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/module.h>
22 #include <linux/pci.h>
23 #include <linux/string.h>
24 #include <linux/vmalloc.h>
26 #include <asm/pci-bridge.h>
27 #include <linux/mutex.h>
35 static DEFINE_MUTEX(rpadlpar_mutex);
37 #define DLPAR_MODULE_NAME "rpadlpar_io"
39 #define NODE_TYPE_VIO 1
40 #define NODE_TYPE_SLOT 2
41 #define NODE_TYPE_PHB 3
43 static struct device_node *find_vio_slot_node(char *drc_name)
45 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
46 struct device_node *dn = NULL;
53 while ((dn = of_get_next_child(parent, dn))) {
54 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
55 if ((rc == 0) && (!strcmp(drc_name, name)))
63 /* Find dlpar-capable pci node that contains the specified name and type */
64 static struct device_node *find_php_slot_pci_node(char *drc_name,
67 struct device_node *np = NULL;
72 while ((np = of_find_node_by_name(np, "pci"))) {
73 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
75 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
82 /* Returns a device_node with its reference count incremented */
83 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
85 struct device_node *dn;
87 dn = find_php_slot_pci_node(drc_name, "SLOT");
89 *node_type = NODE_TYPE_SLOT;
93 dn = find_php_slot_pci_node(drc_name, "PHB");
95 *node_type = NODE_TYPE_PHB;
99 dn = find_vio_slot_node(drc_name);
101 *node_type = NODE_TYPE_VIO;
109 * find_php_slot - return hotplug slot structure for device node
110 * @dn: target &device_node
112 * This routine will return the hotplug slot structure
113 * for a given device node. Note that built-in PCI slots
114 * may be dlpar-able, but not hot-pluggable, so this routine
115 * will return NULL for built-in PCI slots.
117 static struct slot *find_php_slot(struct device_node *dn)
119 struct slot *slot, *next;
121 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
130 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
131 struct device_node *dev_dn)
133 struct pci_dev *tmp = NULL;
134 struct device_node *child_dn;
136 list_for_each_entry(tmp, &parent->devices, bus_list) {
137 child_dn = pci_device_to_OF_node(tmp);
138 if (child_dn == dev_dn)
144 static void dlpar_pci_add_bus(struct device_node *dn)
146 struct pci_dn *pdn = PCI_DN(dn);
147 struct pci_controller *phb = pdn->phb;
148 struct pci_dev *dev = NULL;
150 eeh_add_device_tree_early(pdn);
152 /* Add EADS device to PHB bus, adding new entry to bus->devices */
153 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
155 printk(KERN_ERR "%s: failed to create pci dev for %pOF\n",
160 /* Scan below the new bridge */
161 if (pci_is_bridge(dev))
162 of_scan_pci_bridge(dev);
164 /* Map IO space for child bus, which may or may not succeed */
165 pcibios_map_io_space(dev->subordinate);
167 /* Finish adding it : resource allocation, adding devices, etc...
168 * Note that we need to perform the finish pass on the -parent-
169 * bus of the EADS bridge so the bridge device itself gets
172 pcibios_finish_adding_to_bus(phb->bus);
175 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
178 struct pci_controller *phb;
180 if (pci_find_bus_by_node(dn))
184 dlpar_pci_add_bus(dn);
186 /* Confirm new bridge dev was created */
187 phb = PCI_DN(dn)->phb;
188 dev = dlpar_find_new_dev(phb->bus, dn);
191 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
196 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
197 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
198 __func__, dev->hdr_type, drc_name);
202 /* Add hotplug slot */
203 if (rpaphp_add_slot(dn)) {
204 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
211 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
217 if (!pci_find_bus_by_node(dn))
220 /* If pci slot is hotpluggable, use hotplug to remove it */
221 slot = find_php_slot(dn);
222 if (slot && rpaphp_deregister_slot(slot)) {
223 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
229 BUG_ON(!pdn || !pdn->phb);
230 rc = remove_phb_dynamic(pdn->phb);
239 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
241 struct pci_controller *phb;
243 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
244 /* PHB already exists */
248 phb = init_phb_dynamic(dn);
252 if (rpaphp_add_slot(dn)) {
253 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
260 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
262 struct vio_dev *vio_dev;
264 vio_dev = vio_find_node(dn);
266 put_device(&vio_dev->dev);
270 if (!vio_register_device_node(dn)) {
272 "%s: failed to register vio node %s\n",
280 * dlpar_add_slot - DLPAR add an I/O Slot
281 * @drc_name: drc-name of newly added slot
283 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
286 * -ENODEV Not a valid drc_name
287 * -EINVAL Slot already added
288 * -ERESTARTSYS Signalled before obtaining lock
289 * -EIO Internal PCI Error
291 int dlpar_add_slot(char *drc_name)
293 struct device_node *dn = NULL;
297 if (mutex_lock_interruptible(&rpadlpar_mutex))
300 /* Find newly added node */
301 dn = find_dlpar_node(drc_name, &node_type);
309 rc = dlpar_add_vio_slot(drc_name, dn);
312 rc = dlpar_add_pci_slot(drc_name, dn);
315 rc = dlpar_add_phb(drc_name, dn);
320 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
322 mutex_unlock(&rpadlpar_mutex);
327 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
328 * @drc_name: drc-name of newly added slot
331 * Remove the kernel and hotplug representations of an I/O Slot.
334 * -EINVAL Vio dev doesn't exist
336 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
338 struct vio_dev *vio_dev;
340 vio_dev = vio_find_node(dn);
344 vio_unregister_device(vio_dev);
346 put_device(&vio_dev->dev);
352 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
353 * @drc_name: drc-name of newly added slot
356 * Remove the kernel and hotplug representations of a PCI I/O Slot.
359 * -ENODEV Not a valid drc_name
360 * -EIO Internal PCI Error
362 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
368 pci_lock_rescan_remove();
370 bus = pci_find_bus_by_node(dn);
376 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
377 bus->self ? pci_name(bus->self) : "<!PHB!>");
379 slot = find_php_slot(dn);
381 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
382 pci_domain_nr(bus), bus->number);
384 if (rpaphp_deregister_slot(slot)) {
386 "%s: unable to remove hotplug slot %s\n",
393 /* Remove all devices below slot */
394 pci_hp_remove_devices(bus);
396 /* Unmap PCI IO space */
397 if (pcibios_unmap_io_space(bus)) {
398 printk(KERN_ERR "%s: failed to unmap bus range\n",
404 /* Remove the EADS bridge device itself */
406 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
407 pci_stop_and_remove_bus_device(bus->self);
410 pci_unlock_rescan_remove();
415 * dlpar_remove_slot - DLPAR remove an I/O Slot
416 * @drc_name: drc-name of newly added slot
418 * Remove the kernel and hotplug representations of an I/O Slot.
421 * -ENODEV Not a valid drc_name
422 * -EINVAL Slot already removed
423 * -ERESTARTSYS Signalled before obtaining lock
424 * -EIO Internal Error
426 int dlpar_remove_slot(char *drc_name)
428 struct device_node *dn;
432 if (mutex_lock_interruptible(&rpadlpar_mutex))
435 dn = find_dlpar_node(drc_name, &node_type);
443 rc = dlpar_remove_vio_slot(drc_name, dn);
446 rc = dlpar_remove_phb(drc_name, dn);
449 rc = dlpar_remove_pci_slot(drc_name, dn);
455 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
457 mutex_unlock(&rpadlpar_mutex);
461 static inline int is_dlpar_capable(void)
463 int rc = rtas_token("ibm,configure-connector");
465 return (int) (rc != RTAS_UNKNOWN_SERVICE);
468 int __init rpadlpar_io_init(void)
471 if (!is_dlpar_capable()) {
472 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
477 return dlpar_sysfs_init();
480 void rpadlpar_io_exit(void)
486 module_init(rpadlpar_io_init);
487 module_exit(rpadlpar_io_exit);
488 MODULE_LICENSE("GPL");