[Resend][pull request][SRU][Zesty] Support SMMU passthrough using the default domain

[Manoj Iyer]

Paolo found build issues with the patch series I had sent earlier and 
nak'ed it because of build failure. Rather than sending large number of 
patches with git send-email I am resending these as a pull-request (I 
should have done this initially).

I am resending the patch series to add  support for SMMU passthrough 
using the default domain, the patch series implements a kernel 
command-line option iommu.passthrough=0/1 1 - Bypass the IOMMU for DMA, 
0 - Use IOMMU translation for DMA. This feature  is desired on both 
Qualcomm Centriq 2400 and Thunder-X platforms.

The bug report http://bugs.launchpad.net/bugs/1688158 has detailed test 
results from Qualcomm demonstrating performance improvements using 
passthrough. I  have  also tested the kernel on Thundex-X for any 
regressions, for both boot test and  pci passthrough.

I builtsuccessfully the kernel in the centriq ppa with patches applied 
to zesty master for ARM64, AMD64 and i386.
https://launchpad.net/~centriq-team/+archive/ubuntu/sru/+packages

Please consider this patch series for review and SRU to zesty.

The following changes since commit 
6e2b676684d740b6c781cf631453127f3f4d7631:

  UBUNTU: Ubuntu-4.10.0-21.23 (2017-04-28 12:46:22 +0200)

are available in the git repository at:

  git+ssh://git.launchpad.net/~centriq-team/+git/linux-sru lp1688158

for you to fetch changes up to ac9d3fd2c6f4a7d7bd0d3329ac073eca1961f8e5:

  arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA 
(2017-05-19 14:40:57 -0500)

----------------------------------------------------------------
Joerg Roedel (7):
      iommu: Rename iommu_get_instance()
      iommu: Rename struct iommu_device
      iommu: Introduce new 'struct iommu_device'
      iommu: Add sysfs bindings for struct iommu_device
      iommu: Make iommu_device_link/unlink take a struct iommu_device
      iommu: Add iommu_device_set_fwnode() interface
      iommu/arm-smmu: Make use of the iommu_register interface

Will Deacon (6):
      iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains
      iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY 
domains
      iommu/arm-smmu-v3: Make arm_smmu_install_ste_for_dev return void
      iommu/arm-smmu-v3: Install bypass STEs for IOMMU_DOMAIN_IDENTITY 
domains
      iommu: Allow default domain type to be set on the kernel command 
line
      arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA

 Documentation/admin-guide/kernel-parameters.txt |  6 ++
 arch/arm64/mm/dma-mapping.c                     | 17 +++--
 drivers/acpi/arm64/iort.c                       |  2 +-
 drivers/iommu/amd_iommu.c                       | 18 +++--
 drivers/iommu/amd_iommu_init.c                  |  9 ++-
 drivers/iommu/amd_iommu_types.h                 |  4 +-
 drivers/iommu/arm-smmu-v3.c                     | 98 
+++++++++++++++++--------
 drivers/iommu/arm-smmu.c                        | 56 +++++++++++++-
 drivers/iommu/dmar.c                            | 20 +++--
 drivers/iommu/intel-iommu.c                     | 21 +++---
 drivers/iommu/iommu-sysfs.c                     | 61 +++++++--------
 drivers/iommu/iommu.c                           | 61 ++++++++++++---
 include/linux/intel-iommu.h                     |  3 +-
 include/linux/iommu.h                           | 78 
++++++++++++++++----
 include/linux/of_iommu.h                        |  2 +-
 15 files changed, 327 insertions(+), 129 deletions(-)


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