On 05/21/2017 06:12 PM, Adam Carter wrote: > <snip> > > > [ 0.991863] iommu: Adding device 0000:06:00.0 to group 12 > > [ 0.991982] iommu: Adding device 0000:07:04.0 to group 12 > > [ 1.063849] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40 > > [ 1.063962] AMD-Vi: Interrupt remapping enabled > > [ 1.064145] AMD-Vi: Lazy IO/TLB flushing enabled > > [ 1.065331] perf: AMD NB counters detected > > > I'm similar, but have a couple of extra entries. I've read a little bit > about them, but so far am unable to determine if their existence > indicates a better or worse kernel config. > > [ 1.036309] AMD-Vi: Lazy IO/TLB flushing enabled > [ 1.036419] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) > [ 1.036529] software IO TLB [mem 0xba61a000-0xbe61a000] (64MB) mapped > at [ffffa3b87a61a000-ffffa3b87e619fff] > [ 1.036744] perf: AMD NB counters detected > > And the Linux AGP Driver ( in-kernel ) is working now. > > Now this is showing properly with lspci : > 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD/ATI] RD890S/RD990 I/O > Memory Management Unit (IOMMU) > > > Same.
The (SWIOTLB) should not be the default. What kernel parameters for IOMMUs are you using now? The listed result I posted is with nothing related to IOMMUs in the kernel parameters, and NO GART IOMMU support compiled. Corbin
