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If GuC hits an internal error (and survives long enough to report it to the KMD), it is basically toast and will stop until a GT reset and subsequent GuC reload is performed. Previously, the KMD just printed an error message and then waited for the heartbeat to eventually kick in and trigger a reset (assuming the heartbeat had not been disabled). Instead, force the reset immediately to guarantee that it happens and to eliminate the very long heartbeat delay. The captured error state is also more likely to be useful if captured at the time of the error rather than many seconds later. Note that it is not possible to trigger a reset from with the G2H handler itself. The reset prepare process involves flushing outstanding G2H contents. So a deadlock could result. Instead, the G2H handler queues a worker thread to do the reset asynchronously. v2: Flush the worker on suspend and shutdown. Add rate limiting to prevent spam from a totally dead system (review feedback from Daniele). Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230816003957.3572654-1-John.C.Harrison@Intel.com
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.