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.
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/string.h>
24 #include <linux/vmalloc.h>
26 #include <asm/pci-bridge.h>
27 #include <linux/mutex.h>
35 static DEFINE_MUTEX(rpadlpar_mutex);
37 #define DLPAR_MODULE_NAME "rpadlpar_io"
39 #define NODE_TYPE_VIO 1
40 #define NODE_TYPE_SLOT 2
41 #define NODE_TYPE_PHB 3
43 static struct device_node *find_vio_slot_node(char *drc_name)
45 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
46 struct device_node *dn = NULL;
53 while ((dn = of_get_next_child(parent, dn))) {
54 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
55 if ((rc == 0) && (!strcmp(drc_name, name)))
62 /* Find dlpar-capable pci node that contains the specified name and type */
63 static struct device_node *find_php_slot_pci_node(char *drc_name,
66 struct device_node *np = NULL;
71 while ((np = of_find_node_by_name(np, "pci"))) {
72 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
74 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
81 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
83 struct device_node *dn;
85 dn = find_php_slot_pci_node(drc_name, "SLOT");
87 *node_type = NODE_TYPE_SLOT;
91 dn = find_php_slot_pci_node(drc_name, "PHB");
93 *node_type = NODE_TYPE_PHB;
97 dn = find_vio_slot_node(drc_name);
99 *node_type = NODE_TYPE_VIO;
107 * find_php_slot - return hotplug slot structure for device node
108 * @dn: target &device_node
110 * This routine will return the hotplug slot structure
111 * for a given device node. Note that built-in PCI slots
112 * may be dlpar-able, but not hot-pluggable, so this routine
113 * will return NULL for built-in PCI slots.
115 static struct slot *find_php_slot(struct device_node *dn)
117 struct slot *slot, *next;
119 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
128 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
129 struct device_node *dev_dn)
131 struct pci_dev *tmp = NULL;
132 struct device_node *child_dn;
134 list_for_each_entry(tmp, &parent->devices, bus_list) {
135 child_dn = pci_device_to_OF_node(tmp);
136 if (child_dn == dev_dn)
142 static void dlpar_pci_add_bus(struct device_node *dn)
144 struct pci_dn *pdn = PCI_DN(dn);
145 struct pci_controller *phb = pdn->phb;
146 struct pci_dev *dev = NULL;
148 eeh_add_device_tree_early(pdn);
150 /* Add EADS device to PHB bus, adding new entry to bus->devices */
151 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
153 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
154 __func__, dn->full_name);
158 /* Scan below the new bridge */
159 if (pci_is_bridge(dev))
160 of_scan_pci_bridge(dev);
162 /* Map IO space for child bus, which may or may not succeed */
163 pcibios_map_io_space(dev->subordinate);
165 /* Finish adding it : resource allocation, adding devices, etc...
166 * Note that we need to perform the finish pass on the -parent-
167 * bus of the EADS bridge so the bridge device itself gets
170 pcibios_finish_adding_to_bus(phb->bus);
173 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
176 struct pci_controller *phb;
178 if (pci_find_bus_by_node(dn))
182 dlpar_pci_add_bus(dn);
184 /* Confirm new bridge dev was created */
185 phb = PCI_DN(dn)->phb;
186 dev = dlpar_find_new_dev(phb->bus, dn);
189 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
194 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
195 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
196 __func__, dev->hdr_type, drc_name);
200 /* Add hotplug slot */
201 if (rpaphp_add_slot(dn)) {
202 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
209 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
215 if (!pci_find_bus_by_node(dn))
218 /* If pci slot is hotpluggable, use hotplug to remove it */
219 slot = find_php_slot(dn);
220 if (slot && rpaphp_deregister_slot(slot)) {
221 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
227 BUG_ON(!pdn || !pdn->phb);
228 rc = remove_phb_dynamic(pdn->phb);
237 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
239 struct pci_controller *phb;
241 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
242 /* PHB already exists */
246 phb = init_phb_dynamic(dn);
250 if (rpaphp_add_slot(dn)) {
251 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
258 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
260 struct vio_dev *vio_dev;
262 vio_dev = vio_find_node(dn);
264 put_device(&vio_dev->dev);
268 if (!vio_register_device_node(dn)) {
270 "%s: failed to register vio node %s\n",
278 * dlpar_add_slot - DLPAR add an I/O Slot
279 * @drc_name: drc-name of newly added slot
281 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
284 * -ENODEV Not a valid drc_name
285 * -EINVAL Slot already added
286 * -ERESTARTSYS Signalled before obtaining lock
287 * -EIO Internal PCI Error
289 int dlpar_add_slot(char *drc_name)
291 struct device_node *dn = NULL;
295 if (mutex_lock_interruptible(&rpadlpar_mutex))
298 /* Find newly added node */
299 dn = find_dlpar_node(drc_name, &node_type);
307 rc = dlpar_add_vio_slot(drc_name, dn);
310 rc = dlpar_add_pci_slot(drc_name, dn);
313 rc = dlpar_add_phb(drc_name, dn);
317 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
319 mutex_unlock(&rpadlpar_mutex);
324 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
325 * @drc_name: drc-name of newly added slot
328 * Remove the kernel and hotplug representations of an I/O Slot.
331 * -EINVAL Vio dev doesn't exist
333 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
335 struct vio_dev *vio_dev;
337 vio_dev = vio_find_node(dn);
341 vio_unregister_device(vio_dev);
343 put_device(&vio_dev->dev);
349 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
350 * @drc_name: drc-name of newly added slot
353 * Remove the kernel and hotplug representations of a PCI I/O Slot.
356 * -ENODEV Not a valid drc_name
357 * -EIO Internal PCI Error
359 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
365 pci_lock_rescan_remove();
367 bus = pci_find_bus_by_node(dn);
373 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
374 bus->self ? pci_name(bus->self) : "<!PHB!>");
376 slot = find_php_slot(dn);
378 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
379 pci_domain_nr(bus), bus->number);
381 if (rpaphp_deregister_slot(slot)) {
383 "%s: unable to remove hotplug slot %s\n",
390 /* Remove all devices below slot */
391 pci_hp_remove_devices(bus);
393 /* Unmap PCI IO space */
394 if (pcibios_unmap_io_space(bus)) {
395 printk(KERN_ERR "%s: failed to unmap bus range\n",
401 /* Remove the EADS bridge device itself */
403 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
404 pci_stop_and_remove_bus_device(bus->self);
407 pci_unlock_rescan_remove();
412 * dlpar_remove_slot - DLPAR remove an I/O Slot
413 * @drc_name: drc-name of newly added slot
415 * Remove the kernel and hotplug representations of an I/O Slot.
418 * -ENODEV Not a valid drc_name
419 * -EINVAL Slot already removed
420 * -ERESTARTSYS Signalled before obtaining lock
421 * -EIO Internal Error
423 int dlpar_remove_slot(char *drc_name)
425 struct device_node *dn;
429 if (mutex_lock_interruptible(&rpadlpar_mutex))
432 dn = find_dlpar_node(drc_name, &node_type);
440 rc = dlpar_remove_vio_slot(drc_name, dn);
443 rc = dlpar_remove_phb(drc_name, dn);
446 rc = dlpar_remove_pci_slot(drc_name, dn);
451 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
453 mutex_unlock(&rpadlpar_mutex);
457 static inline int is_dlpar_capable(void)
459 int rc = rtas_token("ibm,configure-connector");
461 return (int) (rc != RTAS_UNKNOWN_SERVICE);
464 int __init rpadlpar_io_init(void)
467 if (!is_dlpar_capable()) {
468 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
473 return dlpar_sysfs_init();
476 void rpadlpar_io_exit(void)
482 module_init(rpadlpar_io_init);
483 module_exit(rpadlpar_io_exit);
484 MODULE_LICENSE("GPL");