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/eeh_pe_state"
13
14 # if a driver doesn't support the error handling callbacks then the
15 # device is recovered by removing and re-probing it. This causes the
16 # sysfs directory to disappear so read the PE state once and squash
17 # any potential error messages
18 local eeh_state="$(cat $path 2>/dev/null)"
19 if [ -z "$eeh_state" ]; then
20 return 1;
21 fi
22
23 local fw_state="$(echo $eeh_state | cut -d' ' -f1)"
24 local sw_state="$(echo $eeh_state | cut -d' ' -f2)"
25
26 # If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an
27 # error state or being recovered. Either way, not ok.
28 if [ "$((sw_state & 0x3))" -ne 0 ] ; then
29 return 1
30 fi
31
32 # A functioning PE should have the EEH_STATE_MMIO_ACTIVE and
33 # EEH_STATE_DMA_ACTIVE flags set. For some goddamn stupid reason
34 # the platform backends set these when the PE is in reset. The
35 # RECOVERING check above should stop any false positives though.
36 if [ "$((fw_state & 0x18))" -ne "$((0x18))" ] ; then
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' /proc/powerpc/eeh
46 }
47
48 eeh_test_prep() {
49 if ! eeh_supported ; then
50 echo "EEH not supported on this system, skipping"
51 exit $KSELFTESTS_SKIP;
52 fi
53
54 if [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_check" ] && \
55 [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_break" ] ; then
56 log "debugfs EEH testing files are missing. Is debugfs mounted?"
57 exit $KSELFTESTS_SKIP;
58 fi
59
60 # Bump the max freeze count to something absurd so we don't
61 # trip over it while breaking things.
62 echo 5000 > /sys/kernel/debug/powerpc/eeh_max_freezes
63 }
64
65 eeh_can_break() {
66 # skip bridges since we can't recover them (yet...)
67 if [ -e "/sys/bus/pci/devices/$dev/pci_bus" ] ; then
68 log "$dev, Skipped: bridge"
69 return 1;
70 fi
71
72 # The ahci driver doesn't support error recovery. If the ahci device
73 # happens to be hosting the root filesystem, and then we go and break
74 # it the system will generally go down. We should probably fix that
75 # at some point
76 if [ "ahci" = "$(basename $(realpath /sys/bus/pci/devices/$dev/driver))" ] ; then
77 log "$dev, Skipped: ahci doesn't support recovery"
78 return 1;
79 fi
80
81 # Don't inject errosr into an already-frozen PE. This happens with
82 # PEs that contain multiple PCI devices (e.g. multi-function cards)
83 # and injecting new errors during the recovery process will probably
84 # result in the recovery failing and the device being marked as
85 # failed.
86 if ! pe_ok $dev ; then
87 log "$dev, Skipped: Bad initial PE state"
88 return 1;
89 fi
90
91 return 0
92 }
93
94 eeh_one_dev() {
95 local dev="$1"
96
97 # Using this function from the command line is sometimes useful for
98 # testing so check that the argument is a well-formed sysfs device
99 # name.
100 if ! test -e /sys/bus/pci/devices/$dev/ ; then
101 log "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
102 return 1;
103 fi
104
105 # Break it
106 echo $dev >/sys/kernel/debug/powerpc/eeh_dev_break
107
108 # Force an EEH device check. If the kernel has already
109 # noticed the EEH (due to a driver poll or whatever), this
110 # is a no-op.
111 echo $dev >/sys/kernel/debug/powerpc/eeh_dev_check
112
113 # Default to a 60s timeout when waiting for a device to recover. This
114 # is an arbitrary default which can be overridden by setting the
115 # EEH_MAX_WAIT environmental variable when required.
116
117 # The current record holder for longest recovery time is:
118 # "Adaptec Series 8 12G SAS/PCIe 3" at 39 seconds
119 max_wait=${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_wait}"
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's current driver doesn't support
145 # error recovery
146 echo $1 > '/sys/kernel/debug/powerpc/eeh_dev_can_recover' 2>/dev/null
147
148 return $?
149 }
150
151 eeh_find_all_pfs() {
152 devices=""
153
154 # SR-IOV on pseries requires hypervisor support, so check for that
155 is_pseries=""
156 if grep -q pSeries /proc/cpuinfo ; then
157 if [ ! -f /proc/device-tree/rtas/ibm,open-sriov-allow-unfreeze ] ||
158 [ ! -f /proc/device-tree/rtas/ibm,open-sriov-map-pe-number ] ; then
159 return 1;
160 fi
161
162 is_pseries="true"
163 fi
164
165 for dev in `ls -1 /sys/bus/pci/devices/` ; do
166 sysfs="/sys/bus/pci/devices/$dev"
167 if [ ! -e "$sysfs/sriov_numvfs" ] ; then
168 continue
169 fi
170
171 # skip unsupported PFs on pseries
172 if [ -z "$is_pseries" ] &&
173 [ ! -f "$sysfs/of_node/ibm,is-open-sriov-pf" ] &&
174 [ ! -f "$sysfs/of_node/ibm,open-sriov-vf-bar-info" ] ; then
175 continue;
176 fi
177
178 # no driver, no vfs
179 if ! eeh_has_driver $dev ; then
180 continue
181 fi
182
183 devices="$devices $dev"
184 done
185
186 if [ -z "$devices" ] ; then
187 return 1;
188 fi
189
190 echo $devices
191 return 0;
192 }
193
194 # attempts to enable one VF on each PF so we can do VF specific tests.
195 # stdout: list of enabled VFs, one per line
196 # return code: 0 if vfs are found, 1 otherwise
197 eeh_enable_vfs() {
198 pf_list="$(eeh_find_all_pfs)"
199
200 vfs=0
201 for dev in $pf_list ; do
202 pf_sysfs="/sys/bus/pci/devices/$dev"
203
204 # make sure we have a single VF
205 echo 0 > "$pf_sysfs/sriov_numvfs"
206 echo 1 > "$pf_sysfs/sriov_numvfs"
207 if [ "$?" != 0 ] ; then
208 log "Unable to enable VFs on $pf, skipping"
209 continue;
210 fi
211
212 vf="$(basename $(realpath "$pf_sysfs/virtfn0"))"
213 if [ $? != 0 ] ; then
214 log "unable to find enabled vf on $pf"
215 echo 0 > "$pf_sysfs/sriov_numvfs"
216 continue;
217 fi
218
219 if ! eeh_can_break $vf ; then
220 log "skipping "
221
222 echo 0 > "$pf_sysfs/sriov_numvfs"
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 $pf_list ; do
241 echo 0 > "/sys/bus/pci/devices/$dev/sriov_numvfs"
242 done
243
244 return 0;
245 }
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