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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/pci_dlpar.c

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  1 /*
  2  * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
  3  * for RPA-compliant PPC64 platform.
  4  * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
  5  * Copyright (C) 2005 International Business Machines
  6  *
  7  * Updates, 2005, John Rose <johnrose@austin.ibm.com>
  8  * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
  9  *
 10  * All rights reserved.
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License as published by
 14  * the Free Software Foundation; either version 2 of the License, or (at
 15  * your option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful, but
 18  * WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 20  * NON INFRINGEMENT.  See the GNU General Public License for more
 21  * details.
 22  *
 23  * You should have received a copy of the GNU General Public License
 24  * along with this program; if not, write to the Free Software
 25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 26  */
 27 
 28 #include <linux/pci.h>
 29 #include <asm/pci-bridge.h>
 30 #include <asm/ppc-pci.h>
 31 #include <asm/firmware.h>
 32 #include <asm/eeh.h>
 33 
 34 static struct pci_bus *
 35 find_bus_among_children(struct pci_bus *bus,
 36                         struct device_node *dn)
 37 {
 38         struct pci_bus *child = NULL;
 39         struct list_head *tmp;
 40         struct device_node *busdn;
 41 
 42         busdn = pci_bus_to_OF_node(bus);
 43         if (busdn == dn)
 44                 return bus;
 45 
 46         list_for_each(tmp, &bus->children) {
 47                 child = find_bus_among_children(pci_bus_b(tmp), dn);
 48                 if (child)
 49                         break;
 50         };
 51         return child;
 52 }
 53 
 54 struct pci_bus *
 55 pcibios_find_pci_bus(struct device_node *dn)
 56 {
 57         struct pci_dn *pdn = dn->data;
 58 
 59         if (!pdn  || !pdn->phb || !pdn->phb->bus)
 60                 return NULL;
 61 
 62         return find_bus_among_children(pdn->phb->bus, dn);
 63 }
 64 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
 65 
 66 /**
 67  * pcibios_remove_pci_devices - remove all devices under this bus
 68  *
 69  * Remove all of the PCI devices under this bus both from the
 70  * linux pci device tree, and from the powerpc EEH address cache.
 71  */
 72 void pcibios_remove_pci_devices(struct pci_bus *bus)
 73 {
 74         struct pci_dev *dev, *tmp;
 75         struct pci_bus *child_bus;
 76 
 77         /* First go down child busses */
 78         list_for_each_entry(child_bus, &bus->children, node)
 79                 pcibios_remove_pci_devices(child_bus);
 80 
 81         pr_debug("PCI: Removing devices on bus %04x:%02x\n",
 82                  pci_domain_nr(bus),  bus->number);
 83         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
 84                 pr_debug("     * Removing %s...\n", pci_name(dev));
 85                 eeh_remove_bus_device(dev);
 86                 pci_remove_bus_device(dev);
 87         }
 88 }
 89 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
 90 
 91 /**
 92  * pcibios_add_pci_devices - adds new pci devices to bus
 93  *
 94  * This routine will find and fixup new pci devices under
 95  * the indicated bus. This routine presumes that there
 96  * might already be some devices under this bridge, so
 97  * it carefully tries to add only new devices.  (And that
 98  * is how this routine differs from other, similar pcibios
 99  * routines.)
100  */
101 void pcibios_add_pci_devices(struct pci_bus * bus)
102 {
103         int slotno, num, mode, pass, max;
104         struct pci_dev *dev;
105         struct device_node *dn = pci_bus_to_OF_node(bus);
106 
107         eeh_add_device_tree_early(dn);
108 
109         mode = PCI_PROBE_NORMAL;
110         if (ppc_md.pci_probe_mode)
111                 mode = ppc_md.pci_probe_mode(bus);
112 
113         if (mode == PCI_PROBE_DEVTREE) {
114                 /* use ofdt-based probe */
115                 of_rescan_bus(dn, bus);
116         } else if (mode == PCI_PROBE_NORMAL) {
117                 /* use legacy probe */
118                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
119                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
120                 if (!num)
121                         return;
122                 pcibios_setup_bus_devices(bus);
123                 max = bus->secondary;
124                 for (pass=0; pass < 2; pass++)
125                         list_for_each_entry(dev, &bus->devices, bus_list) {
126                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
127                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
128                                 max = pci_scan_bridge(bus, dev, max, pass);
129                 }
130         }
131         pcibios_finish_adding_to_bus(bus);
132 }
133 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
134 
135 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
136 {
137         struct pci_controller *phb;
138 
139         pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);
140 
141         phb = pcibios_alloc_controller(dn);
142         if (!phb)
143                 return NULL;
144         rtas_setup_phb(phb);
145         pci_process_bridge_OF_ranges(phb, dn, 0);
146 
147         pci_devs_phb_init_dynamic(phb);
148 
149         if (dn->child)
150                 eeh_add_device_tree_early(dn);
151 
152         pcibios_scan_phb(phb);
153         pcibios_finish_adding_to_bus(phb->bus);
154 
155         return phb;
156 }
157 EXPORT_SYMBOL_GPL(init_phb_dynamic);
158 
159 /* RPA-specific bits for removing PHBs */
160 int remove_phb_dynamic(struct pci_controller *phb)
161 {
162         struct pci_bus *b = phb->bus;
163         struct resource *res;
164         int rc, i;
165 
166         pr_debug("PCI: Removing PHB %04x:%02x...\n",
167                  pci_domain_nr(b), b->number);
168 
169         /* We cannot to remove a root bus that has children */
170         if (!(list_empty(&b->children) && list_empty(&b->devices)))
171                 return -EBUSY;
172 
173         /* We -know- there aren't any child devices anymore at this stage
174          * and thus, we can safely unmap the IO space as it's not in use
175          */
176         res = &phb->io_resource;
177         if (res->flags & IORESOURCE_IO) {
178                 rc = pcibios_unmap_io_space(b);
179                 if (rc) {
180                         printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
181                                __func__, b->name);
182                         return 1;
183                 }
184         }
185 
186         /* Unregister the bridge device from sysfs and remove the PCI bus */
187         device_unregister(b->bridge);
188         phb->bus = NULL;
189         pci_remove_bus(b);
190 
191         /* Now release the IO resource */
192         if (res->flags & IORESOURCE_IO)
193                 release_resource(res);
194 
195         /* Release memory resources */
196         for (i = 0; i < 3; ++i) {
197                 res = &phb->mem_resources[i];
198                 if (!(res->flags & IORESOURCE_MEM))
199                         continue;
200                 release_resource(res);
201         }
202 
203         /* Free pci_controller data structure */
204         pcibios_free_controller(phb);
205 
206         return 0;
207 }
208 EXPORT_SYMBOL_GPL(remove_phb_dynamic);
209 

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