+static ssize_t is_enabled_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ ssize_t result = -EINVAL;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ /* this can crash the machine when done on the "wrong" device */
+ if (!capable(CAP_SYS_ADMIN))
+ return count;
+
+ if (*buf == '0') {
+ if (atomic_read(&pdev->enable_cnt) != 0)
+ pci_disable_device(pdev);
+ else
+ result = -EIO;
+ } else if (*buf == '1')
+ result = pci_enable_device(pdev);
+
+ return result < 0 ? result : count;
+}
+
+static ssize_t is_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev;
+
+ pdev = to_pci_dev (dev);
+ return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
+}
+
+static ssize_t
+msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ if (!pdev->subordinate)
+ return 0;
+
+ return sprintf (buf, "%u\n",
+ !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
+}
+
+static ssize_t
+msi_bus_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ /* bad things may happen if the no_msi flag is changed
+ * while some drivers are loaded */
+ if (!capable(CAP_SYS_ADMIN))
+ return count;
+
+ if (!pdev->subordinate)
+ return count;
+
+ if (*buf == '0') {
+ pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
+ dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
+ " bad things could happen.\n");
+ }
+
+ if (*buf == '1') {
+ pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
+ dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
+ " bad things could happen.\n");
+ }
+
+ return count;
+}
+