linux-kernel - Re: [PATCH v3 3/5] PCI: Skip IORESOURCE_MMIO allocation for root bus without MMIO range

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Message-ID: <CAE9FiQU4gqpFOLTGV8FLhdNW-EVOOtXHQqpOOY85yUemmb-3iQ@mail.gmail.com>
Date:	Tue, 7 May 2013 20:57:44 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] PCI: Skip IORESOURCE_MMIO allocation for root bus
 without MMIO range

On Tue, May 7, 2013 at 6:16 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> On Tue, 2013-05-07 at 15:44 -0700, Yinghai Lu wrote:
>> x86 32 socket system, we may need to leave more mmiol for only several
>> sockets to make them work with cards that does not support mmio 64 bit
>> pref.
>
> Ok, while on POWER each root bridge has its own distinct 32-bit space
> (mapped elsewhere in CPU space). So at least we don't have *that*
> specific problem :-)

Hope x86 could support that.

Yinghai
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