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
|
/* OpenACC Runtime initialization routines
Copyright (C) 2013-2016 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 "config.h"
#include "libgomp.h"
#include "gomp-constants.h"
#include "oacc-int.h"
#include <stdint.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;
}
/* Return block containing [D->S), or NULL if not contained.
The list isn't ordered by device address, so we have to iterate
over the whole array. This is not expected to be a common
operation. The device lock associated with TGT must be locked on entry, and
remains locked on exit. */
static splay_tree_key
lookup_dev (struct target_mem_desc *tgt, void *d, size_t s)
{
int i;
struct target_mem_desc *t;
if (!tgt)
return NULL;
for (t = tgt; t != NULL; t = t->prev)
{
if (t->tgt_start <= (uintptr_t) d && t->tgt_end >= (uintptr_t) d + s)
break;
}
if (!t)
return NULL;
for (i = 0; i < t->list_count; i++)
{
void * offset;
splay_tree_key k = &t->array[i].key;
offset = d - t->tgt_start + k->tgt_offset;
if (k->host_start + offset <= (void *) k->host_end)
return k;
}
return NULL;
}
/* 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);
return thr->dev->alloc_func (thr->dev->target_id, s);
}
/* OpenACC 2.0a (3.2.16) doesn't specify what to do in the event
the device address is mapped. We choose to check if it mapped,
and if it is, to unmap it. */
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);
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->openacc.data_environ, d, 1)))
{
void *offset;
offset = d - k->tgt->tgt_start + k->tgt_offset;
gomp_mutex_unlock (&acc_dev->lock);
acc_unmap_data ((void *)(k->host_start + offset));
}
else
gomp_mutex_unlock (&acc_dev->lock);
acc_dev->free_func (acc_dev->target_id, d);
}
void
acc_memcpy_to_device (void *d, void *h, size_t s)
{
/* 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)
{
memmove (d, h, s);
return;
}
thr->dev->host2dev_func (thr->dev->target_id, d, h, s);
}
void
acc_memcpy_from_device (void *h, void *d, size_t s)
{
/* 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)
{
memmove (h, d, s);
return;
}
thr->dev->dev2host_func (thr->dev->target_id, h, d, s);
}
/* 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;
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;
gomp_mutex_lock (&acc_dev->lock);
n = lookup_dev (acc_dev->openacc.data_environ, 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;
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)
{
struct target_mem_desc *tgt = NULL;
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);
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->openacc.data_environ, 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);
tgt = gomp_map_vars (acc_dev, mapnum, &hostaddrs, &devaddrs, &sizes,
&kinds, true, GOMP_MAP_VARS_OPENACC);
}
gomp_mutex_lock (&acc_dev->lock);
tgt->prev = acc_dev->openacc.data_environ;
acc_dev->openacc.data_environ = tgt;
gomp_mutex_unlock (&acc_dev->lock);
}
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;
size_t host_size;
gomp_mutex_lock (&acc_dev->lock);
splay_tree_key n = lookup_host (acc_dev, h, 1);
struct target_mem_desc *t;
if (!n)
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("%p is not a mapped block", (void *)h);
}
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);
}
t = n->tgt;
if (t->refcount == 2)
{
struct target_mem_desc *tp;
/* This is the last reference, so pull the descriptor off the
chain. This avoids gomp_unmap_vars via gomp_unmap_tgt from
freeing the device memory. */
t->tgt_end = 0;
t->to_free = 0;
for (tp = NULL, t = acc_dev->openacc.data_environ; t != NULL;
tp = t, t = t->prev)
if (n->tgt == t)
{
if (tp)
tp->prev = t->prev;
else
acc_dev->openacc.data_environ = t->prev;
break;
}
}
gomp_mutex_unlock (&acc_dev->lock);
gomp_unmap_vars (t, true);
}
#define FLAG_PRESENT (1 << 0)
#define FLAG_CREATE (1 << 1)
#define FLAG_COPY (1 << 2)
static void *
present_create_copy (unsigned f, void *h, size_t s)
{
void *d;
splay_tree_key n;
if (!h || !s)
gomp_fatal ("[%p,+%d] is a bad range", (void *)h, (int)s);
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 h;
gomp_mutex_lock (&acc_dev->lock);
n = lookup_host (acc_dev, h, s);
if (n)
{
/* Present. */
d = (void *) (n->tgt->tgt_start + n->tgt_offset);
if (!(f & FLAG_PRESENT))
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("[%p,+%d] already mapped to [%p,+%d]",
(void *)h, (int)s, (void *)d, (int)s);
}
if ((h + s) > (void *)n->host_end)
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("[%p,+%d] not mapped", (void *)h, (int)s);
}
gomp_mutex_unlock (&acc_dev->lock);
}
else if (!(f & FLAG_CREATE))
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("[%p,+%d] not mapped", (void *)h, (int)s);
}
else
{
struct target_mem_desc *tgt;
size_t mapnum = 1;
unsigned short kinds;
void *hostaddrs = h;
if (f & FLAG_COPY)
kinds = GOMP_MAP_TO;
else
kinds = GOMP_MAP_ALLOC;
gomp_mutex_unlock (&acc_dev->lock);
tgt = gomp_map_vars (acc_dev, mapnum, &hostaddrs, NULL, &s, &kinds, true,
GOMP_MAP_VARS_OPENACC);
gomp_mutex_lock (&acc_dev->lock);
d = tgt->to_free;
tgt->prev = acc_dev->openacc.data_environ;
acc_dev->openacc.data_environ = tgt;
gomp_mutex_unlock (&acc_dev->lock);
}
return d;
}
void *
acc_create (void *h, size_t s)
{
return present_create_copy (FLAG_CREATE, h, s);
}
void *
acc_copyin (void *h, size_t s)
{
return present_create_copy (FLAG_CREATE | FLAG_COPY, h, s);
}
void *
acc_present_or_create (void *h, size_t s)
{
return present_create_copy (FLAG_PRESENT | FLAG_CREATE, h, s);
}
void *
acc_present_or_copyin (void *h, size_t s)
{
return present_create_copy (FLAG_PRESENT | FLAG_CREATE | FLAG_COPY, h, s);
}
#define FLAG_COPYOUT (1 << 0)
static void
delete_copyout (unsigned f, void *h, size_t s)
{
size_t host_size;
splay_tree_key n;
void *d;
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
return;
gomp_mutex_lock (&acc_dev->lock);
n = lookup_host (acc_dev, h, s);
/* No need to call lazy open, as the data must already have been
mapped. */
if (!n)
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("[%p,%d] is not mapped", (void *)h, (int)s);
}
d = (void *) (n->tgt->tgt_start + n->tgt_offset
+ (uintptr_t) h - n->host_start);
host_size = n->host_end - n->host_start;
if (n->host_start != (uintptr_t) h || host_size != s)
{
gomp_mutex_unlock (&acc_dev->lock);
gomp_fatal ("[%p,%d] surrounds2 [%p,+%d]",
(void *) n->host_start, (int) host_size, (void *) h, (int) s);
}
gomp_mutex_unlock (&acc_dev->lock);
if (f & FLAG_COPYOUT)
acc_dev->dev2host_func (acc_dev->target_id, h, d, s);
acc_unmap_data (h);
acc_dev->free_func (acc_dev->target_id, d);
}
void
acc_delete (void *h , size_t s)
{
delete_copyout (0, h, s);
}
void acc_copyout (void *h, size_t s)
{
delete_copyout (FLAG_COPYOUT, h, s);
}
static void
update_dev_host (int is_dev, void *h, size_t s)
{
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;
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);
gomp_mutex_unlock (&acc_dev->lock);
if (is_dev)
acc_dev->host2dev_func (acc_dev->target_id, d, h, s);
else
acc_dev->dev2host_func (acc_dev->target_id, h, d, s);
}
void
acc_update_device (void *h, size_t s)
{
update_dev_host (1, h, s);
}
void
acc_update_self (void *h, size_t s)
{
update_dev_host (0, h, s);
}
void
gomp_acc_insert_pointer (size_t mapnum, void **hostaddrs, size_t *sizes,
void *kinds)
{
struct target_mem_desc *tgt;
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
gomp_debug (0, " %s: prepare mappings\n", __FUNCTION__);
tgt = gomp_map_vars (acc_dev, mapnum, hostaddrs,
NULL, sizes, kinds, true, GOMP_MAP_VARS_OPENACC);
gomp_debug (0, " %s: mappings prepared\n", __FUNCTION__);
gomp_mutex_lock (&acc_dev->lock);
tgt->prev = acc_dev->openacc.data_environ;
acc_dev->openacc.data_environ = tgt;
gomp_mutex_unlock (&acc_dev->lock);
}
void
gomp_acc_remove_pointer (void *h, bool force_copyfrom, int async, int mapnum)
{
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
splay_tree_key n;
struct target_mem_desc *t;
int minrefs = (mapnum == 1) ? 2 : 3;
gomp_mutex_lock (&acc_dev->lock);
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);
}
gomp_debug (0, " %s: restore mappings\n", __FUNCTION__);
t = n->tgt;
struct target_mem_desc *tp;
if (t->refcount == minrefs)
{
/* This is the last reference, so pull the descriptor off the
chain. This avoids gomp_unmap_vars via gomp_unmap_tgt from
freeing the device memory. */
t->tgt_end = 0;
t->to_free = 0;
for (tp = NULL, t = acc_dev->openacc.data_environ; t != NULL;
tp = t, t = t->prev)
{
if (n->tgt == t)
{
if (tp)
tp->prev = t->prev;
else
acc_dev->openacc.data_environ = t->prev;
break;
}
}
}
if (force_copyfrom)
t->list[0].copy_from = 1;
gomp_mutex_unlock (&acc_dev->lock);
/* If running synchronously, unmap immediately. */
if (async < acc_async_noval)
gomp_unmap_vars (t, true);
else
{
gomp_copy_from_async (t);
acc_dev->openacc.register_async_cleanup_func (t);
}
gomp_debug (0, " %s: mappings restored\n", __FUNCTION__);
}
|