linux-kernel - Re: [RFC 3/9] RISC-V: Add FIRMWARE_READ

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Message-ID: <20231207-jailbreak-kinsman-7353788a9a40@wendy>
Date:   Thu, 7 Dec 2023 12:11:48 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Atish Patra <atishp@...osinc.com>
CC:     <linux-kernel@...r.kernel.org>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Guo Ren <guoren@...nel.org>, Icenowy Zheng <uwu@...nowy.me>,
        <kvm-riscv@...ts.infradead.org>, <kvm@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [RFC 3/9] RISC-V: Add FIRMWARE_READ_HI definition

On Mon, Dec 04, 2023 at 06:43:04PM -0800, Atish Patra wrote:
> SBI v2.0 added another function to SBI PMU extension to read
> the upper bits of a counter with width larger than XLEN.

This definition here is quite a lot less specific than that in 11/1 of
the spec. I don't think that really matters much in reality since we
only support exactly one XLEN where that is the case.

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

> Add the definition for that function.
> 
> Signed-off-by: Atish Patra <atishp@...osinc.com>
> ---
>  arch/riscv/include/asm/sbi.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index 0892f4421bc4..f3eeca79a02d 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -121,6 +121,7 @@ enum sbi_ext_pmu_fid {
>  	SBI_EXT_PMU_COUNTER_START,
>  	SBI_EXT_PMU_COUNTER_STOP,
>  	SBI_EXT_PMU_COUNTER_FW_READ,
> +	SBI_EXT_PMU_COUNTER_FW_READ_HI,
>  };
>  
>  union sbi_pmu_ctr_info {
> -- 
> 2.34.1
> 

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