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/* Copyright (C) 2013-2022 Free Software Foundation, Inc.
Contributed by Jakub Jelinek <jakub@redhat.com>.
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/>. */
#include "libgomp.h"
#include "libgomp-nvptx.h" /* For struct rev_offload + GOMP_REV_OFFLOAD_VAR. */
#include <limits.h>
extern int __gomp_team_num __attribute__((shared));
extern volatile struct gomp_offload_icvs GOMP_ADDITIONAL_ICVS;
volatile struct rev_offload *GOMP_REV_OFFLOAD_VAR;
bool
GOMP_teams4 (unsigned int num_teams_lower, unsigned int num_teams_upper,
unsigned int thread_limit, bool first)
{
unsigned int num_blocks, block_id;
asm ("mov.u32 %0, %%nctaid.x;" : "=r" (num_blocks));
if (!first)
{
unsigned int team_num;
if (num_blocks > gomp_num_teams_var)
return false;
team_num = __gomp_team_num;
if (team_num > gomp_num_teams_var - num_blocks)
return false;
__gomp_team_num = team_num + num_blocks;
return true;
}
if (thread_limit)
{
struct gomp_task_icv *icv = gomp_icv (true);
icv->thread_limit_var
= thread_limit > INT_MAX ? UINT_MAX : thread_limit;
}
if (!num_teams_upper)
num_teams_upper = num_blocks;
else if (num_blocks < num_teams_lower)
num_teams_upper = num_teams_lower;
else if (num_blocks < num_teams_upper)
num_teams_upper = num_blocks;
asm ("mov.u32 %0, %%ctaid.x;" : "=r" (block_id));
if (block_id >= num_teams_upper)
return false;
__gomp_team_num = block_id;
gomp_num_teams_var = num_teams_upper - 1;
return true;
}
int
omp_pause_resource (omp_pause_resource_t kind, int device_num)
{
(void) kind;
(void) device_num;
return -1;
}
int
omp_pause_resource_all (omp_pause_resource_t kind)
{
(void) kind;
return -1;
}
ialias (omp_pause_resource)
ialias (omp_pause_resource_all)
void
GOMP_target_ext (int device, void (*fn) (void *), size_t mapnum,
void **hostaddrs, size_t *sizes, unsigned short *kinds,
unsigned int flags, void **depend, void **args)
{
static int lock = 0; /* == gomp_mutex_t lock; gomp_mutex_init (&lock); */
(void) flags;
(void) depend;
(void) args;
if (device != GOMP_DEVICE_HOST_FALLBACK
|| fn == NULL
|| GOMP_REV_OFFLOAD_VAR == NULL)
return;
gomp_mutex_lock (&lock);
GOMP_REV_OFFLOAD_VAR->mapnum = mapnum;
GOMP_REV_OFFLOAD_VAR->addrs = (uint64_t) hostaddrs;
GOMP_REV_OFFLOAD_VAR->sizes = (uint64_t) sizes;
GOMP_REV_OFFLOAD_VAR->kinds = (uint64_t) kinds;
GOMP_REV_OFFLOAD_VAR->dev_num = GOMP_ADDITIONAL_ICVS.device_num;
/* Set 'fn' to trigger processing on the host; wait for completion,
which is flagged by setting 'fn' back to 0 on the host. */
uint64_t addr_struct_fn = (uint64_t) &GOMP_REV_OFFLOAD_VAR->fn;
#if __PTX_SM__ >= 700
asm volatile ("st.global.release.sys.u64 [%0], %1;"
: : "r"(addr_struct_fn), "r" (fn) : "memory");
#else
__sync_synchronize (); /* membar.sys */
asm volatile ("st.volatile.global.u64 [%0], %1;"
: : "r"(addr_struct_fn), "r" (fn) : "memory");
#endif
#if __PTX_SM__ >= 700
uint64_t fn2;
do
{
asm volatile ("ld.acquire.sys.global.u64 %0, [%1];"
: "=r" (fn2) : "r" (addr_struct_fn) : "memory");
}
while (fn2 != 0);
#else
/* ld.global.u64 %r64,[__gomp_rev_offload_var];
ld.u64 %r36,[%r64];
membar.sys; */
while (__atomic_load_n (&GOMP_REV_OFFLOAD_VAR->fn, __ATOMIC_ACQUIRE) != 0)
; /* spin */
#endif
gomp_mutex_unlock (&lock);
}
void
GOMP_target_data_ext (int device, size_t mapnum, void **hostaddrs,
size_t *sizes, unsigned short *kinds)
{
(void) device;
(void) mapnum;
(void) hostaddrs;
(void) sizes;
(void) kinds;
__builtin_unreachable ();
}
void
GOMP_target_end_data (void)
{
__builtin_unreachable ();
}
void
GOMP_target_update_ext (int device, size_t mapnum, void **hostaddrs,
size_t *sizes, unsigned short *kinds,
unsigned int flags, void **depend)
{
(void) device;
(void) mapnum;
(void) hostaddrs;
(void) sizes;
(void) kinds;
(void) flags;
(void) depend;
__builtin_unreachable ();
}
void
GOMP_target_enter_exit_data (int device, size_t mapnum, void **hostaddrs,
size_t *sizes, unsigned short *kinds,
unsigned int flags, void **depend)
{
(void) device;
(void) mapnum;
(void) hostaddrs;
(void) sizes;
(void) kinds;
(void) flags;
(void) depend;
__builtin_unreachable ();
}
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