Add a single sysfs read-only interface for reading PCIe device serial
numbers from userspace in a programmatic way. This device attribute
uses the same 2-byte dashed formatting as lspci serial number capability
output:
more /sys/devices/pci0000:c0/0000:c0:01.1/0000:c1:00.0/0000:c2:1f.0/0000:cc:00.0/device_serial_number
00-80-ee-00-00-00-41-80
Accompanying lspci output:
sudo lspci -vvv -s cc:00.0
cc:00.0 Serial Attached SCSI controller: Broadcom / LSI PCIe Switch management endpoint (rev b0)
Subsystem: Broadcom / LSI Device 0144
...
Capabilities: [100 v1] Device Serial Number 00-80-ee-00-00-00-41-80
...
If a device doesn't support the serial number capability, userspace will receive
an empty read:
more /sys/devices/pci0000:00/0000:00:07.1/device_serial_number
echo $?
0
Matthew Wood (1):
PCI/sysfs: Expose PCIe device serial number
drivers/pci/pci-sysfs.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--
2.50.0
