linux-kernel - Re: [PATCH 1/2] docs: Add advanced extended IRQ model description

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Date: Wed, 8 May 2024 15:29:43 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Tianyang Zhang <zhangtianyang@...ngson.cn>, chenhuacai@...nel.org,
 kernel@...0n.name, corbet@....net, alexs@...nel.org, siyanteng@...ngson.cn
Cc: loongarch@...ts.linux.dev, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] docs: Add advanced extended IRQ model description

Hi--

On 5/7/24 5:22 AM, Tianyang Zhang wrote:
> From 3C6000, Loongarch began to support advanced extended
> interrupt mode, in which each CPU has an independent interrupt
> vector number.This will enhance the architecture's ability
> to support modern devices
> 
> Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
> ---
>  .../arch/loongarch/irq-chip-model.rst         | 33 +++++++++++++++++
>  .../zh_CN/arch/loongarch/irq-chip-model.rst   | 37 +++++++++++++++++--
>  2 files changed, 67 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/arch/loongarch/irq-chip-model.rst b/Documentation/arch/loongarch/irq-chip-model.rst
> index 7988f4192363..79228741d1b9 100644
> --- a/Documentation/arch/loongarch/irq-chip-model.rst
> +++ b/Documentation/arch/loongarch/irq-chip-model.rst
> @@ -85,6 +85,39 @@ to CPUINTC directly::
>      | Devices |
>      +---------+
>  
> +Advanced Extended IRQ model
> +=======================

The === underline line needs to be at least as long as the line above it.

> +
> +In this model, IPI (Inter-Processor Interrupt) and CPU Local Timer interrupt go
> +to CPUINTC directly, CPU UARTS interrupts go to LIOINTC, MSI interrupts go to AVEC,
> +and then go to CPUINTC, Other devices interrupts go to PCH-PIC/PCH-LPC and gathered

                  CPUINTC.

> +by EIOINTC, and then go to CPUINTC directly::
> +
> + +-----+     +--------------------------+     +-------+
> + | IPI | --> |           CPUINTC        | <-- | Timer |
> + +-----+     +--------------------------+     +-------+
> +              ^        ^             ^
> +              |        |             |
> +      +--------+  +---------+ +---------+     +-------+
> +      | AVEC   |  | EIOINTC | | LIOINTC | <-- | UARTs |
> +      +--------+  +---------+ +---------+     +-------+
> +           ^            ^
> +           |            |
> +         +---------+  +---------+
> +         |   MSI   |  | PCH-PIC |
> +         +---------+  +---------+
> +            ^          ^       ^
> +            |          |       |
> +    +---------+ +---------+ +---------+
> +    | Devices | | PCH-LPC | | Devices |
> +    +---------+ +---------+ +---------+
> +                     ^
> +                     |
> +                +---------+
> +                | Devices |
> +                +---------+
> +
> +
>  ACPI-related definitions
>  ========================
>  

thanks.
-- 
#Randy
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