1 | /*- |
---|
2 | * ---------------------------------------------------------------------------- |
---|
3 | * "THE BEER-WARE LICENSE" (Revision 42): |
---|
4 | * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you |
---|
5 | * can do whatever you want with this stuff. If we meet some day, and you think |
---|
6 | * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp |
---|
7 | * ---------------------------------------------------------------------------- |
---|
8 | * |
---|
9 | * Copyright (c) 2011 The FreeBSD Foundation |
---|
10 | * All rights reserved. |
---|
11 | * |
---|
12 | * Portions of this software were developed by Julien Ridoux at the University |
---|
13 | * of Melbourne under sponsorship from the FreeBSD Foundation. |
---|
14 | */ |
---|
15 | |
---|
16 | #ifdef __rtems__ |
---|
17 | #define _KERNEL |
---|
18 | #define binuptime(_bt) _Timecounter_Binuptime(_bt) |
---|
19 | #define nanouptime(_tsp) _Timecounter_Nanouptime(_tsp) |
---|
20 | #define microuptime(_tvp) _Timecounter_Microuptime(_tvp) |
---|
21 | #define bintime(_bt) _Timecounter_Bintime(_bt) |
---|
22 | #define nanotime(_tsp) _Timecounter_Nanotime(_tsp) |
---|
23 | #define microtime(_tvp) _Timecounter_Microtime(_tvp) |
---|
24 | #define getbinuptime(_bt) _Timecounter_Getbinuptime(_bt) |
---|
25 | #define getnanouptime(_tsp) _Timecounter_Getnanouptime(_tsp) |
---|
26 | #define getmicrouptime(_tvp) _Timecounter_Getmicrouptime(_tvp) |
---|
27 | #define getbintime(_bt) _Timecounter_Getbintime(_bt) |
---|
28 | #define getnanotime(_tsp) _Timecounter_Getnanotime(_tsp) |
---|
29 | #define getmicrotime(_tvp) _Timecounter_Getmicrotime(_tvp) |
---|
30 | #define tc_init _Timecounter_Install |
---|
31 | #define timecounter _Timecounter |
---|
32 | #define time_second _Timecounter_Time_second |
---|
33 | #define time_uptime _Timecounter_Time_uptime |
---|
34 | #define boottimebin _Timecounter_Boottimebin |
---|
35 | #include <rtems/score/timecounterimpl.h> |
---|
36 | #include <rtems/score/smp.h> |
---|
37 | #include <rtems/score/todimpl.h> |
---|
38 | #include <rtems/score/watchdogimpl.h> |
---|
39 | #endif /* __rtems__ */ |
---|
40 | #include <sys/cdefs.h> |
---|
41 | __FBSDID("$FreeBSD r284178 2015-06-09T11:49:56Z$"); |
---|
42 | |
---|
43 | #include "opt_compat.h" |
---|
44 | #include "opt_ntp.h" |
---|
45 | #include "opt_ffclock.h" |
---|
46 | |
---|
47 | #include <sys/param.h> |
---|
48 | #ifndef __rtems__ |
---|
49 | #include <sys/kernel.h> |
---|
50 | #include <sys/limits.h> |
---|
51 | #include <sys/lock.h> |
---|
52 | #include <sys/mutex.h> |
---|
53 | #include <sys/sbuf.h> |
---|
54 | #include <sys/sysctl.h> |
---|
55 | #include <sys/syslog.h> |
---|
56 | #include <sys/systm.h> |
---|
57 | #endif /* __rtems__ */ |
---|
58 | #include <sys/timeffc.h> |
---|
59 | #include <sys/timepps.h> |
---|
60 | #include <sys/timetc.h> |
---|
61 | #include <sys/timex.h> |
---|
62 | #ifndef __rtems__ |
---|
63 | #include <sys/vdso.h> |
---|
64 | #include <machine/atomic.h> |
---|
65 | #endif /* __rtems__ */ |
---|
66 | #ifdef __rtems__ |
---|
67 | #include <limits.h> |
---|
68 | #include <rtems.h> |
---|
69 | ISR_LOCK_DEFINE(, _Timecounter_Lock, "Timecounter") |
---|
70 | #define _Timecounter_Release(lock_context) \ |
---|
71 | _ISR_lock_Release_and_ISR_enable(&_Timecounter_Lock, lock_context) |
---|
72 | #define hz rtems_clock_get_ticks_per_second() |
---|
73 | #define printf(...) |
---|
74 | #define bcopy(x, y, z) memcpy(y, x, z); |
---|
75 | #define log(...) |
---|
76 | static inline int |
---|
77 | fls(int x) |
---|
78 | { |
---|
79 | return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; |
---|
80 | } |
---|
81 | /* FIXME: https://devel.rtems.org/ticket/2348 */ |
---|
82 | #define ntp_update_second(a, b) do { (void) a; (void) b; } while (0) |
---|
83 | #endif /* __rtems__ */ |
---|
84 | |
---|
85 | /* |
---|
86 | * A large step happens on boot. This constant detects such steps. |
---|
87 | * It is relatively small so that ntp_update_second gets called enough |
---|
88 | * in the typical 'missed a couple of seconds' case, but doesn't loop |
---|
89 | * forever when the time step is large. |
---|
90 | */ |
---|
91 | #define LARGE_STEP 200 |
---|
92 | |
---|
93 | /* |
---|
94 | * Implement a dummy timecounter which we can use until we get a real one |
---|
95 | * in the air. This allows the console and other early stuff to use |
---|
96 | * time services. |
---|
97 | */ |
---|
98 | |
---|
99 | static uint32_t |
---|
100 | dummy_get_timecount(struct timecounter *tc) |
---|
101 | { |
---|
102 | #ifndef __rtems__ |
---|
103 | static uint32_t now; |
---|
104 | |
---|
105 | return (++now); |
---|
106 | #else /* __rtems__ */ |
---|
107 | return 0; |
---|
108 | #endif /* __rtems__ */ |
---|
109 | } |
---|
110 | |
---|
111 | static struct timecounter dummy_timecounter = { |
---|
112 | dummy_get_timecount, 0, ~0u, 1000000, "dummy", -1000000 |
---|
113 | }; |
---|
114 | |
---|
115 | struct timehands { |
---|
116 | /* These fields must be initialized by the driver. */ |
---|
117 | struct timecounter *th_counter; |
---|
118 | int64_t th_adjustment; |
---|
119 | uint64_t th_scale; |
---|
120 | uint32_t th_offset_count; |
---|
121 | struct bintime th_offset; |
---|
122 | struct timeval th_microtime; |
---|
123 | struct timespec th_nanotime; |
---|
124 | /* Fields not to be copied in tc_windup start with th_generation. */ |
---|
125 | #ifndef __rtems__ |
---|
126 | u_int th_generation; |
---|
127 | #else /* __rtems__ */ |
---|
128 | Atomic_Ulong th_generation; |
---|
129 | #endif /* __rtems__ */ |
---|
130 | struct timehands *th_next; |
---|
131 | }; |
---|
132 | |
---|
133 | #if defined(RTEMS_SMP) |
---|
134 | static struct timehands th0; |
---|
135 | static struct timehands th9 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th0}; |
---|
136 | static struct timehands th8 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th9}; |
---|
137 | static struct timehands th7 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th8}; |
---|
138 | static struct timehands th6 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th7}; |
---|
139 | static struct timehands th5 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th6}; |
---|
140 | static struct timehands th4 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th5}; |
---|
141 | static struct timehands th3 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th4}; |
---|
142 | static struct timehands th2 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th3}; |
---|
143 | static struct timehands th1 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th2}; |
---|
144 | #endif |
---|
145 | static struct timehands th0 = { |
---|
146 | &dummy_timecounter, |
---|
147 | 0, |
---|
148 | (uint64_t)-1 / 1000000, |
---|
149 | 0, |
---|
150 | {1, 0}, |
---|
151 | #ifndef __rtems__ |
---|
152 | {0, 0}, |
---|
153 | {0, 0}, |
---|
154 | #else /* __rtems__ */ |
---|
155 | {TOD_SECONDS_1970_THROUGH_1988, 0}, |
---|
156 | {TOD_SECONDS_1970_THROUGH_1988, 0}, |
---|
157 | #endif /* __rtems__ */ |
---|
158 | 1, |
---|
159 | #if defined(RTEMS_SMP) |
---|
160 | &th1 |
---|
161 | #else |
---|
162 | &th0 |
---|
163 | #endif |
---|
164 | }; |
---|
165 | |
---|
166 | static struct timehands *volatile timehands = &th0; |
---|
167 | struct timecounter *timecounter = &dummy_timecounter; |
---|
168 | static struct timecounter *timecounters = &dummy_timecounter; |
---|
169 | |
---|
170 | #ifndef __rtems__ |
---|
171 | int tc_min_ticktock_freq = 1; |
---|
172 | #endif /* __rtems__ */ |
---|
173 | |
---|
174 | #ifndef __rtems__ |
---|
175 | volatile time_t time_second = 1; |
---|
176 | #else /* __rtems__ */ |
---|
177 | volatile time_t time_second = TOD_SECONDS_1970_THROUGH_1988; |
---|
178 | #endif /* __rtems__ */ |
---|
179 | volatile time_t time_uptime = 1; |
---|
180 | |
---|
181 | #ifndef __rtems__ |
---|
182 | struct bintime boottimebin; |
---|
183 | #else /* __rtems__ */ |
---|
184 | struct bintime boottimebin = { |
---|
185 | .sec = TOD_SECONDS_1970_THROUGH_1988 - 1 |
---|
186 | }; |
---|
187 | #endif /* __rtems__ */ |
---|
188 | #ifndef __rtems__ |
---|
189 | struct timeval boottime; |
---|
190 | static int sysctl_kern_boottime(SYSCTL_HANDLER_ARGS); |
---|
191 | SYSCTL_PROC(_kern, KERN_BOOTTIME, boottime, CTLTYPE_STRUCT|CTLFLAG_RD, |
---|
192 | NULL, 0, sysctl_kern_boottime, "S,timeval", "System boottime"); |
---|
193 | |
---|
194 | SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, ""); |
---|
195 | static SYSCTL_NODE(_kern_timecounter, OID_AUTO, tc, CTLFLAG_RW, 0, ""); |
---|
196 | |
---|
197 | static int timestepwarnings; |
---|
198 | SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW, |
---|
199 | ×tepwarnings, 0, "Log time steps"); |
---|
200 | |
---|
201 | struct bintime bt_timethreshold; |
---|
202 | struct bintime bt_tickthreshold; |
---|
203 | sbintime_t sbt_timethreshold; |
---|
204 | sbintime_t sbt_tickthreshold; |
---|
205 | struct bintime tc_tick_bt; |
---|
206 | sbintime_t tc_tick_sbt; |
---|
207 | int tc_precexp; |
---|
208 | int tc_timepercentage = TC_DEFAULTPERC; |
---|
209 | static int sysctl_kern_timecounter_adjprecision(SYSCTL_HANDLER_ARGS); |
---|
210 | SYSCTL_PROC(_kern_timecounter, OID_AUTO, alloweddeviation, |
---|
211 | CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, 0, |
---|
212 | sysctl_kern_timecounter_adjprecision, "I", |
---|
213 | "Allowed time interval deviation in percents"); |
---|
214 | #endif /* __rtems__ */ |
---|
215 | |
---|
216 | static void tc_windup(void); |
---|
217 | #ifndef __rtems__ |
---|
218 | static void cpu_tick_calibrate(int); |
---|
219 | #else /* __rtems__ */ |
---|
220 | static void _Timecounter_Windup(ISR_lock_Context *lock_context); |
---|
221 | #endif /* __rtems__ */ |
---|
222 | |
---|
223 | void dtrace_getnanotime(struct timespec *tsp); |
---|
224 | |
---|
225 | #ifndef __rtems__ |
---|
226 | static int |
---|
227 | sysctl_kern_boottime(SYSCTL_HANDLER_ARGS) |
---|
228 | { |
---|
229 | #ifndef __mips__ |
---|
230 | #ifdef SCTL_MASK32 |
---|
231 | int tv[2]; |
---|
232 | |
---|
233 | if (req->flags & SCTL_MASK32) { |
---|
234 | tv[0] = boottime.tv_sec; |
---|
235 | tv[1] = boottime.tv_usec; |
---|
236 | return SYSCTL_OUT(req, tv, sizeof(tv)); |
---|
237 | } else |
---|
238 | #endif |
---|
239 | #endif |
---|
240 | return SYSCTL_OUT(req, &boottime, sizeof(boottime)); |
---|
241 | } |
---|
242 | |
---|
243 | static int |
---|
244 | sysctl_kern_timecounter_get(SYSCTL_HANDLER_ARGS) |
---|
245 | { |
---|
246 | uint32_t ncount; |
---|
247 | struct timecounter *tc = arg1; |
---|
248 | |
---|
249 | ncount = tc->tc_get_timecount(tc); |
---|
250 | return sysctl_handle_int(oidp, &ncount, 0, req); |
---|
251 | } |
---|
252 | |
---|
253 | static int |
---|
254 | sysctl_kern_timecounter_freq(SYSCTL_HANDLER_ARGS) |
---|
255 | { |
---|
256 | uint64_t freq; |
---|
257 | struct timecounter *tc = arg1; |
---|
258 | |
---|
259 | freq = tc->tc_frequency; |
---|
260 | return sysctl_handle_64(oidp, &freq, 0, req); |
---|
261 | } |
---|
262 | #endif /* __rtems__ */ |
---|
263 | |
---|
264 | /* |
---|
265 | * Return the difference between the timehands' counter value now and what |
---|
266 | * was when we copied it to the timehands' offset_count. |
---|
267 | */ |
---|
268 | static __inline uint32_t |
---|
269 | tc_delta(struct timehands *th) |
---|
270 | { |
---|
271 | struct timecounter *tc; |
---|
272 | |
---|
273 | tc = th->th_counter; |
---|
274 | return ((tc->tc_get_timecount(tc) - th->th_offset_count) & |
---|
275 | tc->tc_counter_mask); |
---|
276 | } |
---|
277 | |
---|
278 | static u_int |
---|
279 | tc_getgen(struct timehands *th) |
---|
280 | { |
---|
281 | |
---|
282 | #ifndef __rtems__ |
---|
283 | #ifdef SMP |
---|
284 | return (atomic_load_acq_int(&th->th_generation)); |
---|
285 | #else |
---|
286 | u_int gen; |
---|
287 | |
---|
288 | gen = th->th_generation; |
---|
289 | __compiler_membar(); |
---|
290 | return (gen); |
---|
291 | #endif |
---|
292 | #else /* __rtems__ */ |
---|
293 | return (_Atomic_Load_ulong(&th->th_generation, ATOMIC_ORDER_ACQUIRE)); |
---|
294 | #endif /* __rtems__ */ |
---|
295 | } |
---|
296 | |
---|
297 | static void |
---|
298 | tc_setgen(struct timehands *th, u_int newgen) |
---|
299 | { |
---|
300 | |
---|
301 | #ifndef __rtems__ |
---|
302 | #ifdef SMP |
---|
303 | atomic_store_rel_int(&th->th_generation, newgen); |
---|
304 | #else |
---|
305 | __compiler_membar(); |
---|
306 | th->th_generation = newgen; |
---|
307 | #endif |
---|
308 | #else /* __rtems__ */ |
---|
309 | _Atomic_Store_ulong(&th->th_generation, newgen, ATOMIC_ORDER_RELEASE); |
---|
310 | #endif /* __rtems__ */ |
---|
311 | } |
---|
312 | |
---|
313 | /* |
---|
314 | * Functions for reading the time. We have to loop until we are sure that |
---|
315 | * the timehands that we operated on was not updated under our feet. See |
---|
316 | * the comment in <sys/time.h> for a description of these 12 functions. |
---|
317 | */ |
---|
318 | |
---|
319 | #ifdef FFCLOCK |
---|
320 | void |
---|
321 | fbclock_binuptime(struct bintime *bt) |
---|
322 | { |
---|
323 | struct timehands *th; |
---|
324 | unsigned int gen; |
---|
325 | |
---|
326 | do { |
---|
327 | th = timehands; |
---|
328 | gen = tc_getgen(th); |
---|
329 | *bt = th->th_offset; |
---|
330 | bintime_addx(bt, th->th_scale * tc_delta(th)); |
---|
331 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
332 | } |
---|
333 | |
---|
334 | void |
---|
335 | fbclock_nanouptime(struct timespec *tsp) |
---|
336 | { |
---|
337 | struct bintime bt; |
---|
338 | |
---|
339 | fbclock_binuptime(&bt); |
---|
340 | bintime2timespec(&bt, tsp); |
---|
341 | } |
---|
342 | |
---|
343 | void |
---|
344 | fbclock_microuptime(struct timeval *tvp) |
---|
345 | { |
---|
346 | struct bintime bt; |
---|
347 | |
---|
348 | fbclock_binuptime(&bt); |
---|
349 | bintime2timeval(&bt, tvp); |
---|
350 | } |
---|
351 | |
---|
352 | void |
---|
353 | fbclock_bintime(struct bintime *bt) |
---|
354 | { |
---|
355 | |
---|
356 | fbclock_binuptime(bt); |
---|
357 | bintime_add(bt, &boottimebin); |
---|
358 | } |
---|
359 | |
---|
360 | void |
---|
361 | fbclock_nanotime(struct timespec *tsp) |
---|
362 | { |
---|
363 | struct bintime bt; |
---|
364 | |
---|
365 | fbclock_bintime(&bt); |
---|
366 | bintime2timespec(&bt, tsp); |
---|
367 | } |
---|
368 | |
---|
369 | void |
---|
370 | fbclock_microtime(struct timeval *tvp) |
---|
371 | { |
---|
372 | struct bintime bt; |
---|
373 | |
---|
374 | fbclock_bintime(&bt); |
---|
375 | bintime2timeval(&bt, tvp); |
---|
376 | } |
---|
377 | |
---|
378 | void |
---|
379 | fbclock_getbinuptime(struct bintime *bt) |
---|
380 | { |
---|
381 | struct timehands *th; |
---|
382 | unsigned int gen; |
---|
383 | |
---|
384 | do { |
---|
385 | th = timehands; |
---|
386 | gen = tc_getgen(th); |
---|
387 | *bt = th->th_offset; |
---|
388 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
389 | } |
---|
390 | |
---|
391 | void |
---|
392 | fbclock_getnanouptime(struct timespec *tsp) |
---|
393 | { |
---|
394 | struct timehands *th; |
---|
395 | unsigned int gen; |
---|
396 | |
---|
397 | do { |
---|
398 | th = timehands; |
---|
399 | gen = tc_getgen(th); |
---|
400 | bintime2timespec(&th->th_offset, tsp); |
---|
401 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
402 | } |
---|
403 | |
---|
404 | void |
---|
405 | fbclock_getmicrouptime(struct timeval *tvp) |
---|
406 | { |
---|
407 | struct timehands *th; |
---|
408 | unsigned int gen; |
---|
409 | |
---|
410 | do { |
---|
411 | th = timehands; |
---|
412 | gen = tc_getgen(th); |
---|
413 | bintime2timeval(&th->th_offset, tvp); |
---|
414 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
415 | } |
---|
416 | |
---|
417 | void |
---|
418 | fbclock_getbintime(struct bintime *bt) |
---|
419 | { |
---|
420 | struct timehands *th; |
---|
421 | unsigned int gen; |
---|
422 | |
---|
423 | do { |
---|
424 | th = timehands; |
---|
425 | gen = tc_getgen(th); |
---|
426 | *bt = th->th_offset; |
---|
427 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
428 | bintime_add(bt, &boottimebin); |
---|
429 | } |
---|
430 | |
---|
431 | void |
---|
432 | fbclock_getnanotime(struct timespec *tsp) |
---|
433 | { |
---|
434 | struct timehands *th; |
---|
435 | unsigned int gen; |
---|
436 | |
---|
437 | do { |
---|
438 | th = timehands; |
---|
439 | gen = tc_getgen(th); |
---|
440 | *tsp = th->th_nanotime; |
---|
441 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
442 | } |
---|
443 | |
---|
444 | void |
---|
445 | fbclock_getmicrotime(struct timeval *tvp) |
---|
446 | { |
---|
447 | struct timehands *th; |
---|
448 | unsigned int gen; |
---|
449 | |
---|
450 | do { |
---|
451 | th = timehands; |
---|
452 | gen = tc_getgen(th); |
---|
453 | *tvp = th->th_microtime; |
---|
454 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
455 | } |
---|
456 | #else /* !FFCLOCK */ |
---|
457 | void |
---|
458 | binuptime(struct bintime *bt) |
---|
459 | { |
---|
460 | struct timehands *th; |
---|
461 | uint32_t gen; |
---|
462 | |
---|
463 | do { |
---|
464 | th = timehands; |
---|
465 | gen = tc_getgen(th); |
---|
466 | *bt = th->th_offset; |
---|
467 | bintime_addx(bt, th->th_scale * tc_delta(th)); |
---|
468 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
469 | } |
---|
470 | |
---|
471 | void |
---|
472 | nanouptime(struct timespec *tsp) |
---|
473 | { |
---|
474 | struct bintime bt; |
---|
475 | |
---|
476 | binuptime(&bt); |
---|
477 | bintime2timespec(&bt, tsp); |
---|
478 | } |
---|
479 | |
---|
480 | void |
---|
481 | microuptime(struct timeval *tvp) |
---|
482 | { |
---|
483 | struct bintime bt; |
---|
484 | |
---|
485 | binuptime(&bt); |
---|
486 | bintime2timeval(&bt, tvp); |
---|
487 | } |
---|
488 | |
---|
489 | void |
---|
490 | bintime(struct bintime *bt) |
---|
491 | { |
---|
492 | |
---|
493 | binuptime(bt); |
---|
494 | bintime_add(bt, &boottimebin); |
---|
495 | } |
---|
496 | |
---|
497 | void |
---|
498 | nanotime(struct timespec *tsp) |
---|
499 | { |
---|
500 | struct bintime bt; |
---|
501 | |
---|
502 | bintime(&bt); |
---|
503 | bintime2timespec(&bt, tsp); |
---|
504 | } |
---|
505 | |
---|
506 | void |
---|
507 | microtime(struct timeval *tvp) |
---|
508 | { |
---|
509 | struct bintime bt; |
---|
510 | |
---|
511 | bintime(&bt); |
---|
512 | bintime2timeval(&bt, tvp); |
---|
513 | } |
---|
514 | |
---|
515 | void |
---|
516 | getbinuptime(struct bintime *bt) |
---|
517 | { |
---|
518 | struct timehands *th; |
---|
519 | uint32_t gen; |
---|
520 | |
---|
521 | do { |
---|
522 | th = timehands; |
---|
523 | gen = tc_getgen(th); |
---|
524 | *bt = th->th_offset; |
---|
525 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
526 | } |
---|
527 | |
---|
528 | void |
---|
529 | getnanouptime(struct timespec *tsp) |
---|
530 | { |
---|
531 | struct timehands *th; |
---|
532 | uint32_t gen; |
---|
533 | |
---|
534 | do { |
---|
535 | th = timehands; |
---|
536 | gen = tc_getgen(th); |
---|
537 | bintime2timespec(&th->th_offset, tsp); |
---|
538 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
539 | } |
---|
540 | |
---|
541 | void |
---|
542 | getmicrouptime(struct timeval *tvp) |
---|
543 | { |
---|
544 | struct timehands *th; |
---|
545 | uint32_t gen; |
---|
546 | |
---|
547 | do { |
---|
548 | th = timehands; |
---|
549 | gen = tc_getgen(th); |
---|
550 | bintime2timeval(&th->th_offset, tvp); |
---|
551 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
552 | } |
---|
553 | |
---|
554 | void |
---|
555 | getbintime(struct bintime *bt) |
---|
556 | { |
---|
557 | struct timehands *th; |
---|
558 | uint32_t gen; |
---|
559 | |
---|
560 | do { |
---|
561 | th = timehands; |
---|
562 | gen = tc_getgen(th); |
---|
563 | *bt = th->th_offset; |
---|
564 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
565 | bintime_add(bt, &boottimebin); |
---|
566 | } |
---|
567 | |
---|
568 | void |
---|
569 | getnanotime(struct timespec *tsp) |
---|
570 | { |
---|
571 | struct timehands *th; |
---|
572 | uint32_t gen; |
---|
573 | |
---|
574 | do { |
---|
575 | th = timehands; |
---|
576 | gen = tc_getgen(th); |
---|
577 | *tsp = th->th_nanotime; |
---|
578 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
579 | } |
---|
580 | |
---|
581 | void |
---|
582 | getmicrotime(struct timeval *tvp) |
---|
583 | { |
---|
584 | struct timehands *th; |
---|
585 | uint32_t gen; |
---|
586 | |
---|
587 | do { |
---|
588 | th = timehands; |
---|
589 | gen = tc_getgen(th); |
---|
590 | *tvp = th->th_microtime; |
---|
591 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
592 | } |
---|
593 | #endif /* FFCLOCK */ |
---|
594 | |
---|
595 | #ifdef FFCLOCK |
---|
596 | /* |
---|
597 | * Support for feed-forward synchronization algorithms. This is heavily inspired |
---|
598 | * by the timehands mechanism but kept independent from it. *_windup() functions |
---|
599 | * have some connection to avoid accessing the timecounter hardware more than |
---|
600 | * necessary. |
---|
601 | */ |
---|
602 | |
---|
603 | /* Feed-forward clock estimates kept updated by the synchronization daemon. */ |
---|
604 | struct ffclock_estimate ffclock_estimate; |
---|
605 | struct bintime ffclock_boottime; /* Feed-forward boot time estimate. */ |
---|
606 | uint32_t ffclock_status; /* Feed-forward clock status. */ |
---|
607 | int8_t ffclock_updated; /* New estimates are available. */ |
---|
608 | struct mtx ffclock_mtx; /* Mutex on ffclock_estimate. */ |
---|
609 | |
---|
610 | struct fftimehands { |
---|
611 | struct ffclock_estimate cest; |
---|
612 | struct bintime tick_time; |
---|
613 | struct bintime tick_time_lerp; |
---|
614 | ffcounter tick_ffcount; |
---|
615 | uint64_t period_lerp; |
---|
616 | volatile uint8_t gen; |
---|
617 | struct fftimehands *next; |
---|
618 | }; |
---|
619 | |
---|
620 | #define NUM_ELEMENTS(x) (sizeof(x) / sizeof(*x)) |
---|
621 | |
---|
622 | static struct fftimehands ffth[10]; |
---|
623 | static struct fftimehands *volatile fftimehands = ffth; |
---|
624 | |
---|
625 | static void |
---|
626 | ffclock_init(void) |
---|
627 | { |
---|
628 | struct fftimehands *cur; |
---|
629 | struct fftimehands *last; |
---|
630 | |
---|
631 | memset(ffth, 0, sizeof(ffth)); |
---|
632 | |
---|
633 | last = ffth + NUM_ELEMENTS(ffth) - 1; |
---|
634 | for (cur = ffth; cur < last; cur++) |
---|
635 | cur->next = cur + 1; |
---|
636 | last->next = ffth; |
---|
637 | |
---|
638 | ffclock_updated = 0; |
---|
639 | ffclock_status = FFCLOCK_STA_UNSYNC; |
---|
640 | mtx_init(&ffclock_mtx, "ffclock lock", NULL, MTX_DEF); |
---|
641 | } |
---|
642 | |
---|
643 | /* |
---|
644 | * Reset the feed-forward clock estimates. Called from inittodr() to get things |
---|
645 | * kick started and uses the timecounter nominal frequency as a first period |
---|
646 | * estimate. Note: this function may be called several time just after boot. |
---|
647 | * Note: this is the only function that sets the value of boot time for the |
---|
648 | * monotonic (i.e. uptime) version of the feed-forward clock. |
---|
649 | */ |
---|
650 | void |
---|
651 | ffclock_reset_clock(struct timespec *ts) |
---|
652 | { |
---|
653 | struct timecounter *tc; |
---|
654 | struct ffclock_estimate cest; |
---|
655 | |
---|
656 | tc = timehands->th_counter; |
---|
657 | memset(&cest, 0, sizeof(struct ffclock_estimate)); |
---|
658 | |
---|
659 | timespec2bintime(ts, &ffclock_boottime); |
---|
660 | timespec2bintime(ts, &(cest.update_time)); |
---|
661 | ffclock_read_counter(&cest.update_ffcount); |
---|
662 | cest.leapsec_next = 0; |
---|
663 | cest.period = ((1ULL << 63) / tc->tc_frequency) << 1; |
---|
664 | cest.errb_abs = 0; |
---|
665 | cest.errb_rate = 0; |
---|
666 | cest.status = FFCLOCK_STA_UNSYNC; |
---|
667 | cest.leapsec_total = 0; |
---|
668 | cest.leapsec = 0; |
---|
669 | |
---|
670 | mtx_lock(&ffclock_mtx); |
---|
671 | bcopy(&cest, &ffclock_estimate, sizeof(struct ffclock_estimate)); |
---|
672 | ffclock_updated = INT8_MAX; |
---|
673 | mtx_unlock(&ffclock_mtx); |
---|
674 | |
---|
675 | printf("ffclock reset: %s (%llu Hz), time = %ld.%09lu\n", tc->tc_name, |
---|
676 | (unsigned long long)tc->tc_frequency, (long)ts->tv_sec, |
---|
677 | (unsigned long)ts->tv_nsec); |
---|
678 | } |
---|
679 | |
---|
680 | /* |
---|
681 | * Sub-routine to convert a time interval measured in RAW counter units to time |
---|
682 | * in seconds stored in bintime format. |
---|
683 | * NOTE: bintime_mul requires u_int, but the value of the ffcounter may be |
---|
684 | * larger than the max value of u_int (on 32 bit architecture). Loop to consume |
---|
685 | * extra cycles. |
---|
686 | */ |
---|
687 | static void |
---|
688 | ffclock_convert_delta(ffcounter ffdelta, uint64_t period, struct bintime *bt) |
---|
689 | { |
---|
690 | struct bintime bt2; |
---|
691 | ffcounter delta, delta_max; |
---|
692 | |
---|
693 | delta_max = (1ULL << (8 * sizeof(unsigned int))) - 1; |
---|
694 | bintime_clear(bt); |
---|
695 | do { |
---|
696 | if (ffdelta > delta_max) |
---|
697 | delta = delta_max; |
---|
698 | else |
---|
699 | delta = ffdelta; |
---|
700 | bt2.sec = 0; |
---|
701 | bt2.frac = period; |
---|
702 | bintime_mul(&bt2, (unsigned int)delta); |
---|
703 | bintime_add(bt, &bt2); |
---|
704 | ffdelta -= delta; |
---|
705 | } while (ffdelta > 0); |
---|
706 | } |
---|
707 | |
---|
708 | /* |
---|
709 | * Update the fftimehands. |
---|
710 | * Push the tick ffcount and time(s) forward based on current clock estimate. |
---|
711 | * The conversion from ffcounter to bintime relies on the difference clock |
---|
712 | * principle, whose accuracy relies on computing small time intervals. If a new |
---|
713 | * clock estimate has been passed by the synchronisation daemon, make it |
---|
714 | * current, and compute the linear interpolation for monotonic time if needed. |
---|
715 | */ |
---|
716 | static void |
---|
717 | ffclock_windup(unsigned int delta) |
---|
718 | { |
---|
719 | struct ffclock_estimate *cest; |
---|
720 | struct fftimehands *ffth; |
---|
721 | struct bintime bt, gap_lerp; |
---|
722 | ffcounter ffdelta; |
---|
723 | uint64_t frac; |
---|
724 | unsigned int polling; |
---|
725 | uint8_t forward_jump, ogen; |
---|
726 | |
---|
727 | /* |
---|
728 | * Pick the next timehand, copy current ffclock estimates and move tick |
---|
729 | * times and counter forward. |
---|
730 | */ |
---|
731 | forward_jump = 0; |
---|
732 | ffth = fftimehands->next; |
---|
733 | ogen = ffth->gen; |
---|
734 | ffth->gen = 0; |
---|
735 | cest = &ffth->cest; |
---|
736 | bcopy(&fftimehands->cest, cest, sizeof(struct ffclock_estimate)); |
---|
737 | ffdelta = (ffcounter)delta; |
---|
738 | ffth->period_lerp = fftimehands->period_lerp; |
---|
739 | |
---|
740 | ffth->tick_time = fftimehands->tick_time; |
---|
741 | ffclock_convert_delta(ffdelta, cest->period, &bt); |
---|
742 | bintime_add(&ffth->tick_time, &bt); |
---|
743 | |
---|
744 | ffth->tick_time_lerp = fftimehands->tick_time_lerp; |
---|
745 | ffclock_convert_delta(ffdelta, ffth->period_lerp, &bt); |
---|
746 | bintime_add(&ffth->tick_time_lerp, &bt); |
---|
747 | |
---|
748 | ffth->tick_ffcount = fftimehands->tick_ffcount + ffdelta; |
---|
749 | |
---|
750 | /* |
---|
751 | * Assess the status of the clock, if the last update is too old, it is |
---|
752 | * likely the synchronisation daemon is dead and the clock is free |
---|
753 | * running. |
---|
754 | */ |
---|
755 | if (ffclock_updated == 0) { |
---|
756 | ffdelta = ffth->tick_ffcount - cest->update_ffcount; |
---|
757 | ffclock_convert_delta(ffdelta, cest->period, &bt); |
---|
758 | if (bt.sec > 2 * FFCLOCK_SKM_SCALE) |
---|
759 | ffclock_status |= FFCLOCK_STA_UNSYNC; |
---|
760 | } |
---|
761 | |
---|
762 | /* |
---|
763 | * If available, grab updated clock estimates and make them current. |
---|
764 | * Recompute time at this tick using the updated estimates. The clock |
---|
765 | * estimates passed the feed-forward synchronisation daemon may result |
---|
766 | * in time conversion that is not monotonically increasing (just after |
---|
767 | * the update). time_lerp is a particular linear interpolation over the |
---|
768 | * synchronisation algo polling period that ensures monotonicity for the |
---|
769 | * clock ids requesting it. |
---|
770 | */ |
---|
771 | if (ffclock_updated > 0) { |
---|
772 | bcopy(&ffclock_estimate, cest, sizeof(struct ffclock_estimate)); |
---|
773 | ffdelta = ffth->tick_ffcount - cest->update_ffcount; |
---|
774 | ffth->tick_time = cest->update_time; |
---|
775 | ffclock_convert_delta(ffdelta, cest->period, &bt); |
---|
776 | bintime_add(&ffth->tick_time, &bt); |
---|
777 | |
---|
778 | /* ffclock_reset sets ffclock_updated to INT8_MAX */ |
---|
779 | if (ffclock_updated == INT8_MAX) |
---|
780 | ffth->tick_time_lerp = ffth->tick_time; |
---|
781 | |
---|
782 | if (bintime_cmp(&ffth->tick_time, &ffth->tick_time_lerp, >)) |
---|
783 | forward_jump = 1; |
---|
784 | else |
---|
785 | forward_jump = 0; |
---|
786 | |
---|
787 | bintime_clear(&gap_lerp); |
---|
788 | if (forward_jump) { |
---|
789 | gap_lerp = ffth->tick_time; |
---|
790 | bintime_sub(&gap_lerp, &ffth->tick_time_lerp); |
---|
791 | } else { |
---|
792 | gap_lerp = ffth->tick_time_lerp; |
---|
793 | bintime_sub(&gap_lerp, &ffth->tick_time); |
---|
794 | } |
---|
795 | |
---|
796 | /* |
---|
797 | * The reset from the RTC clock may be far from accurate, and |
---|
798 | * reducing the gap between real time and interpolated time |
---|
799 | * could take a very long time if the interpolated clock insists |
---|
800 | * on strict monotonicity. The clock is reset under very strict |
---|
801 | * conditions (kernel time is known to be wrong and |
---|
802 | * synchronization daemon has been restarted recently. |
---|
803 | * ffclock_boottime absorbs the jump to ensure boot time is |
---|
804 | * correct and uptime functions stay consistent. |
---|
805 | */ |
---|
806 | if (((ffclock_status & FFCLOCK_STA_UNSYNC) == FFCLOCK_STA_UNSYNC) && |
---|
807 | ((cest->status & FFCLOCK_STA_UNSYNC) == 0) && |
---|
808 | ((cest->status & FFCLOCK_STA_WARMUP) == FFCLOCK_STA_WARMUP)) { |
---|
809 | if (forward_jump) |
---|
810 | bintime_add(&ffclock_boottime, &gap_lerp); |
---|
811 | else |
---|
812 | bintime_sub(&ffclock_boottime, &gap_lerp); |
---|
813 | ffth->tick_time_lerp = ffth->tick_time; |
---|
814 | bintime_clear(&gap_lerp); |
---|
815 | } |
---|
816 | |
---|
817 | ffclock_status = cest->status; |
---|
818 | ffth->period_lerp = cest->period; |
---|
819 | |
---|
820 | /* |
---|
821 | * Compute corrected period used for the linear interpolation of |
---|
822 | * time. The rate of linear interpolation is capped to 5000PPM |
---|
823 | * (5ms/s). |
---|
824 | */ |
---|
825 | if (bintime_isset(&gap_lerp)) { |
---|
826 | ffdelta = cest->update_ffcount; |
---|
827 | ffdelta -= fftimehands->cest.update_ffcount; |
---|
828 | ffclock_convert_delta(ffdelta, cest->period, &bt); |
---|
829 | polling = bt.sec; |
---|
830 | bt.sec = 0; |
---|
831 | bt.frac = 5000000 * (uint64_t)18446744073LL; |
---|
832 | bintime_mul(&bt, polling); |
---|
833 | if (bintime_cmp(&gap_lerp, &bt, >)) |
---|
834 | gap_lerp = bt; |
---|
835 | |
---|
836 | /* Approximate 1 sec by 1-(1/2^64) to ease arithmetic */ |
---|
837 | frac = 0; |
---|
838 | if (gap_lerp.sec > 0) { |
---|
839 | frac -= 1; |
---|
840 | frac /= ffdelta / gap_lerp.sec; |
---|
841 | } |
---|
842 | frac += gap_lerp.frac / ffdelta; |
---|
843 | |
---|
844 | if (forward_jump) |
---|
845 | ffth->period_lerp += frac; |
---|
846 | else |
---|
847 | ffth->period_lerp -= frac; |
---|
848 | } |
---|
849 | |
---|
850 | ffclock_updated = 0; |
---|
851 | } |
---|
852 | if (++ogen == 0) |
---|
853 | ogen = 1; |
---|
854 | ffth->gen = ogen; |
---|
855 | fftimehands = ffth; |
---|
856 | } |
---|
857 | |
---|
858 | /* |
---|
859 | * Adjust the fftimehands when the timecounter is changed. Stating the obvious, |
---|
860 | * the old and new hardware counter cannot be read simultaneously. tc_windup() |
---|
861 | * does read the two counters 'back to back', but a few cycles are effectively |
---|
862 | * lost, and not accumulated in tick_ffcount. This is a fairly radical |
---|
863 | * operation for a feed-forward synchronization daemon, and it is its job to not |
---|
864 | * pushing irrelevant data to the kernel. Because there is no locking here, |
---|
865 | * simply force to ignore pending or next update to give daemon a chance to |
---|
866 | * realize the counter has changed. |
---|
867 | */ |
---|
868 | static void |
---|
869 | ffclock_change_tc(struct timehands *th) |
---|
870 | { |
---|
871 | struct fftimehands *ffth; |
---|
872 | struct ffclock_estimate *cest; |
---|
873 | struct timecounter *tc; |
---|
874 | uint8_t ogen; |
---|
875 | |
---|
876 | tc = th->th_counter; |
---|
877 | ffth = fftimehands->next; |
---|
878 | ogen = ffth->gen; |
---|
879 | ffth->gen = 0; |
---|
880 | |
---|
881 | cest = &ffth->cest; |
---|
882 | bcopy(&(fftimehands->cest), cest, sizeof(struct ffclock_estimate)); |
---|
883 | cest->period = ((1ULL << 63) / tc->tc_frequency ) << 1; |
---|
884 | cest->errb_abs = 0; |
---|
885 | cest->errb_rate = 0; |
---|
886 | cest->status |= FFCLOCK_STA_UNSYNC; |
---|
887 | |
---|
888 | ffth->tick_ffcount = fftimehands->tick_ffcount; |
---|
889 | ffth->tick_time_lerp = fftimehands->tick_time_lerp; |
---|
890 | ffth->tick_time = fftimehands->tick_time; |
---|
891 | ffth->period_lerp = cest->period; |
---|
892 | |
---|
893 | /* Do not lock but ignore next update from synchronization daemon. */ |
---|
894 | ffclock_updated--; |
---|
895 | |
---|
896 | if (++ogen == 0) |
---|
897 | ogen = 1; |
---|
898 | ffth->gen = ogen; |
---|
899 | fftimehands = ffth; |
---|
900 | } |
---|
901 | |
---|
902 | /* |
---|
903 | * Retrieve feed-forward counter and time of last kernel tick. |
---|
904 | */ |
---|
905 | void |
---|
906 | ffclock_last_tick(ffcounter *ffcount, struct bintime *bt, uint32_t flags) |
---|
907 | { |
---|
908 | struct fftimehands *ffth; |
---|
909 | uint8_t gen; |
---|
910 | |
---|
911 | /* |
---|
912 | * No locking but check generation has not changed. Also need to make |
---|
913 | * sure ffdelta is positive, i.e. ffcount > tick_ffcount. |
---|
914 | */ |
---|
915 | do { |
---|
916 | ffth = fftimehands; |
---|
917 | gen = ffth->gen; |
---|
918 | if ((flags & FFCLOCK_LERP) == FFCLOCK_LERP) |
---|
919 | *bt = ffth->tick_time_lerp; |
---|
920 | else |
---|
921 | *bt = ffth->tick_time; |
---|
922 | *ffcount = ffth->tick_ffcount; |
---|
923 | } while (gen == 0 || gen != ffth->gen); |
---|
924 | } |
---|
925 | |
---|
926 | /* |
---|
927 | * Absolute clock conversion. Low level function to convert ffcounter to |
---|
928 | * bintime. The ffcounter is converted using the current ffclock period estimate |
---|
929 | * or the "interpolated period" to ensure monotonicity. |
---|
930 | * NOTE: this conversion may have been deferred, and the clock updated since the |
---|
931 | * hardware counter has been read. |
---|
932 | */ |
---|
933 | void |
---|
934 | ffclock_convert_abs(ffcounter ffcount, struct bintime *bt, uint32_t flags) |
---|
935 | { |
---|
936 | struct fftimehands *ffth; |
---|
937 | struct bintime bt2; |
---|
938 | ffcounter ffdelta; |
---|
939 | uint8_t gen; |
---|
940 | |
---|
941 | /* |
---|
942 | * No locking but check generation has not changed. Also need to make |
---|
943 | * sure ffdelta is positive, i.e. ffcount > tick_ffcount. |
---|
944 | */ |
---|
945 | do { |
---|
946 | ffth = fftimehands; |
---|
947 | gen = ffth->gen; |
---|
948 | if (ffcount > ffth->tick_ffcount) |
---|
949 | ffdelta = ffcount - ffth->tick_ffcount; |
---|
950 | else |
---|
951 | ffdelta = ffth->tick_ffcount - ffcount; |
---|
952 | |
---|
953 | if ((flags & FFCLOCK_LERP) == FFCLOCK_LERP) { |
---|
954 | *bt = ffth->tick_time_lerp; |
---|
955 | ffclock_convert_delta(ffdelta, ffth->period_lerp, &bt2); |
---|
956 | } else { |
---|
957 | *bt = ffth->tick_time; |
---|
958 | ffclock_convert_delta(ffdelta, ffth->cest.period, &bt2); |
---|
959 | } |
---|
960 | |
---|
961 | if (ffcount > ffth->tick_ffcount) |
---|
962 | bintime_add(bt, &bt2); |
---|
963 | else |
---|
964 | bintime_sub(bt, &bt2); |
---|
965 | } while (gen == 0 || gen != ffth->gen); |
---|
966 | } |
---|
967 | |
---|
968 | /* |
---|
969 | * Difference clock conversion. |
---|
970 | * Low level function to Convert a time interval measured in RAW counter units |
---|
971 | * into bintime. The difference clock allows measuring small intervals much more |
---|
972 | * reliably than the absolute clock. |
---|
973 | */ |
---|
974 | void |
---|
975 | ffclock_convert_diff(ffcounter ffdelta, struct bintime *bt) |
---|
976 | { |
---|
977 | struct fftimehands *ffth; |
---|
978 | uint8_t gen; |
---|
979 | |
---|
980 | /* No locking but check generation has not changed. */ |
---|
981 | do { |
---|
982 | ffth = fftimehands; |
---|
983 | gen = ffth->gen; |
---|
984 | ffclock_convert_delta(ffdelta, ffth->cest.period, bt); |
---|
985 | } while (gen == 0 || gen != ffth->gen); |
---|
986 | } |
---|
987 | |
---|
988 | /* |
---|
989 | * Access to current ffcounter value. |
---|
990 | */ |
---|
991 | void |
---|
992 | ffclock_read_counter(ffcounter *ffcount) |
---|
993 | { |
---|
994 | struct timehands *th; |
---|
995 | struct fftimehands *ffth; |
---|
996 | unsigned int gen, delta; |
---|
997 | |
---|
998 | /* |
---|
999 | * ffclock_windup() called from tc_windup(), safe to rely on |
---|
1000 | * th->th_generation only, for correct delta and ffcounter. |
---|
1001 | */ |
---|
1002 | do { |
---|
1003 | th = timehands; |
---|
1004 | gen = tc_getgen(th); |
---|
1005 | ffth = fftimehands; |
---|
1006 | delta = tc_delta(th); |
---|
1007 | *ffcount = ffth->tick_ffcount; |
---|
1008 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
1009 | |
---|
1010 | *ffcount += delta; |
---|
1011 | } |
---|
1012 | |
---|
1013 | void |
---|
1014 | binuptime(struct bintime *bt) |
---|
1015 | { |
---|
1016 | |
---|
1017 | binuptime_fromclock(bt, sysclock_active); |
---|
1018 | } |
---|
1019 | |
---|
1020 | void |
---|
1021 | nanouptime(struct timespec *tsp) |
---|
1022 | { |
---|
1023 | |
---|
1024 | nanouptime_fromclock(tsp, sysclock_active); |
---|
1025 | } |
---|
1026 | |
---|
1027 | void |
---|
1028 | microuptime(struct timeval *tvp) |
---|
1029 | { |
---|
1030 | |
---|
1031 | microuptime_fromclock(tvp, sysclock_active); |
---|
1032 | } |
---|
1033 | |
---|
1034 | void |
---|
1035 | bintime(struct bintime *bt) |
---|
1036 | { |
---|
1037 | |
---|
1038 | bintime_fromclock(bt, sysclock_active); |
---|
1039 | } |
---|
1040 | |
---|
1041 | void |
---|
1042 | nanotime(struct timespec *tsp) |
---|
1043 | { |
---|
1044 | |
---|
1045 | nanotime_fromclock(tsp, sysclock_active); |
---|
1046 | } |
---|
1047 | |
---|
1048 | void |
---|
1049 | microtime(struct timeval *tvp) |
---|
1050 | { |
---|
1051 | |
---|
1052 | microtime_fromclock(tvp, sysclock_active); |
---|
1053 | } |
---|
1054 | |
---|
1055 | void |
---|
1056 | getbinuptime(struct bintime *bt) |
---|
1057 | { |
---|
1058 | |
---|
1059 | getbinuptime_fromclock(bt, sysclock_active); |
---|
1060 | } |
---|
1061 | |
---|
1062 | void |
---|
1063 | getnanouptime(struct timespec *tsp) |
---|
1064 | { |
---|
1065 | |
---|
1066 | getnanouptime_fromclock(tsp, sysclock_active); |
---|
1067 | } |
---|
1068 | |
---|
1069 | void |
---|
1070 | getmicrouptime(struct timeval *tvp) |
---|
1071 | { |
---|
1072 | |
---|
1073 | getmicrouptime_fromclock(tvp, sysclock_active); |
---|
1074 | } |
---|
1075 | |
---|
1076 | void |
---|
1077 | getbintime(struct bintime *bt) |
---|
1078 | { |
---|
1079 | |
---|
1080 | getbintime_fromclock(bt, sysclock_active); |
---|
1081 | } |
---|
1082 | |
---|
1083 | void |
---|
1084 | getnanotime(struct timespec *tsp) |
---|
1085 | { |
---|
1086 | |
---|
1087 | getnanotime_fromclock(tsp, sysclock_active); |
---|
1088 | } |
---|
1089 | |
---|
1090 | void |
---|
1091 | getmicrotime(struct timeval *tvp) |
---|
1092 | { |
---|
1093 | |
---|
1094 | getmicrouptime_fromclock(tvp, sysclock_active); |
---|
1095 | } |
---|
1096 | |
---|
1097 | #endif /* FFCLOCK */ |
---|
1098 | |
---|
1099 | #ifndef __rtems__ |
---|
1100 | /* |
---|
1101 | * This is a clone of getnanotime and used for walltimestamps. |
---|
1102 | * The dtrace_ prefix prevents fbt from creating probes for |
---|
1103 | * it so walltimestamp can be safely used in all fbt probes. |
---|
1104 | */ |
---|
1105 | void |
---|
1106 | dtrace_getnanotime(struct timespec *tsp) |
---|
1107 | { |
---|
1108 | struct timehands *th; |
---|
1109 | uint32_t gen; |
---|
1110 | |
---|
1111 | do { |
---|
1112 | th = timehands; |
---|
1113 | gen = tc_getgen(th); |
---|
1114 | *tsp = th->th_nanotime; |
---|
1115 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
1116 | } |
---|
1117 | #endif /* __rtems__ */ |
---|
1118 | |
---|
1119 | #ifdef FFCLOCK |
---|
1120 | /* |
---|
1121 | * System clock currently providing time to the system. Modifiable via sysctl |
---|
1122 | * when the FFCLOCK option is defined. |
---|
1123 | */ |
---|
1124 | int sysclock_active = SYSCLOCK_FBCK; |
---|
1125 | #endif |
---|
1126 | |
---|
1127 | /* Internal NTP status and error estimates. */ |
---|
1128 | extern int time_status; |
---|
1129 | extern long time_esterror; |
---|
1130 | |
---|
1131 | #ifndef __rtems__ |
---|
1132 | /* |
---|
1133 | * Take a snapshot of sysclock data which can be used to compare system clocks |
---|
1134 | * and generate timestamps after the fact. |
---|
1135 | */ |
---|
1136 | void |
---|
1137 | sysclock_getsnapshot(struct sysclock_snap *clock_snap, int fast) |
---|
1138 | { |
---|
1139 | struct fbclock_info *fbi; |
---|
1140 | struct timehands *th; |
---|
1141 | struct bintime bt; |
---|
1142 | unsigned int delta, gen; |
---|
1143 | #ifdef FFCLOCK |
---|
1144 | ffcounter ffcount; |
---|
1145 | struct fftimehands *ffth; |
---|
1146 | struct ffclock_info *ffi; |
---|
1147 | struct ffclock_estimate cest; |
---|
1148 | |
---|
1149 | ffi = &clock_snap->ff_info; |
---|
1150 | #endif |
---|
1151 | |
---|
1152 | fbi = &clock_snap->fb_info; |
---|
1153 | delta = 0; |
---|
1154 | |
---|
1155 | do { |
---|
1156 | th = timehands; |
---|
1157 | gen = tc_getgen(th); |
---|
1158 | fbi->th_scale = th->th_scale; |
---|
1159 | fbi->tick_time = th->th_offset; |
---|
1160 | #ifdef FFCLOCK |
---|
1161 | ffth = fftimehands; |
---|
1162 | ffi->tick_time = ffth->tick_time_lerp; |
---|
1163 | ffi->tick_time_lerp = ffth->tick_time_lerp; |
---|
1164 | ffi->period = ffth->cest.period; |
---|
1165 | ffi->period_lerp = ffth->period_lerp; |
---|
1166 | clock_snap->ffcount = ffth->tick_ffcount; |
---|
1167 | cest = ffth->cest; |
---|
1168 | #endif |
---|
1169 | if (!fast) |
---|
1170 | delta = tc_delta(th); |
---|
1171 | } while (gen == 0 || gen != tc_getgen(th)); |
---|
1172 | |
---|
1173 | clock_snap->delta = delta; |
---|
1174 | #ifdef FFCLOCK |
---|
1175 | clock_snap->sysclock_active = sysclock_active; |
---|
1176 | #endif |
---|
1177 | |
---|
1178 | /* Record feedback clock status and error. */ |
---|
1179 | clock_snap->fb_info.status = time_status; |
---|
1180 | /* XXX: Very crude estimate of feedback clock error. */ |
---|
1181 | bt.sec = time_esterror / 1000000; |
---|
1182 | bt.frac = ((time_esterror - bt.sec) * 1000000) * |
---|
1183 | (uint64_t)18446744073709ULL; |
---|
1184 | clock_snap->fb_info.error = bt; |
---|
1185 | |
---|
1186 | #ifdef FFCLOCK |
---|
1187 | if (!fast) |
---|
1188 | clock_snap->ffcount += delta; |
---|
1189 | |
---|
1190 | /* Record feed-forward clock leap second adjustment. */ |
---|
1191 | ffi->leapsec_adjustment = cest.leapsec_total; |
---|
1192 | if (clock_snap->ffcount > cest.leapsec_next) |
---|
1193 | ffi->leapsec_adjustment -= cest.leapsec; |
---|
1194 | |
---|
1195 | /* Record feed-forward clock status and error. */ |
---|
1196 | clock_snap->ff_info.status = cest.status; |
---|
1197 | ffcount = clock_snap->ffcount - cest.update_ffcount; |
---|
1198 | ffclock_convert_delta(ffcount, cest.period, &bt); |
---|
1199 | /* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s]. */ |
---|
1200 | bintime_mul(&bt, cest.errb_rate * (uint64_t)18446744073709ULL); |
---|
1201 | /* 18446744073 = int(2^64 / 1e9), since err_abs in [ns]. */ |
---|
1202 | bintime_addx(&bt, cest.errb_abs * (uint64_t)18446744073ULL); |
---|
1203 | clock_snap->ff_info.error = bt; |
---|
1204 | #endif |
---|
1205 | } |
---|
1206 | |
---|
1207 | /* |
---|
1208 | * Convert a sysclock snapshot into a struct bintime based on the specified |
---|
1209 | * clock source and flags. |
---|
1210 | */ |
---|
1211 | int |
---|
1212 | sysclock_snap2bintime(struct sysclock_snap *cs, struct bintime *bt, |
---|
1213 | int whichclock, uint32_t flags) |
---|
1214 | { |
---|
1215 | #ifdef FFCLOCK |
---|
1216 | struct bintime bt2; |
---|
1217 | uint64_t period; |
---|
1218 | #endif |
---|
1219 | |
---|
1220 | switch (whichclock) { |
---|
1221 | case SYSCLOCK_FBCK: |
---|
1222 | *bt = cs->fb_info.tick_time; |
---|
1223 | |
---|
1224 | /* If snapshot was created with !fast, delta will be >0. */ |
---|
1225 | if (cs->delta > 0) |
---|
1226 | bintime_addx(bt, cs->fb_info.th_scale * cs->delta); |
---|
1227 | |
---|
1228 | if ((flags & FBCLOCK_UPTIME) == 0) |
---|
1229 | bintime_add(bt, &boottimebin); |
---|
1230 | break; |
---|
1231 | #ifdef FFCLOCK |
---|
1232 | case SYSCLOCK_FFWD: |
---|
1233 | if (flags & FFCLOCK_LERP) { |
---|
1234 | *bt = cs->ff_info.tick_time_lerp; |
---|
1235 | period = cs->ff_info.period_lerp; |
---|
1236 | } else { |
---|
1237 | *bt = cs->ff_info.tick_time; |
---|
1238 | period = cs->ff_info.period; |
---|
1239 | } |
---|
1240 | |
---|
1241 | /* If snapshot was created with !fast, delta will be >0. */ |
---|
1242 | if (cs->delta > 0) { |
---|
1243 | ffclock_convert_delta(cs->delta, period, &bt2); |
---|
1244 | bintime_add(bt, &bt2); |
---|
1245 | } |
---|
1246 | |
---|
1247 | /* Leap second adjustment. */ |
---|
1248 | if (flags & FFCLOCK_LEAPSEC) |
---|
1249 | bt->sec -= cs->ff_info.leapsec_adjustment; |
---|
1250 | |
---|
1251 | /* Boot time adjustment, for uptime/monotonic clocks. */ |
---|
1252 | if (flags & FFCLOCK_UPTIME) |
---|
1253 | bintime_sub(bt, &ffclock_boottime); |
---|
1254 | break; |
---|
1255 | #endif |
---|
1256 | default: |
---|
1257 | return (EINVAL); |
---|
1258 | break; |
---|
1259 | } |
---|
1260 | |
---|
1261 | return (0); |
---|
1262 | } |
---|
1263 | #endif /* __rtems__ */ |
---|
1264 | |
---|
1265 | /* |
---|
1266 | * Initialize a new timecounter and possibly use it. |
---|
1267 | */ |
---|
1268 | void |
---|
1269 | tc_init(struct timecounter *tc) |
---|
1270 | { |
---|
1271 | #ifndef __rtems__ |
---|
1272 | uint32_t u; |
---|
1273 | struct sysctl_oid *tc_root; |
---|
1274 | |
---|
1275 | u = tc->tc_frequency / tc->tc_counter_mask; |
---|
1276 | /* XXX: We need some margin here, 10% is a guess */ |
---|
1277 | u *= 11; |
---|
1278 | u /= 10; |
---|
1279 | if (u > hz && tc->tc_quality >= 0) { |
---|
1280 | tc->tc_quality = -2000; |
---|
1281 | if (bootverbose) { |
---|
1282 | printf("Timecounter \"%s\" frequency %ju Hz", |
---|
1283 | tc->tc_name, (uintmax_t)tc->tc_frequency); |
---|
1284 | printf(" -- Insufficient hz, needs at least %u\n", u); |
---|
1285 | } |
---|
1286 | } else if (tc->tc_quality >= 0 || bootverbose) { |
---|
1287 | printf("Timecounter \"%s\" frequency %ju Hz quality %d\n", |
---|
1288 | tc->tc_name, (uintmax_t)tc->tc_frequency, |
---|
1289 | tc->tc_quality); |
---|
1290 | } |
---|
1291 | #endif /* __rtems__ */ |
---|
1292 | |
---|
1293 | tc->tc_next = timecounters; |
---|
1294 | timecounters = tc; |
---|
1295 | #ifndef __rtems__ |
---|
1296 | /* |
---|
1297 | * Set up sysctl tree for this counter. |
---|
1298 | */ |
---|
1299 | tc_root = SYSCTL_ADD_NODE(NULL, |
---|
1300 | SYSCTL_STATIC_CHILDREN(_kern_timecounter_tc), OID_AUTO, tc->tc_name, |
---|
1301 | CTLFLAG_RW, 0, "timecounter description"); |
---|
1302 | SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO, |
---|
1303 | "mask", CTLFLAG_RD, &(tc->tc_counter_mask), 0, |
---|
1304 | "mask for implemented bits"); |
---|
1305 | SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO, |
---|
1306 | "counter", CTLTYPE_UINT | CTLFLAG_RD, tc, sizeof(*tc), |
---|
1307 | sysctl_kern_timecounter_get, "IU", "current timecounter value"); |
---|
1308 | SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO, |
---|
1309 | "frequency", CTLTYPE_U64 | CTLFLAG_RD, tc, sizeof(*tc), |
---|
1310 | sysctl_kern_timecounter_freq, "QU", "timecounter frequency"); |
---|
1311 | SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO, |
---|
1312 | "quality", CTLFLAG_RD, &(tc->tc_quality), 0, |
---|
1313 | "goodness of time counter"); |
---|
1314 | /* |
---|
1315 | * Never automatically use a timecounter with negative quality. |
---|
1316 | * Even though we run on the dummy counter, switching here may be |
---|
1317 | * worse since this timecounter may not be monotonous. |
---|
1318 | */ |
---|
1319 | if (tc->tc_quality < 0) |
---|
1320 | return; |
---|
1321 | if (tc->tc_quality < timecounter->tc_quality) |
---|
1322 | return; |
---|
1323 | if (tc->tc_quality == timecounter->tc_quality && |
---|
1324 | tc->tc_frequency < timecounter->tc_frequency) |
---|
1325 | return; |
---|
1326 | #endif /* __rtems__ */ |
---|
1327 | (void)tc->tc_get_timecount(tc); |
---|
1328 | (void)tc->tc_get_timecount(tc); |
---|
1329 | timecounter = tc; |
---|
1330 | #ifdef __rtems__ |
---|
1331 | tc_windup(); |
---|
1332 | #endif /* __rtems__ */ |
---|
1333 | } |
---|
1334 | |
---|
1335 | #ifndef __rtems__ |
---|
1336 | /* Report the frequency of the current timecounter. */ |
---|
1337 | uint64_t |
---|
1338 | tc_getfrequency(void) |
---|
1339 | { |
---|
1340 | |
---|
1341 | return (timehands->th_counter->tc_frequency); |
---|
1342 | } |
---|
1343 | #endif /* __rtems__ */ |
---|
1344 | |
---|
1345 | /* |
---|
1346 | * Step our concept of UTC. This is done by modifying our estimate of |
---|
1347 | * when we booted. |
---|
1348 | * XXX: not locked. |
---|
1349 | */ |
---|
1350 | void |
---|
1351 | #ifndef __rtems__ |
---|
1352 | tc_setclock(struct timespec *ts) |
---|
1353 | #else /* __rtems__ */ |
---|
1354 | _Timecounter_Set_clock(const struct bintime *_bt, |
---|
1355 | ISR_lock_Context *lock_context) |
---|
1356 | #endif /* __rtems__ */ |
---|
1357 | { |
---|
1358 | #ifndef __rtems__ |
---|
1359 | struct timespec tbef, taft; |
---|
1360 | #endif /* __rtems__ */ |
---|
1361 | struct bintime bt, bt2; |
---|
1362 | |
---|
1363 | #ifndef __rtems__ |
---|
1364 | cpu_tick_calibrate(1); |
---|
1365 | nanotime(&tbef); |
---|
1366 | timespec2bintime(ts, &bt); |
---|
1367 | #else /* __rtems__ */ |
---|
1368 | bt = *_bt; |
---|
1369 | #endif /* __rtems__ */ |
---|
1370 | binuptime(&bt2); |
---|
1371 | bintime_sub(&bt, &bt2); |
---|
1372 | bintime_add(&bt2, &boottimebin); |
---|
1373 | boottimebin = bt; |
---|
1374 | #ifndef __rtems__ |
---|
1375 | bintime2timeval(&bt, &boottime); |
---|
1376 | |
---|
1377 | /* XXX fiddle all the little crinkly bits around the fiords... */ |
---|
1378 | tc_windup(); |
---|
1379 | nanotime(&taft); |
---|
1380 | if (timestepwarnings) { |
---|
1381 | log(LOG_INFO, |
---|
1382 | "Time stepped from %jd.%09ld to %jd.%09ld (%jd.%09ld)\n", |
---|
1383 | (intmax_t)tbef.tv_sec, tbef.tv_nsec, |
---|
1384 | (intmax_t)taft.tv_sec, taft.tv_nsec, |
---|
1385 | (intmax_t)ts->tv_sec, ts->tv_nsec); |
---|
1386 | } |
---|
1387 | cpu_tick_calibrate(1); |
---|
1388 | #else /* __rtems__ */ |
---|
1389 | _Timecounter_Windup(lock_context); |
---|
1390 | #endif /* __rtems__ */ |
---|
1391 | } |
---|
1392 | |
---|
1393 | /* |
---|
1394 | * Initialize the next struct timehands in the ring and make |
---|
1395 | * it the active timehands. Along the way we might switch to a different |
---|
1396 | * timecounter and/or do seconds processing in NTP. Slightly magic. |
---|
1397 | */ |
---|
1398 | static void |
---|
1399 | tc_windup(void) |
---|
1400 | #ifdef __rtems__ |
---|
1401 | { |
---|
1402 | ISR_lock_Context lock_context; |
---|
1403 | |
---|
1404 | _Timecounter_Acquire(&lock_context); |
---|
1405 | _Timecounter_Windup(&lock_context); |
---|
1406 | } |
---|
1407 | |
---|
1408 | static void |
---|
1409 | _Timecounter_Windup(ISR_lock_Context *lock_context) |
---|
1410 | #endif /* __rtems__ */ |
---|
1411 | { |
---|
1412 | struct bintime bt; |
---|
1413 | struct timehands *th, *tho; |
---|
1414 | uint64_t scale; |
---|
1415 | uint32_t delta, ncount, ogen; |
---|
1416 | int i; |
---|
1417 | time_t t; |
---|
1418 | |
---|
1419 | /* |
---|
1420 | * Make the next timehands a copy of the current one, but do not |
---|
1421 | * overwrite the generation or next pointer. While we update |
---|
1422 | * the contents, the generation must be zero. |
---|
1423 | */ |
---|
1424 | tho = timehands; |
---|
1425 | #if defined(RTEMS_SMP) |
---|
1426 | th = tho->th_next; |
---|
1427 | #else |
---|
1428 | th = tho; |
---|
1429 | #endif |
---|
1430 | ogen = th->th_generation; |
---|
1431 | tc_setgen(th, 0); |
---|
1432 | #if defined(RTEMS_SMP) |
---|
1433 | bcopy(tho, th, offsetof(struct timehands, th_generation)); |
---|
1434 | #endif |
---|
1435 | |
---|
1436 | /* |
---|
1437 | * Capture a timecounter delta on the current timecounter and if |
---|
1438 | * changing timecounters, a counter value from the new timecounter. |
---|
1439 | * Update the offset fields accordingly. |
---|
1440 | */ |
---|
1441 | delta = tc_delta(th); |
---|
1442 | if (th->th_counter != timecounter) |
---|
1443 | ncount = timecounter->tc_get_timecount(timecounter); |
---|
1444 | else |
---|
1445 | ncount = 0; |
---|
1446 | #ifdef FFCLOCK |
---|
1447 | ffclock_windup(delta); |
---|
1448 | #endif |
---|
1449 | th->th_offset_count += delta; |
---|
1450 | th->th_offset_count &= th->th_counter->tc_counter_mask; |
---|
1451 | while (delta > th->th_counter->tc_frequency) { |
---|
1452 | /* Eat complete unadjusted seconds. */ |
---|
1453 | delta -= th->th_counter->tc_frequency; |
---|
1454 | th->th_offset.sec++; |
---|
1455 | } |
---|
1456 | if ((delta > th->th_counter->tc_frequency / 2) && |
---|
1457 | (th->th_scale * delta < ((uint64_t)1 << 63))) { |
---|
1458 | /* The product th_scale * delta just barely overflows. */ |
---|
1459 | th->th_offset.sec++; |
---|
1460 | } |
---|
1461 | bintime_addx(&th->th_offset, th->th_scale * delta); |
---|
1462 | |
---|
1463 | /* |
---|
1464 | * Hardware latching timecounters may not generate interrupts on |
---|
1465 | * PPS events, so instead we poll them. There is a finite risk that |
---|
1466 | * the hardware might capture a count which is later than the one we |
---|
1467 | * got above, and therefore possibly in the next NTP second which might |
---|
1468 | * have a different rate than the current NTP second. It doesn't |
---|
1469 | * matter in practice. |
---|
1470 | */ |
---|
1471 | if (tho->th_counter->tc_poll_pps) |
---|
1472 | tho->th_counter->tc_poll_pps(tho->th_counter); |
---|
1473 | |
---|
1474 | /* |
---|
1475 | * Deal with NTP second processing. The for loop normally |
---|
1476 | * iterates at most once, but in extreme situations it might |
---|
1477 | * keep NTP sane if timeouts are not run for several seconds. |
---|
1478 | * At boot, the time step can be large when the TOD hardware |
---|
1479 | * has been read, so on really large steps, we call |
---|
1480 | * ntp_update_second only twice. We need to call it twice in |
---|
1481 | * case we missed a leap second. |
---|
1482 | */ |
---|
1483 | bt = th->th_offset; |
---|
1484 | bintime_add(&bt, &boottimebin); |
---|
1485 | i = bt.sec - tho->th_microtime.tv_sec; |
---|
1486 | if (i > LARGE_STEP) |
---|
1487 | i = 2; |
---|
1488 | for (; i > 0; i--) { |
---|
1489 | t = bt.sec; |
---|
1490 | ntp_update_second(&th->th_adjustment, &bt.sec); |
---|
1491 | if (bt.sec != t) |
---|
1492 | boottimebin.sec += bt.sec - t; |
---|
1493 | } |
---|
1494 | /* Update the UTC timestamps used by the get*() functions. */ |
---|
1495 | /* XXX shouldn't do this here. Should force non-`get' versions. */ |
---|
1496 | bintime2timeval(&bt, &th->th_microtime); |
---|
1497 | bintime2timespec(&bt, &th->th_nanotime); |
---|
1498 | |
---|
1499 | /* Now is a good time to change timecounters. */ |
---|
1500 | if (th->th_counter != timecounter) { |
---|
1501 | #ifndef __rtems__ |
---|
1502 | #ifndef __arm__ |
---|
1503 | if ((timecounter->tc_flags & TC_FLAGS_C2STOP) != 0) |
---|
1504 | cpu_disable_c2_sleep++; |
---|
1505 | if ((th->th_counter->tc_flags & TC_FLAGS_C2STOP) != 0) |
---|
1506 | cpu_disable_c2_sleep--; |
---|
1507 | #endif |
---|
1508 | #endif /* __rtems__ */ |
---|
1509 | th->th_counter = timecounter; |
---|
1510 | th->th_offset_count = ncount; |
---|
1511 | #ifndef __rtems__ |
---|
1512 | tc_min_ticktock_freq = max(1, timecounter->tc_frequency / |
---|
1513 | (((uint64_t)timecounter->tc_counter_mask + 1) / 3)); |
---|
1514 | #endif /* __rtems__ */ |
---|
1515 | #ifdef FFCLOCK |
---|
1516 | ffclock_change_tc(th); |
---|
1517 | #endif |
---|
1518 | } |
---|
1519 | |
---|
1520 | /*- |
---|
1521 | * Recalculate the scaling factor. We want the number of 1/2^64 |
---|
1522 | * fractions of a second per period of the hardware counter, taking |
---|
1523 | * into account the th_adjustment factor which the NTP PLL/adjtime(2) |
---|
1524 | * processing provides us with. |
---|
1525 | * |
---|
1526 | * The th_adjustment is nanoseconds per second with 32 bit binary |
---|
1527 | * fraction and we want 64 bit binary fraction of second: |
---|
1528 | * |
---|
1529 | * x = a * 2^32 / 10^9 = a * 4.294967296 |
---|
1530 | * |
---|
1531 | * The range of th_adjustment is +/- 5000PPM so inside a 64bit int |
---|
1532 | * we can only multiply by about 850 without overflowing, that |
---|
1533 | * leaves no suitably precise fractions for multiply before divide. |
---|
1534 | * |
---|
1535 | * Divide before multiply with a fraction of 2199/512 results in a |
---|
1536 | * systematic undercompensation of 10PPM of th_adjustment. On a |
---|
1537 | * 5000PPM adjustment this is a 0.05PPM error. This is acceptable. |
---|
1538 | * |
---|
1539 | * We happily sacrifice the lowest of the 64 bits of our result |
---|
1540 | * to the goddess of code clarity. |
---|
1541 | * |
---|
1542 | */ |
---|
1543 | scale = (uint64_t)1 << 63; |
---|
1544 | scale += (th->th_adjustment / 1024) * 2199; |
---|
1545 | scale /= th->th_counter->tc_frequency; |
---|
1546 | th->th_scale = scale * 2; |
---|
1547 | |
---|
1548 | /* |
---|
1549 | * Now that the struct timehands is again consistent, set the new |
---|
1550 | * generation number, making sure to not make it zero. |
---|
1551 | */ |
---|
1552 | if (++ogen == 0) |
---|
1553 | ogen = 1; |
---|
1554 | tc_setgen(th, ogen); |
---|
1555 | |
---|
1556 | /* Go live with the new struct timehands. */ |
---|
1557 | #ifdef FFCLOCK |
---|
1558 | switch (sysclock_active) { |
---|
1559 | case SYSCLOCK_FBCK: |
---|
1560 | #endif |
---|
1561 | time_second = th->th_microtime.tv_sec; |
---|
1562 | time_uptime = th->th_offset.sec; |
---|
1563 | #ifdef FFCLOCK |
---|
1564 | break; |
---|
1565 | case SYSCLOCK_FFWD: |
---|
1566 | time_second = fftimehands->tick_time_lerp.sec; |
---|
1567 | time_uptime = fftimehands->tick_time_lerp.sec - ffclock_boottime.sec; |
---|
1568 | break; |
---|
1569 | } |
---|
1570 | #endif |
---|
1571 | |
---|
1572 | #if defined(RTEMS_SMP) |
---|
1573 | timehands = th; |
---|
1574 | #endif |
---|
1575 | #ifndef __rtems__ |
---|
1576 | timekeep_push_vdso(); |
---|
1577 | #endif /* __rtems__ */ |
---|
1578 | #ifdef __rtems__ |
---|
1579 | _Timecounter_Release(lock_context); |
---|
1580 | #endif /* __rtems__ */ |
---|
1581 | } |
---|
1582 | |
---|
1583 | #ifndef __rtems__ |
---|
1584 | /* Report or change the active timecounter hardware. */ |
---|
1585 | static int |
---|
1586 | sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS) |
---|
1587 | { |
---|
1588 | char newname[32]; |
---|
1589 | struct timecounter *newtc, *tc; |
---|
1590 | int error; |
---|
1591 | |
---|
1592 | tc = timecounter; |
---|
1593 | strlcpy(newname, tc->tc_name, sizeof(newname)); |
---|
1594 | |
---|
1595 | error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req); |
---|
1596 | if (error != 0 || req->newptr == NULL || |
---|
1597 | strcmp(newname, tc->tc_name) == 0) |
---|
1598 | return (error); |
---|
1599 | for (newtc = timecounters; newtc != NULL; newtc = newtc->tc_next) { |
---|
1600 | if (strcmp(newname, newtc->tc_name) != 0) |
---|
1601 | continue; |
---|
1602 | |
---|
1603 | /* Warm up new timecounter. */ |
---|
1604 | (void)newtc->tc_get_timecount(newtc); |
---|
1605 | (void)newtc->tc_get_timecount(newtc); |
---|
1606 | |
---|
1607 | timecounter = newtc; |
---|
1608 | |
---|
1609 | /* |
---|
1610 | * The vdso timehands update is deferred until the next |
---|
1611 | * 'tc_windup()'. |
---|
1612 | * |
---|
1613 | * This is prudent given that 'timekeep_push_vdso()' does not |
---|
1614 | * use any locking and that it can be called in hard interrupt |
---|
1615 | * context via 'tc_windup()'. |
---|
1616 | */ |
---|
1617 | return (0); |
---|
1618 | } |
---|
1619 | return (EINVAL); |
---|
1620 | } |
---|
1621 | |
---|
1622 | SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW, |
---|
1623 | 0, 0, sysctl_kern_timecounter_hardware, "A", |
---|
1624 | "Timecounter hardware selected"); |
---|
1625 | |
---|
1626 | |
---|
1627 | /* Report or change the active timecounter hardware. */ |
---|
1628 | static int |
---|
1629 | sysctl_kern_timecounter_choice(SYSCTL_HANDLER_ARGS) |
---|
1630 | { |
---|
1631 | struct sbuf sb; |
---|
1632 | struct timecounter *tc; |
---|
1633 | int error; |
---|
1634 | |
---|
1635 | sbuf_new_for_sysctl(&sb, NULL, 0, req); |
---|
1636 | for (tc = timecounters; tc != NULL; tc = tc->tc_next) { |
---|
1637 | if (tc != timecounters) |
---|
1638 | sbuf_putc(&sb, ' '); |
---|
1639 | sbuf_printf(&sb, "%s(%d)", tc->tc_name, tc->tc_quality); |
---|
1640 | } |
---|
1641 | error = sbuf_finish(&sb); |
---|
1642 | sbuf_delete(&sb); |
---|
1643 | return (error); |
---|
1644 | } |
---|
1645 | |
---|
1646 | SYSCTL_PROC(_kern_timecounter, OID_AUTO, choice, CTLTYPE_STRING | CTLFLAG_RD, |
---|
1647 | 0, 0, sysctl_kern_timecounter_choice, "A", "Timecounter hardware detected"); |
---|
1648 | #endif /* __rtems__ */ |
---|
1649 | |
---|
1650 | #ifndef __rtems__ |
---|
1651 | /* |
---|
1652 | * RFC 2783 PPS-API implementation. |
---|
1653 | */ |
---|
1654 | |
---|
1655 | /* |
---|
1656 | * Return true if the driver is aware of the abi version extensions in the |
---|
1657 | * pps_state structure, and it supports at least the given abi version number. |
---|
1658 | */ |
---|
1659 | static inline int |
---|
1660 | abi_aware(struct pps_state *pps, int vers) |
---|
1661 | { |
---|
1662 | |
---|
1663 | return ((pps->kcmode & KCMODE_ABIFLAG) && pps->driver_abi >= vers); |
---|
1664 | } |
---|
1665 | |
---|
1666 | static int |
---|
1667 | pps_fetch(struct pps_fetch_args *fapi, struct pps_state *pps) |
---|
1668 | { |
---|
1669 | int err, timo; |
---|
1670 | pps_seq_t aseq, cseq; |
---|
1671 | struct timeval tv; |
---|
1672 | |
---|
1673 | if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) |
---|
1674 | return (EINVAL); |
---|
1675 | |
---|
1676 | /* |
---|
1677 | * If no timeout is requested, immediately return whatever values were |
---|
1678 | * most recently captured. If timeout seconds is -1, that's a request |
---|
1679 | * to block without a timeout. WITNESS won't let us sleep forever |
---|
1680 | * without a lock (we really don't need a lock), so just repeatedly |
---|
1681 | * sleep a long time. |
---|
1682 | */ |
---|
1683 | if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) { |
---|
1684 | if (fapi->timeout.tv_sec == -1) |
---|
1685 | timo = 0x7fffffff; |
---|
1686 | else { |
---|
1687 | tv.tv_sec = fapi->timeout.tv_sec; |
---|
1688 | tv.tv_usec = fapi->timeout.tv_nsec / 1000; |
---|
1689 | timo = tvtohz(&tv); |
---|
1690 | } |
---|
1691 | aseq = pps->ppsinfo.assert_sequence; |
---|
1692 | cseq = pps->ppsinfo.clear_sequence; |
---|
1693 | while (aseq == pps->ppsinfo.assert_sequence && |
---|
1694 | cseq == pps->ppsinfo.clear_sequence) { |
---|
1695 | if (abi_aware(pps, 1) && pps->driver_mtx != NULL) { |
---|
1696 | if (pps->flags & PPSFLAG_MTX_SPIN) { |
---|
1697 | err = msleep_spin(pps, pps->driver_mtx, |
---|
1698 | "ppsfch", timo); |
---|
1699 | } else { |
---|
1700 | err = msleep(pps, pps->driver_mtx, PCATCH, |
---|
1701 | "ppsfch", timo); |
---|
1702 | } |
---|
1703 | } else { |
---|
1704 | err = tsleep(pps, PCATCH, "ppsfch", timo); |
---|
1705 | } |
---|
1706 | if (err == EWOULDBLOCK && fapi->timeout.tv_sec == -1) { |
---|
1707 | continue; |
---|
1708 | } else if (err != 0) { |
---|
1709 | return (err); |
---|
1710 | } |
---|
1711 | } |
---|
1712 | } |
---|
1713 | |
---|
1714 | pps->ppsinfo.current_mode = pps->ppsparam.mode; |
---|
1715 | fapi->pps_info_buf = pps->ppsinfo; |
---|
1716 | |
---|
1717 | return (0); |
---|
1718 | } |
---|
1719 | |
---|
1720 | int |
---|
1721 | pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) |
---|
1722 | { |
---|
1723 | pps_params_t *app; |
---|
1724 | struct pps_fetch_args *fapi; |
---|
1725 | #ifdef FFCLOCK |
---|
1726 | struct pps_fetch_ffc_args *fapi_ffc; |
---|
1727 | #endif |
---|
1728 | #ifdef PPS_SYNC |
---|
1729 | struct pps_kcbind_args *kapi; |
---|
1730 | #endif |
---|
1731 | |
---|
1732 | KASSERT(pps != NULL, ("NULL pps pointer in pps_ioctl")); |
---|
1733 | switch (cmd) { |
---|
1734 | case PPS_IOC_CREATE: |
---|
1735 | return (0); |
---|
1736 | case PPS_IOC_DESTROY: |
---|
1737 | return (0); |
---|
1738 | case PPS_IOC_SETPARAMS: |
---|
1739 | app = (pps_params_t *)data; |
---|
1740 | if (app->mode & ~pps->ppscap) |
---|
1741 | return (EINVAL); |
---|
1742 | #ifdef FFCLOCK |
---|
1743 | /* Ensure only a single clock is selected for ffc timestamp. */ |
---|
1744 | if ((app->mode & PPS_TSCLK_MASK) == PPS_TSCLK_MASK) |
---|
1745 | return (EINVAL); |
---|
1746 | #endif |
---|
1747 | pps->ppsparam = *app; |
---|
1748 | return (0); |
---|
1749 | case PPS_IOC_GETPARAMS: |
---|
1750 | app = (pps_params_t *)data; |
---|
1751 | *app = pps->ppsparam; |
---|
1752 | app->api_version = PPS_API_VERS_1; |
---|
1753 | return (0); |
---|
1754 | case PPS_IOC_GETCAP: |
---|
1755 | *(int*)data = pps->ppscap; |
---|
1756 | return (0); |
---|
1757 | case PPS_IOC_FETCH: |
---|
1758 | fapi = (struct pps_fetch_args *)data; |
---|
1759 | return (pps_fetch(fapi, pps)); |
---|
1760 | #ifdef FFCLOCK |
---|
1761 | case PPS_IOC_FETCH_FFCOUNTER: |
---|
1762 | fapi_ffc = (struct pps_fetch_ffc_args *)data; |
---|
1763 | if (fapi_ffc->tsformat && fapi_ffc->tsformat != |
---|
1764 | PPS_TSFMT_TSPEC) |
---|
1765 | return (EINVAL); |
---|
1766 | if (fapi_ffc->timeout.tv_sec || fapi_ffc->timeout.tv_nsec) |
---|
1767 | return (EOPNOTSUPP); |
---|
1768 | pps->ppsinfo_ffc.current_mode = pps->ppsparam.mode; |
---|
1769 | fapi_ffc->pps_info_buf_ffc = pps->ppsinfo_ffc; |
---|
1770 | /* Overwrite timestamps if feedback clock selected. */ |
---|
1771 | switch (pps->ppsparam.mode & PPS_TSCLK_MASK) { |
---|
1772 | case PPS_TSCLK_FBCK: |
---|
1773 | fapi_ffc->pps_info_buf_ffc.assert_timestamp = |
---|
1774 | pps->ppsinfo.assert_timestamp; |
---|
1775 | fapi_ffc->pps_info_buf_ffc.clear_timestamp = |
---|
1776 | pps->ppsinfo.clear_timestamp; |
---|
1777 | break; |
---|
1778 | case PPS_TSCLK_FFWD: |
---|
1779 | break; |
---|
1780 | default: |
---|
1781 | break; |
---|
1782 | } |
---|
1783 | return (0); |
---|
1784 | #endif /* FFCLOCK */ |
---|
1785 | case PPS_IOC_KCBIND: |
---|
1786 | #ifdef PPS_SYNC |
---|
1787 | kapi = (struct pps_kcbind_args *)data; |
---|
1788 | /* XXX Only root should be able to do this */ |
---|
1789 | if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) |
---|
1790 | return (EINVAL); |
---|
1791 | if (kapi->kernel_consumer != PPS_KC_HARDPPS) |
---|
1792 | return (EINVAL); |
---|
1793 | if (kapi->edge & ~pps->ppscap) |
---|
1794 | return (EINVAL); |
---|
1795 | pps->kcmode = (kapi->edge & KCMODE_EDGEMASK) | |
---|
1796 | (pps->kcmode & KCMODE_ABIFLAG); |
---|
1797 | return (0); |
---|
1798 | #else |
---|
1799 | return (EOPNOTSUPP); |
---|
1800 | #endif |
---|
1801 | default: |
---|
1802 | return (ENOIOCTL); |
---|
1803 | } |
---|
1804 | } |
---|
1805 | |
---|
1806 | void |
---|
1807 | pps_init(struct pps_state *pps) |
---|
1808 | { |
---|
1809 | pps->ppscap |= PPS_TSFMT_TSPEC | PPS_CANWAIT; |
---|
1810 | if (pps->ppscap & PPS_CAPTUREASSERT) |
---|
1811 | pps->ppscap |= PPS_OFFSETASSERT; |
---|
1812 | if (pps->ppscap & PPS_CAPTURECLEAR) |
---|
1813 | pps->ppscap |= PPS_OFFSETCLEAR; |
---|
1814 | #ifdef FFCLOCK |
---|
1815 | pps->ppscap |= PPS_TSCLK_MASK; |
---|
1816 | #endif |
---|
1817 | pps->kcmode &= ~KCMODE_ABIFLAG; |
---|
1818 | } |
---|
1819 | |
---|
1820 | void |
---|
1821 | pps_init_abi(struct pps_state *pps) |
---|
1822 | { |
---|
1823 | |
---|
1824 | pps_init(pps); |
---|
1825 | if (pps->driver_abi > 0) { |
---|
1826 | pps->kcmode |= KCMODE_ABIFLAG; |
---|
1827 | pps->kernel_abi = PPS_ABI_VERSION; |
---|
1828 | } |
---|
1829 | } |
---|
1830 | |
---|
1831 | void |
---|
1832 | pps_capture(struct pps_state *pps) |
---|
1833 | { |
---|
1834 | struct timehands *th; |
---|
1835 | |
---|
1836 | KASSERT(pps != NULL, ("NULL pps pointer in pps_capture")); |
---|
1837 | th = timehands; |
---|
1838 | pps->capgen = tc_getgen(th); |
---|
1839 | pps->capth = th; |
---|
1840 | #ifdef FFCLOCK |
---|
1841 | pps->capffth = fftimehands; |
---|
1842 | #endif |
---|
1843 | pps->capcount = th->th_counter->tc_get_timecount(th->th_counter); |
---|
1844 | if (pps->capgen != tc_getgen(th)) |
---|
1845 | pps->capgen = 0; |
---|
1846 | } |
---|
1847 | |
---|
1848 | void |
---|
1849 | pps_event(struct pps_state *pps, int event) |
---|
1850 | { |
---|
1851 | struct bintime bt; |
---|
1852 | struct timespec ts, *tsp, *osp; |
---|
1853 | uint32_t tcount, *pcount; |
---|
1854 | int foff, fhard; |
---|
1855 | pps_seq_t *pseq; |
---|
1856 | #ifdef FFCLOCK |
---|
1857 | struct timespec *tsp_ffc; |
---|
1858 | pps_seq_t *pseq_ffc; |
---|
1859 | ffcounter *ffcount; |
---|
1860 | #endif |
---|
1861 | |
---|
1862 | KASSERT(pps != NULL, ("NULL pps pointer in pps_event")); |
---|
1863 | /* If the timecounter was wound up underneath us, bail out. */ |
---|
1864 | if (pps->capgen == 0 || pps->capgen != tc_getgen(pps->capth)) |
---|
1865 | return; |
---|
1866 | |
---|
1867 | /* Things would be easier with arrays. */ |
---|
1868 | if (event == PPS_CAPTUREASSERT) { |
---|
1869 | tsp = &pps->ppsinfo.assert_timestamp; |
---|
1870 | osp = &pps->ppsparam.assert_offset; |
---|
1871 | foff = pps->ppsparam.mode & PPS_OFFSETASSERT; |
---|
1872 | fhard = pps->kcmode & PPS_CAPTUREASSERT; |
---|
1873 | pcount = &pps->ppscount[0]; |
---|
1874 | pseq = &pps->ppsinfo.assert_sequence; |
---|
1875 | #ifdef FFCLOCK |
---|
1876 | ffcount = &pps->ppsinfo_ffc.assert_ffcount; |
---|
1877 | tsp_ffc = &pps->ppsinfo_ffc.assert_timestamp; |
---|
1878 | pseq_ffc = &pps->ppsinfo_ffc.assert_sequence; |
---|
1879 | #endif |
---|
1880 | } else { |
---|
1881 | tsp = &pps->ppsinfo.clear_timestamp; |
---|
1882 | osp = &pps->ppsparam.clear_offset; |
---|
1883 | foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; |
---|
1884 | fhard = pps->kcmode & PPS_CAPTURECLEAR; |
---|
1885 | pcount = &pps->ppscount[1]; |
---|
1886 | pseq = &pps->ppsinfo.clear_sequence; |
---|
1887 | #ifdef FFCLOCK |
---|
1888 | ffcount = &pps->ppsinfo_ffc.clear_ffcount; |
---|
1889 | tsp_ffc = &pps->ppsinfo_ffc.clear_timestamp; |
---|
1890 | pseq_ffc = &pps->ppsinfo_ffc.clear_sequence; |
---|
1891 | #endif |
---|
1892 | } |
---|
1893 | |
---|
1894 | /* |
---|
1895 | * If the timecounter changed, we cannot compare the count values, so |
---|
1896 | * we have to drop the rest of the PPS-stuff until the next event. |
---|
1897 | */ |
---|
1898 | if (pps->ppstc != pps->capth->th_counter) { |
---|
1899 | pps->ppstc = pps->capth->th_counter; |
---|
1900 | *pcount = pps->capcount; |
---|
1901 | pps->ppscount[2] = pps->capcount; |
---|
1902 | return; |
---|
1903 | } |
---|
1904 | |
---|
1905 | /* Convert the count to a timespec. */ |
---|
1906 | tcount = pps->capcount - pps->capth->th_offset_count; |
---|
1907 | tcount &= pps->capth->th_counter->tc_counter_mask; |
---|
1908 | bt = pps->capth->th_offset; |
---|
1909 | bintime_addx(&bt, pps->capth->th_scale * tcount); |
---|
1910 | bintime_add(&bt, &boottimebin); |
---|
1911 | bintime2timespec(&bt, &ts); |
---|
1912 | |
---|
1913 | /* If the timecounter was wound up underneath us, bail out. */ |
---|
1914 | if (pps->capgen != tc_getgen(pps->capth)) |
---|
1915 | return; |
---|
1916 | |
---|
1917 | *pcount = pps->capcount; |
---|
1918 | (*pseq)++; |
---|
1919 | *tsp = ts; |
---|
1920 | |
---|
1921 | if (foff) { |
---|
1922 | timespecadd(tsp, osp); |
---|
1923 | if (tsp->tv_nsec < 0) { |
---|
1924 | tsp->tv_nsec += 1000000000; |
---|
1925 | tsp->tv_sec -= 1; |
---|
1926 | } |
---|
1927 | } |
---|
1928 | |
---|
1929 | #ifdef FFCLOCK |
---|
1930 | *ffcount = pps->capffth->tick_ffcount + tcount; |
---|
1931 | bt = pps->capffth->tick_time; |
---|
1932 | ffclock_convert_delta(tcount, pps->capffth->cest.period, &bt); |
---|
1933 | bintime_add(&bt, &pps->capffth->tick_time); |
---|
1934 | bintime2timespec(&bt, &ts); |
---|
1935 | (*pseq_ffc)++; |
---|
1936 | *tsp_ffc = ts; |
---|
1937 | #endif |
---|
1938 | |
---|
1939 | #ifdef PPS_SYNC |
---|
1940 | if (fhard) { |
---|
1941 | uint64_t scale; |
---|
1942 | |
---|
1943 | /* |
---|
1944 | * Feed the NTP PLL/FLL. |
---|
1945 | * The FLL wants to know how many (hardware) nanoseconds |
---|
1946 | * elapsed since the previous event. |
---|
1947 | */ |
---|
1948 | tcount = pps->capcount - pps->ppscount[2]; |
---|
1949 | pps->ppscount[2] = pps->capcount; |
---|
1950 | tcount &= pps->capth->th_counter->tc_counter_mask; |
---|
1951 | scale = (uint64_t)1 << 63; |
---|
1952 | scale /= pps->capth->th_counter->tc_frequency; |
---|
1953 | scale *= 2; |
---|
1954 | bt.sec = 0; |
---|
1955 | bt.frac = 0; |
---|
1956 | bintime_addx(&bt, scale * tcount); |
---|
1957 | bintime2timespec(&bt, &ts); |
---|
1958 | hardpps(tsp, ts.tv_nsec + 1000000000 * ts.tv_sec); |
---|
1959 | } |
---|
1960 | #endif |
---|
1961 | |
---|
1962 | /* Wakeup anyone sleeping in pps_fetch(). */ |
---|
1963 | wakeup(pps); |
---|
1964 | } |
---|
1965 | #else /* __rtems__ */ |
---|
1966 | /* FIXME: https://devel.rtems.org/ticket/2349 */ |
---|
1967 | #endif /* __rtems__ */ |
---|
1968 | |
---|
1969 | /* |
---|
1970 | * Timecounters need to be updated every so often to prevent the hardware |
---|
1971 | * counter from overflowing. Updating also recalculates the cached values |
---|
1972 | * used by the get*() family of functions, so their precision depends on |
---|
1973 | * the update frequency. |
---|
1974 | */ |
---|
1975 | |
---|
1976 | #ifndef __rtems__ |
---|
1977 | static int tc_tick; |
---|
1978 | SYSCTL_INT(_kern_timecounter, OID_AUTO, tick, CTLFLAG_RD, &tc_tick, 0, |
---|
1979 | "Approximate number of hardclock ticks in a millisecond"); |
---|
1980 | #endif /* __rtems__ */ |
---|
1981 | |
---|
1982 | #ifndef __rtems__ |
---|
1983 | void |
---|
1984 | tc_ticktock(int cnt) |
---|
1985 | { |
---|
1986 | static int count; |
---|
1987 | |
---|
1988 | count += cnt; |
---|
1989 | if (count < tc_tick) |
---|
1990 | return; |
---|
1991 | count = 0; |
---|
1992 | tc_windup(); |
---|
1993 | } |
---|
1994 | #else /* __rtems__ */ |
---|
1995 | void |
---|
1996 | _Timecounter_Tick(void) |
---|
1997 | { |
---|
1998 | Per_CPU_Control *cpu_self = _Per_CPU_Get(); |
---|
1999 | |
---|
2000 | if (_Per_CPU_Is_boot_processor(cpu_self)) { |
---|
2001 | tc_windup(); |
---|
2002 | } |
---|
2003 | |
---|
2004 | _Watchdog_Tick(cpu_self); |
---|
2005 | } |
---|
2006 | |
---|
2007 | void |
---|
2008 | _Timecounter_Tick_simple(uint32_t delta, uint32_t offset, |
---|
2009 | ISR_lock_Context *lock_context) |
---|
2010 | { |
---|
2011 | struct bintime bt; |
---|
2012 | struct timehands *th; |
---|
2013 | uint32_t ogen; |
---|
2014 | |
---|
2015 | th = timehands; |
---|
2016 | ogen = th->th_generation; |
---|
2017 | th->th_offset_count = offset; |
---|
2018 | bintime_addx(&th->th_offset, th->th_scale * delta); |
---|
2019 | |
---|
2020 | bt = th->th_offset; |
---|
2021 | bintime_add(&bt, &boottimebin); |
---|
2022 | |
---|
2023 | /* Update the UTC timestamps used by the get*() functions. */ |
---|
2024 | /* XXX shouldn't do this here. Should force non-`get' versions. */ |
---|
2025 | bintime2timeval(&bt, &th->th_microtime); |
---|
2026 | bintime2timespec(&bt, &th->th_nanotime); |
---|
2027 | |
---|
2028 | /* |
---|
2029 | * Now that the struct timehands is again consistent, set the new |
---|
2030 | * generation number, making sure to not make it zero. |
---|
2031 | */ |
---|
2032 | if (++ogen == 0) |
---|
2033 | ogen = 1; |
---|
2034 | th->th_generation = ogen; |
---|
2035 | |
---|
2036 | /* Go live with the new struct timehands. */ |
---|
2037 | time_second = th->th_microtime.tv_sec; |
---|
2038 | time_uptime = th->th_offset.sec; |
---|
2039 | |
---|
2040 | _Timecounter_Release(lock_context); |
---|
2041 | |
---|
2042 | _Watchdog_Tick(_Per_CPU_Get_snapshot()); |
---|
2043 | } |
---|
2044 | #endif /* __rtems__ */ |
---|
2045 | |
---|
2046 | #ifndef __rtems__ |
---|
2047 | static void __inline |
---|
2048 | tc_adjprecision(void) |
---|
2049 | { |
---|
2050 | int t; |
---|
2051 | |
---|
2052 | if (tc_timepercentage > 0) { |
---|
2053 | t = (99 + tc_timepercentage) / tc_timepercentage; |
---|
2054 | tc_precexp = fls(t + (t >> 1)) - 1; |
---|
2055 | FREQ2BT(hz / tc_tick, &bt_timethreshold); |
---|
2056 | FREQ2BT(hz, &bt_tickthreshold); |
---|
2057 | bintime_shift(&bt_timethreshold, tc_precexp); |
---|
2058 | bintime_shift(&bt_tickthreshold, tc_precexp); |
---|
2059 | } else { |
---|
2060 | tc_precexp = 31; |
---|
2061 | bt_timethreshold.sec = INT_MAX; |
---|
2062 | bt_timethreshold.frac = ~(uint64_t)0; |
---|
2063 | bt_tickthreshold = bt_timethreshold; |
---|
2064 | } |
---|
2065 | sbt_timethreshold = bttosbt(bt_timethreshold); |
---|
2066 | sbt_tickthreshold = bttosbt(bt_tickthreshold); |
---|
2067 | } |
---|
2068 | #endif /* __rtems__ */ |
---|
2069 | |
---|
2070 | #ifndef __rtems__ |
---|
2071 | static int |
---|
2072 | sysctl_kern_timecounter_adjprecision(SYSCTL_HANDLER_ARGS) |
---|
2073 | { |
---|
2074 | int error, val; |
---|
2075 | |
---|
2076 | val = tc_timepercentage; |
---|
2077 | error = sysctl_handle_int(oidp, &val, 0, req); |
---|
2078 | if (error != 0 || req->newptr == NULL) |
---|
2079 | return (error); |
---|
2080 | tc_timepercentage = val; |
---|
2081 | if (cold) |
---|
2082 | goto done; |
---|
2083 | tc_adjprecision(); |
---|
2084 | done: |
---|
2085 | return (0); |
---|
2086 | } |
---|
2087 | |
---|
2088 | static void |
---|
2089 | inittimecounter(void *dummy) |
---|
2090 | { |
---|
2091 | u_int p; |
---|
2092 | int tick_rate; |
---|
2093 | |
---|
2094 | /* |
---|
2095 | * Set the initial timeout to |
---|
2096 | * max(1, <approx. number of hardclock ticks in a millisecond>). |
---|
2097 | * People should probably not use the sysctl to set the timeout |
---|
2098 | * to smaller than its inital value, since that value is the |
---|
2099 | * smallest reasonable one. If they want better timestamps they |
---|
2100 | * should use the non-"get"* functions. |
---|
2101 | */ |
---|
2102 | if (hz > 1000) |
---|
2103 | tc_tick = (hz + 500) / 1000; |
---|
2104 | else |
---|
2105 | tc_tick = 1; |
---|
2106 | tc_adjprecision(); |
---|
2107 | FREQ2BT(hz, &tick_bt); |
---|
2108 | tick_sbt = bttosbt(tick_bt); |
---|
2109 | tick_rate = hz / tc_tick; |
---|
2110 | FREQ2BT(tick_rate, &tc_tick_bt); |
---|
2111 | tc_tick_sbt = bttosbt(tc_tick_bt); |
---|
2112 | p = (tc_tick * 1000000) / hz; |
---|
2113 | printf("Timecounters tick every %d.%03u msec\n", p / 1000, p % 1000); |
---|
2114 | |
---|
2115 | #ifdef FFCLOCK |
---|
2116 | ffclock_init(); |
---|
2117 | #endif |
---|
2118 | /* warm up new timecounter (again) and get rolling. */ |
---|
2119 | (void)timecounter->tc_get_timecount(timecounter); |
---|
2120 | (void)timecounter->tc_get_timecount(timecounter); |
---|
2121 | tc_windup(); |
---|
2122 | } |
---|
2123 | |
---|
2124 | SYSINIT(timecounter, SI_SUB_CLOCKS, SI_ORDER_SECOND, inittimecounter, NULL); |
---|
2125 | |
---|
2126 | /* Cpu tick handling -------------------------------------------------*/ |
---|
2127 | |
---|
2128 | static int cpu_tick_variable; |
---|
2129 | static uint64_t cpu_tick_frequency; |
---|
2130 | |
---|
2131 | static uint64_t |
---|
2132 | tc_cpu_ticks(void) |
---|
2133 | { |
---|
2134 | static uint64_t base; |
---|
2135 | static unsigned last; |
---|
2136 | unsigned u; |
---|
2137 | struct timecounter *tc; |
---|
2138 | |
---|
2139 | tc = timehands->th_counter; |
---|
2140 | u = tc->tc_get_timecount(tc) & tc->tc_counter_mask; |
---|
2141 | if (u < last) |
---|
2142 | base += (uint64_t)tc->tc_counter_mask + 1; |
---|
2143 | last = u; |
---|
2144 | return (u + base); |
---|
2145 | } |
---|
2146 | |
---|
2147 | void |
---|
2148 | cpu_tick_calibration(void) |
---|
2149 | { |
---|
2150 | static time_t last_calib; |
---|
2151 | |
---|
2152 | if (time_uptime != last_calib && !(time_uptime & 0xf)) { |
---|
2153 | cpu_tick_calibrate(0); |
---|
2154 | last_calib = time_uptime; |
---|
2155 | } |
---|
2156 | } |
---|
2157 | |
---|
2158 | /* |
---|
2159 | * This function gets called every 16 seconds on only one designated |
---|
2160 | * CPU in the system from hardclock() via cpu_tick_calibration()(). |
---|
2161 | * |
---|
2162 | * Whenever the real time clock is stepped we get called with reset=1 |
---|
2163 | * to make sure we handle suspend/resume and similar events correctly. |
---|
2164 | */ |
---|
2165 | |
---|
2166 | static void |
---|
2167 | cpu_tick_calibrate(int reset) |
---|
2168 | { |
---|
2169 | static uint64_t c_last; |
---|
2170 | uint64_t c_this, c_delta; |
---|
2171 | static struct bintime t_last; |
---|
2172 | struct bintime t_this, t_delta; |
---|
2173 | uint32_t divi; |
---|
2174 | |
---|
2175 | if (reset) { |
---|
2176 | /* The clock was stepped, abort & reset */ |
---|
2177 | t_last.sec = 0; |
---|
2178 | return; |
---|
2179 | } |
---|
2180 | |
---|
2181 | /* we don't calibrate fixed rate cputicks */ |
---|
2182 | if (!cpu_tick_variable) |
---|
2183 | return; |
---|
2184 | |
---|
2185 | getbinuptime(&t_this); |
---|
2186 | c_this = cpu_ticks(); |
---|
2187 | if (t_last.sec != 0) { |
---|
2188 | c_delta = c_this - c_last; |
---|
2189 | t_delta = t_this; |
---|
2190 | bintime_sub(&t_delta, &t_last); |
---|
2191 | /* |
---|
2192 | * Headroom: |
---|
2193 | * 2^(64-20) / 16[s] = |
---|
2194 | * 2^(44) / 16[s] = |
---|
2195 | * 17.592.186.044.416 / 16 = |
---|
2196 | * 1.099.511.627.776 [Hz] |
---|
2197 | */ |
---|
2198 | divi = t_delta.sec << 20; |
---|
2199 | divi |= t_delta.frac >> (64 - 20); |
---|
2200 | c_delta <<= 20; |
---|
2201 | c_delta /= divi; |
---|
2202 | if (c_delta > cpu_tick_frequency) { |
---|
2203 | if (0 && bootverbose) |
---|
2204 | printf("cpu_tick increased to %ju Hz\n", |
---|
2205 | c_delta); |
---|
2206 | cpu_tick_frequency = c_delta; |
---|
2207 | } |
---|
2208 | } |
---|
2209 | c_last = c_this; |
---|
2210 | t_last = t_this; |
---|
2211 | } |
---|
2212 | |
---|
2213 | void |
---|
2214 | set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var) |
---|
2215 | { |
---|
2216 | |
---|
2217 | if (func == NULL) { |
---|
2218 | cpu_ticks = tc_cpu_ticks; |
---|
2219 | } else { |
---|
2220 | cpu_tick_frequency = freq; |
---|
2221 | cpu_tick_variable = var; |
---|
2222 | cpu_ticks = func; |
---|
2223 | } |
---|
2224 | } |
---|
2225 | |
---|
2226 | uint64_t |
---|
2227 | cpu_tickrate(void) |
---|
2228 | { |
---|
2229 | |
---|
2230 | if (cpu_ticks == tc_cpu_ticks) |
---|
2231 | return (tc_getfrequency()); |
---|
2232 | return (cpu_tick_frequency); |
---|
2233 | } |
---|
2234 | |
---|
2235 | /* |
---|
2236 | * We need to be slightly careful converting cputicks to microseconds. |
---|
2237 | * There is plenty of margin in 64 bits of microseconds (half a million |
---|
2238 | * years) and in 64 bits at 4 GHz (146 years), but if we do a multiply |
---|
2239 | * before divide conversion (to retain precision) we find that the |
---|
2240 | * margin shrinks to 1.5 hours (one millionth of 146y). |
---|
2241 | * With a three prong approach we never lose significant bits, no |
---|
2242 | * matter what the cputick rate and length of timeinterval is. |
---|
2243 | */ |
---|
2244 | |
---|
2245 | uint64_t |
---|
2246 | cputick2usec(uint64_t tick) |
---|
2247 | { |
---|
2248 | |
---|
2249 | if (tick > 18446744073709551LL) /* floor(2^64 / 1000) */ |
---|
2250 | return (tick / (cpu_tickrate() / 1000000LL)); |
---|
2251 | else if (tick > 18446744073709LL) /* floor(2^64 / 1000000) */ |
---|
2252 | return ((tick * 1000LL) / (cpu_tickrate() / 1000LL)); |
---|
2253 | else |
---|
2254 | return ((tick * 1000000LL) / cpu_tickrate()); |
---|
2255 | } |
---|
2256 | |
---|
2257 | cpu_tick_f *cpu_ticks = tc_cpu_ticks; |
---|
2258 | #endif /* __rtems__ */ |
---|
2259 | |
---|
2260 | #ifndef __rtems__ |
---|
2261 | static int vdso_th_enable = 1; |
---|
2262 | static int |
---|
2263 | sysctl_fast_gettime(SYSCTL_HANDLER_ARGS) |
---|
2264 | { |
---|
2265 | int old_vdso_th_enable, error; |
---|
2266 | |
---|
2267 | old_vdso_th_enable = vdso_th_enable; |
---|
2268 | error = sysctl_handle_int(oidp, &old_vdso_th_enable, 0, req); |
---|
2269 | if (error != 0) |
---|
2270 | return (error); |
---|
2271 | vdso_th_enable = old_vdso_th_enable; |
---|
2272 | return (0); |
---|
2273 | } |
---|
2274 | SYSCTL_PROC(_kern_timecounter, OID_AUTO, fast_gettime, |
---|
2275 | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, |
---|
2276 | NULL, 0, sysctl_fast_gettime, "I", "Enable fast time of day"); |
---|
2277 | |
---|
2278 | uint32_t |
---|
2279 | tc_fill_vdso_timehands(struct vdso_timehands *vdso_th) |
---|
2280 | { |
---|
2281 | struct timehands *th; |
---|
2282 | uint32_t enabled; |
---|
2283 | |
---|
2284 | th = timehands; |
---|
2285 | vdso_th->th_algo = VDSO_TH_ALGO_1; |
---|
2286 | vdso_th->th_scale = th->th_scale; |
---|
2287 | vdso_th->th_offset_count = th->th_offset_count; |
---|
2288 | vdso_th->th_counter_mask = th->th_counter->tc_counter_mask; |
---|
2289 | vdso_th->th_offset = th->th_offset; |
---|
2290 | vdso_th->th_boottime = boottimebin; |
---|
2291 | enabled = cpu_fill_vdso_timehands(vdso_th, th->th_counter); |
---|
2292 | if (!vdso_th_enable) |
---|
2293 | enabled = 0; |
---|
2294 | return (enabled); |
---|
2295 | } |
---|
2296 | #endif /* __rtems__ */ |
---|
2297 | |
---|
2298 | #ifdef COMPAT_FREEBSD32 |
---|
2299 | uint32_t |
---|
2300 | tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32) |
---|
2301 | { |
---|
2302 | struct timehands *th; |
---|
2303 | uint32_t enabled; |
---|
2304 | |
---|
2305 | th = timehands; |
---|
2306 | vdso_th32->th_algo = VDSO_TH_ALGO_1; |
---|
2307 | *(uint64_t *)&vdso_th32->th_scale[0] = th->th_scale; |
---|
2308 | vdso_th32->th_offset_count = th->th_offset_count; |
---|
2309 | vdso_th32->th_counter_mask = th->th_counter->tc_counter_mask; |
---|
2310 | vdso_th32->th_offset.sec = th->th_offset.sec; |
---|
2311 | *(uint64_t *)&vdso_th32->th_offset.frac[0] = th->th_offset.frac; |
---|
2312 | vdso_th32->th_boottime.sec = boottimebin.sec; |
---|
2313 | *(uint64_t *)&vdso_th32->th_boottime.frac[0] = boottimebin.frac; |
---|
2314 | enabled = cpu_fill_vdso_timehands32(vdso_th32, th->th_counter); |
---|
2315 | if (!vdso_th_enable) |
---|
2316 | enabled = 0; |
---|
2317 | return (enabled); |
---|
2318 | } |
---|
2319 | #endif |
---|