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Currently, the time it took a PCI device to become ready after reset is
only printed if it was longer than 1000ms ('PCI_RESET_WAIT'). However,
for debugging purposes it is useful to know this time even if it was
shorter. For example, with the device I am working on, hardware
engineers asked to verify that it becomes ready on the first try (no
delay).
To that end, add a debug level print that can be enabled using dynamic
debug. Example:
# echo 1 > /sys/bus/pci/devices/0000\:01\:00.0/reset
# dmesg -c | grep ready
# echo "file drivers/pci/pci.c +p" > /sys/kernel/debug/dynamic_debug/control
# echo 1 > /sys/bus/pci/devices/0000\:01\:00.0/reset
# dmesg -c | grep ready
[ 396.060335] mlxsw_spectrum4 0000:01:00.0: ready 0ms after bus reset
# echo "file drivers/pci/pci.c -p" > /sys/kernel/debug/dynamic_debug/control
# echo 1 > /sys/bus/pci/devices/0000\:01\:00.0/reset
# dmesg -c | grep ready
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
0a5ef95923