[PATCH 1/1] pci: xgene: Enable huge outbound bar support

Duc Dang dhdang at apm.com
Fri Jun 26 10:26:48 PDT 2015

On Fri, Jun 26, 2015 at 7:26 AM, Bjorn Helgaas <bhelgaas at google.com> wrote:
> Hi Duc,
> On Thu, Jun 25, 2015 at 8:05 PM, Duc Dang <dhdang at apm.com> wrote:
>> X-Gene PCIe controllers support huge outbound BARs (with size upto
>> 64GB). This patch configures additional 1 outbound BAR for X-Gene
>> PCIe controllers with size larger than 4GB. This is required to
>> support devices that request huge outbound memory (nVidia K40 as an
>> example)
> The PCI specs don't use the "outbound BAR" terminology.  I assume this
> is what we normally call "windows" or "apertures" for MMIO access by
> the CPU?  (The specs rarely use those terms either, but they're
> commonly used in Linux, and the PCIe spec does mention them a couple
> times.)

Yes, Bjorn. The "outbound BAR" that I mentioned is the MMIO window. I
will change these terms in next patch.

> By "request huge outbound memory," I assume you simply mean the device
> has a huge BAR, right?
Yes, I meant "the device has a huge BAR". I will change the
description for this in next patch as well

> Bjorn

Duc Dang.

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