linux-kernel - Re: [RFC PATCH v2 08/10] perf: RISC-V: Introduce Andes PMU for perf event sampling

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Message-ID: <20231019-daybed-preschool-8663d5a86798@spud>
Date:   Thu, 19 Oct 2023 17:02:18 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Yu Chien Peter Lin <peterlin@...estech.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, will@...nel.org, mark.rutland@....com,
        atishp@...shpatra.org, anup@...infault.org,
        conor.dooley@...rochip.com, ajones@...tanamicro.com,
        heiko@...ech.de, jszhang@...nel.org, evan@...osinc.com,
        sunilvl@...tanamicro.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        prabhakar.mahadev-lad.rj@...renesas.com, tim609@...estech.com,
        dylan@...estech.com, locus84@...estech.com, dminus@...estech.com,
        Leo Yu-Chi Liang <ycliang@...estech.com>
Subject: Re: [RFC PATCH v2 08/10] perf: RISC-V: Introduce Andes PMU for perf
 event sampling

On Thu, Oct 19, 2023 at 10:01:56PM +0800, Yu Chien Peter Lin wrote:
> The Andes PMU extension provides the same mechanism as Sscofpmf,
> allowing us to reuse the SBI PMU driver to support event sampling
> and mode filtering.
> 
> To make use of this custom PMU extension, "xandespmu" needs
> to be appended to the riscv,isa-extensions for each cpu node
> in device-tree, and enable CONFIG_ANDES_CUSTOM_PMU.
> 
> Signed-off-by: Yu Chien Peter Lin <peterlin@...estech.com>
> Reviewed-by: Charles Ci-Jyun Wu <dminus@...estech.com>
> Reviewed-by: Leo Yu-Chi Liang <ycliang@...estech.com>
> Co-developed-by: Locus Wei-Han Chen <locus84@...estech.com>
> Signed-off-by: Locus Wei-Han Chen <locus84@...estech.com>
> ---
> Changes v1 -> v2:
>   - New patch
> ---
>  arch/riscv/include/asm/hwcap.h |  1 +
>  arch/riscv/kernel/cpufeature.c |  1 +
>  drivers/perf/Kconfig           | 14 ++++++++++++++
>  drivers/perf/riscv_pmu_sbi.c   | 35 +++++++++++++++++++++++++++++-----
>  4 files changed, 46 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index d3082391c901..eecfe95d5050 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -59,6 +59,7 @@
>  #define RISCV_ISA_EXT_ZIFENCEI		41
>  #define RISCV_ISA_EXT_ZIHPM		42
>  #define RISCV_ISA_EXT_XTHEADPMU		43
> +#define RISCV_ISA_EXT_XANDESPMU		44
>  
>  #define RISCV_ISA_EXT_MAX		64
>  
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 4a3fb017026c..a8e71c6dfb3e 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -182,6 +182,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
>  	__RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT),
>  	__RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
>  	__RISCV_ISA_EXT_DATA(xtheadpmu, RISCV_ISA_EXT_XTHEADPMU),
> +	__RISCV_ISA_EXT_DATA(xandespmu, RISCV_ISA_EXT_XANDESPMU),

This does not following the ordering convention (see the comment above
this datastructure) and is not documented in the dt-binding AFAICT.

Cheers,
Conor.

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