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 <asm/semaphore.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 
30 static DECLARE_MUTEX(rpadlpar_sem);
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 
38 static 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 */
58 static 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_type(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 
76 static 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 static struct slot *find_slot(struct device_node *dn)
102 {
103 	struct list_head *tmp, *n;
104 	struct slot *slot;
105 
106         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
107                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
108                 if (slot->dn == dn)
109                         return slot;
110         }
111 
112         return NULL;
113 }
114 
115 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
116 					struct device_node *dev_dn)
117 {
118 	struct pci_dev *tmp = NULL;
119 	struct device_node *child_dn;
120 
121 	list_for_each_entry(tmp, &parent->devices, bus_list) {
122 		child_dn = pci_device_to_OF_node(tmp);
123 		if (child_dn == dev_dn)
124 			return tmp;
125 	}
126 	return NULL;
127 }
128 
129 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
130 {
131 	struct pci_dn *pdn = dn->data;
132 	struct pci_controller *phb = pdn->phb;
133 	struct pci_dev *dev = NULL;
134 
135 	eeh_add_device_tree_early(dn);
136 
137 	/* Add EADS device to PHB bus, adding new entry to bus->devices */
138 	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
139 	if (!dev) {
140 		printk(KERN_ERR "%s: failed to create pci dev for %s\n",
141 				__FUNCTION__, dn->full_name);
142 		return NULL;
143 	}
144 
145 	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
146 	    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
147 		of_scan_pci_bridge(dn, dev);
148 
149 	rpaphp_init_new_devs(dev->subordinate);
150 
151 	/* Claim new bus resources */
152 	pcibios_claim_one_bus(dev->bus);
153 
154 	/* ioremap() for child bus, which may or may not succeed */
155 	(void) remap_bus_range(dev->bus);
156 
157 	/* Add new devices to global lists.  Register in proc, sysfs. */
158 	pci_bus_add_devices(phb->bus);
159 
160 	/* Confirm new bridge dev was created */
161 	dev = dlpar_find_new_dev(phb->bus, dn);
162 	if (dev) {
163 		if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
164 			printk(KERN_ERR "%s: unexpected header type %d\n",
165 				__FUNCTION__, dev->hdr_type);
166 			return NULL;
167 		}
168 	}
169 
170 	return dev;
171 }
172 
173 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
174 {
175 	struct pci_dev *dev;
176 
177 	if (rpaphp_find_pci_bus(dn))
178 		return -EINVAL;
179 
180 	/* Add pci bus */
181 	dev = dlpar_pci_add_bus(dn);
182 	if (!dev) {
183 		printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
184 			drc_name);
185 		return -EIO;
186 	}
187 
188 	/* Add hotplug slot */
189 	if (rpaphp_add_slot(dn)) {
190 		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
191 			__FUNCTION__, drc_name);
192 		return -EIO;
193 	}
194 	return 0;
195 }
196 
197 static int dlpar_remove_root_bus(struct pci_controller *phb)
198 {
199 	struct pci_bus *phb_bus;
200 	int rc;
201 
202 	phb_bus = phb->bus;
203 	if (!(list_empty(&phb_bus->children) &&
204 	      list_empty(&phb_bus->devices))) {
205 		return -EBUSY;
206 	}
207 
208 	rc = pcibios_remove_root_bus(phb);
209 	if (rc)
210 		return -EIO;
211 
212 	device_unregister(phb_bus->bridge);
213 	pci_remove_bus(phb_bus);
214 
215 	return 0;
216 }
217 
218 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
219 {
220 	struct slot *slot;
221 	struct pci_dn *pdn;
222 	int rc = 0;
223 
224 	if (!rpaphp_find_pci_bus(dn))
225 		return -EINVAL;
226 
227 	slot = find_slot(dn);
228 	if (slot) {
229 		/* Remove hotplug slot */
230 		if (rpaphp_remove_slot(slot)) {
231 			printk(KERN_ERR
232 				"%s: unable to remove hotplug slot %s\n",
233 				__FUNCTION__, drc_name);
234 			return -EIO;
235 		}
236 	}
237 
238 	pdn = dn->data;
239 	BUG_ON(!pdn || !pdn->phb);
240 	rc = dlpar_remove_root_bus(pdn->phb);
241 	if (rc < 0)
242 		return rc;
243 
244 	pdn->phb = NULL;
245 
246 	return 0;
247 }
248 
249 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
250 {
251 	struct pci_controller *phb;
252 
253 	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
254 		/* PHB already exists */
255 		return -EINVAL;
256 	}
257 
258 	phb = init_phb_dynamic(dn);
259 	if (!phb)
260 		return -EIO;
261 
262 	if (rpaphp_add_slot(dn)) {
263 		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
264 			__FUNCTION__, drc_name);
265 		return -EIO;
266 	}
267 	return 0;
268 }
269 
270 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
271 {
272 	if (vio_find_node(dn))
273 		return -EINVAL;
274 
275 	if (!vio_register_device_node(dn)) {
276 		printk(KERN_ERR
277 			"%s: failed to register vio node %s\n",
278 			__FUNCTION__, drc_name);
279 		return -EIO;
280 	}
281 	return 0;
282 }
283 
284 /**
285  * dlpar_add_slot - DLPAR add an I/O Slot
286  * @drc_name: drc-name of newly added slot
287  *
288  * Make the hotplug module and the kernel aware
289  * of a newly added I/O Slot.
290  * Return Codes -
291  * 0			Success
292  * -ENODEV		Not a valid drc_name
293  * -EINVAL		Slot already added
294  * -ERESTARTSYS		Signalled before obtaining lock
295  * -EIO			Internal PCI Error
296  */
297 int dlpar_add_slot(char *drc_name)
298 {
299 	struct device_node *dn = NULL;
300 	int node_type;
301 	int rc = -EIO;
302 
303 	if (down_interruptible(&rpadlpar_sem))
304 		return -ERESTARTSYS;
305 
306 	/* Find newly added node */
307 	dn = find_dlpar_node(drc_name, &node_type);
308 	if (!dn) {
309 		rc = -ENODEV;
310 		goto exit;
311 	}
312 
313 	switch (node_type) {
314 		case NODE_TYPE_VIO:
315 			rc = dlpar_add_vio_slot(drc_name, dn);
316 			break;
317 		case NODE_TYPE_SLOT:
318 			rc = dlpar_add_pci_slot(drc_name, dn);
319 			break;
320 		case NODE_TYPE_PHB:
321 			rc = dlpar_add_phb(drc_name, dn);
322 			break;
323 	}
324 
325 	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
326 exit:
327 	up(&rpadlpar_sem);
328 	return rc;
329 }
330 
331 /**
332  * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
333  * @drc_name: drc-name of newly added slot
334  *
335  * Remove the kernel and hotplug representations
336  * of an I/O Slot.
337  * Return Codes:
338  * 0			Success
339  * -EINVAL		Vio dev doesn't exist
340  */
341 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
342 {
343 	struct vio_dev *vio_dev;
344 
345 	vio_dev = vio_find_node(dn);
346 	if (!vio_dev)
347 		return -EINVAL;
348 
349 	vio_unregister_device(vio_dev);
350 	return 0;
351 }
352 
353 /**
354  * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
355  * @drc_name: drc-name of newly added slot
356  *
357  * Remove the kernel and hotplug representations
358  * of a PCI I/O Slot.
359  * Return Codes:
360  * 0			Success
361  * -ENODEV		Not a valid drc_name
362  * -EIO			Internal PCI Error
363  */
364 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
365 {
366 	struct pci_bus *bus;
367 	struct slot *slot;
368 
369 	bus = rpaphp_find_pci_bus(dn);
370 	if (!bus)
371 		return -EINVAL;
372 
373 	slot = find_slot(dn);
374 	if (slot) {
375 		/* Remove hotplug slot */
376 		if (rpaphp_remove_slot(slot)) {
377 			printk(KERN_ERR
378 				"%s: unable to remove hotplug slot %s\n",
379 				__FUNCTION__, drc_name);
380 			return -EIO;
381 		}
382 	} else {
383 		rpaphp_unconfig_pci_adapter(bus);
384 	}
385 
386 	if (unmap_bus_range(bus)) {
387 		printk(KERN_ERR "%s: failed to unmap bus range\n",
388 			__FUNCTION__);
389 		return -ERANGE;
390 	}
391 
392 	BUG_ON(!bus->self);
393 	pci_remove_bus_device(bus->self);
394 	return 0;
395 }
396 
397 /**
398  * dlpar_remove_slot - DLPAR remove an I/O Slot
399  * @drc_name: drc-name of newly added slot
400  *
401  * Remove the kernel and hotplug representations
402  * of an I/O Slot.
403  * Return Codes:
404  * 0			Success
405  * -ENODEV		Not a valid drc_name
406  * -EINVAL		Slot already removed
407  * -ERESTARTSYS		Signalled before obtaining lock
408  * -EIO			Internal Error
409  */
410 int dlpar_remove_slot(char *drc_name)
411 {
412 	struct device_node *dn;
413 	int node_type;
414 	int rc = 0;
415 
416 	if (down_interruptible(&rpadlpar_sem))
417 		return -ERESTARTSYS;
418 
419 	dn = find_dlpar_node(drc_name, &node_type);
420 	if (!dn) {
421 		rc = -ENODEV;
422 		goto exit;
423 	}
424 
425 	switch (node_type) {
426 		case NODE_TYPE_VIO:
427 			rc = dlpar_remove_vio_slot(drc_name, dn);
428 			break;
429 		case NODE_TYPE_PHB:
430 			rc = dlpar_remove_phb(drc_name, dn);
431 			break;
432 		case NODE_TYPE_SLOT:
433 			rc = dlpar_remove_pci_slot(drc_name, dn);
434 			break;
435 	}
436 	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
437 exit:
438 	up(&rpadlpar_sem);
439 	return rc;
440 }
441 
442 static inline int is_dlpar_capable(void)
443 {
444 	int rc = rtas_token("ibm,configure-connector");
445 
446 	return (int) (rc != RTAS_UNKNOWN_SERVICE);
447 }
448 
449 int __init rpadlpar_io_init(void)
450 {
451 	int rc = 0;
452 
453 	if (!is_dlpar_capable()) {
454 		printk(KERN_WARNING "%s: partition not DLPAR capable\n",
455 			__FUNCTION__);
456 		return -EPERM;
457 	}
458 
459 	rc = dlpar_sysfs_init();
460 	return rc;
461 }
462 
463 void rpadlpar_io_exit(void)
464 {
465 	dlpar_sysfs_exit();
466 	return;
467 }
468 
469 module_init(rpadlpar_io_init);
470 module_exit(rpadlpar_io_exit);
471 MODULE_LICENSE("GPL");
472