From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thierry Reding Subject: [PATCH 0/2] iommu: Support reserved-memory regions Date: Thu, 29 Aug 2019 13:14:05 +0200 Message-ID: <20190829111407.17191-1-thierry.reding@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Joerg Roedel Cc: Rob Herring , Frank Rowand , Will Deacon , Robin Murphy , iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org From: Thierry Reding 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