linux-kernel - Re: [PATCH] cpuidle: riscv-sbi: Fix CPU_PM_CPU_IDLE_ENTER

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Message-ID: <CAAhSdy0zGaZXoJHVAN+2n1sP4+2rsfo+G874NeBMgrhBeEW2ZA@mail.gmail.com>
Date:   Mon, 29 Aug 2022 08:29:45 +0530
From:   Anup Patel <anup@...infault.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Atish Patra <atishp@...shpatra.org>,
        Alistair Francis <Alistair.Francis@....com>,
        linux-pm@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>
Subject: Re: [PATCH] cpuidle: riscv-sbi: Fix CPU_PM_CPU_IDLE_ENTER_xyz() macro usage

Hi Palmer,

On Mon, Jul 18, 2022 at 2:16 PM Anup Patel <apatel@...tanamicro.com> wrote:
>
> Currently, we are using CPU_PM_CPU_IDLE_ENTER_PARAM() for all SBI HSM
> suspend types so retentive suspend types are also treated non-retentive
> and kernel will do redundant additional work for these states.
>
> The BIT[31] of SBI HSM suspend types allows us to differentiate between
> retentive and non-retentive suspend types so we should use this BIT
> to call appropriate CPU_PM_CPU_IDLE_ENTER_xyz() macro.
>
> Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>

Can you please take this patch through the RISC-V tree ?

Regards,
Anup

> ---
>  drivers/cpuidle/cpuidle-riscv-sbi.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
> index 1151e5e2ba82..33c92fec4365 100644
> --- a/drivers/cpuidle/cpuidle-riscv-sbi.c
> +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
> @@ -97,8 +97,13 @@ static int sbi_cpuidle_enter_state(struct cpuidle_device *dev,
>                                    struct cpuidle_driver *drv, int idx)
>  {
>         u32 *states = __this_cpu_read(sbi_cpuidle_data.states);
> +       u32 state = states[idx];
>
> -       return CPU_PM_CPU_IDLE_ENTER_PARAM(sbi_suspend, idx, states[idx]);
> +       if (state & SBI_HSM_SUSP_NON_RET_BIT)
> +               return CPU_PM_CPU_IDLE_ENTER_PARAM(sbi_suspend, idx, state);
> +       else
> +               return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(sbi_suspend,
> +                                                            idx, state);
>  }
>
>  static int __sbi_enter_domain_idle_state(struct cpuidle_device *dev,
> --
> 2.34.1
>