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References: <20240127161753.114685-1-apatel@ventanamicro.com>
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In-Reply-To: <87le87uulb.fsf@all.your.base.are.belong.to.us>
From: Anup Patel <apatel@ventanamicro.com>
Date: Tue, 30 Jan 2024 15:32:21 +0530
Message-ID: <CAK9=C2U2mGzTLaXDqyD86bEM4XRc3UmBxRtrd3=+QXXwMK3hjg@mail.gmail.com>
Subject: Re: [PATCH v12 00/25] Linux RISC-V AIA Support
To: =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, 
	Thomas Gleixner <tglx@linutronix.de>, Rob Herring <robh+dt@kernel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Frank Rowand <frowand.list@gmail.com>, 
	Conor Dooley <conor+dt@kernel.org>, devicetree@vger.kernel.org, 
	Saravana Kannan <saravanak@google.com>, Marc Zyngier <maz@kernel.org>, Anup Patel <anup@brainfault.org>, 
	linux-kernel@vger.kernel.org, Atish Patra <atishp@atishpatra.org>, 
	linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, 
	Andrew Jones <ajones@ventanamicro.com>
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On Tue, Jan 30, 2024 at 1:22=E2=80=AFPM Bj=C3=B6rn T=C3=B6pel <bjorn@kernel=
org> wrote:
>
> Bj=C3=B6rn T=C3=B6pel <bjorn@kernel.org> writes:
>
> > Anup Patel <apatel@ventanamicro.com> writes:
> >
> >> The RISC-V AIA specification is ratified as-per the RISC-V internation=
al
> >> process. The latest ratified AIA specifcation can be found at:
> >> https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interru=
pts-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 generat=
or)
> >>    - 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_Virtualizati=
on_in_KVM_RISCV_final.pdf
> >> https://www.youtube.com/watch?v=3Dr071dL8Z0yo
> >>
> >> To test this series, use QEMU v7.2 (or higher) and OpenSBI v1.2 (or hi=
gher).
> >>
> >> 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, PATCH1=
9,
> >>     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