From: Thierry Reding <treding@xxxxxxxxxx>
The dma_iommu_detach_device() API can be used by drivers to forcibly
detach a device from an IOMMU that architecture code might have attached
to. This is useful for drivers that need explicit control over the IOMMU
using the IOMMU API directly.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/base/dma-mapping.c | 8 ++++++++
include/linux/dma-mapping.h | 2 ++
2 files changed, 10 insertions(+)
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index d82566d6e237..18ddf32b10c9 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -366,3 +366,11 @@ void dma_deconfigure(struct device *dev)
of_dma_deconfigure(dev);
acpi_dma_deconfigure(dev);
}
+
+void dma_iommu_detach_device(struct device *dev)
+{
+#ifdef arch_iommu_detach_device
+ arch_iommu_detach_device(dev);
+#endif
+}
+EXPORT_SYMBOL(dma_iommu_detach_device);
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index f8ab1c0f589e..732191a2c64e 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -671,6 +671,8 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
static inline void arch_teardown_dma_ops(struct device *dev) { }
#endif
+extern void dma_iommu_detach_device(struct device *dev);
+
static inline unsigned int dma_get_max_seg_size(struct device *dev)
{
if (dev->dma_parms && dev->dma_parms->max_segment_size)
--
2.17.0
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