linux-kernel - [PATCH pci-next v1 0/1] PCI/sysfs: Expose PCIe device serial number

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Message-ID: <20250713011714.384621-1-thepacketgeek@gmail.com>
Date: Sat, 12 Jul 2025 18:17:12 -0700
From: Matthew Wood <thepacketgeek@...il.com>
To: "Bjorn Helgaas" <bhelgaas@...gle.com>
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH pci-next v1 0/1] PCI/sysfs: Expose PCIe device serial number

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