Re: [ACPI] Re: [RFC/Patch 0/12] ACPI based root bridge hot-add

Re: [ACPI] Re: [RFC/Patch 0/12] ACPI based root bridge hot-add

[Paul Ionescu]

Hi Rajesh,

--- Rajesh Shah <rajesh.shah@intel.com> wrote:
> On Sat, Mar 19, 2005 at 03:50:16PM +0200, Paul Ionescu wrote:
> > 
> > Does this mean that when it will be ported for i386, I will be able to
> > really use my Docking Station ?
> 
> No. The current patches only trigger when a _root_ bridge is
> hot-added, not a PCI to PCI bridge (which is what the docking 
> station is). The code to support p2p bridge hotplug will benefit
> from these patches but more code is needed to support that.
> 

Thanks for the info.
Is p2p hotplug in your roadmap (for i386) ?
Can you please give me an example of a root bridge ?

Thanks,
Paul



		
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Re: [ACPI] Re: [RFC/Patch 0/12] ACPI based root bridge hot-add

[Rajesh Shah]

On Mon, Mar 21, 2005 at 12:34:07PM -0800, Paul Ionescu wrote:
> 
> --- Rajesh Shah <rajesh.shah@intel.com> wrote:
> > 
> > No. The current patches only trigger when a _root_ bridge is
> > hot-added, not a PCI to PCI bridge (which is what the docking 
> > station is). The code to support p2p bridge hotplug will benefit
> > from these patches but more code is needed to support that.
> > 
> 
> Thanks for the info.
> Is p2p hotplug in your roadmap (for i386) ?
> Can you please give me an example of a root bridge ?
> 
I believe others are already working on it. I expect to free up
a bit more in a couple of weeks.  If I don't see any patches or
indication of activity by then, I'll work on adding this support
too.

Rajesh

[RFC/Patch 0/12] ACPI based root bridge hot-add

[Rajesh Shah]

Here is a series of patches to support ACPI hot-add of a root
bridge hierarchy. The added hierarchy may contain other p2p 
bridges and end/leaf I/O devices too. The root bridge itself is
assumed to have been assigned resource ranges, but the p2p
bridges and end devices are not required to be initialized by
firmware. Most of the code changes are to make the existing code
flows suitable for such a hierarchy of bridges & devices.

This code supports hot-add on ia64 only for now.It does not yet
support I/O APIC hot-add, which is needed to make this fully
functional.  The patches are against 2.6.11-mm4 (plus the patch 
needed for ia64 to boot). I've tested to make sure this does not 
break end/leaf device hotplug on the hotplug capable ia64 box I have.

Thanks,
Rajesh

Re: [RFC/Patch 0/12] ACPI based root bridge hot-add

[Paul Ionescu]

On Fri, 18 Mar 2005 13:38:57 -0800, Rajesh Shah wrote:

> Here is a series of patches to support ACPI hot-add of a root bridge
> hierarchy. The added hierarchy may contain other p2p bridges and end/leaf
> I/O devices too. The root bridge itself is assumed to have been assigned
> resource ranges, but the p2p bridges and end devices are not required to
> be initialized by firmware. Most of the code changes are to make the
> existing code flows suitable for such a hierarchy of bridges & devices.
> 
> This code supports hot-add on ia64 only for now.It does not yet support
> I/O APIC hot-add, which is needed to make this fully functional.  The
> patches are against 2.6.11-mm4 (plus the patch needed for ia64 to boot).
> I've tested to make sure this does not break end/leaf device hotplug on
> the hotplug capable ia64 box I have.
> 
> Thanks,
> Rajesh

Does this mean that when it will be ported for i386, I will be able to
really use my Docking Station ?
Does it rescan the DSDT to find new additions to ACPI devices ?

I have an IBM docking station with a PCI bus inside and some other
devices, and when I hot plug my IBM ThinkPad T41 in it, it does not
recognize those devices. Only if I boot in dock they are usable.
And the DSDT is different if I boot in dock or not.
So I wander if this patch would help me to hot plug my T41 in the dock and
all devices will be recognized. (when the patch will be for i386 too)


Thx,
Paul

Re: [ACPI] Re: [RFC/Patch 0/12] ACPI based root bridge hot-add

[Rajesh Shah]

On Sat, Mar 19, 2005 at 03:50:16PM +0200, Paul Ionescu wrote:
> 
> Does this mean that when it will be ported for i386, I will be able to
> really use my Docking Station ?

No. The current patches only trigger when a _root_ bridge is
hot-added, not a PCI to PCI bridge (which is what the docking 
station is). The code to support p2p bridge hotplug will benefit
from these patches but more code is needed to support that.

> Does it rescan the DSDT to find new additions to ACPI devices ?
> 
It scans the ACPI namespace under the root bridge that was added.
Any pci devices underneath are scanned and added, but there isn't
any code to look for non-PCI devices there.

Rajesh