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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2011 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2014-2015 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "ompi/mca/osc/osc.h"
#include "ompi/mca/osc/base/base.h"
#include "ompi/mca/osc/base/osc_base_obj_convert.h"
#include "osc_sm.h"
static inline uint32_t
lk_fetch_add32(ompi_osc_sm_module_t *module,
int target,
size_t offset,
uint32_t delta)
{
/* opal_atomic_add_fetch_32 is an add then fetch so delta needs to be subtracted out to get the
* old value */
return opal_atomic_add_fetch_32((opal_atomic_int32_t *) ((char*) &module->node_states[target].lock + offset),
delta) - delta;
}
static inline void
lk_add32(ompi_osc_sm_module_t *module,
int target,
size_t offset,
uint32_t delta)
{
opal_atomic_add_fetch_32((opal_atomic_int32_t *) ((char*) &module->node_states[target].lock + offset),
delta);
}
static inline uint32_t
lk_fetch32(ompi_osc_sm_module_t *module,
int target,
size_t offset)
{
opal_atomic_mb ();
return *((uint32_t *)((char*) &module->node_states[target].lock + offset));
}
static inline int
start_exclusive(ompi_osc_sm_module_t *module,
int target)
{
uint32_t me = lk_fetch_add32(module, target,
offsetof(ompi_osc_sm_lock_t, counter), 1);
while (me != lk_fetch32(module, target,
offsetof(ompi_osc_sm_lock_t, write))) {
opal_progress();
}
return OMPI_SUCCESS;
}
static inline int
end_exclusive(ompi_osc_sm_module_t *module,
int target)
{
lk_add32(module, target, offsetof(ompi_osc_sm_lock_t, write), 1);
lk_add32(module, target, offsetof(ompi_osc_sm_lock_t, read), 1);
return OMPI_SUCCESS;
}
static inline int
start_shared(ompi_osc_sm_module_t *module,
int target)
{
uint32_t me = lk_fetch_add32(module, target,
offsetof(ompi_osc_sm_lock_t, counter), 1);
while (me != lk_fetch32(module, target,
offsetof(ompi_osc_sm_lock_t, read))) {
opal_progress();
}
lk_add32(module, target, offsetof(ompi_osc_sm_lock_t, read), 1);
return OMPI_SUCCESS;
}
static inline int
end_shared(ompi_osc_sm_module_t *module,
int target)
{
lk_add32(module, target, offsetof(ompi_osc_sm_lock_t, write), 1);
return OMPI_SUCCESS;
}
int
ompi_osc_sm_lock(int lock_type,
int target,
int mpi_assert,
struct ompi_win_t *win)
{
ompi_osc_sm_module_t *module =
(ompi_osc_sm_module_t*) win->w_osc_module;
int ret;
if (lock_none != module->outstanding_locks[target]) {
return OMPI_ERR_RMA_SYNC;
}
if (0 == (mpi_assert & MPI_MODE_NOCHECK)) {
if (MPI_LOCK_EXCLUSIVE == lock_type) {
module->outstanding_locks[target] = lock_exclusive;
ret = start_exclusive(module, target);
} else {
module->outstanding_locks[target] = lock_shared;
ret = start_shared(module, target);
}
} else {
module->outstanding_locks[target] = lock_nocheck;
ret = OMPI_SUCCESS;
}
return ret;
}
int
ompi_osc_sm_unlock(int target,
struct ompi_win_t *win)
{
ompi_osc_sm_module_t *module =
(ompi_osc_sm_module_t*) win->w_osc_module;
int ret;
/* ensure all memory operations have completed */
opal_atomic_mb();
switch (module->outstanding_locks[target]) {
case lock_none:
return OMPI_ERR_RMA_SYNC;
case lock_nocheck:
ret = OMPI_SUCCESS;
break;
case lock_exclusive:
ret = end_exclusive(module, target);
break;
case lock_shared:
ret = end_shared(module, target);
break;
default:
// This is an OMPI programming error -- cause some pain.
assert(module->outstanding_locks[target] == lock_none ||
module->outstanding_locks[target] == lock_nocheck ||
module->outstanding_locks[target] == lock_exclusive ||
module->outstanding_locks[target] == lock_shared);
// In non-developer builds, assert() will be a no-op, so
// ensure the error gets reported
opal_output(0, "Unknown lock type in ompi_osc_sm_unlock -- this is an OMPI programming error");
ret = OMPI_ERR_BAD_PARAM;
break;
}
module->outstanding_locks[target] = lock_none;
return ret;
}
int
ompi_osc_sm_lock_all(int mpi_assert,
struct ompi_win_t *win)
{
ompi_osc_sm_module_t *module =
(ompi_osc_sm_module_t*) win->w_osc_module;
int ret, i, comm_size;
comm_size = ompi_comm_size(module->comm);
for (i = 0 ; i < comm_size ; ++i) {
ret = ompi_osc_sm_lock(MPI_LOCK_SHARED, i, mpi_assert, win);
if (OMPI_SUCCESS != ret) return ret;
}
return OMPI_SUCCESS;
}
int
ompi_osc_sm_unlock_all(struct ompi_win_t *win)
{
ompi_osc_sm_module_t *module =
(ompi_osc_sm_module_t*) win->w_osc_module;
int ret, i, comm_size;
comm_size = ompi_comm_size(module->comm);
for (i = 0 ; i < comm_size ; ++i) {
ret = ompi_osc_sm_unlock(i, win);
if (OMPI_SUCCESS != ret) return ret;
}
return OMPI_SUCCESS;
}
int
ompi_osc_sm_sync(struct ompi_win_t *win)
{
opal_atomic_mb();
return OMPI_SUCCESS;
}
int
ompi_osc_sm_flush(int target,
struct ompi_win_t *win)
{
opal_atomic_mb();
return OMPI_SUCCESS;
}
int
ompi_osc_sm_flush_all(struct ompi_win_t *win)
{
opal_atomic_mb();
return OMPI_SUCCESS;
}
int
ompi_osc_sm_flush_local(int target,
struct ompi_win_t *win)
{
opal_atomic_mb();
return OMPI_SUCCESS;
}
int
ompi_osc_sm_flush_local_all(struct ompi_win_t *win)
{
opal_atomic_mb();
return OMPI_SUCCESS;
}
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