netdev - How to debug DMAR errors?

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Date:   Thu, 13 Apr 2017 11:12:12 -0700
From:   Ben Greear <greearb@...delatech.com>
To:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: How to debug DMAR errors?

Hello,

I have been seeing a regular occurrence of DMAR errors, looking something
like this when testing my ath10k driver/firmware under some specific loads
(maximum receive of 512 byte frames in AP mode):

DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [05:00.0] fault addr fd99f000 [fault reason 06] PTE Read access is not set
ath10k_pci 0000:05:00.0: firmware crashed! (uuid 594b1393-ae35-42b5-9dec-74ff0c6791ff)

So, I am wondering if there is any way I can get more information about what this fd99f000 address
is?

Once this problem hits, the entire OS locks hard (not even sysrq-boot will do anything),
so I guess I would need the DMAR logic to print out more info on that address somehow.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com