[PATCH v2 0/3] RISC-V: Add ACPI support for IOMMU

From: Sunil V L
Date: Tue Jun 10 2025 - 06:49:03 EST


This series adds support for RISC-V IOMMU on ACPI based platforms.
RISC-V IO Mapping Table (RIMT) is a new static ACPI table [1] introduced
to communicate IOMMU information to the OS.

[1] - https://github.com/riscv-non-isa/riscv-acpi-rimt/releases/download/v1.0/rimt-spec.pdf

Changes since v1:
1) Rebased to v6.16-rc1.
2) Dropped ACPICA patch since it is already available in 6.16-rc1.
3) Added Rafael's ACK.
4) Fixed few issues found by bots.

Sunil V L (3):
ACPI: RISC-V: Add support for RIMT
ACPI: scan: Add support for RISC-V in acpi_iommu_configure_id()
iommu/riscv: Add ACPI support

MAINTAINERS | 1 +
arch/riscv/Kconfig | 1 +
drivers/acpi/Kconfig | 4 +
drivers/acpi/riscv/Kconfig | 7 +
drivers/acpi/riscv/Makefile | 1 +
drivers/acpi/riscv/init.c | 2 +
drivers/acpi/riscv/init.h | 1 +
drivers/acpi/riscv/rimt.c | 523 +++++++++++++++++++++++++++
drivers/acpi/scan.c | 9 +-
drivers/iommu/riscv/iommu-platform.c | 17 +-
drivers/iommu/riscv/iommu.c | 10 +
include/linux/acpi_rimt.h | 26 ++
12 files changed, 599 insertions(+), 3 deletions(-)
create mode 100644 drivers/acpi/riscv/Kconfig
create mode 100644 drivers/acpi/riscv/rimt.c
create mode 100644 include/linux/acpi_rimt.h

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