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authorColin Cross <ccross@android.com>2012-05-07 17:57:42 -0700
committerLen Brown <len.brown@intel.com>2012-06-02 00:49:36 -0400
commit20ff51a36b2cd25ee7eb3216b6d02b68935435ba (patch)
tree3c50651ca3cdc64c409afe9f867c13a8d50200e0 /include
parent4126c0197bc8c58a0bb7fcda07b01b596b6fb4c5 (diff)
downloadop-kernel-dev-20ff51a36b2cd25ee7eb3216b6d02b68935435ba.zip
op-kernel-dev-20ff51a36b2cd25ee7eb3216b6d02b68935435ba.tar.gz
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: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpuidle.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 6038448..5ab7183 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -183,6 +183,10 @@ static inline int cpuidle_play_dead(void) {return -ENODEV; }
#endif
+#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
+void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a);
+#endif
+
/******************************
* CPUIDLE GOVERNOR INTERFACE *
******************************/
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