linux-kernel - Re: [PATCH v9 0/7] Re-enable IDXD kernel workqueue under DMA API

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Date:   Tue, 11 Jul 2023 10:29:10 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Jason Gunthorpe <jgg@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        dmaengine@...r.kernel.org, vkoul@...nel.org
Cc:     baolu.lu@...ux.intel.com, Will Deacon <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>, rex.zhang@...el.com,
        xiaochen.shen@...el.com, narayan.ranganathan@...el.com
Subject: Re: [PATCH v9 0/7] Re-enable IDXD kernel workqueue under DMA API

On 2023/7/11 1:18, Jacob Pan wrote:
> Hi Baolu, Joerg, and all,

Hi Jacob,

> 
> Just wondering if there are more comments?
> 
> Thanks,
> 
> Jacob
> 
> On Wed, 21 Jun 2023 13:59:40 -0700, Jacob Pan
> <jacob.jun.pan@...ux.intel.com>  wrote:
> 
>> Hi Joerg and all,
>>
>> IDXD kernel work queues were disabled due to the flawed use of kernel VA
>> and SVA API.
>> Link:
>> https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/
>>
>> The solution is to enable it under DMA API where IDXD shared workqueue
>> users can use ENQCMDS to submit work on buffers mapped by DMA API.
>>
>> This patchset adds support for attaching PASID to the device's default
>> domain and the ability to allocate global PASIDs from IOMMU APIs. IDXD
>> driver can then re-enable the kernel work queues and use them under DMA
>> API.
>>
>> This depends on the IOASID removal series. (merged)
>> https://lore.kernel.org/all/ZCaUBJvUMsJyD7EW@8bytes.org/
>>
>>
>> Thanks,
>>
>> Jacob
>>
>> ---
>> Changelog:
>> v9:
>> 	- Fix an IDXD driver issue where user interrupt enable bit got
>> cleared during device enable/disable cycle. Reported and tested by
>> 	  Tony Zhu<tony.zhu@...el.com>
>> 	- Rebased to v6.4-rc7

Thanks for fixing this.

It seems that you missed some review comments for v8. I can help to test
and merge when all comments are addressed.

Best regards,
baolu