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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * poll_state.c - Polling idle state
- */
- #include <linux/cpuidle.h>
- #include <linux/sched.h>
- #include <linux/sched/clock.h>
- #include <linux/sched/idle.h>
- #define POLL_IDLE_RELAX_COUNT 200
- static int __cpuidle poll_idle(struct cpuidle_device *dev,
- struct cpuidle_driver *drv, int index)
- {
- u64 time_start = local_clock();
- dev->poll_time_limit = false;
- local_irq_enable();
- if (!current_set_polling_and_test()) {
- unsigned int loop_count = 0;
- u64 limit;
- limit = cpuidle_poll_time(drv, dev);
- while (!need_resched()) {
- cpu_relax();
- if (loop_count++ < POLL_IDLE_RELAX_COUNT)
- continue;
- loop_count = 0;
- if (local_clock() - time_start > limit) {
- dev->poll_time_limit = true;
- break;
- }
- }
- }
- 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->exit_latency_ns = 0;
- state->target_residency_ns = 0;
- state->power_usage = -1;
- state->enter = poll_idle;
- state->flags = CPUIDLE_FLAG_POLLING;
- }
- EXPORT_SYMBOL_GPL(cpuidle_poll_state_init);
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