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