cpuidle: coupled: add parallel barrier function
Adds cpuidle_coupled_parallel_barrier, which can be used by coupled cpuidle state enter functions to handle resynchronization after determining if any cpu needs to abort. The normal use case will be: static bool abort_flag; static atomic_t abort_barrier; int arch_cpuidle_enter(struct cpuidle_device *dev, ...) { if (arch_turn_off_irq_controller()) { /* returns an error if an irq is pending and would be lost if idle continued and turned off power */ abort_flag = true; } cpuidle_coupled_parallel_barrier(dev, &abort_barrier); if (abort_flag) { /* One of the cpus didn't turn off it's irq controller */ arch_turn_on_irq_controller(); return -EINTR; } /* continue with idle */ ... } This will cause all cpus to abort idle together if one of them needs to abort. Reviewed-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: NKevin Hilman <khilman@ti.com> Tested-by: NKevin Hilman <khilman@ti.com> Signed-off-by: NColin Cross <ccross@android.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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