linux-kernel - [PATCH v3 0/8] dmaengine: rcar-dmac: add iommu support for slave transfers

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Message-Id: <1455065878-11906-1-git-send-email-niklas.soderlund+renesas@ragnatech.se>
Date:	Wed, 10 Feb 2016 01:57:50 +0100
From:	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
To:	linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:	robin.murphy@....com, vinod.koul@...el.com,
	laurent.pinchart@...asonboard.com, geert+renesas@...der.be,
	linus.walleij@...aro.org, dan.j.williams@...el.com, arnd@...db.de,
	linux-arch@...r.kernel.org,
	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
Subject: [PATCH v3 0/8] dmaengine: rcar-dmac: add iommu support for slave transfers

Hi,

This series add iommu support to rcar-dmac. It's tested on koelsch with
CONFIG_IPMMU_VMSA and by enabling the ipmmu_ds node in r8a7791.dtsi. I
verified operation by interacting with /dev/mmcblk1  which is a device
behind the iommu.

The series depends on out of tree patch '[PATCH] dmaengine: use
phys_addr_t for slave configuration' which currently is under review.

* Changes since v2
- Drop patch to add dma_{map,unmap}_page_attrs.
- Add dma_{map,unmap}_resource to handle the mapping without involving a
  'struct page'. Thanks Laurent and Robin for pointing this out.
- Use size instead of address to keep track of if a mapping exist or not
  since addr == 0 is valid. Thanks Laurent.
- Pick up patch from Robin with Laurents ack (hope it's OK for me to
  attach the ack?) to add IOMMU_MMIO.
- Fix bug in rcar_dmac_device_config where the error check where
  inverted.
- Use DMA_BIDIRECTIONAL in rcar_dmac_device_config since we at that
  point can't be sure what direction the mapping is going to be used.

* Changes since v1
- Add and use a dma_{map,unmap}_page_attrs to be able to map the page
  using attributes DMA_ATTR_NO_KERNEL_MAPPING and
  DMA_ATTR_SKIP_CPU_SYNC. Thanks Laurent.
- Drop check if dmac is part of a iommu group or not, let the DMA
  mapping api handle it.
- Move slave configuration data around in rcar-dmac to avoid code
  duplication.
- Fix build issue reported by 'kbuild test robot' regarding phys_to_page
  not availability on some configurations.
- Add DT information for r8a7791.

* Changes since RFC
- Switch to use the dma-mapping api instead of using the iommu_map()
  directly. Turns out the dma-mapper is much smarter then me...
- Dropped the patch to expose domain->ops->pgsize_bitmap from within the
  iommu api.
- Dropped the patch showing how I tested the RFC.

Niklas Söderlund (7):
  dma-mapping: add {map,unmap}_resource to dma_map_ops
  dma-mapping: add dma_{map,unmap}_resource
  arm: dma-mapping: add {map,unmap}_resource for iommu ops
  dmaengine: rcar-dmac: group slave configuration
  dmaengine: rcar-dmac: add iommu support for slave transfers
  ARM: dts: r8a7790: add iommus to dmac0 and dmac1
  ARM: dts: r8a7791: add iommus to dmac0 and dmac1

Robin Murphy (1):
  iommu: Add MMIO mapping type

 arch/arm/boot/dts/r8a7790.dtsi | 30 +++++++++++++++
 arch/arm/boot/dts/r8a7791.dtsi | 30 +++++++++++++++
 arch/arm/mm/dma-mapping.c      | 63 +++++++++++++++++++++++++++++++
 drivers/dma/sh/rcar-dmac.c     | 86 +++++++++++++++++++++++++++++++++---------
 drivers/iommu/io-pgtable-arm.c |  4 +-
 include/linux/dma-mapping.h    | 33 ++++++++++++++++
 include/linux/iommu.h          |  1 +
 7 files changed, 229 insertions(+), 18 deletions(-)

--
2.7.1