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Date: Tue, 29 May 2012 12:03:21 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Yinghai Lu <yinghai@kernel.org>
CC: Bjorn Helgaas <bhelgaas@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Steven Newbury <steve@snewbury.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first
References: <1337754877-19759-1-git-send-email-yinghai@kernel.org> <1337754877-19759-3-git-send-email-yinghai@kernel.org> <CA+55aFzd1BWqidt95qZLc1x_YU=WeGS=mKUOMvO_3omOhc_5VA@mail.gmail.com> <CAE9FiQXx_x9M5ncLk4DyL8heYQTcsHZt2JofFMjPfUd4mympeA@mail.gmail.com> <CAE9FiQX=ECg5BmKm7B2ua_rZ6bOsceeHNsfFQRWBbNZx+8sBfw@mail.gmail.com> <20120525043651.GA1391@google.com> <CAE9FiQXvYH4zCqp_uOb2nw7jvm8B=q3yx1tCjJUT+PkdymYEuw@mail.gmail.com> <CAE9FiQW0rm2_sKdSCWs3TfatJB9yHwvmvt9_vBYMtOq_YBbmfw@mail.gmail.com> <20120525193716.GA8817@google.com> <CAE9FiQWrZaBpT1fzC_-mSBfDd4AKGrdGomPxVNSU-SFPrVNvOw@mail.gmail.com> <CAErSpo7d+zn-qgWKcbro7yneXRtmZQCOHi+kiGzYUTfs+aiF4g@mail.gmail.com> <CAE9FiQUWWO75WP3gYRwYbyO_ZiWwyjKnzMxOGhfjY4H98w2Hbw@mail.gmail.com> <CAErSpo46fCCFCijNfMzGYP__pP6hkPFurMS=1=wSAZsg5z0-Lg@mail.gmail.com> <CAE9FiQWUrkKEpLmEn9kzkKOtEtX7-R8shdVSKGgSyHezKpzJCw@mail.gmail.com> <4FC50E09.4000204@zytor.com> <CAE9FiQUtio=dut3A9+jCcsgUWEeNYcpqLP6RpqGOZUfPPAtHWw@mail.gmail.com>
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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?

> 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.

	-hpa