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-rw-r--r--tools/testing/selftests/powerpc/eeh/Makefile9
-rwxr-xr-xtools/testing/selftests/powerpc/eeh/eeh-basic.sh57
-rw-r--r--tools/testing/selftests/powerpc/eeh/eeh-functions.sh245
-rwxr-xr-xtools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh45
-rwxr-xr-xtools/testing/selftests/powerpc/eeh/eeh-vf-unaware.sh35
-rw-r--r--tools/testing/selftests/powerpc/eeh/settings1
6 files changed, 392 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/eeh/Makefile b/tools/testing/selftests/powerpc/eeh/Makefile
new file mode 100644
index 000000000..ae963eb2d
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+noarg:
+ $(MAKE) -C ../
+
+TEST_PROGS := eeh-basic.sh
+TEST_FILES := eeh-functions.sh settings
+
+top_srcdir = ../../../../..
+include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-basic.sh b/tools/testing/selftests/powerpc/eeh/eeh-basic.sh
new file mode 100755
index 000000000..442b666cc
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/eeh-basic.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+. ./eeh-functions.sh
+
+eeh_test_prep # NB: may exit
+
+pre_lspci=`mktemp`
+lspci > $pre_lspci
+
+# record the devices that we break in here. Assuming everything
+# goes to plan we should get them back once the recover process
+# is finished.
+devices=""
+
+# Build up a list of candidate devices.
+for dev in `ls -1 /sys/bus/pci/devices/ | grep '\.0$'` ; do
+ if ! eeh_can_break $dev ; then
+ continue;
+ fi
+
+ # Skip VFs for now since we don't have a reliable way to break them.
+ if [ -e "/sys/bus/pci/devices/$dev/physfn" ] ; then
+ echo "$dev, Skipped: virtfn"
+ continue;
+ fi
+
+ echo "$dev, Added"
+
+ # Add to this list of device to check
+ devices="$devices $dev"
+done
+
+dev_count="$(echo $devices | wc -w)"
+echo "Found ${dev_count} breakable devices..."
+
+failed=0
+for dev in $devices ; do
+ echo "Breaking $dev..."
+
+ if ! pe_ok $dev ; then
+ echo "Skipping $dev, Initial PE state is not ok"
+ failed="$((failed + 1))"
+ continue;
+ fi
+
+ if ! eeh_one_dev $dev ; then
+ failed="$((failed + 1))"
+ fi
+done
+
+echo "$failed devices failed to recover ($dev_count tested)"
+lspci | diff -u $pre_lspci -
+rm -f $pre_lspci
+
+test "$failed" -eq 0
+exit $?
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-functions.sh b/tools/testing/selftests/powerpc/eeh/eeh-functions.sh
new file mode 100644
index 000000000..70daa3925
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/eeh-functions.sh
@@ -0,0 +1,245 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+export KSELFTESTS_SKIP=4
+
+log() {
+ echo >/dev/stderr $*
+}
+
+pe_ok() {
+ local dev="$1"
+ local path="/sys/bus/pci/devices/$dev/eeh_pe_state"
+
+ # if a driver doesn't support the error handling callbacks then the
+ # device is recovered by removing and re-probing it. This causes the
+ # sysfs directory to disappear so read the PE state once and squash
+ # any potential error messages
+ local eeh_state="$(cat $path 2>/dev/null)"
+ if [ -z "$eeh_state" ]; then
+ return 1;
+ fi
+
+ local fw_state="$(echo $eeh_state | cut -d' ' -f1)"
+ local sw_state="$(echo $eeh_state | cut -d' ' -f2)"
+
+ # If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an
+ # error state or being recovered. Either way, not ok.
+ if [ "$((sw_state & 0x3))" -ne 0 ] ; then
+ return 1
+ fi
+
+ # A functioning PE should have the EEH_STATE_MMIO_ACTIVE and
+ # EEH_STATE_DMA_ACTIVE flags set. For some goddamn stupid reason
+ # the platform backends set these when the PE is in reset. The
+ # RECOVERING check above should stop any false positives though.
+ if [ "$((fw_state & 0x18))" -ne "$((0x18))" ] ; then
+ return 1
+ fi
+
+ return 0;
+}
+
+eeh_supported() {
+ test -e /proc/powerpc/eeh && \
+ grep -q 'EEH Subsystem is enabled' /proc/powerpc/eeh
+}
+
+eeh_test_prep() {
+ if ! eeh_supported ; then
+ echo "EEH not supported on this system, skipping"
+ exit $KSELFTESTS_SKIP;
+ fi
+
+ if [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_check" ] && \
+ [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_break" ] ; then
+ log "debugfs EEH testing files are missing. Is debugfs mounted?"
+ exit $KSELFTESTS_SKIP;
+ fi
+
+ # Bump the max freeze count to something absurd so we don't
+ # trip over it while breaking things.
+ echo 5000 > /sys/kernel/debug/powerpc/eeh_max_freezes
+}
+
+eeh_can_break() {
+ # skip bridges since we can't recover them (yet...)
+ if [ -e "/sys/bus/pci/devices/$dev/pci_bus" ] ; then
+ log "$dev, Skipped: bridge"
+ return 1;
+ fi
+
+ # The ahci driver doesn't support error recovery. If the ahci device
+ # happens to be hosting the root filesystem, and then we go and break
+ # it the system will generally go down. We should probably fix that
+ # at some point
+ if [ "ahci" = "$(basename $(realpath /sys/bus/pci/devices/$dev/driver))" ] ; then
+ log "$dev, Skipped: ahci doesn't support recovery"
+ return 1;
+ fi
+
+ # Don't inject errosr into an already-frozen PE. This happens with
+ # PEs that contain multiple PCI devices (e.g. multi-function cards)
+ # and injecting new errors during the recovery process will probably
+ # result in the recovery failing and the device being marked as
+ # failed.
+ if ! pe_ok $dev ; then
+ log "$dev, Skipped: Bad initial PE state"
+ return 1;
+ fi
+
+ return 0
+}
+
+eeh_one_dev() {
+ local dev="$1"
+
+ # Using this function from the command line is sometimes useful for
+ # testing so check that the argument is a well-formed sysfs device
+ # name.
+ if ! test -e /sys/bus/pci/devices/$dev/ ; then
+ log "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
+ return 1;
+ fi
+
+ # Break it
+ echo $dev >/sys/kernel/debug/powerpc/eeh_dev_break
+
+ # Force an EEH device check. If the kernel has already
+ # noticed the EEH (due to a driver poll or whatever), this
+ # is a no-op.
+ echo $dev >/sys/kernel/debug/powerpc/eeh_dev_check
+
+ # Default to a 60s timeout when waiting for a device to recover. This
+ # is an arbitrary default which can be overridden by setting the
+ # EEH_MAX_WAIT environmental variable when required.
+
+ # The current record holder for longest recovery time is:
+ # "Adaptec Series 8 12G SAS/PCIe 3" at 39 seconds
+ max_wait=${EEH_MAX_WAIT:=60}
+
+ for i in `seq 0 ${max_wait}` ; do
+ if pe_ok $dev ; then
+ break;
+ fi
+ log "$dev, waited $i/${max_wait}"
+ sleep 1
+ done
+
+ if ! pe_ok $dev ; then
+ log "$dev, Failed to recover!"
+ return 1;
+ fi
+
+ log "$dev, Recovered after $i seconds"
+ return 0;
+}
+
+eeh_has_driver() {
+ test -e /sys/bus/pci/devices/$1/driver;
+ return $?
+}
+
+eeh_can_recover() {
+ # we'll get an IO error if the device's current driver doesn't support
+ # error recovery
+ echo $1 > '/sys/kernel/debug/powerpc/eeh_dev_can_recover' 2>/dev/null
+
+ return $?
+}
+
+eeh_find_all_pfs() {
+ devices=""
+
+ # SR-IOV on pseries requires hypervisor support, so check for that
+ is_pseries=""
+ if grep -q pSeries /proc/cpuinfo ; then
+ if [ ! -f /proc/device-tree/rtas/ibm,open-sriov-allow-unfreeze ] ||
+ [ ! -f /proc/device-tree/rtas/ibm,open-sriov-map-pe-number ] ; then
+ return 1;
+ fi
+
+ is_pseries="true"
+ fi
+
+ for dev in `ls -1 /sys/bus/pci/devices/` ; do
+ sysfs="/sys/bus/pci/devices/$dev"
+ if [ ! -e "$sysfs/sriov_numvfs" ] ; then
+ continue
+ fi
+
+ # skip unsupported PFs on pseries
+ if [ -z "$is_pseries" ] &&
+ [ ! -f "$sysfs/of_node/ibm,is-open-sriov-pf" ] &&
+ [ ! -f "$sysfs/of_node/ibm,open-sriov-vf-bar-info" ] ; then
+ continue;
+ fi
+
+ # no driver, no vfs
+ if ! eeh_has_driver $dev ; then
+ continue
+ fi
+
+ devices="$devices $dev"
+ done
+
+ if [ -z "$devices" ] ; then
+ return 1;
+ fi
+
+ echo $devices
+ return 0;
+}
+
+# attempts to enable one VF on each PF so we can do VF specific tests.
+# stdout: list of enabled VFs, one per line
+# return code: 0 if vfs are found, 1 otherwise
+eeh_enable_vfs() {
+ pf_list="$(eeh_find_all_pfs)"
+
+ vfs=0
+ for dev in $pf_list ; do
+ pf_sysfs="/sys/bus/pci/devices/$dev"
+
+ # make sure we have a single VF
+ echo 0 > "$pf_sysfs/sriov_numvfs"
+ echo 1 > "$pf_sysfs/sriov_numvfs"
+ if [ "$?" != 0 ] ; then
+ log "Unable to enable VFs on $pf, skipping"
+ continue;
+ fi
+
+ vf="$(basename $(realpath "$pf_sysfs/virtfn0"))"
+ if [ $? != 0 ] ; then
+ log "unable to find enabled vf on $pf"
+ echo 0 > "$pf_sysfs/sriov_numvfs"
+ continue;
+ fi
+
+ if ! eeh_can_break $vf ; then
+ log "skipping "
+
+ echo 0 > "$pf_sysfs/sriov_numvfs"
+ continue;
+ fi
+
+ vfs="$((vfs + 1))"
+ echo $vf
+ done
+
+ test "$vfs" != 0
+ return $?
+}
+
+eeh_disable_vfs() {
+ pf_list="$(eeh_find_all_pfs)"
+ if [ -z "$pf_list" ] ; then
+ return 1;
+ fi
+
+ for dev in $pf_list ; do
+ echo 0 > "/sys/bus/pci/devices/$dev/sriov_numvfs"
+ done
+
+ return 0;
+}
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh b/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh
new file mode 100755
index 000000000..874c11953
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/eeh-vf-aware.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+. ./eeh-functions.sh
+
+eeh_test_prep # NB: may exit
+
+vf_list="$(eeh_enable_vfs)";
+if $? != 0 ; then
+ log "No usable VFs found. Skipping EEH unaware VF test"
+ exit $KSELFTESTS_SKIP;
+fi
+
+log "Enabled VFs: $vf_list"
+
+tested=0
+passed=0
+for vf in $vf_list ; do
+ log "Testing $vf"
+
+ if ! eeh_can_recover $vf ; then
+ log "Driver for $vf doesn't support error recovery, skipping"
+ continue;
+ fi
+
+ tested="$((tested + 1))"
+
+ log "Breaking $vf..."
+ if ! eeh_one_dev $vf ; then
+ log "$vf failed to recover"
+ continue;
+ fi
+
+ passed="$((passed + 1))"
+done
+
+eeh_disable_vfs
+
+if [ "$tested" == 0 ] ; then
+ echo "No VFs with EEH aware drivers found, skipping"
+ exit $KSELFTESTS_SKIP
+fi
+
+test "$failed" != 0
+exit $?;
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-vf-unaware.sh b/tools/testing/selftests/powerpc/eeh/eeh-vf-unaware.sh
new file mode 100755
index 000000000..8a4c147b9
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/eeh-vf-unaware.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+. ./eeh-functions.sh
+
+eeh_test_prep # NB: may exit
+
+vf_list="$(eeh_enable_vfs)";
+if $? != 0 ; then
+ log "No usable VFs found. Skipping EEH unaware VF test"
+ exit $KSELFTESTS_SKIP;
+fi
+
+log "Enabled VFs: $vf_list"
+
+failed=0
+for vf in $vf_list ; do
+ log "Testing $vf"
+
+ if eeh_can_recover $vf ; then
+ log "Driver for $vf supports error recovery. Unbinding..."
+ echo "$vf" > /sys/bus/pci/devices/$vf/driver/unbind
+ fi
+
+ log "Breaking $vf..."
+ if ! eeh_one_dev $vf ; then
+ log "$vf failed to recover"
+ failed="$((failed + 1))"
+ fi
+done
+
+eeh_disable_vfs
+
+test "$failed" != 0
+exit $?;
diff --git a/tools/testing/selftests/powerpc/eeh/settings b/tools/testing/selftests/powerpc/eeh/settings
new file mode 100644
index 000000000..694d70710
--- /dev/null
+++ b/tools/testing/selftests/powerpc/eeh/settings
@@ -0,0 +1 @@
+timeout=300