Re: AHCI not working with VT-d enabled

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On 10/19/2011 06:04 AM, Tobias Geiger wrote:
Hi,

short description of my problem is:
with vt-d enabled in bios the sata 6g ports are not recognized;
when vt-d is disabled the sata6g ports work...

Sata ports are on
04:00.0 SATA controller: Marvell Technology Group Ltd. Device 9120 (rev 12)

kernel is 3.1.0-rc8+
Dmesg with vt-d enabled is here: http://pastebin.com/YLJU8yMJ

Thanks for your input on this!
Greetings
Tobias

I think we've had another report about this. This is the error that's being hit:

[    1.056549] DRHD: handling fault status reg 2
[    1.056612] DMAR:[DMA Write] Request device [04:00.1] fault addr fffe0000
[    1.056614] DMAR:[fault reason 02] Present bit in context entry is clear

Essentially it seems that this Marvell controller can produce PCIe transactions from the wrong device function (in this case presumably from the PATA part of the controller on function 1 instead of the AHCI part on function 0), and the IOMMU is blocking the access since the PATA function hasn't had any DMA mapping set up.

Not sure what we can do about this.. maybe some kind of PCI quirk for this device?
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