linux-kernel - Re: [PATCH v9 4/8] RISC-V: Add SBI HSM suspend related defines

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Date:   Tue, 12 Oct 2021 20:36:50 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        linux-riscv@...ts.infradead.org
Cc:     Sandeep Tripathy <milun.tripathy@...il.com>,
        Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Liush <liush@...winnertech.com>,
        Anup Patel <anup@...infault.org>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Anup Patel <anup.patel@....com>,
        Anup Patel <anup.patel@....com>
Subject: Re: [PATCH v9 4/8] RISC-V: Add SBI HSM suspend related defines

Hi Anup,

Am Dienstag, 12. Oktober 2021, 11:58:53 CEST schrieb Anup Patel:
> We add defines related to SBI HSM suspend call and also
> update HSM states naming as-per latest SBI specification.
> 
> Signed-off-by: Anup Patel <anup.patel@....com>

Looks like this patch depends on your SRST patch.
("RISC-V: Use SBI SRST extension when available").

Looking at the history this seems to have been last posted in june 2021
with the conversation stalling around july.

I guess as this was so long ago, that patch might've dropped out of
peoples inboxes and a resend might be in order?


Heiko

> ---
>  arch/riscv/include/asm/sbi.h    | 27 ++++++++++++++++++++++-----
>  arch/riscv/kernel/cpu_ops_sbi.c |  2 +-
>  2 files changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index 289621da4a2a..ab9782f8da52 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -62,15 +62,32 @@ enum sbi_ext_hsm_fid {
>  	SBI_EXT_HSM_HART_START = 0,
>  	SBI_EXT_HSM_HART_STOP,
>  	SBI_EXT_HSM_HART_STATUS,
> +	SBI_EXT_HSM_HART_SUSPEND,
>  };
>  
> -enum sbi_hsm_hart_status {
> -	SBI_HSM_HART_STATUS_STARTED = 0,
> -	SBI_HSM_HART_STATUS_STOPPED,
> -	SBI_HSM_HART_STATUS_START_PENDING,
> -	SBI_HSM_HART_STATUS_STOP_PENDING,
> +enum sbi_hsm_hart_state {
> +	SBI_HSM_STATE_STARTED = 0,
> +	SBI_HSM_STATE_STOPPED,
> +	SBI_HSM_STATE_START_PENDING,
> +	SBI_HSM_STATE_STOP_PENDING,
> +	SBI_HSM_STATE_SUSPENDED,
> +	SBI_HSM_STATE_SUSPEND_PENDING,
> +	SBI_HSM_STATE_RESUME_PENDING,
>  };
>  
> +#define SBI_HSM_SUSP_BASE_MASK			0x7fffffff
> +#define SBI_HSM_SUSP_NON_RET_BIT		0x80000000
> +#define SBI_HSM_SUSP_PLAT_BASE			0x10000000
> +
> +#define SBI_HSM_SUSPEND_RET_DEFAULT		0x00000000
> +#define SBI_HSM_SUSPEND_RET_PLATFORM		SBI_HSM_SUSP_PLAT_BASE
> +#define SBI_HSM_SUSPEND_RET_LAST		SBI_HSM_SUSP_BASE_MASK
> +#define SBI_HSM_SUSPEND_NON_RET_DEFAULT		SBI_HSM_SUSP_NON_RET_BIT
> +#define SBI_HSM_SUSPEND_NON_RET_PLATFORM	(SBI_HSM_SUSP_NON_RET_BIT | \
> +						 SBI_HSM_SUSP_PLAT_BASE)
> +#define SBI_HSM_SUSPEND_NON_RET_LAST		(SBI_HSM_SUSP_NON_RET_BIT | \
> +						 SBI_HSM_SUSP_BASE_MASK)
> +
>  enum sbi_ext_srst_fid {
>  	SBI_EXT_SRST_RESET = 0,
>  };
> diff --git a/arch/riscv/kernel/cpu_ops_sbi.c b/arch/riscv/kernel/cpu_ops_sbi.c
> index 685fae72b7f5..5fd90f03a3e9 100644
> --- a/arch/riscv/kernel/cpu_ops_sbi.c
> +++ b/arch/riscv/kernel/cpu_ops_sbi.c
> @@ -97,7 +97,7 @@ static int sbi_cpu_is_stopped(unsigned int cpuid)
>  
>  	rc = sbi_hsm_hart_get_status(hartid);
>  
> -	if (rc == SBI_HSM_HART_STATUS_STOPPED)
> +	if (rc == SBI_HSM_STATE_STOPPED)
>  		return 0;
>  	return rc;
>  }
>