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|
summary: Ensure that the GPIO chardev interface works.
details: |
The gpio-chardev interface allows read/write access to specified lines
of GPIO character devices. GPIO chip devices are emulated using the
gpio-sim module where they are setup early in boot.
# Kernels on Ubuntu Core <24 does not contain the gpio-sim module and test
# snap is not built for arm.
systems: [-ubuntu-core-18-*, -ubuntu-core-20-*, -ubuntu-core-22-*, -ubuntu-core-*-arm-*]
prepare: |
# emulate GPIO chips using gpio-sim module
cat << EOF > /etc/systemd/system/gpio-sim.service
[Unit]
Description=Emulate gpio chips early in boot
After=sysinit.target
Wants=sysinit.target
[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=$PWD/mk-sim-chips.sh
ExecStop=$PWD/rm-sim-chips.sh
[Install]
WantedBy=multi-user.target
EOF
tests.cleanup defer rm /etc/systemd/system/gpio-sim.service
systemctl enable --now gpio-sim.service
tests.cleanup defer systemctl disable --now gpio-sim.service
sysfs_gpiochip_num=$(find /sys/class/gpio/ -maxdepth 1 -name 'gpiochip*' -printf "%f" -quit | cut -c9-)
# save the current revision of the pc snap. At this moment the pc snap is
# the original snap.
original_revision=$(readlink /snap/pc/current)
cp /var/lib/snapd/snaps/pc_*.snap gadget.snap
unsquashfs -d pc-snap gadget.snap
cp -r pc-snap pc-snap-without-gpio
cat << EOF >> pc-snap/meta/snap.yaml
slots:
gpio-pin:
interface: gpio
number: $sysfs_gpiochip_num
direction: out
gpio-chardev-0:
interface: gpio-chardev
source-chip: [gpio-bank0]
lines: 0-7
gpio-chardev-1:
interface: gpio-chardev
source-chip: [gpio-bank1]
lines: 0,6
EOF
cat << EOF >> pc-snap-without-gpio/meta/snap.yaml
slots:
gpio-chardev-0:
interface: gpio-chardev
source-chip: [gpio-bank0]
lines: 0-7
gpio-chardev-1:
interface: gpio-chardev
source-chip: [gpio-bank1]
lines: 0,6
EOF
snap pack pc-snap --filename=pc_x1.snap
snap pack pc-snap-without-gpio --filename=pc-snap-without-gpio_x1.snap
snap install pc_x1.snap --dangerous
tests.cleanup defer snap revert pc --revision="$original_revision"
snap install test-snapd-gpio-chardev
tests.cleanup defer snap remove --purge test-snapd-gpio-chardev
snap install test-snapd-gpio-control
tests.cleanup defer snap remove --purge test-snapd-gpio-control
snap connect test-snapd-gpio-control:gpio-control
# Install "gpio" consumer snap to test conflict detection
# of active connections
"$TESTSTOOLS"/snaps-state install-local gpio-consumer
execute: |
if [ "$SPREAD_REBOOT" = 0 ]; then
# Check number of gpiochips before connection
find /dev/gpiochip* | wc -l | MATCH '^2$'
echo 'Test conflict detection with "gpio" connection'
snap connect gpio-consumer:gpio pc:gpio-pin
not snap connect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0 2> conflict.out
MATCH 'interface "gpio-chardev" and "gpio" cannot be connected at the same time: "gpio" is already connected' < conflict.out
snap disconnect gpio-consumer:gpio pc:gpio-pin
# gpio-chardev connection works now
snap connect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0
echo "and vice-versa conflict is also detected"
not snap connect gpio-consumer:gpio pc:gpio-pin 2> conflict.out
MATCH 'interface "gpio" and "gpio-chardev" cannot be connected at the same time: "gpio-chardev" is already connected' < conflict.out
# Test that refreshing the gadget to a revision without "gpio" slots automatically
# disconnects existing connections
snap disconnect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0
snap connect gpio-consumer:gpio pc:gpio-pin
# Cannot connect gpio-chardev
not snap connect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0 2> conflict.out
MATCH 'interface "gpio-chardev" and "gpio" cannot be connected at the same time: "gpio" is already connected' < conflict.out
# Perform gadget refresh
snap install pc-snap-without-gpio_x1.snap --dangerous
# Now gpio-chardev can be connected that gpio connections were automatically
# disconnected due to missing slots
snap connect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0
snap connect test-snapd-gpio-chardev:gpio-chardev-1 pc:gpio-chardev-1
# Check number of gpiochips after connection
find /dev/gpiochip* | wc -l | MATCH '^4$'
echo "The gpio chips are exported for the gadget slot"
test -c /dev/snap/gpio-chardev/pc/gpio-chardev-0
test -c /dev/snap/gpio-chardev/pc/gpio-chardev-1
echo "And symlinks created on the consumer plug side"
readlink /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-0 | MATCH /dev/snap/gpio-chardev/pc/gpio-chardev-0
readlink /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-1 | MATCH /dev/snap/gpio-chardev/pc/gpio-chardev-1
echo "and the right lines are being exported"
# lines 0-7 are exported
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*0:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*1:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*2:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*3:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*4:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*5:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*6:.*consumer=gpio-aggregator.0"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip0 | MATCH "line.*7:.*consumer=gpio-aggregator.0"
# lines 0 and 6 only are exported
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | MATCH "line.*0:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*1:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*2:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*3:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*4:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*5:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | MATCH "line.*6:.*consumer=gpio-aggregator.1"
test-snapd-gpio-control.gpioinfo --chip /dev/gpiochip1 | NOMATCH "line.*7:.*consumer=gpio-aggregator.1"
echo "And gpio-chardev setup dependency was injected into snap service"
systemctl show --property=After snap.test-snapd-gpio-chardev.svc.service | MATCH "gpio-chardev-setup.target"
systemctl show --property=Wants snap.test-snapd-gpio-chardev.svc.service | MATCH "gpio-chardev-setup.target"
mkdir -p /var/snap/test-snapd-gpio-chardev/common/gpiochips
printf "0\n1\n0\n0\n0\n1\n0\n1\n" > /var/snap/test-snapd-gpio-chardev/common/gpiochips/gpio-chardev-0
printf "1\n1\n" > /var/snap/test-snapd-gpio-chardev/common/gpiochips/gpio-chardev-1
# Restart service for values to take effect
snap restart test-snapd-gpio-chardev.svc
chip=/dev/snap/gpio-chardev/pc/gpio-chardev-0
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 0 | MATCH '^"0"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 1 | MATCH '^"1"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 2 | MATCH '^"2"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 3 | MATCH '^"3"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 4 | MATCH '^"4"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 5 | MATCH '^"5"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 6 | MATCH '^"6"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 7 | MATCH '^"7"=active$'
chip=/dev/snap/gpio-chardev/pc/gpio-chardev-1
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 0 | MATCH '^"0"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 1 | MATCH '^"1"=active$'
REBOOT
elif [ "$SPREAD_REBOOT" = 1 ]; then
echo "Snap service should have properly set the gpio lines for each chip"
chip=/dev/snap/gpio-chardev/pc/gpio-chardev-0
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 0 | MATCH '^"0"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 1 | MATCH '^"1"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 2 | MATCH '^"2"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 3 | MATCH '^"3"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 4 | MATCH '^"4"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 5 | MATCH '^"5"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 6 | MATCH '^"6"=inactive$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 7 | MATCH '^"7"=active$'
chip=/dev/snap/gpio-chardev/pc/gpio-chardev-1
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 0 | MATCH '^"0"=active$'
test-snapd-gpio-chardev.cmd gpioget --chip "$chip" 1 | MATCH '^"1"=active$'
echo "Disconnecting unexports the aggregated devices"
snap disconnect test-snapd-gpio-chardev:gpio-chardev-0 pc:gpio-chardev-0
snap disconnect test-snapd-gpio-chardev:gpio-chardev-1 pc:gpio-chardev-1
not test -e /dev/snap/gpio-chardev/pc/gpio-chardev-0
not test -e /dev/snap/gpio-chardev/pc/gpio-chardev-1
not test -e /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-0
not test -e /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-1
# Check number of gpiochips
find /dev/gpiochip* | wc -l | MATCH '^2$'
# Reboot one last time to make sure services run normally even when disconnected
rm -rf /var/snap/test-snapd-gpio-chardev/common/gpiochips
REBOOT
elif [ "$SPREAD_REBOOT" = 2 ]; then
echo "Snap service runs"
retry -n 20 --wait 2 sh -c 'journalctl -u snap.test-snapd-gpio-chardev.svc | MATCH "no chips found under /var/snap/test-snapd-gpio-chardev/common/gpiochips, exiting..."'
echo "And aggregated devices are still unexported"
find /dev/gpiochip* | wc -l | MATCH '^2$'
not test -e /dev/snap/gpio-chardev/pc/gpio-chardev-0
not test -e /dev/snap/gpio-chardev/pc/gpio-chardev-1
not test -e /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-0
not test -e /dev/snap/gpio-chardev/test-snapd-gpio-chardev/gpio-chardev-1
fi
|
