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

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