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 <asm/semaphore.h>
30 static DECLARE_MUTEX(rpadlpar_sem);
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_type(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 void rpadlpar_claim_one_bus(struct pci_bus *b)
117 struct list_head *ld;
118 struct pci_bus *child_bus;
120 for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
121 struct pci_dev *dev = pci_dev_b(ld);
124 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
125 struct resource *r = &dev->resource[i];
127 if (r->parent || !r->start || !r->flags)
129 rpaphp_claim_resource(dev, i);
133 list_for_each_entry(child_bus, &b->children, node)
134 rpadlpar_claim_one_bus(child_bus);
137 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
138 struct device_node *dev_dn)
140 struct pci_dev *tmp = NULL;
141 struct device_node *child_dn;
143 list_for_each_entry(tmp, &parent->devices, bus_list) {
144 child_dn = pci_device_to_OF_node(tmp);
145 if (child_dn == dev_dn)
151 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
153 struct pci_dn *pdn = dn->data;
154 struct pci_controller *phb = pdn->phb;
155 struct pci_dev *dev = NULL;
157 rpaphp_eeh_init_nodes(dn);
158 /* Add EADS device to PHB bus, adding new entry to bus->devices */
159 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
161 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
162 __FUNCTION__, dn->full_name);
166 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
167 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
168 of_scan_pci_bridge(dn, dev);
170 rpaphp_init_new_devs(dev->subordinate);
172 /* Claim new bus resources */
173 rpadlpar_claim_one_bus(dev->bus);
175 /* ioremap() for child bus, which may or may not succeed */
176 (void) remap_bus_range(dev->bus);
178 /* Add new devices to global lists. Register in proc, sysfs. */
179 pci_bus_add_devices(phb->bus);
181 /* Confirm new bridge dev was created */
182 dev = dlpar_find_new_dev(phb->bus, dn);
184 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
185 printk(KERN_ERR "%s: unexpected header type %d\n",
186 __FUNCTION__, dev->hdr_type);
194 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
198 if (rpaphp_find_pci_bus(dn))
202 dev = dlpar_pci_add_bus(dn);
204 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
209 /* Add hotplug slot */
210 if (rpaphp_add_slot(dn)) {
211 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
212 __FUNCTION__, drc_name);
218 static int dlpar_remove_root_bus(struct pci_controller *phb)
220 struct pci_bus *phb_bus;
224 if (!(list_empty(&phb_bus->children) &&
225 list_empty(&phb_bus->devices))) {
229 rc = pcibios_remove_root_bus(phb);
233 device_unregister(phb_bus->bridge);
234 pci_remove_bus(phb_bus);
239 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
245 if (!rpaphp_find_pci_bus(dn))
248 slot = find_slot(dn);
250 /* Remove hotplug slot */
251 if (rpaphp_remove_slot(slot)) {
253 "%s: unable to remove hotplug slot %s\n",
254 __FUNCTION__, drc_name);
260 BUG_ON(!pdn || !pdn->phb);
261 rc = dlpar_remove_root_bus(pdn->phb);
270 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
272 struct pci_controller *phb;
274 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
275 /* PHB already exists */
279 phb = init_phb_dynamic(dn);
283 if (rpaphp_add_slot(dn)) {
284 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
285 __FUNCTION__, drc_name);
291 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
293 if (vio_find_node(dn))
296 if (!vio_register_device_node(dn)) {
298 "%s: failed to register vio node %s\n",
299 __FUNCTION__, drc_name);
306 * dlpar_add_slot - DLPAR add an I/O Slot
307 * @drc_name: drc-name of newly added slot
309 * Make the hotplug module and the kernel aware
310 * of a newly added I/O Slot.
313 * -ENODEV Not a valid drc_name
314 * -EINVAL Slot already added
315 * -ERESTARTSYS Signalled before obtaining lock
316 * -EIO Internal PCI Error
318 int dlpar_add_slot(char *drc_name)
320 struct device_node *dn = NULL;
324 if (down_interruptible(&rpadlpar_sem))
327 /* Find newly added node */
328 dn = find_dlpar_node(drc_name, &node_type);
336 rc = dlpar_add_vio_slot(drc_name, dn);
339 rc = dlpar_add_pci_slot(drc_name, dn);
342 rc = dlpar_add_phb(drc_name, dn);
346 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
353 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
354 * @drc_name: drc-name of newly added slot
356 * Remove the kernel and hotplug representations
360 * -EINVAL Vio dev doesn't exist
362 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
364 struct vio_dev *vio_dev;
366 vio_dev = vio_find_node(dn);
370 vio_unregister_device(vio_dev);
375 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
376 * @drc_name: drc-name of newly added slot
378 * Remove the kernel and hotplug representations
382 * -ENODEV Not a valid drc_name
383 * -EIO Internal PCI Error
385 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
390 bus = rpaphp_find_pci_bus(dn);
394 slot = find_slot(dn);
396 /* Remove hotplug slot */
397 if (rpaphp_remove_slot(slot)) {
399 "%s: unable to remove hotplug slot %s\n",
400 __FUNCTION__, drc_name);
404 rpaphp_unconfig_pci_adapter(bus);
407 if (unmap_bus_range(bus)) {
408 printk(KERN_ERR "%s: failed to unmap bus range\n",
414 pci_remove_bus_device(bus->self);
419 * dlpar_remove_slot - DLPAR remove an I/O Slot
420 * @drc_name: drc-name of newly added slot
422 * Remove the kernel and hotplug representations
426 * -ENODEV Not a valid drc_name
427 * -EINVAL Slot already removed
428 * -ERESTARTSYS Signalled before obtaining lock
429 * -EIO Internal Error
431 int dlpar_remove_slot(char *drc_name)
433 struct device_node *dn;
437 if (down_interruptible(&rpadlpar_sem))
440 dn = find_dlpar_node(drc_name, &node_type);
448 rc = dlpar_remove_vio_slot(drc_name, dn);
451 rc = dlpar_remove_phb(drc_name, dn);
454 rc = dlpar_remove_pci_slot(drc_name, dn);
457 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
463 static inline int is_dlpar_capable(void)
465 int rc = rtas_token("ibm,configure-connector");
467 return (int) (rc != RTAS_UNKNOWN_SERVICE);
470 int __init rpadlpar_io_init(void)
474 if (!is_dlpar_capable()) {
475 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
480 rc = dlpar_sysfs_init();
484 void rpadlpar_io_exit(void)
490 module_init(rpadlpar_io_init);
491 module_exit(rpadlpar_io_exit);
492 MODULE_LICENSE("GPL");