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

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Message-ID: <20250818-ba7d5f923321feb836a408db@orel>
Date: Mon, 18 Aug 2025 09:56:03 -0500
From: Andrew Jones <ajones@...tanamicro.com>
To: Anup Patel <apatel@...tanamicro.com>
Cc: Sunil V L <sunilvl@...tanamicro.com>, 
	"Rafael J . Wysocki" <rafael@...nel.org>, 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>, 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 Mon, Aug 18, 2025 at 08:06:00PM +0530, 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: Andrew Jones <ajones@...tanamicro.com>