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subr_rtc.c (330897) subr_rtc.c (331503)
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1990, 1993
6 * The Regents of the University of California.
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.

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50 * support multiple models of such clocks, and generally serves to make the
51 * code more machine-independent.
52 * If the clock in question can also be used as a time counter, the driver
53 * needs to initiate this.
54 * This code is not yet used by all architectures.
55 */
56
57#include <sys/cdefs.h>
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1990, 1993
6 * The Regents of the University of California.
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.

--- 41 unchanged lines hidden (view full) ---

50 * support multiple models of such clocks, and generally serves to make the
51 * code more machine-independent.
52 * If the clock in question can also be used as a time counter, the driver
53 * needs to initiate this.
54 * This code is not yet used by all architectures.
55 */
56
57#include <sys/cdefs.h>
58__FBSDID("$FreeBSD: stable/11/sys/kern/subr_rtc.c 330897 2018-03-14 03:19:51Z eadler $");
58__FBSDID("$FreeBSD: stable/11/sys/kern/subr_rtc.c 331503 2018-03-24 23:01:10Z ian $");
59
60#include "opt_ffclock.h"
61
62#include <sys/param.h>
63#include <sys/systm.h>
64#include <sys/kernel.h>
65#include <sys/bus.h>
66#include <sys/clock.h>

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71#include <sys/taskqueue.h>
72#ifdef FFCLOCK
73#include <sys/timeffc.h>
74#endif
75#include <sys/timetc.h>
76
77#include "clock_if.h"
78
59
60#include "opt_ffclock.h"
61
62#include <sys/param.h>
63#include <sys/systm.h>
64#include <sys/kernel.h>
65#include <sys/bus.h>
66#include <sys/clock.h>

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71#include <sys/taskqueue.h>
72#ifdef FFCLOCK
73#include <sys/timeffc.h>
74#endif
75#include <sys/timetc.h>
76
77#include "clock_if.h"
78
79static int show_io;
80SYSCTL_INT(_debug, OID_AUTO, clock_show_io, CTLFLAG_RWTUN, &show_io, 0,
81 "Enable debug printing of RTC clock I/O; 1=reads, 2=writes, 3=both.");
82
83static int sysctl_clock_do_io(SYSCTL_HANDLER_ARGS);
84SYSCTL_PROC(_debug, OID_AUTO, clock_do_io, CTLTYPE_INT | CTLFLAG_RW,
85 0, 0, sysctl_clock_do_io, "I",
86 "Trigger one-time IO on RTC clocks; 1=read (and discard), 2=write");
87
79/* XXX: should be kern. now, it's no longer machdep. */
80static int disable_rtc_set;
81SYSCTL_INT(_machdep, OID_AUTO, disable_rtc_set, CTLFLAG_RW, &disable_rtc_set,
82 0, "Disallow adjusting time-of-day clock");
83
84/*
85 * An instance of a realtime clock. A list of these tracks all the registered
86 * clocks in the system.

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139 }
140 } else {
141 ts.tv_sec = 0;
142 ts.tv_nsec = 0;
143 }
144 CLOCK_SETTIME(rtc->clockdev, &ts);
145}
146
88/* XXX: should be kern. now, it's no longer machdep. */
89static int disable_rtc_set;
90SYSCTL_INT(_machdep, OID_AUTO, disable_rtc_set, CTLFLAG_RW, &disable_rtc_set,
91 0, "Disallow adjusting time-of-day clock");
92
93/*
94 * An instance of a realtime clock. A list of these tracks all the registered
95 * clocks in the system.

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148 }
149 } else {
150 ts.tv_sec = 0;
151 ts.tv_nsec = 0;
152 }
153 CLOCK_SETTIME(rtc->clockdev, &ts);
154}
155
156static void
157clock_dbgprint_hdr(device_t dev, int rw)
158{
159 struct timespec now;
160
161 getnanotime(&now);
162 device_printf(dev, "%s at ", (rw & CLOCK_DBG_READ) ? "read " : "write");
163 clock_print_ts(&now, 9);
164 printf(": ");
165}
166
147void
167void
168clock_dbgprint_bcd(device_t dev, int rw, const struct bcd_clocktime *bct)
169{
170
171 if (show_io & rw) {
172 clock_dbgprint_hdr(dev, rw);
173 clock_print_bcd(bct, 9);
174 printf("\n");
175 }
176}
177
178void
179clock_dbgprint_ct(device_t dev, int rw, const struct clocktime *ct)
180{
181
182 if (show_io & rw) {
183 clock_dbgprint_hdr(dev, rw);
184 clock_print_ct(ct, 9);
185 printf("\n");
186 }
187}
188
189void
190clock_dbgprint_err(device_t dev, int rw, int err)
191{
192
193 if (show_io & rw) {
194 clock_dbgprint_hdr(dev, rw);
195 printf("error = %d\n", err);
196 }
197}
198
199void
200clock_dbgprint_ts(device_t dev, int rw, const struct timespec *ts)
201{
202
203 if (show_io & rw) {
204 clock_dbgprint_hdr(dev, rw);
205 clock_print_ts(ts, 9);
206 printf("\n");
207 }
208}
209
210void
148clock_register_flags(device_t clockdev, long resolution, int flags)
149{
150 struct rtc_instance *rtc, *newrtc;
151
152 newrtc = malloc(sizeof(*newrtc), M_DEVBUF, M_WAITOK);
153 newrtc->clockdev = clockdev;
154 newrtc->resolution = (int)resolution;
155 newrtc->flags = flags;

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198 LIST_REMOVE(rtc, rtc_entries);
199 break;
200 }
201 }
202 sx_xunlock(&rtc_list_lock);
203 if (rtc != NULL) {
204 taskqueue_cancel_timeout(taskqueue_thread, &rtc->stask, NULL);
205 taskqueue_drain_timeout(taskqueue_thread, &rtc->stask);
211clock_register_flags(device_t clockdev, long resolution, int flags)
212{
213 struct rtc_instance *rtc, *newrtc;
214
215 newrtc = malloc(sizeof(*newrtc), M_DEVBUF, M_WAITOK);
216 newrtc->clockdev = clockdev;
217 newrtc->resolution = (int)resolution;
218 newrtc->flags = flags;

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261 LIST_REMOVE(rtc, rtc_entries);
262 break;
263 }
264 }
265 sx_xunlock(&rtc_list_lock);
266 if (rtc != NULL) {
267 taskqueue_cancel_timeout(taskqueue_thread, &rtc->stask, NULL);
268 taskqueue_drain_timeout(taskqueue_thread, &rtc->stask);
206 free(rtc, M_DEVBUF);
269 free(rtc, M_DEVBUF);
207 }
208}
209
210void
211clock_schedule(device_t clockdev, u_int offsetns)
212{
213 struct rtc_instance *rtc;
214
215 sx_xlock(&rtc_list_lock);
216 LIST_FOREACH(rtc, &rtc_list, rtc_entries) {
217 if (rtc->clockdev == clockdev) {
218 rtc->schedns = offsetns;
219 break;
220 }
221 }
222 sx_xunlock(&rtc_list_lock);
223}
224
270 }
271}
272
273void
274clock_schedule(device_t clockdev, u_int offsetns)
275{
276 struct rtc_instance *rtc;
277
278 sx_xlock(&rtc_list_lock);
279 LIST_FOREACH(rtc, &rtc_list, rtc_entries) {
280 if (rtc->clockdev == clockdev) {
281 rtc->schedns = offsetns;
282 break;
283 }
284 }
285 sx_xunlock(&rtc_list_lock);
286}
287
288static int
289read_clocks(struct timespec *ts, bool debug_read)
290{
291 struct rtc_instance *rtc;
292 int error;
293
294 error = ENXIO;
295 sx_xlock(&rtc_list_lock);
296 LIST_FOREACH(rtc, &rtc_list, rtc_entries) {
297 if ((error = CLOCK_GETTIME(rtc->clockdev, ts)) != 0)
298 continue;
299 if (ts->tv_sec < 0 || ts->tv_nsec < 0) {
300 error = EINVAL;
301 continue;
302 }
303 if (!(rtc->flags & CLOCKF_GETTIME_NO_ADJ)) {
304 timespecadd(ts, &rtc->resadj);
305 ts->tv_sec += utc_offset();
306 }
307 if (!debug_read) {
308 if (bootverbose)
309 device_printf(rtc->clockdev,
310 "providing initial system time\n");
311 break;
312 }
313 }
314 sx_xunlock(&rtc_list_lock);
315 return (error);
316}
317
225/*
226 * Initialize the system time. Must be called from a context which does not
227 * restrict any locking or sleeping that clock drivers may need to do.
228 *
229 * First attempt to get the time from a registered realtime clock. The clocks
230 * are queried in order of resolution until one provides the time. If no clock
231 * can provide the current time, use the 'base' time provided by the caller, if
232 * non-zero. The 'base' time is potentially highly inaccurate, such as the last
233 * known good value of the system clock, or even a filesystem last-updated
234 * timestamp. It is used to prevent system time from appearing to move
235 * backwards in logs.
236 */
237void
238inittodr(time_t base)
239{
240 struct timespec ts;
318/*
319 * Initialize the system time. Must be called from a context which does not
320 * restrict any locking or sleeping that clock drivers may need to do.
321 *
322 * First attempt to get the time from a registered realtime clock. The clocks
323 * are queried in order of resolution until one provides the time. If no clock
324 * can provide the current time, use the 'base' time provided by the caller, if
325 * non-zero. The 'base' time is potentially highly inaccurate, such as the last
326 * known good value of the system clock, or even a filesystem last-updated
327 * timestamp. It is used to prevent system time from appearing to move
328 * backwards in logs.
329 */
330void
331inittodr(time_t base)
332{
333 struct timespec ts;
241 struct rtc_instance *rtc;
242 int error;
243
334 int error;
335
244 error = ENXIO;
245 sx_xlock(&rtc_list_lock);
246 LIST_FOREACH(rtc, &rtc_list, rtc_entries) {
247 if ((error = CLOCK_GETTIME(rtc->clockdev, &ts)) != 0)
248 continue;
249 if (ts.tv_sec < 0 || ts.tv_nsec < 0) {
250 error = EINVAL;
251 continue;
252 }
253 if (!(rtc->flags & CLOCKF_GETTIME_NO_ADJ)) {
254 timespecadd(&ts, &rtc->resadj);
255 ts.tv_sec += utc_offset();
256 }
257 if (bootverbose)
258 device_printf(rtc->clockdev,
259 "providing initial system time\n");
260 break;
261 }
262 sx_xunlock(&rtc_list_lock);
336 error = read_clocks(&ts, false);
263
264 /*
265 * Do not report errors from each clock; it is expected that some clocks
266 * cannot provide results in some situations. Only report problems when
267 * no clocks could provide the time.
268 */
269 if (error != 0) {
270 switch (error) {

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317 sbt = nstosbt(waitns);
318 } else
319 sbt = 0;
320 taskqueue_enqueue_timeout_sbt(taskqueue_thread,
321 &rtc->stask, -sbt, 0, C_PREL(31));
322 }
323 sx_xunlock(&rtc_list_lock);
324}
337
338 /*
339 * Do not report errors from each clock; it is expected that some clocks
340 * cannot provide results in some situations. Only report problems when
341 * no clocks could provide the time.
342 */
343 if (error != 0) {
344 switch (error) {

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391 sbt = nstosbt(waitns);
392 } else
393 sbt = 0;
394 taskqueue_enqueue_timeout_sbt(taskqueue_thread,
395 &rtc->stask, -sbt, 0, C_PREL(31));
396 }
397 sx_xunlock(&rtc_list_lock);
398}
399
400static int
401sysctl_clock_do_io(SYSCTL_HANDLER_ARGS)
402{
403 struct timespec ts_discard;
404 int error, value;
405
406 value = 0;
407 error = sysctl_handle_int(oidp, &value, 0, req);
408 if (error != 0 || req->newptr == NULL)
409 return (error);
410
411 switch (value) {
412 case CLOCK_DBG_READ:
413 if (read_clocks(&ts_discard, true) == ENXIO)
414 printf("No registered RTC clocks\n");
415 break;
416 case CLOCK_DBG_WRITE:
417 resettodr();
418 break;
419 default:
420 return (EINVAL);
421 }
422
423 return (0);
424}