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    SubjectRe: [PATCH 0/5][RFC] Physical PCI slot objects
    Date
    On Tuesday 13 November 2007 02:30:49 pm Greg KH wrote:
    > On Tue, Nov 13, 2007 at 01:36:45PM -0700, Alex Chiang wrote:
    > > * Greg KH <greg@kroah.com>:
    > > > IBM sells a program that does this for server rooms. It's
    > > > probably part of some Tivoli package somewhere, sorry I don't
    > > > remember the name. I did see it working many years ago and it
    > > > required no kernel changes at all to work properly.

    Do you know how this Tivoli package works or where it gets the
    information?

    > > Like I said in an earlier email, HP ia64 systems will require a
    > > kernel change to get this information. Whether it comes via a
    > > generic ACPI access layer like dev_acpi, or something like this
    > > patch series, the kernel will still get touched.
    >
    > And like I said, I'm pretty sure you don't need to touch the kernel
    > today as there are people doing this just fine from userspace without
    > any kernel changes needed :)

    I think you are assuming userspace can just dump the raw ACPI tables
    and extract this information from them. But I don't think that's
    possible because _SUN is a method that can contain arbitrary AML.
    That AML has to be *executed*, and you can't do that safely in
    userspace.

    Bjorn
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