From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 4 Oct 2021 17:35:44 +0000 (-0700)
Subject: tests/scsi/007: Add a test that triggers the SCSI error handler
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=449c0392b484264647a33732c29f542b46dbfe0d;p=users%2Fhch%2Fblktests.git

tests/scsi/007: Add a test that triggers the SCSI error handler

Since none of the existing tests guarantee that the SCSI error handler
will be triggered, add a test that guarantees this.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---

diff --git a/tests/scsi/007 b/tests/scsi/007
new file mode 100755
index 0000000..002bf4a
--- /dev/null
+++ b/tests/scsi/007
@@ -0,0 +1,62 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright 2021 Google LLC
+#
+# Trigger the SCSI error handler.
+
+. tests/scsi/rc
+. common/scsi_debug
+
+DESCRIPTION="Trigger the SCSI error handler"
+
+QUICK=1
+
+requires() {
+	_have_scsi_debug
+}
+
+config_hz() {
+	if [ -e /proc/config.gz ]; then
+		zcat /proc/config.gz
+	else
+		cat "/boot/config-$(uname -r)"
+	fi | sed -n 's/^CONFIG_HZ=//p'
+}
+
+test() {
+	local dev freq delay_s jdelay
+
+	echo "Running ${TEST_NAME}"
+
+	if ! _init_scsi_debug; then
+		return 1
+	fi
+
+	# Enable SCSI error handler logging
+	echo 63 > /sys/module/scsi_mod/parameters/scsi_logging_level
+
+	dev="${SCSI_DEBUG_DEVICES[0]}"
+	# Change the block layer timeout to max(1 / CONFIG_HZ, 0.001)
+	# seconds.
+	echo 1 > "/sys/class/block/$dev/queue/io_timeout"
+	echo "I/O timeout = $(<"/sys/class/block/$dev/queue/io_timeout")" >>"$FULL"
+        # Change the scsi_debug delay to 3 seconds.
+	delay_s=3
+        freq=$(config_hz)
+        jdelay=$((delay_s * "${freq}"))
+        echo "CONFIG_HZ=${freq} jdelay=${jdelay}" >>"$FULL"
+	echo "$jdelay" > /sys/module/scsi_debug/parameters/delay
+	if dd if="/dev/$dev" of=/dev/null bs=512 count=1 \
+	      iflag=direct >&/dev/null; then
+		echo "Reading from scsi_debug succeeded"
+	else
+		echo "Reading from scsi_debug failed"
+	fi
+
+	# Disable SCSI error handler logging
+	echo 0 > /sys/module/scsi_mod/parameters/scsi_logging_level
+
+	_exit_scsi_debug
+
+	echo "Test complete"
+}
diff --git a/tests/scsi/007.out b/tests/scsi/007.out
new file mode 100644
index 0000000..716676a
--- /dev/null
+++ b/tests/scsi/007.out
@@ -0,0 +1,3 @@
+Running scsi/007
+Reading from scsi_debug failed
+Test complete