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Date:	Mon, 05 Jan 2015 17:25:25 +0200
From:	Raimonds Cicans <>
Subject: Question about: AMD-Vi: Event logged [IO_PAGE_FAULT ...


After kernel upgrade (3.13 => 3.17) I started to receive following 
string in my logs:
AMD-Vi: Event logged [IO_PAGE_FAULT device=08:00.0 domain=0x001c 
address=0x0000000001355000 flags=0x0000]

I would like to deeper understand this problem, so it
would be nice if some body can fix my assumptions and
answer my questions.


1) This message is generated by AMD IOMMU subsystem
      because PCIe device 08:00.0 tried to access memory
      region which was not mapped to any real memory
      (lspci show that this device is DVB-S2 receiver card
       TBS 6981)

2) Because flags are 0 and because in general receivers
     write to memory not read from memory it is memory
     write operation

3) Possible causes:
     a) memory region was never mapped
     b) device accessed memory region before it was mapped
     c) device accessed memory region after it was unmapped

3) Suspects:
      a) kernel's DMA subsystem: very unlikely
      b) kernel's IOMMU subsystem: very unlikely
      c) AMD IOMMU driver: unlikely? - i had problems with AMD IOMMU
          itself in kernels 3.14 - 3.17 (AMD-Vi: Completion-Wait loop 
timed out)
          So maybe this problem not fully fixed?
      d) Receiver's driver: likely

1) What 'domain=0x001c' mean?
2) Where I can find definition of possible flags?
3) What kind of address is written in message?
      - physical?
      - virtual?
      - address from devices point of view?

Thank you.

Raimonds Cicans
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