fio: fix s390 timing for older machines/binutils
Older gcc/binutils or one with very low default march will refuse to use stckf.
On top of that machines older than a z196 don not even have the store clock
fast facility.
To fix all of those issues, check for the facilities in configure step and make
the usage of stckf and a matching march dependent to it.
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/configure b/configure
index 05f985b..4757d67 100755
--- a/configure
+++ b/configure
@@ -1181,6 +1181,36 @@
fi
echo "setvbuf $setvbuf"
+##########################################
+# Check if we support stckf on s390
+s390_z196_facilities="no"
+cat > $TMPC << EOF
+#define STFLE_BITS_Z196 45 /* various z196 facilities ... */
+int main(int argc, char **argv)
+{
+ /* We want just 1 double word to be returned. */
+ register unsigned long reg0 asm("0") = 0;
+ unsigned long stfle_bits;
+ asm volatile(".machine push" "\n\t"
+ ".machine \"z9-109\"" "\n\t"
+ "stfle %0" "\n\t"
+ ".machine pop" "\n"
+ : "=QS" (stfle_bits), "+d" (reg0)
+ : : "cc");
+
+ if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z196))) != 0)
+ return 0;
+ else
+ return -1;
+}
+EOF
+if compile_prog "" "" "s390_z196_facilities"; then
+ $TMPE
+ if [[ $? -eq 0 ]]; then
+ s390_z196_facilities="yes"
+ fi
+fi
+echo "s390_z196_facilities $s390_z196_facilities"
#############################################################################
if test "$wordsize" = "64" ; then
@@ -1311,6 +1341,10 @@
if test "$setvbuf" = "yes" ; then
output_sym "CONFIG_SETVBUF"
fi
+if test "$s390_z196_facilities" = "yes" ; then
+ output_sym "CONFIG_S390_Z196_FACILITIES"
+ CFLAGS="$CFLAGS -march=z9-109"
+fi
echo "LIBS+=$LIBS" >> $config_host_mak
echo "CFLAGS+=$CFLAGS" >> $config_host_mak