iommu: Implement of_iommu_get_resv_regions()
authorThierry Reding <treding@nvidia.com>
Fri, 20 Jan 2023 17:42:50 +0000 (18:42 +0100)
committerJoerg Roedel <jroedel@suse.de>
Wed, 25 Jan 2023 10:48:28 +0000 (11:48 +0100)
commita5bf3cfce8cb77d9d24613ab52d520896f83dd48
tree538a32161b122b9d8dbf23704c57599c505307da
parentaf0d81357cc558ff40968b4e04131e08ae540127
iommu: Implement of_iommu_get_resv_regions()

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>
drivers/iommu/of_iommu.c
include/linux/of_iommu.h