summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
blob: f3a8933c12755f9593c1207a9d13d3d6a0d7999d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

SYSFS=

prerequisite()
{
	msg="skip all tests:"

	if [ $UID != 0 ]; then
		echo $msg must be run as root >&2
		exit 0
	fi

	taskset -p 01 $$

	SYSFS=`mount -t sysfs | head -1 | awk '{ print $3 }'`

	if [ ! -d "$SYSFS" ]; then
		echo $msg sysfs is not mounted >&2
		exit 0
	fi

	if ! ls $SYSFS/devices/system/cpu/cpu* > /dev/null 2>&1; then
		echo $msg cpu hotplug is not supported >&2
		exit 0
	fi

	echo "CPU online/offline summary:"
	online_cpus=`cat $SYSFS/devices/system/cpu/online`
	online_max=${online_cpus##*-}

	if [[ "$online_cpus" = "$online_max" ]]; then
		echo "$msg: since there is only one cpu: $online_cpus"
		exit 0
	fi

	echo -e "\t Cpus in online state: $online_cpus"

	offline_cpus=`cat $SYSFS/devices/system/cpu/offline`
	if [[ "a$offline_cpus" = "a" ]]; then
		offline_cpus=0
	else
		offline_max=${offline_cpus##*-}
	fi
	echo -e "\t Cpus in offline state: $offline_cpus"
}

#
# list all hot-pluggable CPUs
#
hotpluggable_cpus()
{
	local state=${1:-.\*}

	for cpu in $SYSFS/devices/system/cpu/cpu*; do
		if [ -f $cpu/online ] && grep -q $state $cpu/online; then
			echo ${cpu##/*/cpu}
		fi
	done
}

hotplaggable_offline_cpus()
{
	hotpluggable_cpus 0
}

hotpluggable_online_cpus()
{
	hotpluggable_cpus 1
}

cpu_is_online()
{
	grep -q 1 $SYSFS/devices/system/cpu/cpu$1/online
}

cpu_is_offline()
{
	grep -q 0 $SYSFS/devices/system/cpu/cpu$1/online
}

online_cpu()
{
	echo 1 > $SYSFS/devices/system/cpu/cpu$1/online
}

offline_cpu()
{
	echo 0 > $SYSFS/devices/system/cpu/cpu$1/online
}

online_cpu_expect_success()
{
	local cpu=$1

	if ! online_cpu $cpu; then
		echo $FUNCNAME $cpu: unexpected fail >&2
		exit 1
	elif ! cpu_is_online $cpu; then
		echo $FUNCNAME $cpu: unexpected offline >&2
		exit 1
	fi
}

online_cpu_expect_fail()
{
	local cpu=$1

	if online_cpu $cpu 2> /dev/null; then
		echo $FUNCNAME $cpu: unexpected success >&2
		exit 1
	elif ! cpu_is_offline $cpu; then
		echo $FUNCNAME $cpu: unexpected online >&2
		exit 1
	fi
}

offline_cpu_expect_success()
{
	local cpu=$1

	if ! offline_cpu $cpu; then
		echo $FUNCNAME $cpu: unexpected fail >&2
		exit 1
	elif ! cpu_is_offline $cpu; then
		echo $FUNCNAME $cpu: unexpected offline >&2
		exit 1
	fi
}

offline_cpu_expect_fail()
{
	local cpu=$1

	if offline_cpu $cpu 2> /dev/null; then
		echo $FUNCNAME $cpu: unexpected success >&2
		exit 1
	elif ! cpu_is_online $cpu; then
		echo $FUNCNAME $cpu: unexpected offline >&2
		exit 1
	fi
}

error=-12
allcpus=0
priority=0
online_cpus=0
online_max=0
offline_cpus=0
offline_max=0

while getopts e:ahp: opt; do
	case $opt in
	e)
		error=$OPTARG
		;;
	a)
		allcpus=1
		;;
	h)
		echo "Usage $0 [ -a ] [ -e errno ] [ -p notifier-priority ]"
		echo -e "\t default offline one cpu"
		echo -e "\t run with -a option to offline all cpus"
		exit
		;;
	p)
		priority=$OPTARG
		;;
	esac
done

if ! [ "$error" -ge -4095 -a "$error" -lt 0 ]; then
	echo "error code must be -4095 <= errno < 0" >&2
	exit 1
fi

prerequisite

#
# Safe test (default) - offline and online one cpu
#
if [ $allcpus -eq 0 ]; then
	echo "Limited scope test: one hotplug cpu"
	echo -e "\t (leaves cpu in the original state):"
	echo -e "\t online to offline to online: cpu $online_max"
	offline_cpu_expect_success $online_max
	online_cpu_expect_success $online_max

	if [[ $offline_cpus -gt 0 ]]; then
		echo -e "\t offline to online to offline: cpu $offline_max"
		online_cpu_expect_success $offline_max
		offline_cpu_expect_success $offline_max
	fi
	exit 0
else
	echo "Full scope test: all hotplug cpus"
	echo -e "\t online all offline cpus"
	echo -e "\t offline all online cpus"
	echo -e "\t online all offline cpus"
fi

#
# Online all hot-pluggable CPUs
#
for cpu in `hotplaggable_offline_cpus`; do
	online_cpu_expect_success $cpu
done

#
# Offline all hot-pluggable CPUs
#
for cpu in `hotpluggable_online_cpus`; do
	offline_cpu_expect_success $cpu
done

#
# Online all hot-pluggable CPUs again
#
for cpu in `hotplaggable_offline_cpus`; do
	online_cpu_expect_success $cpu
done

#
# Test with cpu notifier error injection
#

DEBUGFS=`mount -t debugfs | head -1 | awk '{ print $3 }'`
NOTIFIER_ERR_INJECT_DIR=$DEBUGFS/notifier-error-inject/cpu

prerequisite_extra()
{
	msg="skip extra tests:"

	/sbin/modprobe -q -r cpu-notifier-error-inject
	/sbin/modprobe -q cpu-notifier-error-inject priority=$priority

	if [ ! -d "$DEBUGFS" ]; then
		echo $msg debugfs is not mounted >&2
		exit 0
	fi

	if [ ! -d $NOTIFIER_ERR_INJECT_DIR ]; then
		echo $msg cpu-notifier-error-inject module is not available >&2
		exit 0
	fi
}

prerequisite_extra

#
# Offline all hot-pluggable CPUs
#
echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error
for cpu in `hotpluggable_online_cpus`; do
	offline_cpu_expect_success $cpu
done

#
# Test CPU hot-add error handling (offline => online)
#
echo $error > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_UP_PREPARE/error
for cpu in `hotplaggable_offline_cpus`; do
	online_cpu_expect_fail $cpu
done

#
# Online all hot-pluggable CPUs
#
echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_UP_PREPARE/error
for cpu in `hotplaggable_offline_cpus`; do
	online_cpu_expect_success $cpu
done

#
# Test CPU hot-remove error handling (online => offline)
#
echo $error > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error
for cpu in `hotpluggable_online_cpus`; do
	offline_cpu_expect_fail $cpu
done

echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error
/sbin/modprobe -q -r cpu-notifier-error-inject