Hi,
I am getting these errors from a userspace 'device driver' ,
[599805.585424] DMAR: DRHD: handling fault status reg 202
[599805.585431] DMAR: DMAR:[DMA Read] Request device [03:00.0] fault addr
4c0008000
DMAR:[fault reason 06] PTE Read access is not set
Basicly i mapp a dma engine in a PCIe card by uio to a userspace library,
and then allocate hugepages ( continous ), do a virt to phys translation
via /proc/self/.... setup a dma and turn it on.
The message tells me I lack iommu mappings for the memory regions i try to
read/write , so far so good nothing unexpected.
My problem is that I have to run with intel_iommu=on iommu=pt flags to the
kernel due to other hard/software on the machine, I can't turn iommu off
completely.
So I have the question is it possible to add iommu mappings from userspace
? through iommu groups in /sys/.. ?
So far all applications that does something similar either uses vfio or
some kernel driver callback and I would prefer not to do this.
( I had high hopes for dpdk pmd driver but so far no luck ).
All hints and help appreciated ! :-D
/ regards, Lars Segerlund.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
