Re: misc questions about the device&driver arch

From: John Baldwin (jhb_at_freebsd.org)
Date: 11/29/05

  • Next message: Warner Losh: "Re: misc questions about the device&driver arch" 
    To: kylin <fierykylin@gmail.com>
Date: Tue, 29 Nov 2005 14:49:44 -0500

    On Thursday 10 November 2005 05:48 am, kylin wrote:
    > Sir ,i am still puzzled by the windows and freebsd arch similar.
    > 1
    > the window TPS say that windwo allocate the resource window in default
    > size of 1M or 2M,so there may be hole ,does that happen in freebsd 5
    > or 6?

    No.

    > 2
    > in my view i believe that freebsd us the "just enough "tactics,so
    > the nexus level of resource view is ===continuous====with NO hole in
    > a boot up system, IF hot remove do not happen .am i right?

    Sorta. We actually will use whatever the BIOS uses by default. We only try
    to alloc resources if the BIOS doesn't, and I'm not sure how we handle a
    bridge running out of resources. I think we might just fail the allocation.

    > 3
    > IF i do a PCI hotplug under a bridge, and the bridge 's MEM Window is
    > full ,i have to do reballacne (including use the device_pause
    > method:)), and if i can not declaim the resource from other bridge
    > because "nexus level of resource view is ===continuous====with NO hole
    > ", can i extend the physical address space beyond the boot time
    > locate range to PCI host bridge ?

    Well, if you had device_pause() you would be able to shuffle resources from
    one bridge to another perhaps. Preallocating bigger chunks as your first
    question suggested might be a lot simpler though not completely fool proof.

    > On 11/6/05, John Baldwin <jhb@freebsd.org> wrote:
    > > On Sunday 06 November 2005 06:14 am, kylin wrote:
    > > > On 11/6/05, M. Warner Losh <imp@bsdimp.com> wrote:
    > > > > In message:
    > > > > <87ab37ab0511032030o134b9316j83295dd303e4e44b@mail.gmail.com>
    > > > >
    > > > > kylin <fierykylin@gmail.com> writes:
    > > > > : ///////////////
    > > > > : pci bridge dynamic resize
    > > > > : /////////////
    > > > > : it seems that the device arch of freebsd is similar to what is
    > > > > : revealed in window OS. i have read the pcie hotplug tps of windows
    > > > > : longhorn ,it is said that with some hardware mechanisms the pci
    > > > > : bridge driver can do global pci resource window reconfiguration.so
    > > > > : good to the hotplugin pci device for it avoid prelocating resource
    > > > > : for the device .
    > > > > : i wonder ,if the mem /io/irq reconfiguration possible under freebsd
    > > > > : .:) 1
    > > > >
    > > > > Yes. Cardbus does it all the time. However, there's no pcie
    > > > > hot-plug support yet, so the process for kicking off configuration of
    > > > > the new device doesn't happen.
    > > > >
    > > > > Warner
    > > >
    > > > sorry for my poor grammar ,i think i confused the public:) i will make
    > > > myself clear with the words below about the PCI Multi-level Rebalance
    > > >
    > > > PCI Multi-level Rebalance in Windows Longhorn
    > > > Updated: November 25, 2003
    > >
    > > No, FreeBSD doesn't currently do what this decribes yet. It would be
    > > possible to do it by adding a new device_pause() method that drivers
    > > would be required to implement while the resources were shuffled around
    > > though and possibly a device_unpause() method so that they could update
    > > their state if their resources were changed while the device was paused.
    > >
    > > --
    > > John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
    > > "Power Users Use the Power to Serve" = http://www.FreeBSD.org
    >
    > --
    > we who r about to die,salute u! 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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  • Next message: Warner Losh: "Re: misc questions about the device&driver arch"

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