linux-kernel - Re: [PATCH v3 7/7] dmaengine/idxd: Re-enable kernel workqueue under DMA API

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Date:   Mon, 3 Apr 2023 14:56:49 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Yu, Fenghua" <fenghua.yu@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Will Deacon <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v3 7/7] dmaengine/idxd: Re-enable kernel workqueue under
 DMA API

Hi Fenghua,

On Fri, 31 Mar 2023 23:31:13 +0000, "Yu, Fenghua" <fenghua.yu@...el.com>
wrote:

> Hi, Jacob,
> 
> > Kernel workqueues were disabled due to flawed use of kernel VA and SVA
> > API. Now That we have the support for attaching PASID to the device's
> > default  
> 
> s/That/that/
will fix, for real this time :) you pointed it out before.

> > domain and the ability to reserve global PASIDs from SVA APIs, we can
> > re-enable the kernel work queues and use them under DMA API.
> > 
> > We also use non-privileged access for in-kernel DMA to be consistent
> > with the IOMMU settings. Consequently, interrupt for user privilege is
> > enabled for work completion IRQs.
> > 
> > Link:https://lore.kernel.org/linux-
> > iommu/20210511194726.GP1002214@...dia.com/
> > Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>  
> 
> Other than the typo,
> 
> Reviewed-by: Fenghua Yu <fenghua.yu@...el.com>
> 
> Thanks.
> 
> -Fenghua


Thanks,

Jacob