Re: [PATCH v16 2/9] irqchip: Add RISC-V incoming MSI controller early driver

From: Eric Cheng <eric.cheng.linux@gmail.com>
To: Anup Patel <apatel@ventanamicro.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Conor Dooley <conor+dt@kernel.org>
Cc: devicetree@vger.kernel.org,
	"Saravana Kannan" <saravanak@google.com>,
	"Marc Zyngier" <maz@kernel.org>,
	"Anup Patel" <anup@brainfault.org>,
	linux-kernel@vger.kernel.org, "Björn Töpel" <bjorn@kernel.org>,
	"Atish Patra" <atishp@atishpatra.org>,
	linux-riscv@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	"Andrew Jones" <ajones@ventanamicro.com>
Subject: Re: [PATCH v16 2/9] irqchip: Add RISC-V incoming MSI controller early driver
Date: Fri, 19 Apr 2024 11:23:20 +0800	[thread overview]
Message-ID: <8738cb85-fac1-4a15-9666-eb05316f5368@gmail.com> (raw)
In-Reply-To: <20240307140307.646078-3-apatel@ventanamicro.com>

On 3/7/2024 10:03 PM, Anup Patel wrote:

> +static int __init imsic_parse_fwnode(struct fwnode_handle *fwnode,
> +				     struct imsic_global_config *global,
> +				     u32 *nr_parent_irqs,
> +				     u32 *nr_mmios)
> +{

...

> +	/*
> +	 * Find first bit position of group index.
> +	 * If not specified assumed the default APLIC-IMSIC configuration.
> +	 */
> +	rc = of_property_read_u32(to_of_node(fwnode), "riscv,group-index-shift",
> +				  &global->group_index_shift);
> +	if (rc)
> +		global->group_index_shift = IMSIC_MMIO_PAGE_SHIFT * 2;
> +
> +	/* Find number of interrupt identities */
> +	rc = of_property_read_u32(to_of_node(fwnode), "riscv,num-ids",
> +				  &global->nr_ids);

Will here check if the pass-in interrupt identity number is (multi-64 -1) && 
between [63, 2047]?
Per spec AIA v1.0, Sec. 3.1 Interrupt files and interrupt identities:
"The number of interrupt identities supported by an interrupt file (and hence 
the number of active
bits in each array) is one less than a multiple of 64, and may be a minimum of 
63 and a maximum
of 2047."

> +	if (rc) {
> +		pr_err("%pfwP: number of interrupt identities not found\n", fwnode);
> +		return rc;
> +	}
> +
...

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