[PATCH 0/2] iommu: Support reserved-memory regions

[Thierry Reding]

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(+)

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2.22.0