Re: [PATCH 1/3] PCI: Introduce pci_bus_addr_t
From: David Miller
Date: Fri Apr 03 2015 - 15:06:06 EST
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Date: Fri, 3 Apr 2015 13:59:39 -0500
> On Tue, Mar 31, 2015 at 07:57:47PM -0700, Yinghai Lu wrote:
>> David Ahern found commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows
>> to fit in upstream windows") broke booting on sparc/T5-8.
>> In the boot log, there is
>> pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address
>> but that only could happen when dma_addr_t is 32-bit.
>> According to David Miller, all DMA occurs behind an IOMMU and these
>> IOMMUs only support 32-bit addressing, therefore dma_addr_t is
>> 32-bit on sparc64.
>> Let's introduce pci_bus_addr_t instead of using dma_addr_t,
>> and pci_bus_addr_t will be 64-bit on 64-bit platform or X86_PAE.
> I propose the following doc updates (I can just fold them into this patch
> if you approve):
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