aboutsummaryrefslogtreecommitdiff
path: root/libgomp/oacc-async.c
blob: 026df3c941795d2d4bfd6213be50d52616cf3ef1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
/* OpenACC Runtime Library Definitions.

   Copyright (C) 2013-2022 Free Software Foundation, Inc.

   Contributed by Mentor Embedded.

   This file is part of the GNU Offloading and Multi Processing Library
   (libgomp).

   Libgomp is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

#include <assert.h>
#include <string.h>
#include "openacc.h"
#include "libgomp.h"
#include "oacc-int.h"

static struct goacc_thread *
get_goacc_thread (void)
{
  struct goacc_thread *thr = goacc_thread ();

  if (!thr || !thr->dev)
    gomp_fatal ("no device active");

  return thr;
}

static int
validate_async_val (int async)
{
  if (!async_valid_p (async))
    gomp_fatal ("invalid async-argument: %d", async);

  if (async == acc_async_sync)
    return -1;

  if (async == acc_async_noval)
    return 0;

  if (async >= 0)
    /* TODO: we reserve 0 for acc_async_noval before we can clarify the
       semantics of "default_async".  */
    return 1 + async;
  else
    __builtin_unreachable ();
}

/* Return the asyncqueue to be used for OpenACC async-argument ASYNC.  This
   might return NULL if no asyncqueue is to be used.  Otherwise, if CREATE,
   create the asyncqueue if it doesn't exist yet.

   Unless CREATE, this will not generate any OpenACC Profiling Interface
   events.  */

attribute_hidden struct goacc_asyncqueue *
lookup_goacc_asyncqueue (struct goacc_thread *thr, bool create, int async)
{
  async = validate_async_val (async);
  if (async < 0)
    return NULL;

  struct goacc_asyncqueue *ret_aq = NULL;
  struct gomp_device_descr *dev = thr->dev;

  gomp_mutex_lock (&dev->openacc.async.lock);

  if (!create
      && (async >= dev->openacc.async.nasyncqueue
	  || !dev->openacc.async.asyncqueue[async]))
    goto end;

  if (async >= dev->openacc.async.nasyncqueue)
    {
      int diff = async + 1 - dev->openacc.async.nasyncqueue;
      dev->openacc.async.asyncqueue
	= gomp_realloc (dev->openacc.async.asyncqueue,
			sizeof (goacc_aq) * (async + 1));
      memset (dev->openacc.async.asyncqueue + dev->openacc.async.nasyncqueue,
	      0, sizeof (goacc_aq) * diff);
      dev->openacc.async.nasyncqueue = async + 1;
    }

  if (!dev->openacc.async.asyncqueue[async])
    {
      dev->openacc.async.asyncqueue[async]
	= dev->openacc.async.construct_func (dev->target_id);

      if (!dev->openacc.async.asyncqueue[async])
	{
	  gomp_mutex_unlock (&dev->openacc.async.lock);
	  gomp_fatal ("async %d creation failed", async);
	}
      
      /* Link new async queue into active list.  */
      goacc_aq_list n = gomp_malloc (sizeof (struct goacc_asyncqueue_list));
      n->aq = dev->openacc.async.asyncqueue[async];
      n->next = dev->openacc.async.active;
      dev->openacc.async.active = n;
    }

  ret_aq = dev->openacc.async.asyncqueue[async];

 end:
  gomp_mutex_unlock (&dev->openacc.async.lock);
  return ret_aq;
}

/* Return the asyncqueue to be used for OpenACC async-argument ASYNC.  This
   might return NULL if no asyncqueue is to be used.  Otherwise, create the
   asyncqueue if it doesn't exist yet.  */

attribute_hidden struct goacc_asyncqueue *
get_goacc_asyncqueue (int async)
{
  struct goacc_thread *thr = get_goacc_thread ();
  return lookup_goacc_asyncqueue (thr, true, async);
}

int
acc_async_test (int async)
{
  struct goacc_thread *thr = goacc_thread ();

  if (!thr || !thr->dev)
    gomp_fatal ("no device active");

  goacc_aq aq = lookup_goacc_asyncqueue (thr, false, async);
  if (!aq)
    return 1;

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
  if (profiling_p)
    {
      prof_info.async = async;
      prof_info.async_queue = prof_info.async;
    }

  int res = thr->dev->openacc.async.test_func (aq);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }

  return res;
}

int
acc_async_test_all (void)
{
  struct goacc_thread *thr = get_goacc_thread ();

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);

  int ret = 1;
  gomp_mutex_lock (&thr->dev->openacc.async.lock);
  for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
    if (!thr->dev->openacc.async.test_func (l->aq))
      {
	ret = 0;
	break;
      }
  gomp_mutex_unlock (&thr->dev->openacc.async.lock);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }

  return ret;
}

void
acc_wait (int async)
{
  struct goacc_thread *thr = get_goacc_thread ();

  goacc_aq aq = lookup_goacc_asyncqueue (thr, false, async);
  if (!aq)
    return;

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
  if (profiling_p)
    {
      prof_info.async = async;
      prof_info.async_queue = prof_info.async;
    }

  if (!thr->dev->openacc.async.synchronize_func (aq))
    gomp_fatal ("wait on %d failed", async);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }
}

/* acc_async_wait is an OpenACC 1.0 compatibility name for acc_wait.  */
#ifdef HAVE_ATTRIBUTE_ALIAS
strong_alias (acc_wait, acc_async_wait)
#else
void
acc_async_wait (int async)
{
  acc_wait (async);
}
#endif

void
acc_wait_async (int async1, int async2)
{
  struct goacc_thread *thr = get_goacc_thread ();

  goacc_aq aq1 = lookup_goacc_asyncqueue (thr, false, async1);
  /* TODO: Is this also correct for acc_async_sync, assuming that in this case,
     we'll always be synchronous anyways?  */
  if (!aq1)
    return;

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
  if (profiling_p)
    {
      prof_info.async = async2;
      prof_info.async_queue = prof_info.async;
    }

  goacc_aq aq2 = lookup_goacc_asyncqueue (thr, true, async2);
  /* An async queue is always synchronized with itself.  */
  if (aq1 == aq2)
    goto out_prof;

  if (aq2)
    {
      if (!thr->dev->openacc.async.serialize_func (aq1, aq2))
	gomp_fatal ("ordering of async ids %d and %d failed", async1, async2);
    }
  else
    {
      /* TODO: Local thread synchronization.
	 Necessary for the "async2 == acc_async_sync" case, or can just skip?  */
      if (!thr->dev->openacc.async.synchronize_func (aq1))
	gomp_fatal ("wait on %d failed", async1);
    }

 out_prof:
  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }
}

void
acc_wait_all (void)
{
  struct goacc_thread *thr = goacc_thread ();

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);

  bool ret = true;
  gomp_mutex_lock (&thr->dev->openacc.async.lock);
  for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
    ret &= thr->dev->openacc.async.synchronize_func (l->aq);
  gomp_mutex_unlock (&thr->dev->openacc.async.lock);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }

  if (!ret)
    gomp_fatal ("wait all failed");
}

/* acc_async_wait_all is an OpenACC 1.0 compatibility name for acc_wait_all.  */
#ifdef HAVE_ATTRIBUTE_ALIAS
strong_alias (acc_wait_all, acc_async_wait_all)
#else
void
acc_async_wait_all (void)
{
  acc_wait_all ();
}
#endif

void
acc_wait_all_async (int async)
{
  struct goacc_thread *thr = get_goacc_thread ();

  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
  if (profiling_p)
    {
      prof_info.async = async;
      prof_info.async_queue = prof_info.async;
    }

  goacc_aq waiting_queue = lookup_goacc_asyncqueue (thr, true, async);

  bool ret = true;
  gomp_mutex_lock (&thr->dev->openacc.async.lock);
  for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
    {
      if (waiting_queue)
	ret &= thr->dev->openacc.async.serialize_func (l->aq, waiting_queue);
      else
	/* TODO: Local thread synchronization.
	   Necessary for the "async2 == acc_async_sync" case, or can just skip?  */
	ret &= thr->dev->openacc.async.synchronize_func (l->aq);
    }
  gomp_mutex_unlock (&thr->dev->openacc.async.lock);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }

  if (!ret)
    gomp_fatal ("wait all async(%d) failed", async);
}

void
GOACC_wait (int async, int num_waits, ...)
{
  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();

  /* No nesting.  */
  assert (thr->prof_info == NULL);
  assert (thr->api_info == NULL);
  acc_prof_info prof_info;
  acc_api_info api_info;
  bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
  if (profiling_p)
    {
      prof_info.async = async;
      prof_info.async_queue = prof_info.async;
    }

  if (num_waits)
    {
      va_list ap;

      va_start (ap, num_waits);
      goacc_wait (async, num_waits, &ap);
      va_end (ap);
    }
  else if (async == acc_async_sync)
    acc_wait_all ();
  else
    acc_wait_all_async (async);

  if (profiling_p)
    {
      thr->prof_info = NULL;
      thr->api_info = NULL;
    }
}

attribute_hidden void
goacc_wait (int async, int num_waits, va_list *ap)
{
  while (num_waits--)
    {
      int qid = va_arg (*ap, int);

      /* Waiting on ACC_ASYNC_NOVAL maps to 'wait all'.  */
      if (qid == acc_async_noval)
	{
	  if (async == acc_async_sync)
	    acc_wait_all ();
	  else
	    acc_wait_all_async (async);
	  break;
	}

      if (acc_async_test (qid))
	continue;

      if (async == acc_async_sync)
	acc_wait (qid);
      else if (qid == async)
	/* If we're waiting on the same asynchronous queue as we're
	   launching on, the queue itself will order work as
	   required, so there's no need to wait explicitly.  */
	;
      else
	acc_wait_async (qid, async);
    }
}

attribute_hidden void
goacc_async_free (struct gomp_device_descr *devicep,
		  struct goacc_asyncqueue *aq, void *ptr)
{
  if (!aq)
    free (ptr);
  else
    devicep->openacc.async.queue_callback_func (aq, free, ptr);
}

/* This function initializes the asyncqueues for the device specified by
   DEVICEP.  TODO DEVICEP must be locked on entry, and remains locked on
   return.  */

attribute_hidden void
goacc_init_asyncqueues (struct gomp_device_descr *devicep)
{
  devicep->openacc.async.nasyncqueue = 0;
  devicep->openacc.async.asyncqueue = NULL;
  devicep->openacc.async.active = NULL;
  gomp_mutex_init (&devicep->openacc.async.lock);
}

/* This function finalizes the asyncqueues for the device specified by DEVICEP.
   TODO DEVICEP must be locked on entry, and remains locked on return.  */

attribute_hidden bool
goacc_fini_asyncqueues (struct gomp_device_descr *devicep)
{
  bool ret = true;
  gomp_mutex_lock (&devicep->openacc.async.lock);
  if (devicep->openacc.async.nasyncqueue > 0)
    {
      goacc_aq_list next;
      for (goacc_aq_list l = devicep->openacc.async.active; l; l = next)
	{
	  ret &= devicep->openacc.async.destruct_func (l->aq);
	  next = l->next;
	  free (l);
	}
      free (devicep->openacc.async.asyncqueue);
      devicep->openacc.async.nasyncqueue = 0;
      devicep->openacc.async.asyncqueue = NULL;
      devicep->openacc.async.active = NULL;
    }
  gomp_mutex_unlock (&devicep->openacc.async.lock);
  gomp_mutex_destroy (&devicep->openacc.async.lock);
  return ret;
}