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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2021 Google, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include "opal/mca/smsc/base/base.h"
#include "opal/mca/smsc/xpmem/smsc_xpmem_internal.h"
#include "opal/util/minmax.h"
#include <fcntl.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static int mca_smsc_xpmem_component_register(void);
static int mca_smsc_xpmem_component_open(void);
static int mca_smsc_xpmem_component_close(void);
static int mca_smsc_xpmem_component_query(void);
static mca_smsc_module_t *mca_smsc_xpmem_component_enable(void);
#define MCA_SMSC_XPMEM_DEFAULT_PRIORITY 42
static const int mca_smsc_xpmem_default_priority = MCA_SMSC_XPMEM_DEFAULT_PRIORITY;
mca_smsc_xpmem_component_t mca_smsc_xpmem_component = {
.super = {
.smsc_version = {
MCA_SMSC_DEFAULT_VERSION("xpmem"),
.mca_open_component = mca_smsc_xpmem_component_open,
.mca_close_component = mca_smsc_xpmem_component_close,
.mca_register_component_params = mca_smsc_xpmem_component_register,
},
.priority = MCA_SMSC_XPMEM_DEFAULT_PRIORITY,
.query = mca_smsc_xpmem_component_query,
.enable = mca_smsc_xpmem_component_enable,
},
};
static int mca_smsc_xpmem_component_register(void)
{
mca_smsc_xpmem_component.log_attach_align = 23;
(void) mca_base_component_var_register(&mca_smsc_xpmem_component.super.smsc_version,
"log_align",
"Log base 2 of the alignment to use for xpmem "
"segments (default: 23, minimum: 12, maximum: 25)",
MCA_BASE_VAR_TYPE_INT, /*enumerator=*/NULL, /*bind=*/0,
MCA_BASE_VAR_FLAG_SETTABLE, OPAL_INFO_LVL_5,
MCA_BASE_VAR_SCOPE_LOCAL,
&mca_smsc_xpmem_component.log_attach_align);
mca_smsc_xpmem_component.memcpy_chunk_size = 262144;
(void) mca_base_component_var_register(
&mca_smsc_xpmem_component.super.smsc_version, "memcpy_chunk_size",
"Maximum size to copy with a single call to memcpy. On some systems a smaller or larger "
"number may provide better performance (default: 256k)",
MCA_BASE_VAR_TYPE_UINT64_T, /*enumerator=*/NULL, /*bind=*/0, MCA_BASE_VAR_FLAG_SETTABLE,
OPAL_INFO_LVL_5, MCA_BASE_VAR_SCOPE_LOCAL, &mca_smsc_xpmem_component.memcpy_chunk_size);
mca_smsc_base_register_default_params(&mca_smsc_xpmem_component.super,
mca_smsc_xpmem_default_priority);
return OPAL_SUCCESS;
}
static int mca_smsc_xpmem_component_open(void)
{
/* nothing to do */
return OPAL_SUCCESS;
}
static int mca_smsc_xpmem_component_close(void)
{
if (mca_smsc_xpmem_module.vma_module) {
OBJ_RELEASE(mca_smsc_xpmem_module.vma_module);
}
return OPAL_SUCCESS;
}
static int mca_smsc_xpmem_send_modex(void)
{
mca_smsc_xpmem_modex_t modex;
modex.seg_id = mca_smsc_xpmem_component.my_seg_id;
modex.address_max = mca_smsc_xpmem_component.my_address_max;
int rc;
OPAL_MODEX_SEND(rc, PMIX_LOCAL, &mca_smsc_xpmem_component.super.smsc_version, &modex,
sizeof(modex));
return rc;
}
static int mca_smsc_xpmem_component_query(void)
{
/* Any attachment that goes past the Linux TASK_SIZE will always fail. To prevent this we need
* to determine the value of TASK_SIZE. On x86_64 the value was hard-coded in sm to be
* 0x7ffffffffffful but this approach does not work with AARCH64 (and possibly other
* architectures). Since there is really no way to directly determine the value we can (in all
* cases?) look through the mapping for this process to determine what the largest address is.
* This should be the top of the stack. No heap allocations should be larger than this value.
* Since the largest address may differ between processes the value must be shared as part of
* the modex and stored in the endpoint. */
FILE *fh = fopen("/proc/self/maps", "r");
if (NULL == fh) {
opal_output_verbose(MCA_BASE_VERBOSE_COMPONENT, opal_smsc_base_framework.framework_output,
"mca_smsc_xpmem_component_query: could not open /proc/self/maps for "
"reading. disabling XPMEM");
return OPAL_ERR_NOT_AVAILABLE;
}
char buffer[1024];
uintptr_t address_max = 0;
while (fgets(buffer, sizeof(buffer), fh)) {
uintptr_t low, high;
char *tmp;
/* each line of /proc/self/maps starts with low-high in hexadecimal (without a 0x) */
low = strtoul(buffer, &tmp, 16);
high = strtoul(tmp + 1, NULL, 16);
if (address_max < high) {
address_max = high;
}
}
fclose(fh);
if (0 == address_max) {
opal_output_verbose(MCA_BASE_VERBOSE_COMPONENT, opal_smsc_base_framework.framework_output,
"mca_smsc_xpmem_component_query: could not determine the address max");
return OPAL_ERR_NOT_AVAILABLE;
}
/* save the calculated maximum */
mca_smsc_xpmem_component.my_address_max = address_max - 1;
/* it is safe to use XPMEM_MAXADDR_SIZE here (which is always (size_t)-1 even though
* it is not safe for attach */
mca_smsc_xpmem_component.my_seg_id = xpmem_make(0, XPMEM_MAXADDR_SIZE, XPMEM_PERMIT_MODE,
(void *) 0666);
if (-1 == mca_smsc_xpmem_component.my_seg_id) {
return OPAL_ERR_NOT_AVAILABLE;
}
mca_smsc_xpmem_send_modex();
return OPAL_SUCCESS;
}
static mca_smsc_module_t *mca_smsc_xpmem_component_enable(void)
{
if (0 > mca_smsc_xpmem_component.super.priority) {
return NULL;
}
/* limit segment alignment to be between 4k and 16M */
mca_smsc_xpmem_component.log_attach_align
= opal_min(opal_max(mca_smsc_xpmem_component.log_attach_align, 12), 25);
mca_smsc_xpmem_module.vma_module = mca_rcache_base_vma_module_alloc();
return &mca_smsc_xpmem_module.super;
}
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