Commit 8f772955 authored by Sunil V L's avatar Sunil V L Committed by Joerg Roedel
Browse files

ACPI: RISC-V: Add support for RIMT 

RISC-V IO Mapping Table (RIMT) is a static ACPI table to communicate
IOMMU information to the OS. The spec is available at [1].

The changes at high level are,
	a) Initialize data structures required for IOMMU/device
	   configuration using the data from RIMT. Provide APIs required
	   for device configuration.
	b) Provide an API for IOMMU drivers to register the
	   fwnode with RIMT data structures. This API will create a
	   fwnode for PCIe IOMMU.

[1] - https://github.com/riscv-non-isa/riscv-acpi-rimt



Signed-off-by: default avatarSunil V L <sunilvl@ventanamicro.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250818045807.763922-2-sunilvl@ventanamicro.com


Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 8f5ae30d

MAINTAINERS

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@@ -347,6 +347,7 @@ L: linux-acpi@vger.kernel.org 
L:	linux-riscv@lists.infradead.org

S:	Maintained

F:	drivers/acpi/riscv/

F:	include/linux/acpi_rimt.h









ACPI PCC(Platform Communication Channel) MAILBOX DRIVER









M:	Sudeep Holla <sudeep.holla@arm.com>
































arch/riscv/Kconfig



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@@ -16,6 +16,7 @@ config RISCV







	select ACPI_MCFG if (ACPI && PCI)









	select ACPI_PPTT if ACPI









	select ACPI_REDUCED_HARDWARE_ONLY if ACPI









	select ACPI_RIMT if ACPI









	select ACPI_SPCR_TABLE if ACPI









	select ARCH_DMA_DEFAULT_COHERENT









	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
































drivers/acpi/Kconfig



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@@ -547,6 +547,10 @@ if ARM64







source "drivers/acpi/arm64/Kconfig"









endif



















if RISCV









source "drivers/acpi/riscv/Kconfig"









endif



















config ACPI_PPTT









	bool










































drivers/acpi/riscv/Kconfig
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# SPDX-License-Identifier: GPL-2.0-only









#









# ACPI Configuration for RISC-V









#



















config ACPI_RIMT









	bool
























drivers/acpi/riscv/Makefile



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@@ -2,3 +2,4 @@







obj-y					+= rhct.o init.o irq.o









obj-$(CONFIG_ACPI_PROCESSOR_IDLE)	+= cpuidle.o









obj-$(CONFIG_ACPI_CPPC_LIB)		+= cppc.o









obj-$(CONFIG_ACPI_RIMT)			+= rimt.o