Re: [Bug 42679] New: DMA Read on Marvell 88SE9128 fails when Intel's IOMMU is on

On Tue, 31 Jan 2012 00:32:11 +0100, Chris Wright [off-list ref]
wrote:

* Paweł Żak (pawel.zaq@gmail.com) wrote:

quoted

On Mon, 30 Jan 2012 22:41:32 +0100, Don Dutile [off-list ref]  wrote:

quoted

Well, the lspci dump in the bugzilla report doesn't show a device
w/BDF=0b:00.1;
so, if the SATA device (which is 0b:00.0) is spitting out 0b:00.1
as the source
of any of its DMA packets, the IOMMU will fault on it, since
0b:00.1 didn't
request DMA mappings (0b:00.0 did).
I semi-recall someone else reporting this 'feature' on this list.
Wonder if pci-quirk has to filter this case (0b:00.0 on this system  means
map for 0b:00.0 & 0b:00.1 -- ick!)

do another lspci -vvv to ensure that 0b:00.1 wasn't excluded in the  list.
if it doesn't exist, then the problem is the SATA device using an
unknown/unrecognized
BDF of 0b:00.1

Yep, that's correct. I enabled all integrated peripherals on my
motherboard and there were still no entries with BDF 0b:00.1 in
lspci -vvv output. Should I take this problem to MSI then?

Yeah, something is not right.  Is there any BIOS control over that
device?

As far as the BIOS is concerned I can only switch between:
- disabled,
- AHCI mode,
- IDE mode.

The problem occurs in both IDE and AHCI modes.

Apart from that I am also able to bring up RAID setup window for this  controller, right after turning the computer on, but since there are no  disks connected to it there's nothing I can alter.

	Paweł