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Subject[RFC PATCH 0/8] RISC-V CPU Idle Support
Date
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

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