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When hardware wants to inform the operating system about updates in the HFI table, it issues a package-level thermal event interrupt. For this, hardware has new interrupt and status bits in the IA32_PACKAGE_THERM_ INTERRUPT and IA32_PACKAGE_THERM_STATUS registers. The existing thermal throttle driver already handles thermal event interrupts: it initializes the thermal vector of the local APIC as well as per-CPU and package-level interrupt reporting. It also provides routines to service such interrupts. Extend its functionality to also handle HFI interrupts. The frequency of the thermal HFI interrupt is specific to each processor model. On some processors, a single interrupt happens as soon as the HFI is enabled and hardware will never update HFI capabilities afterwards. On other processors, thermal and power constraints may cause thermal HFI interrupts every tens of milliseconds. To not overwhelm consumers of the HFI data, use delayed work to throttle the rate at which HFI updates are processed. Use a dedicated workqueue to not overload system_wq if hardware issues many HFI updates. Reviewed-by: Len Brown <len.brown@intel.com> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@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.