[PATCH v3 00/23] Linux SBI MPXY and RPMI drivers

Anup Patel
2025-05-11T13:40:04Z

The SBI v3.0 (MPXY extension) [1] and RPMI v1.0 [2] specifications
are frozen and in public review at the RISC-V International.

Currently, most of the RPMI and MPXY drivers are in OpenSBI whereas
Linux only has SBI MPXY mailbox controller driver, RPMI clock driver
and RPMI system MSI driver This series also includes ACPI support
for SBI MPXY mailbox controller and RPMI system MSI drivers.

These patches can be found in the riscv_sbi_mpxy_mailbox_v3 branch
at: https://github.com/avpatel/linux.git

To test these patches, boot Linux on "virt,rpmi=on,aia=aplic-imsic"
machine with OpenSBI and QEMU from the dev-upstream branch at:
https://github.com/ventanamicro/opensbi.git
https://github.com/ventanamicro/qemu.git

[1] https://github.com/riscv-non-isa/riscv-sbi-doc/releases
[2] https://github.com/riscv-non-isa/riscv-rpmi/releases

Changes since v2:
- Dropped the "RFC" tag from series since the SBI v3.0 and
RPMI v1.0 specifications are now frozen
- Rebased the series on Linux-6.15-rc5
- Split PATCH8 of v2 into two patches adding separate DT
bindings for "riscv,rpmi-mpxy-clock" and "riscv,rpmi-clock"
- Split PATCH10 of v2 into two patches adding separate DT
bindings for "riscv,rpmi-mpxy-system-msi" and
"riscv,rpmi-system-msi"
- Addressed comments from TGLX on PATCH11 of v2 adding irqchip
driver for RPMI system MSI
- Addressed ACPI related comments in PATCH15 and PATCH16 of v2
- New PATCH17 and PATCH18 in this series

Changes since v1:
- Addressed DT bindings related comments in PATCH2, PATCH3, and
PATCH7 of v1 series
- Addressed comments in PATCH6 and PATCH8 of v1 series
- New PATCH6 in v2 series to allow fwnode based mailbox channel
request
- New PATCH10 and PATCH11 to add RPMI system MSI based interrupt
controller driver
- New PATCH12 to PATCH16 which adds ACPI support in SBI MPXY
mailbox driver and RPMI system MSI driver
- New PATCH17 to enable required kconfig option to allow graceful
shutdown on QEMU virt machine

Anup Patel (14):
riscv: Add new error codes defined by SBI v3.0
dt-bindings: mailbox: Add bindings for RPMI shared memory transport
dt-bindings: mailbox: Add bindings for RISC-V SBI MPXY extension
RISC-V: Add defines for the SBI message proxy extension
mailbox: Add common header for RPMI messages sent via mailbox
mailbox: Allow controller specific mapping using fwnode
mailbox: Add RISC-V SBI message proxy (MPXY) based mailbox driver
dt-bindings: clock: Add RPMI clock service message proxy bindings
dt-bindings: clock: Add RPMI clock service controller bindings
dt-bindings: Add RPMI system MSI message proxy bindings
dt-bindings: Add RPMI system MSI interrupt controller bindings
irqchip: Add driver for the RPMI system MSI service group
RISC-V: Enable GPIO keyboard and event device in RV64 defconfig
MAINTAINERS: Add entry for RISC-V RPMI and MPXY drivers

Rahul Pathak (1):
clk: Add clock driver for the RISC-V RPMI clock service group

Sunil V L (8):
ACPI: property: Refactor acpi_fwnode_get_reference_args()
ACPI: property: Add support for cells property
ACPI: scan: Update honor list for RPMI System MSI
ACPI: RISC-V: Create interrupt controller list in sorted order
ACPI: RISC-V: Add support to update gsi range
ACPI: RISC-V: Add RPMI System MSI to GSI mapping
mailbox/riscv-sbi-mpxy: Add ACPI support
irqchip/riscv-rpmi-sysmsi: Add ACPI support

.../bindings/clock/riscv,rpmi-clock.yaml | 61 +
.../bindings/clock/riscv,rpmi-mpxy-clock.yaml | 64 ++
.../riscv,rpmi-mpxy-system-msi.yaml | 67 ++
.../riscv,rpmi-system-msi.yaml | 74 ++
.../mailbox/riscv,rpmi-shmem-mbox.yaml | 148 +++
.../bindings/mailbox/riscv,sbi-mpxy-mbox.yaml | 51 +
MAINTAINERS | 15 +
arch/riscv/configs/defconfig | 2 +
arch/riscv/include/asm/irq.h | 6 +
arch/riscv/include/asm/sbi.h | 72 ++
drivers/acpi/property.c | 118 +-
drivers/acpi/riscv/irq.c | 80 +-
drivers/acpi/scan.c | 2 +
drivers/base/property.c | 2 +-
drivers/clk/Kconfig | 8 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-rpmi.c | 601 ++++++++++
drivers/irqchip/Kconfig | 7 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-riscv-rpmi-sysmsi.c | 315 ++++++
drivers/mailbox/Kconfig | 11 +
drivers/mailbox/Makefile | 2 +
drivers/mailbox/mailbox.c | 48 +-
drivers/mailbox/riscv-sbi-mpxy-mbox.c | 1007 +++++++++++++++++
include/linux/mailbox/riscv-rpmi-message.h | 235 ++++
include/linux/mailbox_controller.h | 3 +
26 files changed, 2925 insertions(+), 76 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml
create mode 100644 Documentation/devicetree/bindings/clock/riscv,rpmi-mpxy-clock.yaml
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-mpxy-system-msi.yaml
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-system-msi.yaml
create mode 100644 Documentation/devicetree/bindings/mailbox/riscv,rpmi-shmem-mbox.yaml
create mode 100644 Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
create mode 100644 drivers/clk/clk-rpmi.c
create mode 100644 drivers/irqchip/irq-riscv-rpmi-sysmsi.c
create mode 100644 drivers/mailbox/riscv-sbi-mpxy-mbox.c
create mode 100644 include/linux/mailbox/riscv-rpmi-message.h

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2.43.0