linux-kernel - Re: [PATCH 4/4] dmaengine: idxd: Use DMA API for in-kernel DMA with PASID

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Date:   Wed, 8 Dec 2021 10:26:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Raj Ashok <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        Tony Luck <tony.luck@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Barry Song <21cnbao@...il.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Subject: Re: [PATCH 4/4] dmaengine: idxd: Use DMA API for in-kernel DMA with
 PASID

On 07-12-21, 16:27, Dave Jiang wrote:
> 
> On 12/7/2021 6:47 AM, Jacob Pan wrote:
> > In-kernel DMA should be managed by DMA mapping API. The existing kernel
> > PASID support is based on the SVA machinery in SVA lib that is intended
> > for user process SVA. The binding between a kernel PASID and kernel
> > mapping has many flaws. See discussions in the link below.
> > 
> > This patch utilizes iommu_enable_pasid_dma() to enable DSA to perform DMA
> > requests with PASID under the same mapping managed by DMA mapping API.
> > In addition, SVA-related bits for kernel DMA are removed. As a result,
> > DSA users shall use DMA mapping API to obtain DMA handles instead of
> > using kernel virtual addresses.
> > 
> > Link: https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> 
> Acked-by: Dave Jiang <dave.jiang@...el.com>
> 
> Also cc Vinod and dmaengine@...r

Pls resend collecting acks. I dont have this in my queue

-- 
~Vinod