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;
102 * find_php_slot - return hotplug slot structure for device node
103 * @dn: target &device_node
105 * This routine will return the hotplug slot structure
106 * for a given device node. Note that built-in PCI slots
107 * may be dlpar-able, but not hot-pluggable, so this routine
108 * will return NULL for built-in PCI slots.
110 static struct slot *find_php_slot(struct device_node *dn)
112 struct list_head *tmp, *n;
115 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
116 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
124 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
125 struct device_node *dev_dn)
127 struct pci_dev *tmp = NULL;
128 struct device_node *child_dn;
130 list_for_each_entry(tmp, &parent->devices, bus_list) {
131 child_dn = pci_device_to_OF_node(tmp);
132 if (child_dn == dev_dn)
138 static void dlpar_pci_add_bus(struct device_node *dn)
140 struct pci_dn *pdn = PCI_DN(dn);
141 struct pci_controller *phb = pdn->phb;
142 struct pci_dev *dev = NULL;
144 eeh_add_device_tree_early(dn);
146 /* Add EADS device to PHB bus, adding new entry to bus->devices */
147 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
149 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
150 __func__, dn->full_name);
154 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
155 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
156 of_scan_pci_bridge(dn, dev);
158 pcibios_fixup_new_pci_devices(dev->subordinate);
160 /* Claim new bus resources */
161 pcibios_claim_one_bus(dev->bus);
163 /* Map IO space for child bus, which may or may not succeed */
164 pcibios_map_io_space(dev->subordinate);
166 /* Add new devices to global lists. Register in proc, sysfs. */
167 pci_bus_add_devices(phb->bus);
170 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
173 struct pci_controller *phb;
175 if (pcibios_find_pci_bus(dn))
179 dlpar_pci_add_bus(dn);
181 /* Confirm new bridge dev was created */
182 phb = PCI_DN(dn)->phb;
183 dev = dlpar_find_new_dev(phb->bus, dn);
186 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
191 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
192 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
193 __func__, dev->hdr_type, drc_name);
197 /* Add hotplug slot */
198 if (rpaphp_add_slot(dn)) {
199 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
206 static int dlpar_remove_root_bus(struct pci_controller *phb)
208 struct pci_bus *phb_bus;
212 if (!(list_empty(&phb_bus->children) &&
213 list_empty(&phb_bus->devices))) {
217 rc = pcibios_remove_root_bus(phb);
221 device_unregister(phb_bus->bridge);
222 pci_remove_bus(phb_bus);
227 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
233 if (!pcibios_find_pci_bus(dn))
236 /* If pci slot is hotplugable, use hotplug to remove it */
237 slot = find_php_slot(dn);
239 if (rpaphp_deregister_slot(slot)) {
241 "%s: unable to remove hotplug slot %s\n",
248 BUG_ON(!pdn || !pdn->phb);
249 rc = dlpar_remove_root_bus(pdn->phb);
258 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
260 struct pci_controller *phb;
262 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
263 /* PHB already exists */
267 phb = init_phb_dynamic(dn);
271 if (rpaphp_add_slot(dn)) {
272 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
279 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
281 if (vio_find_node(dn))
284 if (!vio_register_device_node(dn)) {
286 "%s: failed to register vio node %s\n",
294 * dlpar_add_slot - DLPAR add an I/O Slot
295 * @drc_name: drc-name of newly added slot
297 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
300 * -ENODEV Not a valid drc_name
301 * -EINVAL Slot already added
302 * -ERESTARTSYS Signalled before obtaining lock
303 * -EIO Internal PCI Error
305 int dlpar_add_slot(char *drc_name)
307 struct device_node *dn = NULL;
311 if (mutex_lock_interruptible(&rpadlpar_mutex))
314 /* Find newly added node */
315 dn = find_dlpar_node(drc_name, &node_type);
323 rc = dlpar_add_vio_slot(drc_name, dn);
326 rc = dlpar_add_pci_slot(drc_name, dn);
329 rc = dlpar_add_phb(drc_name, dn);
333 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
335 mutex_unlock(&rpadlpar_mutex);
340 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
341 * @drc_name: drc-name of newly added slot
344 * Remove the kernel and hotplug representations of an I/O Slot.
347 * -EINVAL Vio dev doesn't exist
349 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
351 struct vio_dev *vio_dev;
353 vio_dev = vio_find_node(dn);
357 vio_unregister_device(vio_dev);
362 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
363 * @drc_name: drc-name of newly added slot
366 * Remove the kernel and hotplug representations of a PCI I/O Slot.
369 * -ENODEV Not a valid drc_name
370 * -EIO Internal PCI Error
372 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
377 bus = pcibios_find_pci_bus(dn);
381 /* If pci slot is hotplugable, use hotplug to remove it */
382 slot = find_php_slot(dn);
384 if (rpaphp_deregister_slot(slot)) {
386 "%s: unable to remove hotplug slot %s\n",
391 pcibios_remove_pci_devices(bus);
393 if (pcibios_unmap_io_space(bus)) {
394 printk(KERN_ERR "%s: failed to unmap bus range\n",
400 pci_remove_bus_device(bus->self);
405 * dlpar_remove_slot - DLPAR remove an I/O Slot
406 * @drc_name: drc-name of newly added slot
408 * Remove the kernel and hotplug representations of an I/O Slot.
411 * -ENODEV Not a valid drc_name
412 * -EINVAL Slot already removed
413 * -ERESTARTSYS Signalled before obtaining lock
414 * -EIO Internal Error
416 int dlpar_remove_slot(char *drc_name)
418 struct device_node *dn;
422 if (mutex_lock_interruptible(&rpadlpar_mutex))
425 dn = find_dlpar_node(drc_name, &node_type);
433 rc = dlpar_remove_vio_slot(drc_name, dn);
436 rc = dlpar_remove_phb(drc_name, dn);
439 rc = dlpar_remove_pci_slot(drc_name, dn);
442 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
444 mutex_unlock(&rpadlpar_mutex);
448 static inline int is_dlpar_capable(void)
450 int rc = rtas_token("ibm,configure-connector");
452 return (int) (rc != RTAS_UNKNOWN_SERVICE);
455 int __init rpadlpar_io_init(void)
459 if (!is_dlpar_capable()) {
460 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
465 rc = dlpar_sysfs_init();
469 void rpadlpar_io_exit(void)
475 module_init(rpadlpar_io_init);
476 module_exit(rpadlpar_io_exit);
477 MODULE_LICENSE("GPL");