Re: IO_PAGE_FAULT from SATA card during boot

["Roedel, Joerg" <Joerg.Roedel@amd.com>]

On Mon, Feb 07, 2011 at 09:04:40PM -0500, Robert Hancock wrote:
> On 02/07/2011 11:48 AM, Chris Webb wrote:
> > I've now done this, swapping in a Highpoint R620. I get the same
> > IO_PAGE_FAULT, same timeouts on the sata card, but lspci now shows up the
> > device 03:00.1. I've put the new dmesg and lspci output at
> >
> >    http://cdw.me.uk/tmp/sata-fault-hpt.dmesg
> >    http://cdw.me.uk/tmp/sata-fault-hpt.lspci
> >
> > Again, problem is present both with 2.6.32.25 and 2.6.37.
> 
> Curious.. We don't even have a driver loaded for the PATA device on that 
> chip so I don't see how we could be telling it to do anything. As far as 
> I can see there are a few possible causes: Either the device is 
> generating read requests which appear to come from the PATA function 
> rather than the SATA one for some reason, the IOMMU is picking up the 
> wrong device function for requests from that device, or something in the 
> platform is somehow misconfiguring the device to cause this error. It 
> may not be easy to figure out which one is the cause, however.

The most likely reason for this is, that the add-on card uses both
request-ids (03:00.0 and 03:00.1) for requests originating from the SATA
controler. The address in the page-fault looks like an address the IOMMU
driver would assign but from a device which has no driver loaded.
If this is a know feature of the card the BIOS should detect it an
report it in the IVRS table with an alias-range. The driver would handle
it in this situation. Otherwise it looks like a problem with the
addon-card.

		Joerg

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