On 14-May-18 11:44 AM, Rosen Xu wrote:
Read IOMMU attributes from linux kernle 4.10.0 error.
s/kernle/kernel :)
Cc: sta...@dpdk.org
Signed-off-by: Rosen Xu <rosen...@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/doc/guides/rel_notes/known_issues.rst
b/doc/guides/rel_notes/known_issues.rst
index afcc2c4..74876ff 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -714,3 +714,24 @@ igb_uio can not be used when running l3fwd-power
**Driver/Module**:
``igb_uio`` module.
+
+
+linux kernel iommu attribute read error
Should this be capitalized?
+---------------------------------------
+
+**Description**:
+ Read immu attributes from
/sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in linux kernel
+ 4.10.0 error. That because the link between the iommu sysfs-device and the
struct intel_iommu
+ is no longer stored as driver-data.
s/immu/IOMMU/, and i think this needs to be rewritten to something like
as follows:
Reading IOMMU attributes from
/sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in Linux kernel
4.10.0 results in an error. This is because the link between the IOMMU
sysfs-device and struct intel_iommu is no longer stored as driver-data.
(i have no idea what that last sentence means, maybe someone could help
provide a better explanation?)
+
+**Implication**:
+ When insmod ``vfio-pci`` and running testpmd APP, it doesn't initiate
properly.
Should probably be reworded as follows:
When binding devices to VFIO and attempting to run testpmd application,
testpmd (and other DPDK applications) will not initialize.
+
+**Resolution/Workaround**:
+ Use other linux kernel version. It only happens in linux kernel 4.10.0.
+
+**Affected Environment/Platform**:
+ ALL OS of linux kernel 4.10.0.
+
+**Driver/Module**:
+ ``vfio-pci`` module.
--
Thanks,
Anatoly
