linux-kernel - Re: [PATCH v3 01/20] iommu/amd: Remove detach

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Date:   Mon, 28 Nov 2022 09:42:06 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Rob Clark <robdclark@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/20] iommu/amd: Remove detach_dev callback

On Mon, Nov 28, 2022 at 02:46:29PM +0800, Lu Baolu wrote:
> The AMD IOMMU supports default domain, so the detach_dev op will never
> be called. Remove it to avoid dead code.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/amd/iommu.c | 26 --------------------------
>  1 file changed, 26 deletions(-)

Driver oweners should look at what their detach_dev does and comment
in this series - eg if this is actually blocking DMA then it would be
great to convert it into a blocking domain.

But there is no issue with deleting it, and the blocking domain is an
optimization.

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason