linux-kernel - RFC: simplified RISC-V interrupt and clocksource handling

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Message-Id: <20180726143723.16585-1-hch@lst.de>
Date:   Thu, 26 Jul 2018 16:37:14 +0200
From:   Christoph Hellwig <hch@....de>
To:     tglx@...utronix.de, palmer@...ive.com, jason@...edaemon.net,
        marc.zyngier@....com, robh+dt@...nel.org, mark.rutland@....com
Cc:     anup@...infault.org, atish.patra@....com,
        devicetree@...r.kernel.org, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        shorne@...il.com
Subject: RFC: simplified RISC-V interrupt and clocksource handling

This series tries adds support for interrupt handling and timers
for the RISC-V architecture.

The basic per-hart interrupt handling implemented by the scause
and sie CSRs is extremely simple and implemented directly in
arch/riscv/kernel/irq.c.  In addition there is a irqchip driver
for the PLIC external interrupt controller, which is called through
the set_handle_irq API, and a clocksource driver that gets its
timer interrupt directly from the low-level interrupt handling.

Compared to previous iterations this version does not try to use an
irqchip driver for the low-level interrupt handling.  This saves
a couple indirect calls and an additional read of the scause CSR
in the hot path, makes the code much simpler and last but not least
avoid the dependency on a device tree for a mandatory architectural
feature.

A git tree is available here (contains a few more patches before
the ones in this series)

    git://git.infradead.org/users/hch/riscv.git riscv-irq-simple

Gitweb:

    http://git.infradead.org/users/hch/riscv.git/shortlog/refs/heads/riscv-irq-simple