Messages in this thread | | | Date | Thu, 01 Sep 2022 14:36:20 -0400 | From | Steven J Abner <> | Subject | amd iommu configuration |
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Hi Building a kernel tailored for AMD 2400g on ASRock B450 using 5.18.12 as base. I stumbled across an odd situation and which lacked Kconfig info and lead to oddity. /drivers/iommu/amd/Kconfig states 'config AMD_IOMMU_V2' is 'tristate' but unlike many other tristate configures doesn't mention that module name is 'iommu_v2.ko' and loading should be done by adding to modules-load.d.
The oddity is that by loading as module is as follows (differences):
builtin iommu_v2 version dmesg: amdgpu: HMM registered 2048MB device memory amdgpu: Topology: Add APU node [0x0:0x0] amdgpu: Topology: Add APU node [0x15dd:0x1002] AMD-Vi: AMD IOMMUv2 loaded and initialized kfd kfd: amdgpu: added device 1002:15dd kfd kfd: amdgpu: Allocated 3969056 bytes on gart memmap_init_zone_device initialised 524288 pages in 0ms
module not loaded due to missing iommu.conf dmesg: amdgpu: CRAT table disabled by module option amdgpu: Topology: Add CPU node amdgpu: Virtual CRAT table created for CPU kfd kfd: amdgpu: GC IP 090100 not supported in kfd
module load through iommu.conf dmesg: amdgpu: CRAT table disabled by module option amdgpu: Topology: Add CPU node amdgpu: Virtual CRAT table created for CPU AMD-Vi: AMD IOMMUv2 loaded and initialized kfd kfd: amdgpu: GC IP 090100 not supported in kfd
Note, only difference on witk/without iommu.conf is: AMD-Vi: AMD IOMMUv2 loaded and initialized
So does this mean missing features by not having builtin? If not, should Kconfig have hint about module and loading?
Steve
I wish to be personally CC'ed the answers/comments posted to the list in response to my posting, please:) Not a list member.
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