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authorJan Beulich <JBeulich@suse.com>2014-12-04 00:40:33 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2014-12-04 15:42:03 +0300
commit6945c59c772be5edd578b12831dee3f7c8576103 (patch)
treefcb7b811cf33cfe11dfdf1a334cb99b2af445ed1 /drivers/xen/xen-pciback
parentb1df4a56bf4a61113e8928f932d346bed6eef553 (diff)
downloadlinux-6945c59c772be5edd578b12831dee3f7c8576103.tar.xz
xen-pciback: drop SR-IOV VFs when PF driver unloads
When a PF driver unloads, it may find it necessary to leave the VFs around simply because of pciback having marked them as assigned to a guest. Utilize a suitable notification to let go of the VFs, thus allowing the PF to go back into the state it was before its driver loaded (which in particular allows the driver to be loaded again with it being able to create the VFs anew, but which also allows to then pass through the PF instead of the VFs). Don't do this however for any VFs currently in active use by a guest. Signed-off-by: Jan Beulich <jbeulich@suse.com> [v2: Removed the switch statement, moved it about] [v3: Redid it a bit differently] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/xen/xen-pciback')
-rw-r--r--drivers/xen/xen-pciback/pci_stub.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 8580e53355ec..cc3cbb4435f8 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -1518,6 +1518,53 @@ parse_error:
fs_initcall(pcistub_init);
#endif
+#ifdef CONFIG_PCI_IOV
+static struct pcistub_device *find_vfs(const struct pci_dev *pdev)
+{
+ struct pcistub_device *psdev = NULL;
+ unsigned long flags;
+ bool found = false;
+
+ spin_lock_irqsave(&pcistub_devices_lock, flags);
+ list_for_each_entry(psdev, &pcistub_devices, dev_list) {
+ if (!psdev->pdev && psdev->dev != pdev
+ && pci_physfn(psdev->dev) == pdev) {
+ found = true;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&pcistub_devices_lock, flags);
+ if (found)
+ return psdev;
+ return NULL;
+}
+
+static int pci_stub_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ const struct pci_dev *pdev = to_pci_dev(dev);
+
+ if (action != BUS_NOTIFY_UNBIND_DRIVER)
+ return NOTIFY_DONE;
+
+ if (!pdev->is_physfn)
+ return NOTIFY_DONE;
+
+ for (;;) {
+ struct pcistub_device *psdev = find_vfs(pdev);
+ if (!psdev)
+ break;
+ device_release_driver(&psdev->dev->dev);
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block pci_stub_nb = {
+ .notifier_call = pci_stub_notifier,
+};
+#endif
+
static int __init xen_pcibk_init(void)
{
int err;
@@ -1539,12 +1586,19 @@ static int __init xen_pcibk_init(void)
err = xen_pcibk_xenbus_register();
if (err)
pcistub_exit();
+#ifdef CONFIG_PCI_IOV
+ else
+ bus_register_notifier(&pci_bus_type, &pci_stub_nb);
+#endif
return err;
}
static void __exit xen_pcibk_cleanup(void)
{
+#ifdef CONFIG_PCI_IOV
+ bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
+#endif
xen_pcibk_xenbus_unregister();
pcistub_exit();
}