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cpuidle-haltpoll: vcpu hotplug support

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When cpus != maxcpus cpuidle-haltpoll will fail to register all vcpus
past the online ones and thus fail to register the idle driver.
This is because cpuidle_add_sysfs() will return with -ENODEV as a
consequence from get_cpu_device() return no device for a non-existing
CPU.

Instead switch to cpuidle_register_driver() and manually register each
of the present cpus through cpuhp_setup_state() callbacks and future
ones that get onlined or offlined. This mimmics similar logic that
intel_idle does.

Fixes: fa86ee90eb ("add cpuidle-haltpoll driver")
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Joao Martins
2019-09-02 11:40:31 +01:00
committed by Rafael J. Wysocki
parent b7e7fffd3e
commit 97d3eb9da8
4 changed files with 73 additions and 21 deletions
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4
include/linux/cpuidle_haltpoll.h
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@@ -5,11 +5,11 @@
#ifdef CONFIG_ARCH_CPUIDLE_HALTPOLL
#include <asm/cpuidle_haltpoll.h>
#else
static inline void arch_haltpoll_enable(void)
static inline void arch_haltpoll_enable(unsigned int cpu)
{
}
static inline void arch_haltpoll_disable(void)
static inline void arch_haltpoll_disable(unsigned int cpu)
{
}
#endif