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GIC700 erratum 2941627 may cause GIC-700 missing SPIs wake requests when SPIs are deactivated while targeting a sleeping CPU - ie a CPU for which the redistributor: GICR_WAKER.ProcessorSleep == 1 This runtime situation can happen if an SPI that has been activated on a core is retargeted to a different core, it becomes pending and the target core subsequently enters a power state quiescing the respective redistributor. When this situation is hit, the de-activation carried out on the core that activated the SPI (through either ICC_EOIR1_EL1 or ICC_DIR_EL1 register writes) does not trigger a wake requests for the sleeping GIC redistributor even if the SPI is pending. Work around the erratum by de-activating the SPI using the redistributor GICD_ICACTIVER register if the runtime conditions require it (ie the IRQ was retargeted between activation and de-activation). Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230704155034.148262-1-lpieralisi@kernel.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.