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

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Message-ID: <IA1PR11MB609783D2D1159E4AA6F6099E9B8F9@IA1PR11MB6097.namprd11.prod.outlook.com>
Date:   Fri, 31 Mar 2023 23:31:13 +0000
From:   "Yu, Fenghua" <fenghua.yu@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        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>
CC:     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>
Subject: RE: [PATCH v3 7/7] dmaengine/idxd: Re-enable kernel workqueue under
 DMA API

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/

> 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