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

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Message-ID: <CAK9=C2U2mGzTLaXDqyD86bEM4XRc3UmBxRtrd3=+QXXwMK3hjg@mail.gmail.com>
Date: Tue, 30 Jan 2024 15:32:21 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Björn Töpel <bjorn@...nel.org>
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

On Tue, Jan 30, 2024 at 1:22 PM Björn Töpel <bjorn@...nelorg> 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 ?

Regards,
Anup