Hi Alejandro, On 1/18/2017 12:27 PM, Alejandro Lucero wrote: > For using a DPDK app when iommu is enabled, it requires to > add iommu=pt to the kernel command line. But using igb_uio driver > makes DMAR errors because the device has not an IOMMU domain.
Please help to understand the scope of the problem, 1- How can you re-produce the problem? 2- What happens get DMAR errors, is it prevents device work or some annoying error messages? 3- Can you please share the error messages? > > Since kernel 3.15, iommu=pt requires to use the internal kernel > DMA API for attaching the device to the IOMMU 1:1 mapping, aka > si_domain. Previous versions did attach the device to that > domain when intel iommu notifier was called. Again, what is not working since 3.15? > > This is not a problem if the driver does later some call to the > DMA API because the mapping can be done then. But DPDK apps do > not use that DMA API at all. Is this same/similar with: http://dpdk.org/dev/patchwork/patch/12654/ > > Doing this dma map and unmap is harmless even when iommu is not > enabled at all. > > Signed-off-by: Alejandro Lucero <alejandro.luc...@netronome.com> <...> Thanks, ferruh
