linux-kernel - Re: [PATCH v3 1/6] dmaengine: idxd: Add enable/disable device IOPF feature

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Date:   Mon, 3 Apr 2023 09:57:33 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>, iommu@...ts.linux.dev,
        dmaengine@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] dmaengine: idxd: Add enable/disable device IOPF
 feature



On 4/2/23 10:49 PM, Baolu Lu wrote:
> On 3/24/23 8:02 PM, Lu Baolu wrote:
>> The iommu subsystem requires IOMMU_DEV_FEAT_IOPF must be enabled before
>> and disabled after IOMMU_DEV_FEAT_SVA, if device's I/O page faults rely
>> on the IOMMU. Add explicit IOMMU_DEV_FEAT_IOPF enabling/disabling in this
>> driver.
>>
>> At present, missing IOPF enabling/disabling doesn't cause any real issue,
>> because the IOMMU driver places the IOPF enabling/disabling in the path
>> of SVA feature handling. But this may change.
>>
>> Reviewed-by: Dave Jiang<dave.jiang@...el.com>
>> Reviewed-by: Fenghua Yu<fenghua.yu@...el.com>
>> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
>> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> 
> Hi Dave and Fenghua,
> 
> The following iommu patches depends on this one. Can I route it to
> Linus through the iommu tree?

Hi Baolu, you'll need an ack from Vinod, who is the dmaengine subsystem 
maintainer. I have no objections.


> 
> Best regards,
> baolu