1/*
2 * Interface for Dynamic Logical Partitioning of I/O Slots on
3 * RPA-compliant PPC64 platform.
4 *
5 * John Rose <johnrose@austin.ibm.com>
6 * Linda Xie <lxie@us.ibm.com>
7 *
8 * October 2003
9 *
10 * Copyright (C) 2003 IBM.
11 *
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.
16 */
17#include <linux/init.h>
18#include <linux/pci.h>
19#include <linux/string.h>
20
21#include <asm/pci-bridge.h>
22#include <linux/mutex.h>
23#include <asm/rtas.h>
24#include <asm/vio.h>
25
26#include "../pci.h"
27#include "rpaphp.h"
28#include "rpadlpar.h"
29
30static DEFINE_MUTEX(rpadlpar_mutex);
31
32#define DLPAR_MODULE_NAME "rpadlpar_io"
33
34#define NODE_TYPE_VIO  1
35#define NODE_TYPE_SLOT 2
36#define NODE_TYPE_PHB  3
37
38static struct device_node *find_vio_slot_node(char *drc_name)
39{
40	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
41	struct device_node *dn = NULL;
42	char *name;
43	int rc;
44
45	if (!parent)
46		return NULL;
47
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)))
51			break;
52	}
53
54	return dn;
55}
56
57/* Find dlpar-capable pci node that contains the specified name and type */
58static struct device_node *find_php_slot_pci_node(char *drc_name,
59						  char *drc_type)
60{
61	struct device_node *np = NULL;
62	char *name;
63	char *type;
64	int rc;
65
66	while ((np = of_find_node_by_name(np, "pci"))) {
67		rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
68		if (rc == 0)
69			if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
70				break;
71	}
72
73	return np;
74}
75
76static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
77{
78	struct device_node *dn;
79
80	dn = find_php_slot_pci_node(drc_name, "SLOT");
81	if (dn) {
82		*node_type = NODE_TYPE_SLOT;
83		return dn;
84	}
85
86	dn = find_php_slot_pci_node(drc_name, "PHB");
87	if (dn) {
88		*node_type = NODE_TYPE_PHB;
89		return dn;
90	}
91
92	dn = find_vio_slot_node(drc_name);
93	if (dn) {
94		*node_type = NODE_TYPE_VIO;
95		return dn;
96	}
97
98	return NULL;
99}
100
101/**
102 * find_php_slot - return hotplug slot structure for device node
103 *
104 * This routine will return the hotplug slot structure
105 * for a given device node. Note that built-in PCI slots
106 * may be dlpar-able, but not hot-pluggable, so this routine
107 * will return NULL for built-in PCI slots.
108 */
109static struct slot *find_php_slot(struct device_node *dn)
110{
111	struct list_head *tmp, *n;
112	struct slot *slot;
113
114	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
115		slot = list_entry(tmp, struct slot, rpaphp_slot_list);
116		if (slot->dn == dn)
117			return slot;
118	}
119
120	return NULL;
121}
122
123static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
124					struct device_node *dev_dn)
125{
126	struct pci_dev *tmp = NULL;
127	struct device_node *child_dn;
128
129	list_for_each_entry(tmp, &parent->devices, bus_list) {
130		child_dn = pci_device_to_OF_node(tmp);
131		if (child_dn == dev_dn)
132			return tmp;
133	}
134	return NULL;
135}
136
137static void dlpar_pci_add_bus(struct device_node *dn)
138{
139	struct pci_dn *pdn = PCI_DN(dn);
140	struct pci_controller *phb = pdn->phb;
141	struct pci_dev *dev = NULL;
142
143	eeh_add_device_tree_early(dn);
144
145	/* Add EADS device to PHB bus, adding new entry to bus->devices */
146	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
147	if (!dev) {
148		printk(KERN_ERR "%s: failed to create pci dev for %s\n",
149				__FUNCTION__, dn->full_name);
150		return;
151	}
152
153	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
154	    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
155		of_scan_pci_bridge(dn, dev);
156
157	pcibios_fixup_new_pci_devices(dev->subordinate,0);
158
159	/* Claim new bus resources */
160	pcibios_claim_one_bus(dev->bus);
161
162	/* ioremap() for child bus, which may or may not succeed */
163	remap_bus_range(dev->subordinate);
164
165	/* Add new devices to global lists.  Register in proc, sysfs. */
166	pci_bus_add_devices(phb->bus);
167}
168
169static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
170{
171	struct pci_dev *dev;
172	struct pci_controller *phb;
173
174	if (pcibios_find_pci_bus(dn))
175		return -EINVAL;
176
177	/* Add pci bus */
178	dlpar_pci_add_bus(dn);
179
180	/* Confirm new bridge dev was created */
181	phb = PCI_DN(dn)->phb;
182	dev = dlpar_find_new_dev(phb->bus, dn);
183
184	if (!dev) {
185		printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
186			drc_name);
187		return -EIO;
188	}
189
190	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
191		printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
192			__FUNCTION__, dev->hdr_type, drc_name);
193		return -EIO;
194	}
195
196	/* Add hotplug slot */
197	if (rpaphp_add_slot(dn)) {
198		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
199			__FUNCTION__, drc_name);
200		return -EIO;
201	}
202	return 0;
203}
204
205static int dlpar_remove_root_bus(struct pci_controller *phb)
206{
207	struct pci_bus *phb_bus;
208	int rc;
209
210	phb_bus = phb->bus;
211	if (!(list_empty(&phb_bus->children) &&
212	      list_empty(&phb_bus->devices))) {
213		return -EBUSY;
214	}
215
216	rc = pcibios_remove_root_bus(phb);
217	if (rc)
218		return -EIO;
219
220	device_unregister(phb_bus->bridge);
221	pci_remove_bus(phb_bus);
222
223	return 0;
224}
225
226static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
227{
228	struct slot *slot;
229	struct pci_dn *pdn;
230	int rc = 0;
231
232	if (!pcibios_find_pci_bus(dn))
233		return -EINVAL;
234
235	/* If pci slot is hotplugable, use hotplug to remove it */
236	slot = find_php_slot(dn);
237	if (slot) {
238		if (rpaphp_deregister_slot(slot)) {
239			printk(KERN_ERR
240				"%s: unable to remove hotplug slot %s\n",
241				__FUNCTION__, drc_name);
242			return -EIO;
243		}
244	}
245
246	pdn = dn->data;
247	BUG_ON(!pdn || !pdn->phb);
248	rc = dlpar_remove_root_bus(pdn->phb);
249	if (rc < 0)
250		return rc;
251
252	pdn->phb = NULL;
253
254	return 0;
255}
256
257static int dlpar_add_phb(char *drc_name, struct device_node *dn)
258{
259	struct pci_controller *phb;
260
261	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
262		/* PHB already exists */
263		return -EINVAL;
264	}
265
266	phb = init_phb_dynamic(dn);
267	if (!phb)
268		return -EIO;
269
270	if (rpaphp_add_slot(dn)) {
271		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
272			__FUNCTION__, drc_name);
273		return -EIO;
274	}
275	return 0;
276}
277
278static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
279{
280	if (vio_find_node(dn))
281		return -EINVAL;
282
283	if (!vio_register_device_node(dn)) {
284		printk(KERN_ERR
285			"%s: failed to register vio node %s\n",
286			__FUNCTION__, drc_name);
287		return -EIO;
288	}
289	return 0;
290}
291
292/**
293 * dlpar_add_slot - DLPAR add an I/O Slot
294 * @drc_name: drc-name of newly added slot
295 *
296 * Make the hotplug module and the kernel aware
297 * of a newly added I/O Slot.
298 * Return Codes -
299 * 0			Success
300 * -ENODEV		Not a valid drc_name
301 * -EINVAL		Slot already added
302 * -ERESTARTSYS		Signalled before obtaining lock
303 * -EIO			Internal PCI Error
304 */
305int dlpar_add_slot(char *drc_name)
306{
307	struct device_node *dn = NULL;
308	int node_type;
309	int rc = -EIO;
310
311	if (mutex_lock_interruptible(&rpadlpar_mutex))
312		return -ERESTARTSYS;
313
314	/* Find newly added node */
315	dn = find_dlpar_node(drc_name, &node_type);
316	if (!dn) {
317		rc = -ENODEV;
318		goto exit;
319	}
320
321	switch (node_type) {
322		case NODE_TYPE_VIO:
323			rc = dlpar_add_vio_slot(drc_name, dn);
324			break;
325		case NODE_TYPE_SLOT:
326			rc = dlpar_add_pci_slot(drc_name, dn);
327			break;
328		case NODE_TYPE_PHB:
329			rc = dlpar_add_phb(drc_name, dn);
330			break;
331	}
332
333	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
334exit:
335	mutex_unlock(&rpadlpar_mutex);
336	return rc;
337}
338
339/**
340 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
341 * @drc_name: drc-name of newly added slot
342 *
343 * Remove the kernel and hotplug representations
344 * of an I/O Slot.
345 * Return Codes:
346 * 0			Success
347 * -EINVAL		Vio dev doesn't exist
348 */
349static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
350{
351	struct vio_dev *vio_dev;
352
353	vio_dev = vio_find_node(dn);
354	if (!vio_dev)
355		return -EINVAL;
356
357	vio_unregister_device(vio_dev);
358	return 0;
359}
360
361/**
362 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
363 * @drc_name: drc-name of newly added slot
364 *
365 * Remove the kernel and hotplug representations
366 * of a PCI I/O Slot.
367 * Return Codes:
368 * 0			Success
369 * -ENODEV		Not a valid drc_name
370 * -EIO			Internal PCI Error
371 */
372int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
373{
374	struct pci_bus *bus;
375	struct slot *slot;
376
377	bus = pcibios_find_pci_bus(dn);
378	if (!bus)
379		return -EINVAL;
380
381	/* If pci slot is hotplugable, use hotplug to remove it */
382	slot = find_php_slot(dn);
383	if (slot) {
384		if (rpaphp_deregister_slot(slot)) {
385			printk(KERN_ERR
386				"%s: unable to remove hotplug slot %s\n",
387				__FUNCTION__, drc_name);
388			return -EIO;
389		}
390	} else
391		pcibios_remove_pci_devices(bus);
392
393	if (unmap_bus_range(bus)) {
394		printk(KERN_ERR "%s: failed to unmap bus range\n",
395			__FUNCTION__);
396		return -ERANGE;
397	}
398
399	BUG_ON(!bus->self);
400	pci_remove_bus_device(bus->self);
401	return 0;
402}
403
404/**
405 * dlpar_remove_slot - DLPAR remove an I/O Slot
406 * @drc_name: drc-name of newly added slot
407 *
408 * Remove the kernel and hotplug representations
409 * of an I/O Slot.
410 * Return Codes:
411 * 0			Success
412 * -ENODEV		Not a valid drc_name
413 * -EINVAL		Slot already removed
414 * -ERESTARTSYS		Signalled before obtaining lock
415 * -EIO			Internal Error
416 */
417int dlpar_remove_slot(char *drc_name)
418{
419	struct device_node *dn;
420	int node_type;
421	int rc = 0;
422
423	if (mutex_lock_interruptible(&rpadlpar_mutex))
424		return -ERESTARTSYS;
425
426	dn = find_dlpar_node(drc_name, &node_type);
427	if (!dn) {
428		rc = -ENODEV;
429		goto exit;
430	}
431
432	switch (node_type) {
433		case NODE_TYPE_VIO:
434			rc = dlpar_remove_vio_slot(drc_name, dn);
435			break;
436		case NODE_TYPE_PHB:
437			rc = dlpar_remove_phb(drc_name, dn);
438			break;
439		case NODE_TYPE_SLOT:
440			rc = dlpar_remove_pci_slot(drc_name, dn);
441			break;
442	}
443	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
444exit:
445	mutex_unlock(&rpadlpar_mutex);
446	return rc;
447}
448
449static inline int is_dlpar_capable(void)
450{
451	int rc = rtas_token("ibm,configure-connector");
452
453	return (int) (rc != RTAS_UNKNOWN_SERVICE);
454}
455
456int __init rpadlpar_io_init(void)
457{
458	int rc = 0;
459
460	if (!is_dlpar_capable()) {
461		printk(KERN_WARNING "%s: partition not DLPAR capable\n",
462			__FUNCTION__);
463		return -EPERM;
464	}
465
466	rc = dlpar_sysfs_init();
467	return rc;
468}
469
470void rpadlpar_io_exit(void)
471{
472	dlpar_sysfs_exit();
473	return;
474}
475
476module_init(rpadlpar_io_init);
477module_exit(rpadlpar_io_exit);
478MODULE_LICENSE("GPL");
479