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

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Message-Id: <20220518182120.1136715-2-jacob.jun.pan@linux.intel.com>
Date:   Wed, 18 May 2022 11:21:15 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     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>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Christoph Hellwig" <hch@...radead.org>, vkoul@...nel.org,
        robin.murphy@....com, will@...nel.org
Cc:     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>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

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 */
+	atomic_t dma_pasid_users;
 };
 
 static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
-- 
2.25.1