linux-kernel - Re: [RESEND v2] iommu/vt-d: Use passthrough mode for the Intel IPUs

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Message-ID: <c9a0fc75-8b7b-e0ae-572e-8ca030a04537@linux.intel.com>
Date:   Tue, 20 Apr 2021 18:34:26 +0800
From:   Bingbu Cao <bingbu.cao@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        will@...nel.org, bhelgaas@...gle.com, rajatja@...gle.com,
        grundler@...omium.org, tfiga@...omium.org,
        senozhatsky@...omium.org, sakari.ailus@...ux.intel.com
Subject: Re: [RESEND v2] iommu/vt-d: Use passthrough mode for the Intel IPUs

Andy,

On 4/20/21 6:20 PM, Andy Shevchenko wrote:
> On Tue, Apr 20, 2021 at 10:48:33AM +0800, Bingbu Cao wrote:
>> Intel IPU(Image Processing Unit) has its own (IO)MMU hardware,
>> The IPU driver allocates its own page table that is not mapped
>> via the DMA, and thus the Intel IOMMU driver blocks access giving
>> this error:
>>
>> DMAR: DRHD: handling fault status reg 3
>> DMAR: [DMA Read] Request device [00:05.0] PASID ffffffff
>>       fault addr 76406000 [fault reason 06] PTE Read access is not set
>>
>> As IPU is not an external facing device which is not risky, so use
>> IOMMU passthrough mode for Intel IPUs.
>>
>> Fixes: 26f5689592e2 ("media: staging/intel-ipu3: mmu: Implement driver")
>> Signed-off-by: Bingbu Cao <bingbu.cao@...el.com>
>> ---
>>  drivers/iommu/intel/iommu.c | 29 +++++++++++++++++++++++++++++
> 
> This misses the changelog from v1 followed by the explanation why resent.
> 
I noticed there was a typo in the recipient list:
stable.vger.kernel.org -> stable@...r.kernel.org

no code change for resent.

-- 
Best regards,
Bingbu Cao