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Message-ID: <9c99241f-6214-8c1c-7d15-7bbbc1b06b85@loongson.cn>
Date: Mon, 16 May 2022 21:13:05 +0800
From: Jianmin Lv <lvjianmin@...ngson.cn>
To: Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc: linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
Huacai Chen <chenhuacai@...il.com>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH RFC 00/10] irqchip: Add LoongArch-related irqchip drivers
On 2022/5/15 上午11:37, Jianmin Lv wrote:
> LoongArch is a new RISC ISA, which is a bit like MIPS or RISC-V.
> LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit
> version (LA32S) and a 64-bit version (LA64). LoongArch use ACPI as its
> boot protocol LoongArch-specific interrupt controllers (similar to APIC)
> are already added in the ACPI Specification 6.5(which may be published in
> early June this year and the board is reviewing the draft).
>
> Currently, LoongArch based processors (e.g. Loongson-3A5000) can only
> work together with LS7A chipsets. The irq chips in LoongArch computers
> include 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 (Main
> Interrupt Controller in LS7A chipset), PCH-LPC (LPC Interrupt Controller
> in LS7A chipset) and PCH-MSI (MSI Interrupt Controller).
>
> CPUINTC is a per-core controller (in CPU), LIOINTC/EIOINTC/HTVECINTC are
> per-package controllers (in CPU), while PCH-PIC/PCH-LPC/PCH-MSI are all
> controllers out of CPU (i.e., in chipsets). These controllers (in other
> words, irqchips) are linked in a hierarchy, and there are two models of
> hierarchy (legacy model and extended model).
>
> Legacy IRQ model:
>
> In this model, the IPI (Inter-Processor Interrupt) and CPU Local Timer
> interrupt go to CPUINTC directly, CPU UARTS interrupts go to LIOINTC,
> while all other devices interrupts go to PCH-PIC/PCH-LPC/PCH-MSI and
> gathered by HTVECINTC, and then go to LIOINTC, and then CPUINTC.
>
> +---------------------------------------------+
> | |
> | +-----+ +---------+ +-------+ |
> | | IPI | --> | CPUINTC | <-- | Timer | |
> | +-----+ +---------+ +-------+ |
> | ^ |
> | | |
> | +---------+ +-------+ |
> | | LIOINTC | <-- | UARTs | |
> | +---------+ +-------+ |
> | ^ |
> | | |
> | +-----------+ |
> | | HTVECINTC | |
> | +-----------+ |
> | ^ ^ |
> | | | |
> | +---------+ +---------+ |
> | | PCH-PIC | | PCH-MSI | |
> | +---------+ +---------+ |
> | ^ ^ ^ |
> | | | | |
> | +---------+ +---------+ +---------+ |
> | | PCH-LPC | | Devices | | Devices | |
> | +---------+ +---------+ +---------+ |
> | ^ |
> | | |
> | +---------+ |
> | | Devices | |
> | +---------+ |
> | |
> | |
> +---------------------------------------------+
>
> Extended IRQ model:
>
> In this model, the IPI (Inter-Processor Interrupt) and CPU Local Timer
> interrupt go to CPUINTC directly, CPU UARTS interrupts go to LIOINTC,
> while all other devices interrupts go to PCH-PIC/PCH-LPC/PCH-MSI and
> gathered by EIOINTC, and then go to to CPUINTC directly.
>
> +--------------------------------------------------------+
> | |
> | +-----+ +---------+ +-------+ |
> | | IPI | --> | CPUINTC | <-- | Timer | |
> | +-----+ +---------+ +-------+ |
> | ^ ^ |
> | | | |
> | +---------+ +---------+ +-------+ |
> | | EIOINTC | | LIOINTC | <-- | UARTs | |
> | +---------+ +---------+ +-------+ |
> | ^ ^ |
> | | | |
> | +---------+ +---------+ |
> | | PCH-PIC | | PCH-MSI | |
> | +---------+ +---------+ |
> | ^ ^ ^ |
> | | | | |
> | +---------+ +---------+ +---------+ |
> | | PCH-LPC | | Devices | | Devices | |
> | +---------+ +---------+ +---------+ |
> | ^ |
> | | |
> | +---------+ |
> | | Devices | |
> | +---------+ |
> | |
> | |
> +--------------------------------------------------------+
>
> The hierarchy model is constructed by parsing irq contronler structures
> in MADT. Some controllers((e.g. LIOINTC, HTVECINTC, EIOINTC and PCH-LPC)
> are hardcodingly connected to their parents, so their irqdomins are
> separately routed to their parents in a fixed way. Some controllers
> (e.g. PCH-PIC and PCH-MSI) could be routed to different parents for different
> CPU. The firmware will config EIOINTC for the newer CPU and config HTVECINTC
> for old CPU in MADT. By this way, PCH-PIC and PCH-MSI irqdomain can only be
> routed one parent irqdomin: HTVECINTC or EIOINTC.
>
> Cross-compile tool chain to build kernel:
> https://github.com/loongson/build-tools/releases/latest/download/loongarch64-clfs-20211202-cross-tools.tar.xz
>
> A CLFS-based Linux distro:
> https://github.com/loongson/build-tools/releases/latest/download/loongarch64-clfs-system-2021-12-02.tar.bz2
>
> Loongson and LoongArch documentations:
> https://github.com/loongson/LoongArch-Documentation
>
>
> V1 -> V2:
> 1, Remove queued patches;
> 2, Move common logic of DT/ACPI probing to common functions;
> 3, Split .suspend()/.resume() functions to separate patches.
>
> V2 -> V3:
> 1, Fix a bug for loongson-pch-pic probe;
> 2, Some minor improvements for LPC controller.
>
> V3 -> V4:
> 1, Rework the CPU interrupt controller driver;
> 2, Some minor improvements for other controllers.
>
> V4 -> V5:
> 1, Add a description of LoonArch's IRQ model;
> 2, Support multiple EIOINTCs in one system;
> 3, Some minor improvements for other controllers.
>
> V5 -> V6:
> 1, Attach a fwnode to CPUINTC irq domain;
> 2, Use raw spinlock instead of generic spinlock;
> 3, Improve the method of restoring EIOINTC state;
> 4, Update documentation, comments and commit messages.
>
> V6 -> V7:
> 1, Fix build warnings reported by kernel test robot.
>
> V7 -> V8:
> 1, Add arguments sanity checking for irqchip init functions;
> 2, Support Loongson-3C5000 (One NUMA Node includes 4 EIOINTC Node).
>
> V8 -> V9:
> 1, Rebase on 5.17-rc5;
> 2, Update cover letter;
> 3, Some small improvements.
>
> V9 -> V10:
> 1, Rebase on 5.17-rc6;
> 2, Fix build warnings reported by kernel test robot.
>
> V10 -> V11:
> 1, Rebase on 5.18-rc4;
> 2, Fix irq affinity setting for EIOINTC;
> 3, Fix hwirq allocation failure for EIOINTC.
>
> V11 -> RFC:
> 1, Refactored the way to build irqchip hierarchy topology.
>
Hi, Marc
The irqchip topology building is refactored as following way in this RFC
patches according to my reply in V10, please help to review them if they
are correct, thanks very much!
- Only call irqchip_init() in arch file.
- Use IRQCHIP_ACPI_DECLARE to declare entry of CORE PIC.
- Initialize irqdomains in fixed way from their parent irqdomain for
hardcodingly routing irqchips(liointc, htvec, eiointc and pch-lpc) in
hardware.
- Initialize irqdomains in scaled way for scalable routing
irqchips(pch-pic and pch-msi).
- For eiointc and htvec, they are exclusive, and only one kind of them
can be configured in MADT.
> Huacai Chen (1):
> irqchip: Adjust Kconfig for Loongson
>
> Jianmin Lv (9):
> irqchip: Add LoongArch CPU interrupt controller support
> irqchip/loongson-pch-pic: Add ACPI init support
> irqchip/loongson-pch-pic: Add suspend/resume support
> irqchip/loongson-pch-msi: Add ACPI init support
> irqchip/loongson-htvec: Add ACPI init support
> irqchip/loongson-htvec: Add suspend/resume support
> irqchip/loongson-liointc: Add ACPI init support
> irqchip: Add Loongson Extended I/O interrupt controller support
> irqchip: Add Loongson PCH LPC controller support
>
> drivers/irqchip/Kconfig | 38 ++-
> drivers/irqchip/Makefile | 3 +
> drivers/irqchip/irq-loongarch-cpu.c | 134 ++++++++++
> drivers/irqchip/irq-loongarch-pic-common.c | 66 +++++
> drivers/irqchip/irq-loongarch-pic-common.h | 22 ++
> drivers/irqchip/irq-loongson-eiointc.c | 381 +++++++++++++++++++++++++++++
> drivers/irqchip/irq-loongson-htvec.c | 148 ++++++++---
> drivers/irqchip/irq-loongson-liointc.c | 215 ++++++++++------
> drivers/irqchip/irq-loongson-pch-lpc.c | 225 +++++++++++++++++
> drivers/irqchip/irq-loongson-pch-msi.c | 138 +++++++----
> drivers/irqchip/irq-loongson-pch-pic.c | 214 ++++++++++++++--
> include/linux/cpuhotplug.h | 1 +
> 12 files changed, 1398 insertions(+), 187 deletions(-)
> create mode 100644 drivers/irqchip/irq-loongarch-cpu.c
> create mode 100644 drivers/irqchip/irq-loongarch-pic-common.c
> create mode 100644 drivers/irqchip/irq-loongarch-pic-common.h
> create mode 100644 drivers/irqchip/irq-loongson-eiointc.c
> create mode 100644 drivers/irqchip/irq-loongson-pch-lpc.c
>
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