linux-kernel - [PATCH v2 7/8] iommu: Export iommu_get_dma

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Date:   Mon, 27 Mar 2023 16:21:37 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Jason Gunthorpe <jgg@...dia.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, dmaengine@...r.kernel.org,
        vkoul@...nel.org
Cc:     "Robin Murphy" <robin.murphy@....com>,
        "Will Deacon" <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v2 7/8] iommu: Export iommu_get_dma_domain

Devices that use ENQCMDS to submit work needs to retrieve its DMA
domain. It can then attach PASID to the DMA domain for shared mapping
(with RID) established by DMA API.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/iommu.c | 1 +
 include/linux/iommu.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 10db680acaed..c51d343a75d2 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2118,6 +2118,7 @@ struct iommu_domain *iommu_get_dma_domain(struct device *dev)
 {
 	return dev->iommu_group->default_domain;
 }
+EXPORT_SYMBOL_GPL(iommu_get_dma_domain);
 
 /*
  * IOMMU groups are really the natural working unit of the IOMMU, but
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0471089dc1d0..1ef9a1109534 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -1089,6 +1089,11 @@ iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
 {
 	return NULL;
 }
+
+static inline struct iommu_domain *iommu_get_dma_domain(struct device *dev)
+{
+	return NULL;
+}
 #endif /* CONFIG_IOMMU_API */
 
 /**
-- 
2.25.1