[PATCH v10 00/10] iommu/amd: Use 128-bit cmpxchg operation to update DTE

From: Suravee Suthikulpanit
Date: Wed Nov 13 2024 - 07:06:47 EST


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.

Please note that I have verified with the hardware designer, and they have
confirmed that the IOMMU hardware has always been implemented with 256-bit
read. The next revision of the IOMMU spec will be updated to correctly
describe this part. Therefore, I have updated the implementation to avoid
unnecessary flushing.

Changes in v10:
* Patch 3: Update patch from Uros.
* Patch 5,7: Change to use __READ_ONCE() with 128-bit data type.

v9: https://lore.kernel.org/lkml/20241101162304.4688-1-suravee.suthikulpanit@xxxxxxx/
v8: https://lore.kernel.org/lkml/20241031184243.4184-1-suravee.suthikulpanit@xxxxxxx/
v7: https://lore.kernel.org/lkml/20241031091624.4895-1-suravee.suthikulpanit@xxxxxxx/
v6: https://lore.kernel.org/lkml/20241016051756.4317-1-suravee.suthikulpanit@xxxxxxx/
v5: https://lore.kernel.org/lkml/20241007041353.4756-1-suravee.suthikulpanit@xxxxxxx/
v4: https://lore.kernel.org/lkml/20240916171805.324292-1-suravee.suthikulpanit@xxxxxxx/
v3: https://lore.kernel.org/lkml/20240906121308.5013-1-suravee.suthikulpanit@xxxxxxx/
v2: https://lore.kernel.org/lkml/20240829180726.5022-1-suravee.suthikulpanit@xxxxxxx/
v1: https://lore.kernel.org/lkml/20240819161839.4657-1-suravee.suthikulpanit@xxxxxxx/

Thanks,
Suravee

Suravee Suthikulpanit (9):
iommu/amd: Misc ACPI IVRS debug info clean up
iommu/amd: Disable AMD IOMMU if CMPXCHG16B feature is not supported
iommu/amd: Introduce struct ivhd_dte_flags to store persistent DTE
flags
iommu/amd: Introduce helper function to update 256-bit DTE
iommu/amd: Modify set_dte_entry() to use 256-bit DTE helpers
iommu/amd: Introduce helper function get_dte256()
iommu/amd: Modify clear_dte_entry() to avoid in-place update
iommu/amd: Lock DTE before updating the entry with WRITE_ONCE()
iommu/amd: Remove amd_iommu_apply_erratum_63()

Uros Bizjak (1):
compiler_types.h: Introduce 128-bit unqualified scalar type support

drivers/iommu/amd/amd_iommu.h | 4 +-
drivers/iommu/amd/amd_iommu_types.h | 41 ++-
drivers/iommu/amd/init.c | 229 +++++++++--------
drivers/iommu/amd/iommu.c | 370 ++++++++++++++++++++--------
include/linux/compiler_types.h | 13 +
5 files changed, 445 insertions(+), 212 deletions(-)

--
2.34.1