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The RISC-V PLIC specification unfortunately allows PLIC implementations to ignore edges seen while an edge-triggered interrupt is being handled: Depending on the design of the device and the interrupt handler, in between sending an interrupt request and receiving notice of its handler’s completion, the gateway might either ignore additional matching edges or increment a counter of pending interrupts. Like the NCEPLIC100, the T-HEAD C900 PLIC also has this behavior. Thus it also needs to inform software about each interrupt's trigger type, so the driver can use the right interrupt flow. Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220630100241.35233-4-samuel@sholland.org
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.