linux-kernel - RE: PCI: check szhi when sz is 0 when 64 bit iomem bigger than 4G

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Message-ID: <5986589C150B2F49A46483AC44C7BCA4907254@ssvlexmb2.amd.com>
Date:	Wed, 29 Nov 2006 14:08:50 -0800
From:	"Lu, Yinghai" <yinghai.lu@....com>
To:	"Andrew Morton" <akpm@...l.org>
cc:	"Greg KH" <greg@...ah.com>, "Greg KH" <gregkh@...e.de>,
	"Andi Kleen" <ak@...e.de>, linux-kernel@...r.kernel.org,
	myles@...selemur.cs.byu.edu
Subject: RE: PCI: check szhi when sz is 0 when 64 bit iomem bigger than
 4G

-----Original Message-----
From: Andrew Morton [mailto:akpm@...l.org] 
Sent: Wednesday, November 29, 2006 1:53 PM

>It has no changelog.  We're still waiting for a complete description of
the
>patch: why it is needed, what it does, how it does it.  Please provide
>that.

-----------------
For pci mem resource that size is bigger than 4G, the sz returned by
pc_size will be 0.
So that resource is skipped, and register contained hi address will be
treated as another 32bit
resource. We need to use sz64 and pci_sz64 for 64 bit resource for clear
logical.
Typical usages for this: Opteron system with co-processor and the
co-processor could take
more than 4G RAM as pre-fetchable mem resource.
-----------------

YH


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