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From: "Tone Zhang (Arm Technology China)" <Tone.Zhang@arm.com>
To: "dev@dpdk.org" <dev@dpdk.org>
CC: "Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>,
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Thread-Topic: [dpdk-dev] [PATCH v3] doc: Clarify IOMMU usage with
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Date: Wed, 19 Sep 2018 07:44:36 +0000
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Subject: Re: [dpdk-dev] [PATCH v3] doc: Clarify IOMMU usage
with "uio_pci_generic" kernel module
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Hello Bruce, Luca, Rami and Stephen,
Could you please help to review the change?=20
Any comments are welcome.
Thanks a lot!
Br,
Tone
-----Original Message-----
From: dev <dev-bounces@dpdk.org> On Behalf Of tone.zhang
Sent: Wednesday, September 5, 2018 1:18 PM
To: dev@dpdk.org
Cc: Gavin Hu (Arm Technology China) <Gavin.Hu@arm.com>; bruce.richardson@in=
tel.com; bluca@debian.org; roszenrami@gmail.com; nd <nd@arm.com>
Subject: [dpdk-dev] [PATCH v3] doc: Clarify IOMMU usage with "uio_pci_gener=
ic" kernel module
If the devices used for DPDK are bound to the "uio_pci_generic" kernel modu=
le, the IOMMU should be disabled in order not to break the IO transmission =
because of the virtual / physical address mapping.
The patch clarifies the IOMMU configurations on both x86_64 and arm64 syste=
ms.
Signed-off-by: tone.zhang <tone.zhang@arm.com>
---
doc/guides/linux_gsg/linux_drivers.rst | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/=
linux_drivers.rst
index 371a817..b46fc6a 100644
--- a/doc/guides/linux_gsg/linux_drivers.rst
+++ b/doc/guides/linux_gsg/linux_drivers.rst
@@ -48,6 +48,13 @@ be loaded as shown below:
``vfio-pci`` kernel module rather than ``igb_uio`` or ``uio_pci_generic=
``.
For more details see :ref:`linux_gsg_binding_kernel` below.
=20
+.. note::
+
+ If the devices used for DPDK are bound to the ``uio_pci_generic`` kerne=
l module,
+ please make sure that the IOMMU is disabled. One can add ``intel_iommu=
=3Doff`` or
+ ``intel_iommu=3Dpt`` or ``amd_iommu=3Doff`` in GRUB command line on x86=
_64 systems,
+ or add ``iommu.passthrough=3D1`` on arm64 system.
+
Since DPDK release 1.7 onward provides VFIO support, use of UIO is optiona=
l for platforms that support using VFIO.
=20
--
2.7.4