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SubjectRe: [PATCH] iommu/amd: Fix event counter availability check
> Instead of blindly moving the code around to a spot that would just work,
> I am trying to understand what might be required here. In this case,
> the init_device_table_dma()should not be needed. I suspect it's the IOMMU
> invalidate all command that's also needed here.
>
> I'm also checking with the HW and BIOS team. Meanwhile, could you please give
> the following change a try:

Yes, this also fixes the problem for me.
Alexander

>
> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
> index 5b81fd16f5fa..b07458cc1b0b 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -1875,6 +1875,8 @@ static int __init amd_iommu_init_pci(void)
> ret = iommu_init_pci(iommu);
> if (ret)
> break;
> + iommu_flush_all_caches(iommu);
> + init_iommu_perf_ctr(iommu);
> }
>
> /*

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