kernel/linux.git/drivers/acpi/riscv/init.c, branch linux-7.0.y

ACPI: RISC-V: Add support for RIMT

2025-09-05T13:06:03+00:00

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: Sunil V L Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250818045807.763922-2-sunilvl@ventanamicro.com Signed-off-by: Joerg Roedel

ACPI: introduce acpi_arch_init()

2024-11-22T20:32:25+00:00

To avoid arch-specific code in general ACPI initialization flow, introduce a weak symbol acpi_arch_init(). Currently, arm64 and riscv can utillize this to insert their arch-specific flow. In the future, other architectures can also have a chance to define their own arch-specific ACPI initialization process if necessary. Reviewed-by: Sunil V L Reviewed-by: Sudeep Holla Acked-by: Hanjun Guo Signed-off-by: Miao Wang Link: https://patch.msgid.link/20241121-intro-acpi-arch-init-v4-1-b1fb517e7d8b@gmail.com [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki

ACPI: RISC-V: Initialize GSI mapping structures

2024-08-27T13:48:35+00:00

RISC-V has PLIC and APLIC in MADT as well as namespace devices. Initialize the list of those structures using MADT and namespace devices to create mapping between the ACPI handle and the GSI ranges. This will be used later to add dependencies. Signed-off-by: Sunil V L Tested-by: Björn Töpel Link: https://patch.msgid.link/20240812005929.113499-12-sunilvl@ventanamicro.com Signed-off-by: Rafael J. Wysocki

ACPI: bus: Add acpi_riscv_init() function

2024-08-27T13:48:35+00:00

Add a new function for RISC-V to do architecture specific initialization similar to acpi_arm_init(). Some of the ACPI tables are architecture specific and there is no reason trying to find them on other architectures. So, add acpi_riscv_init() similar to acpi_arm_init(). Signed-off-by: Sunil V L Tested-by: Björn Töpel Link: https://patch.msgid.link/20240812005929.113499-4-sunilvl@ventanamicro.com Signed-off-by: Rafael J. Wysocki