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After recent cpuidle updates the "disabled" field in struct cpuidle_state is only used by two drivers (intel_idle and shmobile cpuidle) for marking unusable idle states, but that may as well be achieved with the help of a state flag, so define an "unusable" idle state flag, CPUIDLE_FLAG_UNUSABLE, make the drivers in question use it instead of the "disabled" field and make the core set CPUIDLE_STATE_DISABLED_BY_DRIVER for the idle states with that flag set. After the above changes, the "disabled" field in struct cpuidle_state is not used any more, so drop it. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* poll_state.c - Polling idle state
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*/
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#include <linux/cpuidle.h>
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#include <linux/sched.h>
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#include <linux/sched/clock.h>
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#include <linux/sched/idle.h>
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#define POLL_IDLE_RELAX_COUNT 200
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static int __cpuidle poll_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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u64 time_start = local_clock();
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dev->poll_time_limit = false;
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local_irq_enable();
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if (!current_set_polling_and_test()) {
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unsigned int loop_count = 0;
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u64 limit;
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limit = cpuidle_poll_time(drv, dev);
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while (!need_resched()) {
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cpu_relax();
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if (loop_count++ < POLL_IDLE_RELAX_COUNT)
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continue;
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loop_count = 0;
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if (local_clock() - time_start > limit) {
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dev->poll_time_limit = true;
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break;
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}
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}
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}
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current_clr_polling();
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return index;
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}
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void cpuidle_poll_state_init(struct cpuidle_driver *drv)
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{
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struct cpuidle_state *state = &drv->states[0];
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snprintf(state->name, CPUIDLE_NAME_LEN, "POLL");
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snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
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state->exit_latency = 0;
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state->target_residency = 0;
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state->exit_latency_ns = 0;
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state->target_residency_ns = 0;
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state->power_usage = -1;
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state->enter = poll_idle;
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state->flags = CPUIDLE_FLAG_POLLING;
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}
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EXPORT_SYMBOL_GPL(cpuidle_poll_state_init);
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