linux-kernel - [PATCH v4 0/1] PCI/sysfs: Expose PCIe device serial number

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Message-ID: <20250717162240.512045-1-thepacketgeek@gmail.com>
Date: Thu, 17 Jul 2025 09:22:38 -0700
From: Matthew Wood <thepacketgeek@...il.com>
To: "Bjorn Helgaas" <bhelgaas@...gle.com>
Cc: "Jonathan Cameron" <Jonathan.Cameron@...wei.com>,
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/1] PCI/sysfs: Expose PCIe device serial number

Add a single sysfs read-only, admin-only interface for reading PCIe device
serial numbers from userspace, using the same hexadecimal 1-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:ef:00.0/serial_number
    00-80-ee-00-00-00-41-80

If a device doesn't support the serial number capability, the
serial_number sysfs attribute will not be visible.

Comparing serial number format to lspci output:

    sudo lspci -vvv -s ef:00.0
        ef: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
            ...

This PCIe device sysfs attribute eliminates the need for parsing lspci
output (e.g. regexp) for userspace applications that utilize serial
numbers.

Matthew Wood (1):
  PCI/sysfs: Expose PCIe device serial number

 Documentation/ABI/testing/sysfs-bus-pci |  9 +++++++++
 drivers/pci/pci-sysfs.c                 | 26 ++++++++++++++++++++++---
 2 files changed, 32 insertions(+), 3 deletions(-)

-- 
2.50.0