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 <asm/pci-bridge.h>
20 #include <asm/semaphore.h>
27 static DECLARE_MUTEX(rpadlpar_sem);
29 #define DLPAR_MODULE_NAME "rpadlpar_io"
31 #define NODE_TYPE_VIO 1
32 #define NODE_TYPE_SLOT 2
33 #define NODE_TYPE_PHB 3
35 static struct device_node *find_vio_slot_node(char *drc_name)
37 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
38 struct device_node *dn = NULL;
45 while ((dn = of_get_next_child(parent, dn))) {
46 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
47 if ((rc == 0) && (!strcmp(drc_name, name)))
54 /* Find dlpar-capable pci node that contains the specified name and type */
55 static struct device_node *find_php_slot_pci_node(char *drc_name,
58 struct device_node *np = NULL;
63 while ((np = of_find_node_by_type(np, "pci"))) {
64 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
66 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
73 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
75 struct device_node *dn;
77 dn = find_php_slot_pci_node(drc_name, "SLOT");
79 *node_type = NODE_TYPE_SLOT;
83 dn = find_php_slot_pci_node(drc_name, "PHB");
85 *node_type = NODE_TYPE_PHB;
89 dn = find_vio_slot_node(drc_name);
91 *node_type = NODE_TYPE_VIO;
98 static struct slot *find_slot(struct device_node *dn)
100 struct list_head *tmp, *n;
103 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
104 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
112 static void rpadlpar_claim_one_bus(struct pci_bus *b)
114 struct list_head *ld;
115 struct pci_bus *child_bus;
117 for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
118 struct pci_dev *dev = pci_dev_b(ld);
121 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
122 struct resource *r = &dev->resource[i];
124 if (r->parent || !r->start || !r->flags)
126 rpaphp_claim_resource(dev, i);
130 list_for_each_entry(child_bus, &b->children, node)
131 rpadlpar_claim_one_bus(child_bus);
134 static int pci_add_secondary_bus(struct device_node *dn,
135 struct pci_dev *bridge_dev)
137 struct pci_controller *hose = dn->phb;
138 struct pci_bus *child;
141 /* Get busno of downstream bus */
142 pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
144 /* Allocate and add to children of bridge_dev->bus */
145 child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
147 printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
151 sprintf(child->name, "PCI Bus #%02x", child->number);
153 /* Fixup subordinate bridge bases and resources */
154 pcibios_fixup_bus(child);
156 /* Claim new bus resources */
157 rpadlpar_claim_one_bus(bridge_dev->bus);
159 if (hose->last_busno < child->number)
160 hose->last_busno = child->number;
162 dn->bussubno = child->number;
164 /* ioremap() for child bus, which may or may not succeed */
165 remap_bus_range(child);
170 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
171 struct device_node *dev_dn)
173 struct pci_dev *tmp = NULL;
174 struct device_node *child_dn;
176 list_for_each_entry(tmp, &parent->devices, bus_list) {
177 child_dn = pci_device_to_OF_node(tmp);
178 if (child_dn == dev_dn)
184 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
186 struct pci_controller *hose = dn->phb;
187 struct pci_dev *dev = NULL;
189 /* Scan phb bus for EADS device, adding new one to bus->devices */
190 if (!pci_scan_single_device(hose->bus, dn->devfn)) {
191 printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
195 /* Add new devices to global lists. Register in proc, sysfs. */
196 pci_bus_add_devices(hose->bus);
198 /* Confirm new bridge dev was created */
199 dev = dlpar_find_new_dev(hose->bus, dn);
201 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
202 printk(KERN_ERR "%s: unexpected header type %d\n",
203 __FUNCTION__, dev->hdr_type);
207 if (pci_add_secondary_bus(dn, dev))
214 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
219 if (rpaphp_find_pci_bus(dn))
223 dev = dlpar_pci_add_bus(dn);
225 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
231 rc = rpaphp_config_pci_adapter(dev->subordinate);
233 printk(KERN_ERR "%s: unable to enable slot %s\n",
234 __FUNCTION__, drc_name);
239 /* Add hotplug slot */
240 if (rpaphp_add_slot(dn)) {
241 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
242 __FUNCTION__, drc_name);
248 static int dlpar_remove_root_bus(struct pci_controller *phb)
250 struct pci_bus *phb_bus;
254 if (!(list_empty(&phb_bus->children) &&
255 list_empty(&phb_bus->devices))) {
259 rc = pcibios_remove_root_bus(phb);
263 device_unregister(phb_bus->bridge);
264 pci_remove_bus(phb_bus);
269 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
274 if (!rpaphp_find_pci_bus(dn))
277 slot = find_slot(dn);
279 /* Remove hotplug slot */
280 if (rpaphp_remove_slot(slot)) {
282 "%s: unable to remove hotplug slot %s\n",
283 __FUNCTION__, drc_name);
289 rc = dlpar_remove_root_bus(dn->phb);
298 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
300 struct pci_controller *phb;
303 /* PHB already exists */
307 phb = init_phb_dynamic(dn);
311 if (rpaphp_add_slot(dn)) {
312 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
313 __FUNCTION__, drc_name);
319 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
321 if (vio_find_node(dn))
324 if (!vio_register_device_node(dn)) {
326 "%s: failed to register vio node %s\n",
327 __FUNCTION__, drc_name);
334 * dlpar_add_slot - DLPAR add an I/O Slot
335 * @drc_name: drc-name of newly added slot
337 * Make the hotplug module and the kernel aware
338 * of a newly added I/O Slot.
341 * -ENODEV Not a valid drc_name
342 * -EINVAL Slot already added
343 * -ERESTARTSYS Signalled before obtaining lock
344 * -EIO Internal PCI Error
346 int dlpar_add_slot(char *drc_name)
348 struct device_node *dn = NULL;
352 if (down_interruptible(&rpadlpar_sem))
355 /* Find newly added node */
356 dn = find_dlpar_node(drc_name, &node_type);
364 rc = dlpar_add_vio_slot(drc_name, dn);
367 rc = dlpar_add_pci_slot(drc_name, dn);
370 rc = dlpar_add_phb(drc_name, dn);
374 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
381 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
382 * @drc_name: drc-name of newly added slot
384 * Remove the kernel and hotplug representations
388 * -EINVAL Vio dev doesn't exist
390 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
392 struct vio_dev *vio_dev;
394 vio_dev = vio_find_node(dn);
398 vio_unregister_device(vio_dev);
403 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
404 * @drc_name: drc-name of newly added slot
406 * Remove the kernel and hotplug representations
410 * -ENODEV Not a valid drc_name
411 * -EIO Internal PCI Error
413 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
418 bus = rpaphp_find_pci_bus(dn);
422 slot = find_slot(dn);
424 /* Remove hotplug slot */
425 if (rpaphp_remove_slot(slot)) {
427 "%s: unable to remove hotplug slot %s\n",
428 __FUNCTION__, drc_name);
433 if (unmap_bus_range(bus)) {
434 printk(KERN_ERR "%s: failed to unmap bus range\n",
440 pci_remove_bus_device(bus->self);
445 * dlpar_remove_slot - DLPAR remove an I/O Slot
446 * @drc_name: drc-name of newly added slot
448 * Remove the kernel and hotplug representations
452 * -ENODEV Not a valid drc_name
453 * -EINVAL Slot already removed
454 * -ERESTARTSYS Signalled before obtaining lock
455 * -EIO Internal Error
457 int dlpar_remove_slot(char *drc_name)
459 struct device_node *dn;
463 if (down_interruptible(&rpadlpar_sem))
466 dn = find_dlpar_node(drc_name, &node_type);
474 rc = dlpar_remove_vio_slot(drc_name, dn);
477 rc = dlpar_remove_phb(drc_name, dn);
480 rc = dlpar_remove_pci_slot(drc_name, dn);
483 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
489 static inline int is_dlpar_capable(void)
491 int rc = rtas_token("ibm,configure-connector");
493 return (int) (rc != RTAS_UNKNOWN_SERVICE);
496 int __init rpadlpar_io_init(void)
500 if (!is_dlpar_capable()) {
501 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
506 rc = dlpar_sysfs_init();
510 void rpadlpar_io_exit(void)
516 module_init(rpadlpar_io_init);
517 module_exit(rpadlpar_io_exit);
518 MODULE_LICENSE("GPL");