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hotplug: make hotplug probing more robust

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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>
This commit is contained in:
Patrick Bellasi 2015-09-15 10:21:25 +01:00
parent 4e6afe960b
commit 7ba791b2a7
1 changed files with 6 additions and 1 deletions
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7
devlib/module/hotplug.py
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@ -8,7 +8,10 @@ class HotplugModule(Module):
@classmethod
def probe(cls, target): # pylint: disable=arguments-differ
path = cls._cpu_path(target, 0)
# If a system has just 1 CPU, it makes not sense to hotplug it.
# If a system has more than 1 CPU, CPU0 could be configured to be not
# hotpluggable. Thus, check for hotplug support by looking at CPU1
path = cls._cpu_path(target, 1)
return target.file_exists(path) and target.is_rooted
@classmethod
@ -30,6 +33,8 @@ class HotplugModule(Module):
def hotplug(self, cpu, online):
path = self._cpu_path(self.target, cpu)
if not self.target.file_exists(path):
return
value = 1 if online else 0
self.target.write_value(path, value)