linux-kernel - Re: [PATCH 3/3] Altix: Add ACPI SSDT PCI device support (hotplug)

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Date:	Mon, 29 Jan 2007 16:12:24 -0800
From:	Greg KH <gregkh@...e.de>
To:	Len Brown <lenb@...nel.org>
Cc:	Andrew Morton <akpm@...l.org>, John Keller <jpk@....com>,
	linux-acpi@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, pcihpd-discuss@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, ayoung@....com, jes@....com,
	"Starikovskiy, Alexey" <alexey.y.starikovskiy@...ux.intel.com>
Subject: Re: [PATCH 3/3] Altix: Add ACPI SSDT PCI device support (hotplug)

On Sat, Jan 27, 2007 at 02:04:43AM -0500, Len Brown wrote:
> From: John Keller <jpk@....com>
> 
> Support for dynamic loading and unloading of ACPI SSDT tables upon slot
> hotplugs and unplugs.
> 
> On SN platforms, we now represent every populated root bus slot with a single
> ACPI SSDT table containing info for every device and PPB attached to the slot.
>  These SSDTs are generated by the prom at initial boot and hotplug time.  The
> info in these SSDT tables is used by the SN kernel IO "fixup" code (which is
> called at boot and hotplug time).
> 
> On hotplugs (i.e.  enable_slot()), if running with an ACPI capable prom,
> attempt to obtain a new ACPI SSDT table for the slot being hotplugged.  If
> successful, add the table to the ACPI namespace (acpi_load_table()) and then
> walk the new devices and add them to the ACPI infrastructure (acpi_bus_add()).
> 
> On hot unplugs (i.e.  disable_slot()), if running with an ACPI capable prom,
> attempt to remove the SSDT table associated with the slot from the ACPI
> namespace (acpi_unload_table_id()) and infastructure (acpi_bus_trim()).
> 
> From: John Keller <jpk@....com>
> 
>  A bug was fixed where the sgi hotplug driver was removing
>  the slot's SSDT table from the ACPI namespace a bit too early in
>  disable_slot(). Also, we now call acpi_bus_start() subsequent
>  to acpi_bus_add().
> 
> Signed-off-by: Aaron Young <ayoung@....com>
> Cc: Greg KH <greg@...ah.com>

This should go through Kristen, as she is now the pci hotplug
maintainer, not I.

thanks,

greg k-h
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