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-rw-r--r--arch/powerpc/kernel/pci-hotplug.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c
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index 000000000..7ed85a69a
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+++ b/arch/powerpc/kernel/pci-hotplug.c
@@ -0,0 +1,112 @@
+/*
+ * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
+ *
+ * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
+ * Copyright (C) 2005 International Business Machines
+ *
+ * Updates, 2005, John Rose <johnrose@austin.ibm.com>
+ * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
+ * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/pci.h>
+#include <linux/export.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc-pci.h>
+#include <asm/firmware.h>
+#include <asm/eeh.h>
+
+/**
+ * pcibios_release_device - release PCI device
+ * @dev: PCI device
+ *
+ * The function is called before releasing the indicated PCI device.
+ */
+void pcibios_release_device(struct pci_dev *dev)
+{
+ eeh_remove_device(dev);
+}
+
+/**
+ * pcibios_remove_pci_devices - remove all devices under this bus
+ * @bus: the indicated PCI bus
+ *
+ * Remove all of the PCI devices under this bus both from the
+ * linux pci device tree, and from the powerpc EEH address cache.
+ */
+void pcibios_remove_pci_devices(struct pci_bus *bus)
+{
+ struct pci_dev *dev, *tmp;
+ struct pci_bus *child_bus;
+
+ /* First go down child busses */
+ list_for_each_entry(child_bus, &bus->children, node)
+ pcibios_remove_pci_devices(child_bus);
+
+ pr_debug("PCI: Removing devices on bus %04x:%02x\n",
+ pci_domain_nr(bus), bus->number);
+ list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
+ pr_debug(" Removing %s...\n", pci_name(dev));
+ pci_stop_and_remove_bus_device(dev);
+ }
+}
+
+EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
+
+/**
+ * pcibios_add_pci_devices - adds new pci devices to bus
+ * @bus: the indicated PCI bus
+ *
+ * This routine will find and fixup new pci devices under
+ * the indicated bus. This routine presumes that there
+ * might already be some devices under this bridge, so
+ * it carefully tries to add only new devices. (And that
+ * is how this routine differs from other, similar pcibios
+ * routines.)
+ */
+void pcibios_add_pci_devices(struct pci_bus * bus)
+{
+ int slotno, mode, pass, max;
+ struct pci_dev *dev;
+ struct pci_controller *phb;
+ struct device_node *dn = pci_bus_to_OF_node(bus);
+
+ eeh_add_device_tree_early(PCI_DN(dn));
+
+ phb = pci_bus_to_host(bus);
+
+ mode = PCI_PROBE_NORMAL;
+ if (phb->controller_ops.probe_mode)
+ mode = phb->controller_ops.probe_mode(bus);
+
+ if (mode == PCI_PROBE_DEVTREE) {
+ /* use ofdt-based probe */
+ of_rescan_bus(dn, bus);
+ } else if (mode == PCI_PROBE_NORMAL) {
+ /*
+ * Use legacy probe. In the partial hotplug case, we
+ * probably have grandchildren devices unplugged. So
+ * we don't check the return value from pci_scan_slot() in
+ * order for fully rescan all the way down to pick them up.
+ * They can have been removed during partial hotplug.
+ */
+ slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
+ pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
+ pcibios_setup_bus_devices(bus);
+ max = bus->busn_res.start;
+ for (pass = 0; pass < 2; pass++) {
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ if (pci_is_bridge(dev))
+ max = pci_scan_bridge(bus, dev,
+ max, pass);
+ }
+ }
+ }
+ pcibios_finish_adding_to_bus(bus);
+}
+EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);