linux-kernel - Re: [PATCH] iommu/amd: Fix event counter availability check

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Date:   Mon, 1 Jun 2020 19:09:29 +0300 (MSK)
From:   Alexander Monakov <amonakov@...ras.ru>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
cc:     linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org
Subject: Re: [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);
>         }
> 
>         /*