[GIT PULL] iommu/arm-smmu: Big batch of updates for 5.4

[Will Deacon <will@kernel.org>]

Hi Joerg,

Please pull these ARM SMMU updates for 5.4. The branch is based on the
for-joerg/batched-unmap branch that you pulled into iommu/core already
because I didn't want to rebase everything onto -rc3. The pull request
was generated against iommu/core.

There's a lot of code here, but the headlines are:

  * Complete refactoring of arm-smmu.c to allow for implementation-specific
    quirks, errata and general weirdness outside of the core architecture
    support code.

  * Rework of the SMMUv3 ATS support, after it was found to be broken.
    Since it's a pretty niche thing for us right now, the support is
    effectively reverted for -stable kernels.

  * New algorithm for submitting commands to the SMMUv3 command queue
    which removes the need for a spinlock and reduces CPU usage under
    heavy I/O loads.

There's some ongoing work to extend io-pgtable to be able to deal with
high virtual address ranges but that's not quite there yet and I hope
to queue it for 5.5 instead.

Any problems, just shout (although it's a public holiday on Monday in
the UK, so you'll have to shout very loudly indeed).

Cheers,

Will

--->8

The following changes since commit 3951c41af4a65ba418e6b1b973d398552bedb84f:

  iommu/io-pgtable: Pass struct iommu_iotlb_gather to ->tlb_add_page() (2019-07-29 17:22:59 +0100)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git for-joerg/arm-smmu/updates

for you to fetch changes up to 1554240ff864da9eb99e2233d3faf191c567c47a:

  Merge branches 'for-joerg/arm-smmu/smmu-v2' and 'for-joerg/arm-smmu/smmu-v3' into for-joerg/arm-smmu/updates (2019-08-23 15:05:45 +0100)

----------------------------------------------------------------
Robin Murphy (18):
      iommu/arm-smmu: Mask TLBI address correctly
      iommu/qcom: Mask TLBI addresses correctly
      iommu/arm-smmu: Convert GR0 registers to bitfields
      iommu/arm-smmu: Convert GR1 registers to bitfields
      iommu/arm-smmu: Convert context bank registers to bitfields
      iommu/arm-smmu: Rework cb_base handling
      iommu/arm-smmu: Split arm_smmu_tlb_inv_range_nosync()
      iommu/arm-smmu: Get rid of weird "atomic" write
      iommu/arm-smmu: Abstract GR1 accesses
      iommu/arm-smmu: Abstract context bank accesses
      iommu/arm-smmu: Abstract GR0 accesses
      iommu/arm-smmu: Rename arm-smmu-regs.h
      iommu/arm-smmu: Add implementation infrastructure
      iommu/arm-smmu: Move Secure access quirk to implementation
      iommu/arm-smmu: Add configuration implementation hook
      iommu/arm-smmu: Add reset implementation hook
      iommu/arm-smmu: Add context init implementation hook
      iommu/arm-smmu: Ensure 64-bit I/O accessors are available on 32-bit CPU

Will Deacon (16):
      iommu/arm-smmu-v3: Separate s/w and h/w views of prod and cons indexes
      iommu/arm-smmu-v3: Drop unused 'q' argument from Q_OVF macro
      iommu/arm-smmu-v3: Move low-level queue fields out of arm_smmu_queue
      iommu/arm-smmu-v3: Operate directly on low-level queue where possible
      iommu/arm-smmu-v3: Reduce contention during command-queue insertion
      iommu/arm-smmu-v3: Defer TLB invalidation until ->iotlb_sync()
      iommu/arm-smmu: Make private implementation details static
      iommu/arm-smmu-v3: Document ordering guarantees of command insertion
      iommu/arm-smmu-v3: Disable detection of ATS and PRI
      iommu/arm-smmu-v3: Remove boolean bitfield for 'ats_enabled' flag
      iommu/arm-smmu-v3: Don't issue CMD_SYNC for zero-length invalidations
      iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters
      iommu/arm-smmu-v3: Fix ATC invalidation ordering wrt main TLBs
      iommu/arm-smmu-v3: Avoid locking on invalidation path when not using ATS
      Revert "iommu/arm-smmu-v3: Disable detection of ATS and PRI"
      Merge branches 'for-joerg/arm-smmu/smmu-v2' and 'for-joerg/arm-smmu/smmu-v3' into for-joerg/arm-smmu/updates

 MAINTAINERS                   |   3 +-
 drivers/iommu/Makefile        |   2 +-
 drivers/iommu/arm-smmu-impl.c | 174 ++++++++
 drivers/iommu/arm-smmu-regs.h | 210 ----------
 drivers/iommu/arm-smmu-v3.c   | 945 +++++++++++++++++++++++++++++++-----------
 drivers/iommu/arm-smmu.c      | 579 ++++++++------------------
 drivers/iommu/arm-smmu.h      | 402 ++++++++++++++++++
 drivers/iommu/qcom_iommu.c    |  17 +-
 8 files changed, 1482 insertions(+), 850 deletions(-)
 create mode 100644 drivers/iommu/arm-smmu-impl.c
 delete mode 100644 drivers/iommu/arm-smmu-regs.h
 create mode 100644 drivers/iommu/arm-smmu.h
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