linux-kernel - Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

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Message-ID: <6e5079d1-1bdb-1b36-3884-0112f2557271@linux.intel.com>
Date:   Thu, 19 May 2022 14:50:42 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>, dmaengine@...r.kernel.org,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>, vkoul@...nel.org,
        robin.murphy@....com, will@...nel.org
Cc:     baolu.lu@...ux.intel.com, Yi Liu <yi.l.liu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

On 2022/5/19 02:21, Jacob Pan wrote:
> DMA requests tagged with PASID can target individual IOMMU domains.
> Introduce a domain-wide PASID for DMA API, it will be used on the same
> mapping as legacy DMA without PASID. Let it be IOVA or PA in case of
> identity domain.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>   include/linux/iommu.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 9405034e3013..36ad007084cc 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -106,6 +106,8 @@ struct iommu_domain {
>   	enum iommu_page_response_code (*iopf_handler)(struct iommu_fault *fault,
>   						      void *data);
>   	void *fault_data;
> +	ioasid_t dma_pasid;		/* Used for DMA requests with PASID */

This looks more suitable for iommu_dma_cookie?

> +	atomic_t dma_pasid_users;
>   };
>   
>   static inline bool iommu_is_dma_domain(struct iommu_domain *domain)

Best regards,
baolu