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Fri, 18 Jul 2025 12:32:31 -0700 (PDT) Received: from localhost ([2600:1700:22f5:908f:1457:7499:d258:358f]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b3f2fe8ea7bsm1610609a12.21.2025.07.18.12.32.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jul 2025 12:32:31 -0700 (PDT) From: Matthew Wood To: "Bjorn Helgaas" Cc: "Mario Limonciello" , "Jonathan Cameron" , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 0/1] PCI/sysfs: Expose PCIe device serial number Date: Fri, 18 Jul 2025 12:32:28 -0700 Message-ID: <20250718193230.300055-1-thepacketgeek@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: sudo cat /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 | 27 ++++++++++++++++++++++--- 2 files changed, 33 insertions(+), 3 deletions(-) -- 2.50.1