From: Thierry Reding <treding@xxxxxxxxxx> These two patches implement support for retrieving a list of reserved regions for a device from its device tree node. These regions are described by the reserved-memory bindings: Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt These reserved memory regions will be used to establish 1:1 mappings. One case where this is useful is when the Linux kernel wants to take over the display controller configuration from a bootloader. In order to ensure that the display controller can keep scanning out from the framebuffer allocated by the bootloader without faulting after the IOMMU has been enabled, a 1:1 mapping needs to be established. Thierry Thierry Reding (2): iommu: Implement of_iommu_get_resv_regions() iommu: dma: Use of_iommu_get_resv_regions() drivers/iommu/dma-iommu.c | 3 +++ drivers/iommu/of_iommu.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/of_iommu.h | 8 ++++++++ 3 files changed, 50 insertions(+) -- 2.22.0
