1/* OpenACC Runtime Library: CUDA support glue.
2
3   Copyright (C) 2014-2020 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 "openacc.h"
30#include "libgomp.h"
31#include "oacc-int.h"
32#include <assert.h>
33
34void *
35acc_get_current_cuda_device (void)
36{
37  struct goacc_thread *thr = goacc_thread ();
38
39  void *ret = NULL;
40  if (thr && thr->dev && thr->dev->openacc.cuda.get_current_device_func)
41    {
42      acc_prof_info prof_info;
43      acc_api_info api_info;
44      bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
45
46      ret = thr->dev->openacc.cuda.get_current_device_func ();
47
48      if (profiling_p)
49	{
50	  thr->prof_info = NULL;
51	  thr->api_info = NULL;
52	}
53    }
54
55  return ret;
56}
57
58void *
59acc_get_current_cuda_context (void)
60{
61  struct goacc_thread *thr = goacc_thread ();
62
63  void *ret = NULL;
64  if (thr && thr->dev && thr->dev->openacc.cuda.get_current_context_func)
65    {
66      acc_prof_info prof_info;
67      acc_api_info api_info;
68      bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
69
70      ret = thr->dev->openacc.cuda.get_current_context_func ();
71
72      if (profiling_p)
73	{
74	  thr->prof_info = NULL;
75	  thr->api_info = NULL;
76	}
77    }
78
79  return ret;
80}
81
82void *
83acc_get_cuda_stream (int async)
84{
85  struct goacc_thread *thr = goacc_thread ();
86
87  if (!async_valid_p (async))
88    return NULL;
89
90  void *ret = NULL;
91  if (thr && thr->dev && thr->dev->openacc.cuda.get_stream_func)
92    {
93      goacc_aq aq = lookup_goacc_asyncqueue (thr, false, async);
94      if (!aq)
95	return ret;
96
97      acc_prof_info prof_info;
98      acc_api_info api_info;
99      bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
100      if (profiling_p)
101	{
102	  prof_info.async = async;
103	  prof_info.async_queue = prof_info.async;
104	}
105
106      ret = thr->dev->openacc.cuda.get_stream_func (aq);
107
108      if (profiling_p)
109	{
110	  thr->prof_info = NULL;
111	  thr->api_info = NULL;
112	}
113    }
114
115  return ret;
116}
117
118int
119acc_set_cuda_stream (int async, void *stream)
120{
121  struct goacc_thread *thr;
122
123  if (!async_valid_p (async) || stream == NULL)
124    return 0;
125
126  goacc_lazy_initialize ();
127
128  thr = goacc_thread ();
129
130  int ret = -1;
131  if (thr && thr->dev && thr->dev->openacc.cuda.set_stream_func)
132    {
133      acc_prof_info prof_info;
134      acc_api_info api_info;
135      bool profiling_p = GOACC_PROFILING_SETUP_P (thr, &prof_info, &api_info);
136      if (profiling_p)
137	{
138	  prof_info.async = async;
139	  prof_info.async_queue = prof_info.async;
140	}
141
142      goacc_aq aq = get_goacc_asyncqueue (async);
143      /* Due to not using an asyncqueue for "acc_async_sync", this cannot be
144	 used to change the CUDA stream associated with "acc_async_sync".  */
145      if (!aq)
146	{
147	  assert (async == acc_async_sync);
148	  gomp_debug (0, "Refusing request to set CUDA stream associated"
149		      " with \"acc_async_sync\"\n");
150	  ret = 0;
151	  goto out_prof;
152	}
153      gomp_mutex_lock (&thr->dev->openacc.async.lock);
154      ret = thr->dev->openacc.cuda.set_stream_func (aq, stream);
155      gomp_mutex_unlock (&thr->dev->openacc.async.lock);
156
157    out_prof:
158      if (profiling_p)
159	{
160	  thr->prof_info = NULL;
161	  thr->api_info = NULL;
162	}
163    }
164
165  return ret;
166}
167