linux-kernel - Re: [PATCH v4 02/13] irqchip/riscv-intc: Allow large non-standard interrupt number

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Date:   Fri, 08 Dec 2023 16:54:34 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Yu Chien Peter Lin <peterlin@...estech.com>, acme@...nel.org,
        adrian.hunter@...el.com, ajones@...tanamicro.com,
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Subject: Re: [PATCH v4 02/13] irqchip/riscv-intc: Allow large non-standard
 interrupt number

On Wed, Nov 22 2023 at 20:12, Yu Chien Peter Lin wrote:
> Currently, the implementation of the RISC-V INTC driver uses the
> interrupt cause as hwirq and has a limitation of supporting a

s/hwirq/hardware interrupt/

Please spell things out. We are not on Xitter here.

> maximum of 64 hwirqs. However, according to the privileged spec,
> interrupt causes >= 16 are defined for platform use.
>
> This limitation prevents us from fully utilizing the available

This limitation prevents to fully utilize the ... 

> local interrupt sources. Additionally, the hwirqs used on RISC-V
> are sparse, with only interrupt numbers 1, 5 and 9 (plus Sscofpmf
> or T-Head's PMU irq) being currently used for supervisor mode.
>
> Switch to using irq_domain_create_tree() to create the radix tree
> map, so a larger number of hardware interrupts can be handled.