1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2015 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 35 #ifndef LTHREAD_TIMER_H_ 36 #define LTHREAD_TIMER_H_ 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 #include "lthread_int.h" 43 #include "lthread_sched.h" 44 45 46 static inline uint64_t 47 _ns_to_clks(uint64_t ns) 48 { 49 /* 50 * clkns needs to be divided by 1E9 to get ns clocks. However, 51 * dividing by this first would lose a lot of accuracy. 52 * Dividing after a multiply by ns, could cause overflow of 53 * uint64_t if ns is about 5 seconds [if we assume a max tsc 54 * rate of 4GHz]. Therefore we first divide by 1E4, then 55 * multiply and finally divide by 1E5. This allows ns to be 56 * values many hours long, without overflow, while still keeping 57 * reasonable accuracy. 58 */ 59 uint64_t clkns = rte_get_tsc_hz() / 1e4; 60 61 clkns *= ns; 62 clkns /= 1e5; 63 64 return clkns; 65 } 66 67 68 static inline void 69 _timer_start(struct lthread *lt, uint64_t clks) 70 { 71 if (clks > 0) { 72 DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_START, <->tim, clks); 73 rte_timer_init(<->tim); 74 rte_timer_reset(<->tim, 75 clks, 76 SINGLE, 77 rte_lcore_id(), 78 _sched_timer_cb, 79 (void *)lt); 80 } 81 } 82 83 84 static inline void 85 _timer_stop(struct lthread *lt) 86 { 87 if (lt != NULL) { 88 DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_DELETE, <->tim, 0); 89 rte_timer_stop(<->tim); 90 } 91 } 92 93 #ifdef __cplusplus 94 } 95 #endif 96 97 #endif /* LTHREAD_TIMER_H_ */ 98