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

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Date:	Tue, 29 May 2012 13:50:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>,
	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 05/29/2012 01:46 PM, Yinghai Lu wrote:
> 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.
> 

That barely parses, never mind makes sense.

>>
>>> 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?
> 

The bus-side address space should not be more than 32 bits no matter
what.  As Bjorn indicates, you seem to be mixing up bus and cpu
addresses all over the place.

	-hpa

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