Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pci / remove.c

diff --git a/kernel/drivers/pci/remove.c b/kernel/drivers/pci/remove.c
new file mode 100644 (file)
index 0000000..8a280e9
--- /dev/null
+++ b/kernel/drivers/pci/remove.c
@@ -0,0 +1,162 @@
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/pci-aspm.h>
+#include "pci.h"
+
+static void pci_free_resources(struct pci_dev *dev)
+{
+       int i;
+
+       pci_cleanup_rom(dev);
+       for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+               struct resource *res = dev->resource + i;
+               if (res->parent)
+                       release_resource(res);
+       }
+}
+
+static void pci_stop_dev(struct pci_dev *dev)
+{
+       pci_pme_active(dev, false);
+
+       if (dev->is_added) {
+               pci_proc_detach_device(dev);
+               pci_remove_sysfs_dev_files(dev);
+               device_release_driver(&dev->dev);
+               dev->is_added = 0;
+       }
+
+       if (dev->bus->self)
+               pcie_aspm_exit_link_state(dev);
+}
+
+static void pci_destroy_dev(struct pci_dev *dev)
+{
+       if (!dev->dev.kobj.parent)
+               return;
+
+       device_del(&dev->dev);
+
+       down_write(&pci_bus_sem);
+       list_del(&dev->bus_list);
+       up_write(&pci_bus_sem);
+
+       pci_free_resources(dev);
+       put_device(&dev->dev);
+}
+
+void pci_remove_bus(struct pci_bus *bus)
+{
+       pci_proc_detach_bus(bus);
+
+       down_write(&pci_bus_sem);
+       list_del(&bus->node);
+       pci_bus_release_busn_res(bus);
+       up_write(&pci_bus_sem);
+       pci_remove_legacy_files(bus);
+       pcibios_remove_bus(bus);
+       device_unregister(&bus->dev);
+}
+EXPORT_SYMBOL(pci_remove_bus);
+
+static void pci_stop_bus_device(struct pci_dev *dev)
+{
+       struct pci_bus *bus = dev->subordinate;
+       struct pci_dev *child, *tmp;
+
+       /*
+        * Stopping an SR-IOV PF device removes all the associated VFs,
+        * which will update the bus->devices list and confuse the
+        * iterator.  Therefore, iterate in reverse so we remove the VFs
+        * first, then the PF.
+        */
+       if (bus) {
+               list_for_each_entry_safe_reverse(child, tmp,
+                                                &bus->devices, bus_list)
+                       pci_stop_bus_device(child);
+       }
+
+       pci_stop_dev(dev);
+}
+
+static void pci_remove_bus_device(struct pci_dev *dev)
+{
+       struct pci_bus *bus = dev->subordinate;
+       struct pci_dev *child, *tmp;
+
+       if (bus) {
+               list_for_each_entry_safe(child, tmp,
+                                        &bus->devices, bus_list)
+                       pci_remove_bus_device(child);
+
+               pci_remove_bus(bus);
+               dev->subordinate = NULL;
+       }
+
+       pci_destroy_dev(dev);
+}
+
+/**
+ * pci_stop_and_remove_bus_device - remove a PCI device and any children
+ * @dev: the device to remove
+ *
+ * Remove a PCI device from the device lists, informing the drivers
+ * that the device has been removed.  We also remove any subordinate
+ * buses and children in a depth-first manner.
+ *
+ * For each device we remove, delete the device structure from the
+ * device lists, remove the /proc entry, and notify userspace
+ * (/sbin/hotplug).
+ */
+void pci_stop_and_remove_bus_device(struct pci_dev *dev)
+{
+       pci_stop_bus_device(dev);
+       pci_remove_bus_device(dev);
+}
+EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
+
+void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
+{
+       pci_lock_rescan_remove();
+       pci_stop_and_remove_bus_device(dev);
+       pci_unlock_rescan_remove();
+}
+EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
+
+void pci_stop_root_bus(struct pci_bus *bus)
+{
+       struct pci_dev *child, *tmp;
+       struct pci_host_bridge *host_bridge;
+
+       if (!pci_is_root_bus(bus))
+               return;
+
+       host_bridge = to_pci_host_bridge(bus->bridge);
+       list_for_each_entry_safe_reverse(child, tmp,
+                                        &bus->devices, bus_list)
+               pci_stop_bus_device(child);
+
+       /* stop the host bridge */
+       device_release_driver(&host_bridge->dev);
+}
+EXPORT_SYMBOL_GPL(pci_stop_root_bus);
+
+void pci_remove_root_bus(struct pci_bus *bus)
+{
+       struct pci_dev *child, *tmp;
+       struct pci_host_bridge *host_bridge;
+
+       if (!pci_is_root_bus(bus))
+               return;
+
+       host_bridge = to_pci_host_bridge(bus->bridge);
+       list_for_each_entry_safe(child, tmp,
+                                &bus->devices, bus_list)
+               pci_remove_bus_device(child);
+       pci_remove_bus(bus);
+       host_bridge->bus = NULL;
+
+       /* remove the host bridge */
+       device_unregister(&host_bridge->dev);
+}
+EXPORT_SYMBOL_GPL(pci_remove_root_bus);