AR9882 IOMMU faults

[Ben Skeggs]

Hey,

I've just installed a COMPEX WLE600VX (AR9882) in my router machine,
operating in AP mode.

While it appears to be working well enough, I get massive floods of
IOMMU faults reported in my kernel log.  These appear to increase with
the load on the network.

I've attached both the info that ath10k reports when it detects the
device, and a sample of one of the DMAR messages (worth nothing that
it's the same fault address in all the messages).

Is this a known issue, and anything I can do to help get it resolved?

Thanks,
Ben.
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Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: Direct firmware load for ath10k/cal-pci-0000:04:00.0.bin failed with error -2
Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: qca988x hw2.0 target 0x4100016c chip_id 0x043222ff sub 0000:0000
Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 0 testmode 0
Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: firmware ver 10.2.4.70.52 api 5 features no-p2p,raw-mode,mfp crc32 67c4d25c
Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/board-2.bin failed with error -2
Jul 08 14:53:08 ramiel kernel: ath10k_pci 0000:04:00.0: board_file api 1 bmi_id N/A crc32 bebc7c08

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[ 1272.056416] DMAR: DRHD: handling fault status reg 3
[ 1272.057129] DMAR: DMAR:[DMA Write] Request device [04:00.0] fault addr ff9c0000 
               DMAR:[fault reason 05] PTE Write access is not set

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