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The newly introduced Energy Model framework manages power cost tables in a generic way. Moreover, it supports several types of models since the tables can come from DT or firmware (through SCMI) for example. On the other hand, the cpu_cooling subsystem manages its own power cost tables using only DT data. In order to avoid the duplication of data in the kernel, and in order to enable IPA with EMs coming from more than just DT, remove the private tables from cpu_cooling.c and migrate it to using the centralized EM framework. Doing so should have no visible functional impact for existing users of IPA since: - recent extenstions to the the PM_OPP infrastructure enable the registration of EMs in PM_EM using the DT property used by IPA; - the existing upstream cpufreq drivers marked with the 'CPUFREQ_IS_COOLING_DEV' flag all use the aforementioned PM_OPP infrastructure, which means they all support PM_EM. The only two exceptions are qoriq-cpufreq which doesn't in fact use an EM and scmi-cpufreq which doesn't use DT for power costs. For existing users of cpu_cooling, PM_EM tables will contain the exact same power values that IPA used to compute on its own until now. The only new dependency for them is to compile in CONFIG_ENERGY_MODEL. The case where the thermal subsystem is used without an Energy Model (cpufreq_cooling_ops) is handled by looking directly at CPUFreq's frequency table which is already a dependency for cpu_cooling.c anyway. Since the thermal framework expects the cooling states in a particular order, bail out whenever the CPUFreq table is unsorted, since that is fairly uncommon in general, and there are currently no users of cpu_cooling for this use-case. Change-Id: Id29137bab348d4265b866ce87a00c59e46841d13 Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Quentin Perret <quentin.perret@arm.com> Message-Id: <20190530092038.12020-4-quentin.perret@arm.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.