[Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter

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https://bugzilla.kernel.org/show_bug.cgi?id=201753

--- Comment #17 from David Coe (david.coe@xxxxxxxxxx) ---
Again, good day!

Two re-builds using Alex's (one-line) patch, for kernels 5.8.18 and 5.10.11.
Both give on the Ryzen 2400G:

[    0.374138] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    0.374141] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    0.375457] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4
counters/bank).
[    0.626269] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@xxxxxxx>

I don't know how significant an extra 125 msec on boot time is but, on grounds
of simplicity and elegance, I'd vote for Alex :-). Are there any downsides?

Much appreciated all.

David

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