This patch series enables the basic ACPI infrastructure for RISC-V. Supporting external interrupt controllers is in progress and hence it is tested using poll based HVC SBI console and RAM disk. The first patch in this series is one of the patch from Jisheng's series [1] which is not merged yet. This patch is required to support ACPI since efi_init() which gets called before sbi_init() can enable static branches and hits panic. The series depends on Anup's IPI improvement series [2]. [1] https://lore.kernel.org/all/20220821140918.3613-1-jszhang@xxxxxxxxxx/ [2] https://lore.kernel.org/lkml/20230103141221.772261-7-apatel@xxxxxxxxxxxxxxxx/T/ Changes since V1: 1) Dropped PCI changes and instead added dummy interfaces just to enable building ACPI core when CONFIG_PCI is enabled. Actual PCI changes will be added in future along with external interrupt controller support in ACPI. 2) Squashed couple of patches so that new code added gets built in each commit. 3) Fixed the missing wake_cpu code in timer refactor patch as pointed by Conor 4) Fixed an issue with SMP disabled. 5) Addressed other comments from Conor. 6) Updated documentation patch as per feedback from Sanjaya. 7) Fixed W=1 and checkpatch --strict issues. 8) Added ACK/RB tags These changes are available at https://github.com/vlsunil/linux/commits/acpi_b1_us_review_ipi17_V2 Testing: 1) Build Qemu with ACPI support using below branch https://github.com/vlsunil/qemu/tree/acpi_b1_us_review_V3 2) Build EDK2 as per instructions in https://github.com/vlsunil/riscv-uefi-edk2-docs/wiki/RISC-V-Qemu-Virt-support 3) Build Linux after enabling SBI HVC and SBI earlycon CONFIG_RISCV_SBI_V01=y CONFIG_SERIAL_EARLYCON_RISCV_SBI=y CONFIG_HVC_RISCV_SBI=y 4) Build buildroot. Run with below command. qemu-system-riscv64 -nographic \ -drive file=Build/RiscVVirtQemu/RELEASE_GCC5/FV/RISCV_VIRT.fd,if=pflash,format=raw,unit=1 \ -machine virt,acpi -smp 16 -m 2G \ -kernel arch/riscv/boot/Image \ -initrd buildroot/output/images/rootfs.cpio \ -append "root=/dev/ram ro console=hvc0 earlycon=sbi" Jisheng Zhang (1): riscv: move sbi_init() earlier before jump_label_init() Sunil V L (20): ACPICA: MADT: Add RISC-V INTC interrupt controller ACPICA: Add structure definitions for RISC-V RHCT RISC-V: Add support to build the ACPI core ACPI: Kconfig: Enable ACPI_PROCESSOR for RISC-V ACPI: OSL: Make should_use_kmap() 0 for RISC-V. ACPI: processor_core: RISC-V: Enable mapping processor to the hartid drivers/acpi: RISC-V: Add RHCT related code RISC-V: smpboot: Create wrapper smp_setup() RISC-V: smpboot: Add ACPI support in smp_setup() RISC-V: ACPI: Add a function to retrieve the hartid RISC-V: cpufeature: Add ACPI support in riscv_fill_hwcap() RISC-V: cpu: Enable cpuinfo for ACPI systems irqchip/riscv-intc: Add ACPI support clocksource/timer-riscv: Refactor riscv_timer_init_dt() clocksource/timer-riscv: Add ACPI support RISC-V: time.c: Add ACPI support for time_init() RISC-V: Add ACPI initialization in setup_arch() RISC-V: Enable ACPI in defconfig MAINTAINERS: Add entry for drivers/acpi/riscv Documentation/kernel-parameters.txt: Add RISC-V for ACPI parameter .../admin-guide/kernel-parameters.txt | 8 +- MAINTAINERS | 7 + arch/riscv/Kconfig | 5 + arch/riscv/configs/defconfig | 2 + arch/riscv/include/asm/acenv.h | 11 + arch/riscv/include/asm/acpi.h | 87 ++++++ arch/riscv/include/asm/cpu.h | 8 + arch/riscv/kernel/Makefile | 2 + arch/riscv/kernel/acpi.c | 248 ++++++++++++++++++ arch/riscv/kernel/cpu.c | 31 ++- arch/riscv/kernel/cpufeature.c | 41 ++- arch/riscv/kernel/setup.c | 27 +- arch/riscv/kernel/smpboot.c | 75 +++++- arch/riscv/kernel/time.c | 25 +- drivers/acpi/Kconfig | 2 +- drivers/acpi/Makefile | 2 + drivers/acpi/osl.c | 2 +- drivers/acpi/processor_core.c | 29 ++ drivers/acpi/riscv/Makefile | 2 + drivers/acpi/riscv/rhct.c | 92 +++++++ drivers/clocksource/timer-riscv.c | 93 ++++--- drivers/irqchip/irq-riscv-intc.c | 78 +++++- include/acpi/actbl2.h | 68 ++++- 23 files changed, 854 insertions(+), 91 deletions(-) create mode 100644 arch/riscv/include/asm/acenv.h create mode 100644 arch/riscv/include/asm/acpi.h create mode 100644 arch/riscv/include/asm/cpu.h create mode 100644 arch/riscv/kernel/acpi.c create mode 100644 drivers/acpi/riscv/Makefile create mode 100644 drivers/acpi/riscv/rhct.c -- 2.34.1
