libgomp/oacc-async.c

   1 /* OpenACC Runtime Library Definitions.
   2
   3    Copyright (C) 2013-2021 Free Software Foundation, Inc.
   4
   5    Contributed by Mentor Embedded.
   6
   7    This file is part of the GNU Offloading and Multi Processing Library
   8    (libgomp).
   9
  10    Libgomp is free software; you can redistribute it and/or modify it
  11    under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3, or (at your option)
  13    any later version.
  14
  15    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  16    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18    more details.
  19
  20    Under Section 7 of GPL version 3, you are granted additional
  21    permissions described in the GCC Runtime Library Exception, version
  22    3.1, as published by the Free Software Foundation.
  23
  24    You should have received a copy of the GNU General Public License and
  25    a copy of the GCC Runtime Library Exception along with this program;
  26    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  27    <http://www.gnu.org/licenses/>.  */
  28
  29 #include <assert.h>
  30 #include <string.h>
  31 #include "openacc.h"
  32 #include "libgomp.h"
  33 #include "oacc-int.h"
  34
  35 static struct goacc_thread *
  36 get_goacc_thread (void)
  37 {
  38   struct goacc_thread *thr = goacc_thread ();
  39
  40   if (!thr || !thr->dev)
  41     gomp_fatal ("no device active");
  42
  43   return thr;
  44 }
  45
  46 static int
  47 validate_async_val (int async)
  48 {
  49   if (!async_valid_p (async))
  50     gomp_fatal ("invalid async-argument: %d", async);
  51
  52   if (async == acc_async_sync)
  53     return -1;
  54
  55   if (async == acc_async_noval)
  56     return 0;
  57
  58   if (async >= 0)
  59     /* TODO: we reserve 0 for acc_async_noval before we can clarify the
  60        semantics of "default_async".  */
  61     return 1 + async;
  62   else
  63     __builtin_unreachable ();
  64 }
  65
  66 /* Return the asyncqueue to be used for OpenACC async-argument ASYNC.  This
  67    might return NULL if no asyncqueue is to be used.  Otherwise, if CREATE,
  68    create the asyncqueue if it doesn't exist yet.
  69
  70    Unless CREATE, this will not generate any OpenACC Profiling Interface
  71    events.  */
  72
  73 attribute_hidden struct goacc_asyncqueue *
  74 lookup_goacc_asyncqueue (struct goacc_thread *thr, bool create, int async)
  75 {
  76   async = validate_async_val (async);
  77   if (async < 0)
  78     return NULL;
  79
  80   struct goacc_asyncqueue *ret_aq = NULL;
  81   struct gomp_device_descr *dev = thr->dev;
  82
  83   gomp_mutex_lock (&dev->openacc.async.lock);
  84
  85   if (!create
  86       && (async >= dev->openacc.async.nasyncqueue
  87           || !dev->openacc.async.asyncqueue[async]))
  88     goto end;
  89
  90   if (async >= dev->openacc.async.nasyncqueue)
  91     {
  92       int diff = async + 1 - dev->openacc.async.nasyncqueue;
  93       dev->openacc.async.asyncqueue
  94         = gomp_realloc (dev->openacc.async.asyncqueue,
  95                         sizeof (goacc_aq) * (async + 1));
  96       memset (dev->openacc.async.asyncqueue + dev->openacc.async.nasyncqueue,
  97               0, sizeof (goacc_aq) * diff);
  98       dev->openacc.async.nasyncqueue = async + 1;
  99     }
 100
 101   if (!dev->openacc.async.asyncqueue[async])
 102     {
 103       dev->openacc.async.asyncqueue[async]
 104         = dev->openacc.async.construct_func (dev->target_id);
 105
 106       if (!dev->openacc.async.asyncqueue[async])
 107         {
 108           gomp_mutex_unlock (&dev->openacc.async.lock);
 109           gomp_fatal ("async %d creation failed", async);
 110         }
 111
 112       /* Link new async queue into active list.  */
 113       goacc_aq_list n = gomp_malloc (sizeof (struct goacc_asyncqueue_list));
 114       n->aq = dev->openacc.async.asyncqueue[async];
 115       n->next = dev->openacc.async.active;
 116       dev->openacc.async.active = n;
 117     }
 118
 119   ret_aq = dev->openacc.async.asyncqueue[async];
 120
 121  end:
 122   gomp_mutex_unlock (&dev->openacc.async.lock);
 123   return ret_aq;
 124 }
 125
 126 /* Return the asyncqueue to be used for OpenACC async-argument ASYNC.  This
 127    might return NULL if no asyncqueue is to be used.  Otherwise, create the
 128    asyncqueue if it doesn't exist yet.  */
 129
 130 attribute_hidden struct goacc_asyncqueue *
 131 get_goacc_asyncqueue (int async)
 132 {
 133   struct goacc_thread *thr = get_goacc_thread ();
 134   return lookup_goacc_asyncqueue (thr, true, async);
 135 }
 136
 137 int
 138 acc_async_test (int async)
 139 {
 140   struct goacc_thread *thr = goacc_thread ();
 141
 142   if (!thr || !thr->dev)
 143     gomp_fatal ("no device active");
 144
 145   goacc_aq aq = lookup_goacc_asyncqueue (thr, false, async);
 146   if (!aq)
 147     return 1;
 148
 149   acc_prof_info prof_info;
 150   acc_api_info api_info;
 151   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 152   if (profiling_p)
 153     {
 154       prof_info.async = async;
 155       prof_info.async_queue = prof_info.async;
 156     }
 157
 158   int res = thr->dev->openacc.async.test_func (aq);
 159
 160   if (profiling_p)
 161     {
 162       thr->prof_info = NULL;
 163       thr->api_info = NULL;
 164     }
 165
 166   return res;
 167 }
 168
 169 int
 170 acc_async_test_all (void)
 171 {
 172   struct goacc_thread *thr = get_goacc_thread ();
 173
 174   acc_prof_info prof_info;
 175   acc_api_info api_info;
 176   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 177
 178   int ret = 1;
 179   gomp_mutex_lock (&thr->dev->openacc.async.lock);
 180   for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
 181     if (!thr->dev->openacc.async.test_func (l->aq))
 182       {
 183         ret = 0;
 184         break;
 185       }
 186   gomp_mutex_unlock (&thr->dev->openacc.async.lock);
 187
 188   if (profiling_p)
 189     {
 190       thr->prof_info = NULL;
 191       thr->api_info = NULL;
 192     }
 193
 194   return ret;
 195 }
 196
 197 void
 198 acc_wait (int async)
 199 {
 200   struct goacc_thread *thr = get_goacc_thread ();
 201
 202   goacc_aq aq = lookup_goacc_asyncqueue (thr, false, async);
 203   if (!aq)
 204     return;
 205
 206   acc_prof_info prof_info;
 207   acc_api_info api_info;
 208   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 209   if (profiling_p)
 210     {
 211       prof_info.async = async;
 212       prof_info.async_queue = prof_info.async;
 213     }
 214
 215   if (!thr->dev->openacc.async.synchronize_func (aq))
 216     gomp_fatal ("wait on %d failed", async);
 217
 218   if (profiling_p)
 219     {
 220       thr->prof_info = NULL;
 221       thr->api_info = NULL;
 222     }
 223 }
 224
 225 /* acc_async_wait is an OpenACC 1.0 compatibility name for acc_wait.  */
 226 #ifdef HAVE_ATTRIBUTE_ALIAS
 227 strong_alias (acc_wait, acc_async_wait)
 228 #else
 229 void
 230 acc_async_wait (int async)
 231 {
 232   acc_wait (async);
 233 }
 234 #endif
 235
 236 void
 237 acc_wait_async (int async1, int async2)
 238 {
 239   struct goacc_thread *thr = get_goacc_thread ();
 240
 241   goacc_aq aq1 = lookup_goacc_asyncqueue (thr, false, async1);
 242   /* TODO: Is this also correct for acc_async_sync, assuming that in this case,
 243      we'll always be synchronous anyways?  */
 244   if (!aq1)
 245     return;
 246
 247   acc_prof_info prof_info;
 248   acc_api_info api_info;
 249   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 250   if (profiling_p)
 251     {
 252       prof_info.async = async2;
 253       prof_info.async_queue = prof_info.async;
 254     }
 255
 256   goacc_aq aq2 = lookup_goacc_asyncqueue (thr, true, async2);
 257   /* An async queue is always synchronized with itself.  */
 258   if (aq1 == aq2)
 259     goto out_prof;
 260
 261   if (aq2)
 262     {
 263       if (!thr->dev->openacc.async.serialize_func (aq1, aq2))
 264         gomp_fatal ("ordering of async ids %d and %d failed", async1, async2);
 265     }
 266   else
 267     {
 268       /* TODO: Local thread synchronization.
 269          Necessary for the "async2 == acc_async_sync" case, or can just skip?  */
 270       if (!thr->dev->openacc.async.synchronize_func (aq1))
 271         gomp_fatal ("wait on %d failed", async1);
 272     }
 273
 274  out_prof:
 275   if (profiling_p)
 276     {
 277       thr->prof_info = NULL;
 278       thr->api_info = NULL;
 279     }
 280 }
 281
 282 void
 283 acc_wait_all (void)
 284 {
 285   struct goacc_thread *thr = goacc_thread ();
 286
 287   acc_prof_info prof_info;
 288   acc_api_info api_info;
 289   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 290
 291   bool ret = true;
 292   gomp_mutex_lock (&thr->dev->openacc.async.lock);
 293   for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
 294     ret &= thr->dev->openacc.async.synchronize_func (l->aq);
 295   gomp_mutex_unlock (&thr->dev->openacc.async.lock);
 296
 297   if (profiling_p)
 298     {
 299       thr->prof_info = NULL;
 300       thr->api_info = NULL;
 301     }
 302
 303   if (!ret)
 304     gomp_fatal ("wait all failed");
 305 }
 306
 307 /* acc_async_wait_all is an OpenACC 1.0 compatibility name for acc_wait_all.  */
 308 #ifdef HAVE_ATTRIBUTE_ALIAS
 309 strong_alias (acc_wait_all, acc_async_wait_all)
 310 #else
 311 void
 312 acc_async_wait_all (void)
 313 {
 314   acc_wait_all ();
 315 }
 316 #endif
 317
 318 void
 319 acc_wait_all_async (int async)
 320 {
 321   struct goacc_thread *thr = get_goacc_thread ();
 322
 323   acc_prof_info prof_info;
 324   acc_api_info api_info;
 325   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 326   if (profiling_p)
 327     {
 328       prof_info.async = async;
 329       prof_info.async_queue = prof_info.async;
 330     }
 331
 332   goacc_aq waiting_queue = lookup_goacc_asyncqueue (thr, true, async);
 333
 334   bool ret = true;
 335   gomp_mutex_lock (&thr->dev->openacc.async.lock);
 336   for (goacc_aq_list l = thr->dev->openacc.async.active; l; l = l->next)
 337     {
 338       if (waiting_queue)
 339         ret &= thr->dev->openacc.async.serialize_func (l->aq, waiting_queue);
 340       else
 341         /* TODO: Local thread synchronization.
 342            Necessary for the "async2 == acc_async_sync" case, or can just skip?  */
 343         ret &= thr->dev->openacc.async.synchronize_func (l->aq);
 344     }
 345   gomp_mutex_unlock (&thr->dev->openacc.async.lock);
 346
 347   if (profiling_p)
 348     {
 349       thr->prof_info = NULL;
 350       thr->api_info = NULL;
 351     }
 352
 353   if (!ret)
 354     gomp_fatal ("wait all async(%d) failed", async);
 355 }
 356
 357 void
 358 GOACC_wait (int async, int num_waits, ...)
 359 {
 360   goacc_lazy_initialize ();
 361
 362   struct goacc_thread *thr = goacc_thread ();
 363
 364   /* No nesting.  */
 365   assert (thr->prof_info == NULL);
 366   assert (thr->api_info == NULL);
 367   acc_prof_info prof_info;
 368   acc_api_info api_info;
 369   bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
 370   if (profiling_p)
 371     {
 372       prof_info.async = async;
 373       prof_info.async_queue = prof_info.async;
 374     }
 375
 376   if (num_waits)
 377     {
 378       va_list ap;
 379
 380       va_start (ap, num_waits);
 381       goacc_wait (async, num_waits, &ap);
 382       va_end (ap);
 383     }
 384   else if (async == acc_async_sync)
 385     acc_wait_all ();
 386   else
 387     acc_wait_all_async (async);
 388
 389   if (profiling_p)
 390     {
 391       thr->prof_info = NULL;
 392       thr->api_info = NULL;
 393     }
 394 }
 395
 396 attribute_hidden void
 397 goacc_wait (int async, int num_waits, va_list *ap)
 398 {
 399   while (num_waits--)
 400     {
 401       int qid = va_arg (*ap, int);
 402
 403       /* Waiting on ACC_ASYNC_NOVAL maps to 'wait all'.  */
 404       if (qid == acc_async_noval)
 405         {
 406           if (async == acc_async_sync)
 407             acc_wait_all ();
 408           else
 409             acc_wait_all_async (async);
 410           break;
 411         }
 412
 413       if (acc_async_test (qid))
 414         continue;
 415
 416       if (async == acc_async_sync)
 417         acc_wait (qid);
 418       else if (qid == async)
 419         /* If we're waiting on the same asynchronous queue as we're
 420            launching on, the queue itself will order work as
 421            required, so there's no need to wait explicitly.  */
 422         ;
 423       else
 424         acc_wait_async (qid, async);
 425     }
 426 }
 427
 428 attribute_hidden void
 429 goacc_async_free (struct gomp_device_descr *devicep,
 430                   struct goacc_asyncqueue *aq, void *ptr)
 431 {
 432   if (!aq)
 433     free (ptr);
 434   else
 435     devicep->openacc.async.queue_callback_func (aq, free, ptr);
 436 }
 437
 438 /* This function initializes the asyncqueues for the device specified by
 439    DEVICEP.  TODO DEVICEP must be locked on entry, and remains locked on
 440    return.  */
 441
 442 attribute_hidden void
 443 goacc_init_asyncqueues (struct gomp_device_descr *devicep)
 444 {
 445   devicep->openacc.async.nasyncqueue = 0;
 446   devicep->openacc.async.asyncqueue = NULL;
 447   devicep->openacc.async.active = NULL;
 448   gomp_mutex_init (&devicep->openacc.async.lock);
 449 }
 450
 451 /* This function finalizes the asyncqueues for the device specified by DEVICEP.
 452    TODO DEVICEP must be locked on entry, and remains locked on return.  */
 453
 454 attribute_hidden bool
 455 goacc_fini_asyncqueues (struct gomp_device_descr *devicep)
 456 {
 457   bool ret = true;
 458   gomp_mutex_lock (&devicep->openacc.async.lock);
 459   if (devicep->openacc.async.nasyncqueue > 0)
 460     {
 461       goacc_aq_list next;
 462       for (goacc_aq_list l = devicep->openacc.async.active; l; l = next)
 463         {
 464           ret &= devicep->openacc.async.destruct_func (l->aq);
 465           next = l->next;
 466           free (l);
 467         }
 468       free (devicep->openacc.async.asyncqueue);
 469       devicep->openacc.async.nasyncqueue = 0;
 470       devicep->openacc.async.asyncqueue = NULL;
 471       devicep->openacc.async.active = NULL;
 472     }
 473   gomp_mutex_unlock (&devicep->openacc.async.lock);
 474   gomp_mutex_destroy (&devicep->openacc.async.lock);
 475   return ret;
 476 }