1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0-only
3
4 export KSELFTESTS_SKIP=4
5
6 log() {
7 echo >/dev/stderr $*
8 }
9
10 pe_ok() {
11 local dev="$1"
12 local path="/sys/bus/pci/devices/$dev/
13
14 # if a driver doesn't support the erro
15 # device is recovered by removing and
16 # sysfs directory to disappear so read
17 # any potential error messages
18 local eeh_state="$(cat $path 2>/dev/nu
19 if [ -z "$eeh_state" ]; then
20 return 1;
21 fi
22
23 local fw_state="$(echo $eeh_state | cu
24 local sw_state="$(echo $eeh_state | cu
25
26 # If EEH_PE_ISOLATED or EEH_PE_RECOVER
27 # error state or being recovered. Eith
28 if [ "$((sw_state & 0x3))" -ne 0 ] ; t
29 return 1
30 fi
31
32 # A functioning PE should have the EEH
33 # EEH_STATE_DMA_ACTIVE flags set. For
34 # the platform backends set these when
35 # RECOVERING check above should stop a
36 if [ "$((fw_state & 0x18))" -ne "$((0x
37 return 1
38 fi
39
40 return 0;
41 }
42
43 eeh_supported() {
44 test -e /proc/powerpc/eeh && \
45 grep -q 'EEH Subsystem is enabled' /pr
46 }
47
48 eeh_test_prep() {
49 if ! eeh_supported ; then
50 echo "EEH not supported on thi
51 exit $KSELFTESTS_SKIP;
52 fi
53
54 if [ ! -e "/sys/kernel/debug/powerpc/e
55 [ ! -e "/sys/kernel/debug/powerpc/e
56 log "debugfs EEH testing files
57 exit $KSELFTESTS_SKIP;
58 fi
59
60 # Bump the max freeze count to somethi
61 # trip over it while breaking things.
62 echo 5000 > /sys/kernel/debug/powerpc/
63 }
64
65 eeh_can_break() {
66 # skip bridges since we can't recover
67 if [ -e "/sys/bus/pci/devices/$dev/pci
68 log "$dev, Skipped: bridge"
69 return 1;
70 fi
71
72 # The ahci driver doesn't support erro
73 # happens to be hosting the root files
74 # it the system will generally go down
75 # at some point
76 if [ "ahci" = "$(basename $(realpath /
77 log "$dev, Skipped: ahci doesn
78 return 1;
79 fi
80
81 # Don't inject errosr into an already-
82 # PEs that contain multiple PCI device
83 # and injecting new errors during the
84 # result in the recovery failing and t
85 # failed.
86 if ! pe_ok $dev ; then
87 log "$dev, Skipped: Bad initia
88 return 1;
89 fi
90
91 return 0
92 }
93
94 eeh_one_dev() {
95 local dev="$1"
96
97 # Using this function from the command
98 # testing so check that the argument i
99 # name.
100 if ! test -e /sys/bus/pci/devices/$dev
101 log "Error: '$dev' must be a s
102 return 1;
103 fi
104
105 # Break it
106 echo $dev >/sys/kernel/debug/powerpc/e
107
108 # Force an EEH device check. If the ke
109 # noticed the EEH (due to a driver pol
110 # is a no-op.
111 echo $dev >/sys/kernel/debug/powerpc/e
112
113 # Default to a 60s timeout when waitin
114 # is an arbitrary default which can be
115 # EEH_MAX_WAIT environmental variable
116
117 # The current record holder for longes
118 # "Adaptec Series 8 12G SAS/PCIe 3" a
119 max_wait=${EEH_MAX_WAIT:=60}
120
121 for i in `seq 0 ${max_wait}` ; do
122 if pe_ok $dev ; then
123 break;
124 fi
125 log "$dev, waited $i/${max_wai
126 sleep 1
127 done
128
129 if ! pe_ok $dev ; then
130 log "$dev, Failed to recover!"
131 return 1;
132 fi
133
134 log "$dev, Recovered after $i seconds"
135 return 0;
136 }
137
138 eeh_has_driver() {
139 test -e /sys/bus/pci/devices/$1/driver
140 return $?
141 }
142
143 eeh_can_recover() {
144 # we'll get an IO error if the device'
145 # error recovery
146 echo $1 > '/sys/kernel/debug/powerpc/e
147
148 return $?
149 }
150
151 eeh_find_all_pfs() {
152 devices=""
153
154 # SR-IOV on pseries requires hyperviso
155 is_pseries=""
156 if grep -q pSeries /proc/cpuinfo ; the
157 if [ ! -f /proc/device-tree/rt
158 [ ! -f /proc/device-tree/rt
159 return 1;
160 fi
161
162 is_pseries="true"
163 fi
164
165 for dev in `ls -1 /sys/bus/pci/devices
166 sysfs="/sys/bus/pci/devices/$d
167 if [ ! -e "$sysfs/sriov_numvfs
168 continue
169 fi
170
171 # skip unsupported PFs on pser
172 if [ -z "$is_pseries" ] &&
173 [ ! -f "$sysfs/of_node/ibm,
174 [ ! -f "$sysfs/of_node/ibm,
175 continue;
176 fi
177
178 # no driver, no vfs
179 if ! eeh_has_driver $dev ; the
180 continue
181 fi
182
183 devices="$devices $dev"
184 done
185
186 if [ -z "$devices" ] ; then
187 return 1;
188 fi
189
190 echo $devices
191 return 0;
192 }
193
194 # attempts to enable one VF on each PF so we c
195 # stdout: list of enabled VFs, one per line
196 # return code: 0 if vfs are found, 1 otherwise
197 eeh_enable_vfs() {
198 pf_list="$(eeh_find_all_pfs)"
199
200 vfs=0
201 for dev in $pf_list ; do
202 pf_sysfs="/sys/bus/pci/devices
203
204 # make sure we have a single V
205 echo 0 > "$pf_sysfs/sriov_numv
206 echo 1 > "$pf_sysfs/sriov_numv
207 if [ "$?" != 0 ] ; then
208 log "Unable to enable
209 continue;
210 fi
211
212 vf="$(basename $(realpath "$pf
213 if [ $? != 0 ] ; then
214 log "unable to find en
215 echo 0 > "$pf_sysfs/sr
216 continue;
217 fi
218
219 if ! eeh_can_break $vf ; then
220 log "skipping "
221
222 echo 0 > "$pf_sysfs/sr
223 continue;
224 fi
225
226 vfs="$((vfs + 1))"
227 echo $vf
228 done
229
230 test "$vfs" != 0
231 return $?
232 }
233
234 eeh_disable_vfs() {
235 pf_list="$(eeh_find_all_pfs)"
236 if [ -z "$pf_list" ] ; then
237 return 1;
238 fi
239
240 for dev in $pf_list ; do
241 echo 0 > "/sys/bus/pci/devices
242 done
243
244 return 0;
245 }
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