699 lines
17 KiB
C
699 lines
17 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 "libgomp.h"
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#include "oacc-int.h"
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#include "openacc.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <stdbool.h>
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#include <string.h>
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/* This lock is used to protect access to cached_base_dev, dispatchers and
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the (abstract) initialisation state of attached offloading devices. */
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static gomp_mutex_t acc_device_lock;
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/* A cached version of the dispatcher for the global "current" accelerator type,
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e.g. used as the default when creating new host threads. This is the
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device-type equivalent of goacc_device_num (which specifies which device to
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use out of potentially several of the same type). If there are several
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devices of a given type, this points at the first one. */
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static struct gomp_device_descr *cached_base_dev = NULL;
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#if defined HAVE_TLS || defined USE_EMUTLS
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__thread struct goacc_thread *goacc_tls_data;
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#else
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pthread_key_t goacc_tls_key;
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#endif
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static pthread_key_t goacc_cleanup_key;
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static struct goacc_thread *goacc_threads;
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static gomp_mutex_t goacc_thread_lock;
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/* An array of dispatchers for device types, indexed by the type. This array
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only references "base" devices, and other instances of the same type are
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found by simply indexing from each such device (which are stored linearly,
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grouped by device in target.c:devices). */
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static struct gomp_device_descr *dispatchers[_ACC_device_hwm] = { 0 };
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attribute_hidden void
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goacc_register (struct gomp_device_descr *disp)
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{
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/* Only register the 0th device here. */
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if (disp->target_id != 0)
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return;
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gomp_mutex_lock (&acc_device_lock);
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assert (acc_device_type (disp->type) != acc_device_none
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&& acc_device_type (disp->type) != acc_device_default
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&& acc_device_type (disp->type) != acc_device_not_host);
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assert (!dispatchers[disp->type]);
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dispatchers[disp->type] = disp;
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gomp_mutex_unlock (&acc_device_lock);
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}
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/* OpenACC names some things a little differently. */
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static const char *
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get_openacc_name (const char *name)
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{
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if (strcmp (name, "nvptx") == 0)
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return "nvidia";
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else
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return name;
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}
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static const char *
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name_of_acc_device_t (enum acc_device_t type)
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{
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switch (type)
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{
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case acc_device_none: return "none";
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case acc_device_default: return "default";
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case acc_device_host: return "host";
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case acc_device_not_host: return "not_host";
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case acc_device_nvidia: return "nvidia";
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default: gomp_fatal ("unknown device type %u", (unsigned) type);
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}
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}
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/* ACC_DEVICE_LOCK must be held before calling this function. If FAIL_IS_ERROR
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is true, this function raises an error if there are no devices of type D,
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otherwise it returns NULL in that case. */
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static struct gomp_device_descr *
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resolve_device (acc_device_t d, bool fail_is_error)
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{
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acc_device_t d_arg = d;
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switch (d)
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{
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case acc_device_default:
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{
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if (goacc_device_type)
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{
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/* Lookup the named device. */
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while (++d != _ACC_device_hwm)
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if (dispatchers[d]
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&& !strcasecmp (goacc_device_type,
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get_openacc_name (dispatchers[d]->name))
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&& dispatchers[d]->get_num_devices_func () > 0)
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goto found;
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if (fail_is_error)
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{
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gomp_mutex_unlock (&acc_device_lock);
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gomp_fatal ("device type %s not supported", goacc_device_type);
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}
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else
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return NULL;
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}
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/* No default device specified, so start scanning for any non-host
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device that is available. */
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d = acc_device_not_host;
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}
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/* FALLTHROUGH */
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case acc_device_not_host:
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/* Find the first available device after acc_device_not_host. */
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while (++d != _ACC_device_hwm)
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if (dispatchers[d] && dispatchers[d]->get_num_devices_func () > 0)
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goto found;
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if (d_arg == acc_device_default)
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{
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d = acc_device_host;
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goto found;
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}
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if (fail_is_error)
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{
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gomp_mutex_unlock (&acc_device_lock);
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gomp_fatal ("no device found");
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}
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else
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return NULL;
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break;
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case acc_device_host:
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break;
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default:
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if (d > _ACC_device_hwm)
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{
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if (fail_is_error)
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goto unsupported_device;
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else
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return NULL;
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}
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break;
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}
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found:
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assert (d != acc_device_none
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&& d != acc_device_default
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&& d != acc_device_not_host);
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if (dispatchers[d] == NULL && fail_is_error)
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{
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unsupported_device:
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gomp_mutex_unlock (&acc_device_lock);
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gomp_fatal ("device type %s not supported", name_of_acc_device_t (d));
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}
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return dispatchers[d];
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}
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/* Emit a suitable error if no device of a particular type is available, or
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the given device number is out-of-range. */
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static void
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acc_dev_num_out_of_range (acc_device_t d, int ord, int ndevs)
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{
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if (ndevs == 0)
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gomp_fatal ("no devices of type %s available", name_of_acc_device_t (d));
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else
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gomp_fatal ("device %u out of range", ord);
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}
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/* This is called when plugins have been initialized, and serves to call
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(indirectly) the target's device_init hook. Calling multiple times without
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an intervening acc_shutdown_1 call is an error. ACC_DEVICE_LOCK must be
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held before calling this function. */
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static struct gomp_device_descr *
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acc_init_1 (acc_device_t d)
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{
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struct gomp_device_descr *base_dev, *acc_dev;
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int ndevs;
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base_dev = resolve_device (d, true);
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ndevs = base_dev->get_num_devices_func ();
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if (ndevs <= 0 || goacc_device_num >= ndevs)
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acc_dev_num_out_of_range (d, goacc_device_num, ndevs);
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acc_dev = &base_dev[goacc_device_num];
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gomp_mutex_lock (&acc_dev->lock);
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if (acc_dev->state == GOMP_DEVICE_INITIALIZED)
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{
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_fatal ("device already active");
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}
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gomp_init_device (acc_dev);
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gomp_mutex_unlock (&acc_dev->lock);
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return base_dev;
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}
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/* ACC_DEVICE_LOCK must be held before calling this function. */
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static void
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acc_shutdown_1 (acc_device_t d)
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{
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struct gomp_device_descr *base_dev;
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struct goacc_thread *walk;
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int ndevs, i;
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bool devices_active = false;
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/* Get the base device for this device type. */
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base_dev = resolve_device (d, true);
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ndevs = base_dev->get_num_devices_func ();
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/* Unload all the devices of this type that have been opened. */
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for (i = 0; i < ndevs; i++)
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{
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struct gomp_device_descr *acc_dev = &base_dev[i];
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gomp_mutex_lock (&acc_dev->lock);
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gomp_unload_device (acc_dev);
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gomp_mutex_unlock (&acc_dev->lock);
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}
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gomp_mutex_lock (&goacc_thread_lock);
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/* Free target-specific TLS data and close all devices. */
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for (walk = goacc_threads; walk != NULL; walk = walk->next)
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{
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if (walk->target_tls)
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base_dev->openacc.destroy_thread_data_func (walk->target_tls);
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walk->target_tls = NULL;
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/* This would mean the user is shutting down OpenACC in the middle of an
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"acc data" pragma. Likely not intentional. */
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if (walk->mapped_data)
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{
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gomp_mutex_unlock (&goacc_thread_lock);
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gomp_fatal ("shutdown in 'acc data' region");
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}
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/* Similarly, if this happens then user code has done something weird. */
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if (walk->saved_bound_dev)
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{
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gomp_mutex_unlock (&goacc_thread_lock);
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gomp_fatal ("shutdown during host fallback");
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}
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if (walk->dev)
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{
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gomp_mutex_lock (&walk->dev->lock);
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gomp_free_memmap (&walk->dev->mem_map);
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gomp_mutex_unlock (&walk->dev->lock);
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walk->dev = NULL;
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walk->base_dev = NULL;
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}
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}
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gomp_mutex_unlock (&goacc_thread_lock);
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/* Close all the devices of this type that have been opened. */
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bool ret = true;
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for (i = 0; i < ndevs; i++)
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{
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struct gomp_device_descr *acc_dev = &base_dev[i];
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gomp_mutex_lock (&acc_dev->lock);
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if (acc_dev->state == GOMP_DEVICE_INITIALIZED)
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{
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devices_active = true;
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ret &= acc_dev->fini_device_func (acc_dev->target_id);
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acc_dev->state = GOMP_DEVICE_UNINITIALIZED;
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}
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gomp_mutex_unlock (&acc_dev->lock);
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}
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if (!ret)
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gomp_fatal ("device finalization failed");
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if (!devices_active)
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gomp_fatal ("no device initialized");
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}
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static struct goacc_thread *
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goacc_new_thread (void)
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{
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struct goacc_thread *thr = gomp_malloc (sizeof (struct gomp_thread));
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#if defined HAVE_TLS || defined USE_EMUTLS
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goacc_tls_data = thr;
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#else
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pthread_setspecific (goacc_tls_key, thr);
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#endif
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pthread_setspecific (goacc_cleanup_key, thr);
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gomp_mutex_lock (&goacc_thread_lock);
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thr->next = goacc_threads;
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goacc_threads = thr;
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gomp_mutex_unlock (&goacc_thread_lock);
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return thr;
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}
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static void
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goacc_destroy_thread (void *data)
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{
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struct goacc_thread *thr = data, *walk, *prev;
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gomp_mutex_lock (&goacc_thread_lock);
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if (thr)
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{
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struct gomp_device_descr *acc_dev = thr->dev;
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if (acc_dev && thr->target_tls)
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{
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acc_dev->openacc.destroy_thread_data_func (thr->target_tls);
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thr->target_tls = NULL;
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}
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assert (!thr->mapped_data);
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/* Remove from thread list. */
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for (prev = NULL, walk = goacc_threads; walk;
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prev = walk, walk = walk->next)
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if (walk == thr)
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{
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if (prev == NULL)
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goacc_threads = walk->next;
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else
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prev->next = walk->next;
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free (thr);
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break;
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}
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assert (walk);
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}
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gomp_mutex_unlock (&goacc_thread_lock);
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}
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/* Use the ORD'th device instance for the current host thread (or -1 for the
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current global default). The device (and the runtime) must be initialised
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before calling this function. */
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void
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goacc_attach_host_thread_to_device (int ord)
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{
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struct goacc_thread *thr = goacc_thread ();
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struct gomp_device_descr *acc_dev = NULL, *base_dev = NULL;
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int num_devices;
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if (thr && thr->dev && (thr->dev->target_id == ord || ord < 0))
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return;
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if (ord < 0)
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ord = goacc_device_num;
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/* Decide which type of device to use. If the current thread has a device
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type already (e.g. set by acc_set_device_type), use that, else use the
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global default. */
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if (thr && thr->base_dev)
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base_dev = thr->base_dev;
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else
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{
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assert (cached_base_dev);
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base_dev = cached_base_dev;
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}
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num_devices = base_dev->get_num_devices_func ();
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if (num_devices <= 0 || ord >= num_devices)
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acc_dev_num_out_of_range (acc_device_type (base_dev->type), ord,
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num_devices);
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if (!thr)
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thr = goacc_new_thread ();
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thr->base_dev = base_dev;
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thr->dev = acc_dev = &base_dev[ord];
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thr->saved_bound_dev = NULL;
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thr->mapped_data = NULL;
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thr->target_tls
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= acc_dev->openacc.create_thread_data_func (ord);
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acc_dev->openacc.async_set_async_func (acc_async_sync);
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}
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/* OpenACC 2.0a (3.2.12, 3.2.13) doesn't specify whether the serialization of
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init/shutdown is per-process or per-thread. We choose per-process. */
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void
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acc_init (acc_device_t d)
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{
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gomp_init_targets_once ();
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gomp_mutex_lock (&acc_device_lock);
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cached_base_dev = acc_init_1 (d);
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gomp_mutex_unlock (&acc_device_lock);
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goacc_attach_host_thread_to_device (-1);
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}
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ialias (acc_init)
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void
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acc_shutdown (acc_device_t d)
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{
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gomp_init_targets_once ();
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gomp_mutex_lock (&acc_device_lock);
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acc_shutdown_1 (d);
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gomp_mutex_unlock (&acc_device_lock);
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}
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ialias (acc_shutdown)
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int
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acc_get_num_devices (acc_device_t d)
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{
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int n = 0;
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struct gomp_device_descr *acc_dev;
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if (d == acc_device_none)
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return 0;
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gomp_init_targets_once ();
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gomp_mutex_lock (&acc_device_lock);
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acc_dev = resolve_device (d, false);
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gomp_mutex_unlock (&acc_device_lock);
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if (!acc_dev)
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return 0;
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n = acc_dev->get_num_devices_func ();
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if (n < 0)
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n = 0;
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return n;
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}
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ialias (acc_get_num_devices)
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/* Set the device type for the current thread only (using the current global
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default device number), initialising that device if necessary. Also set the
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default device type for new threads to D. */
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void
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acc_set_device_type (acc_device_t d)
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{
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struct gomp_device_descr *base_dev, *acc_dev;
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struct goacc_thread *thr = goacc_thread ();
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gomp_init_targets_once ();
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gomp_mutex_lock (&acc_device_lock);
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cached_base_dev = base_dev = resolve_device (d, true);
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acc_dev = &base_dev[goacc_device_num];
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gomp_mutex_lock (&acc_dev->lock);
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if (acc_dev->state == GOMP_DEVICE_UNINITIALIZED)
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gomp_init_device (acc_dev);
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gomp_mutex_unlock (&acc_dev->lock);
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gomp_mutex_unlock (&acc_device_lock);
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/* We're changing device type: invalidate the current thread's dev and
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base_dev pointers. */
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if (thr && thr->base_dev != base_dev)
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{
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thr->base_dev = thr->dev = NULL;
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if (thr->mapped_data)
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gomp_fatal ("acc_set_device_type in 'acc data' region");
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}
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goacc_attach_host_thread_to_device (-1);
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}
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ialias (acc_set_device_type)
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acc_device_t
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acc_get_device_type (void)
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{
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acc_device_t res = acc_device_none;
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struct gomp_device_descr *dev;
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struct goacc_thread *thr = goacc_thread ();
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if (thr && thr->base_dev)
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res = acc_device_type (thr->base_dev->type);
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else
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{
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gomp_init_targets_once ();
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gomp_mutex_lock (&acc_device_lock);
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dev = resolve_device (acc_device_default, true);
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gomp_mutex_unlock (&acc_device_lock);
|
|
res = acc_device_type (dev->type);
|
|
}
|
|
|
|
assert (res != acc_device_default
|
|
&& res != acc_device_not_host);
|
|
|
|
return res;
|
|
}
|
|
|
|
ialias (acc_get_device_type)
|
|
|
|
int
|
|
acc_get_device_num (acc_device_t d)
|
|
{
|
|
const struct gomp_device_descr *dev;
|
|
struct goacc_thread *thr = goacc_thread ();
|
|
|
|
if (d >= _ACC_device_hwm)
|
|
gomp_fatal ("unknown device type %u", (unsigned) d);
|
|
|
|
gomp_init_targets_once ();
|
|
|
|
gomp_mutex_lock (&acc_device_lock);
|
|
dev = resolve_device (d, true);
|
|
gomp_mutex_unlock (&acc_device_lock);
|
|
|
|
if (thr && thr->base_dev == dev && thr->dev)
|
|
return thr->dev->target_id;
|
|
|
|
return goacc_device_num;
|
|
}
|
|
|
|
ialias (acc_get_device_num)
|
|
|
|
void
|
|
acc_set_device_num (int ord, acc_device_t d)
|
|
{
|
|
struct gomp_device_descr *base_dev, *acc_dev;
|
|
int num_devices;
|
|
|
|
gomp_init_targets_once ();
|
|
|
|
if (ord < 0)
|
|
ord = goacc_device_num;
|
|
|
|
if ((int) d == 0)
|
|
/* Set whatever device is being used by the current host thread to use
|
|
device instance ORD. It's unclear if this is supposed to affect other
|
|
host threads too (OpenACC 2.0 (3.2.4) acc_set_device_num). */
|
|
goacc_attach_host_thread_to_device (ord);
|
|
else
|
|
{
|
|
gomp_mutex_lock (&acc_device_lock);
|
|
|
|
cached_base_dev = base_dev = resolve_device (d, true);
|
|
|
|
num_devices = base_dev->get_num_devices_func ();
|
|
|
|
if (num_devices <= 0 || ord >= num_devices)
|
|
acc_dev_num_out_of_range (d, ord, num_devices);
|
|
|
|
acc_dev = &base_dev[ord];
|
|
|
|
gomp_mutex_lock (&acc_dev->lock);
|
|
if (acc_dev->state == GOMP_DEVICE_UNINITIALIZED)
|
|
gomp_init_device (acc_dev);
|
|
gomp_mutex_unlock (&acc_dev->lock);
|
|
|
|
gomp_mutex_unlock (&acc_device_lock);
|
|
|
|
goacc_attach_host_thread_to_device (ord);
|
|
}
|
|
|
|
goacc_device_num = ord;
|
|
}
|
|
|
|
ialias (acc_set_device_num)
|
|
|
|
/* For -O and higher, the compiler always attempts to expand acc_on_device, but
|
|
if the user disables the builtin, or calls it via a pointer, we'll need this
|
|
version.
|
|
|
|
Compile this with optimization, so that the compiler expands
|
|
this, rather than generating infinitely recursive code. */
|
|
|
|
int __attribute__ ((__optimize__ ("O2")))
|
|
acc_on_device (acc_device_t dev)
|
|
{
|
|
return __builtin_acc_on_device (dev);
|
|
}
|
|
|
|
ialias (acc_on_device)
|
|
|
|
attribute_hidden void
|
|
goacc_runtime_initialize (void)
|
|
{
|
|
gomp_mutex_init (&acc_device_lock);
|
|
|
|
#if !(defined HAVE_TLS || defined USE_EMUTLS)
|
|
pthread_key_create (&goacc_tls_key, NULL);
|
|
#endif
|
|
|
|
pthread_key_create (&goacc_cleanup_key, goacc_destroy_thread);
|
|
|
|
cached_base_dev = NULL;
|
|
|
|
goacc_threads = NULL;
|
|
gomp_mutex_init (&goacc_thread_lock);
|
|
|
|
/* Initialize and register the 'host' device type. */
|
|
goacc_host_init ();
|
|
}
|
|
|
|
/* Compiler helper functions */
|
|
|
|
attribute_hidden void
|
|
goacc_save_and_set_bind (acc_device_t d)
|
|
{
|
|
struct goacc_thread *thr = goacc_thread ();
|
|
|
|
assert (!thr->saved_bound_dev);
|
|
|
|
thr->saved_bound_dev = thr->dev;
|
|
thr->dev = dispatchers[d];
|
|
}
|
|
|
|
attribute_hidden void
|
|
goacc_restore_bind (void)
|
|
{
|
|
struct goacc_thread *thr = goacc_thread ();
|
|
|
|
thr->dev = thr->saved_bound_dev;
|
|
thr->saved_bound_dev = NULL;
|
|
}
|
|
|
|
/* This is called from any OpenACC support function that may need to implicitly
|
|
initialize the libgomp runtime, either globally or from a new host thread.
|
|
On exit "goacc_thread" will return a valid & populated thread block. */
|
|
|
|
attribute_hidden void
|
|
goacc_lazy_initialize (void)
|
|
{
|
|
struct goacc_thread *thr = goacc_thread ();
|
|
|
|
if (thr && thr->dev)
|
|
return;
|
|
|
|
if (!cached_base_dev)
|
|
acc_init (acc_device_default);
|
|
else
|
|
goacc_attach_host_thread_to_device (-1);
|
|
}
|