1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2015 Intel Corporation
3 */
4
5
6 #ifndef LTHREAD_TIMER_H_
7 #define LTHREAD_TIMER_H_
8
9 #ifdef __cplusplus
10 extern "C" {
11 #endif
12
13 #include "lthread_int.h"
14 #include "lthread_sched.h"
15
16
17 static inline uint64_t
_ns_to_clks(uint64_t ns)18 _ns_to_clks(uint64_t ns)
19 {
20 /*
21 * clkns needs to be divided by 1E9 to get ns clocks. However,
22 * dividing by this first would lose a lot of accuracy.
23 * Dividing after a multiply by ns, could cause overflow of
24 * uint64_t if ns is about 5 seconds [if we assume a max tsc
25 * rate of 4GHz]. Therefore we first divide by 1E4, then
26 * multiply and finally divide by 1E5. This allows ns to be
27 * values many hours long, without overflow, while still keeping
28 * reasonable accuracy.
29 */
30 uint64_t clkns = rte_get_tsc_hz() / 1e4;
31
32 clkns *= ns;
33 clkns /= 1e5;
34
35 return clkns;
36 }
37
38
39 static inline void
_timer_start(struct lthread * lt,uint64_t clks)40 _timer_start(struct lthread *lt, uint64_t clks)
41 {
42 if (clks > 0) {
43 DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_START, <->tim, clks);
44 rte_timer_init(<->tim);
45 rte_timer_reset(<->tim,
46 clks,
47 SINGLE,
48 rte_lcore_id(),
49 _sched_timer_cb,
50 (void *)lt);
51 }
52 }
53
54
55 static inline void
_timer_stop(struct lthread * lt)56 _timer_stop(struct lthread *lt)
57 {
58 if (lt != NULL) {
59 DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_DELETE, <->tim, 0);
60 rte_timer_stop(<->tim);
61 }
62 }
63
64 #ifdef __cplusplus
65 }
66 #endif
67
68 #endif /* LTHREAD_TIMER_H_ */
69