linux-kernel - Re: RISC-V irqchip drivers

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Date:   Wed, 25 Jul 2018 14:26:38 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Christoph Hellwig <hch@....de>
CC:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        shorne@...il.com
Subject:     Re: RISC-V irqchip drivers

On Wed, 25 Jul 2018 02:36:43 PDT (-0700), Christoph Hellwig wrote:
> The RISC-V ISA mandantes the presence of a simple, per-hart (hardware
> thread) interrupt controller availiable to supervisor mode.  In addition
> the RISC-V specification contains the definition of a programmable
> interrupt controller that is present on all current RISC-V cores (at
> least as far as a I know).
>
> This series adds both of them.  For the per-hart controller this series
> tries to address all comments vs the last posting from Palmr in June,
> and for the PLIC it has a lot of cleanups which I think should address
> all outstanding comments, but it has been a while since it was last
> posted.
>
> Without these irqchip drivers the RISC-V port in mainline is rather
> useless as it can't boot on any SOC or emulator.  With it it still is
> almost as useless as a clocksource driver is still missing, but at least
> we're only a patch or two away from a booting system, and the
> clocksource  driver will need the per-hart interrupt driver to work as
> well.
>
> Palmer: I assume you are ok with me pushing this forward.  If not I'll
> happily drop this series.

Thanks for taking this over, and sorry I've dropped the ball a bit here -- 
there's just a bit too much to do!

> A git tree with the patches in this series, the missing clocksource
> driver a few pending patches to allow booting a RISC-V kernel in qemu
> is available here:
>
>     git://git.infradead.org/users/hch/riscv.git riscv-linux-4.18
>
> Gitweb:
>
>     http://git.infradead.org/users/hch/riscv.git/shortlog/refs/heads/riscv-linux-4.18