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

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Date:   Thu, 29 Aug 2019 13:14:05 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] iommu: Support reserved-memory regions

From: Thierry Reding <treding@...dia.com>

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