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
18 #undef DEBUG
19
20 #include <linux/init.h>
21 #include <linux/pci.h>
22 #include <linux/string.h>
23 #include <linux/vmalloc.h>
24
25 #include <asm/pci-bridge.h>
26 #include <linux/mutex.h>
27 #include <asm/rtas.h>
28 #include <asm/vio.h>
29
30 #include "../pci.h"
31 #include "rpaphp.h"
32 #include "rpadlpar.h"
33
34 static DEFINE_MUTEX(rpadlpar_mutex);
35
36 #define DLPAR_MODULE_NAME "rpadlpar_io"
37
38 #define NODE_TYPE_VIO 1
39 #define NODE_TYPE_SLOT 2
40 #define NODE_TYPE_PHB 3
41
find_vio_slot_node(char * drc_name)42 static struct device_node *find_vio_slot_node(char *drc_name)
43 {
44 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
45 struct device_node *dn = NULL;
46 char *name;
47 int rc;
48
49 if (!parent)
50 return NULL;
51
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)))
55 break;
56 }
57
58 return dn;
59 }
60
61 /* Find dlpar-capable pci node that contains the specified name and type */
find_php_slot_pci_node(char * drc_name,char * drc_type)62 static struct device_node *find_php_slot_pci_node(char *drc_name,
63 char *drc_type)
64 {
65 struct device_node *np = NULL;
66 char *name;
67 char *type;
68 int rc;
69
70 while ((np = of_find_node_by_name(np, "pci"))) {
71 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
72 if (rc == 0)
73 if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
74 break;
75 }
76
77 return np;
78 }
79
find_dlpar_node(char * drc_name,int * node_type)80 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
81 {
82 struct device_node *dn;
83
84 dn = find_php_slot_pci_node(drc_name, "SLOT");
85 if (dn) {
86 *node_type = NODE_TYPE_SLOT;
87 return dn;
88 }
89
90 dn = find_php_slot_pci_node(drc_name, "PHB");
91 if (dn) {
92 *node_type = NODE_TYPE_PHB;
93 return dn;
94 }
95
96 dn = find_vio_slot_node(drc_name);
97 if (dn) {
98 *node_type = NODE_TYPE_VIO;
99 return dn;
100 }
101
102 return NULL;
103 }
104
105 /**
106 * find_php_slot - return hotplug slot structure for device node
107 * @dn: target &device_node
108 *
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.
113 */
find_php_slot(struct device_node * dn)114 static struct slot *find_php_slot(struct device_node *dn)
115 {
116 struct list_head *tmp, *n;
117 struct slot *slot;
118
119 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
120 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
121 if (slot->dn == dn)
122 return slot;
123 }
124
125 return NULL;
126 }
127
dlpar_find_new_dev(struct pci_bus * parent,struct device_node * dev_dn)128 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
129 struct device_node *dev_dn)
130 {
131 struct pci_dev *tmp = NULL;
132 struct device_node *child_dn;
133
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)
137 return tmp;
138 }
139 return NULL;
140 }
141
dlpar_pci_add_bus(struct device_node * dn)142 static void dlpar_pci_add_bus(struct device_node *dn)
143 {
144 struct pci_dn *pdn = PCI_DN(dn);
145 struct pci_controller *phb = pdn->phb;
146 struct pci_dev *dev = NULL;
147
148 eeh_add_device_tree_early(dn);
149
150 /* Add EADS device to PHB bus, adding new entry to bus->devices */
151 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
152 if (!dev) {
153 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
154 __func__, dn->full_name);
155 return;
156 }
157
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);
162
163 /* Map IO space for child bus, which may or may not succeed */
164 pcibios_map_io_space(dev->subordinate);
165
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
169 * properly added
170 */
171 pcibios_finish_adding_to_bus(phb->bus);
172 }
173
dlpar_add_pci_slot(char * drc_name,struct device_node * dn)174 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
175 {
176 struct pci_dev *dev;
177 struct pci_controller *phb;
178
179 if (pcibios_find_pci_bus(dn))
180 return -EINVAL;
181
182 /* Add pci bus */
183 dlpar_pci_add_bus(dn);
184
185 /* Confirm new bridge dev was created */
186 phb = PCI_DN(dn)->phb;
187 dev = dlpar_find_new_dev(phb->bus, dn);
188
189 if (!dev) {
190 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
191 drc_name);
192 return -EIO;
193 }
194
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);
198 return -EIO;
199 }
200
201 /* Add hotplug slot */
202 if (rpaphp_add_slot(dn)) {
203 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
204 __func__, drc_name);
205 return -EIO;
206 }
207 return 0;
208 }
209
dlpar_remove_phb(char * drc_name,struct device_node * dn)210 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
211 {
212 struct slot *slot;
213 struct pci_dn *pdn;
214 int rc = 0;
215
216 if (!pcibios_find_pci_bus(dn))
217 return -EINVAL;
218
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",
223 __func__, drc_name);
224 return -EIO;
225 }
226
227 pdn = dn->data;
228 BUG_ON(!pdn || !pdn->phb);
229 rc = remove_phb_dynamic(pdn->phb);
230 if (rc < 0)
231 return rc;
232
233 pdn->phb = NULL;
234
235 return 0;
236 }
237
dlpar_add_phb(char * drc_name,struct device_node * dn)238 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
239 {
240 struct pci_controller *phb;
241
242 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
243 /* PHB already exists */
244 return -EINVAL;
245 }
246
247 phb = init_phb_dynamic(dn);
248 if (!phb)
249 return -EIO;
250
251 if (rpaphp_add_slot(dn)) {
252 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
253 __func__, drc_name);
254 return -EIO;
255 }
256 return 0;
257 }
258
dlpar_add_vio_slot(char * drc_name,struct device_node * dn)259 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
260 {
261 if (vio_find_node(dn))
262 return -EINVAL;
263
264 if (!vio_register_device_node(dn)) {
265 printk(KERN_ERR
266 "%s: failed to register vio node %s\n",
267 __func__, drc_name);
268 return -EIO;
269 }
270 return 0;
271 }
272
273 /**
274 * dlpar_add_slot - DLPAR add an I/O Slot
275 * @drc_name: drc-name of newly added slot
276 *
277 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
278 * Return Codes:
279 * 0 Success
280 * -ENODEV Not a valid drc_name
281 * -EINVAL Slot already added
282 * -ERESTARTSYS Signalled before obtaining lock
283 * -EIO Internal PCI Error
284 */
dlpar_add_slot(char * drc_name)285 int dlpar_add_slot(char *drc_name)
286 {
287 struct device_node *dn = NULL;
288 int node_type;
289 int rc = -EIO;
290
291 if (mutex_lock_interruptible(&rpadlpar_mutex))
292 return -ERESTARTSYS;
293
294 /* Find newly added node */
295 dn = find_dlpar_node(drc_name, &node_type);
296 if (!dn) {
297 rc = -ENODEV;
298 goto exit;
299 }
300
301 switch (node_type) {
302 case NODE_TYPE_VIO:
303 rc = dlpar_add_vio_slot(drc_name, dn);
304 break;
305 case NODE_TYPE_SLOT:
306 rc = dlpar_add_pci_slot(drc_name, dn);
307 break;
308 case NODE_TYPE_PHB:
309 rc = dlpar_add_phb(drc_name, dn);
310 break;
311 }
312
313 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
314 exit:
315 mutex_unlock(&rpadlpar_mutex);
316 return rc;
317 }
318
319 /**
320 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
321 * @drc_name: drc-name of newly added slot
322 * @dn: &device_node
323 *
324 * Remove the kernel and hotplug representations of an I/O Slot.
325 * Return Codes:
326 * 0 Success
327 * -EINVAL Vio dev doesn't exist
328 */
dlpar_remove_vio_slot(char * drc_name,struct device_node * dn)329 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
330 {
331 struct vio_dev *vio_dev;
332
333 vio_dev = vio_find_node(dn);
334 if (!vio_dev)
335 return -EINVAL;
336
337 vio_unregister_device(vio_dev);
338 return 0;
339 }
340
341 /**
342 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
343 * @drc_name: drc-name of newly added slot
344 * @dn: &device_node
345 *
346 * Remove the kernel and hotplug representations of a PCI I/O Slot.
347 * Return Codes:
348 * 0 Success
349 * -ENODEV Not a valid drc_name
350 * -EIO Internal PCI Error
351 */
dlpar_remove_pci_slot(char * drc_name,struct device_node * dn)352 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
353 {
354 struct pci_bus *bus;
355 struct slot *slot;
356
357 bus = pcibios_find_pci_bus(dn);
358 if (!bus)
359 return -EINVAL;
360
361 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
362 bus->self ? pci_name(bus->self) : "<!PHB!>");
363
364 slot = find_php_slot(dn);
365 if (slot) {
366 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
367 pci_domain_nr(bus), bus->number);
368
369 if (rpaphp_deregister_slot(slot)) {
370 printk(KERN_ERR
371 "%s: unable to remove hotplug slot %s\n",
372 __func__, drc_name);
373 return -EIO;
374 }
375 }
376
377 /* Remove all devices below slot */
378 pcibios_remove_pci_devices(bus);
379
380 /* Unmap PCI IO space */
381 if (pcibios_unmap_io_space(bus)) {
382 printk(KERN_ERR "%s: failed to unmap bus range\n",
383 __func__);
384 return -ERANGE;
385 }
386
387 /* Remove the EADS bridge device itself */
388 BUG_ON(!bus->self);
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);
392
393 return 0;
394 }
395
396 /**
397 * dlpar_remove_slot - DLPAR remove an I/O Slot
398 * @drc_name: drc-name of newly added slot
399 *
400 * Remove the kernel and hotplug representations of an I/O Slot.
401 * Return Codes:
402 * 0 Success
403 * -ENODEV Not a valid drc_name
404 * -EINVAL Slot already removed
405 * -ERESTARTSYS Signalled before obtaining lock
406 * -EIO Internal Error
407 */
dlpar_remove_slot(char * drc_name)408 int dlpar_remove_slot(char *drc_name)
409 {
410 struct device_node *dn;
411 int node_type;
412 int rc = 0;
413
414 if (mutex_lock_interruptible(&rpadlpar_mutex))
415 return -ERESTARTSYS;
416
417 dn = find_dlpar_node(drc_name, &node_type);
418 if (!dn) {
419 rc = -ENODEV;
420 goto exit;
421 }
422
423 switch (node_type) {
424 case NODE_TYPE_VIO:
425 rc = dlpar_remove_vio_slot(drc_name, dn);
426 break;
427 case NODE_TYPE_PHB:
428 rc = dlpar_remove_phb(drc_name, dn);
429 break;
430 case NODE_TYPE_SLOT:
431 rc = dlpar_remove_pci_slot(drc_name, dn);
432 break;
433 }
434 vm_unmap_aliases();
435
436 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
437 exit:
438 mutex_unlock(&rpadlpar_mutex);
439 return rc;
440 }
441
is_dlpar_capable(void)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
rpadlpar_io_init(void)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 __func__);
456 return -EPERM;
457 }
458
459 rc = dlpar_sysfs_init();
460 return rc;
461 }
462
rpadlpar_io_exit(void)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