Comment 125 for bug 1810239
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#125 |
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0e1f616
(Get the code!)
The quirk installs entries for both function numbers. If function 1 would have been unknown, you would have seen warnings about presence bit not set (see comment 78 as example). The lack of those messages indicates that you successfully installed entries for both function 0 and 1, hence that the patch is working.
You can still run into problems if the chip tries to read/write memory that isn't allocated by the driver module. The problems I saw was related to the controller being initiated and used by the BIOS during boot. It tried to read memory that didn't belong to it (as fas as the linux kernel was concerned). The controller stopped working when the DMA read failed (blocked by the iommu).
It is not necessarily an error that the controller is assigned memory during boot. Although these memory regions must be presented to the operating system. This is where the vt-d support seems to fail on many consumer boards.