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path: root/drivers/cpuidle/poll_state.c
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Diffstat (limited to 'drivers/cpuidle/poll_state.c')
-rw-r--r--drivers/cpuidle/poll_state.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c
new file mode 100644
index 000000000000..7416b16287de
--- /dev/null
+++ b/drivers/cpuidle/poll_state.c
@@ -0,0 +1,37 @@
+/*
+ * poll_state.c - Polling idle state
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/cpuidle.h>
+#include <linux/sched.h>
+#include <linux/sched/idle.h>
+
+static int __cpuidle poll_idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ local_irq_enable();
+ if (!current_set_polling_and_test()) {
+ while (!need_resched())
+ cpu_relax();
+ }
+ current_clr_polling();
+
+ return index;
+}
+
+void cpuidle_poll_state_init(struct cpuidle_driver *drv)
+{
+ struct cpuidle_state *state = &drv->states[0];
+
+ snprintf(state->name, CPUIDLE_NAME_LEN, "POLL");
+ snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
+ state->exit_latency = 0;
+ state->target_residency = 0;
+ state->power_usage = -1;
+ state->enter = poll_idle;
+ state->disabled = false;
+ state->flags = CPUIDLE_FLAG_POLLING;
+}
+EXPORT_SYMBOL_GPL(cpuidle_poll_state_init);