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The CPU measurement facility counter information instruction qctri() retrieves information about the available counter sets. The information varies between machine generations, but is constant when running on a particular machine. For example the CPU measurement facility counter first and second version numbers determine the amount of counters in a counter set. This information never changes. The counter sets are identical for all CPUs in the system. It does not matter which CPU performs the instruction. Authorization control of the CPU Measurement facility can only be changed in the activation profile while the LPAR is not running. Retrieve the CPU measurement counter information at device driver initialization time and use its constant values. Function validate_ctr_version() verifies if a user provided CPU Measurement counter facility counter is valid and defined. It now uses the newly introduced static CPU counter facility information. To avoid repeated recalculation of the counter set sizes (numbers of counters per set), which never changes on a running machine, calculate the counter set size once at device driver initialization and store the result in an array. Functions cpum_cf_make_setsize() and cpum_cf_read_setsize() are introduced. Finally remove cpu_cf_events::info member and use the static CPU counter facility information instead. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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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 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.