linux-kernel - Re: [PATCH v2 1/2] Docs/LoongArch: Add Advanced Extended-Redirect IRQ model description

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Message-ID: <d9b6f34c-95f2-45f6-b5dc-89098d1f8d22@linux.dev>
Date: Tue, 1 Apr 2025 09:39:57 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Tianyang Zhang <zhangtianyang@...ngson.cn>, chenhuacai@...nel.org,
 kernel@...0n.name, corbet@....net, alexs@...nel.org, tglx@...utronix.de,
 jiaxun.yang@...goat.com, peterz@...radead.org, wangliupu@...ngson.cn,
 lvjianmin@...ngson.cn, maobibo@...ngson.cn, siyanteng@...oftware.com.cn,
 gaosong@...ngson.cn, yangtiezhu@...ngson.cn
Cc: loongarch@...ts.linux.dev, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Docs/LoongArch: Add Advanced Extended-Redirect IRQ
 model description


在 3/31/25 2:41 PM, Tianyang Zhang 写道:
> Introduce the redirect interrupt controllers.When the redirect interrupt
> controller is enabled, the routing target of MSI interrupts is no longer a
> specific CPU and vector number, but a specific redirect entry. The actual
> CPU and vector number used are described by the redirect entry.
>
> Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
> ---
>   .../arch/loongarch/irq-chip-model.rst         | 38 +++++++++++++++++++
>   .../zh_CN/arch/loongarch/irq-chip-model.rst   | 37 ++++++++++++++++++
>   2 files changed, 75 insertions(+)
>
> diff --git a/Documentation/arch/loongarch/irq-chip-model.rst b/Documentation/arch/loongarch/irq-chip-model.rst
> index a7ecce11e445..84fafb86ec17 100644
> --- a/Documentation/arch/loongarch/irq-chip-model.rst
> +++ b/Documentation/arch/loongarch/irq-chip-model.rst
> @@ -181,6 +181,44 @@ go to PCH-PIC/PCH-LPC and gathered by EIOINTC, and then go to CPUINTC directly::
>                | Devices |
>                +---------+
>   

> +Advanced Extended IRQ model (with redirection)
> +===============

Did you do the build test?


> +
> +In this model, IPI (Inter-Processor Interrupt) and CPU Local Timer interrupt go
> +to CPUINTC directly, CPU UARTS interrupts go to LIOINTC, PCH-MSI interrupts go
> +to REDIRECT for remapping it to AVEC, and then go to CPUINTC directly, while all
> +other devices interrupts go to PCH-PIC/PCH-LPC and gathered by EIOINTC, and then
> +go to CPUINTC directly::
> +
> + +-----+     +-----------------------+     +-------+
> + | IPI | --> |        CPUINTC        | <-- | Timer |
> + +-----+     +-----------------------+     +-------+
> +              ^          ^          ^
> +              |          |          |
> +       +---------+ +----------+ +---------+     +-------+
> +       | EIOINTC | | AVECINTC | | LIOINTC | <-- | UARTs |
> +       +---------+ +----------+ +---------+     +-------+
> +            ^            ^
> +            |            |
> +            |      +----------+
> +            |      | REDIRECT |
> +            |      +----------+
> +            |            ^
> +            |            |
> +       +---------+  +---------+
> +       | PCH-PIC |  | PCH-MSI |
> +       +---------+  +---------+
> +         ^     ^           ^
> +         |     |           |
> + +---------+ +---------+ +---------+
> + | Devices | | PCH-LPC | | Devices |
> + +---------+ +---------+ +---------+
> +                  ^
> +                  |
> +             +---------+
> +             | Devices |
> +             +---------+
> +
>   ACPI-related definitions
>   ========================
>   
> diff --git a/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst b/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> index d4ff80de47b6..5d82cba07482 100644
> --- a/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> +++ b/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
> @@ -174,6 +174,43 @@ CPU串口（UARTs）中断发送到LIOINTC，PCH-MSI中断发送到AVECINTC，
>                | Devices |
>                +---------+
>   

> +高级扩展IRQ模型 (带重定向)
> +===============

ditto


Thanks,

Yanteng