[PATCH] powerpc: migrate common PCI hotplug code

23-rpaphp-migrate.patch (parts)

This patch moves some pci device add & remove code from the PCI
hotplug directory to the arch/powerpc/kernel directory, and cleans
it up a tad. The primary reason for this is that the code performs
some fairly generic operations that are shared with the PCI error
recovery code (living in the arch/powerpc/kernel directory).

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 174 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
new file mode 100644
index 000000000000..283377a536bd
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -0,0 +1,174 @@
+/*
+ * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
+ * for RPA-compliant PPC64 platform.
+ * 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>
+ *
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/pci.h>
+#include <asm/pci-bridge.h>
+
+static struct pci_bus *
+find_bus_among_children(struct pci_bus *bus,
+                        struct device_node *dn)
+{
+        struct pci_bus *child = NULL;
+        struct list_head *tmp;
+        struct device_node *busdn;
+
+        busdn = pci_bus_to_OF_node(bus);
+        if (busdn == dn)
+                return bus;
+
+        list_for_each(tmp, &bus->children) {
+                child = find_bus_among_children(pci_bus_b(tmp), dn);
+                if (child)
+                        break;
+        };
+        return child;
+}
+
+struct pci_bus *
+pcibios_find_pci_bus(struct device_node *dn)
+{
+        struct pci_dn *pdn = dn->data;
+
+        if (!pdn  || !pdn->phb || !pdn->phb->bus)
+                return NULL;
+
+        return find_bus_among_children(pdn->phb->bus, dn);
+}
+
+/**
+ * pcibios_remove_pci_devices - remove all devices under this 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;
+
+        list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
+                eeh_remove_bus_device(dev);
+                pci_remove_bus_device(dev);
+        }
+}
+
+/* Must be called before pci_bus_add_devices */
+static void
+pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                /*
+                 * Skip already-present devices (which are on the
+                 * global device list.)
+                 */
+                if (list_empty(&dev->global_list)) {
+                        int i;
+
+                        /* Need to setup IOMMU tables */
+                        ppc_md.iommu_dev_setup(dev);
+
+                        if(fix_bus)
+                                pcibios_fixup_device_resources(dev, bus);
+                        pci_read_irq_line(dev);
+                        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+                                struct resource *r = &dev->resource[i];
+
+                                if (r->parent || !r->start || !r->flags)
+                                        continue;
+                                pci_claim_resource(dev, i);
+                        }
+                }
+        }
+}
+
+static int
+pcibios_pci_config_bridge(struct pci_dev *dev)
+{
+        u8 sec_busno;
+        struct pci_bus *child_bus;
+        struct pci_dev *child_dev;
+
+        /* Get busno of downstream bus */
+        pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
+
+        /* Add to children of PCI bridge dev->bus */
+        child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
+        if (!child_bus) {
+                printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
+                return -EIO;
+        }
+        sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
+
+        pci_scan_child_bus(child_bus);
+
+        list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
+                eeh_add_device_late(child_dev);
+        }
+
+        /* Fixup new pci devices without touching bus struct */
+        pcibios_fixup_new_pci_devices(child_bus, 0);
+
+        /* Make the discovered devices available */
+        pci_bus_add_devices(child_bus);
+        return 0;
+}
+
+/**
+ * pcibios_add_pci_devices - adds new pci devices to 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, num;
+        struct pci_dev *dev;
+        struct device_node *dn = pci_bus_to_OF_node(bus);
+
+        eeh_add_device_tree_early(dn);
+
+        /* pci_scan_slot should find all children */
+        slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
+        num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
+        if (num) {
+                pcibios_fixup_new_pci_devices(bus, 1);
+                pci_bus_add_devices(bus);
+        }
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                eeh_add_device_late (dev);
+                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+                        pcibios_pci_config_bridge(dev);
+        }
+}