[PATCH v3 0/5] iommu/amd: Use 128-bit cmpxchg operation to update DTE

[Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>]

This series modifies current implementation to use 128-bit cmpxchg to update DTE
when needed as specified in the AMD I/O Virtualization Techonology (IOMMU)
Specification.

Changes in V3:
  * Patch 2:
    - Consolidate patch 2 and 3
    - Change rw_semaphore to spin_lock
  * Patch 3: Expand locking across 256-bit DTE read and update
  * Patch 4: Fix clear_dte_entry()
  * Patch 5: Consolidate amd_iommu_set_dirty_tracking() and set_dte_irq_entry() fixes

v2: https://lore.kernel.org/lkml/20240829180726.5022-1-suravee.suthikulpanit@amd.com/
v1 :https://lore.kernel.org/lkml/e937e26f-038a-6d01-76a9-76c86760ca4a@gmail.com/T/

Thanks,
Suravee

Suravee Suthikulpanit (5):
  iommu/amd: Disable AMD IOMMU if CMPXCHG16B feature is not supported
  iommu/amd: Introduce helper functions to access and update 256-bit DTE
  iommu/amd: Modify set_dte_entry() to use 256-bit DTE helpers
  iommu/amd: Modify clear_dte_entry() to avoid in-place update
  iommu/amd: Do not update DTE in-place in amd_iommu_set_dirty_tracking
    and set_dte_irq_entry

 drivers/iommu/amd/amd_iommu_types.h |   8 +-
 drivers/iommu/amd/init.c            |  23 +--
 drivers/iommu/amd/iommu.c           | 272 +++++++++++++++++++---------
 3 files changed, 201 insertions(+), 102 deletions(-)

-- 
2.34.1