linux-kernel - Re: [PATCH v12 00/25] Linux RISC-V AIA Support

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Message-ID: <87le87w080.fsf@all.your.base.are.belong.to.us>
Date: Tue, 30 Jan 2024 12:05:03 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Anup Patel <apatel@...tanamicro.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, Rob
 Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand
 <frowand.list@...il.com>, Conor Dooley <conor+dt@...nel.org>,
 devicetree@...r.kernel.org, Saravana Kannan <saravanak@...gle.com>, Marc
 Zyngier <maz@...nel.org>, Anup Patel <anup@...infault.org>,
 linux-kernel@...r.kernel.org, Atish Patra <atishp@...shpatra.org>,
 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v12 00/25] Linux RISC-V AIA Support

Anup Patel <apatel@...tanamicro.com> writes:

> On Tue, Jan 30, 2024 at 1:22 PM Björn Töpel <bjorn@...nel.org> wrote:
>>
>> Björn Töpel <bjorn@...nel.org> writes:
>>
>> > Anup Patel <apatel@...tanamicro.com> writes:
>> >
>> >> The RISC-V AIA specification is ratified as-per the RISC-V international
>> >> process. The latest ratified AIA specifcation can be found at:
>> >> https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interrupts-1.0.pdf
>> >>
>> >> At a high-level, the AIA specification adds three things:
>> >> 1) AIA CSRs
>> >>    - Improved local interrupt support
>> >> 2) Incoming Message Signaled Interrupt Controller (IMSIC)
>> >>    - Per-HART MSI controller
>> >>    - Support MSI virtualization
>> >>    - Support IPI along with virtualization
>> >> 3) Advanced Platform-Level Interrupt Controller (APLIC)
>> >>    - Wired interrupt controller
>> >>    - In MSI-mode, converts wired interrupt into MSIs (i.e. MSI generator)
>> >>    - In Direct-mode, injects external interrupts directly into HARTs
>> >>
>> >> For an overview of the AIA specification, refer the AIA virtualization
>> >> talk at KVM Forum 2022:
>> >> https://static.sched.com/hosted_files/kvmforum2022/a1/AIA_Virtualization_in_KVM_RISCV_final.pdf
>> >> https://www.youtube.com/watch?v=r071dL8Z0yo
>> >>
>> >> To test this series, use QEMU v7.2 (or higher) and OpenSBI v1.2 (or higher).
>> >>
>> >> These patches can also be found in the riscv_aia_v12 branch at:
>> >> https://github.com/avpatel/linux.git
>> >>
>> >> Changes since v11:
>> >>  - Rebased on Linux-6.8-rc1
>> >>  - Included kernel/irq related patches from "genirq, irqchip: Convert ARM
>> >>    MSI handling to per device MSI domains" series by Thomas.
>> >>    (PATCH7, PATCH8, PATCH9, PATCH14, PATCH16, PATCH17, PATCH18, PATCH19,
>> >>     PATCH20, PATCH21, PATCH22, PATCH23, and PATCH32 of
>> >>     https://lore.kernel.org/linux-arm-kernel/20221121135653.208611233@linutronix.de/)
>> >>  - Updated APLIC MSI-mode driver to use the new WIRED_TO_MSI mechanism.
>> >>  - Updated IMSIC driver to support per-device MSI domains for PCI and
>> >>    platform devices.
>> >
>> > Thanks for working on this, Anup! I'm still reviewing the patches.
>> >
>> > I'm hitting a boot hang in text patching, with this series applied on
>> > 6.8-rc2. IPI issues?
>>
>> Not text patching! One cpu spinning in smp_call_function_many_cond() and
>> the others are in cpu_relax(). Smells like IPI...
>
> Can you share the complete bootlog ?

Here: https://gist.github.com/bjoto/04a580568378f3b5483af07cd9d22501