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2eb2608618
Implement the callbacks required for an NBCON console [0] on the amba-pl011 console driver. Referred to the NBCON implementation work for 8250 [1] and imx [2]. The normal-priority write_thread checks for console ownership each time a character is printed. write_atomic holds the console ownership until the entire string is printed. UART register operations are protected from other contexts by uart_port_lock, except for a final flush(nbcon_atomic_flush_unsafe) on panic. The patch has been verified to correctly handle the output and competition of messages with different priorities and flushing panic message to console after nmi panic using ARM64 QEMU and a physical machine(A64FX). Stress testing was conducted on a physical machine(A64FX). The results are as follows: - The output speed and volume of messages using the NBCON console were comparable to the legacy console (data suggests a slight improvement). - When inducing a panic (sysrq-triggered or NMI) under heavy contention on the serial console output, the legacy console resulted in the loss of some or all crash messages. However, using the NBCON console, no message loss occurred. This testing referenced the NBCON console work for 8250 [3]. [0] https://lore.kernel.org/all/ZuRRTbapH0DCj334@pathway.suse.cz/ [1] https://lore.kernel.org/all/20240913140538.221708-1-john.ogness@linutronix.de/T/ [2] https://lore.kernel.org/linux-arm-kernel/20240913-serial-imx-nbcon-v3-1-4c627302335b@geanix.com/T/ [3] https://lore.kernel.org/lkml/ZsdoD6PomBRsB-ow@debarbos-thinkpadt14sgen2i.remote.csb/#t Signed-off-by: Toshiyuki Sato <fj6611ie@aa.jp.fujitsu.com> Link: https://lore.kernel.org/r/20250204044428.2191983-1-fj6611ie@aa.jp.fujitsu.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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 reStructuredText 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.