Commit | Line | Data |
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1da177e4 LT |
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 <asm/pci-bridge.h> | |
20 | #include <asm/semaphore.h> | |
21 | #include <asm/rtas.h> | |
5eeb8c63 | 22 | #include <asm/vio.h> |
1da177e4 LT |
23 | #include "../pci.h" |
24 | #include "rpaphp.h" | |
25 | #include "rpadlpar.h" | |
26 | ||
27 | static DECLARE_MUTEX(rpadlpar_sem); | |
28 | ||
56d8456b JR |
29 | #define DLPAR_MODULE_NAME "rpadlpar_io" |
30 | ||
1da177e4 LT |
31 | #define NODE_TYPE_VIO 1 |
32 | #define NODE_TYPE_SLOT 2 | |
33 | #define NODE_TYPE_PHB 3 | |
34 | ||
5eeb8c63 | 35 | static struct device_node *find_vio_slot_node(char *drc_name) |
1da177e4 | 36 | { |
1da177e4 | 37 | struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); |
5eeb8c63 JR |
38 | struct device_node *dn = NULL; |
39 | char *name; | |
40 | int rc; | |
1da177e4 LT |
41 | |
42 | if (!parent) | |
43 | return NULL; | |
44 | ||
5eeb8c63 JR |
45 | while ((dn = of_get_next_child(parent, dn))) { |
46 | rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); | |
47 | if ((rc == 0) && (!strcmp(drc_name, name))) | |
48 | break; | |
1da177e4 LT |
49 | } |
50 | ||
5eeb8c63 | 51 | return dn; |
1da177e4 LT |
52 | } |
53 | ||
54 | /* Find dlpar-capable pci node that contains the specified name and type */ | |
55 | static struct device_node *find_php_slot_pci_node(char *drc_name, | |
56 | char *drc_type) | |
57 | { | |
58 | struct device_node *np = NULL; | |
59 | char *name; | |
60 | char *type; | |
61 | int rc; | |
62 | ||
63 | while ((np = of_find_node_by_type(np, "pci"))) { | |
64 | rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); | |
65 | if (rc == 0) | |
66 | if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) | |
67 | break; | |
68 | } | |
69 | ||
70 | return np; | |
71 | } | |
72 | ||
5eeb8c63 | 73 | static struct device_node *find_dlpar_node(char *drc_name, int *node_type) |
1da177e4 LT |
74 | { |
75 | struct device_node *dn; | |
76 | ||
77 | dn = find_php_slot_pci_node(drc_name, "SLOT"); | |
78 | if (dn) { | |
79 | *node_type = NODE_TYPE_SLOT; | |
80 | return dn; | |
81 | } | |
82 | ||
83 | dn = find_php_slot_pci_node(drc_name, "PHB"); | |
84 | if (dn) { | |
85 | *node_type = NODE_TYPE_PHB; | |
86 | return dn; | |
87 | } | |
88 | ||
5eeb8c63 | 89 | dn = find_vio_slot_node(drc_name); |
1da177e4 LT |
90 | if (dn) { |
91 | *node_type = NODE_TYPE_VIO; | |
92 | return dn; | |
93 | } | |
94 | ||
95 | return NULL; | |
96 | } | |
97 | ||
56d8456b | 98 | static struct slot *find_slot(struct device_node *dn) |
1da177e4 LT |
99 | { |
100 | struct list_head *tmp, *n; | |
101 | struct slot *slot; | |
102 | ||
103 | list_for_each_safe(tmp, n, &rpaphp_slot_head) { | |
104 | slot = list_entry(tmp, struct slot, rpaphp_slot_list); | |
56d8456b | 105 | if (slot->dn == dn) |
1da177e4 LT |
106 | return slot; |
107 | } | |
108 | ||
109 | return NULL; | |
110 | } | |
111 | ||
112 | static void rpadlpar_claim_one_bus(struct pci_bus *b) | |
113 | { | |
114 | struct list_head *ld; | |
115 | struct pci_bus *child_bus; | |
116 | ||
117 | for (ld = b->devices.next; ld != &b->devices; ld = ld->next) { | |
118 | struct pci_dev *dev = pci_dev_b(ld); | |
119 | int i; | |
120 | ||
121 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
122 | struct resource *r = &dev->resource[i]; | |
123 | ||
124 | if (r->parent || !r->start || !r->flags) | |
125 | continue; | |
126 | rpaphp_claim_resource(dev, i); | |
127 | } | |
128 | } | |
129 | ||
130 | list_for_each_entry(child_bus, &b->children, node) | |
131 | rpadlpar_claim_one_bus(child_bus); | |
132 | } | |
133 | ||
134 | static int pci_add_secondary_bus(struct device_node *dn, | |
135 | struct pci_dev *bridge_dev) | |
136 | { | |
1635317f PM |
137 | struct pci_dn *pdn = dn->data; |
138 | struct pci_controller *hose = pdn->phb; | |
1da177e4 LT |
139 | struct pci_bus *child; |
140 | u8 sec_busno; | |
141 | ||
142 | /* Get busno of downstream bus */ | |
143 | pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno); | |
144 | ||
145 | /* Allocate and add to children of bridge_dev->bus */ | |
146 | child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno); | |
147 | if (!child) { | |
148 | printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__); | |
149 | return -ENOMEM; | |
150 | } | |
151 | ||
152 | sprintf(child->name, "PCI Bus #%02x", child->number); | |
153 | ||
154 | /* Fixup subordinate bridge bases and resources */ | |
155 | pcibios_fixup_bus(child); | |
156 | ||
157 | /* Claim new bus resources */ | |
158 | rpadlpar_claim_one_bus(bridge_dev->bus); | |
159 | ||
160 | if (hose->last_busno < child->number) | |
161 | hose->last_busno = child->number; | |
162 | ||
1635317f | 163 | pdn->bussubno = child->number; |
1da177e4 LT |
164 | |
165 | /* ioremap() for child bus, which may or may not succeed */ | |
166 | remap_bus_range(child); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
0945cd5f JR |
171 | static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, |
172 | struct device_node *dev_dn) | |
173 | { | |
174 | struct pci_dev *tmp = NULL; | |
175 | struct device_node *child_dn; | |
176 | ||
177 | list_for_each_entry(tmp, &parent->devices, bus_list) { | |
178 | child_dn = pci_device_to_OF_node(tmp); | |
179 | if (child_dn == dev_dn) | |
180 | return tmp; | |
181 | } | |
182 | return NULL; | |
183 | } | |
184 | ||
1da177e4 LT |
185 | static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn) |
186 | { | |
1635317f PM |
187 | struct pci_dn *pdn = dn->data; |
188 | struct pci_controller *hose = pdn->phb; | |
1da177e4 LT |
189 | struct pci_dev *dev = NULL; |
190 | ||
191 | /* Scan phb bus for EADS device, adding new one to bus->devices */ | |
1635317f | 192 | if (!pci_scan_single_device(hose->bus, pdn->devfn)) { |
1da177e4 LT |
193 | printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__); |
194 | return NULL; | |
195 | } | |
196 | ||
197 | /* Add new devices to global lists. Register in proc, sysfs. */ | |
198 | pci_bus_add_devices(hose->bus); | |
199 | ||
200 | /* Confirm new bridge dev was created */ | |
0945cd5f JR |
201 | dev = dlpar_find_new_dev(hose->bus, dn); |
202 | if (dev) { | |
203 | if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { | |
204 | printk(KERN_ERR "%s: unexpected header type %d\n", | |
205 | __FUNCTION__, dev->hdr_type); | |
206 | return NULL; | |
207 | } | |
1da177e4 | 208 | |
0945cd5f JR |
209 | if (pci_add_secondary_bus(dn, dev)) |
210 | return NULL; | |
1da177e4 LT |
211 | } |
212 | ||
1da177e4 LT |
213 | return dev; |
214 | } | |
215 | ||
940903c5 | 216 | static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) |
1da177e4 LT |
217 | { |
218 | struct pci_dev *dev; | |
940903c5 | 219 | int rc; |
1da177e4 | 220 | |
56d8456b JR |
221 | if (rpaphp_find_pci_bus(dn)) |
222 | return -EINVAL; | |
223 | ||
1da177e4 LT |
224 | /* Add pci bus */ |
225 | dev = dlpar_pci_add_bus(dn); | |
226 | if (!dev) { | |
227 | printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__, | |
228 | drc_name); | |
229 | return -EIO; | |
230 | } | |
231 | ||
940903c5 JR |
232 | if (dn->child) { |
233 | rc = rpaphp_config_pci_adapter(dev->subordinate); | |
234 | if (rc < 0) { | |
235 | printk(KERN_ERR "%s: unable to enable slot %s\n", | |
236 | __FUNCTION__, drc_name); | |
237 | return -EIO; | |
238 | } | |
239 | } | |
240 | ||
5eeb8c63 JR |
241 | /* Add hotplug slot */ |
242 | if (rpaphp_add_slot(dn)) { | |
243 | printk(KERN_ERR "%s: unable to add hotplug slot %s\n", | |
244 | __FUNCTION__, drc_name); | |
245 | return -EIO; | |
246 | } | |
1da177e4 LT |
247 | return 0; |
248 | } | |
249 | ||
250 | static int dlpar_remove_root_bus(struct pci_controller *phb) | |
251 | { | |
252 | struct pci_bus *phb_bus; | |
253 | int rc; | |
254 | ||
255 | phb_bus = phb->bus; | |
256 | if (!(list_empty(&phb_bus->children) && | |
257 | list_empty(&phb_bus->devices))) { | |
258 | return -EBUSY; | |
259 | } | |
260 | ||
261 | rc = pcibios_remove_root_bus(phb); | |
262 | if (rc) | |
263 | return -EIO; | |
264 | ||
265 | device_unregister(phb_bus->bridge); | |
266 | pci_remove_bus(phb_bus); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
56d8456b | 271 | static int dlpar_remove_phb(char *drc_name, struct device_node *dn) |
1da177e4 | 272 | { |
56d8456b | 273 | struct slot *slot; |
1635317f | 274 | struct pci_dn *pdn; |
1da177e4 LT |
275 | int rc = 0; |
276 | ||
56d8456b JR |
277 | if (!rpaphp_find_pci_bus(dn)) |
278 | return -EINVAL; | |
1da177e4 | 279 | |
56d8456b JR |
280 | slot = find_slot(dn); |
281 | if (slot) { | |
282 | /* Remove hotplug slot */ | |
283 | if (rpaphp_remove_slot(slot)) { | |
284 | printk(KERN_ERR | |
285 | "%s: unable to remove hotplug slot %s\n", | |
286 | __FUNCTION__, drc_name); | |
287 | return -EIO; | |
288 | } | |
1da177e4 LT |
289 | } |
290 | ||
1635317f PM |
291 | pdn = dn->data; |
292 | BUG_ON(!pdn || !pdn->phb); | |
293 | rc = dlpar_remove_root_bus(pdn->phb); | |
1da177e4 LT |
294 | if (rc < 0) |
295 | return rc; | |
296 | ||
1635317f | 297 | pdn->phb = NULL; |
56d8456b | 298 | |
1da177e4 LT |
299 | return 0; |
300 | } | |
301 | ||
5eeb8c63 | 302 | static int dlpar_add_phb(char *drc_name, struct device_node *dn) |
1da177e4 LT |
303 | { |
304 | struct pci_controller *phb; | |
305 | ||
1635317f | 306 | if (PCI_DN(dn)->phb) { |
56d8456b JR |
307 | /* PHB already exists */ |
308 | return -EINVAL; | |
309 | } | |
310 | ||
1da177e4 LT |
311 | phb = init_phb_dynamic(dn); |
312 | if (!phb) | |
56d8456b | 313 | return -EIO; |
1da177e4 | 314 | |
5eeb8c63 JR |
315 | if (rpaphp_add_slot(dn)) { |
316 | printk(KERN_ERR "%s: unable to add hotplug slot %s\n", | |
317 | __FUNCTION__, drc_name); | |
318 | return -EIO; | |
319 | } | |
1da177e4 LT |
320 | return 0; |
321 | } | |
322 | ||
56d8456b JR |
323 | static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) |
324 | { | |
325 | if (vio_find_node(dn)) | |
326 | return -EINVAL; | |
327 | ||
328 | if (!vio_register_device_node(dn)) { | |
329 | printk(KERN_ERR | |
330 | "%s: failed to register vio node %s\n", | |
331 | __FUNCTION__, drc_name); | |
332 | return -EIO; | |
333 | } | |
334 | return 0; | |
335 | } | |
336 | ||
1da177e4 LT |
337 | /** |
338 | * dlpar_add_slot - DLPAR add an I/O Slot | |
339 | * @drc_name: drc-name of newly added slot | |
340 | * | |
341 | * Make the hotplug module and the kernel aware | |
342 | * of a newly added I/O Slot. | |
343 | * Return Codes - | |
344 | * 0 Success | |
345 | * -ENODEV Not a valid drc_name | |
346 | * -EINVAL Slot already added | |
347 | * -ERESTARTSYS Signalled before obtaining lock | |
348 | * -EIO Internal PCI Error | |
349 | */ | |
350 | int dlpar_add_slot(char *drc_name) | |
351 | { | |
352 | struct device_node *dn = NULL; | |
353 | int node_type; | |
56d8456b | 354 | int rc = -EIO; |
1da177e4 LT |
355 | |
356 | if (down_interruptible(&rpadlpar_sem)) | |
357 | return -ERESTARTSYS; | |
358 | ||
5eeb8c63 JR |
359 | /* Find newly added node */ |
360 | dn = find_dlpar_node(drc_name, &node_type); | |
1da177e4 LT |
361 | if (!dn) { |
362 | rc = -ENODEV; | |
363 | goto exit; | |
364 | } | |
365 | ||
366 | switch (node_type) { | |
367 | case NODE_TYPE_VIO: | |
56d8456b | 368 | rc = dlpar_add_vio_slot(drc_name, dn); |
1da177e4 LT |
369 | break; |
370 | case NODE_TYPE_SLOT: | |
371 | rc = dlpar_add_pci_slot(drc_name, dn); | |
372 | break; | |
373 | case NODE_TYPE_PHB: | |
5eeb8c63 | 374 | rc = dlpar_add_phb(drc_name, dn); |
1da177e4 | 375 | break; |
1da177e4 LT |
376 | } |
377 | ||
56d8456b | 378 | printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); |
1da177e4 LT |
379 | exit: |
380 | up(&rpadlpar_sem); | |
381 | return rc; | |
382 | } | |
383 | ||
384 | /** | |
385 | * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot | |
386 | * @drc_name: drc-name of newly added slot | |
387 | * | |
388 | * Remove the kernel and hotplug representations | |
389 | * of an I/O Slot. | |
390 | * Return Codes: | |
391 | * 0 Success | |
56d8456b | 392 | * -EINVAL Vio dev doesn't exist |
1da177e4 | 393 | */ |
56d8456b | 394 | static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) |
1da177e4 | 395 | { |
5eeb8c63 | 396 | struct vio_dev *vio_dev; |
1da177e4 | 397 | |
5eeb8c63 | 398 | vio_dev = vio_find_node(dn); |
56d8456b JR |
399 | if (!vio_dev) |
400 | return -EINVAL; | |
5eeb8c63 JR |
401 | |
402 | vio_unregister_device(vio_dev); | |
1da177e4 LT |
403 | return 0; |
404 | } | |
405 | ||
406 | /** | |
407 | * dlpar_remove_slot - DLPAR remove a PCI I/O Slot | |
408 | * @drc_name: drc-name of newly added slot | |
409 | * | |
410 | * Remove the kernel and hotplug representations | |
411 | * of a PCI I/O Slot. | |
412 | * Return Codes: | |
413 | * 0 Success | |
414 | * -ENODEV Not a valid drc_name | |
415 | * -EIO Internal PCI Error | |
416 | */ | |
56d8456b | 417 | int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) |
1da177e4 | 418 | { |
56d8456b JR |
419 | struct pci_bus *bus; |
420 | struct slot *slot; | |
1da177e4 | 421 | |
56d8456b JR |
422 | bus = rpaphp_find_pci_bus(dn); |
423 | if (!bus) | |
424 | return -EINVAL; | |
425 | ||
426 | slot = find_slot(dn); | |
427 | if (slot) { | |
428 | /* Remove hotplug slot */ | |
429 | if (rpaphp_remove_slot(slot)) { | |
430 | printk(KERN_ERR | |
431 | "%s: unable to remove hotplug slot %s\n", | |
432 | __FUNCTION__, drc_name); | |
433 | return -EIO; | |
434 | } | |
1da177e4 LT |
435 | } |
436 | ||
9c209c91 JR |
437 | if (unmap_bus_range(bus)) { |
438 | printk(KERN_ERR "%s: failed to unmap bus range\n", | |
439 | __FUNCTION__); | |
440 | return -ERANGE; | |
1da177e4 | 441 | } |
9c209c91 JR |
442 | |
443 | BUG_ON(!bus->self); | |
444 | pci_remove_bus_device(bus->self); | |
1da177e4 LT |
445 | return 0; |
446 | } | |
447 | ||
448 | /** | |
449 | * dlpar_remove_slot - DLPAR remove an I/O Slot | |
450 | * @drc_name: drc-name of newly added slot | |
451 | * | |
452 | * Remove the kernel and hotplug representations | |
453 | * of an I/O Slot. | |
454 | * Return Codes: | |
455 | * 0 Success | |
456 | * -ENODEV Not a valid drc_name | |
457 | * -EINVAL Slot already removed | |
458 | * -ERESTARTSYS Signalled before obtaining lock | |
459 | * -EIO Internal Error | |
460 | */ | |
461 | int dlpar_remove_slot(char *drc_name) | |
462 | { | |
5eeb8c63 | 463 | struct device_node *dn; |
5eeb8c63 | 464 | int node_type; |
1da177e4 LT |
465 | int rc = 0; |
466 | ||
467 | if (down_interruptible(&rpadlpar_sem)) | |
468 | return -ERESTARTSYS; | |
469 | ||
5eeb8c63 JR |
470 | dn = find_dlpar_node(drc_name, &node_type); |
471 | if (!dn) { | |
1da177e4 LT |
472 | rc = -ENODEV; |
473 | goto exit; | |
474 | } | |
475 | ||
56d8456b JR |
476 | switch (node_type) { |
477 | case NODE_TYPE_VIO: | |
478 | rc = dlpar_remove_vio_slot(drc_name, dn); | |
479 | break; | |
480 | case NODE_TYPE_PHB: | |
481 | rc = dlpar_remove_phb(drc_name, dn); | |
482 | break; | |
483 | case NODE_TYPE_SLOT: | |
484 | rc = dlpar_remove_pci_slot(drc_name, dn); | |
485 | break; | |
1da177e4 | 486 | } |
56d8456b | 487 | printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); |
1da177e4 LT |
488 | exit: |
489 | up(&rpadlpar_sem); | |
490 | return rc; | |
491 | } | |
492 | ||
493 | static inline int is_dlpar_capable(void) | |
494 | { | |
495 | int rc = rtas_token("ibm,configure-connector"); | |
496 | ||
497 | return (int) (rc != RTAS_UNKNOWN_SERVICE); | |
498 | } | |
499 | ||
500 | int __init rpadlpar_io_init(void) | |
501 | { | |
502 | int rc = 0; | |
503 | ||
504 | if (!is_dlpar_capable()) { | |
505 | printk(KERN_WARNING "%s: partition not DLPAR capable\n", | |
506 | __FUNCTION__); | |
507 | return -EPERM; | |
508 | } | |
509 | ||
510 | rc = dlpar_sysfs_init(); | |
511 | return rc; | |
512 | } | |
513 | ||
514 | void rpadlpar_io_exit(void) | |
515 | { | |
516 | dlpar_sysfs_exit(); | |
517 | return; | |
518 | } | |
519 | ||
520 | module_init(rpadlpar_io_init); | |
521 | module_exit(rpadlpar_io_exit); | |
522 | MODULE_LICENSE("GPL"); |