[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 #6 from Neil (ledufff@xxxxxxxxxxx) ---
Hello, Suravee,  I tried your patch in my Thinkpad E495. With RFCv1 and had no
success, I'm sorry I forgot to save a dmesg for that, but I am sure it was like
no patch was used, it was the same dmesg as before.

I had success with RFCv2,  and got the following:

[    0.606952] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    0.607117] pci 0000:00:00.2: can't derive routing for PCI INT A
[    0.607118] pci 0000:00:00.2: PCI INT A: not connected
[    0.607169] pci 0000:00:01.0: Adding to iommu group 0
[    0.607180] pci 0000:00:01.1: Adding to iommu group 1
[    0.607191] pci 0000:00:01.2: Adding to iommu group 2
[    0.607204] pci 0000:00:01.3: Adding to iommu group 3
[    0.607215] pci 0000:00:01.6: Adding to iommu group 4
[    0.607238] pci 0000:00:08.0: Adding to iommu group 5
[    0.607249] pci 0000:00:08.1: Adding to iommu group 6
[    0.607257] pci 0000:00:08.2: Adding to iommu group 5
[    0.607271] pci 0000:00:14.0: Adding to iommu group 7
[    0.607279] pci 0000:00:14.3: Adding to iommu group 7
[    0.607307] pci 0000:00:18.0: Adding to iommu group 8
[    0.607314] pci 0000:00:18.1: Adding to iommu group 8
[    0.607321] pci 0000:00:18.2: Adding to iommu group 8
[    0.607328] pci 0000:00:18.3: Adding to iommu group 8
[    0.607336] pci 0000:00:18.4: Adding to iommu group 8
[    0.607343] pci 0000:00:18.5: Adding to iommu group 8
[    0.607350] pci 0000:00:18.6: Adding to iommu group 8
[    0.607357] pci 0000:00:18.7: Adding to iommu group 8
[    0.607368] pci 0000:01:00.0: Adding to iommu group 9
[    0.607380] pci 0000:02:00.0: Adding to iommu group 10
[    0.607392] pci 0000:03:00.0: Adding to iommu group 11
[    0.607403] pci 0000:04:00.0: Adding to iommu group 12
[    0.607434] pci 0000:05:00.0: Adding to iommu group 13
[    0.607474] pci 0000:05:00.1: Adding to iommu group 14
[    0.607493] pci 0000:05:00.2: Adding to iommu group 14
[    0.607511] pci 0000:05:00.3: Adding to iommu group 14
[    0.607530] pci 0000:05:00.4: Adding to iommu group 14
[    0.607548] pci 0000:05:00.5: Adding to iommu group 14
[    0.607566] pci 0000:05:00.6: Adding to iommu group 14
[    0.607571] pci 0000:06:00.0: Adding to iommu group 5
[    0.609950] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    0.609951] pci 0000:00:00.2: AMD-Vi: Extended features (0x4f77ef22294ada):
[    0.609952]  PPR NX GT IA GA PC GA_vAPIC
[    0.609954] AMD-Vi: Interrupt remapping enabled
[    0.609954] AMD-Vi: Virtual APIC enabled
[    0.610822] AMD-Vi: Lazy IO/TLB flushing enabled
[    0.611644] amd_uncore: AMD NB counters detected
[    0.611647] amd_uncore: AMD LLC counters detected
[    0.611963] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4
counters/bank).

I will attach the full dmesg later.
Should I try the v3?  
Is there anything else apart from booting and checking dmesg that I can do to
test your patch?

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