mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
ba1e78a1dc
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>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
// 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);
|