Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'pci/misc'
- Fix whitespace issues (Li Jun)
- Fix pci_acpi_preserve_config() memory leak (Nirmoy Das)
- Add sysfs 'serial_number' file to expose the Device Serial Number
(Matthew Wood)
* pci/misc:
PCI/sysfs: Expose PCI device serial number
PCI/ACPI: Fix pci_acpi_preserve_config() memory leak
+34
-2
+9
Documentation/ABI/testing/sysfs-bus-pci
+9
Documentation/ABI/testing/sysfs-bus-pci
···
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# ls doe_features
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0001:01 0001:02 doe_discovery
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+
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+
What: /sys/bus/pci/devices/.../serial_number
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+
Date: December 2025
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+
Contact: Matthew Wood <thepacketgeek@gmail.com>
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Description:
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This is visible only for PCI devices that support the serial
621
+
number extended capability. The file is read only and due to
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+
the possible sensitivity of accessible serial numbers, admin
623
+
only.
+4
-2
drivers/pci/pci-acpi.c
+4
-2
drivers/pci/pci-acpi.c
···
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bool pci_acpi_preserve_config(struct pci_host_bridge *host_bridge)
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{
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+
bool ret = false;
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+
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if (ACPI_HANDLE(&host_bridge->dev)) {
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union acpi_object *obj;
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129
···
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1, DSM_PCI_PRESERVE_BOOT_CONFIG,
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NULL, ACPI_TYPE_INTEGER);
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if (obj && obj->integer.value == 0)
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-
return true;
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+
ret = true;
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ACPI_FREE(obj);
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}
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-
return false;
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+
return ret;
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}
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/* _HPX PCI Setting Record (Type 0); same as _HPP */
+21
drivers/pci/pci-sysfs.c
+21
drivers/pci/pci-sysfs.c
···
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#include <linux/msi.h>
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#include <linux/of.h>
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32
#include <linux/aperture.h>
33
+
#include <linux/unaligned.h>
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#include "pci.h"
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#ifndef ARCH_PCI_DEV_GROUPS
···
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IORESOURCE_ROM_SHADOW));
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}
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static DEVICE_ATTR_RO(boot_vga);
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+
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+
static ssize_t serial_number_show(struct device *dev,
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+
struct device_attribute *attr, char *buf)
724
+
{
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+
struct pci_dev *pci_dev = to_pci_dev(dev);
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+
u64 dsn;
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+
u8 bytes[8];
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+
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+
dsn = pci_get_dsn(pci_dev);
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+
if (!dsn)
731
+
return -EIO;
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+
733
+
put_unaligned_be64(dsn, bytes);
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+
return sysfs_emit(buf, "%8phD\n", bytes);
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+
}
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+
static DEVICE_ATTR_ADMIN_RO(serial_number);
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static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
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const struct bin_attribute *bin_attr, char *buf,
···
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static struct attribute *pci_dev_dev_attrs[] = {
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&dev_attr_boot_vga.attr,
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+
&dev_attr_serial_number.attr,
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NULL,
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1734
};
1751
1735
···
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struct pci_dev *pdev = to_pci_dev(dev);
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if (a == &dev_attr_boot_vga.attr && pci_is_vga(pdev))
1742
+
return a->mode;
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+
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+
if (a == &dev_attr_serial_number.attr && pci_get_dsn(pdev))
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return a->mode;
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return 0;