NTB: ntb_test: add parameter for doorbell bitmask

If the test attempts to clear doorbell bits that are invalid for the
hardware, then the test will fail. Provide a parameter to specify the
doorbell bits to clear. Set default doorbell bits that work for XEON.

Signed-off-by: Allen Hubbe <[e-mail]>
Acked-by: Logan Gunthorpe <[e-mail]>
Signed-off-by: Jon Mason <[e-mail]>

tools/testing/selftests/ntb/ntb_test.sh

···
 
 DEBUGFS=${DEBUGFS-/sys/kernel/debug}
 
+DB_BITMASK=0x7FFF
 PERF_RUN_ORDER=32
 MAX_MW_SIZE=0
 RUN_DMA_TESTS=
···
 	echo "be highly recommended."
 	echo
 	echo "Options:"
+	echo "  -b BITMASK      doorbell clear bitmask for ntb_tool"
 	echo "  -C              don't cleanup ntb modules on exit"
 	echo "  -d              run dma tests"
 	echo "  -h              show this help message"
···
 function parse_args()
 {
 	OPTIND=0
-	while getopts "Cdhlm:r:p:w:" opt; do
+	while getopts "b:Cdhlm:r:p:w:" opt; do
 		case "$opt" in
+		b)  DB_BITMASK=${OPTARG} ;;
 		C)  DONT_CLEANUP=1 ;;
 		d)  RUN_DMA_TESTS=1 ;;
 		h)  show_help; exit 0 ;;
···
 
 	echo "Running db tests on: $(basename $LOC) / $(basename $REM)"
 
-	write_file "c 0xFFFFFFFF" "$REM/db"
+	write_file "c $DB_BITMASK" "$REM/db"
 
 	for ((i=1; i <= 8; i++)); do
 		let DB=$(read_file "$REM/db") || true