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Srinivas Pandruvada authored
In some use cases, it is desirable to only inject idle on certain set of CPUs. For example on Alder Lake systems, it is possible that we force idle only on P-Cores for thermal reasons. Also the idle percent can be more than 50% if we only choose partial set of CPUs in the system. Introduce 2 new module parameters for this purpose. They can be only changed when the cooling device is inactive. cpumask (Read/Write): A bit mask of CPUs to inject idle. The format of this bitmask is same as used in other subsystems like in /proc/irq/*/smp_affinity. The mask is comma separated 32 bit groups. Each CPU is one bit. For example for 256 CPU system the full mask is: ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff The rightmost mask is for CPU 0-32. max_idle (Read/Write): Maximum injected idle time to the total CPU time ratio in percent range from 1 to 100. Even if the cooling device max_state is always 100 (100%), this parameter allows to add a max idle percent limit. The default is 50, to match the current implementation of powerclamp driver. Also doesn't allow value more than 75, if the cpumask includes every CPU present in the system. Also when the cpumask doesn't include every CPU, there is no use of compensation using package C-state idle counters. Hence don't start package C-state polling thread even for a single package or a single die system in this case. Signed-off-by:
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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