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

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Date:   Mon, 18 Jul 2022 19:27:50 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Atish Patra <atishp@...shpatra.org>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>, linux-pm@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuidle: riscv-sbi: Fix CPU_PM_CPU_IDLE_ENTER_xyz()
 macro usage

On Mon, Jul 18, 2022 at 02:15:53PM +0530, Anup Patel 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>
> ---
>  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
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>