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smsc/cma: add support for Linux CMA single-copy
This commit adds a component to the shared-memory single-copy framework to support Linux Cross Memory Attach (CMA). This component supports copy_to and copy_from without registration. Signed-off-by: Nathan Hjelm <hjelmn@google.com> (cherry picked from commit d74e95c)
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‎opal/mca/smsc/cma/Makefile.am‎

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#
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# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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# University Research and Technology
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# Corporation. All rights reserved.
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# Copyright (c) 2004-2009 The University of Tennessee and The University
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# of Tennessee Research Foundation. All rights
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# reserved.
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# Copyright (c) 2004-2009 High Performance Computing Center Stuttgart,
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# University of Stuttgart. All rights reserved.
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# Copyright (c) 2004-2005 The Regents of the University of California.
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# All rights reserved.
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# Copyright (c) 2009-2014 Cisco Systems, Inc. All rights reserved.
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# Copyright (c) 2011-2014 Los Alamos National Security, LLC. All rights
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# reserved.
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# Copyright (c) 2017 IBM Corporation. All rights reserved.
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# Copyright (c) 2020-2021 Google, LLC. 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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EXTRA_DIST = post_configure.sh
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AM_CPPFLAGS = $(smsc_cma_CPPFLAGS)
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libmca_smsc_cma_la_sources = \
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smsc_cma_component.c \
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smsc_cma_module.c \
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smsc_cma_internal.h \
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smsc_cma.h
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# Make the output library in this directory, and name it either
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# mca_<type>_<name>.la (for DSO builds) or libmca_<type>_<name>.la
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# (for static builds).
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if MCA_BUILD_opal_smsc_cma_DSO
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component_noinst =
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component_install = mca_smsc_cma.la
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else
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component_noinst = libmca_smsc_cma.la
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component_install =
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endif
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mcacomponentdir = $(opallibdir)
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mcacomponent_LTLIBRARIES = $(component_install)
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mca_smsc_cma_la_SOURCES = $(libmca_smsc_cma_la_sources)
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mca_smsc_cma_la_LDFLAGS = -module -avoid-version $(smsc_cma_LDFLAGS)
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mca_smsc_cma_la_LIBADD = $(top_builddir)/opal/lib@OPAL_LIB_NAME@.la \
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$(smsc_cma_LIBS)
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noinst_LTLIBRARIES = $(component_noinst)
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libmca_smsc_cma_la_SOURCES = $(libmca_smsc_cma_la_sources)
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libmca_smsc_cma_la_LIBADD = $(smsc_cma_LIBS)
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libmca_smsc_cma_la_LDFLAGS = -module -avoid-version $(smsc_cma_LDFLAGS)

‎opal/mca/smsc/cma/configure.m4‎

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# -*- shell-script -*-
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#
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# Copyright (c) 2009 The University of Tennessee and The University
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# of Tennessee Research Foundation. All rights
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# reserved.
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# Copyright (c) 2009-2016 Cisco Systems, Inc. All rights reserved.
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# Copyright (c) 2011-2014 Los Alamos National Security, LLC. All rights
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# reserved.
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# Copyright (c) 2015 Research Organization for Information Science
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# and Technology (RIST). All rights reserved.
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# Copyright (c) 2021 Google, LLC. 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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# MCA_smsc_cma_CONFIG([action-if-can-compile],
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# [action-if-cant-compile])
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# ------------------------------------------------
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AC_DEFUN([MCA_opal_smsc_cma_CONFIG],[
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AC_CONFIG_FILES([opal/mca/smsc/cma/Makefile])
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OPAL_CHECK_CMA([smsc_cma], [AC_CHECK_HEADER([sys/prctl.h]) $1], [$2])
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AC_SUBST([smsc_cma_CFLAGS])
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AC_SUBST([smsc_cma_CPPFLAGS])
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AC_SUBST([smsc_cma_LDFLAGS])
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AC_SUBST([smsc_cma_LIBS])
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])dnl

‎opal/mca/smsc/cma/post_configure.sh‎

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DIRECT_CALL_HEADER="opal/mca/smsc/cma/smsc_cma.h"

‎opal/mca/smsc/cma/smsc_cma.h‎

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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2021 Google, Inc. 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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#ifndef OPAL_MCA_SMSC_CMA_SMSC_CMA_H
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#define OPAL_MCA_SMSC_CMA_SMSC_CMA_H
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#include "opal_config.h"
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#include "opal/mca/smsc/smsc.h"
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mca_smsc_endpoint_t *mca_smsc_cma_get_endpoint(opal_proc_t *peer_proc);
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void mca_smsc_cma_return_endpoint(mca_smsc_endpoint_t *endpoint);
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int mca_smsc_cma_copy_to(mca_smsc_endpoint_t *endpoint, void *local_address, void *remote_address,
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size_t size, void *reg_handle);
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int mca_smsc_cma_copy_from(mca_smsc_endpoint_t *endpoint, void *local_address, void *remote_address,
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size_t size, void *reg_handle);
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/* unsupported interfaces defined to support MCA direct */
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void *mca_smsc_cma_map_peer_region(mca_smsc_endpoint_t *endpoint, uint64_t flags,
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void *remote_address, size_t size, void **local_mapping);
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void mca_smsc_cma_unmap_peer_region(void *ctx);
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void *mca_smsc_cma_register_region(void *local_address, size_t size);
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void mca_smsc_cma_deregister_region(void *reg_data);
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#endif /* OPAL_MCA_SMSC_CMA_SMSC_CMA_H */

‎opal/mca/smsc/cma/smsc_cma_component.c‎

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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2021 Google, Inc. 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 "opal/mca/smsc/base/base.h"
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#include "opal/mca/smsc/cma/smsc_cma_internal.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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static int mca_smsc_cma_component_register(void);
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static int mca_smsc_cma_component_open(void);
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static int mca_smsc_cma_component_close(void);
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static int mca_smsc_cma_component_query(void);
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static mca_smsc_module_t *mca_smsc_cma_component_enable(void);
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#define MCA_SMSC_CMA_DEFAULT_PRIORITY 37
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static const int mca_smsc_cma_default_priority = MCA_SMSC_CMA_DEFAULT_PRIORITY;
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mca_smsc_component_t mca_smsc_cma_component = {
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.smsc_version = {
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MCA_SMSC_DEFAULT_VERSION("cma"),
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.mca_open_component = mca_smsc_cma_component_open,
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.mca_close_component = mca_smsc_cma_component_close,
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.mca_register_component_params = mca_smsc_cma_component_register,
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},
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.priority = MCA_SMSC_CMA_DEFAULT_PRIORITY,
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.query = mca_smsc_cma_component_query,
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.enable = mca_smsc_cma_component_enable,
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};
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static int mca_smsc_cma_component_register(void)
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{
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mca_smsc_base_register_default_params(&mca_smsc_cma_component, mca_smsc_cma_default_priority);
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return OPAL_SUCCESS;
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}
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static int mca_smsc_cma_component_open(void)
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{
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/* nothing to do */
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return OPAL_SUCCESS;
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}
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static int mca_smsc_cma_component_close(void)
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{
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/* nothing to do */
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return OPAL_SUCCESS;
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}
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/*
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* mca_btl_sm_parse_proc_ns_user() tries to get the user namespace ID
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* of the current process.
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* Returns the ID of the user namespace. In the case of an error '0' is returned.
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*/
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ino_t mca_smsc_cma_get_user_ns_id(void)
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{
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struct stat buf;
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if (0 > stat("/proc/self/ns/user", &buf)) {
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/*
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* Something went wrong, probably an old kernel that does not support namespaces
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* simply assume all processes are in the same user namespace and return 0
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*/
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return 0;
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}
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return buf.st_ino;
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}
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static int mca_smsc_cma_send_modex(void)
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{
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mca_smsc_cma_modex_t modex;
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modex.pid = getpid();
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modex.user_ns_id = mca_smsc_cma_get_user_ns_id();
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int rc;
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OPAL_MODEX_SEND(rc, PMIX_LOCAL, &mca_smsc_cma_component.smsc_version, &modex, sizeof(modex));
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return rc;
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}
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static int mca_smsc_cma_component_query(void)
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{
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/* Check if we have the proper permissions for CMA */
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char buffer = '0';
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bool cma_happy = false;
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/* check system setting for current ptrace scope */
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int fd = open("/proc/sys/kernel/yama/ptrace_scope", O_RDONLY);
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if (0 <= fd) {
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int ret = read(fd, &buffer, 1);
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if (ret < 0) {
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opal_output_verbose(MCA_BASE_VERBOSE_COMPONENT,
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opal_smsc_base_framework.framework_output,
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"mca_smsc_cma_component_query: could not read ptrace_scope. "
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"assuming ptrace scope is 0");
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}
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close(fd);
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}
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/* ptrace scope 0 will allow an attach from any of the process owner's
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* processes. ptrace scope 1 limits attachers to the process tree
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* starting at the parent of this process. */
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if ('0' != buffer) {
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#if defined PR_SET_PTRACER
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/* try setting the ptrace scope to allow attach */
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int ret = prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
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if (0 == ret) {
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cma_happy = true;
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}
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#endif
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} else {
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cma_happy = true;
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}
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if (!cma_happy) {
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opal_output_verbose(MCA_BASE_VERBOSE_COMPONENT, opal_smsc_base_framework.framework_output,
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"mca_smsc_cma_component_query: could not select for use. insufficient "
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"ptrace permissions.");
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mca_smsc_cma_component.priority = -1;
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return OPAL_ERR_NOT_AVAILABLE;
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}
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mca_smsc_cma_send_modex();
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return OPAL_SUCCESS;
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}
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static mca_smsc_module_t *mca_smsc_cma_component_enable(void)
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{
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if (0 > mca_smsc_cma_component.priority) {
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return NULL;
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}
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return &mca_smsc_cma_module;
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}

‎opal/mca/smsc/cma/smsc_cma_internal.h‎

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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2021 Google, Inc. 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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#ifndef OPAL_MCA_SMSC_CMA_SMSC_CMA_INTERNAL_H
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#define OPAL_MCA_SMSC_CMA_SMSC_CMA_INTERNAL_H
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#include "opal/mca/smsc/cma/smsc_cma.h"
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struct mca_smsc_cma_modex_t {
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pid_t pid;
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ino_t user_ns_id;
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};
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typedef struct mca_smsc_cma_modex_t mca_smsc_cma_modex_t;
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struct mca_smsc_cma_endpoint_t {
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mca_smsc_endpoint_t super;
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pid_t pid;
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};
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typedef struct mca_smsc_cma_endpoint_t mca_smsc_cma_endpoint_t;
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OBJ_CLASS_DECLARATION(mca_smsc_cma_endpoint_t);
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extern mca_smsc_module_t mca_smsc_cma_module;
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extern mca_smsc_component_t mca_smsc_cma_component;
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ino_t mca_smsc_cma_get_user_ns_id(void);
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#endif /* OPAL_MCA_SMSC_CMA_SMSC_CMA_INTERNAL_H */

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