On 05/19/2017 01:39 AM, Adam Carter wrote: > On Wed, May 17, 2017 at 12:25 AM, Corbin Bird <corbinb...@charter.net > <mailto:corbinb...@charter.net>> wrote: > > On 05/16/2017 01:34 AM, Adam Carter wrote: > > Answer #1 : > > > > > > Asrock, Extreme6, 990FX, UEFI, AMD FX-9590 > > Gigabyte, GA-MA790FX-UD5P, 790FX, BIOS, AMD PhenomII x4 980 > > > > > > Hi Corbin, > > > > I noticed i didnt have x2apic enabled on my 990FX / FX-8350 system, so > > i've rebuilt/rebooted etc, but; > > > > # zgrep X2APIC /proc/config.gz > > CONFIG_X86_X2APIC=y > > # dmesg | grep -i x2apic > > # > > > > On my skylake box > > # dmesg | grep -i x2apic > > [ 0.044148] DMAR-IR: Queued invalidation will be enabled to support > > x2apic and Intr-remapping. > > [ 0.045802] DMAR-IR: Enabled IRQ remapping in x2apic mode > > [ 0.045908] x2apic enabled > > [ 0.046011] Switched APIC routing to cluster x2apic. > > > > What x2apic messages do you get on your 990FX / FX-9590 system? > > > Interesting kernel parameter for you to try : > ( from '/usr/src/linux/Documentation/kernel-parameters.txt' ) > > x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of > default x2apic cluster mode on platforms > supporting x2apic. > > With that switch I have not been getting any output in 'dmesg' about > this at all. > > > I tried adding x2apic_phys, but dmesg output did not change. > > From wikip; > "In 2012, AMD announced their /Advanced Virtual Interrupt Controller/ > (/AVIC/) targeting interrupt overhead reduction in virtualization > environments.^[33] > <https://en.wikipedia.org/wiki/X86_virtualization#cite_note-33> This > technology has materialize in hardware and (as announced) does not > support x2APIC <https://en.wikipedia.org/wiki/X2APIC>.^[34] > <https://en.wikipedia.org/wiki/X86_virtualization#cite_note-34> In 2016, > AVIC is available on the AMD family 15h models 6Xh (Carrizo) processors > and newer.^[35]" > <https://en.wikipedia.org/wiki/X86_virtualization#cite_note-35> > > So; > FX-8350 processors (bulldozer gen2) dont have AVIC > Carrizo processors (bulldozer gen4), have AVIC, but AVIC doesnt support > x2apic > seems reasonable to conclude that there's no x2apic on bulldozer gen2, > and that's why there's nothing in dmesg about it. > > > Question : > Do you have this enabled in your kernel ... > > [ ] Support for Intel IOMMU using DMA Remapping Devices > > > On the Skylake box, yes, FX box, no.
Thanks for the info. Will kill the kernel parameter on my box. --- Tried an experiment, recompiled the kernel, no GART IOMMU support. This was not enabled either. < > AMD IOMMU Version 2 driver CPU FX-9590, 990FX Chipset Now getting this instead : > [ 0.988027] PCI: CLS 64 bytes, default 64 > [ 0.988362] iommu: Adding device 0000:00:00.0 to group 0 > [ 0.988530] iommu: Adding device 0000:00:02.0 to group 1 > [ 0.988689] iommu: Adding device 0000:00:0a.0 to group 2 > [ 0.988872] iommu: Adding device 0000:00:0d.0 to group 3 > [ 0.989029] iommu: Adding device 0000:00:11.0 to group 4 > [ 0.989194] iommu: Adding device 0000:00:12.0 to group 5 > [ 0.989318] iommu: Adding device 0000:00:12.2 to group 5 > [ 0.989484] iommu: Adding device 0000:00:13.0 to group 6 > [ 0.989615] iommu: Adding device 0000:00:13.2 to group 6 > [ 0.989780] iommu: Adding device 0000:00:14.0 to group 7 > [ 0.989943] iommu: Adding device 0000:00:14.1 to group 8 > [ 0.990128] iommu: Adding device 0000:00:14.3 to group 9 > [ 0.990292] iommu: Adding device 0000:00:14.4 to group 10 > [ 0.990458] iommu: Adding device 0000:00:14.5 to group 11 > [ 0.990637] iommu: Adding device 0000:00:15.0 to group 12 > [ 0.990763] iommu: Adding device 0000:00:15.1 to group 12 > [ 0.990935] iommu: Adding device 0000:00:16.0 to group 13 > [ 0.991058] iommu: Adding device 0000:00:16.2 to group 13 > [ 0.991252] iommu: Adding device 0000:01:00.0 to group 14 > [ 0.991387] iommu: Adding device 0000:01:00.1 to group 14 > [ 0.991560] iommu: Adding device 0000:02:00.0 to group 15 > [ 0.991742] iommu: Adding device 0000:03:00.0 to group 16 > [ 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 > [ 1.065622] LVT offset 0 assigned for vector 0x400 > [ 1.065836] perf: AMD IBS detected (0x000000ff) 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) And the GART IOMMU is no longer showing as an SMbus entry. Corbin
