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# -*- shell-script -*-
#
# Copyright (c) 2009 The University of Tennessee and The University
# of Tennessee Research Foundation. All rights
# reserved.
# Copyright (c) 2009-2016 Cisco Systems, Inc. All rights reserved.
# Copyright (c) 2010-2022 IBM Corporation. All rights reserved.
# Copyright (c) 2013-2016 Los Alamos National Security, LLC. All rights
# reserved.
# Copyright (c) 2022 Amazon.com, Inc. or its affiliates. All Rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# OPAL_CHECK_CMA(prefix, [action-if-found], [action-if-not-found])
# --------------------------------------------------------
# check if cma support is wanted.
AC_DEFUN([OPAL_CHECK_CMA],[
AC_ARG_WITH([cma],
[AS_HELP_STRING([--with-cma],
[Build Cross Memory Attach support (default: autodetect)])])
if test "x$with_cma" = "xno" ; then
opal_check_cma_happy=0
fi
# We only need to do the back-end test once
if test -z "$opal_check_cma_happy" ; then
OPAL_CHECK_CMA_BACKEND
fi
AS_IF([test $opal_check_cma_happy -eq 1],
[$2],
[if test "$with_cma" = "yes"; then
AC_MSG_WARN([--with-cma support requested, but not available])
AC_MSG_ERROR([Cannot continue])
fi
$3])
])
AC_DEFUN([OPAL_CHECK_CMA_BACKEND],
[
OPAL_VAR_SCOPE_PUSH([opal_check_cma_need_defs opal_check_cma_kernel_version opal_check_cma_CFLAGS opal_check_cma_msg])
# Some systems have process_cm_readv() in libc, which means CMA is
# supported. Other systems do not have process_cm_readv() in
# libc, but have support for it in the kernel if we invoke it
# directly. Check for both.
AC_CHECK_HEADERS([sys/prctl.h])
AC_CHECK_FUNC([process_vm_readv], [opal_check_cma_need_defs=0],
[opal_check_cma_need_defs=1])
AC_DEFINE_UNQUOTED([OPAL_CMA_NEED_SYSCALL_DEFS],
[$opal_check_cma_need_defs],
[Need CMA syscalls defined])
if test $opal_check_cma_need_defs -eq 1 ; then
opal_check_cma_CFLAGS=$CFLAGS
# Need some extra include paths to locate the appropriate headers
CFLAGS="$CFLAGS -I${srcdir} -I${srcdir}/opal/include"
AC_MSG_CHECKING([if internal syscall numbers for Linux CMA work])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include "opal/include/opal/sys/cma.h"
static void do_check (pid_t pid, int *in, int *out)
{
int check[4] = {0, 0, 0, 0}, i;
struct iovec rem_iov = {out, sizeof (check)};
struct iovec loc_iov = {check, sizeof (check)};
ssize_t rc;
rc = process_vm_readv (pid, &loc_iov, 1, &rem_iov, 1, 0);
if (sizeof (check) != rc) {
exit (1);
}
for (i = 0 ; i < 4 ; ++i) {
if (check[i] != i) {
exit (1);
}
check[i] = i * 2;
}
rem_iov.iov_base = in;
rc = process_vm_writev (pid, &loc_iov, 1, &rem_iov, 1, 0);
if (sizeof (check) != rc) {
exit (1);
}
exit (0);
}
]],[[
int i, in[4] = {-1, -1, -1, -1}, out[4] = {0, 1, 2, 3};
do_check (getpid (), in, out);
for (i = 0 ; i < 4 ; ++i) {
if (in[i] != 2 * i) {
return 1;
}
}
/* all good */
return 0;
]])],
[AC_MSG_RESULT([yes])
opal_check_cma_happy=1],
[AC_MSG_RESULT([no])
opal_check_cma_happy=0],
[AC_MSG_RESULT([no (cross-compiling)])
opal_check_cma_happy=0])
CFLAGS=$opal_check_cma_CFLAGS
else
# If we didn't need the defs, then we have process_vm_readv(),
# and CMA is happy.
opal_check_cma_happy=1
fi
OPAL_VAR_SCOPE_POP
# Testing CAP_SYS_PTRACE between two processes with kcmp
AC_CHECK_HEADERS([linux/kcmp.h])
AC_CHECK_HEADERS([sys/syscall.h])
AC_MSG_CHECKING([if kcmp works])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <linux/kcmp.h>
#include <sys/syscall.h>
#include <unistd.h>
]], [[
syscall(SYS_kcmp, 123, 456, KCMP_VM, 0, 0);
]])],
[AC_MSG_RESULT([yes])
opal_check_cma_kcmp_happy=1],
[AC_MSG_RESULT([no])
opal_check_cma_kcmp_happy=0])
AC_DEFINE_UNQUOTED([OPAL_CMA_KCMP_AVAIL],
[$opal_check_cma_kcmp_happy],
[If kcmp is available])
AS_IF([test $opal_check_cma_happy -eq 1],
[opal_check_cma_msg=yes],
[opal_check_cma_msg=no])
OPAL_SUMMARY_ADD([Transports], [Shared memory/Linux CMA], [], [$opal_check_cma_msg])
])
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