From: robin.murphy@arm•com (Robin Murphy)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v6 0/3] arm64: IOMMU-backed DMA mapping
Date: Thu, 1 Oct 2015 20:13:57 +0100 [thread overview]
Message-ID: <cover.1443718557.git.robin.murphy@arm.com> (raw)
Hi all,
Here's the latest, and hopefully last, revision of the initial arm64
IOMMU dma_ops support.
There are a couple of dependencies still currently in -next and the
intel-iommu tree[0]: "iommu: iova: Move iova cache management to the
iova library" is necessary for the rename of iova_cache_get(), and
"iommu/iova: Avoid over-allocating when size-aligned" will be needed
with some IOMMU drivers to prevent unmapping errors.
Changes from v5[1]:
- Change __iommu_dma_unmap() from BUG to WARN when things go wrong, and
prevent a NULL dereference on double-free.
- Fix iommu_dma_map_sg() to ensure segments can never inadvertently end
mapped across a segment boundary. As a result, we have to lose the
segment-merging optimisation from before (I might revisit that if
there's some evidence it's really worthwhile, though).
- Cleaned up the platform device workarounds for config order and
default domains, and removed the other hacks. Demanding that the IOMMU
drivers assign groups, and support IOMMU_DOMAIN_DMA via the methods
provided, keeps things bearable, and the behaviour should now be
consistent across all cases.
As a bonus, whilst the underlying of_iommu_configure() code only supports
platform devices at the moment, I can also say that this has now been
tested to work for PCI devices too, via some horrible hacks on a Juno r1.
Thanks,
Robin.
[0]:http://thread.gmane.org/gmane.linux.kernel.iommu/11033
[1]:http://thread.gmane.org/gmane.linux.kernel.iommu/10439
Robin Murphy (3):
iommu: Implement common IOMMU ops for DMA mapping
arm64: Add IOMMU dma_ops
arm64: Hook up IOMMU dma_ops
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/dma-mapping.h | 15 +-
arch/arm64/mm/dma-mapping.c | 457 ++++++++++++++++++++++++++++++
drivers/iommu/Kconfig | 7 +
drivers/iommu/Makefile | 1 +
drivers/iommu/dma-iommu.c | 524 +++++++++++++++++++++++++++++++++++
include/linux/dma-iommu.h | 85 ++++++
include/linux/iommu.h | 1 +
8 files changed, 1083 insertions(+), 8 deletions(-)
create mode 100644 drivers/iommu/dma-iommu.c
create mode 100644 include/linux/dma-iommu.h
--
1.9.1
next reply other threads:[~2015-10-01 19:13 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-01 19:13 Robin Murphy [this message]
2015-10-01 19:13 ` [PATCH v6 1/3] iommu: Implement common IOMMU ops for DMA mapping Robin Murphy
2015-10-26 13:44 ` Yong Wu
2015-10-26 16:55 ` Robin Murphy
2015-10-30 1:17 ` Daniel Kurtz
2015-10-30 14:09 ` Joerg Roedel
2015-10-30 14:27 ` Robin Murphy
2015-11-02 13:11 ` Daniel Kurtz
2015-11-02 13:43 ` Tomasz Figa
2015-11-03 17:41 ` Robin Murphy
2015-11-03 18:40 ` Russell King - ARM Linux
2015-11-04 5:15 ` Tomasz Figa
2015-11-04 9:10 ` Russell King - ARM Linux
2015-11-04 5:12 ` Tomasz Figa
2015-11-04 9:27 ` Russell King - ARM Linux
2015-11-04 9:48 ` Tomasz Figa
2015-11-04 10:50 ` Russell King - ARM Linux
2015-11-09 13:11 ` Robin Murphy
2015-11-17 12:02 ` Marek Szyprowski
2015-10-01 19:13 ` [PATCH v6 2/3] arm64: Add IOMMU dma_ops Robin Murphy
2015-10-06 11:00 ` Yong Wu
2015-10-07 16:07 ` Robin Murphy
2015-10-09 5:44 ` Yong Wu
2015-10-07 9:03 ` Anup Patel
2015-10-07 16:36 ` Robin Murphy
2015-10-07 17:40 ` Anup Patel
2015-10-14 11:47 ` Joerg Roedel
2015-10-14 13:35 ` Catalin Marinas
2015-10-14 16:34 ` Robin Murphy
2015-11-04 8:39 ` Yong Wu
2015-11-04 13:11 ` Robin Murphy
2015-11-04 17:35 ` Laura Abbott
2015-10-01 19:14 ` [PATCH v6 3/3] arm64: Hook up " Robin Murphy
2015-10-13 12:12 ` [PATCH v6 0/3] arm64: IOMMU-backed DMA mapping Robin Murphy
2015-10-14 11:50 ` joro at 8bytes.org
2015-10-14 18:19 ` Robin Murphy
2015-10-15 15:04 ` Joerg Roedel
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