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To: Yu Chien Peter Lin <peterlin@andestech.com>, acme@kernel.org,
 adrian.hunter@intel.com, ajones@ventanamicro.com,
 alexander.shishkin@linux.intel.com, andre.przywara@arm.com,
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 conor+dt@kernel.org, conor.dooley@microchip.com, conor@kernel.org,
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 geert+renesas@glider.be, guoren@kernel.org, heiko@sntech.de,
 irogers@google.com, jernej.skrabec@gmail.com, jolsa@kernel.org,
 jszhang@kernel.org, krzysztof.kozlowski+dt@linaro.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 linux-perf-users@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
 linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev,
 locus84@andestech.com, magnus.damm@gmail.com, mark.rutland@arm.com,
 mingo@redhat.com, n.shubin@yadro.com, namhyung@kernel.org,
 palmer@dabbelt.com, paul.walmsley@sifive.com, peterlin@andestech.com,
 peterz@infradead.org, prabhakar.mahadev-lad.rj@bp.renesas.com,
 rdunlap@infradead.org, robh+dt@kernel.org, samuel@sholland.org,
 sunilvl@ventanamicro.com, tim609@andestech.com, uwu@icenowy.me,
 wens@csie.org, will@kernel.org, ycliang@andestech.com,
 inochiama@outlook.com
Subject: Re: [PATCH v4 02/13] irqchip/riscv-intc: Allow large non-standard
 interrupt number
In-Reply-To: <20231122121235.827122-3-peterlin@andestech.com>
References: <20231122121235.827122-1-peterlin@andestech.com>
 <20231122121235.827122-3-peterlin@andestech.com>
Date: Fri, 08 Dec 2023 16:54:34 +0100
Message-ID: <871qbwsn9h.ffs@tglx>
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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.