[PATCH 00/10] Add support for Renesas R-Car S4 IPMMU and other misc changes

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

The R-Car S4 is an automotive System-on-Chip (SoC) for Car Server/Communication
Gateway and is one of the first products in Renesas’ 4th-generation R-Car 
Family.

The integrated IOMMU HW is also VMSA-compatible and supports stage 2 translation
table format, therefore can be used with current R-Car Gen3 driver with slight
modifications.

In the context of Xen driver the main differences between Gen3 and S4 are
the following:
 - HW capacity was enlarged to support up to 16 IPMMU contexts (sets of page 
table)
   and up to 64 micro-TLBs per IPMMU device
 - the memory mapped registers have different bases and offset

The first part (commits #1-6) is a non-verbatim port of Linux upstream commits
needed to add support for S4 series easily (prereq work).
The second part (commits #7-8) is based on the code from the Renesas BSP and
actually introduces support for R-Car S4 IPMMU.
The third part (commits #9-10) is misc changes I have locally.

The patch series is based on 4.16.0-rc4 branch and also available at [1].

Tested on Renesas Salvator-X board with H3 ES3.0 SoC (Gen3) and Renesas Spider
board with S4 SoC.

[1] https://github.com/otyshchenko1/xen/commits/s4_ipmmu_ml1

Oleksandr Tyshchenko (10):
  iommu/ipmmu-vmsa: Remove all unused register definitions
  iommu/ipmmu-vmsa: Add helper functions for MMU "context" registers
  iommu/ipmmu-vmsa: Add helper functions for "uTLB" registers
  iommu/ipmmu-vmsa: Add light version of Linux's ipmmu_features
  iommu/ipmmu-vmsa: Calculate context registers' offset instead of a
    macro
  iommu/ipmmu-vmsa: Add utlb_offset_base
  iommu/ipmmu-vmsa: Add Renesas R8A779F0 (R-Car S4) support
  iommu/ipmmu-vmsa: Set IPMMU bit IMSCTLR_USE_SECGRP to 0
  iommu/ipmmu-vmsa: Use refcount for the micro-TLBs
  iommu/arm: Remove code duplication in all IOMMU drivers

 xen/drivers/passthrough/Kconfig          |   6 +-
 xen/drivers/passthrough/arm/iommu.c      |   7 +
 xen/drivers/passthrough/arm/ipmmu-vmsa.c | 278 +++++++++++++++++++------------
 xen/drivers/passthrough/arm/smmu-v3.c    |  10 --
 xen/drivers/passthrough/arm/smmu.c       |  10 --
 5 files changed, 178 insertions(+), 133 deletions(-)

-- 
2.7.4