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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2014 Mellanox Technologies, 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.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "oshmem_config.h"
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif /* HAVE_SYS_MMAN_H */
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_SYS_IPC_H
#include <sys/ipc.h>
#endif /* HAVE_SYS_IPC_H */
#if HAVE_SYS_SHM_H
#include <sys/shm.h>
#endif /* HAVE_SYS_SHM_H */
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#include "opal/constants.h"
#include "opal/util/show_help.h"
#include "opal/util/output.h"
#include "opal/util/sys_limits.h"
#include "oshmem/mca/sshmem/sshmem.h"
#include "oshmem/mca/sshmem/base/base.h"
#include "sshmem_sysv.h"
/* public string showing the shmem ompi_sysv component version number */
const char *mca_sshmem_sysv_component_version_string =
"OSHMEM sysv sshmem MCA component version " OSHMEM_VERSION;
/* local functions */
static int sysv_register (void);
static int sysv_open(void);
static int sysv_query(mca_base_module_t **module, int *priority);
static int sysv_runtime_query(mca_base_module_t **module,
int *priority,
const char *hint);
/* instantiate the public struct with all of our public information
* and pointers to our public functions in it
*/
mca_sshmem_sysv_component_t mca_sshmem_sysv_component = {
/* ////////////////////////////////////////////////////////////////////// */
/* super */
/* ////////////////////////////////////////////////////////////////////// */
{
/* common MCA component data */
.base_version = {
MCA_SSHMEM_BASE_VERSION_2_0_0,
/* component name and version */
.mca_component_name = "sysv",
MCA_BASE_MAKE_VERSION(component, OSHMEM_MAJOR_VERSION, OSHMEM_MINOR_VERSION,
OSHMEM_RELEASE_VERSION),
.mca_open_component = sysv_open,
.mca_query_component = sysv_query,
.mca_register_component_params = sysv_register,
},
/* MCA v2.0.0 component meta data */
.base_data = {
/* the component is checkpoint ready */
MCA_BASE_METADATA_PARAM_CHECKPOINT
},
.runtime_query = sysv_runtime_query,
},
/* ////////////////////////////////////////////////////////////////////// */
/* sysv component-specific information */
/* see: shmem_sysv.h for more information */
};
/* ////////////////////////////////////////////////////////////////////////// */
static int
sysv_runtime_query(mca_base_module_t **module,
int *priority,
const char *hint)
{
char c = 'j';
int shmid = -1;
char *a = NULL;
char *addr = NULL;
struct shmid_ds tmp_buff;
int flags;
int ret;
ret = OSHMEM_SUCCESS;
*priority = 0;
*module = NULL;
/* if we are here, then let the run-time test games begin */
#if defined (SHM_HUGETLB)
if (mca_sshmem_sysv_component.use_hp != 0) {
flags = IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | SHM_HUGETLB;
if (-1 == (shmid = shmget(IPC_PRIVATE, sshmem_sysv_gethugepagesize(), flags))) {
if (mca_sshmem_sysv_component.use_hp == 1) {
mca_sshmem_sysv_component.use_hp = 0;
ret = OSHMEM_ERR_NOT_AVAILABLE;
goto out;
}
mca_sshmem_sysv_component.use_hp = 0;
}
else if ((void *)-1 == (addr = shmat(shmid, NULL, 0))) {
shmctl(shmid, IPC_RMID, NULL);
if (mca_sshmem_sysv_component.use_hp == 1) {
mca_sshmem_sysv_component.use_hp = 0;
ret = OSHMEM_ERR_NOT_AVAILABLE;
goto out;
}
mca_sshmem_sysv_component.use_hp = 0;
}
}
#else
if (mca_sshmem_sysv_component.use_hp == 1) {
mca_sshmem_sysv_component.use_hp = 0;
ret = OSHMEM_ERR_NOT_AVAILABLE;
goto out;
}
mca_sshmem_sysv_component.use_hp = 0;
#endif
if (0 == mca_sshmem_sysv_component.use_hp) {
flags = IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR;
if (-1 == (shmid = shmget(IPC_PRIVATE, (size_t)(opal_getpagesize()), flags))) {
ret = OSHMEM_ERR_NOT_AVAILABLE;
goto out;
}
else if ((void *)-1 == (addr = shmat(shmid, NULL, 0))) {
shmctl(shmid, IPC_RMID, NULL);
ret = OSHMEM_ERR_NOT_AVAILABLE;
goto out;
}
}
/* protect against lazy establishment - may not be needed, but can't hurt */
a = addr;
*a = c;
if (-1 == shmctl(shmid, IPC_RMID, NULL)) {
goto out;
}
else if (-1 == shmctl(shmid, IPC_STAT, &tmp_buff)) {
goto out;
}
/* all is well - rainbows and butterflies */
else {
*priority = mca_sshmem_sysv_component.priority;
*module = (mca_base_module_t *)&mca_sshmem_sysv_module.super;
}
out:
if ((char *)-1 != addr) {
shmdt(addr);
}
return ret;
}
/* ////////////////////////////////////////////////////////////////////////// */
static int
sysv_register(void)
{
/* ////////////////////////////////////////////////////////////////////// */
/* (default) priority - set lower than mmap's priority */
mca_sshmem_sysv_component.priority = 30;
(void) mca_base_component_var_register(&mca_sshmem_sysv_component.super.base_version,
"priority", "Priority for the sshmem sysv "
"component (default: 30)", MCA_BASE_VAR_TYPE_INT,
NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_3,
MCA_BASE_VAR_SCOPE_ALL_EQ,
&mca_sshmem_sysv_component.priority);
mca_sshmem_sysv_component.use_hp = -1;
mca_base_component_var_register (&mca_sshmem_sysv_component.super.base_version,
"use_hp", "Huge pages usage "
"[0 - off, 1 - on, -1 - auto] (default: -1)", MCA_BASE_VAR_TYPE_INT,
NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_4,
MCA_BASE_VAR_SCOPE_ALL_EQ,
&mca_sshmem_sysv_component.use_hp);
return OSHMEM_SUCCESS;
}
/* ////////////////////////////////////////////////////////////////////////// */
static int
sysv_open(void)
{
return OSHMEM_SUCCESS;
}
/* ////////////////////////////////////////////////////////////////////////// */
static int
sysv_query(mca_base_module_t **module, int *priority)
{
*priority = mca_sshmem_sysv_component.priority;
*module = (mca_base_module_t *)&mca_sshmem_sysv_module.super;
return OSHMEM_SUCCESS;
}
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