linux-kernel - Re: [PATCH v2 2/2] RISC-V: Add common csr_read_num() and csr_write

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Message-ID:
 <TY1PPFCDFFFA68A5FC785C784C2E55FFF20F330A@TY1PPFCDFFFA68A.apcprd02.prod.outlook.com>
Date: Tue, 19 Aug 2025 12:04:16 +0800
From: "Nutty.Liu" <nutty.liu@...mail.com>
To: Anup Patel <apatel@...tanamicro.com>, Sunil V L
 <sunilvl@...tanamicro.com>, "Rafael J . Wysocki" <rafael@...nel.org>
Cc: Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Alexandre Ghiti <alex@...ti.fr>,
 Len Brown <lenb@...nel.org>, Atish Patra <atish.patra@...ux.dev>,
 Andrew Jones <ajones@...tanamicro.com>, Anup Patel <anup@...infault.org>,
 Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
 linux-acpi@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] RISC-V: Add common csr_read_num() and
 csr_write_num() functions

On 8/18/2025 10:36 PM, Anup Patel wrote:
> In RISC-V, there is no CSR read/write instruction which takes CSR
> number via register so add common csr_read_num() and csr_write_num()
> functions which allow accessing certain CSRs by passing CSR number
> as parameter. These common functions will be first used by the
> ACPI CPPC driver and RISC-V PMU driver.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>   arch/riscv/include/asm/csr.h |   3 +
>   arch/riscv/kernel/Makefile   |   1 +
>   arch/riscv/kernel/csr.c      | 165 +++++++++++++++++++++++++++++++++++
>   drivers/acpi/riscv/cppc.c    |  17 ++--
>   drivers/perf/riscv_pmu.c     |  54 ++----------
>   5 files changed, 184 insertions(+), 56 deletions(-)
>   create mode 100644 arch/riscv/kernel/csr.c
Reviewed-by: Nutty Liu <nutty.liu@...mail.com>

Thanks,
Nutty