353 строки
12 KiB
C
353 строки
12 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2014-2017 Los Alamos National Security, LLC. All rights
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* reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#if !defined(OMPI_OSC_RDMA_LOCK_H)
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#define OMPI_OSC_RDMA_LOCK_H
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#include "osc_rdma_types.h"
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#include "osc_rdma_frag.h"
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static inline int ompi_osc_rdma_trylock_local (volatile ompi_osc_rdma_lock_t *lock)
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{
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return !ompi_osc_rdma_lock_cmpset (lock, 0, OMPI_OSC_RDMA_LOCK_EXCLUSIVE);
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}
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static inline void ompi_osc_rdma_unlock_local (volatile ompi_osc_rdma_lock_t *lock)
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{
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(void) ompi_osc_rdma_lock_add (lock, -OMPI_OSC_RDMA_LOCK_EXCLUSIVE);
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}
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/**
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* Dummy completion function for atomic operations
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*/
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void ompi_osc_rdma_atomic_complete (mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint,
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void *local_address, mca_btl_base_registration_handle_t *local_handle,
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void *context, void *data, int status);
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__opal_attribute_always_inline__
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static inline int ompi_osc_rdma_lock_btl_fop (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer, uint64_t address,
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int op, ompi_osc_rdma_lock_t operand, ompi_osc_rdma_lock_t *result)
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{
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volatile bool atomic_complete = false;
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ompi_osc_rdma_frag_t *frag = NULL;
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ompi_osc_rdma_lock_t *temp = NULL;
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int ret;
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/* spin until the btl has accepted the operation */
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do {
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if (NULL == frag) {
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ret = ompi_osc_rdma_frag_alloc (module, 8, &frag, (char **) &temp);
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}
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if (NULL != frag) {
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ret = module->selected_btl->btl_atomic_fop (module->selected_btl, peer->state_endpoint, temp, (intptr_t) address,
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frag->handle, peer->state_handle, op, operand, 0,
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MCA_BTL_NO_ORDER, ompi_osc_rdma_atomic_complete, (void *) &atomic_complete,
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NULL);
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}
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if (OPAL_LIKELY(!ompi_osc_rdma_oor(ret))) {
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break;
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}
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ompi_osc_rdma_progress (module);
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} while (1);
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if (OPAL_SUCCESS == ret) {
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while (!atomic_complete) {
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ompi_osc_rdma_progress (module);
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}
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} else if (1 == ret) {
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ret = OMPI_SUCCESS;
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}
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if (NULL != frag) {
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if (result) {
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*result = *temp;
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}
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ompi_osc_rdma_frag_complete (frag);
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}
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return ret;
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}
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__opal_attribute_always_inline__
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static inline int ompi_osc_rdma_lock_btl_op (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer, uint64_t address,
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int op, ompi_osc_rdma_lock_t operand)
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{
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volatile bool atomic_complete = false;
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int ret;
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if (!(module->selected_btl->btl_flags & MCA_BTL_FLAGS_ATOMIC_OPS)) {
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return ompi_osc_rdma_lock_btl_fop (module, peer, address, op, operand, NULL);
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}
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/* spin until the btl has accepted the operation */
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do {
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ret = module->selected_btl->btl_atomic_op (module->selected_btl, peer->state_endpoint, (intptr_t) address, peer->state_handle,
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op, operand, 0, MCA_BTL_NO_ORDER, ompi_osc_rdma_atomic_complete,
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(void *) &atomic_complete, NULL);
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if (OPAL_LIKELY(!ompi_osc_rdma_oor(ret))) {
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break;
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}
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ompi_osc_rdma_progress (module);
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} while (1);
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if (OPAL_SUCCESS == ret) {
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while (!atomic_complete) {
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ompi_osc_rdma_progress (module);
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}
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} else if (1 == ret) {
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ret = OMPI_SUCCESS;
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}
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return ret;
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}
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__opal_attribute_always_inline__
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static inline int ompi_osc_rdma_lock_btl_cswap (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer, uint64_t address,
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ompi_osc_rdma_lock_t compare, ompi_osc_rdma_lock_t value, ompi_osc_rdma_lock_t *result)
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{
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volatile bool atomic_complete = false;
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ompi_osc_rdma_frag_t *frag = NULL;
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ompi_osc_rdma_lock_t *temp = NULL;
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int ret;
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/* spin until the btl has accepted the operation */
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do {
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if (NULL == frag) {
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ret = ompi_osc_rdma_frag_alloc (module, 8, &frag, (char **) &temp);
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}
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if (NULL != frag) {
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ret = module->selected_btl->btl_atomic_cswap (module->selected_btl, peer->state_endpoint, temp, address, frag->handle,
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peer->state_handle, compare, value, 0, 0, ompi_osc_rdma_atomic_complete,
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(void *) &atomic_complete, NULL);
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}
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if (OPAL_LIKELY(!ompi_osc_rdma_oor(ret))) {
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break;
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}
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ompi_osc_rdma_progress (module);
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} while (1);
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if (OPAL_SUCCESS == ret) {
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while (!atomic_complete) {
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ompi_osc_rdma_progress (module);
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}
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} else if (1 == ret) {
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ret = OMPI_SUCCESS;
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}
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if (NULL != frag) {
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if (*result) {
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*result = *temp;
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}
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ompi_osc_rdma_frag_complete (frag);
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}
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return ret;
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}
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/**
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* ompi_osc_rdma_lock_acquire_shared:
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*
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* @param[in] module - osc/rdma module
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* @param[in] peer - peer object
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* @param[in] value - increment value
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* @param[in] offset - offset of lock in remote peer's state segment
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*
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* @returns OMPI_SUCCESS on success and another ompi error code on failure
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*
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* This function increments a remote shared lock. The value provided in
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* {value} should be the negative of the one used for ompi_osc_rdma_lock_acquire_shared.
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* It is erroneous to release a shared lock not held by the calling process.
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*/
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static inline int ompi_osc_rdma_lock_release_shared (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
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ompi_osc_rdma_lock_t value, ptrdiff_t offset)
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{
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uint64_t lock = (uint64_t) (intptr_t) peer->state + offset;
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "releasing shared lock %" PRIx64 " on peer %d. value 0x%lx", lock,
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peer->rank, (unsigned long) value);
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if (!ompi_osc_rdma_peer_local_state (peer)) {
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return ompi_osc_rdma_lock_btl_op (module, peer, lock, MCA_BTL_ATOMIC_ADD, value);
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}
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(void) ompi_osc_rdma_lock_add ((volatile ompi_osc_rdma_lock_t *) lock, value);
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return OMPI_SUCCESS;
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}
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/**
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* ompi_osc_rdma_lock_acquire_shared:
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*
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* @param[in] module - osc rdma module
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* @param[in] peer - owner of lock
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* @param[in] value - increment value
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* @param[in] offset - offset of lock in remote peer's state segment
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* @param[in] check - check value for success
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*
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* @returns OMPI_SUCCESS on success and another ompi error code on failure
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*
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* This function increments a remote shared lock and checks it against the
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* check value in {check}. If any of the bits in the prior counter value
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* match those in {check} the function decrements the value and tries again.
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*/
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static inline int ompi_osc_rdma_lock_acquire_shared (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
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ompi_osc_rdma_lock_t value, ptrdiff_t offset,
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ompi_osc_rdma_lock_t check)
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{
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uint64_t lock = (uint64_t) peer->state + offset;
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ompi_osc_rdma_lock_t lock_state;
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int ret;
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "acquiring shared lock %" PRIx64 " on peer %d. value 0x%lx", lock,
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peer->rank, (unsigned long) value);
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/* spin until the lock has been acquired */
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if (!ompi_osc_rdma_peer_local_state (peer)) {
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do {
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ret = ompi_osc_rdma_lock_btl_fop (module, peer, lock, MCA_BTL_ATOMIC_ADD, value, &lock_state);
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if (OPAL_UNLIKELY(OPAL_SUCCESS != ret)) {
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "failed to increment shared lock. opal error code %d", ret);
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return ret;
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}
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "shared lock incremented. old value 0x%lx", (unsigned long) lock_state);
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if (!(lock_state & check)) {
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break;
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}
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "another peer has exclusive access to lock");
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/* NTH: i think this is correct. backoff! */
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ompi_osc_rdma_lock_release_shared (module, peer, -value, offset);
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ompi_osc_rdma_progress (module);
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} while (1);
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} else {
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do {
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lock_state = ompi_osc_rdma_lock_add ((volatile ompi_osc_rdma_lock_t *) lock, value);
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "local shared lock incremented. old value 0x%lx",
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(unsigned long) lock_state);
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if (!(lock_state & check)) {
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break;
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}
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(void) ompi_osc_rdma_lock_add ((volatile ompi_osc_rdma_lock_t *) lock, -value);
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ompi_osc_rdma_progress (module);
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} while (1);
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}
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "shared lock acquired");
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return OMPI_SUCCESS;
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}
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/**
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* ompi_osc_rdma_lock_try_acquire_exclusive:
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*
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* @param[in] module - osc/rdma module
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* @param[in] peer - peer object
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* @param[in] offset - offset of lock in peer's state structure
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*
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* @returns 0 on success, 1 on failure
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*
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* This function attempts to obtain an exclusive lock at {offset} in a peer's state.
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*/
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static inline int ompi_osc_rdma_lock_try_acquire_exclusive (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
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ptrdiff_t offset)
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{
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uint64_t lock = (uint64_t) (uintptr_t) peer->state + offset;
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int ret;
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "trying to acquire exclusive lock %" PRIx64 " on peer %d", lock,
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peer->rank);
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if (!ompi_osc_rdma_peer_local_state (peer)) {
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/* set the temporary value so we can detect success. note that a lock should never be -1 */
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ompi_osc_rdma_lock_t lock_state = -1;
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ret = ompi_osc_rdma_lock_btl_cswap (module, peer, lock, 0, OMPI_OSC_RDMA_LOCK_EXCLUSIVE, &lock_state);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != ret)) {
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return ret;
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}
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#if OPAL_ENABLE_DEBUG
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if (0 == lock_state) {
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "exclusive lock acquired");
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} else {
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "could not acquire exclusive lock");
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}
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#endif
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return lock_state != 0;
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}
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return ompi_osc_rdma_trylock_local ((int64_t *)(intptr_t) lock);
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}
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/**
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* ompi_osc_rdma_lock_acquire_exclusive:
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*
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* @param[in] module - osc/rdma module
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* @param[in] peer - peer object
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* @param[in] offset - offset into the remote peer's state segment
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*
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* @returns OMPI_SUCCESS on success or another ompi error code on failure
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*
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* This function obtains an exclusive lock at {offset} in a peer's state.
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*/
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static inline int ompi_osc_rdma_lock_acquire_exclusive (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
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ptrdiff_t offset)
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{
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int ret;
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while (1 != (ret = ompi_osc_rdma_lock_try_acquire_exclusive (module, peer, offset))) {
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ompi_osc_rdma_progress (module);
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}
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return ret;
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}
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/**
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* ompi_osc_rdma_lock_release_exclusive:
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*
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* @param[in] peer - peer to unlock
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* @param[in] offset - offset into the remote peer's state segment
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*
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* @returns OMPI_SUCCESS on success or another ompi error code on failure
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*
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* This function unlocks the lock at {offset} in the remote peer's state
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* structure. It is illegal to call this function unless this process
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* holds the lock.
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*/
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static inline int ompi_osc_rdma_lock_release_exclusive (ompi_osc_rdma_module_t *module, ompi_osc_rdma_peer_t *peer,
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ptrdiff_t offset)
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{
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uint64_t lock = (uint64_t) (intptr_t) peer->state + offset;
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int ret = OMPI_SUCCESS;
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "releasing exclusive lock %" PRIx64 " on peer %d", lock, peer->rank);
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if (!ompi_osc_rdma_peer_local_state (peer)) {
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ret = ompi_osc_rdma_lock_btl_op (module, peer, lock, MCA_BTL_ATOMIC_ADD, -OMPI_OSC_RDMA_LOCK_EXCLUSIVE);
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} else {
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ompi_osc_rdma_unlock_local ((volatile ompi_osc_rdma_lock_t *)(intptr_t) lock);
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}
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OSC_RDMA_VERBOSE(MCA_BASE_VERBOSE_DEBUG, "exclusive lock released");
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return ret;
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}
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#endif /* OMPI_OSC_RDMA_LOCK_H */
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