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 int pci_add_secondary_bus(struct device_node *dn,
138 struct pci_dev *bridge_dev)
140 struct pci_dn *pdn = dn->data;
141 struct pci_controller *hose = pdn->phb;
142 struct pci_bus *child;
145 /* Get busno of downstream bus */
146 pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
148 /* Allocate and add to children of bridge_dev->bus */
149 child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
151 printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
155 sprintf(child->name, "PCI Bus #%02x", child->number);
157 /* Fixup subordinate bridge bases and resources */
158 pcibios_fixup_bus(child);
160 /* Claim new bus resources */
161 rpadlpar_claim_one_bus(bridge_dev->bus);
163 if (hose->last_busno < child->number)
164 hose->last_busno = child->number;
166 pdn->bussubno = child->number;
168 /* ioremap() for child bus, which may or may not succeed */
169 remap_bus_range(child);
174 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
175 struct device_node *dev_dn)
177 struct pci_dev *tmp = NULL;
178 struct device_node *child_dn;
180 list_for_each_entry(tmp, &parent->devices, bus_list) {
181 child_dn = pci_device_to_OF_node(tmp);
182 if (child_dn == dev_dn)
188 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
190 struct pci_dn *pdn = dn->data;
191 struct pci_controller *hose = pdn->phb;
192 struct pci_dev *dev = NULL;
194 /* Scan phb bus for EADS device, adding new one to bus->devices */
195 if (!pci_scan_single_device(hose->bus, pdn->devfn)) {
196 printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
200 /* Add new devices to global lists. Register in proc, sysfs. */
201 pci_bus_add_devices(hose->bus);
203 /* Confirm new bridge dev was created */
204 dev = dlpar_find_new_dev(hose->bus, dn);
206 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
207 printk(KERN_ERR "%s: unexpected header type %d\n",
208 __FUNCTION__, dev->hdr_type);
212 if (pci_add_secondary_bus(dn, dev))
219 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
224 if (rpaphp_find_pci_bus(dn))
228 dev = dlpar_pci_add_bus(dn);
230 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
236 rc = rpaphp_config_pci_adapter(dev->subordinate);
238 printk(KERN_ERR "%s: unable to enable slot %s\n",
239 __FUNCTION__, drc_name);
244 /* Add hotplug slot */
245 if (rpaphp_add_slot(dn)) {
246 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
247 __FUNCTION__, drc_name);
253 static int dlpar_remove_root_bus(struct pci_controller *phb)
255 struct pci_bus *phb_bus;
259 if (!(list_empty(&phb_bus->children) &&
260 list_empty(&phb_bus->devices))) {
264 rc = pcibios_remove_root_bus(phb);
268 device_unregister(phb_bus->bridge);
269 pci_remove_bus(phb_bus);
274 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
280 if (!rpaphp_find_pci_bus(dn))
283 slot = find_slot(dn);
285 /* Remove hotplug slot */
286 if (rpaphp_remove_slot(slot)) {
288 "%s: unable to remove hotplug slot %s\n",
289 __FUNCTION__, drc_name);
295 BUG_ON(!pdn || !pdn->phb);
296 rc = dlpar_remove_root_bus(pdn->phb);
305 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
307 struct pci_controller *phb;
309 if (PCI_DN(dn)->phb) {
310 /* PHB already exists */
314 phb = init_phb_dynamic(dn);
318 if (rpaphp_add_slot(dn)) {
319 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
320 __FUNCTION__, drc_name);
326 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
328 if (vio_find_node(dn))
331 if (!vio_register_device_node(dn)) {
333 "%s: failed to register vio node %s\n",
334 __FUNCTION__, drc_name);
341 * dlpar_add_slot - DLPAR add an I/O Slot
342 * @drc_name: drc-name of newly added slot
344 * Make the hotplug module and the kernel aware
345 * of a newly added I/O Slot.
348 * -ENODEV Not a valid drc_name
349 * -EINVAL Slot already added
350 * -ERESTARTSYS Signalled before obtaining lock
351 * -EIO Internal PCI Error
353 int dlpar_add_slot(char *drc_name)
355 struct device_node *dn = NULL;
359 if (down_interruptible(&rpadlpar_sem))
362 /* Find newly added node */
363 dn = find_dlpar_node(drc_name, &node_type);
371 rc = dlpar_add_vio_slot(drc_name, dn);
374 rc = dlpar_add_pci_slot(drc_name, dn);
377 rc = dlpar_add_phb(drc_name, dn);
381 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
388 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
389 * @drc_name: drc-name of newly added slot
391 * Remove the kernel and hotplug representations
395 * -EINVAL Vio dev doesn't exist
397 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
399 struct vio_dev *vio_dev;
401 vio_dev = vio_find_node(dn);
405 vio_unregister_device(vio_dev);
410 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
411 * @drc_name: drc-name of newly added slot
413 * Remove the kernel and hotplug representations
417 * -ENODEV Not a valid drc_name
418 * -EIO Internal PCI Error
420 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
425 bus = rpaphp_find_pci_bus(dn);
429 slot = find_slot(dn);
431 /* Remove hotplug slot */
432 if (rpaphp_remove_slot(slot)) {
434 "%s: unable to remove hotplug slot %s\n",
435 __FUNCTION__, drc_name);
440 if (unmap_bus_range(bus)) {
441 printk(KERN_ERR "%s: failed to unmap bus range\n",
447 pci_remove_bus_device(bus->self);
452 * dlpar_remove_slot - DLPAR remove an I/O Slot
453 * @drc_name: drc-name of newly added slot
455 * Remove the kernel and hotplug representations
459 * -ENODEV Not a valid drc_name
460 * -EINVAL Slot already removed
461 * -ERESTARTSYS Signalled before obtaining lock
462 * -EIO Internal Error
464 int dlpar_remove_slot(char *drc_name)
466 struct device_node *dn;
470 if (down_interruptible(&rpadlpar_sem))
473 dn = find_dlpar_node(drc_name, &node_type);
481 rc = dlpar_remove_vio_slot(drc_name, dn);
484 rc = dlpar_remove_phb(drc_name, dn);
487 rc = dlpar_remove_pci_slot(drc_name, dn);
490 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
496 static inline int is_dlpar_capable(void)
498 int rc = rtas_token("ibm,configure-connector");
500 return (int) (rc != RTAS_UNKNOWN_SERVICE);
503 int __init rpadlpar_io_init(void)
507 if (!is_dlpar_capable()) {
508 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
513 rc = dlpar_sysfs_init();
517 void rpadlpar_io_exit(void)
523 module_init(rpadlpar_io_init);
524 module_exit(rpadlpar_io_exit);
525 MODULE_LICENSE("GPL");