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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /drivers/cpuidle/poll_state.c | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/cpuidle/poll_state.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c new file mode 100644 index 000000000..36ff5a1d9 --- /dev/null +++ b/drivers/cpuidle/poll_state.c @@ -0,0 +1,56 @@ +/* + * poll_state.c - Polling idle state + * + * This file is released under the GPLv2. + */ + +#include <linux/cpuidle.h> +#include <linux/sched.h> +#include <linux/sched/clock.h> +#include <linux/sched/idle.h> + +#define POLL_IDLE_TIME_LIMIT (TICK_NSEC / 16) +#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; + + while (!need_resched()) { + cpu_relax(); + if (loop_count++ < POLL_IDLE_RELAX_COUNT) + continue; + + loop_count = 0; + if (local_clock() - time_start > POLL_IDLE_TIME_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->power_usage = -1; + state->enter = poll_idle; + state->disabled = false; + state->flags = CPUIDLE_FLAG_POLLING; +} +EXPORT_SYMBOL_GPL(cpuidle_poll_state_init); |