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

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Date: Fri, 19 Apr 2024 11:23:20 +0800
From: Eric Cheng <eric.cheng.linux@...il.com>
To: Anup Patel <apatel@...tanamicro.com>, Palmer Dabbelt
 <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>,
 Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Frank Rowand <frowand.list@...il.com>, Conor Dooley <conor+dt@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>, Björn Töpel
 <bjorn@...nel.org>, Atish Patra <atishp@...shpatra.org>,
 Andrew Jones <ajones@...tanamicro.com>, Sunil V L
 <sunilvl@...tanamicro.com>, Saravana Kannan <saravanak@...gle.com>,
 Anup Patel <anup@...infault.org>, linux-riscv@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v16 2/9] irqchip: Add RISC-V incoming MSI controller early
 driver

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;
> +	}
> +
..