# -*- 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) 2010-2012 IBM Corporation. All rights reserved. # Copyright (c) 2013-2016 Los Alamos National Security, LLC. 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], [AC_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${srcdir}/opal/include" AC_MSG_CHECKING([if internal syscall numbers for Linux CMA work]) AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include #include #include #include #include #include #include #include "opal/include/opal/sys/cma.h" static void do_check (pid_t pid, int *in, int *out) { int check[4] = {0, 0, 0, 0}, i; struct iovec rem_iov = {out, sizeof (check)}; struct iovec loc_iov = {check, sizeof (check)}; ssize_t rc; rc = process_vm_readv (pid, &loc_iov, 1, &rem_iov, 1, 0); if (sizeof (check) != rc) { exit (1); } for (i = 0 ; i < 4 ; ++i) { if (check[i] != i) { exit (1); } check[i] = i * 2; } rem_iov.iov_base = in; rc = process_vm_writev (pid, &loc_iov, 1, &rem_iov, 1, 0); if (sizeof (check) != rc) { exit (1); } exit (0); } ]],[[ int i, in[4] = {-1, -1, -1, -1}, out[4] = {0, 1, 2, 3}; do_check (getpid (), in, out); for (i = 0 ; i < 4 ; ++i) { if (in[i] != 2 * i) { return 1; } } /* all good */ return 0; ]])], [AC_MSG_RESULT([yes]) opal_check_cma_happy=1], [AC_MSG_RESULT([no]) opal_check_cma_happy=0], [AC_MSG_RESULT([no (cross-compiling)]) opal_check_cma_happy=0]) CFLAGS=$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 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]],[$1],[$opal_check_cma_msg]) ])