Modify nvme module parameter write_queues to change hardware
queue count, then reset nvme controller to reinitialize nvme
with different queue count.
Attention, this test case may trigger a kernel panic.
Signed-off-by: Weiping Zhang <zhangweiping@xxxxxxxxxxxxxx>
---
tests/nvme/033 | 87 ++++++++++++++++++++++++++++++++++++++++++++++
tests/nvme/033.out | 2 ++
2 files changed, 89 insertions(+)
create mode 100755 tests/nvme/033
create mode 100644 tests/nvme/033.out
diff --git a/tests/nvme/033 b/tests/nvme/033
new file mode 100755
index 0000000..e3b9211
--- /dev/null
+++ b/tests/nvme/033
@@ -0,0 +1,87 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2020 Weiping Zhang <zwp10758@xxxxxxxxx>
+#
+# Test nvme update hardware queue count larger than system cpu count
+#
+
+. tests/nvme/rc
+
+DESCRIPTION="test nvme update hardware queue count larger than system cpu count"
+QUICK=1
+
+requires() {
+ _have_program dd
+}
+
+device_requires() {
+ _test_dev_is_nvme
+}
+
+test_device() {
+ echo "Running ${TEST_NAME}"
+
+ local old_write_queues
+ local cur_hw_io_queues
+ local file
+ local sys_dev=$TEST_DEV_SYSFS/device
+
+ # backup old module parameter: write_queues
+ file=/sys/module/nvme/parameters/write_queues
+ if [[ ! -e "$file" ]]; then
+ echo "$file does not exist"
+ return 1
+ fi
+ old_write_queues="$(cat $file)"
+
+ # get current hardware queue count
+ file="$sys_dev/queue_count"
+ if [[ ! -e "$file" ]]; then
+ echo "$file does not exist"
+ return 1
+ fi
+ cur_hw_io_queues="$(cat "$file")"
+ # minus admin queue
+ cur_hw_io_queues=$((cur_hw_io_queues - 1))
+
+ # set write queues count to increase more hardware queues
+ file=/sys/module/nvme/parameters/write_queues
+ echo "$cur_hw_io_queues" > "$file"
+
+ # reset controller, make it effective
+ file="$sys_dev/reset_controller"
+ if [[ ! -e "$file" ]]; then
+ echo "$file does not exist"
+ return 1
+ fi
+ echo 1 > "$file"
+
+ # wait nvme reinitialized
+ for ((m = 0; m < 10; m++)); do
+ if [[ -b "${TEST_DEV}" ]]; then
+ break
+ fi
+ sleep 0.5
+ done
+ if (( m > 9 )); then
+ echo "nvme still not reinitialized after 5 seconds!"
+ return 1
+ fi
+
+ # read data from device (may kernel panic)
+ dd if="${TEST_DEV}" of=/dev/null bs=4096 count=1 status=none
+
+ # If all work well restore hardware queue to default
+ file=/sys/module/nvme/parameters/write_queues
+ echo "$old_write_queues" > "$file"
+
+ # reset controller
+ file="$sys_dev/reset_controller"
+ echo 1 > "$file"
+
+ # read data from device (may kernel panic)
+ dd if="${TEST_DEV}" of=/dev/null bs=4096 count=1 iflag=direct status=none
+ dd if=/dev/zero of="${TEST_DEV}" bs=4096 count=1 oflag=direct status=none
+
+ echo "Test complete"
+}
diff --git a/tests/nvme/033.out b/tests/nvme/033.out
new file mode 100644
index 0000000..9648c73
--- /dev/null
+++ b/tests/nvme/033.out
@@ -0,0 +1,2 @@
+Running nvme/033
+Test complete
--
2.18.1
