693c712967
This is an implementation that IOMMU drivers can use to obtain reserved memory regions from a device tree node. It uses the reserved-memory DT bindings to find the regions associated with a given device. If these regions are marked accordingly, identity mappings will be created for them in the IOMMU domain that the devices will be attached to. Bug: 257546262 Cc: Frank Rowand <frowand.list@gmail.com> Cc: devicetree@vger.kernel.org Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Robin Murphy <robin.murphy@arm.com> Change-Id: I68367e556cfd822a5802d7ff579f6dc12f54f6a6 Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20230120174251.4004100-4-thierry.reding@gmail.com Signed-off-by: Joerg Roedel <jroedel@suse.de> (cherry picked from commit a5bf3cfce8cb77d9d24613ab52d520896f83dd48)
35 lines
703 B
C
35 lines
703 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __OF_IOMMU_H
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#define __OF_IOMMU_H
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struct device;
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struct device_node;
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struct iommu_ops;
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#ifdef CONFIG_OF_IOMMU
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extern const struct iommu_ops *of_iommu_configure(struct device *dev,
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struct device_node *master_np,
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const u32 *id);
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extern void of_iommu_get_resv_regions(struct device *dev,
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struct list_head *list);
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#else
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static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
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struct device_node *master_np,
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const u32 *id)
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{
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return NULL;
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}
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static inline void of_iommu_get_resv_regions(struct device *dev,
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struct list_head *list)
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{
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}
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#endif /* CONFIG_OF_IOMMU */
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#endif /* __OF_IOMMU_H */
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