[PATCH 06/18] ARM/dma-mapping: Support IOMMU default domains
From: Robin Murphy <robin.murphy@arm.com>
Date: 2020-08-20 15:12:34
Also in:
dri-devel, linux-arm-msm, linux-iommu, linux-media, linux-mediatek, linux-samsung-soc, linux-tegra, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Now that iommu-dma is wired up, we can let it work as normal without the dma_iommu_mapping hacks if the IOMMU driver already supports default domains. Signed-off-by: Robin Murphy <robin.murphy@arm.com> --- arch/arm/mm/dma-mapping.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 0f69ede44cd7..2ef0afc17645 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c@@ -1220,6 +1220,13 @@ static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size, if (!iommu) return false; + /* If a default domain exists, just let iommu-dma work normally */ + if (iommu_get_domain_for_dev(dev)) { + iommu_setup_dma_ops(dev, dma_base, size); + return true; + } + + /* Otherwise, use the workaround until the IOMMU driver is updated */ mapping = arm_iommu_create_mapping(dev->bus, dma_base, size); if (IS_ERR(mapping)) { pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
@@ -1234,6 +1241,7 @@ static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size, return false; } + set_dma_ops(dev, &iommu_dma_ops); return true; }
@@ -1263,8 +1271,6 @@ static void arm_teardown_iommu_dma_ops(struct device *dev) { } void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, const struct iommu_ops *iommu, bool coherent) { - const struct dma_map_ops *dma_ops; - dev->archdata.dma_coherent = coherent; #ifdef CONFIG_SWIOTLB dev->dma_coherent = coherent;
@@ -1278,12 +1284,9 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, if (dev->dma_ops) return; - if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu)) - dma_ops = &iommu_dma_ops; - else - dma_ops = arm_get_dma_map_ops(coherent); + set_dma_ops(dev, arm_get_dma_map_ops(coherent)); - set_dma_ops(dev, dma_ops); + arm_setup_iommu_dma_ops(dev, dma_base, size, iommu); #ifdef CONFIG_XEN if (xen_initial_domain())
--
2.28.0.dirty
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