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From:   Anup Patel <anup@brainfault.org>
Date:   Tue, 22 Jun 2021 10:19:11 +0530
Message-ID: <CAAhSdy00KAqg37PCAGwNXt_2HTpxGY68yTPNHDEbrSwdiLa2jw@mail.gmail.com>
Subject: Re: [PATCH v7 0/8] RISC-V CPU Idle Support
To:     Anup Patel <anup.patel@wdc.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Palmer Dabbelt <palmerdabbelt@google.com>
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>,
        Sandeep Tripathy <milun.tripathy@gmail.com>,
        Atish Patra <atish.patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        Liush <liush@allwinnertech.com>,
        DTML <devicetree@vger.kernel.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>,
        "open list:THERMAL" <linux-pm@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
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Hi Palmer,

On Thu, Jun 10, 2021 at 10:52 AM Anup Patel <anup.patel@wdc.com> wrote:
>
> 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 share 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_v7 branch at
> https://github.com/avpatel/linux
>
> 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).
>
> Changes since v6:
>  - Fixed error reported by "make DT_CHECKER_FLAGS=-m dt_binding_check"
>
> Changes since v5:
>  - Rebased on Linux-5.13-rc5
>  - Removed unnecessary exports from PATCH5
>  - Removed stray ";" from PATCH5
>  - Moved sbi_cpuidle_pd_power_off() under "#ifdef CONFIG_DT_IDLE_GENPD"
>    in PATCH6
>
> Changes since v4:
>  - Rebased on Linux-5.13-rc2
>  - Renamed all dt_idle_genpd functions to have "dt_idle_" prefix
>  - Added MAINTAINERS file entry for dt_idle_genpd
>
> Changes since v3:
>  - Rebased on Linux-5.13-rc2
>  - Fixed __cpu_resume_enter() which was broken due to XIP kernel support
>  - Removed "struct dt_idle_genpd_ops" abstraction which simplifies code
>    sharing between ARM PSCI and RISC-V SBI drivers in PATCH5
>
> Changes since v2:
>  - Rebased on Linux-5.12-rc3
>  - Updated PATCH7 to add common DT bindings for both ARM and RISC-V
>    idle states
>  - Added "additionalProperties = false" for both idle-states node and
>    child nodes in PATCH7
>
> Changes since v1:
>  - Fixex minor typo in PATCH1
>  - Use just "idle-states" as DT node name for CPU idle states
>  - Added documentation for "cpu-idle-states" DT property in
>    devicetree/bindings/riscv/cpus.yaml
>  - Added documentation for "riscv,sbi-suspend-param" DT property in
>    devicetree/bindings/riscv/idle-states.yaml
>
> 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 common bindings for ARM and RISC-V idle states
>   RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt machine

Can you please review this series ?

It would be nice to consider this series for Linux-5.14.

Regards,
Anup

>
>  .../bindings/arm/msm/qcom,idle-state.txt      |   2 +-
>  .../devicetree/bindings/arm/psci.yaml         |   2 +-
>  .../bindings/{arm => cpu}/idle-states.yaml    | 228 ++++++-
>  .../devicetree/bindings/riscv/cpus.yaml       |   6 +
>  MAINTAINERS                                   |  14 +
>  arch/riscv/Kconfig                            |   7 +
>  arch/riscv/Kconfig.socs                       |   3 +
>  arch/riscv/configs/defconfig                  |  13 +-
>  arch/riscv/configs/rv32_defconfig             |   6 +-
>  arch/riscv/include/asm/asm.h                  |  17 +
>  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                      |  18 +-
>  arch/riscv/kernel/process.c                   |   3 +-
>  arch/riscv/kernel/suspend.c                   |  86 +++
>  arch/riscv/kernel/suspend_entry.S             | 123 ++++
>  drivers/cpuidle/Kconfig                       |   9 +
>  drivers/cpuidle/Kconfig.arm                   |   1 +
>  drivers/cpuidle/Kconfig.riscv                 |  15 +
>  drivers/cpuidle/Makefile                      |   5 +
>  drivers/cpuidle/cpuidle-psci-domain.c         | 138 +---
>  drivers/cpuidle/cpuidle-psci.h                |  15 +-
>  drivers/cpuidle/cpuidle-sbi.c                 | 626 ++++++++++++++++++
>  drivers/cpuidle/dt_idle_genpd.c               | 177 +++++
>  drivers/cpuidle/dt_idle_genpd.h               |  50 ++
>  29 files changed, 1472 insertions(+), 185 deletions(-)
>  rename Documentation/devicetree/bindings/{arm => cpu}/idle-states.yaml (74%)
>  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
>  create mode 100644 drivers/cpuidle/dt_idle_genpd.c
>  create mode 100644 drivers/cpuidle/dt_idle_genpd.h
>
> --
> 2.25.1
>