FD.io VPP  v18.07-rc0-415-g6c78436
Vector Packet Processing
time.h
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
17 
18  Permission is hereby granted, free of charge, to any person obtaining
19  a copy of this software and associated documentation files (the
20  "Software"), to deal in the Software without restriction, including
21  without limitation the rights to use, copy, modify, merge, publish,
22  distribute, sublicense, and/or sell copies of the Software, and to
23  permit persons to whom the Software is furnished to do so, subject to
24  the following conditions:
25 
26  The above copyright notice and this permission notice shall be
27  included in all copies or substantial portions of the Software.
28 
29  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 */
37 
38 #ifndef included_time_h
39 #define included_time_h
40 
41 #include <vppinfra/clib.h>
42 
43 typedef struct
44 {
45  /* Total run time in clock cycles
46  since clib_time_init call. */
48 
49  /* Last recorded time stamp. */
51 
52  /* CPU clock frequency. */
54 
55  /* 1 / cpu clock frequency: conversion factor
56  from clock cycles into seconds. */
58 
59  /* Time stamp of call to clib_time_init call. */
61 
63 
64  /* Same but for reference time (if present). */
66 
67  u32 log2_clocks_per_second, log2_clocks_per_frequency_verify;
68 } clib_time_t;
69 
70 /* Return CPU time stamp as 64bit number. */
71 #if defined(__x86_64__) || defined(i386)
74 {
75  u32 a, d;
76  asm volatile ("rdtsc":"=a" (a), "=d" (d));
77  return (u64) a + ((u64) d << (u64) 32);
78 }
79 
80 #elif defined (__powerpc64__)
81 
83 clib_cpu_time_now (void)
84 {
85  u64 t;
86  asm volatile ("mftb %0":"=r" (t));
87  return t;
88 }
89 
90 #elif defined (__SPU__)
91 
93 clib_cpu_time_now (void)
94 {
95 #ifdef _XLC
96  return spu_rdch (0x8);
97 #else
98  return 0 /* __builtin_si_rdch (0x8) FIXME */ ;
99 #endif
100 }
101 
102 #elif defined (__powerpc__)
103 
105 clib_cpu_time_now (void)
106 {
107  u32 hi1, hi2, lo;
108  asm volatile ("1:\n"
109  "mftbu %[hi1]\n"
110  "mftb %[lo]\n"
111  "mftbu %[hi2]\n"
112  "cmpw %[hi1],%[hi2]\n"
113  "bne 1b\n":[hi1] "=r" (hi1),[hi2] "=r" (hi2),[lo] "=r" (lo));
114  return (u64) lo + ((u64) hi2 << (u64) 32);
115 }
116 
117 #elif defined (__aarch64__)
119 clib_cpu_time_now (void)
120 {
121  u64 vct;
122  /* User access to cntvct_el0 is enabled in Linux kernel since 3.12. */
123  asm volatile ("mrs %0, cntvct_el0":"=r" (vct));
124  return vct;
125 }
126 
127 #elif defined (__arm__)
128 #if defined(__ARM_ARCH_8A__)
130 clib_cpu_time_now (void) /* We may run arm64 in aarch32 mode, to leverage 64bit counter */
131 {
132  u64 tsc;
133  asm volatile ("mrrc p15, 0, %Q0, %R0, c9":"=r" (tsc));
134  return tsc;
135 }
136 #elif defined(__ARM_ARCH_7A__)
138 clib_cpu_time_now (void)
139 {
140  u32 tsc;
141  asm volatile ("mrc p15, 0, %0, c9, c13, 0":"=r" (tsc));
142  return (u64) tsc;
143 }
144 #else
146 clib_cpu_time_now (void)
147 {
148  u32 lo;
149  asm volatile ("mrc p15, 0, %[lo], c15, c12, 1":[lo] "=r" (lo));
150  return (u64) lo;
151 }
152 #endif
153 
154 #elif defined (__xtensa__)
155 
156 /* Stub for now. */
158 clib_cpu_time_now (void)
159 {
160  return 0;
161 }
162 
163 #elif defined (__TMS320C6X__)
164 
166 clib_cpu_time_now (void)
167 {
168  u32 l, h;
169 
170  asm volatile (" dint\n"
171  " mvc .s2 TSCL,%0\n"
172  " mvc .s2 TSCH,%1\n" " rint\n":"=b" (l), "=b" (h));
173 
174  return ((u64) h << 32) | l;
175 }
176 
177 #else
178 #error "don't know how to read CPU time stamp"
179 
180 #endif
181 
183 
186 {
187  u64 l = c->last_cpu_time;
188  u64 t = c->total_cpu_time;
189  t += n - l;
190  c->total_cpu_time = t;
191  c->last_cpu_time = n;
192  if (PREDICT_FALSE
193  ((c->last_cpu_time -
196  return t * c->seconds_per_clock;
197 }
198 
199 /* Maximum f64 value as max clib_time */
200 #define CLIB_TIME_MAX (1.7976931348623157e+308)
201 
204 {
206 }
207 
208 always_inline void
210 {
211  u64 t_end = clib_cpu_time_now () + dt;
212  while (clib_cpu_time_now () < t_end)
213  ;
214 }
215 
216 void clib_time_init (clib_time_t * c);
217 
218 #ifdef CLIB_UNIX
219 
220 #include <time.h>
221 #include <sys/time.h>
222 #include <sys/resource.h>
223 #include <unistd.h>
224 #include <sys/syscall.h>
225 
226 /* Use 64bit floating point to represent time offset from epoch. */
229 {
230  /* clock_gettime without indirect syscall uses GLIBC wrappers which
231  we don't want. Just the bare metal, please. */
232  struct timespec ts;
233  syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
234  return ts.tv_sec + 1e-9 * ts.tv_nsec;
235 }
236 
237 /* As above but integer number of nano-seconds. */
240 {
241  struct timespec ts;
242  syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
243  return 1e9 * ts.tv_sec + ts.tv_nsec;
244 }
245 
246 always_inline void
248 {
249  struct timespec ts;
250  syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
251  *sec = ts.tv_sec;
252  *nsec = ts.tv_nsec;
253 }
254 
257 {
258  struct rusage u;
259  getrusage (RUSAGE_SELF, &u);
260  return u.ru_utime.tv_sec + 1e-6 * u.ru_utime.tv_usec
261  + u.ru_stime.tv_sec + 1e-6 * u.ru_stime.tv_usec;
262 }
263 
264 always_inline void
266 {
267  struct timespec ts, tsrem;
268  ts.tv_sec = dt;
269  ts.tv_nsec = 1e9 * (dt - (f64) ts.tv_sec);
270 
271  while (nanosleep (&ts, &tsrem) < 0)
272  ts = tsrem;
273 }
274 
275 #else /* ! CLIB_UNIX */
276 
278 unix_time_now (void)
279 {
280  return 0;
281 }
282 
284 unix_time_now_nsec (void)
285 {
286  return 0;
287 }
288 
289 always_inline void
290 unix_time_now_nsec_fraction (u32 * sec, u32 * nsec)
291 {
292 }
293 
295 unix_usage_now (void)
296 {
297  return 0;
298 }
299 
300 always_inline void
301 unix_sleep (f64 dt)
302 {
303 }
304 
305 #endif
306 
307 #endif /* included_time_h */
308 
309 /*
310  * fd.io coding-style-patch-verification: ON
311  *
312  * Local Variables:
313  * eval: (c-set-style "gnu")
314  * End:
315  */
a
Definition: bitmap.h:537
static void clib_cpu_time_wait(u64 dt)
Definition: time.h:209
unsigned long u64
Definition: types.h:89
void clib_time_verify_frequency(clib_time_t *c)
Definition: time.c:194
f64 clocks_per_second
Definition: time.h:53
static f64 clib_time_now(clib_time_t *c)
Definition: time.h:203
static u64 clib_cpu_time_now(void)
Definition: time.h:73
u32 log2_clocks_per_second
Definition: time.h:67
u64 last_verify_cpu_time
Definition: time.h:62
double f64
Definition: types.h:142
static void unix_sleep(f64 dt)
Definition: time.h:265
#define always_inline
Definition: clib.h:92
static f64 unix_time_now(void)
Definition: time.h:228
unsigned int u32
Definition: types.h:88
static void unix_time_now_nsec_fraction(u32 *sec, u32 *nsec)
Definition: time.h:247
lo
u32 log2_clocks_per_frequency_verify
Definition: time.h:67
#define PREDICT_FALSE(x)
Definition: clib.h:105
f64 seconds_per_clock
Definition: time.h:57
u64 total_cpu_time
Definition: time.h:47
static u64 unix_time_now_nsec(void)
Definition: time.h:239
static f64 unix_usage_now(void)
Definition: time.h:256
u64 last_cpu_time
Definition: time.h:50
f64 last_verify_reference_time
Definition: time.h:65
static f64 clib_time_now_internal(clib_time_t *c, u64 n)
Definition: time.h:185
u64 init_cpu_time
Definition: time.h:60
void clib_time_init(clib_time_t *c)
Definition: time.c:178