netdev - [RFC PATCH 2/3] iommu/dma: wire-up new dma op dma_addr_to_phys

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Message-ID: <20191022125502.12495-3-laurentiu.tudor@nxp.com>
Date:   Tue, 22 Oct 2019 12:55:16 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     "hch@....de" <hch@....de>, "joro@...tes.org" <joro@...tes.org>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ioana Ciornei <ioana.ciornei@....com>
CC:     Leo Li <leoyang.li@....com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Madalin-cristian Bucur <madalin.bucur@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [RFC PATCH 2/3] iommu/dma: wire-up new dma op dma_addr_to_phys_addr()

From: Laurentiu Tudor <laurentiu.tudor@....com>

Add an implementation of the newly introduced dma map op in the
generic DMA IOMMU generic glue layer and wire it up.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---
 drivers/iommu/dma-iommu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index f321279baf9e..0d2856793ecd 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1091,6 +1091,17 @@ static unsigned long iommu_dma_get_merge_boundary(struct device *dev)
 	return (1UL << __ffs(domain->pgsize_bitmap)) - 1;
 }
 
+static phys_addr_t iommu_dma_dma_addr_to_phys_addr(struct device *dev,
+						   dma_addr_t dma_handle)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+	if (domain)
+		return iommu_iova_to_phys(domain, dma_handle);
+
+	return 0;
+}
+
 static const struct dma_map_ops iommu_dma_ops = {
 	.alloc			= iommu_dma_alloc,
 	.free			= iommu_dma_free,
@@ -1107,6 +1118,7 @@ static const struct dma_map_ops iommu_dma_ops = {
 	.map_resource		= iommu_dma_map_resource,
 	.unmap_resource		= iommu_dma_unmap_resource,
 	.get_merge_boundary	= iommu_dma_get_merge_boundary,
+	.dma_addr_to_phys_addr	= iommu_dma_dma_addr_to_phys_addr,
 };
 
 /*
-- 
2.17.1