linux-kernel - Re: [PATCH v4 10/19] iommu: Add set_platform_dma

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Date:   Wed, 4 Jan 2023 09:17:33 -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 v4 10/19] iommu: Add set_platform_dma_ops iommu ops

On Wed, Jan 04, 2023 at 08:57:16PM +0800, Lu Baolu wrote:

> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index de91dd88705b..4e35a9f94873 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -2163,6 +2163,17 @@ static int iommu_group_do_detach_device(struct device *dev, void *data)
>  	return 0;
>  }
>  
> +static int iommu_group_do_set_platform_dma(struct device *dev, void *data)
> +{
> +	const struct iommu_ops *ops = dev_iommu_ops(dev);
> +
> +	if (!ops->set_platform_dma_ops)
> +		return -EINVAL;
> +
> +	ops->set_platform_dma_ops(dev);
> +	return 0;
> +}
> +
>  static int __iommu_group_set_domain(struct iommu_group *group,
>  				    struct iommu_domain *new_domain)
>  {
> @@ -2177,10 +2188,14 @@ static int __iommu_group_set_domain(struct iommu_group *group,
>  	 * platform specific behavior.
>  	 */
>  	if (!new_domain) {
> -		if (WARN_ON(!group->domain->ops->detach_dev))
> -			return -EINVAL;

This should still have the WARN_ON..

if (WARN_ON(!group->domain->ops->detach_dev && !dev_iommu_ops(dev)->set_platform_dma_ops)

Jason