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/pci.h>
22 #include <linux/string.h>
24 #include <asm/pci-bridge.h>
25 #include <linux/mutex.h>
33 static DEFINE_MUTEX(rpadlpar_mutex);
35 #define DLPAR_MODULE_NAME "rpadlpar_io"
37 #define NODE_TYPE_VIO 1
38 #define NODE_TYPE_SLOT 2
39 #define NODE_TYPE_PHB 3
41 static struct device_node *find_vio_slot_node(char *drc_name)
43 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
44 struct device_node *dn = NULL;
51 while ((dn = of_get_next_child(parent, dn))) {
52 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
53 if ((rc == 0) && (!strcmp(drc_name, name)))
60 /* Find dlpar-capable pci node that contains the specified name and type */
61 static struct device_node *find_php_slot_pci_node(char *drc_name,
64 struct device_node *np = NULL;
69 while ((np = of_find_node_by_name(np, "pci"))) {
70 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
72 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
79 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
81 struct device_node *dn;
83 dn = find_php_slot_pci_node(drc_name, "SLOT");
85 *node_type = NODE_TYPE_SLOT;
89 dn = find_php_slot_pci_node(drc_name, "PHB");
91 *node_type = NODE_TYPE_PHB;
95 dn = find_vio_slot_node(drc_name);
97 *node_type = NODE_TYPE_VIO;
105 * find_php_slot - return hotplug slot structure for device node
106 * @dn: target &device_node
108 * This routine will return the hotplug slot structure
109 * for a given device node. Note that built-in PCI slots
110 * may be dlpar-able, but not hot-pluggable, so this routine
111 * will return NULL for built-in PCI slots.
113 static struct slot *find_php_slot(struct device_node *dn)
115 struct list_head *tmp, *n;
118 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
119 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
127 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
128 struct device_node *dev_dn)
130 struct pci_dev *tmp = NULL;
131 struct device_node *child_dn;
133 list_for_each_entry(tmp, &parent->devices, bus_list) {
134 child_dn = pci_device_to_OF_node(tmp);
135 if (child_dn == dev_dn)
141 static void dlpar_pci_add_bus(struct device_node *dn)
143 struct pci_dn *pdn = PCI_DN(dn);
144 struct pci_controller *phb = pdn->phb;
145 struct pci_dev *dev = NULL;
147 eeh_add_device_tree_early(dn);
149 /* Add EADS device to PHB bus, adding new entry to bus->devices */
150 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
152 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
153 __func__, dn->full_name);
157 /* Scan below the new bridge */
158 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
159 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
160 of_scan_pci_bridge(dn, 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 (pcibios_find_pci_bus(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 (!pcibios_find_pci_bus(dn))
218 /* If pci slot is hotplugable, 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 if (vio_find_node(dn))
263 if (!vio_register_device_node(dn)) {
265 "%s: failed to register vio node %s\n",
273 * dlpar_add_slot - DLPAR add an I/O Slot
274 * @drc_name: drc-name of newly added slot
276 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
279 * -ENODEV Not a valid drc_name
280 * -EINVAL Slot already added
281 * -ERESTARTSYS Signalled before obtaining lock
282 * -EIO Internal PCI Error
284 int dlpar_add_slot(char *drc_name)
286 struct device_node *dn = NULL;
290 if (mutex_lock_interruptible(&rpadlpar_mutex))
293 /* Find newly added node */
294 dn = find_dlpar_node(drc_name, &node_type);
302 rc = dlpar_add_vio_slot(drc_name, dn);
305 rc = dlpar_add_pci_slot(drc_name, dn);
308 rc = dlpar_add_phb(drc_name, dn);
312 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
314 mutex_unlock(&rpadlpar_mutex);
319 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
320 * @drc_name: drc-name of newly added slot
323 * Remove the kernel and hotplug representations of an I/O Slot.
326 * -EINVAL Vio dev doesn't exist
328 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
330 struct vio_dev *vio_dev;
332 vio_dev = vio_find_node(dn);
336 vio_unregister_device(vio_dev);
341 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
342 * @drc_name: drc-name of newly added slot
345 * Remove the kernel and hotplug representations of a PCI I/O Slot.
348 * -ENODEV Not a valid drc_name
349 * -EIO Internal PCI Error
351 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
356 bus = pcibios_find_pci_bus(dn);
360 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
361 bus->self ? pci_name(bus->self) : "<!PHB!>");
363 slot = find_php_slot(dn);
365 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
366 pci_domain_nr(bus), bus->number);
368 if (rpaphp_deregister_slot(slot)) {
370 "%s: unable to remove hotplug slot %s\n",
376 /* Remove all devices below slot */
377 pcibios_remove_pci_devices(bus);
379 /* Unmap PCI IO space */
380 if (pcibios_unmap_io_space(bus)) {
381 printk(KERN_ERR "%s: failed to unmap bus range\n",
386 /* Remove the EADS bridge device itself */
388 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
389 eeh_remove_bus_device(bus->self);
390 pci_remove_bus_device(bus->self);
396 * dlpar_remove_slot - DLPAR remove an I/O Slot
397 * @drc_name: drc-name of newly added slot
399 * Remove the kernel and hotplug representations of an I/O Slot.
402 * -ENODEV Not a valid drc_name
403 * -EINVAL Slot already removed
404 * -ERESTARTSYS Signalled before obtaining lock
405 * -EIO Internal Error
407 int dlpar_remove_slot(char *drc_name)
409 struct device_node *dn;
413 if (mutex_lock_interruptible(&rpadlpar_mutex))
416 dn = find_dlpar_node(drc_name, &node_type);
424 rc = dlpar_remove_vio_slot(drc_name, dn);
427 rc = dlpar_remove_phb(drc_name, dn);
430 rc = dlpar_remove_pci_slot(drc_name, dn);
433 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
435 mutex_unlock(&rpadlpar_mutex);
439 static inline int is_dlpar_capable(void)
441 int rc = rtas_token("ibm,configure-connector");
443 return (int) (rc != RTAS_UNKNOWN_SERVICE);
446 int __init rpadlpar_io_init(void)
450 if (!is_dlpar_capable()) {
451 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
456 rc = dlpar_sysfs_init();
460 void rpadlpar_io_exit(void)
466 module_init(rpadlpar_io_init);
467 module_exit(rpadlpar_io_exit);
468 MODULE_LICENSE("GPL");