Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 26 Jun 2023 18:25:28 +0200
From:   Andrew Jones <ajones@ventanamicro.com>
To:     Conor Dooley <conor.dooley@microchip.com>
Cc:     palmer@dabbelt.com, conor@kernel.org,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Heiko Stuebner <heiko.stuebner@vrull.eu>,
        Evan Green <evan@rivosinc.com>,
        Sunil V L <sunilvl@ventanamicro.com>,
        linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 9/9] RISC-V: try new extension properties in
 of_early_processor_hartid()
Message-ID: <20230626-9ed40a55c71d2fe50ed3b8da@orel>
References: <20230626-provable-angrily-81760e8c3cc6@wendy>
 <20230626-ardently-caress-7c5886566ea6@wendy>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230626-ardently-caress-7c5886566ea6@wendy>
Precedence: bulk

On Mon, Jun 26, 2023 at 12:19:47PM +0100, Conor Dooley wrote:
> To fully deprecate the kernel's use of "riscv,isa",
> of_early_processor_hartid() needs to first try using the new properties,
> before falling back to "riscv,isa".
> 
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  arch/riscv/kernel/cpu.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 046d9d3dac16..332574f27c95 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -61,8 +61,29 @@ int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *har
>  		return -ENODEV;
>  	}
>  
> +	if (of_property_read_string(node, "riscv,isa-base", &isa))
> +		goto old_interface;
> +
> +	if (IS_ENABLED(CONFIG_32BIT) && strncasecmp(isa, "rv32i", 5))
> +		return -ENODEV;
> +
> +	if (IS_ENABLED(CONFIG_64BIT) && strncasecmp(isa, "rv64i", 5))
> +		return -ENODEV;
> +
> +	if (!of_property_present(node, "riscv,isa-extensions"))
> +		return -ENODEV;
> +
> +	if (of_property_match_string(node, "riscv,isa-extensions", "i") < 0 ||
> +	    of_property_match_string(node, "riscv,isa-extensions", "m") < 0 ||
> +	    of_property_match_string(node, "riscv,isa-extensions", "a") < 0)
> +		return -ENODEV;
> +
> +	return 0;
> +
> +old_interface:
>  	if (of_property_read_string(node, "riscv,isa", &isa)) {
> -		pr_warn("CPU with hartid=%lu has no \"riscv,isa\" property\n", *hart);
> +		pr_warn("CPU with hartid=%lu has no \"riscv,isa-base\" or \"riscv,isa\" property\n",
> +			*hart);
>  		return -ENODEV;
>  	}
>  
> -- 
> 2.40.1
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>