Re: ACPI hotplug

[Keshavamurthy Anil S <anil.s.keshavamurthy-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

On Thu, Jan 13, 2005 at 03:02:37PM +0100, Paul Ionescu wrote:
> Hi,
> 
> I just read that 2.6.11-rc1 does support ACPI hotplug.
> What does this really mean ?

2.6.11-rc1 now supports physical CPU hotplug and these eject files
were added to support the same. Once the cpu's are logically offlined,
they can be physically removed by echoing 1 onto the eject file
under _SB/PCI0/LSBX/CPUX/eject.


> I found some new files in /sys/firmware:
> find /sys/firmware/ | grep eject
> /sys/firmware/acpi/namespace/ACPI/_SB/PCI0/USB7/URTH/UPDK/eject
> /sys/firmware/acpi/namespace/ACPI/_SB/PCI0/USB0/URTH/UPDK/eject
> /sys/firmware/acpi/namespace/ACPI/_SB/PCI0/IDE0/SCND/MSTR/eject
> /sys/firmware/acpi/namespace/ACPI/_SB/PCI0/LPC/EC/BAT1/eject
> /sys/firmware/acpi/namespace/ACPI/_SB/PCI0/LPC/FDC/FDD0/eject

Looks like your DSDT has _EJx methods for many other types of devices,
either you can enhance these devices drivers to support user
mode eject or you can simply not create "eject" file.

> 
> But what can I do with them, and what else is there for hotplug ?
> Does it support docking stations ?

Does this "eject" file has any side effects which needs to be addressed,
please let me know.

-Anil




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