On 05/14/2017 12:31 AM, Adam Carter wrote: > Tried kernels 4.10.13 and 4.11, with > CONFIG_GART_IOMMU=y > CONFIG_IOMMU_HELPER=y > CONFIG_IOMMU_API=y > CONFIG_IOMMU_SUPPORT=y > CONFIG_IOMMU_IOVA=y > CONFIG_AMD_IOMMU=y > CONFIG_AMD_IOMMU_V2=m > Chipset is 990FX, and AFAICT the V2 is for the APU (bdver3 and 4 vintage). > > When I enable the IOMMU in the BIOS I get stack traces. Is anyone using > AMD_IOMMU successfully? If so, any tips?
----- Background / System Info : 2 systems. Chipset 990FX, FX-9590 ( -march=bdver2 / Fam15h ) Chipset 790FX, PhenomII 980 ( -march=amdfam10 / Fam10h ) Gentoo x86_64, multilib, Kernel 4.9.x IOMMU enabled in UEFI, BIOS. ----- General Info : ( if you don't know already ... ) The 990FX / 790FX Chipset doesn't have a GART / AGP Aperature or IOMMU in it. The CPU contains the original K8 IOMMU ( v1 ) engineered / converted from a GART. Standard output in '/var/log/dmesg'. > [ 0.000000] AGP: No AGP bridge found > [ 0.926911] PCI-DMA: Disabling AGP. > [ 0.927142] PCI-DMA: aperture base @ b4000000 size 65536 KB > [ 0.927263] PCI-DMA: using GART IOMMU. > [ 0.927376] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture ----- Suggestion : read the Kernel Parameter docs. The automatic setup may need tweaking. You have to do a manual setup if you want, both, a working IOMMU and an AGP Aperature. Firmware can throw a major monkey wrench into that type of setup however. > /usr/src/linux/Documentation/kernel-parameters.txt This doc has the x86_64 IOMMU options listed ... > /usr/src/linux/Documentation/x86/x86_64/boot-options.txt Question : APU? I was under the impression that those CPU's used a different chipset, not the 990FX. Corbin
