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Message-ID: <mhng-4ec1093a-4542-429e-a9f0-8a976cff9ac4@palmer-ri-x1c9>
Date: Wed, 04 Oct 2023 07:07:11 -0700 (PDT)
From: Palmer Dabbelt <palmer@...belt.com>
To: apatel@...tanamicro.com
CC: pbonzini@...hat.com, atishp@...shpatra.org,
Paul Walmsley <paul.walmsley@...ive.com>,
Conor Dooley <conor@...nel.org>, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, shuah@...nel.org,
ajones@...tanamicro.com, mchitale@...tanamicro.com,
devicetree@...r.kernel.org, kvm@...r.kernel.org,
kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
apatel@...tanamicro.com, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v3 2/6] RISC-V: Detect Zicond from ISA string
On Mon, 02 Oct 2023 20:52:22 PDT (-0700), apatel@...tanamicro.com wrote:
> The RISC-V integer conditional (Zicond) operation extension defines
> standard conditional arithmetic and conditional-select/move operations
> which are inspired from the XVentanaCondOps extension. In fact, QEMU
> RISC-V also has support for emulating Zicond extension.
>
> Let us detect Zicond extension from ISA string available through
> DT or ACPI.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> arch/riscv/include/asm/hwcap.h | 1 +
> arch/riscv/kernel/cpufeature.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 0f520f7d058a..6fc51c1b34cf 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_SMSTATEEN 43
> +#define RISCV_ISA_EXT_ZICOND 44
>
> #define RISCV_ISA_EXT_MAX 64
>
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 3755a8c2a9de..e3803822ab5a 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -167,6 +167,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
> __RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
> __RISCV_ISA_EXT_DATA(zicboz, RISCV_ISA_EXT_ZICBOZ),
> __RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
> + __RISCV_ISA_EXT_DATA(zicond, RISCV_ISA_EXT_ZICOND),
> __RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),
> __RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
> __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
Acked-by: Palmer Dabbelt <palmer@...osinc.com>
Can we do a shared tag, though? These will conflict.
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