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>
23 #include <linux/vmalloc.h>
25 #include <asm/pci-bridge.h>
26 #include <linux/mutex.h>
34 static DEFINE_MUTEX(rpadlpar_mutex);
36 #define DLPAR_MODULE_NAME "rpadlpar_io"
38 #define NODE_TYPE_VIO 1
39 #define NODE_TYPE_SLOT 2
40 #define NODE_TYPE_PHB 3
42 static struct device_node *find_vio_slot_node(char *drc_name)
44 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
45 struct device_node *dn = NULL;
52 while ((dn = of_get_next_child(parent, dn))) {
53 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
54 if ((rc == 0) && (!strcmp(drc_name, name)))
61 /* Find dlpar-capable pci node that contains the specified name and type */
62 static struct device_node *find_php_slot_pci_node(char *drc_name,
65 struct device_node *np = NULL;
70 while ((np = of_find_node_by_name(np, "pci"))) {
71 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
73 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
80 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
82 struct device_node *dn;
84 dn = find_php_slot_pci_node(drc_name, "SLOT");
86 *node_type = NODE_TYPE_SLOT;
90 dn = find_php_slot_pci_node(drc_name, "PHB");
92 *node_type = NODE_TYPE_PHB;
96 dn = find_vio_slot_node(drc_name);
98 *node_type = NODE_TYPE_VIO;
106 * find_php_slot - return hotplug slot structure for device node
107 * @dn: target &device_node
109 * This routine will return the hotplug slot structure
110 * for a given device node. Note that built-in PCI slots
111 * may be dlpar-able, but not hot-pluggable, so this routine
112 * will return NULL for built-in PCI slots.
114 static struct slot *find_php_slot(struct device_node *dn)
116 struct list_head *tmp, *n;
119 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
120 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
128 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
129 struct device_node *dev_dn)
131 struct pci_dev *tmp = NULL;
132 struct device_node *child_dn;
134 list_for_each_entry(tmp, &parent->devices, bus_list) {
135 child_dn = pci_device_to_OF_node(tmp);
136 if (child_dn == dev_dn)
142 static void dlpar_pci_add_bus(struct device_node *dn)
144 struct pci_dn *pdn = PCI_DN(dn);
145 struct pci_controller *phb = pdn->phb;
146 struct pci_dev *dev = NULL;
148 eeh_add_device_tree_early(dn);
150 /* Add EADS device to PHB bus, adding new entry to bus->devices */
151 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
153 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
154 __func__, dn->full_name);
158 /* Scan below the new bridge */
159 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
160 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
161 of_scan_pci_bridge(dn, dev);
163 /* Map IO space for child bus, which may or may not succeed */
164 pcibios_map_io_space(dev->subordinate);
166 /* Finish adding it : resource allocation, adding devices, etc...
167 * Note that we need to perform the finish pass on the -parent-
168 * bus of the EADS bridge so the bridge device itself gets
171 pcibios_finish_adding_to_bus(phb->bus);
174 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
177 struct pci_controller *phb;
179 if (pcibios_find_pci_bus(dn))
183 dlpar_pci_add_bus(dn);
185 /* Confirm new bridge dev was created */
186 phb = PCI_DN(dn)->phb;
187 dev = dlpar_find_new_dev(phb->bus, dn);
190 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
195 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
196 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
197 __func__, dev->hdr_type, drc_name);
201 /* Add hotplug slot */
202 if (rpaphp_add_slot(dn)) {
203 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
210 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
216 if (!pcibios_find_pci_bus(dn))
219 /* If pci slot is hotplugable, use hotplug to remove it */
220 slot = find_php_slot(dn);
221 if (slot && rpaphp_deregister_slot(slot)) {
222 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
228 BUG_ON(!pdn || !pdn->phb);
229 rc = remove_phb_dynamic(pdn->phb);
238 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
240 struct pci_controller *phb;
242 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
243 /* PHB already exists */
247 phb = init_phb_dynamic(dn);
251 if (rpaphp_add_slot(dn)) {
252 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
259 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
261 if (vio_find_node(dn))
264 if (!vio_register_device_node(dn)) {
266 "%s: failed to register vio node %s\n",
274 * dlpar_add_slot - DLPAR add an I/O Slot
275 * @drc_name: drc-name of newly added slot
277 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
280 * -ENODEV Not a valid drc_name
281 * -EINVAL Slot already added
282 * -ERESTARTSYS Signalled before obtaining lock
283 * -EIO Internal PCI Error
285 int dlpar_add_slot(char *drc_name)
287 struct device_node *dn = NULL;
291 if (mutex_lock_interruptible(&rpadlpar_mutex))
294 /* Find newly added node */
295 dn = find_dlpar_node(drc_name, &node_type);
303 rc = dlpar_add_vio_slot(drc_name, dn);
306 rc = dlpar_add_pci_slot(drc_name, dn);
309 rc = dlpar_add_phb(drc_name, dn);
313 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
315 mutex_unlock(&rpadlpar_mutex);
320 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
321 * @drc_name: drc-name of newly added slot
324 * Remove the kernel and hotplug representations of an I/O Slot.
327 * -EINVAL Vio dev doesn't exist
329 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
331 struct vio_dev *vio_dev;
333 vio_dev = vio_find_node(dn);
337 vio_unregister_device(vio_dev);
342 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
343 * @drc_name: drc-name of newly added slot
346 * Remove the kernel and hotplug representations of a PCI I/O Slot.
349 * -ENODEV Not a valid drc_name
350 * -EIO Internal PCI Error
352 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
357 bus = pcibios_find_pci_bus(dn);
361 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
362 bus->self ? pci_name(bus->self) : "<!PHB!>");
364 slot = find_php_slot(dn);
366 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
367 pci_domain_nr(bus), bus->number);
369 if (rpaphp_deregister_slot(slot)) {
371 "%s: unable to remove hotplug slot %s\n",
377 /* Remove all devices below slot */
378 pcibios_remove_pci_devices(bus);
380 /* Unmap PCI IO space */
381 if (pcibios_unmap_io_space(bus)) {
382 printk(KERN_ERR "%s: failed to unmap bus range\n",
387 /* Remove the EADS bridge device itself */
389 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
390 eeh_remove_bus_device(bus->self);
391 pci_remove_bus_device(bus->self);
397 * dlpar_remove_slot - DLPAR remove an I/O Slot
398 * @drc_name: drc-name of newly added slot
400 * Remove the kernel and hotplug representations of an I/O Slot.
403 * -ENODEV Not a valid drc_name
404 * -EINVAL Slot already removed
405 * -ERESTARTSYS Signalled before obtaining lock
406 * -EIO Internal Error
408 int dlpar_remove_slot(char *drc_name)
410 struct device_node *dn;
414 if (mutex_lock_interruptible(&rpadlpar_mutex))
417 dn = find_dlpar_node(drc_name, &node_type);
425 rc = dlpar_remove_vio_slot(drc_name, dn);
428 rc = dlpar_remove_phb(drc_name, dn);
431 rc = dlpar_remove_pci_slot(drc_name, dn);
436 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
438 mutex_unlock(&rpadlpar_mutex);
442 static inline int is_dlpar_capable(void)
444 int rc = rtas_token("ibm,configure-connector");
446 return (int) (rc != RTAS_UNKNOWN_SERVICE);
449 int __init rpadlpar_io_init(void)
453 if (!is_dlpar_capable()) {
454 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
459 rc = dlpar_sysfs_init();
463 void rpadlpar_io_exit(void)
469 module_init(rpadlpar_io_init);
470 module_exit(rpadlpar_io_exit);
471 MODULE_LICENSE("GPL");