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From: Sridhar S <sridhar.nest@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] Issue when the kernel parameter intel_iommu=on is being used
Date: Sun, 5 Jan 2014 18:07:45 +0530	[thread overview]
Message-ID: <CAE9sBEAzvGiwb3VVBg+V6xmSpkpzyJ0K5dDFAeS+E4PDo=Z6AA@mail.gmail.com> (raw)

Hello,



I am using DPDK 1.5 for development of host pmd for device “Connect X3”.



I am observing issue  while the ConnectX3 device DMA to a memory which is
allocated with rte_memzone_reserve_aligned() API .

The issue(please refer ERROR below) has been observed if the system runs
with the kernel parameter “intel_iommu=on”.



ERROR :

dmar: DRHD: handling fault status reg 302

dmar: DMAR:[DMA Write] Request device [01:00.0] fault addr 4f883000

DMAR:[fault reason 01] Present bit in root entry is clear


The reported "fault Addr" is the physical address which was returned by the
Above API.



I don’t see any issue with the same code when the system up with kernel
parameter intel_iommu=off.




Can you share your comments on this issue?


Thanks in advance

Sri

             reply	other threads:[~2014-01-05 12:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-05 12:37 Sridhar S [this message]
2014-01-05 17:28 ` François-Frédéric Ozog
2014-01-06 14:03   ` Sridhar S

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