2 * Interface for Dynamic Logical Partitioning of I/O Slots on
3 * RPA-compliant PPC64 platform.
5 * John Rose <johnrose@austin.ibm.com>
6 * Linda Xie <lxie@us.ibm.com>
10 * Copyright (C) 2003 IBM.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 #include <linux/init.h>
18 #include <linux/pci.h>
19 #include <linux/string.h>
21 #include <asm/pci-bridge.h>
22 #include <linux/mutex.h>
30 static DEFINE_MUTEX(rpadlpar_mutex);
32 #define DLPAR_MODULE_NAME "rpadlpar_io"
34 #define NODE_TYPE_VIO 1
35 #define NODE_TYPE_SLOT 2
36 #define NODE_TYPE_PHB 3
38 static struct device_node *find_vio_slot_node(char *drc_name)
40 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
41 struct device_node *dn = NULL;
48 while ((dn = of_get_next_child(parent, dn))) {
49 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
50 if ((rc == 0) && (!strcmp(drc_name, name)))
57 /* Find dlpar-capable pci node that contains the specified name and type */
58 static struct device_node *find_php_slot_pci_node(char *drc_name,
61 struct device_node *np = NULL;
66 while ((np = of_find_node_by_name(np, "pci"))) {
67 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
69 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
76 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
78 struct device_node *dn;
80 dn = find_php_slot_pci_node(drc_name, "SLOT");
82 *node_type = NODE_TYPE_SLOT;
86 dn = find_php_slot_pci_node(drc_name, "PHB");
88 *node_type = NODE_TYPE_PHB;
92 dn = find_vio_slot_node(drc_name);
94 *node_type = NODE_TYPE_VIO;
101 static struct slot *find_slot(struct device_node *dn)
103 struct list_head *tmp, *n;
106 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
107 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
115 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
116 struct device_node *dev_dn)
118 struct pci_dev *tmp = NULL;
119 struct device_node *child_dn;
121 list_for_each_entry(tmp, &parent->devices, bus_list) {
122 child_dn = pci_device_to_OF_node(tmp);
123 if (child_dn == dev_dn)
129 static void dlpar_pci_add_bus(struct device_node *dn)
131 struct pci_dn *pdn = PCI_DN(dn);
132 struct pci_controller *phb = pdn->phb;
133 struct pci_dev *dev = NULL;
135 eeh_add_device_tree_early(dn);
137 /* Add EADS device to PHB bus, adding new entry to bus->devices */
138 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
140 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
141 __FUNCTION__, dn->full_name);
145 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
146 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
147 of_scan_pci_bridge(dn, dev);
149 pcibios_fixup_new_pci_devices(dev->subordinate,0);
151 /* Claim new bus resources */
152 pcibios_claim_one_bus(dev->bus);
154 /* ioremap() for child bus, which may or may not succeed */
155 remap_bus_range(dev->subordinate);
157 /* Add new devices to global lists. Register in proc, sysfs. */
158 pci_bus_add_devices(phb->bus);
161 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
164 struct pci_controller *phb;
166 if (pcibios_find_pci_bus(dn))
170 dlpar_pci_add_bus(dn);
172 /* Confirm new bridge dev was created */
173 phb = PCI_DN(dn)->phb;
174 dev = dlpar_find_new_dev(phb->bus, dn);
177 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
182 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
183 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
184 __FUNCTION__, dev->hdr_type, drc_name);
188 /* Add hotplug slot */
189 if (rpaphp_add_slot(dn)) {
190 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
191 __FUNCTION__, drc_name);
197 static int dlpar_remove_root_bus(struct pci_controller *phb)
199 struct pci_bus *phb_bus;
203 if (!(list_empty(&phb_bus->children) &&
204 list_empty(&phb_bus->devices))) {
208 rc = pcibios_remove_root_bus(phb);
212 device_unregister(phb_bus->bridge);
213 pci_remove_bus(phb_bus);
218 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
224 if (!pcibios_find_pci_bus(dn))
227 slot = find_slot(dn);
229 /* Remove hotplug slot */
230 if (rpaphp_deregister_slot(slot)) {
232 "%s: unable to remove hotplug slot %s\n",
233 __FUNCTION__, drc_name);
239 BUG_ON(!pdn || !pdn->phb);
240 rc = dlpar_remove_root_bus(pdn->phb);
249 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
251 struct pci_controller *phb;
253 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
254 /* PHB already exists */
258 phb = init_phb_dynamic(dn);
262 if (rpaphp_add_slot(dn)) {
263 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
264 __FUNCTION__, drc_name);
270 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
272 if (vio_find_node(dn))
275 if (!vio_register_device_node(dn)) {
277 "%s: failed to register vio node %s\n",
278 __FUNCTION__, drc_name);
285 * dlpar_add_slot - DLPAR add an I/O Slot
286 * @drc_name: drc-name of newly added slot
288 * Make the hotplug module and the kernel aware
289 * of a newly added I/O Slot.
292 * -ENODEV Not a valid drc_name
293 * -EINVAL Slot already added
294 * -ERESTARTSYS Signalled before obtaining lock
295 * -EIO Internal PCI Error
297 int dlpar_add_slot(char *drc_name)
299 struct device_node *dn = NULL;
303 if (mutex_lock_interruptible(&rpadlpar_mutex))
306 /* Find newly added node */
307 dn = find_dlpar_node(drc_name, &node_type);
315 rc = dlpar_add_vio_slot(drc_name, dn);
318 rc = dlpar_add_pci_slot(drc_name, dn);
321 rc = dlpar_add_phb(drc_name, dn);
325 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
327 mutex_unlock(&rpadlpar_mutex);
332 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
333 * @drc_name: drc-name of newly added slot
335 * Remove the kernel and hotplug representations
339 * -EINVAL Vio dev doesn't exist
341 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
343 struct vio_dev *vio_dev;
345 vio_dev = vio_find_node(dn);
349 vio_unregister_device(vio_dev);
354 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
355 * @drc_name: drc-name of newly added slot
357 * Remove the kernel and hotplug representations
361 * -ENODEV Not a valid drc_name
362 * -EIO Internal PCI Error
364 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
369 bus = pcibios_find_pci_bus(dn);
373 slot = find_slot(dn);
375 /* Remove hotplug slot */
376 if (rpaphp_deregister_slot(slot)) {
378 "%s: unable to remove hotplug slot %s\n",
379 __FUNCTION__, drc_name);
383 struct pci_dev *dev, *tmp;
384 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
385 eeh_remove_bus_device(dev);
386 pci_remove_bus_device(dev);
390 if (unmap_bus_range(bus)) {
391 printk(KERN_ERR "%s: failed to unmap bus range\n",
397 pci_remove_bus_device(bus->self);
402 * dlpar_remove_slot - DLPAR remove an I/O Slot
403 * @drc_name: drc-name of newly added slot
405 * Remove the kernel and hotplug representations
409 * -ENODEV Not a valid drc_name
410 * -EINVAL Slot already removed
411 * -ERESTARTSYS Signalled before obtaining lock
412 * -EIO Internal Error
414 int dlpar_remove_slot(char *drc_name)
416 struct device_node *dn;
420 if (mutex_lock_interruptible(&rpadlpar_mutex))
423 dn = find_dlpar_node(drc_name, &node_type);
431 rc = dlpar_remove_vio_slot(drc_name, dn);
434 rc = dlpar_remove_phb(drc_name, dn);
437 rc = dlpar_remove_pci_slot(drc_name, dn);
440 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
442 mutex_unlock(&rpadlpar_mutex);
446 static inline int is_dlpar_capable(void)
448 int rc = rtas_token("ibm,configure-connector");
450 return (int) (rc != RTAS_UNKNOWN_SERVICE);
453 int __init rpadlpar_io_init(void)
457 if (!is_dlpar_capable()) {
458 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
463 rc = dlpar_sysfs_init();
467 void rpadlpar_io_exit(void)
473 module_init(rpadlpar_io_init);
474 module_exit(rpadlpar_io_exit);
475 MODULE_LICENSE("GPL");