linux-kernel - [PATCH V1 1/2] docs: Add advanced extended IRQ model description

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Message-Id: <20240604125015.18678-1-zhangtianyang@loongson.cn>
Date: Tue,  4 Jun 2024 20:50:15 +0800
From: Tianyang Zhang <zhangtianyang@...ngson.cn>
To: 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,
	Tianyang Zhang <zhangtianyang@...ngson.cn>
Subject: [PATCH V1 1/2] docs: Add advanced extended IRQ model description

>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..4fb24077b23b 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
+===========================
+
+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
+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
 ========================
 
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 f1e9ab18206c..cadf38589059 100644
--- a/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
+++ b/Documentation/translations/zh_CN/arch/loongarch/irq-chip-model.rst
@@ -9,9 +9,8 @@
 LoongArch的IRQ芯片模型（层级关系）
 ==================================
 
-目前，基于LoongArch的处理器（如龙芯3A5000）只能与LS7A芯片组配合工作。LoongArch计算机
-中的中断控制器（即IRQ芯片）包括CPUINTC（CPU Core Interrupt Controller）、LIOINTC（
-Legacy I/O Interrupt Controller）、EIOINTC（Extended I/O Interrupt Controller）、
+LoongArch计算机中的中断控制器（即IRQ芯片）包括CPUINTC（CPU Core Interrupt Controller）、
+LIOINTC（Legacy I/O Interrupt Controller）、EIOINTC（Extended I/O Interrupt Controller）、
 HTVECINTC（Hyper-Transport Vector Interrupt Controller）、PCH-PIC（LS7A芯片组的主中
 断控制器）、PCH-LPC（LS7A芯片组的LPC中断控制器）和PCH-MSI（MSI中断控制器）。
 
@@ -87,6 +86,38 @@ PCH-LPC/PCH-MSI，然后被EIOINTC统一收集，再直接到达CPUINTC::
     | Devices |
     +---------+
 
+高级扩展IRQ模型
+=======================
+
+在这种模型里面，IPI（Inter-Processor Interrupt）和CPU本地时钟中断直接发送到CPUINTC，
+CPU串口（UARTs）中断发送到LIOINTC，MSI中断发送到AVEC，而后通过AVEC送达CPUINTC，而
+其他所有设备的中断则分别发送到所连接的PCH-PIC/PCH-LPC，然后由EIOINTC统一收集，再直
+接到达CPUINTC::
+
+ +-----+     +--------------------------+     +-------+
+ | IPI | --> |           CPUINTC        | <-- | Timer |
+ +-----+     +--------------------------+     +-------+
+              ^        ^             ^
+              |        |             |
+      +--------+  +---------+ +---------+     +-------+
+      | AVEC   |  | EIOINTC | | LIOINTC | <-- | UARTs |
+      +--------+  +---------+ +---------+     +-------+
+              ^        ^
+              |        |
+      +---------+  +-------------+
+      |   MSI   |  |   PCH-PIC   |
+      +---------+  +-------------+
+            ^          ^       ^
+            |          |       |
+    +---------+ +---------+ +---------+
+    | Devices | | PCH-LPC | | Devices |
+    +---------+ +---------+ +---------+
+                     ^
+                     |
+                +---------+
+                | Devices |
+                +---------+
+
 ACPI相关的定义
 ==============
 
-- 
2.20.1