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.
Signed-off-by: Matthew Wood <thepacketgeek@xxxxxxxxx>
---
drivers/pci/pci-sysfs.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 268c69daa4d5..72bc266388d4 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -239,6 +239,22 @@ static ssize_t current_link_width_show(struct device *dev,
}
static DEVICE_ATTR_RO(current_link_width);
+static ssize_t device_serial_number_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ u64 dsn;
+
+ dsn = pci_get_dsn(pci_dev);
+ if (!dsn)
+ return -EINVAL;
+
+ return sysfs_emit(buf, "%02llx-%02llx-%02llx-%02llx-%02llx-%02llx-%02llx-%02llx\n",
+ dsn >> 56, (dsn >> 48) & 0xff, (dsn >> 40) & 0xff, (dsn >> 32) & 0xff,
+ (dsn >> 24) & 0xff, (dsn >> 16) & 0xff, (dsn >> 8) & 0xff, dsn & 0xff);
+}
+static DEVICE_ATTR_RO(device_serial_number);
+
static ssize_t secondary_bus_number_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -660,6 +676,7 @@ static struct attribute *pcie_dev_attrs[] = {
&dev_attr_current_link_width.attr,
&dev_attr_max_link_width.attr,
&dev_attr_max_link_speed.attr,
+ &dev_attr_device_serial_number.attr,
NULL,
};
--
2.50.0
