On Sat, 12 Jul 2025 18:17:12 -0700 Matthew Wood <thepacketgeek@xxxxxxxxx> wrote: > 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 > What is the use case for this? I can think of some possibilities but good to see why you care here. > 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: Better if possible to not expose the sysfs attribute if no such capability. We already have pcie_dev_attrs_are_visible() so easy to extend that. > > 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(+) >
