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[ Upstream commit 1c53081d773c2cb4461636559b0d55b46559ceec ] In preparation to support hibernation, add functionality to disable an HFI instance during CPU offline. The last CPU of an instance that goes offline will disable such instance. The Intel Software Development Manual states that the operating system must wait for the hardware to set MSR_IA32_PACKAGE_THERM_STATUS[26] after disabling an HFI instance to ensure that it will no longer write on the HFI memory. Some processors, however, do not ever set such bit. Wait a minimum of 2ms to give time hardware to complete any pending memory writes. Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Stable-dep-of: 97566d09fd02 ("thermal: intel: hfi: Add syscore callbacks for system-wide PM") Signed-off-by: Sasha Levin <sashal@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.