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671 lines
15 KiB
C
671 lines
15 KiB
C
/* OpenACC Runtime initialization routines
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Copyright (C) 2013-2016 Free Software Foundation, Inc.
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Contributed by Mentor Embedded.
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "openacc.h"
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#include "config.h"
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#include "libgomp.h"
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#include "gomp-constants.h"
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#include "oacc-int.h"
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#include <stdint.h>
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#include <assert.h>
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/* Return block containing [H->S), or NULL if not contained. The device lock
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for DEV must be locked on entry, and remains locked on exit. */
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static splay_tree_key
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lookup_host (struct gomp_device_descr *dev, void *h, size_t s)
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{
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struct splay_tree_key_s node;
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splay_tree_key key;
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node.host_start = (uintptr_t) h;
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node.host_end = (uintptr_t) h + s;
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key = splay_tree_lookup (&dev->mem_map, &node);
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return key;
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}
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/* Return block containing [D->S), or NULL if not contained.
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The list isn't ordered by device address, so we have to iterate
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over the whole array. This is not expected to be a common
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operation. The device lock associated with TGT must be locked on entry, and
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remains locked on exit. */
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static splay_tree_key
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lookup_dev (struct target_mem_desc *tgt, void *d, size_t s)
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{
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int i;
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struct target_mem_desc *t;
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if (!tgt)
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return NULL;
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for (t = tgt; t != NULL; t = t->prev)
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{
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if (t->tgt_start <= (uintptr_t) d && t->tgt_end >= (uintptr_t) d + s)
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break;
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}
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if (!t)
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return NULL;
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for (i = 0; i < t->list_count; i++)
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{
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void * offset;
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splay_tree_key k = &t->array[i].key;
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offset = d - t->tgt_start + k->tgt_offset;
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if (k->host_start + offset <= (void *) k->host_end)
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return k;
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}
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return NULL;
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}
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/* OpenACC is silent on how memory exhaustion is indicated. We return
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NULL. */
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void *
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acc_malloc (size_t s)
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{
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if (!s)
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return NULL;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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assert (thr->dev);
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return thr->dev->alloc_func (thr->dev->target_id, s);
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}
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/* OpenACC 2.0a (3.2.16) doesn't specify what to do in the event
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the device address is mapped. We choose to check if it mapped,
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and if it is, to unmap it. */
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void
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acc_free (void *d)
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{
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splay_tree_key k;
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if (!d)
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return;
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struct goacc_thread *thr = goacc_thread ();
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assert (thr && thr->dev);
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struct gomp_device_descr *acc_dev = thr->dev;
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gomp_mutex_lock (&acc_dev->lock);
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/* We don't have to call lazy open here, as the ptr value must have
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been returned by acc_malloc. It's not permitted to pass NULL in
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(unless you got that null from acc_malloc). */
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if ((k = lookup_dev (acc_dev->openacc.data_environ, d, 1)))
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{
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void *offset;
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offset = d - k->tgt->tgt_start + k->tgt_offset;
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gomp_mutex_unlock (&acc_dev->lock);
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acc_unmap_data ((void *)(k->host_start + offset));
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}
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else
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gomp_mutex_unlock (&acc_dev->lock);
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acc_dev->free_func (acc_dev->target_id, d);
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}
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void
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acc_memcpy_to_device (void *d, void *h, size_t s)
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{
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/* No need to call lazy open here, as the device pointer must have
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been obtained from a routine that did that. */
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struct goacc_thread *thr = goacc_thread ();
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assert (thr && thr->dev);
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thr->dev->host2dev_func (thr->dev->target_id, d, h, s);
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}
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void
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acc_memcpy_from_device (void *h, void *d, size_t s)
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{
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/* No need to call lazy open here, as the device pointer must have
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been obtained from a routine that did that. */
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struct goacc_thread *thr = goacc_thread ();
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assert (thr && thr->dev);
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thr->dev->dev2host_func (thr->dev->target_id, h, d, s);
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}
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/* Return the device pointer that corresponds to host data H. Or NULL
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if no mapping. */
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void *
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acc_deviceptr (void *h)
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{
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splay_tree_key n;
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void *d;
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void *offset;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *dev = thr->dev;
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gomp_mutex_lock (&dev->lock);
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n = lookup_host (dev, h, 1);
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if (!n)
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{
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gomp_mutex_unlock (&dev->lock);
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return NULL;
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}
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offset = h - n->host_start;
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d = n->tgt->tgt_start + n->tgt_offset + offset;
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gomp_mutex_unlock (&dev->lock);
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return d;
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}
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/* Return the host pointer that corresponds to device data D. Or NULL
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if no mapping. */
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void *
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acc_hostptr (void *d)
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{
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splay_tree_key n;
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void *h;
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void *offset;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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gomp_mutex_lock (&acc_dev->lock);
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n = lookup_dev (acc_dev->openacc.data_environ, d, 1);
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if (!n)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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return NULL;
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}
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offset = d - n->tgt->tgt_start + n->tgt_offset;
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h = n->host_start + offset;
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gomp_mutex_unlock (&acc_dev->lock);
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return h;
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}
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/* Return 1 if host data [H,+S] is present on the device. */
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int
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acc_is_present (void *h, size_t s)
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{
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splay_tree_key n;
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if (!s || !h)
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return 0;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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gomp_mutex_lock (&acc_dev->lock);
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n = lookup_host (acc_dev, h, s);
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if (n && ((uintptr_t)h < n->host_start
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|| (uintptr_t)h + s > n->host_end
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|| s > n->host_end - n->host_start))
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n = NULL;
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gomp_mutex_unlock (&acc_dev->lock);
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return n != NULL;
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}
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/* Create a mapping for host [H,+S] -> device [D,+S] */
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void
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acc_map_data (void *h, void *d, size_t s)
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{
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struct target_mem_desc *tgt;
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size_t mapnum = 1;
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void *hostaddrs = h;
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void *devaddrs = d;
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size_t sizes = s;
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unsigned short kinds = GOMP_MAP_ALLOC;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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if (acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
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{
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if (d != h)
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gomp_fatal ("cannot map data on shared-memory system");
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tgt = gomp_map_vars (NULL, 0, NULL, NULL, NULL, NULL, true,
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GOMP_MAP_VARS_OPENACC);
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}
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else
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{
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struct goacc_thread *thr = goacc_thread ();
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if (!d || !h || !s)
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gomp_fatal ("[%p,+%d]->[%p,+%d] is a bad map",
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(void *)h, (int)s, (void *)d, (int)s);
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gomp_mutex_lock (&acc_dev->lock);
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if (lookup_host (acc_dev, h, s))
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("host address [%p, +%d] is already mapped", (void *)h,
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(int)s);
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}
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if (lookup_dev (thr->dev->openacc.data_environ, d, s))
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("device address [%p, +%d] is already mapped", (void *)d,
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(int)s);
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}
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gomp_mutex_unlock (&acc_dev->lock);
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tgt = gomp_map_vars (acc_dev, mapnum, &hostaddrs, &devaddrs, &sizes,
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&kinds, true, GOMP_MAP_VARS_OPENACC);
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}
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gomp_mutex_lock (&acc_dev->lock);
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tgt->prev = acc_dev->openacc.data_environ;
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acc_dev->openacc.data_environ = tgt;
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gomp_mutex_unlock (&acc_dev->lock);
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}
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void
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acc_unmap_data (void *h)
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{
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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/* No need to call lazy open, as the address must have been mapped. */
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size_t host_size;
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gomp_mutex_lock (&acc_dev->lock);
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splay_tree_key n = lookup_host (acc_dev, h, 1);
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struct target_mem_desc *t;
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if (!n)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("%p is not a mapped block", (void *)h);
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}
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host_size = n->host_end - n->host_start;
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if (n->host_start != (uintptr_t) h)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,%d] surrounds %p",
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(void *) n->host_start, (int) host_size, (void *) h);
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}
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t = n->tgt;
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if (t->refcount == 2)
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{
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struct target_mem_desc *tp;
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/* This is the last reference, so pull the descriptor off the
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chain. This avoids gomp_unmap_vars via gomp_unmap_tgt from
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freeing the device memory. */
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t->tgt_end = 0;
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t->to_free = 0;
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for (tp = NULL, t = acc_dev->openacc.data_environ; t != NULL;
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tp = t, t = t->prev)
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if (n->tgt == t)
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{
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if (tp)
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tp->prev = t->prev;
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else
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acc_dev->openacc.data_environ = t->prev;
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break;
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}
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}
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_unmap_vars (t, true);
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}
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#define FLAG_PRESENT (1 << 0)
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#define FLAG_CREATE (1 << 1)
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#define FLAG_COPY (1 << 2)
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static void *
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present_create_copy (unsigned f, void *h, size_t s)
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{
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void *d;
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splay_tree_key n;
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if (!h || !s)
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gomp_fatal ("[%p,+%d] is a bad range", (void *)h, (int)s);
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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gomp_mutex_lock (&acc_dev->lock);
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n = lookup_host (acc_dev, h, s);
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if (n)
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{
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/* Present. */
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d = (void *) (n->tgt->tgt_start + n->tgt_offset);
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if (!(f & FLAG_PRESENT))
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,+%d] already mapped to [%p,+%d]",
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(void *)h, (int)s, (void *)d, (int)s);
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}
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if ((h + s) > (void *)n->host_end)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,+%d] not mapped", (void *)h, (int)s);
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}
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gomp_mutex_unlock (&acc_dev->lock);
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}
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else if (!(f & FLAG_CREATE))
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,+%d] not mapped", (void *)h, (int)s);
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}
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else
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{
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struct target_mem_desc *tgt;
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size_t mapnum = 1;
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unsigned short kinds;
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void *hostaddrs = h;
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if (f & FLAG_COPY)
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kinds = GOMP_MAP_TO;
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else
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kinds = GOMP_MAP_ALLOC;
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gomp_mutex_unlock (&acc_dev->lock);
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tgt = gomp_map_vars (acc_dev, mapnum, &hostaddrs, NULL, &s, &kinds, true,
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GOMP_MAP_VARS_OPENACC);
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gomp_mutex_lock (&acc_dev->lock);
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d = tgt->to_free;
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tgt->prev = acc_dev->openacc.data_environ;
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acc_dev->openacc.data_environ = tgt;
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gomp_mutex_unlock (&acc_dev->lock);
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}
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return d;
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}
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void *
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acc_create (void *h, size_t s)
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{
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return present_create_copy (FLAG_CREATE, h, s);
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}
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void *
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acc_copyin (void *h, size_t s)
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{
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return present_create_copy (FLAG_CREATE | FLAG_COPY, h, s);
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}
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void *
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acc_present_or_create (void *h, size_t s)
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{
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return present_create_copy (FLAG_PRESENT | FLAG_CREATE, h, s);
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}
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void *
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acc_present_or_copyin (void *h, size_t s)
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{
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return present_create_copy (FLAG_PRESENT | FLAG_CREATE | FLAG_COPY, h, s);
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}
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#define FLAG_COPYOUT (1 << 0)
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static void
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delete_copyout (unsigned f, void *h, size_t s)
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{
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size_t host_size;
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splay_tree_key n;
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void *d;
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = thr->dev;
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gomp_mutex_lock (&acc_dev->lock);
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n = lookup_host (acc_dev, h, s);
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/* No need to call lazy open, as the data must already have been
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mapped. */
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if (!n)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,%d] is not mapped", (void *)h, (int)s);
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}
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d = (void *) (n->tgt->tgt_start + n->tgt_offset
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+ (uintptr_t) h - n->host_start);
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host_size = n->host_end - n->host_start;
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if (n->host_start != (uintptr_t) h || host_size != s)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("[%p,%d] surrounds2 [%p,+%d]",
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(void *) n->host_start, (int) host_size, (void *) h, (int) s);
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}
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gomp_mutex_unlock (&acc_dev->lock);
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if (f & FLAG_COPYOUT)
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acc_dev->dev2host_func (acc_dev->target_id, h, d, s);
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acc_unmap_data (h);
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acc_dev->free_func (acc_dev->target_id, d);
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}
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void
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acc_delete (void *h , size_t s)
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{
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delete_copyout (0, h, s);
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}
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void acc_copyout (void *h, size_t s)
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{
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delete_copyout (FLAG_COPYOUT, h, s);
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}
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static void
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update_dev_host (int is_dev, void *h, size_t s)
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{
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splay_tree_key n;
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void *d;
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goacc_lazy_initialize ();
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struct goacc_thread *thr = goacc_thread ();
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|
struct gomp_device_descr *acc_dev = thr->dev;
|
|
|
|
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__);
|
|
}
|