linux-kernel - Re: [v5 2/9] RISC-V: Add CSR encodings for all HPMCOUNTERS

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Date:   Mon, 17 Jan 2022 21:31:37 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atishp@...shpatra.org>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Atish Patra <atishp@...osinc.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Damien Le Moal <damien.lemoal@....com>,
        DTML <devicetree@...r.kernel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [v5 2/9] RISC-V: Add CSR encodings for all HPMCOUNTERS

On Sat, Dec 25, 2021 at 11:17 AM Atish Patra <atishp@...shpatra.org> wrote:
>
> From: Atish Patra <atish.patra@....com>
>
> Linux kernel can directly read these counters as the HPMCOUNTERS CSRs are
> accessible in S-mode.
>
> Signed-off-by: Atish Patra <atish.patra@....com>
> Signed-off-by: Atish Patra <atishp@...osinc.com>

Looks good to me.

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup

> ---
>  arch/riscv/include/asm/csr.h | 58 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
>
> diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
> index 87ac65696871..e4d369830af4 100644
> --- a/arch/riscv/include/asm/csr.h
> +++ b/arch/riscv/include/asm/csr.h
> @@ -89,9 +89,67 @@
>  #define CSR_CYCLE              0xc00
>  #define CSR_TIME               0xc01
>  #define CSR_INSTRET            0xc02
> +#define CSR_HPMCOUNTER3                0xc03
> +#define CSR_HPMCOUNTER4                0xc04
> +#define CSR_HPMCOUNTER5                0xc05
> +#define CSR_HPMCOUNTER6                0xc06
> +#define CSR_HPMCOUNTER7                0xc07
> +#define CSR_HPMCOUNTER8                0xc08
> +#define CSR_HPMCOUNTER9                0xc09
> +#define CSR_HPMCOUNTER10       0xc0a
> +#define CSR_HPMCOUNTER11       0xc0b
> +#define CSR_HPMCOUNTER12       0xc0c
> +#define CSR_HPMCOUNTER13       0xc0d
> +#define CSR_HPMCOUNTER14       0xc0e
> +#define CSR_HPMCOUNTER15       0xc0f
> +#define CSR_HPMCOUNTER16       0xc10
> +#define CSR_HPMCOUNTER17       0xc11
> +#define CSR_HPMCOUNTER18       0xc12
> +#define CSR_HPMCOUNTER19       0xc13
> +#define CSR_HPMCOUNTER20       0xc14
> +#define CSR_HPMCOUNTER21       0xc15
> +#define CSR_HPMCOUNTER22       0xc16
> +#define CSR_HPMCOUNTER23       0xc17
> +#define CSR_HPMCOUNTER24       0xc18
> +#define CSR_HPMCOUNTER25       0xc19
> +#define CSR_HPMCOUNTER26       0xc1a
> +#define CSR_HPMCOUNTER27       0xc1b
> +#define CSR_HPMCOUNTER28       0xc1c
> +#define CSR_HPMCOUNTER29       0xc1d
> +#define CSR_HPMCOUNTER30       0xc1e
> +#define CSR_HPMCOUNTER31       0xc1f
>  #define CSR_CYCLEH             0xc80
>  #define CSR_TIMEH              0xc81
>  #define CSR_INSTRETH           0xc82
> +#define CSR_HPMCOUNTER3H       0xc83
> +#define CSR_HPMCOUNTER4H       0xc84
> +#define CSR_HPMCOUNTER5H       0xc85
> +#define CSR_HPMCOUNTER6H       0xc86
> +#define CSR_HPMCOUNTER7H       0xc87
> +#define CSR_HPMCOUNTER8H       0xc88
> +#define CSR_HPMCOUNTER9H       0xc89
> +#define CSR_HPMCOUNTER10H      0xc8a
> +#define CSR_HPMCOUNTER11H      0xc8b
> +#define CSR_HPMCOUNTER12H      0xc8c
> +#define CSR_HPMCOUNTER13H      0xc8d
> +#define CSR_HPMCOUNTER14H      0xc8e
> +#define CSR_HPMCOUNTER15H      0xc8f
> +#define CSR_HPMCOUNTER16H      0xc90
> +#define CSR_HPMCOUNTER17H      0xc91
> +#define CSR_HPMCOUNTER18H      0xc92
> +#define CSR_HPMCOUNTER19H      0xc93
> +#define CSR_HPMCOUNTER20H      0xc94
> +#define CSR_HPMCOUNTER21H      0xc95
> +#define CSR_HPMCOUNTER22H      0xc96
> +#define CSR_HPMCOUNTER23H      0xc97
> +#define CSR_HPMCOUNTER24H      0xc98
> +#define CSR_HPMCOUNTER25H      0xc99
> +#define CSR_HPMCOUNTER26H      0xc9a
> +#define CSR_HPMCOUNTER27H      0xc9b
> +#define CSR_HPMCOUNTER28H      0xc9c
> +#define CSR_HPMCOUNTER29H      0xc9d
> +#define CSR_HPMCOUNTER30H      0xc9e
> +#define CSR_HPMCOUNTER31H      0xc9f
>
>  #define CSR_SSTATUS            0x100
>  #define CSR_SIE                        0x104
> --
> 2.33.1
>