linux-kernel - Re: [PATCH v3 11/20] iommu/fsl_pamu: Add set_platform

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Message-ID: <Y4TCQysTwDqTv/Cz@nvidia.com>
Date:   Mon, 28 Nov 2022 10:14:27 -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 11/20] iommu/fsl_pamu: Add set_platform_dma callback

On Mon, Nov 28, 2022 at 02:46:39PM +0800, Lu Baolu wrote:
> This IOMMU driver doesn't support default domain. Add the implementation
> of set_platform_dma callback so that the IOMMU core could return the
> DMA control.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/fsl_pamu_domain.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
> index 4408ac3c49b6..b8c716e7c424 100644
> --- a/drivers/iommu/fsl_pamu_domain.c
> +++ b/drivers/iommu/fsl_pamu_domain.c
> @@ -314,6 +314,14 @@ static void fsl_pamu_detach_device(struct iommu_domain *domain,
>  		pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
>  }
>  
> +static void fsl_pamu_set_platform_dma(struct device *dev)
> +{
> +	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
> +
> +	if (domain)
> +		fsl_pamu_detach_device(domain, dev);
> +}

This is a bit ugly, it would be better to make the previous patch call
set_platform_dma if it is set instead of detach_dev and then these
patches should just rename the driver's fsl_pamu_detach_device to
fsl_pamu_set_platform_dma

Then the last patch just deletes the op and the core code

Jason