1 /* 2 * poll_state.c - Polling idle state 3 * 4 * This file is released under the GPLv2. 5 */ 6 7 #include <linux/cpuidle.h> 8 #include <linux/sched.h> 9 #include <linux/sched/idle.h> 10 11 static int __cpuidle poll_idle(struct cpuidle_device *dev, 12 struct cpuidle_driver *drv, int index) 13 { 14 local_irq_enable(); 15 if (!current_set_polling_and_test()) { 16 while (!need_resched()) 17 cpu_relax(); 18 } 19 current_clr_polling(); 20 21 return index; 22 } 23 24 void cpuidle_poll_state_init(struct cpuidle_driver *drv) 25 { 26 struct cpuidle_state *state = &drv->states[0]; 27 28 snprintf(state->name, CPUIDLE_NAME_LEN, "POLL"); 29 snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); 30 state->exit_latency = 0; 31 state->target_residency = 0; 32 state->power_usage = -1; 33 state->enter = poll_idle; 34 state->disabled = false; 35 state->flags = CPUIDLE_FLAG_POLLING; 36 } 37 EXPORT_SYMBOL_GPL(cpuidle_poll_state_init); 38