From: Thierry Reding <thierry.reding@gmail.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: devicetree@vger.kernel.org, Frank Rowand <frowand.list@gmail.com>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Rob Herring <robh+dt@kernel.org>, Will Deacon <will@kernel.org>
Subject: [PATCH 0/2] iommu: Support reserved-memory regions
Date: Thu, 29 Aug 2019 13:14:05 +0200 [thread overview]
Message-ID: <20190829111407.17191-1-thierry.reding@gmail.com> (raw)
From: Thierry Reding <treding@nvidia.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
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next reply other threads:[~2019-08-29 11:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 11:14 Thierry Reding [this message]
2019-08-29 11:14 ` [PATCH 1/2] iommu: Implement of_iommu_get_resv_regions() Thierry Reding
2019-09-02 13:38 ` Rob Herring
2019-09-02 13:54 ` Robin Murphy
2019-09-02 15:00 ` Thierry Reding
2019-09-09 14:04 ` Will Deacon
2019-08-29 11:14 ` [PATCH 2/2] iommu: dma: Use of_iommu_get_resv_regions() Thierry Reding
2019-09-02 14:22 ` Robin Murphy
2019-09-02 14:52 ` Thierry Reding
2019-09-17 17:59 ` Will Deacon
2019-11-27 12:16 ` Thierry Reding
2019-11-27 14:16 ` Thierry Reding
2019-11-27 17:09 ` Robin Murphy
2019-11-28 11:43 ` Thierry Reding
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