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gcc/libgomp/oacc-parallel.c

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/* Copyright (C) 2013-2016 Free Software Foundation, Inc.
Contributed by Mentor Embedded.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* This file handles OpenACC constructs. */
#include "openacc.h"
#include "libgomp.h"
#include "libgomp_g.h"
#include "gomp-constants.h"
#include "oacc-int.h"
#ifdef HAVE_INTTYPES_H
# include <inttypes.h> /* For PRIu64. */
#endif
#include <string.h>
#include <stdarg.h>
#include <assert.h>
static int
find_pset (int pos, size_t mapnum, unsigned short *kinds)
{
if (pos + 1 >= mapnum)
return 0;
unsigned char kind = kinds[pos+1] & 0xff;
return kind == GOMP_MAP_TO_PSET;
}
static void goacc_wait (int async, int num_waits, va_list *ap);
/* Launch a possibly offloaded function on DEVICE. FN is the host fn
address. MAPNUM, HOSTADDRS, SIZES & KINDS describe the memory
blocks to be copied to/from the device. Varadic arguments are
keyed optional parameters terminated with a zero. */
void
GOACC_parallel_keyed (int device, void (*fn) (void *),
size_t mapnum, void **hostaddrs, size_t *sizes,
unsigned short *kinds, ...)
{
bool host_fallback = device == GOMP_DEVICE_HOST_FALLBACK;
va_list ap;
struct goacc_thread *thr;
struct gomp_device_descr *acc_dev;
struct target_mem_desc *tgt;
void **devaddrs;
unsigned int i;
struct splay_tree_key_s k;
splay_tree_key tgt_fn_key;
void (*tgt_fn);
int async = GOMP_ASYNC_SYNC;
unsigned dims[GOMP_DIM_MAX];
unsigned tag;
#ifdef HAVE_INTTYPES_H
gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
__FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
#else
gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
__FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
#endif
goacc_lazy_initialize ();
thr = goacc_thread ();
acc_dev = thr->dev;
/* Host fallback if "if" clause is false or if the current device is set to
the host. */
if (host_fallback)
{
goacc_save_and_set_bind (acc_device_host);
fn (hostaddrs);
goacc_restore_bind ();
return;
}
else if (acc_device_type (acc_dev->type) == acc_device_host)
{
fn (hostaddrs);
return;
}
/* Default: let the runtime choose. */
for (i = 0; i != GOMP_DIM_MAX; i++)
dims[i] = 0;
va_start (ap, kinds);
/* TODO: This will need amending when device_type is implemented. */
while ((tag = va_arg (ap, unsigned)) != 0)
{
if (GOMP_LAUNCH_DEVICE (tag))
gomp_fatal ("device_type '%d' offload parameters, libgomp is too old",
GOMP_LAUNCH_DEVICE (tag));
switch (GOMP_LAUNCH_CODE (tag))
{
case GOMP_LAUNCH_DIM:
{
unsigned mask = GOMP_LAUNCH_OP (tag);
for (i = 0; i != GOMP_DIM_MAX; i++)
if (mask & GOMP_DIM_MASK (i))
dims[i] = va_arg (ap, unsigned);
}
break;
case GOMP_LAUNCH_ASYNC:
{
/* Small constant values are encoded in the operand. */
async = GOMP_LAUNCH_OP (tag);
if (async == GOMP_LAUNCH_OP_MAX)
async = va_arg (ap, unsigned);
break;
}
case GOMP_LAUNCH_WAIT:
{
unsigned num_waits = GOMP_LAUNCH_OP (tag);
if (num_waits)
goacc_wait (async, num_waits, &ap);
break;
}
default:
gomp_fatal ("unrecognized offload code '%d',"
" libgomp is too old", GOMP_LAUNCH_CODE (tag));
}
}
va_end (ap);
acc_dev->openacc.async_set_async_func (async);
if (!(acc_dev->capabilities & GOMP_OFFLOAD_CAP_NATIVE_EXEC))
{
k.host_start = (uintptr_t) fn;
k.host_end = k.host_start + 1;
gomp_mutex_lock (&acc_dev->lock);
tgt_fn_key = splay_tree_lookup (&acc_dev->mem_map, &k);
gomp_mutex_unlock (&acc_dev->lock);
if (tgt_fn_key == NULL)
gomp_fatal ("target function wasn't mapped");
tgt_fn = (void (*)) tgt_fn_key->tgt_offset;
}
else
tgt_fn = (void (*)) fn;
tgt = gomp_map_vars (acc_dev, mapnum, hostaddrs, NULL, sizes, kinds, true,
GOMP_MAP_VARS_OPENACC);
devaddrs = gomp_alloca (sizeof (void *) * mapnum);
for (i = 0; i < mapnum; i++)
devaddrs[i] = (void *) (tgt->list[i].key->tgt->tgt_start
+ tgt->list[i].key->tgt_offset);
acc_dev->openacc.exec_func (tgt_fn, mapnum, hostaddrs, devaddrs,
async, dims, tgt);
/* If running synchronously, unmap immediately. */
if (async < acc_async_noval)
gomp_unmap_vars (tgt, true);
else
{
gomp_copy_from_async (tgt);
acc_dev->openacc.register_async_cleanup_func (tgt);
}
acc_dev->openacc.async_set_async_func (acc_async_sync);
}
/* Legacy entry point, only provide host execution. */
void
GOACC_parallel (int device, void (*fn) (void *),
size_t mapnum, void **hostaddrs, size_t *sizes,
unsigned short *kinds,
int num_gangs, int num_workers, int vector_length,
int async, int num_waits, ...)
{
goacc_save_and_set_bind (acc_device_host);
fn (hostaddrs);
goacc_restore_bind ();
}
void
GOACC_data_start (int device, size_t mapnum,
void **hostaddrs, size_t *sizes, unsigned short *kinds)
{
bool host_fallback = device == GOMP_DEVICE_HOST_FALLBACK;
struct target_mem_desc *tgt;
#ifdef HAVE_INTTYPES_H
gomp_debug (0, "%s: mapnum=%"PRIu64", hostaddrs=%p, size=%p, kinds=%p\n",
__FUNCTION__, (uint64_t) mapnum, hostaddrs, sizes, kinds);
#else
gomp_debug (0, "%s: mapnum=%lu, hostaddrs=%p, sizes=%p, kinds=%p\n",
__FUNCTION__, (unsigned long) mapnum, hostaddrs, sizes, kinds);
#endif
goacc_lazy_initialize ();
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
/* Host fallback or 'do nothing'. */
if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
|| host_fallback)
{
tgt = gomp_map_vars (NULL, 0, NULL, NULL, NULL, NULL, true,
GOMP_MAP_VARS_OPENACC);
tgt->prev = thr->mapped_data;
thr->mapped_data = tgt;
return;
}
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__);
tgt->prev = thr->mapped_data;
thr->mapped_data = tgt;
}
void
GOACC_data_end (void)
{
struct goacc_thread *thr = goacc_thread ();
struct target_mem_desc *tgt = thr->mapped_data;
gomp_debug (0, " %s: restore mappings\n", __FUNCTION__);
thr->mapped_data = tgt->prev;
gomp_unmap_vars (tgt, true);
gomp_debug (0, " %s: mappings restored\n", __FUNCTION__);
}
void
GOACC_enter_exit_data (int device, size_t mapnum,
void **hostaddrs, size_t *sizes, unsigned short *kinds,
int async, int num_waits, ...)
{
struct goacc_thread *thr;
struct gomp_device_descr *acc_dev;
bool host_fallback = device == GOMP_DEVICE_HOST_FALLBACK;
bool data_enter = false;
size_t i;
goacc_lazy_initialize ();
thr = goacc_thread ();
acc_dev = thr->dev;
if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
|| host_fallback)
return;
if (num_waits)
{
va_list ap;
va_start (ap, num_waits);
goacc_wait (async, num_waits, &ap);
va_end (ap);
}
acc_dev->openacc.async_set_async_func (async);
/* Determine if this is an "acc enter data". */
for (i = 0; i < mapnum; ++i)
{
unsigned char kind = kinds[i] & 0xff;
if (kind == GOMP_MAP_POINTER || kind == GOMP_MAP_TO_PSET)
continue;
if (kind == GOMP_MAP_FORCE_ALLOC
|| kind == GOMP_MAP_FORCE_PRESENT
|| kind == GOMP_MAP_FORCE_TO)
{
data_enter = true;
break;
}
if (kind == GOMP_MAP_DELETE
|| kind == GOMP_MAP_FORCE_FROM)
break;
gomp_fatal (">>>> GOACC_enter_exit_data UNHANDLED kind 0x%.2x",
kind);
}
if (data_enter)
{
for (i = 0; i < mapnum; i++)
{
unsigned char kind = kinds[i] & 0xff;
/* Scan for PSETs. */
int psets = find_pset (i, mapnum, kinds);
if (!psets)
{
switch (kind)
{
case GOMP_MAP_POINTER:
gomp_acc_insert_pointer (1, &hostaddrs[i], &sizes[i],
&kinds[i]);
break;
case GOMP_MAP_FORCE_ALLOC:
acc_create (hostaddrs[i], sizes[i]);
break;
case GOMP_MAP_FORCE_PRESENT:
acc_present_or_copyin (hostaddrs[i], sizes[i]);
break;
case GOMP_MAP_FORCE_TO:
acc_present_or_copyin (hostaddrs[i], sizes[i]);
break;
default:
gomp_fatal (">>>> GOACC_enter_exit_data UNHANDLED kind 0x%.2x",
kind);
break;
}
}
else
{
gomp_acc_insert_pointer (3, &hostaddrs[i], &sizes[i], &kinds[i]);
/* Increment 'i' by two because OpenACC requires fortran
arrays to be contiguous, so each PSET is associated with
one of MAP_FORCE_ALLOC/MAP_FORCE_PRESET/MAP_FORCE_TO, and
one MAP_POINTER. */
i += 2;
}
}
}
else
for (i = 0; i < mapnum; ++i)
{
unsigned char kind = kinds[i] & 0xff;
int psets = find_pset (i, mapnum, kinds);
if (!psets)
{
switch (kind)
{
case GOMP_MAP_POINTER:
gomp_acc_remove_pointer (hostaddrs[i], (kinds[i] & 0xff)
== GOMP_MAP_FORCE_FROM,
async, 1);
break;
case GOMP_MAP_DELETE:
acc_delete (hostaddrs[i], sizes[i]);
break;
case GOMP_MAP_FORCE_FROM:
acc_copyout (hostaddrs[i], sizes[i]);
break;
default:
gomp_fatal (">>>> GOACC_enter_exit_data UNHANDLED kind 0x%.2x",
kind);
break;
}
}
else
{
gomp_acc_remove_pointer (hostaddrs[i], (kinds[i] & 0xff)
== GOMP_MAP_FORCE_FROM, async, 3);
/* See the above comment. */
i += 2;
}
}
acc_dev->openacc.async_set_async_func (acc_async_sync);
}
static void
goacc_wait (int async, int num_waits, va_list *ap)
{
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
while (num_waits--)
{
int qid = va_arg (*ap, int);
if (acc_async_test (qid))
continue;
if (async == acc_async_sync)
acc_wait (qid);
else if (qid == async)
;/* If we're waiting on the same asynchronous queue as we're
launching on, the queue itself will order work as
required, so there's no need to wait explicitly. */
else
acc_dev->openacc.async_wait_async_func (qid, async);
}
}
void
GOACC_update (int device, size_t mapnum,
void **hostaddrs, size_t *sizes, unsigned short *kinds,
int async, int num_waits, ...)
{
bool host_fallback = device == GOMP_DEVICE_HOST_FALLBACK;
size_t i;
goacc_lazy_initialize ();
struct goacc_thread *thr = goacc_thread ();
struct gomp_device_descr *acc_dev = thr->dev;
if ((acc_dev->capabilities & GOMP_OFFLOAD_CAP_SHARED_MEM)
|| host_fallback)
return;
if (num_waits)
{
va_list ap;
va_start (ap, num_waits);
goacc_wait (async, num_waits, &ap);
va_end (ap);
}
acc_dev->openacc.async_set_async_func (async);
for (i = 0; i < mapnum; ++i)
{
unsigned char kind = kinds[i] & 0xff;
switch (kind)
{
case GOMP_MAP_POINTER:
case GOMP_MAP_TO_PSET:
break;
case GOMP_MAP_FORCE_TO:
acc_update_device (hostaddrs[i], sizes[i]);
break;
case GOMP_MAP_FORCE_FROM:
acc_update_self (hostaddrs[i], sizes[i]);
break;
default:
gomp_fatal (">>>> GOACC_update UNHANDLED kind 0x%.2x", kind);
break;
}
}
acc_dev->openacc.async_set_async_func (acc_async_sync);
}
void
GOACC_wait (int async, int num_waits, ...)
{
if (num_waits)
{
va_list ap;
va_start (ap, num_waits);
goacc_wait (async, num_waits, &ap);
va_end (ap);
}
else if (async == acc_async_sync)
acc_wait_all ();
else if (async == acc_async_noval)
goacc_thread ()->dev->openacc.async_wait_all_async_func (acc_async_noval);
}
int
GOACC_get_num_threads (void)
{
return 1;
}
int
GOACC_get_thread_num (void)
{
return 0;
}
void
GOACC_declare (int device, size_t mapnum,
void **hostaddrs, size_t *sizes, unsigned short *kinds)
{
int i;
for (i = 0; i < mapnum; i++)
{
unsigned char kind = kinds[i] & 0xff;
if (kind == GOMP_MAP_POINTER || kind == GOMP_MAP_TO_PSET)
continue;
switch (kind)
{
case GOMP_MAP_FORCE_ALLOC:
case GOMP_MAP_FORCE_FROM:
case GOMP_MAP_FORCE_TO:
case GOMP_MAP_POINTER:
case GOMP_MAP_DELETE:
GOACC_enter_exit_data (device, 1, &hostaddrs[i], &sizes[i],
&kinds[i], 0, 0);
break;
case GOMP_MAP_FORCE_DEVICEPTR:
break;
case GOMP_MAP_ALLOC:
if (!acc_is_present (hostaddrs[i], sizes[i]))
GOACC_enter_exit_data (device, 1, &hostaddrs[i], &sizes[i],
&kinds[i], 0, 0);
break;
case GOMP_MAP_TO:
GOACC_enter_exit_data (device, 1, &hostaddrs[i], &sizes[i],
&kinds[i], 0, 0);
break;
case GOMP_MAP_FROM:
kinds[i] = GOMP_MAP_FORCE_FROM;
GOACC_enter_exit_data (device, 1, &hostaddrs[i], &sizes[i],
&kinds[i], 0, 0);
break;
case GOMP_MAP_FORCE_PRESENT:
if (!acc_is_present (hostaddrs[i], sizes[i]))
gomp_fatal ("[%p,%ld] is not mapped", hostaddrs[i],
(unsigned long) sizes[i]);
break;
default:
assert (0);
break;
}
}
}
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