linux-kernel - Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first

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Message-ID: <CAE9FiQUWMAdU5jtKfq1_=1E-574gW-Afo8Pby49mUFQYFrs9Pw@mail.gmail.com>
Date:	Tue, 29 May 2012 13:46:03 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Newbury <steve@...wbury.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first

On Tue, May 29, 2012 at 12:03 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 05/29/2012 11:17 AM, Yinghai Lu wrote:
>>
>> pci bridge could support 16bits and 32bits io port.
>> but we did not record if 32bits is supported.
>>
>
> Okay, so this is the actual problem, no?

their fw could not need kernel help to allocate io ports, or they are
only use device that support 32bit ioport.

>
>> so during allocating, could have allocated above 64k address to non
>> 32bit bridge.
>>
>> but  x86 is ok, because ioport.end always set to 0xffff.
>> other arches with IO_SPACE_LIMIT with 0xffffffff or
>> 0xffffffffffffffffUL may have problem.
>
> The latter is nonsense, the PCI-side address space is only 32 bits wide.
>
maybe they have unified io include ioport and mem io?

Yinghai
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