~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/cris/arch-v10/kernel/fasttimer.c

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * linux/arch/cris/kernel/fasttimer.c
  3  *
  4  * Fast timers for ETRAX100/ETRAX100LX
  5  *
  6  * Copyright (C) 2000-2007 Axis Communications AB, Lund, Sweden
  7  */
  8 
  9 #include <linux/errno.h>
 10 #include <linux/sched.h>
 11 #include <linux/kernel.h>
 12 #include <linux/param.h>
 13 #include <linux/string.h>
 14 #include <linux/mm.h>
 15 #include <linux/vmalloc.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/time.h>
 18 #include <linux/delay.h>
 19 
 20 #include <asm/segment.h>
 21 #include <asm/io.h>
 22 #include <asm/irq.h>
 23 #include <asm/delay.h>
 24 
 25 #include <arch/svinto.h>
 26 #include <asm/fasttimer.h>
 27 #include <linux/proc_fs.h>
 28 #include <linux/seq_file.h>
 29 
 30 
 31 #define DEBUG_LOG_INCLUDED
 32 #define FAST_TIMER_LOG
 33 /* #define FAST_TIMER_TEST */
 34 
 35 #define FAST_TIMER_SANITY_CHECKS
 36 
 37 #ifdef FAST_TIMER_SANITY_CHECKS
 38 static int sanity_failed;
 39 #endif
 40 
 41 #define D1(x)
 42 #define D2(x)
 43 #define DP(x)
 44 
 45 static unsigned int fast_timer_running;
 46 static unsigned int fast_timers_added;
 47 static unsigned int fast_timers_started;
 48 static unsigned int fast_timers_expired;
 49 static unsigned int fast_timers_deleted;
 50 static unsigned int fast_timer_is_init;
 51 static unsigned int fast_timer_ints;
 52 
 53 struct fast_timer *fast_timer_list = NULL;
 54 
 55 #ifdef DEBUG_LOG_INCLUDED
 56 #define DEBUG_LOG_MAX 128
 57 static const char * debug_log_string[DEBUG_LOG_MAX];
 58 static unsigned long debug_log_value[DEBUG_LOG_MAX];
 59 static unsigned int debug_log_cnt;
 60 static unsigned int debug_log_cnt_wrapped;
 61 
 62 #define DEBUG_LOG(string, value) \
 63 { \
 64   unsigned long log_flags; \
 65   local_irq_save(log_flags); \
 66   debug_log_string[debug_log_cnt] = (string); \
 67   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
 68   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
 69   { \
 70     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
 71     debug_log_cnt_wrapped = 1; \
 72   } \
 73   local_irq_restore(log_flags); \
 74 }
 75 #else
 76 #define DEBUG_LOG(string, value)
 77 #endif
 78 
 79 
 80 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
 81 #define NUM_TIMER_FREQ 15
 82 #define MAX_USABLE_TIMER_FREQ 7
 83 #define MAX_DELAY_US  853333L
 84 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
 85 {
 86   3,   /* 0 3333 - 853333 us */
 87   6,   /* 1 1666 - 426666 us */
 88   12,  /* 2  833 - 213333 us */
 89   24,  /* 3  416 - 106666 us */
 90   48,  /* 4  208 -  53333 us */
 91   96,  /* 5  104 -  26666 us */
 92   192, /* 6   52 -  13333 us */
 93   384, /* 7   26 -   6666 us */
 94   576,
 95   1152,
 96   2304,
 97   4608,
 98   9216,
 99   18432,
100   62500,
101   /* 15 = cascade */
102 };
103 #define NUM_TIMER_STATS 16
104 #ifdef FAST_TIMER_LOG
105 struct fast_timer timer_added_log[NUM_TIMER_STATS];
106 struct fast_timer timer_started_log[NUM_TIMER_STATS];
107 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
108 #endif
109 
110 int timer_div_settings[NUM_TIMER_STATS];
111 int timer_freq_settings[NUM_TIMER_STATS];
112 int timer_delay_settings[NUM_TIMER_STATS];
113 
114 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
115 inline void do_gettimeofday_fast(struct fasttime_t *tv)
116 {
117         tv->tv_jiff = jiffies;
118         tv->tv_usec = GET_JIFFIES_USEC();
119 }
120 
121 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
122 {
123         /* Compare jiffies. Takes care of wrapping */
124         if (time_before(t0->tv_jiff, t1->tv_jiff))
125                 return -1;
126         else if (time_after(t0->tv_jiff, t1->tv_jiff))
127                 return 1;
128 
129         /* Compare us */
130         if (t0->tv_usec < t1->tv_usec)
131                 return -1;
132         else if (t0->tv_usec > t1->tv_usec)
133                 return 1;
134         return 0;
135 }
136 
137 inline void start_timer1(unsigned long delay_us)
138 {
139   int freq_index = 0; /* This is the lowest resolution */
140   unsigned long upper_limit = MAX_DELAY_US;
141 
142   unsigned long div;
143   /* Start/Restart the timer to the new shorter value */
144   /* t = 1/freq = 1/19200 = 53us
145    * T=div*t,  div = T/t = delay_us*freq/1000000
146    */
147 #if 1 /* Adaptive timer settings */
148   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
149   {
150     freq_index++;
151     upper_limit >>= 1; /* Divide by 2 using shift */
152   }
153   if (freq_index > 0)
154   {
155     freq_index--;
156   }
157 #else
158   freq_index = 6;
159 #endif
160   div = delay_us * timer_freq_100[freq_index]/10000;
161   if (div < 2)
162   {
163     /* Maybe increase timer freq? */
164     div = 2;
165   }
166   if (div > 255)
167   {
168     div = 0; /* This means 256, the max the timer takes */
169     /* If a longer timeout than the timer can handle is used,
170      * then we must restart it when it goes off.
171      */
172   }
173 
174   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
175   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
176   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
177 
178         D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
179             delay_us, freq_index, div));
180   /* Clear timer1 irq */
181   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
182 
183   /* Set timer values */
184   *R_TIMER_CTRL = r_timer_ctrl_shadow =
185     (r_timer_ctrl_shadow &
186      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
187      ~IO_MASK(R_TIMER_CTRL, tm1) &
188      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
189     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
190     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
191     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
192 
193   /* Ack interrupt */
194   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
195     IO_STATE(R_TIMER_CTRL, i1, clr);
196 
197   /* Start timer */
198   *R_TIMER_CTRL = r_timer_ctrl_shadow =
199     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
200     IO_STATE(R_TIMER_CTRL, tm1, run);
201 
202   /* Enable timer1 irq */
203   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
204   fast_timers_started++;
205   fast_timer_running = 1;
206 }
207 
208 /* In version 1.4 this function takes 27 - 50 us */
209 void start_one_shot_timer(struct fast_timer *t,
210                           fast_timer_function_type *function,
211                           unsigned long data,
212                           unsigned long delay_us,
213                           const char *name)
214 {
215   unsigned long flags;
216   struct fast_timer *tmp;
217 
218   D1(printk("sft %s %d us\n", name, delay_us));
219 
220   local_irq_save(flags);
221 
222   do_gettimeofday_fast(&t->tv_set);
223   tmp = fast_timer_list;
224 
225 #ifdef FAST_TIMER_SANITY_CHECKS
226         /* Check so this is not in the list already... */
227         while (tmp != NULL) {
228                 if (tmp == t) {
229                         printk(KERN_WARNING "timer name: %s data: "
230                                 "0x%08lX already in list!\n", name, data);
231                         sanity_failed++;
232                         goto done;
233                 } else
234                         tmp = tmp->next;
235         }
236         tmp = fast_timer_list;
237 #endif
238 
239   t->delay_us = delay_us;
240   t->function = function;
241   t->data = data;
242   t->name = name;
243 
244   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
245         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
246   if (t->tv_expires.tv_usec > 1000000)
247   {
248     t->tv_expires.tv_usec -= 1000000;
249                 t->tv_expires.tv_jiff += HZ;
250   }
251 #ifdef FAST_TIMER_LOG
252   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
253 #endif
254   fast_timers_added++;
255 
256   /* Check if this should timeout before anything else */
257         if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
258   {
259     /* Put first in list and modify the timer value */
260     t->prev = NULL;
261     t->next = fast_timer_list;
262     if (fast_timer_list)
263     {
264       fast_timer_list->prev = t;
265     }
266     fast_timer_list = t;
267 #ifdef FAST_TIMER_LOG
268     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
269 #endif
270     start_timer1(delay_us);
271   } else {
272     /* Put in correct place in list */
273                 while (tmp->next && fasttime_cmp(&t->tv_expires,
274                                 &tmp->next->tv_expires) > 0)
275     {
276       tmp = tmp->next;
277     }
278     /* Insert t after tmp */
279     t->prev = tmp;
280     t->next = tmp->next;
281     if (tmp->next)
282     {
283       tmp->next->prev = t;
284     }
285     tmp->next = t;
286   }
287 
288   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
289 
290 done:
291   local_irq_restore(flags);
292 } /* start_one_shot_timer */
293 
294 static inline int fast_timer_pending (const struct fast_timer * t)
295 {
296   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
297 }
298 
299 static inline int detach_fast_timer (struct fast_timer *t)
300 {
301   struct fast_timer *next, *prev;
302   if (!fast_timer_pending(t))
303     return 0;
304   next = t->next;
305   prev = t->prev;
306   if (next)
307     next->prev = prev;
308   if (prev)
309     prev->next = next;
310   else
311     fast_timer_list = next;
312   fast_timers_deleted++;
313   return 1;
314 }
315 
316 int del_fast_timer(struct fast_timer * t)
317 {
318   unsigned long flags;
319   int ret;
320   
321   local_irq_save(flags);
322   ret = detach_fast_timer(t);
323   t->next = t->prev = NULL;
324   local_irq_restore(flags);
325   return ret;
326 } /* del_fast_timer */
327 
328 
329 /* Interrupt routines or functions called in interrupt context */
330 
331 /* Timer 1 interrupt handler */
332 
333 static irqreturn_t
334 timer1_handler(int irq, void *dev_id)
335 {
336   struct fast_timer *t;
337   unsigned long flags;
338 
339         /* We keep interrupts disabled not only when we modify the
340          * fast timer list, but any time we hold a reference to a
341          * timer in the list, since del_fast_timer may be called
342          * from (another) interrupt context.  Thus, the only time
343          * when interrupts are enabled is when calling the timer
344          * callback function.
345          */
346   local_irq_save(flags);
347 
348   /* Clear timer1 irq */
349   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
350 
351   /* First stop timer, then ack interrupt */
352   /* Stop timer */
353   *R_TIMER_CTRL = r_timer_ctrl_shadow =
354     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
355     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
356 
357   /* Ack interrupt */
358   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
359 
360   fast_timer_running = 0;
361   fast_timer_ints++;
362 
363   t = fast_timer_list;
364   while (t)
365   {
366                 struct fasttime_t tv;
367                 fast_timer_function_type *f;
368                 unsigned long d;
369 
370     /* Has it really expired? */
371     do_gettimeofday_fast(&tv);
372                 D1(printk(KERN_DEBUG "t: %is %06ius\n",
373                         tv.tv_jiff, tv.tv_usec));
374 
375                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
376     {
377       /* Yes it has expired */
378 #ifdef FAST_TIMER_LOG
379       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
380 #endif
381       fast_timers_expired++;
382 
383       /* Remove this timer before call, since it may reuse the timer */
384       if (t->prev)
385       {
386         t->prev->next = t->next;
387       }
388       else
389       {
390         fast_timer_list = t->next;
391       }
392       if (t->next)
393       {
394         t->next->prev = t->prev;
395       }
396       t->prev = NULL;
397       t->next = NULL;
398 
399                         /* Save function callback data before enabling
400                          * interrupts, since the timer may be removed and
401                          * we don't know how it was allocated
402                          * (e.g. ->function and ->data may become overwritten
403                          * after deletion if the timer was stack-allocated).
404                          */
405                         f = t->function;
406                         d = t->data;
407 
408                         if (f != NULL) {
409                                 /* Run callback with interrupts enabled. */
410                                 local_irq_restore(flags);
411                                 f(d);
412                                 local_irq_save(flags);
413                         } else
414         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
415     }
416     else
417     {
418       /* Timer is to early, let's set it again using the normal routines */
419       D1(printk(".\n"));
420     }
421 
422     if ((t = fast_timer_list) != NULL)
423     {
424       /* Start next timer.. */
425                         long us = 0;
426                         struct fasttime_t tv;
427 
428       do_gettimeofday_fast(&tv);
429 
430                         /* time_after_eq takes care of wrapping */
431                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
432                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
433                                         1000000 / HZ + t->tv_expires.tv_usec -
434                                         tv.tv_usec);
435 
436       if (us > 0)
437       {
438         if (!fast_timer_running)
439         {
440 #ifdef FAST_TIMER_LOG
441           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
442 #endif
443           start_timer1(us);
444         }
445         break;
446       }
447       else
448       {
449         /* Timer already expired, let's handle it better late than never.
450          * The normal loop handles it
451          */
452         D1(printk("e! %d\n", us));
453       }
454     }
455   }
456 
457         local_irq_restore(flags);
458 
459   if (!t)
460   {
461     D1(printk("t1 stop!\n"));
462   }
463 
464   return IRQ_HANDLED;
465 }
466 
467 static void wake_up_func(unsigned long data)
468 {
469   wait_queue_head_t *sleep_wait_p = (wait_queue_head_t *)data;
470   wake_up(sleep_wait_p);
471 }
472 
473 
474 /* Useful API */
475 
476 void schedule_usleep(unsigned long us)
477 {
478   struct fast_timer t;
479   wait_queue_head_t sleep_wait;
480   init_waitqueue_head(&sleep_wait);
481 
482   D1(printk("schedule_usleep(%d)\n", us));
483   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
484                        "usleep");
485         /* Uninterruptible sleep on the fast timer. (The condition is somewhat
486          * redundant since the timer is what wakes us up.) */
487         wait_event(sleep_wait, !fast_timer_pending(&t));
488 
489   D1(printk("done schedule_usleep(%d)\n", us));
490 }
491 
492 #ifdef CONFIG_PROC_FS
493 /* This value is very much based on testing */
494 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
495 
496 static int proc_fasttimer_show(struct seq_file *m, void *v)
497 {
498         unsigned long flags;
499         int i = 0;
500         int num_to_show;
501         struct fasttime_t tv;
502         struct fast_timer *t, *nextt;
503 
504         do_gettimeofday_fast(&tv);
505 
506         seq_printf(m, "Fast timers added:     %i\n", fast_timers_added);
507         seq_printf(m, "Fast timers started:   %i\n", fast_timers_started);
508         seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
509         seq_printf(m, "Fast timers expired:   %i\n", fast_timers_expired);
510         seq_printf(m, "Fast timers deleted:   %i\n", fast_timers_deleted);
511         seq_printf(m, "Fast timer running:    %s\n",
512                    fast_timer_running ? "yes" : "no");
513         seq_printf(m, "Current time:          %lu.%06lu\n",
514                    (unsigned long)tv.tv_jiff,
515                    (unsigned long)tv.tv_usec);
516 #ifdef FAST_TIMER_SANITY_CHECKS
517         seq_printf(m, "Sanity failed:         %i\n", sanity_failed);
518 #endif
519         seq_putc(m, '\n');
520 
521 #ifdef DEBUG_LOG_INCLUDED
522         {
523                 int end_i = debug_log_cnt;
524                 i = 0;
525 
526                 if (debug_log_cnt_wrapped)
527                         i = debug_log_cnt;
528 
529                 while (i != end_i || debug_log_cnt_wrapped) {
530                         seq_printf(m, debug_log_string[i], debug_log_value[i]);
531                         if (seq_has_overflowed(m))
532                                 return 0;
533                         i = (i+1) % DEBUG_LOG_MAX;
534                 }
535         }
536         seq_putc(m, '\n');
537 #endif
538 
539         num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
540                        NUM_TIMER_STATS);
541         seq_printf(m, "Timers started: %i\n", fast_timers_started);
542         for (i = 0; i < num_to_show; i++) {
543                 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
544 
545 #if 1 //ndef FAST_TIMER_LOG
546                 seq_printf(m, "div: %i freq: %i delay: %i\n",
547                            timer_div_settings[cur],
548                            timer_freq_settings[cur],
549                            timer_delay_settings[cur]);
550 #endif
551 #ifdef FAST_TIMER_LOG
552                 t = &timer_started_log[cur];
553                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
554                            t->name,
555                            (unsigned long)t->tv_set.tv_jiff,
556                            (unsigned long)t->tv_set.tv_usec,
557                            (unsigned long)t->tv_expires.tv_jiff,
558                            (unsigned long)t->tv_expires.tv_usec,
559                            t->delay_us,
560                            t->data);
561                 if (seq_has_overflowed(m))
562                         return 0;
563 #endif
564         }
565         seq_putc(m, '\n');
566 
567 #ifdef FAST_TIMER_LOG
568         num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
569                        NUM_TIMER_STATS);
570         seq_printf(m, "Timers added: %i\n", fast_timers_added);
571         for (i = 0; i < num_to_show; i++) {
572                 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
573                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
574                            t->name,
575                            (unsigned long)t->tv_set.tv_jiff,
576                            (unsigned long)t->tv_set.tv_usec,
577                            (unsigned long)t->tv_expires.tv_jiff,
578                            (unsigned long)t->tv_expires.tv_usec,
579                            t->delay_us,
580                            t->data);
581                 if (seq_has_overflowed(m))
582                         return 0;
583         }
584         seq_putc(m, '\n');
585 
586         num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
587                        NUM_TIMER_STATS);
588         seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
589         for (i = 0; i < num_to_show; i++) {
590                 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
591                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
592                            t->name,
593                            (unsigned long)t->tv_set.tv_jiff,
594                            (unsigned long)t->tv_set.tv_usec,
595                            (unsigned long)t->tv_expires.tv_jiff,
596                            (unsigned long)t->tv_expires.tv_usec,
597                            t->delay_us,
598                            t->data);
599                 if (seq_has_overflowed(m))
600                         return 0;
601         }
602         seq_putc(m, '\n');
603 #endif
604 
605         seq_puts(m, "Active timers:\n");
606         local_irq_save(flags);
607         t = fast_timer_list;
608         while (t) {
609                 nextt = t->next;
610                 local_irq_restore(flags);
611                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
612                            t->name,
613                            (unsigned long)t->tv_set.tv_jiff,
614                            (unsigned long)t->tv_set.tv_usec,
615                            (unsigned long)t->tv_expires.tv_jiff,
616                            (unsigned long)t->tv_expires.tv_usec,
617                            t->delay_us,
618                            t->data);
619                 if (seq_has_overflowed(m))
620                         return 0;
621                 local_irq_save(flags);
622                 if (t->next != nextt)
623                         printk(KERN_WARNING "timer removed!\n");
624                 t = nextt;
625         }
626         local_irq_restore(flags);
627 
628         return 0;
629 }
630 
631 static int proc_fasttimer_open(struct inode *inode, struct file *file)
632 {
633         return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
634 }
635 
636 static const struct file_operations proc_fasttimer_fops = {
637         .open           = proc_fasttimer_open,
638         .read           = seq_read,
639         .llseek         = seq_lseek,
640         .release        = single_release,
641 };
642 #endif /* PROC_FS */
643 
644 #ifdef FAST_TIMER_TEST
645 static volatile unsigned long i = 0;
646 static volatile int num_test_timeout = 0;
647 static struct fast_timer tr[10];
648 static int exp_num[10];
649 
650 static struct fasttime_t tv_exp[100];
651 
652 static void test_timeout(unsigned long data)
653 {
654   do_gettimeofday_fast(&tv_exp[data]);
655   exp_num[data] = num_test_timeout;
656 
657   num_test_timeout++;
658 }
659 
660 static void test_timeout1(unsigned long data)
661 {
662   do_gettimeofday_fast(&tv_exp[data]);
663   exp_num[data] = num_test_timeout;
664   if (data < 7)
665   {
666     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
667     i++;
668   }
669   num_test_timeout++;
670 }
671 
672 DP(
673 static char buf0[2000];
674 static char buf1[2000];
675 static char buf2[2000];
676 static char buf3[2000];
677 static char buf4[2000];
678 );
679 
680 static char buf5[6000];
681 static int j_u[1000];
682 
683 static void fast_timer_test(void)
684 {
685   int prev_num;
686   int j;
687 
688         struct fasttime_t tv, tv0, tv1, tv2;
689 
690   printk("fast_timer_test() start\n");
691   do_gettimeofday_fast(&tv);
692 
693   for (j = 0; j < 1000; j++)
694   {
695     j_u[j] = GET_JIFFIES_USEC();
696   }
697   for (j = 0; j < 100; j++)
698   {
699     do_gettimeofday_fast(&tv_exp[j]);
700   }
701         printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
702                 tv.tv_jiff, tv.tv_usec);
703 
704   for (j = 0; j < 1000; j++)
705   {
706     printk("%i %i %i %i %i\n",j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
707     j += 4;
708   }
709   for (j = 0; j < 100; j++)
710   {
711                 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
712                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
713                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
714                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
715                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
716                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
717     j += 4;
718   }
719   do_gettimeofday_fast(&tv0);
720   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
721   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
722   i++;
723   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
724   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
725   i++;
726   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
727   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
728   i++;
729   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
730   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
731   i++;
732   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
733   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
734   i++;
735   do_gettimeofday_fast(&tv1);
736 
737   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
738 
739   prev_num = num_test_timeout;
740   while (num_test_timeout < i)
741   {
742     if (num_test_timeout != prev_num)
743     {
744       prev_num = num_test_timeout;
745     }
746   }
747   do_gettimeofday_fast(&tv2);
748         printk(KERN_DEBUG "Timers started    %is %06i\n",
749                 tv0.tv_jiff, tv0.tv_usec);
750         printk(KERN_DEBUG "Timers started at %is %06i\n",
751                 tv1.tv_jiff, tv1.tv_usec);
752         printk(KERN_DEBUG "Timers done       %is %06i\n",
753                 tv2.tv_jiff, tv2.tv_usec);
754   DP(printk("buf0:\n");
755      printk(buf0);
756      printk("buf1:\n");
757      printk(buf1);
758      printk("buf2:\n");
759      printk(buf2);
760      printk("buf3:\n");
761      printk(buf3);
762      printk("buf4:\n");
763      printk(buf4);
764   );
765   printk("buf5:\n");
766   printk(buf5);
767 
768   printk("timers set:\n");
769   for(j = 0; j<i; j++)
770   {
771     struct fast_timer *t = &tr[j];
772     printk("%-10s set: %6is %06ius exp: %6is %06ius "
773            "data: 0x%08X func: 0x%08X\n",
774            t->name,
775                         t->tv_set.tv_jiff,
776            t->tv_set.tv_usec,
777                         t->tv_expires.tv_jiff,
778            t->tv_expires.tv_usec,
779            t->data,
780            t->function
781            );
782 
783     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
784            t->delay_us,
785                         tv_exp[j].tv_jiff,
786            tv_exp[j].tv_usec,
787            exp_num[j],
788                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
789                                 1000000 + tv_exp[j].tv_usec -
790                                 t->tv_expires.tv_usec);
791   }
792   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
793   printk("buf5 after all done:\n");
794   printk(buf5);
795   printk("fast_timer_test() done\n");
796 }
797 #endif
798 
799 
800 int fast_timer_init(void)
801 {
802   /* For some reason, request_irq() hangs when called froom time_init() */
803   if (!fast_timer_is_init)
804   {
805 #if 0 && defined(FAST_TIMER_TEST)
806     int i;
807 #endif
808 
809     printk(KERN_INFO "fast_timer_init()\n");
810 
811 #if 0 && defined(FAST_TIMER_TEST)
812     for (i = 0; i <= TIMER0_DIV; i++)
813     {
814       /* We must be careful not to get overflow... */
815       printk("%3i %6u\n", i, timer0_value_us[i]);
816     }
817 #endif
818 #ifdef CONFIG_PROC_FS
819    proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
820 #endif /* PROC_FS */
821     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
822                    "fast timer int", NULL))
823     {
824       printk("err: timer1 irq\n");
825     }
826     fast_timer_is_init = 1;
827 #ifdef FAST_TIMER_TEST
828     printk("do test\n");
829     fast_timer_test();
830 #endif
831   }
832         return 0;
833 }
834 __initcall(fast_timer_init);
835 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp