+#ifdef CONFIG_PCI_MSI
+static ssize_t sriov_vf_total_msix_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ u32 vf_total_msix = 0;
+
+ device_lock(dev);
+ if (!pdev->driver || !pdev->driver->sriov_get_vf_total_msix)
+ goto unlock;
+
+ vf_total_msix = pdev->driver->sriov_get_vf_total_msix(pdev);
+unlock:
+ device_unlock(dev);
+ return sysfs_emit(buf, "%u\n", vf_total_msix);
+}
+static DEVICE_ATTR_RO(sriov_vf_total_msix);
+
+static ssize_t sriov_vf_msix_count_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pci_dev *vf_dev = to_pci_dev(dev);
+ struct pci_dev *pdev = pci_physfn(vf_dev);
+ int val, ret;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < 0)
+ return -EINVAL;
+
+ device_lock(&pdev->dev);
+ if (!pdev->driver || !pdev->driver->sriov_set_msix_vec_count) {
+ ret = -EOPNOTSUPP;
+ goto err_pdev;
+ }
+
+ device_lock(&vf_dev->dev);
+ if (vf_dev->driver) {
+ /*
+ * A driver is already attached to this VF and has configured
+ * itself based on the current MSI-X vector count. Changing
+ * the vector size could mess up the driver, so block it.
+ */
+ ret = -EBUSY;
+ goto err_dev;
+ }
+
+ ret = pdev->driver->sriov_set_msix_vec_count(vf_dev, val);
+
+err_dev:
+ device_unlock(&vf_dev->dev);
+err_pdev:
+ device_unlock(&pdev->dev);
+ return ret ? : count;
+}
+static DEVICE_ATTR_WO(sriov_vf_msix_count);
+#endif
+
+static struct attribute *sriov_vf_dev_attrs[] = {
+#ifdef CONFIG_PCI_MSI
+ &dev_attr_sriov_vf_msix_count.attr,
+#endif
+ NULL,
+};
+
+static umode_t sriov_vf_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ if (!pdev->is_virtfn)
+ return 0;
+
+ return a->mode;
+}
+
+const struct attribute_group sriov_vf_dev_attr_group = {
+ .attrs = sriov_vf_dev_attrs,
+ .is_visible = sriov_vf_attrs_are_visible,
+};
+