The RISC-V AIA specification is now frozen as-per the RISC-V international process. The latest frozen specifcation can be found at: https://github.com/riscv/riscv-aia/releases/download/1.0-RC1/riscv-interrupts-1.0-RC1.pdf At a high-level, the AIA specification adds three things: 1) AIA CSRs - Improved local interrupt support 2) Incoming Message Signaled Interrupt Controller (IMSIC) - Per-HART MSI controller - Support MSI virtualization - Support IPI along with virtualization 3) Advanced Platform-Level Interrupt Controller (APLIC) - Wired interrupt controller - In MSI-mode, converts wired interrupt into MSIs (i.e. MSI generator) - In Direct-mode, injects external interrupts directly into HARTs For an overview of the AIA specification, refer the recent AIA virtualization talk at KVM Forum 2022: https://static.sched.com/hosted_files/kvmforum2022/a1/AIA_Virtualization_in_KVM_RISCV_final.pdf https://www.youtube.com/watch?v=r071dL8Z0yo This series adds required Linux irqchip drivers for AIA and it depends on the recent "RISC-V IPI Improvements". (Refer, https://lore.kernel.org/lkml/20221101143400.690000-1-apatel@xxxxxxxxxxxxxxxx/t/) To test this series, use QEMU v7.2 (or higher) and OpenSBI v1.2 (or higher). These patches can also be found in the riscv_aia_v2 branch at: https://github.com/avpatel/linux.git Changes since v1: - Rebased on Linux-6.2-rc2 - Addressed comments on IMSIC DT bindings for PATCH4 - Use raw_spin_lock_irqsave() on ids_lock for PATCH5 - Improved MMIO alignment checks in PATCH5 to allow MMIO regions with holes. - Addressed comments on APLIC DT bindings for PATCH6 - Fixed warning splat in aplic_msi_write_msg() caused by zeroed MSI message in PATCH7 - Dropped DT property riscv,slow-ipi instead will have module parameter in future. Anup Patel (9): RISC-V: Add AIA related CSR defines RISC-V: Detect AIA CSRs from ISA string irqchip/riscv-intc: Add support for RISC-V AIA dt-bindings: interrupt-controller: Add RISC-V incoming MSI controller irqchip: Add RISC-V incoming MSI controller driver dt-bindings: interrupt-controller: Add RISC-V advanced PLIC irqchip: Add RISC-V advanced PLIC driver RISC-V: Select APLIC and IMSIC drivers MAINTAINERS: Add entry for RISC-V AIA drivers .../interrupt-controller/riscv,aplic.yaml | 159 +++ .../interrupt-controller/riscv,imsics.yaml | 168 +++ MAINTAINERS | 12 + arch/riscv/Kconfig | 2 + arch/riscv/include/asm/csr.h | 92 ++ arch/riscv/include/asm/hwcap.h | 8 + arch/riscv/kernel/cpu.c | 2 + arch/riscv/kernel/cpufeature.c | 2 + drivers/irqchip/Kconfig | 20 +- drivers/irqchip/Makefile | 2 + drivers/irqchip/irq-riscv-aplic.c | 670 ++++++++++ drivers/irqchip/irq-riscv-imsic.c | 1174 +++++++++++++++++ drivers/irqchip/irq-riscv-intc.c | 37 +- include/linux/irqchip/riscv-aplic.h | 117 ++ include/linux/irqchip/riscv-imsic.h | 92 ++ 15 files changed, 2550 insertions(+), 7 deletions(-) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,imsics.yaml create mode 100644 drivers/irqchip/irq-riscv-aplic.c create mode 100644 drivers/irqchip/irq-riscv-imsic.c create mode 100644 include/linux/irqchip/riscv-aplic.h create mode 100644 include/linux/irqchip/riscv-imsic.h -- 2.34.1
