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/*
* Copyright (c) 2014 Intel, Inc. All rights reserved.
* Copyright (c) 2014 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2015 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2017-2022 Amazon.com, Inc. or its affiliates.
* All Rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*
* These symbols are in a file by themselves to provide nice linker
* semantics. Since linkers generally pull in symbols by object
* files, keeping these symbols as the only symbols in this file
* prevents utility programs such as "ompi_info" from having to import
* entire components just to query their version and parameters.
*/
#include "opal_config.h"
#include <cuda.h>
#include "accelerator_cuda.h"
#include "opal/mca/accelerator/base/base.h"
#include "opal/mca/dl/base/base.h"
#include "opal/runtime/opal_params.h"
#include "opal/util/argv.h"
#include "opal/util/printf.h"
#include "opal/util/proc.h"
#include "opal/util/show_help.h"
#include "opal/sys/atomic.h"
/* Define global variables, used in accelerator_cuda.c */
CUstream opal_accelerator_cuda_memcpy_stream = NULL;
opal_mutex_t opal_accelerator_cuda_stream_lock = {0};
int opal_accelerator_cuda_num_devices = 0;
/* Initialization lock for delayed cuda initialization */
static opal_mutex_t accelerator_cuda_init_lock;
static bool accelerator_cuda_init_complete = false;
#define STRINGIFY2(x) #x
#define STRINGIFY(x) STRINGIFY2(x)
/* Unused variable that we register at init time and unregister at fini time.
* This is used to detect if user has done a device reset prior to MPI_Finalize.
* This is a workaround to avoid SEGVs.
*/
static int checkmem;
static int ctx_ok = 1;
/*
* Public string showing the accelerator cuda component version number
*/
const char *opal_accelerator_cuda_component_version_string
= "OPAL cuda accelerator MCA component version " OPAL_VERSION;
/*
* Local function
*/
static int accelerator_cuda_open(void);
static int accelerator_cuda_close(void);
static int accelerator_cuda_component_register(void);
static opal_accelerator_base_module_t* accelerator_cuda_init(void);
static void accelerator_cuda_finalize(opal_accelerator_base_module_t* module);
/*
* Instantiate the public struct with all of our public information
* and pointers to our public functions in it
*/
opal_accelerator_cuda_component_t mca_accelerator_cuda_component = {{
/* First, the mca_component_t struct containing meta information
* about the component itself */
.base_version =
{
/* Indicate that we are a accelerator v1.1.0 component (which also
* implies a specific MCA version) */
OPAL_ACCELERATOR_BASE_VERSION_1_0_0,
/* Component name and version */
.mca_component_name = "cuda",
MCA_BASE_MAKE_VERSION(component, OPAL_MAJOR_VERSION, OPAL_MINOR_VERSION,
OPAL_RELEASE_VERSION),
/* Component open and close functions */
.mca_open_component = accelerator_cuda_open,
.mca_close_component = accelerator_cuda_close,
.mca_register_component_params = accelerator_cuda_component_register,
},
/* Next the MCA v1.0.0 component meta data */
.base_data =
{ /* The component is checkpoint ready */
MCA_BASE_METADATA_PARAM_CHECKPOINT},
.accelerator_init = accelerator_cuda_init,
.accelerator_finalize = accelerator_cuda_finalize,
}};
static int accelerator_cuda_open(void)
{
/* construct the component fields */
return OPAL_SUCCESS;
}
static int accelerator_cuda_close(void)
{
return OPAL_SUCCESS;
}
static int accelerator_cuda_component_register(void)
{
return OPAL_SUCCESS;
}
int opal_accelerator_cuda_delayed_init()
{
int result = OPAL_SUCCESS;
CUcontext cuContext;
/* Double checked locking to avoid having to
* grab locks post lazy-initialization. */
opal_atomic_rmb();
if (true == accelerator_cuda_init_complete) {
return OPAL_SUCCESS;
}
OPAL_THREAD_LOCK(&accelerator_cuda_init_lock);
/* If already initialized, just exit */
if (true == accelerator_cuda_init_complete) {
goto out;
}
cuDeviceGetCount(&opal_accelerator_cuda_num_devices);
/* Check to see if this process is running in a CUDA context. If
* so, all is good. If not, then disable registration of memory. */
result = cuCtxGetCurrent(&cuContext);
if (CUDA_SUCCESS != result) {
opal_output_verbose(20, opal_accelerator_base_framework.framework_output, "CUDA: cuCtxGetCurrent failed");
goto out;
} else if ((CUDA_SUCCESS == result) && (NULL == cuContext)) {
opal_output_verbose(20, opal_accelerator_base_framework.framework_output, "CUDA: cuCtxGetCurrent returned NULL context");
result = OPAL_ERROR;
goto out;
} else {
opal_output_verbose(20, opal_accelerator_base_framework.framework_output, "CUDA: cuCtxGetCurrent succeeded");
}
/* Create stream for use in cuMemcpyAsync synchronous copies */
result = cuStreamCreate(&opal_accelerator_cuda_memcpy_stream, 0);
if (OPAL_UNLIKELY(result != CUDA_SUCCESS)) {
opal_show_help("help-accelerator-cuda.txt", "cuStreamCreate failed", true,
OPAL_PROC_MY_HOSTNAME, result);
goto out;
}
result = cuMemHostRegister(&checkmem, sizeof(int), 0);
if (result != CUDA_SUCCESS) {
/* If registering the memory fails, print a message and continue.
* This is not a fatal error. */
opal_show_help("help-accelerator-cuda.txt", "cuMemHostRegister during init failed", true,
&checkmem, sizeof(int), OPAL_PROC_MY_HOSTNAME, result, "checkmem");
} else {
opal_output_verbose(20, opal_accelerator_base_framework.framework_output,
"CUDA: cuMemHostRegister OK on test region");
}
result = OPAL_SUCCESS;
opal_atomic_wmb();
accelerator_cuda_init_complete = true;
out:
OPAL_THREAD_UNLOCK(&accelerator_cuda_init_lock);
return result;
}
static opal_accelerator_base_module_t* accelerator_cuda_init(void)
{
OBJ_CONSTRUCT(&opal_accelerator_cuda_stream_lock, opal_mutex_t);
OBJ_CONSTRUCT(&accelerator_cuda_init_lock, opal_mutex_t);
/* First check if the support is enabled. In the case that the user has
* turned it off, we do not need to continue with any CUDA specific
* initialization. Do this after MCA parameter registration. */
if (!opal_cuda_support) {
return NULL;
}
opal_accelerator_cuda_delayed_init();
return &opal_accelerator_cuda_module;
}
static void accelerator_cuda_finalize(opal_accelerator_base_module_t* module)
{
CUresult result;
/* This call is in here to make sure the context is still valid.
* This was the one way of checking which did not cause problems
* while calling into the CUDA library. This check will detect if
* a user has called cudaDeviceReset prior to MPI_Finalize. If so,
* then this call will fail and we skip cleaning up CUDA resources. */
result = cuMemHostUnregister(&checkmem);
if (CUDA_SUCCESS != result) {
ctx_ok = 0;
}
if ((NULL != opal_accelerator_cuda_memcpy_stream) && ctx_ok) {
cuStreamDestroy(opal_accelerator_cuda_memcpy_stream);
}
OBJ_DESTRUCT(&opal_accelerator_cuda_stream_lock);
OBJ_DESTRUCT(&accelerator_cuda_init_lock);
return;
}
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