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7ba791b2a7
In general it makes not sense to hotplug out all the CPUs of a system, thus ususally CPU0 is configured as not hot/plugggable. Definitively, on a single core system it does not make sense to hotpolug out the only available CPU. This patch switch to usage of CPU1 for hotplug support probing, which is the really first one for which enabling hotplug could be useful. Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
from devlib.module import Module
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class HotplugModule(Module):
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name = 'hotplug'
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base_path = '/sys/devices/system/cpu'
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@classmethod
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def probe(cls, target): # pylint: disable=arguments-differ
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# If a system has just 1 CPU, it makes not sense to hotplug it.
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# If a system has more than 1 CPU, CPU0 could be configured to be not
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# hotpluggable. Thus, check for hotplug support by looking at CPU1
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path = cls._cpu_path(target, 1)
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return target.file_exists(path) and target.is_rooted
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@classmethod
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def _cpu_path(cls, target, cpu):
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if isinstance(cpu, int):
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cpu = 'cpu{}'.format(cpu)
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return target.path.join(cls.base_path, cpu, 'online')
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def online_all(self):
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self.online(*range(self.target.number_of_cpus))
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def online(self, *args):
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for cpu in args:
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self.hotplug(cpu, online=True)
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def offline(self, *args):
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for cpu in args:
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self.hotplug(cpu, online=False)
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def hotplug(self, cpu, online):
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path = self._cpu_path(self.target, cpu)
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if not self.target.file_exists(path):
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return
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value = 1 if online else 0
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self.target.write_value(path, value)
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