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    SubjectRe: [PATCH -v2] pci: clear bridge resource size if BIOS assign bad one
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    On Friday, June 11, 2010 02:44:42 am Yannick Roehlly wrote:
    > Le Thursday 10 June 2010 01:30:31 Bjorn Helgaas, vous avez écrit :
    > > On Tuesday, June 08, 2010 05:36:33 pm Yinghai Lu wrote:
    > > > On 06/08/2010 03:48 PM, Bjorn Helgaas wrote:
    > > > > On Tuesday, June 08, 2010 03:43:50 pm Jesse Barnes wrote:
    > > > >
    > > > > In this case, the aperture *size* from the BIOS is actually OK, but
    > > > > the beginning of the aperture overlaps system memory. With Yinghai's
    > > > > patch, we reduce the size and move the start. Windows was able to
    > > > > just move the start of the aperture and preserve the original
    > > > > 0x20000000 size (but I think it had to move something else out of
    > > > > the way).
    > > >
    > > > are you sure? that looks more aggressive.
    > >
    > > I don't have the machine and can't be 100% sure, but based on what
    > > Yannic reported here:
    > > https://bugzilla.kernel.org/show_bug.cgi?id=16009#c11, it looks like
    > > Windows moved that aperture.
    > >
    > > I haven't used it myself, but possibly a program like SIV
    > > (http://rh-software.com/) would give more detailed information
    > > about what Windows is doing.
    >
    > Hi Bjorn,
    >
    > I don't know if it's useful, but here some output of SIV concerning PCI and
    > the Radeon card.

    Can SIV generate a big dump of similar output for all devices at once?
    Then I could avoid bugging you for "look at this, look at that," etc :-)

    I'm particularly interested in the bridges (the PCIe root ports, in
    this case). I think Windows moved the 00:01.0 prefetchable aperture.
    We know from the Linux dmesg that the 00:01.0 bridge was initially
    configured like this:

    pci 0000:00:01.0: PCI bridge to [bus 01-01]
    pci 0000:00:01.0: bridge window [io 0x7000-0x9fff]
    pci 0000:00:01.0: bridge window [mem 0xfdd00000-0xfddfffff]
    pci 0000:00:01.0: bridge window [mem 0xbdf00000-0xddefffff 64bit pref]

    Based on https://bugzilla.kernel.org/show_bug.cgi?id=16009#c11, I think
    Windows moved the prefetchable aperture:

    Plage mémoire: 00000000FDD00000 - 00000000FDDFFFFF
    Plage mémoire: 00000000C0000000 - 00000000DFFFFFFF <== moved
    Plage d'E/S: 7000 - 9FFF

    Note that the aperture size is still 0x20000000.

    Since this new [mem 0xc0000000-0xdfffffff] aperture would conflict
    with this 00:1c.4 aperture:

    pci 0000:00:1c.4: bridge window [mem 0xddf00000-0xdfefffff 64bit pref]

    I think it's likely that Windows moved the 1c.4 aperture as well (or
    maybe even disabled it, since it leads to buses 06-07, and there are
    no devices on those buses).

    Bjorn
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