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Subject: Re: [PATCH] iommu/amd: Fix event counter availability check
To:     Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc:     linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
        Alexander Monakov <amonakov@ispras.ru>,
        Joerg Roedel <joro@8bytes.org>
References: <20200529200738.1923-1-amonakov@ispras.ru>
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 <dba1e37a-1ed7-ef7f-7252-2ebd1d6bde8c@amd.com>
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 <b01994db-da9b-d8e6-e0c1-1af35dd62191@amd.com>
 <alpine.LNX.2.20.13.2009172052480.29869@monopod.intra.ispras.ru>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <23d42e73-91ac-8f47-af64-40edff8bc027@molgen.mpg.de>
Date:   Sun, 21 Feb 2021 14:49:03 +0100
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Dear Suravee,


Am 17.09.20 um 19:55 schrieb Alexander Monakov:
> On Tue, 16 Jun 2020, Suravee Suthikulpanit wrote:
> 
>>>> 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:
>>> Hello. Can you give any update please?

[…]

>> Sorry for late reply. I have a reproducer and working with the HW team to
>> understand the issue.
>> I should be able to provide update with solution by the end of this week.
> 
> Hello, hope you are doing well. Has this investigation found anything?

I am wondering the same. It’d be great to have this fixed in the 
upstream Linux kernel.


Kind regards,

Paul