This series adds RISC-V CPU Idle support using SBI HSM suspend function. The RISC-V SBI CPU idle driver added by this series is highly inspired from the ARM PSCI CPU idle driver.
At high-level, this series includes the following changes: 1) Preparatory arch/riscv patches (Patches 1 to 3) 2) Defines for RISC-V SBI HSM suspend (Patch 4) 3) Preparatory patch to shared code between RISC-V SBI CPU idle driver and ARM PSCI CPU idle driver (Patch 5) 4) RISC-V SBI CPU idle driver and related DT bindings (Patches 6 to 7) These patches can be found in riscv_sbi_hsm_suspend_v1 branch at https://github.com/avpatel/linux The proposed SBI HSM suspend definition can be found in hsm_suspend_v3 branch at https://github.com/avpatel/riscv-sbi-doc The OpenSBI implementation of SBI HSM suspend function can be found in hsm_suspend_v1 branch at https://github.com/avpatel/opensbi Special thanks Sandeep Tripathy for providing early feeback on SBI HSM support in all above projects (RISC-V SBI specification, OpenSBI, and Linux RISC-V). Anup Patel (8): RISC-V: Enable CPU_IDLE drivers RISC-V: Rename relocate() and make it global RISC-V: Add arch functions for non-retentive suspend entry/exit RISC-V: Add SBI HSM suspend related defines cpuidle: Factor-out power domain related code from PSCI domain driver cpuidle: Add RISC-V SBI CPU idle driver dt-bindings: Add bindings documentation for RISC-V idle states RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt machine .../bindings/riscv/idle-states.yaml | 250 +++++++++ MAINTAINERS | 8 + arch/riscv/Kconfig | 7 + arch/riscv/Kconfig.socs | 3 + arch/riscv/configs/defconfig | 8 +- arch/riscv/configs/rv32_defconfig | 5 +- arch/riscv/include/asm/cpuidle.h | 24 + arch/riscv/include/asm/sbi.h | 27 +- arch/riscv/include/asm/suspend.h | 35 ++ arch/riscv/kernel/Makefile | 2 + arch/riscv/kernel/asm-offsets.c | 3 + arch/riscv/kernel/cpu_ops_sbi.c | 2 +- arch/riscv/kernel/head.S | 7 +- arch/riscv/kernel/process.c | 3 +- arch/riscv/kernel/suspend.c | 86 +++ arch/riscv/kernel/suspend_entry.S | 116 ++++ drivers/cpuidle/Kconfig | 9 + drivers/cpuidle/Kconfig.arm | 1 + drivers/cpuidle/Kconfig.riscv | 15 + drivers/cpuidle/Makefile | 5 + drivers/cpuidle/cpuidle-psci-domain.c | 244 +-------- drivers/cpuidle/cpuidle-psci.h | 15 +- drivers/cpuidle/cpuidle-sbi.c | 503 ++++++++++++++++++ ...{cpuidle-psci-domain.c => dt_idle_genpd.c} | 165 ++---- drivers/cpuidle/dt_idle_genpd.h | 42 ++ 25 files changed, 1218 insertions(+), 367 deletions(-) create mode 100644 Documentation/devicetree/bindings/riscv/idle-states.yaml create mode 100644 arch/riscv/include/asm/cpuidle.h create mode 100644 arch/riscv/include/asm/suspend.h create mode 100644 arch/riscv/kernel/suspend.c create mode 100644 arch/riscv/kernel/suspend_entry.S create mode 100644 drivers/cpuidle/Kconfig.riscv create mode 100644 drivers/cpuidle/cpuidle-sbi.c copy drivers/cpuidle/{cpuidle-psci-domain.c => dt_idle_genpd.c} (52%) create mode 100644 drivers/cpuidle/dt_idle_genpd.h -- 2.25.1
