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    SubjectRe: [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used
    Andreas Herrmann wrote:
    > On Thu, Sep 13, 2007 at 01:53:15PM +0200, Andi Kleen wrote:
    >> On Thursday 13 September 2007 12:47, Greg KH wrote:
    >>> On Thu, Sep 13, 2007 at 11:47:42AM +0200, Andi Kleen wrote:
    >>>> On Thursday 13 September 2007 04:21, Yinghai Lu wrote:
    >>>>> [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is
    >>>>> used.
    >>>>> reuse pci_cfg_space_size but skip check pci express and pci-x CAP ID.
    >>>> I just rejected a similar patch -- this should be done using MMCONFIG
    >>> But what about for broken machines without the proper MMCONFIG entries?
    >>> They still need a way to get access to this config space,
    >> If there are any devices that need it. IBS and PCI-E error handling
    >> do, but they're quite obscure.
    >> Also so far we don't know of any Fam 10h systems without MMCONFIG
    >> entries. Fam10h requires a new BIOS so it's reasonable to assume
    >> that the new BIOSes will do better.
    > IMHO support for all config space access methods should be added to the kernel.
    > And it should be added at a central point. Not waiting for drivers to do it
    > their own way if they need to use it.
    > The more complicated/important question is how to decide which access method
    > should be used for a device. (Something similar to the pci_mmcfg_fallback_slots
    > stuff that exists already for K8 NB.)
    > But that needs some more thinking.
    > Here a summary wrt family 10h extended config space access methods.
    > (Most of this stuff I verified with some patched kernels. I didn't
    > eavesdropping on the physical links though ...)
    > For family 10h we have 3 methods
    > (1) "legacy" MMCONFIG access (via south bridge)
    > (2) mmconfig access via CPU/NB (new with fam10h, using the new MMIO
    > config base MSR)
    > (3) CF8/CFC ECS access (new with fam10h, has to be enabled in the NB_CFG MSR)

    ECS access in NB_CFG_MSR is always enabled. because BIOS need to use that to do mem initialization.

    mmconfig enablement in BIOS is depending ....

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