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Message-ID: <098e4920-f2dc-afc7-824d-bae7d3a260fa@loongson.cn>
Date: Wed, 20 Jul 2022 17:54:14 +0800
From: Jianmin Lv <lvjianmin@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, loongarch@...ts.linux.dev,
Hanjun Guo <guohanjun@...wei.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH V17 00/13] irqchip: Add LoongArch-related irqchip drivers
Hi, Huacai,
I'll address the two issues and submit V18.
Thanks.
On 2022/7/20 上午11:22, Huacai Chen wrote:
> Hi, Marc and Jianmin,
>
> I have done the integrated test on top of V17, together with PCI code
> and arch code [1]. From my point of view, this series is good enough,
> except two small issues in patch 10 and patch 12.
>
> [1] https://github.com/loongson/linux/commits/loongarch-next
>
> Thanks,
> Huacai
>
>
>
> On Wed, Jul 20, 2022 at 10:01 AM Jianmin Lv <lvjianmin@...ngson.cn> 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), 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 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 way.
>>
>> 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.
>>
>> Example of irqchip topology in a system with two chipsets:
>>
>> +------------------------------------------------------------+
>> | |
>> | +------------------+ |
>> | | CPUINTC | |
>> | +------------------+ |
>> | ^ ^ |
>> | | | |
>> | +----------+ +----------+ |
>> | | EIOINTC 0| | EIOINTC 1| |
>> | +----------+ +----------+ |
>> | ^ ^ ^ ^ |
>> | | | | | |
>> | +----------+ +----------+ +----------+ +----------+ |
>> | | PCH-PIC 0| | PCH-MSI 0| | PCH-PIC 1| | PCH-MSI 1| |
>> | +----------+ +----------+ +----------+ +----------+ |
>> | |
>> | |
>> +------------------------------------------------------------+
>>
>> For systems with two chipsets, there are tow group(consists of EIOINTC, PCH-PIC and PCH-MSI) irqdomains,
>> and each group has same node id. So we defined a structure to mantain the relation of node and it's parent irqdomain.
>>
>> struct acpi_vector_group {
>> int node;
>> int pci_segment;
>> struct irq_domain *parent;
>> };
>>
>> The initialization and use of acpi_vector_group array are following:
>>
>> 1 Entry of struct acpi_vector_group array initialization:
>>
>> By parsing MCFG, the node id（from bit44-47 of Base Address）and pci segment are extracted. And from MADT, we have the node id of each EIOINTC.
>>
>> entry.node = node id of pci segment
>> entry.pci_segment = pci segment (only for msi irqdomain)
>>
>> By matching node id of entry and EIOINTC to set parent.
>>
>> entry.parent = EIOINTC irqdomain(node id of EIOINTC == node id of pci segment)
>>
>> 2 Get parent irqdomain for PCH-PIC:
>>
>> From MADT, we have the node id of each PCH-PIC(from bit44-47 of Base Address).
>> if (node of entry i == node of PCH-PIC)
>> return entrys[i].parent;
>>
>> 3 Get parent irqdomain for PCH-MSI of pci segment:
>>
>> return entrys[i].parent; (i is the index of msi irqdomain)
>>
>> 4 How to select a correct irqdomain to map irq for a device?
>> For devices using legacy irq behind PCH-PIC, GSI is used to select correct PCH-PIC irqdomain.
>> For devices using msi irq behind PCH-MSI, the pci segmen of the device is used to select correct PCH-MSI irqdomain.
>>
>> 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.
>>
>> RFC -> RFC V2:
>> 1, Move all IO-interrupt related code to driver/irqchip from arch directory.
>> 2. Add description for an example of two chipsets system.
>>
>> RFC V2 -> RFC V3:
>> 1, Add support for multiple GSI domains
>> 2, Use ACPI_GENERIC_GSI for GSI handling
>> 3, Drop suspend-resume stuff
>> 4, Export fwnode handles instead of irq domain handles
>>
>> RFC V3 -> V12:
>> 1, Address patch attributions of the patch series
>>
>> V12 -> V13
>> 1 Based on 5.19-rc2
>> 2 Remove arch specified gsi code
>> 3 Split some 'common' code into the various drivers where they belong.
>> 4 Allow acpi_gsi_to_irq() to have an arch-specific fallback
>>
>> V13 -> V14
>> 1 Add LoongArch-specified APICs definition
>> 2 Use the way in CPUINTC driver to call pch-pic and pch-msi entry
>> 3 Fix compiling and regression issue for OF path
>>
>> V14 -> V15
>> 1 Expose fwnode_handle of CPUINTC domain instead of using get_xxx_irq() for CPUINTC driver
>> 2 Fix EIOINTC driver: delete parent_data referencing and fix set_affinity bug
>> 3 Use acpi_disabled for DT and ACPI runtime code path
>> 4 Fix return type of arch-specific acpi_gsi_to_irq fallback
>> 5 Fix compile bug tested by kernel test robot
>>
>> V15 -> V16
>>
>> 1 Merge entry function to make code simpler for cpuintc driver
>> 2 Provisionally add ACPICA data structures
>> 3 Drop "Legacy" model support
>> 4 Fix compiling error
>>
>> V16 - V17
>>
>> 1 Adjust order of the patch preparing to support multiple bridges
>> 2 Split the patch removing COMPLE_TEST into pch-pic and pch-msi patches
>> 3 Change some function name for consistency and remove a redundant blank
>>
>> Huacai Chen (6):
>> irqchip: Add Loongson PCH LPC controller support
>> irqchip/loongson-pch-pic: Add ACPI init support
>> irqchip/loongson-pch-msi: Add ACPI init support
>> irqchip/loongson-liointc: Add ACPI init support
>> irqchip: Add Loongson Extended I/O interrupt controller support
>> irqchip: Add LoongArch CPU interrupt controller support
>>
>> Jianmin Lv (4):
>> genirq/generic_chip: export irq_unmap_generic_chip
>> LoongArch: Use ACPI_GENERIC_GSI for gsi handling
>> LoongArch: Prepare to support multiple pch-pic and pch-msi irqdomain
>> irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch
>>
>> Marc Zyngier (3):
>> LoongArch: Provisionally add ACPICA data structures
>> APCI: irq: Add support for multiple GSI domains
>> ACPI: irq: Allow acpi_gsi_to_irq() to have an arch-specific fallback
>>
>> arch/loongarch/Kconfig | 1 +
>> arch/loongarch/include/asm/acpi.h | 142 ++++++++++
>> arch/loongarch/include/asm/irq.h | 51 ++--
>> arch/loongarch/kernel/acpi.c | 65 -----
>> arch/loongarch/kernel/irq.c | 58 +++-
>> arch/loongarch/kernel/time.c | 14 +-
>> arch/mips/include/asm/mach-loongson64/irq.h | 2 +-
>> drivers/acpi/bus.c | 3 +
>> drivers/acpi/irq.c | 58 ++--
>> drivers/irqchip/Kconfig | 32 ++-
>> drivers/irqchip/Makefile | 3 +
>> drivers/irqchip/irq-gic-v3.c | 18 +-
>> drivers/irqchip/irq-gic.c | 18 +-
>> drivers/irqchip/irq-loongarch-cpu.c | 149 +++++++++++
>> drivers/irqchip/irq-loongson-eiointc.c | 395 ++++++++++++++++++++++++++++
>> drivers/irqchip/irq-loongson-liointc.c | 204 ++++++++------
>> drivers/irqchip/irq-loongson-pch-lpc.c | 205 +++++++++++++++
>> drivers/irqchip/irq-loongson-pch-msi.c | 127 ++++++---
>> drivers/irqchip/irq-loongson-pch-pic.c | 177 ++++++++++---
>> include/linux/acpi.h | 4 +-
>> include/linux/cpuhotplug.h | 1 +
>> include/linux/irq.h | 1 +
>> kernel/irq/generic-chip.c | 2 +-
>> 23 files changed, 1451 insertions(+), 279 deletions(-)
>> create mode 100644 drivers/irqchip/irq-loongarch-cpu.c
>> create mode 100644 drivers/irqchip/irq-loongson-eiointc.c
>> create mode 100644 drivers/irqchip/irq-loongson-pch-lpc.c
>>
>> --
>> 1.8.3.1
>>
>>
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