Re: RFC: ACPI/scsi/libata integration and hotswap

[Jeff Garzik]

Matthew Garrett wrote:
> On Fri, Dec 09, 2005 at 06:58:41AM -0500, Jeff Garzik wrote:
>
>
> > If this is for hotswap, as I noted, libata doesn't need this at all.
> >
> > If the hardware supports it, then libata will support it directly. 
> > There is no ACPI-specific magic, because ACPI does nothing but talk to 
> > the same hardware libata is talking to.
>
>
> If libata knows how to talk to the random hardware attached to a Dell 
> laptop hotswap bay, I'll be amazed. Ejecting the drive generates a 
> system management interrupt, which then causes the ACPI code to check a 
> register in a block of machine-specific registers and generate an ACPI 
> notification. As far as I can tell, the controller has no say in the 
> matter at all - the Intel specs seem to suggest that ICH6 doesn't 
> generate a hotswap interrupt unless you're using AHCI (which this 
> hardware doesn't).

libata will immediately notice the ejection without ACPI's help.

	Jeff


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