_entry(window, &bridge->windows) { > >> + if (resource_type(window->res) != IORESOURCE_MEM && > >> + resource_type(window->res) != IORESOURCE_IO) > >> + continue; > > > > Why do you care about IO resources? > > [since this is essentially code I wrote] > > Because they occupy some area of the PCI address space, therefore I > assumed that, like memory windows, they would be treated as P2P. Is that > not the case?
No, not at all. The IO-space is completly seperate from the MEM-space. They are two different address-spaces, addressing different things. And the IO-space is also not translated by any IOMMU I am aware of.
Joerg
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