Hi Will,
On 12/09/14 17:34, Will Deacon wrote:
Hi all,
Here is version three of the RFC I've previously posted here:
RFCv1:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-August/283023.html
RFCv2:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/283752.html
Changes since RFCv2 include:
- Put the iommu_ops in iommu_data so of_iommu_configure can avoid using
the bus_type
- Initialise the offset and DMA masks on the dev in of_dma_configure
instead of in the arch callback (as this would cause a regression on
some architectures)
- Added deconfigure/teardown code based on ref counting the iommu_dma_mapping
- A bunch of small fixes (_OF_DECLARE, some code shuffling, fix multiple
IOMMU parsing)
All feedback welcome. Hopefully this is now at a point where people can
start looking to port dma-mapping and/or IOMMU drivers to it.
What about AMBA devices? Playing with this on Juno and wondering why my
PL330 doesn't get any of_xlate callbacks, I see that
of_amba_device_create doesn't call of_dma_configure or anything from
that path. It's easy to work around by removing the arm,primecell
compatible, but that feels pretty dirty.
Robin.
Cheers,
Will
--->8
Will Deacon (7):
iommu: provide early initialisation hook for IOMMU drivers
dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops
iommu: add new iommu_ops callback for adding an OF device
iommu: provide helper function to configure an IOMMU for an of master
dma-mapping: detect and configure IOMMU in of_dma_configure
arm: call iommu_init before of_platform_populate
arm: dma-mapping: plumb our iommu mapping ops into arch_setup_dma_ops
arch/arm/include/asm/dma-mapping.h | 9 ++--
arch/arm/kernel/setup.c | 2 +
arch/arm/mm/dma-mapping.c | 68 ++++++++++++++++++++++++++----
drivers/iommu/Kconfig | 2 +-
drivers/iommu/of_iommu.c | 84 ++++++++++++++++++++++++++++++++++++++
drivers/of/platform.c | 53 +++++++++++++-----------
include/asm-generic/vmlinux.lds.h | 2 +
include/linux/dma-mapping.h | 21 +++++++---
include/linux/iommu.h | 15 +++++++
include/linux/of_iommu.h | 35 ++++++++++++++++
10 files changed, 247 insertions(+), 44 deletions(-)
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