aboutsummaryrefslogtreecommitdiff
path: root/libgomp/oacc-mem.c
blob: 247ca1358043640d5e7e4303a76e2004bd1ff429 (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
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
/* OpenACC Runtime initialization routines

   Copyright (C) 2013-2020 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 "openacc.h"
#include "libgomp.h"
#include "gomp-constants.h"
#include "oacc-int.h"
#include <string.h>
#include <assert.h>

/* Return block containing [H->S), or NULL if not contained.  The device lock
   for DEV must be locked on entry, and remains locked on exit.  */

static splay_tree_key
lookup_host (struct gomp_device_descr *dev, void *h, size_t s)
{
  struct splay_tree_key_s node;
  splay_tree_key key;

  node.host_start = (uintptr_t) h;
  node.host_end = (uintptr_t) h + s;

  key = splay_tree_lookup (&dev->mem_map, &node);

  return key;
}

/* Helper for lookup_dev.  Iterate over splay tree.  */

static splay_tree_key
lookup_dev_1 (splay_tree_node node, uintptr_t d, size_t s)
{
  splay_tree_key key = &node->key;
  if (d >= key->tgt->tgt_start && d + s <= key->tgt->tgt_end)
    return key;

  key = NULL;
  if (node->left)
    key = lookup_dev_1 (node->left, d, s);
  if (!key && node->right)
    key = lookup_dev_1 (node->right, d, s);

  return key;
}

/* Return block containing [D->S), or NULL if not contained.

   This iterates over the splay tree.  This is not expected to be a common
   operation.

   The device lock associated with MEM_MAP must be locked on entry, and remains
   locked on exit.  */

static splay_tree_key
lookup_dev (splay_tree mem_map, void *d, size_t s)
{
  if (!mem_map || !mem_map->root)
    return NULL;

  return lookup_dev_1 (mem_map->root, (uintptr_t) d, s);
}


/* OpenACC is silent on how memory exhaustion is indicated.  We return
   NULL.  */

void *
acc_malloc (size_t s)
{
  if (!s)
    return NULL;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();

  assert (thr->dev);

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return malloc (s);

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

  void *res = thr->dev->alloc_func (thr->dev->target_id, s);

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

  return res;
}

void
acc_free (void *d)
{
  splay_tree_key k;

  if (!d)
    return;

  struct goacc_thread *thr = goacc_thread ();

  assert (thr && thr->dev);

  struct gomp_device_descr *acc_dev = thr->dev;

  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return free (d);

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

  gomp_mutex_lock (&acc_dev->lock);

  /* We don't have to call lazy open here, as the ptr value must have
     been returned by acc_malloc.  It's not permitted to pass NULL in
     (unless you got that null from acc_malloc).  */
  if ((k = lookup_dev (&acc_dev->mem_map, d, 1)))
    {
      void *offset = d - k->tgt->tgt_start + k->tgt_offset;
      void *h = k->host_start + offset;
      size_t h_size = k->host_end - k->host_start;
      gomp_mutex_unlock (&acc_dev->lock);
      /* PR92503 "[OpenACC] Behavior of 'acc_free' if the memory space is still
	 used in a mapping".  */
      gomp_fatal ("refusing to free device memory space at %p that is still"
		  " mapped at [%p,+%d]",
		  d, h, (int) h_size);
    }
  else
    gomp_mutex_unlock (&acc_dev->lock);

  if (!acc_dev->free_func (acc_dev->target_id, d))
    gomp_fatal ("error in freeing device memory in %s", __FUNCTION__);

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

static void
memcpy_tofrom_device (bool from, void *d, void *h, size_t s, int async,
		      const char *libfnname)
{
  /* No need to call lazy open here, as the device pointer must have
     been obtained from a routine that did that.  */
  struct goacc_thread *thr = goacc_thread ();

  assert (thr && thr->dev);

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    {
      if (from)
	memmove (h, d, s);
      else
	memmove (d, h, s);
      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;
    }

  goacc_aq aq = get_goacc_asyncqueue (async);
  if (from)
    gomp_copy_dev2host (thr->dev, aq, h, d, s);
  else
    gomp_copy_host2dev (thr->dev, aq, d, h, s, /* TODO: cbuf? */ NULL);

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

void
acc_memcpy_to_device (void *d, void *h, size_t s)
{
  memcpy_tofrom_device (false, d, h, s, acc_async_sync, __FUNCTION__);
}

void
acc_memcpy_to_device_async (void *d, void *h, size_t s, int async)
{
  memcpy_tofrom_device (false, d, h, s, async, __FUNCTION__);
}

void
acc_memcpy_from_device (void *h, void *d, size_t s)
{
  memcpy_tofrom_device (true, d, h, s, acc_async_sync, __FUNCTION__);
}

void
acc_memcpy_from_device_async (void *h, void *d, size_t s, int async)
{
  memcpy_tofrom_device (true, d, h, s, async, __FUNCTION__);
}

/* Return the device pointer that corresponds to host data H.  Or NULL
   if no mapping.  */

void *
acc_deviceptr (void *h)
{
  splay_tree_key n;
  void *d;
  void *offset;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *dev = thr->dev;

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return h;

  /* In the following, no OpenACC Profiling Interface events can possibly be
     generated.  */

  gomp_mutex_lock (&dev->lock);

  n = lookup_host (dev, h, 1);

  if (!n)
    {
      gomp_mutex_unlock (&dev->lock);
      return NULL;
    }

  offset = h - n->host_start;

  d = n->tgt->tgt_start + n->tgt_offset + offset;

  gomp_mutex_unlock (&dev->lock);

  return d;
}

/* Return the host pointer that corresponds to device data D.  Or NULL
   if no mapping.  */

void *
acc_hostptr (void *d)
{
  splay_tree_key n;
  void *h;
  void *offset;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return d;

  /* In the following, no OpenACC Profiling Interface events can possibly be
     generated.  */

  gomp_mutex_lock (&acc_dev->lock);

  n = lookup_dev (&acc_dev->mem_map, d, 1);

  if (!n)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      return NULL;
    }

  offset = d - n->tgt->tgt_start + n->tgt_offset;

  h = n->host_start + offset;

  gomp_mutex_unlock (&acc_dev->lock);

  return h;
}

/* Return 1 if host data [H,+S] is present on the device.  */

int
acc_is_present (void *h, size_t s)
{
  splay_tree_key n;

  if (!s || !h)
    return 0;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return h != NULL;

  /* In the following, no OpenACC Profiling Interface events can possibly be
     generated.  */

  gomp_mutex_lock (&acc_dev->lock);

  n = lookup_host (acc_dev, h, s);

  if (n && ((uintptr_t)h < n->host_start
	    || (uintptr_t)h + s > n->host_end
	    || s > n->host_end - n->host_start))
    n = NULL;

  gomp_mutex_unlock (&acc_dev->lock);

  return n != NULL;
}

/* Create a mapping for host [H,+S] -> device [D,+S] */

void
acc_map_data (void *h, void *d, size_t s)
{
  size_t mapnum = 1;
  void *hostaddrs = h;
  void *devaddrs = d;
  size_t sizes = s;
  unsigned short kinds = GOMP_MAP_ALLOC;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    {
      if (d != h)
        gomp_fatal ("cannot map data on shared-memory system");
    }
  else
    {
      struct goacc_thread *thr = goacc_thread ();

      if (!d || !h || !s)
	gomp_fatal ("[%p,+%d]->[%p,+%d] is a bad map",
                    (void *)h, (int)s, (void *)d, (int)s);

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

      gomp_mutex_lock (&acc_dev->lock);

      if (lookup_host (acc_dev, h, s))
        {
	  gomp_mutex_unlock (&acc_dev->lock);
	  gomp_fatal ("host address [%p, +%d] is already mapped", (void *)h,
		      (int)s);
	}

      if (lookup_dev (&thr->dev->mem_map, d, s))
        {
	  gomp_mutex_unlock (&acc_dev->lock);
	  gomp_fatal ("device address [%p, +%d] is already mapped", (void *)d,
		      (int)s);
	}

      gomp_mutex_unlock (&acc_dev->lock);

      struct target_mem_desc *tgt
	= gomp_map_vars (acc_dev, mapnum, &hostaddrs, &devaddrs, &sizes,
			 &kinds, true, GOMP_MAP_VARS_ENTER_DATA);
      assert (tgt);
      assert (tgt->list_count == 1);
      splay_tree_key n = tgt->list[0].key;
      assert (n);
      assert (n->refcount == 1);
      assert (n->virtual_refcount == 0);
      /* Special reference counting behavior.  */
      n->refcount = REFCOUNT_INFINITY;

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

void
acc_unmap_data (void *h)
{
  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  /* No need to call lazy open, as the address must have been mapped.  */

  /* This is a no-op on shared-memory targets.  */
  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return;

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

  gomp_mutex_lock (&acc_dev->lock);

  splay_tree_key n = lookup_host (acc_dev, h, 1);

  if (!n)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("%p is not a mapped block", (void *)h);
    }

  size_t host_size = n->host_end - n->host_start;

  if (n->host_start != (uintptr_t) h)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("[%p,%d] surrounds %p",
		  (void *) n->host_start, (int) host_size, (void *) h);
    }
  /* TODO This currently doesn't catch 'REFCOUNT_INFINITY' usage different from
     'acc_map_data'.  Maybe 'virtual_refcount' can be used for disambiguating
     the different 'REFCOUNT_INFINITY' cases, or simply separate
     'REFCOUNT_INFINITY' values per different usage ('REFCOUNT_ACC_MAP_DATA'
     etc.)?  */
  else if (n->refcount != REFCOUNT_INFINITY)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("refusing to unmap block [%p,+%d] that has not been mapped"
		  " by 'acc_map_data'",
		  (void *) h, (int) host_size);
    }

  struct target_mem_desc *tgt = n->tgt;

  if (tgt->refcount == REFCOUNT_INFINITY)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("cannot unmap target block");
    }

  /* Above, we've verified that the mapping must have been set up by
     'acc_map_data'.  */
  assert (tgt->refcount == 1);

  /* Nullifying these fields prevents 'gomp_unmap_tgt' via 'gomp_remove_var'
     from freeing the target memory.  */
  tgt->tgt_end = 0;
  tgt->to_free = NULL;

  bool is_tgt_unmapped = gomp_remove_var (acc_dev, n);
  assert (is_tgt_unmapped);

  gomp_mutex_unlock (&acc_dev->lock);

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


/* Enter dynamic mapping for a single datum.  Return the device pointer.  */

static void *
goacc_enter_datum (void **hostaddrs, size_t *sizes, void *kinds, int async)
{
  void *d;
  splay_tree_key n;

  if (!hostaddrs[0] || !sizes[0])
    gomp_fatal ("[%p,+%d] is a bad range", hostaddrs[0], (int) sizes[0]);

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return hostaddrs[0];

  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;
    }

  gomp_mutex_lock (&acc_dev->lock);

  n = lookup_host (acc_dev, hostaddrs[0], sizes[0]);
  if (n)
    {
      void *h = hostaddrs[0];
      size_t s = sizes[0];

      /* Present. */
      d = (void *) (n->tgt->tgt_start + n->tgt_offset + h - n->host_start);

      if ((h + s) > (void *)n->host_end)
	{
	  gomp_mutex_unlock (&acc_dev->lock);
	  gomp_fatal ("[%p,+%d] not mapped", (void *)h, (int)s);
	}

      assert (n->refcount != REFCOUNT_LINK);
      if (n->refcount != REFCOUNT_INFINITY)
	{
	  n->refcount++;
	  n->virtual_refcount++;
	}

      gomp_mutex_unlock (&acc_dev->lock);
    }
  else
    {
      const size_t mapnum = 1;

      gomp_mutex_unlock (&acc_dev->lock);

      goacc_aq aq = get_goacc_asyncqueue (async);

      struct target_mem_desc *tgt
	= gomp_map_vars_async (acc_dev, aq, mapnum, hostaddrs, NULL, sizes,
			       kinds, true, GOMP_MAP_VARS_OPENACC_ENTER_DATA);
      assert (tgt);
      assert (tgt->list_count == 1);
      n = tgt->list[0].key;
      assert (n);
      assert (n->refcount == 1);
      assert (n->virtual_refcount == 0);

      d = (void *) tgt->tgt_start;
    }

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

  return d;
}

void *
acc_create (void *h, size_t s)
{
  unsigned short kinds[1] = { GOMP_MAP_ALLOC };
  return goacc_enter_datum (&h, &s, &kinds, acc_async_sync);
}

void
acc_create_async (void *h, size_t s, int async)
{
  unsigned short kinds[1] = { GOMP_MAP_ALLOC };
  goacc_enter_datum (&h, &s, &kinds, async);
}

/* acc_present_or_create used to be what acc_create is now.  */
/* acc_pcreate is acc_present_or_create by a different name.  */
#ifdef HAVE_ATTRIBUTE_ALIAS
strong_alias (acc_create, acc_present_or_create)
strong_alias (acc_create, acc_pcreate)
#else
void *
acc_present_or_create (void *h, size_t s)
{
  return acc_create (h, s);
}

void *
acc_pcreate (void *h, size_t s)
{
  return acc_create (h, s);
}
#endif

void *
acc_copyin (void *h, size_t s)
{
  unsigned short kinds[1] = { GOMP_MAP_TO };
  return goacc_enter_datum (&h, &s, &kinds, acc_async_sync);
}

void
acc_copyin_async (void *h, size_t s, int async)
{
  unsigned short kinds[1] = { GOMP_MAP_TO };
  goacc_enter_datum (&h, &s, &kinds, async);
}

/* acc_present_or_copyin used to be what acc_copyin is now.  */
/* acc_pcopyin is acc_present_or_copyin by a different name.  */
#ifdef HAVE_ATTRIBUTE_ALIAS
strong_alias (acc_copyin, acc_present_or_copyin)
strong_alias (acc_copyin, acc_pcopyin)
#else
void *
acc_present_or_copyin (void *h, size_t s)
{
  return acc_copyin (h, s);
}

void *
acc_pcopyin (void *h, size_t s)
{
  return acc_copyin (h, s);
}
#endif


/* Exit a dynamic mapping for a single variable.  */

static void
goacc_exit_datum (void *h, size_t s, unsigned short kind, int async)
{
  /* No need to call lazy open, as the data must already have been
     mapped.  */

  kind &= 0xff;

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    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;
    }

  gomp_mutex_lock (&acc_dev->lock);

  splay_tree_key n = lookup_host (acc_dev, h, s);
  if (!n)
    /* PR92726, RP92970, PR92984: no-op.  */
    goto out;

  if ((uintptr_t) h < n->host_start || (uintptr_t) h + s > n->host_end)
    {
      size_t host_size = n->host_end - n->host_start;
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("[%p,+%d] outside mapped block [%p,+%d]",
		  (void *) h, (int) s, (void *) n->host_start, (int) host_size);
    }

  bool finalize = (kind == GOMP_MAP_DELETE
		   || kind == GOMP_MAP_FORCE_FROM);
  if (finalize)
    {
      if (n->refcount != REFCOUNT_INFINITY)
	n->refcount -= n->virtual_refcount;
      n->virtual_refcount = 0;
    }

  if (n->virtual_refcount > 0)
    {
      if (n->refcount != REFCOUNT_INFINITY)
	n->refcount--;
      n->virtual_refcount--;
    }
  else if (n->refcount > 0 && n->refcount != REFCOUNT_INFINITY)
    n->refcount--;

  if (n->refcount == 0)
    {
      goacc_aq aq = get_goacc_asyncqueue (async);

      bool copyout = (kind == GOMP_MAP_FROM
		      || kind == GOMP_MAP_FORCE_FROM);
      if (copyout)
	{
	  void *d = (void *) (n->tgt->tgt_start + n->tgt_offset
			      + (uintptr_t) h - n->host_start);
	  gomp_copy_dev2host (acc_dev, aq, h, d, s);
	}

      if (aq)
	/* TODO We can't do the 'is_tgt_unmapped' checking -- see the
	   'gomp_unref_tgt' comment in
	   <http://mid.mail-archive.com/878snl36eu.fsf@euler.schwinge.homeip.net>;
	   PR92881.  */
	gomp_remove_var_async (acc_dev, n, aq);
      else
	{
	  size_t num_mappings = 0;
	  /* If the target_mem_desc represents a single data mapping, we can
	     check that it is freed when this splay tree key's refcount reaches
	     zero.  Otherwise (e.g. for a 'GOMP_MAP_STRUCT' mapping with
	     multiple members), fall back to skipping the test.  */
	  for (size_t l_i = 0; l_i < n->tgt->list_count; ++l_i)
	    if (n->tgt->list[l_i].key)
	      ++num_mappings;
	  bool is_tgt_unmapped = gomp_remove_var (acc_dev, n);
	  assert (is_tgt_unmapped || num_mappings > 1);
	}
    }

 out:
  gomp_mutex_unlock (&acc_dev->lock);

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

void
acc_delete (void *h , size_t s)
{
  goacc_exit_datum (h, s, GOMP_MAP_RELEASE, acc_async_sync);
}

void
acc_delete_async (void *h , size_t s, int async)
{
  goacc_exit_datum (h, s, GOMP_MAP_RELEASE, async);
}

void
acc_delete_finalize (void *h , size_t s)
{
  goacc_exit_datum (h, s, GOMP_MAP_DELETE, acc_async_sync);
}

void
acc_delete_finalize_async (void *h , size_t s, int async)
{
  goacc_exit_datum (h, s, GOMP_MAP_DELETE, async);
}

void
acc_copyout (void *h, size_t s)
{
  goacc_exit_datum (h, s, GOMP_MAP_FROM, acc_async_sync);
}

void
acc_copyout_async (void *h, size_t s, int async)
{
  goacc_exit_datum (h, s, GOMP_MAP_FROM, async);
}

void
acc_copyout_finalize (void *h, size_t s)
{
  goacc_exit_datum (h, s, GOMP_MAP_FORCE_FROM, acc_async_sync);
}

void
acc_copyout_finalize_async (void *h, size_t s, int async)
{
  goacc_exit_datum (h, s, GOMP_MAP_FORCE_FROM, async);
}

static void
update_dev_host (int is_dev, void *h, size_t s, int async)
{
  splay_tree_key n;
  void *d;

  goacc_lazy_initialize ();

  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;

  if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return;

  /* Fortran optional arguments that are non-present result in a
     NULL host address here.  This can safely be ignored as it is
     not possible to 'update' a non-present optional argument.  */
  if (h == NULL)
    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;
    }

  gomp_mutex_lock (&acc_dev->lock);

  n = lookup_host (acc_dev, h, s);

  if (!n)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("[%p,%d] is not mapped", h, (int)s);
    }

  d = (void *) (n->tgt->tgt_start + n->tgt_offset
		+ (uintptr_t) h - n->host_start);

  goacc_aq aq = get_goacc_asyncqueue (async);

  if (is_dev)
    gomp_copy_host2dev (acc_dev, aq, d, h, s, /* TODO: cbuf? */ NULL);
  else
    gomp_copy_dev2host (acc_dev, aq, h, d, s);

  gomp_mutex_unlock (&acc_dev->lock);

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

void
acc_update_device (void *h, size_t s)
{
  update_dev_host (1, h, s, acc_async_sync);
}

void
acc_update_device_async (void *h, size_t s, int async)
{
  update_dev_host (1, h, s, async);
}

void
acc_update_self (void *h, size_t s)
{
  update_dev_host (0, h, s, acc_async_sync);
}

void
acc_update_self_async (void *h, size_t s, int async)
{
  update_dev_host (0, h, s, async);
}

void
acc_attach_async (void **hostaddr, int async)
{
  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;
  goacc_aq aq = get_goacc_asyncqueue (async);

  struct splay_tree_key_s cur_node;
  splay_tree_key n;

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return;

  gomp_mutex_lock (&acc_dev->lock);

  cur_node.host_start = (uintptr_t) hostaddr;
  cur_node.host_end = cur_node.host_start + sizeof (void *);
  n = splay_tree_lookup (&acc_dev->mem_map, &cur_node);

  if (n == NULL)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("struct not mapped for acc_attach");
    }

  gomp_attach_pointer (acc_dev, aq, &acc_dev->mem_map, n, (uintptr_t) hostaddr,
		       0, NULL);

  gomp_mutex_unlock (&acc_dev->lock);
}

void
acc_attach (void **hostaddr)
{
  acc_attach_async (hostaddr, acc_async_sync);
}

static void
goacc_detach_internal (void **hostaddr, int async, bool finalize)
{
  struct goacc_thread *thr = goacc_thread ();
  struct gomp_device_descr *acc_dev = thr->dev;
  struct splay_tree_key_s cur_node;
  splay_tree_key n;
  struct goacc_asyncqueue *aq = get_goacc_asyncqueue (async);

  if (thr->dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
    return;

  gomp_mutex_lock (&acc_dev->lock);

  cur_node.host_start = (uintptr_t) hostaddr;
  cur_node.host_end = cur_node.host_start + sizeof (void *);
  n = splay_tree_lookup (&acc_dev->mem_map, &cur_node);

  if (n == NULL)
    {
      gomp_mutex_unlock (&acc_dev->lock);
      gomp_fatal ("struct not mapped for acc_detach");
    }

  gomp_detach_pointer (acc_dev, aq, n, (uintptr_t) hostaddr, finalize, NULL);

  gomp_mutex_unlock (&acc_dev->lock);
}

void
acc_detach (void **hostaddr)
{
  goacc_detach_internal (hostaddr, acc_async_sync, false);
}

void
acc_detach_async (void **hostaddr, int async)
{
  goacc_detach_internal (hostaddr, async, false);
}

void
acc_detach_finalize (void **hostaddr)
{
  goacc_detach_internal (hostaddr, acc_async_sync, true);
}

void
acc_detach_finalize_async (void **hostaddr, int async)
{
  goacc_detach_internal (hostaddr, async, true);
}

/* Some types of (pointer) variables use several consecutive mappings, which
   must be treated as a group for enter/exit data directives.  This function
   returns the last mapping in such a group (inclusive), or POS for singleton
   mappings.  */

static int
find_group_last (int pos, size_t mapnum, size_t *sizes, unsigned short *kinds)
{
  unsigned char kind0 = kinds[pos] & 0xff;
  int first_pos = pos;

  switch (kind0)
    {
    case GOMP_MAP_TO_PSET:
      if (pos + 1 < mapnum
	  && (kinds[pos + 1] & 0xff) == GOMP_MAP_ATTACH)
	return pos + 1;

      while (pos + 1 < mapnum
	     && (kinds[pos + 1] & 0xff) == GOMP_MAP_POINTER)
	pos++;
      /* We expect at least one GOMP_MAP_POINTER (if not a single
	 GOMP_MAP_ATTACH) after a GOMP_MAP_TO_PSET.  */
      assert (pos > first_pos);
      break;

    case GOMP_MAP_STRUCT:
      pos += sizes[pos];
      break;

    case GOMP_MAP_POINTER:
    case GOMP_MAP_ALWAYS_POINTER:
      /* These mappings are only expected after some other mapping.  If we
	 see one by itself, something has gone wrong.  */
      gomp_fatal ("unexpected mapping");
      break;

    case GOMP_MAP_ATTACH:
      break;

    default:
      /* GOMP_MAP_ALWAYS_POINTER can only appear directly after some other
	 mapping.  */
      if (pos + 1 < mapnum)
	{
	  unsigned char kind1 = kinds[pos + 1] & 0xff;
	  if (kind1 == GOMP_MAP_ALWAYS_POINTER)
	    return pos + 1;
	}

      /* We can have a single GOMP_MAP_ATTACH mapping after a to/from
	 mapping.  */
      if (pos + 1 < mapnum
	  && (kinds[pos + 1] & 0xff) == GOMP_MAP_ATTACH)
	return pos + 1;

      /* We can have zero or more GOMP_MAP_POINTER mappings after a to/from
	 (etc.) mapping.  */
      while (pos + 1 < mapnum
	     && (kinds[pos + 1] & 0xff) == GOMP_MAP_POINTER)
	pos++;
    }

  return pos;
}

/* Map variables for OpenACC "enter data".  We can't just call
   gomp_map_vars_async once, because individual mapped variables might have
   "exit data" called for them at different times.  */

static void
goacc_enter_data_internal (struct gomp_device_descr *acc_dev, size_t mapnum,
			   void **hostaddrs, size_t *sizes,
			   unsigned short *kinds, goacc_aq aq)
{
  for (size_t i = 0; i < mapnum; i++)
    {
      int group_last = find_group_last (i, mapnum, sizes, kinds);

      gomp_map_vars_async (acc_dev, aq,
			   (group_last - i) + 1,
			   &hostaddrs[i], NULL,
			   &sizes[i], &kinds[i], true,
			   GOMP_MAP_VARS_OPENACC_ENTER_DATA);

      i = group_last;
    }
}

/* Unmap variables for OpenACC "exit data".  */

static void
goacc_exit_data_internal (struct gomp_device_descr *acc_dev, size_t mapnum,
			  void **hostaddrs, size_t *sizes,
			  unsigned short *kinds, goacc_aq aq)
{
  gomp_mutex_lock (&acc_dev->lock);

  /* Handle "detach" before copyback/deletion of mapped data.  */
  for (size_t i = 0; i < mapnum; ++i)
    {
      unsigned char kind = kinds[i] & 0xff;
      bool finalize = false;
      switch (kind)
	{
	case GOMP_MAP_FORCE_DETACH:
	  finalize = true;
	  /* Fallthrough.  */

	case GOMP_MAP_DETACH:
	  {
	    struct splay_tree_key_s cur_node;
	    uintptr_t hostaddr = (uintptr_t) hostaddrs[i];
	    cur_node.host_start = hostaddr;
	    cur_node.host_end = cur_node.host_start + sizeof (void *);
	    splay_tree_key n
	      = splay_tree_lookup (&acc_dev->mem_map, &cur_node);

	    if (n == NULL)
	      {
		gomp_mutex_unlock (&acc_dev->lock);
		gomp_fatal ("struct not mapped for detach operation");
	      }

	    gomp_detach_pointer (acc_dev, aq, n, hostaddr, finalize, NULL);
	  }
	  break;
	default:
	  ;
	}
    }

  for (size_t i = 0; i < mapnum; ++i)
    {
      unsigned char kind = kinds[i] & 0xff;
      bool copyfrom = false;
      bool finalize = false;

      if (kind == GOMP_MAP_FORCE_FROM
	  || kind == GOMP_MAP_DELETE
	  || kind == GOMP_MAP_FORCE_DETACH)
	finalize = true;

      switch (kind)
	{
	case GOMP_MAP_FROM:
	case GOMP_MAP_FORCE_FROM:
	  copyfrom = true;
	  /* Fallthrough.  */

	case GOMP_MAP_TO_PSET:
	case GOMP_MAP_POINTER:
	case GOMP_MAP_DELETE:
	case GOMP_MAP_RELEASE:
	case GOMP_MAP_DETACH:
	case GOMP_MAP_FORCE_DETACH:
	  {
	    struct splay_tree_key_s cur_node;
	    size_t size;
	    if (kind == GOMP_MAP_POINTER
		|| kind == GOMP_MAP_DETACH
		|| kind == GOMP_MAP_FORCE_DETACH)
	      size = sizeof (void *);
	    else
	      size = sizes[i];
	    cur_node.host_start = (uintptr_t) hostaddrs[i];
	    cur_node.host_end = cur_node.host_start + size;
	    splay_tree_key n
	      = splay_tree_lookup (&acc_dev->mem_map, &cur_node);

	    if (n == NULL)
	      continue;

	    if (finalize)
	      {
		if (n->refcount != REFCOUNT_INFINITY)
		  n->refcount -= n->virtual_refcount;
		n->virtual_refcount = 0;
	      }

	    if (n->virtual_refcount > 0)
	      {
		if (n->refcount != REFCOUNT_INFINITY)
		  n->refcount--;
		n->virtual_refcount--;
	      }
	    else if (n->refcount > 0 && n->refcount != REFCOUNT_INFINITY)
	      n->refcount--;

	    if (n->refcount == 0)
	      {
		if (copyfrom)
		  {
		    void *d = (void *) (n->tgt->tgt_start + n->tgt_offset
					+ cur_node.host_start - n->host_start);
		    gomp_copy_dev2host (acc_dev, aq,
					(void *) cur_node.host_start, d,
					cur_node.host_end - cur_node.host_start);
		  }

		if (aq)
		  /* TODO We can't do the 'is_tgt_unmapped' checking -- see the
		     'gomp_unref_tgt' comment in
		     <http://mid.mail-archive.com/878snl36eu.fsf@euler.schwinge.homeip.net>;
		     PR92881.  */
		  gomp_remove_var_async (acc_dev, n, aq);
		else
		  {
		    size_t num_mappings = 0;
		    /* If the target_mem_desc represents a single data mapping,
		       we can check that it is freed when this splay tree key's
		       refcount reaches zero.  Otherwise (e.g. for a
		       'GOMP_MAP_STRUCT' mapping with multiple members), fall
		       back to skipping the test.  */
		    for (size_t l_i = 0; l_i < n->tgt->list_count; ++l_i)
		      if (n->tgt->list[l_i].key)
			++num_mappings;
		    bool is_tgt_unmapped = gomp_remove_var (acc_dev, n);
		    assert (is_tgt_unmapped || num_mappings > 1);
		  }
	      }
	  }
	  break;

	case GOMP_MAP_STRUCT:
	  /* Skip the 'GOMP_MAP_STRUCT' itself, and use the regular processing
	     for all its entries.  This special handling exists for GCC 10.1
	     compatibility; afterwards, we're not generating these no-op
	     'GOMP_MAP_STRUCT's anymore.  */
	  break;

	default:
	  gomp_fatal (">>>> goacc_exit_data_internal UNHANDLED kind 0x%.2x",
			  kind);
	}
    }

  gomp_mutex_unlock (&acc_dev->lock);
}

void
GOACC_enter_exit_data (int flags_m, size_t mapnum, void **hostaddrs,
		       size_t *sizes, unsigned short *kinds, int async,
		       int num_waits, ...)
{
  int flags = GOACC_FLAGS_UNMARSHAL (flags_m);

  struct goacc_thread *thr;
  struct gomp_device_descr *acc_dev;
  bool data_enter = false;
  size_t i;

  goacc_lazy_initialize ();

  thr = goacc_thread ();
  acc_dev = thr->dev;

  /* Determine if this is an "acc enter data".  */
  for (i = 0; i < mapnum; ++i)
    {
      unsigned char kind = kinds[i] & 0xff;

      if (kind == GOMP_MAP_POINTER
	  || kind == GOMP_MAP_TO_PSET
	  || kind == GOMP_MAP_STRUCT)
	continue;

      if (kind == GOMP_MAP_FORCE_ALLOC
	  || kind == GOMP_MAP_FORCE_PRESENT
	  || kind == GOMP_MAP_ATTACH
	  || kind == GOMP_MAP_FORCE_TO
	  || kind == GOMP_MAP_TO
	  || kind == GOMP_MAP_ALLOC)
	{
	  data_enter = true;
	  break;
	}

      if (kind == GOMP_MAP_RELEASE
	  || kind == GOMP_MAP_DELETE
	  || kind == GOMP_MAP_DETACH
	  || kind == GOMP_MAP_FORCE_DETACH
	  || kind == GOMP_MAP_FROM
	  || kind == GOMP_MAP_FORCE_FROM)
	break;

      gomp_fatal (">>>> GOACC_enter_exit_data UNHANDLED kind 0x%.2x",
		      kind);
    }

  bool profiling_p = GOACC_PROFILING_DISPATCH_P (true);

  acc_prof_info prof_info;
  if (profiling_p)
    {
      thr->prof_info = &prof_info;

      prof_info.event_type
	= data_enter ? acc_ev_enter_data_start : acc_ev_exit_data_start;
      prof_info.valid_bytes = _ACC_PROF_INFO_VALID_BYTES;
      prof_info.version = _ACC_PROF_INFO_VERSION;
      prof_info.device_type = acc_device_type (acc_dev->type);
      prof_info.device_number = acc_dev->target_id;
      prof_info.thread_id = -1;
      prof_info.async = async;
      prof_info.async_queue = prof_info.async;
      prof_info.src_file = NULL;
      prof_info.func_name = NULL;
      prof_info.line_no = -1;
      prof_info.end_line_no = -1;
      prof_info.func_line_no = -1;
      prof_info.func_end_line_no = -1;
    }
  acc_event_info enter_exit_data_event_info;
  if (profiling_p)
    {
      enter_exit_data_event_info.other_event.event_type
	= prof_info.event_type;
      enter_exit_data_event_info.other_event.valid_bytes
	= _ACC_OTHER_EVENT_INFO_VALID_BYTES;
      enter_exit_data_event_info.other_event.parent_construct
	= data_enter ? acc_construct_enter_data : acc_construct_exit_data;
      enter_exit_data_event_info.other_event.implicit = 0;
      enter_exit_data_event_info.other_event.tool_info = NULL;
    }
  acc_api_info api_info;
  if (profiling_p)
    {
      thr->api_info = &api_info;

      api_info.device_api = acc_device_api_none;
      api_info.valid_bytes = _ACC_API_INFO_VALID_BYTES;
      api_info.device_type = prof_info.device_type;
      api_info.vendor = -1;
      api_info.device_handle = NULL;
      api_info.context_handle = NULL;
      api_info.async_handle = NULL;
    }

  if (profiling_p)
    goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
			      &api_info);

  if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
      || (flags & GOACC_FLAG_HOST_FALLBACK))
    {
      prof_info.device_type = acc_device_host;
      api_info.device_type = prof_info.device_type;

      goto out_prof;
    }

  if (num_waits)
    {
      va_list ap;

      va_start (ap, num_waits);
      goacc_wait (async, num_waits, &ap);
      va_end (ap);
    }

  goacc_aq aq = get_goacc_asyncqueue (async);

  if (data_enter)
    goacc_enter_data_internal (acc_dev, mapnum, hostaddrs, sizes, kinds, aq);
  else
    goacc_exit_data_internal (acc_dev, mapnum, hostaddrs, sizes, kinds, aq);

 out_prof:
  if (profiling_p)
    {
      prof_info.event_type
	= data_enter ? acc_ev_enter_data_end : acc_ev_exit_data_end;
      enter_exit_data_event_info.other_event.event_type = prof_info.event_type;
      goacc_profiling_dispatch (&prof_info, &enter_exit_data_event_info,
				&api_info);

      thr->prof_info = NULL;
      thr->api_info = NULL;
    }
}