Commit | Line | Data |
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34c2f65b RW |
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> | |
a37b969a | 9 | #include <linux/sched/clock.h> |
34c2f65b RW |
10 | #include <linux/sched/idle.h> |
11 | ||
4dc2375c | 12 | #define POLL_IDLE_RELAX_COUNT 200 |
a37b969a | 13 | |
34c2f65b RW |
14 | static int __cpuidle poll_idle(struct cpuidle_device *dev, |
15 | struct cpuidle_driver *drv, int index) | |
16 | { | |
a37b969a RW |
17 | u64 time_start = local_clock(); |
18 | ||
5f26bdce RW |
19 | dev->poll_time_limit = false; |
20 | ||
34c2f65b RW |
21 | local_irq_enable(); |
22 | if (!current_set_polling_and_test()) { | |
4dc2375c | 23 | unsigned int loop_count = 0; |
800fb34a RW |
24 | u64 limit = TICK_USEC; |
25 | int i; | |
26 | ||
27 | for (i = 1; i < drv->state_count; i++) { | |
28 | if (drv->states[i].disabled || dev->states_usage[i].disable) | |
29 | continue; | |
30 | ||
31 | limit = (u64)drv->states[i].target_residency * NSEC_PER_USEC; | |
32 | break; | |
33 | } | |
4dc2375c | 34 | |
a37b969a | 35 | while (!need_resched()) { |
34c2f65b | 36 | cpu_relax(); |
4dc2375c RW |
37 | if (loop_count++ < POLL_IDLE_RELAX_COUNT) |
38 | continue; | |
a37b969a | 39 | |
4dc2375c | 40 | loop_count = 0; |
01bad1c6 | 41 | if (local_clock() - time_start > limit) { |
5f26bdce | 42 | dev->poll_time_limit = true; |
a37b969a | 43 | break; |
5f26bdce | 44 | } |
a37b969a | 45 | } |
34c2f65b RW |
46 | } |
47 | current_clr_polling(); | |
48 | ||
49 | return index; | |
50 | } | |
51 | ||
1b39e3f8 | 52 | void cpuidle_poll_state_init(struct cpuidle_driver *drv) |
34c2f65b RW |
53 | { |
54 | struct cpuidle_state *state = &drv->states[0]; | |
55 | ||
56 | snprintf(state->name, CPUIDLE_NAME_LEN, "POLL"); | |
57 | snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); | |
58 | state->exit_latency = 0; | |
59 | state->target_residency = 0; | |
60 | state->power_usage = -1; | |
61 | state->enter = poll_idle; | |
62 | state->disabled = false; | |
63 | state->flags = CPUIDLE_FLAG_POLLING; | |
64 | } | |
1b39e3f8 | 65 | EXPORT_SYMBOL_GPL(cpuidle_poll_state_init); |