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iommu: Implement of_iommu_get_resv_regions()

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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.

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>
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>
This commit is contained in:
Thierry Reding
2023-01-20 18:42:50 +01:00
committed by Joerg Roedel
parent af0d81357c
commit a5bf3cfce8
2 changed files with 102 additions and 0 deletions
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8
include/linux/of_iommu.h
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@@ -12,6 +12,9 @@ extern const struct iommu_ops *of_iommu_configure(struct device *dev,
struct device_node *master_np,
const u32 *id);
extern void of_iommu_get_resv_regions(struct device *dev,
struct list_head *list);
#else
static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
@@ -21,6 +24,11 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
return NULL;
}
static inline void of_iommu_get_resv_regions(struct device *dev,
struct list_head *list)
{
}
#endif /* CONFIG_OF_IOMMU */
#endif /* __OF_IOMMU_H */