76 строки
2.4 KiB
C
76 строки
2.4 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2013-2014 Los Alamos National Security, LLC. All rights
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* reserved.
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* Copyright (c) 2014 Research Organization for Information Science
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* and Technology (RIST). All rights 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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#include "opal_config.h"
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#include "btl_scif_frag.h"
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#include <sys/time.h>
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#define lmin(a,b) ((a) < (b) ? (a) : (b))
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/**
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* Initiate a get operation.
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*/
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int mca_btl_scif_get (mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint, void *local_address,
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uint64_t remote_address, mca_btl_base_registration_handle_t *local_handle,
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mca_btl_base_registration_handle_t *remote_handle, size_t size, int flags,
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int order, mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
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{
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int rc, mark, scif_flags = 0;
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off_t roffset, loffset;
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#if defined(SCIF_TIMING)
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struct timespec ts;
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clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
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mca_btl_scif_component.get_count++;
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#endif
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BTL_VERBOSE(("Using DMA Get from remote address %" PRIx64 " to local address %p",
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remote_address, local_address));
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roffset = remote_handle->scif_offset + (off_t)(remote_address - remote_handle->scif_base);
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loffset = local_handle->scif_offset + (off_t)((intptr_t)local_address - local_handle->scif_base);
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if (mca_btl_scif_component.rma_use_cpu) {
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scif_flags = SCIF_RMA_USECPU;
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}
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if (mca_btl_scif_component.rma_sync) {
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scif_flags |= SCIF_RMA_SYNC;
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}
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/* start the read */
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rc = scif_readfrom (endpoint->scif_epd, loffset, size, roffset, scif_flags);
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if (OPAL_UNLIKELY(-1 == rc)) {
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return OPAL_ERROR;
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}
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if (!(scif_flags & SCIF_RMA_SYNC)) {
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/* according to the scif documentation is is better to use a fence rather
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* than using the SCIF_RMA_SYNC flag with scif_readfrom */
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scif_fence_mark (endpoint->scif_epd, SCIF_FENCE_INIT_SELF, &mark);
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scif_fence_wait (endpoint->scif_epd, mark);
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}
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#if defined(SCIF_TIMING)
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SCIF_UPDATE_TIMER(mca_btl_scif_component.get_time,
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mca_btl_scif_component.get_time_max, ts);
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#endif
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/* always call the callback function */
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cbfunc (btl, endpoint, local_address, local_handle, cbcontext, cbdata, OPAL_SUCCESS);
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return OPAL_SUCCESS;
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}
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