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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * pSeries_reconfig.c - support for dynamic reconfiguration (including PCI | |
3 | * Hotplug and Dynamic Logical Partitioning on RPA platforms). | |
4 | * | |
5 | * Copyright (C) 2005 Nathan Lynch | |
6 | * Copyright (C) 2005 IBM Corporation | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version | |
11 | * 2 as published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/kref.h> | |
16 | #include <linux/notifier.h> | |
17 | #include <linux/proc_fs.h> | |
18 | ||
19 | #include <asm/prom.h> | |
e8222502 | 20 | #include <asm/machdep.h> |
1da177e4 | 21 | #include <asm/uaccess.h> |
e8222502 | 22 | #include <asm/pSeries_reconfig.h> |
46db2f86 | 23 | #include <asm/mmu.h> |
1da177e4 LT |
24 | |
25 | ||
26 | ||
27 | /* | |
28 | * Routines for "runtime" addition and removal of device tree nodes. | |
29 | */ | |
30 | #ifdef CONFIG_PROC_DEVICETREE | |
31 | /* | |
32 | * Add a node to /proc/device-tree. | |
33 | */ | |
34 | static void add_node_proc_entries(struct device_node *np) | |
35 | { | |
36 | struct proc_dir_entry *ent; | |
37 | ||
38 | ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde); | |
39 | if (ent) | |
40 | proc_device_tree_add_node(np, ent); | |
41 | } | |
42 | ||
43 | static void remove_node_proc_entries(struct device_node *np) | |
44 | { | |
45 | struct property *pp = np->properties; | |
46 | struct device_node *parent = np->parent; | |
47 | ||
48 | while (pp) { | |
49 | remove_proc_entry(pp->name, np->pde); | |
50 | pp = pp->next; | |
51 | } | |
1da177e4 LT |
52 | if (np->pde) |
53 | remove_proc_entry(np->pde->name, parent->pde); | |
54 | } | |
55 | #else /* !CONFIG_PROC_DEVICETREE */ | |
56 | static void add_node_proc_entries(struct device_node *np) | |
57 | { | |
58 | return; | |
59 | } | |
60 | ||
61 | static void remove_node_proc_entries(struct device_node *np) | |
62 | { | |
63 | return; | |
64 | } | |
65 | #endif /* CONFIG_PROC_DEVICETREE */ | |
66 | ||
67 | /** | |
68 | * derive_parent - basically like dirname(1) | |
69 | * @path: the full_name of a node to be added to the tree | |
70 | * | |
71 | * Returns the node which should be the parent of the node | |
72 | * described by path. E.g., for path = "/foo/bar", returns | |
73 | * the node with full_name = "/foo". | |
74 | */ | |
75 | static struct device_node *derive_parent(const char *path) | |
76 | { | |
77 | struct device_node *parent = NULL; | |
78 | char *parent_path = "/"; | |
79 | size_t parent_path_len = strrchr(path, '/') - path + 1; | |
80 | ||
81 | /* reject if path is "/" */ | |
82 | if (!strcmp(path, "/")) | |
83 | return ERR_PTR(-EINVAL); | |
84 | ||
85 | if (strrchr(path, '/') != path) { | |
86 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | |
87 | if (!parent_path) | |
88 | return ERR_PTR(-ENOMEM); | |
89 | strlcpy(parent_path, path, parent_path_len); | |
90 | } | |
91 | parent = of_find_node_by_path(parent_path); | |
92 | if (!parent) | |
93 | return ERR_PTR(-EINVAL); | |
94 | if (strcmp(parent_path, "/")) | |
95 | kfree(parent_path); | |
96 | return parent; | |
97 | } | |
98 | ||
ab519a01 | 99 | BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain); |
1da177e4 LT |
100 | |
101 | int pSeries_reconfig_notifier_register(struct notifier_block *nb) | |
102 | { | |
e041c683 | 103 | return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb); |
1da177e4 LT |
104 | } |
105 | ||
106 | void pSeries_reconfig_notifier_unregister(struct notifier_block *nb) | |
107 | { | |
e041c683 | 108 | blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb); |
1da177e4 LT |
109 | } |
110 | ||
111 | static int pSeries_reconfig_add_node(const char *path, struct property *proplist) | |
112 | { | |
113 | struct device_node *np; | |
114 | int err = -ENOMEM; | |
115 | ||
874ca6cd | 116 | np = kzalloc(sizeof(*np), GFP_KERNEL); |
1da177e4 LT |
117 | if (!np) |
118 | goto out_err; | |
119 | ||
120 | np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL); | |
121 | if (!np->full_name) | |
122 | goto out_err; | |
123 | ||
124 | strcpy(np->full_name, path); | |
125 | ||
126 | np->properties = proplist; | |
d3b814bb | 127 | of_node_set_flag(np, OF_DYNAMIC); |
1da177e4 LT |
128 | kref_init(&np->kref); |
129 | ||
130 | np->parent = derive_parent(path); | |
131 | if (IS_ERR(np->parent)) { | |
132 | err = PTR_ERR(np->parent); | |
133 | goto out_err; | |
134 | } | |
135 | ||
e041c683 | 136 | err = blocking_notifier_call_chain(&pSeries_reconfig_chain, |
1da177e4 LT |
137 | PSERIES_RECONFIG_ADD, np); |
138 | if (err == NOTIFY_BAD) { | |
139 | printk(KERN_ERR "Failed to add device node %s\n", path); | |
140 | err = -ENOMEM; /* For now, safe to assume kmalloc failure */ | |
141 | goto out_err; | |
142 | } | |
143 | ||
144 | of_attach_node(np); | |
145 | ||
146 | add_node_proc_entries(np); | |
147 | ||
148 | of_node_put(np->parent); | |
149 | ||
150 | return 0; | |
151 | ||
152 | out_err: | |
153 | if (np) { | |
154 | of_node_put(np->parent); | |
155 | kfree(np->full_name); | |
156 | kfree(np); | |
157 | } | |
158 | return err; | |
159 | } | |
160 | ||
161 | static int pSeries_reconfig_remove_node(struct device_node *np) | |
162 | { | |
163 | struct device_node *parent, *child; | |
164 | ||
165 | parent = of_get_parent(np); | |
166 | if (!parent) | |
167 | return -EINVAL; | |
168 | ||
169 | if ((child = of_get_next_child(np, NULL))) { | |
170 | of_node_put(child); | |
842decbd | 171 | of_node_put(parent); |
1da177e4 LT |
172 | return -EBUSY; |
173 | } | |
174 | ||
175 | remove_node_proc_entries(np); | |
176 | ||
e041c683 | 177 | blocking_notifier_call_chain(&pSeries_reconfig_chain, |
1da177e4 LT |
178 | PSERIES_RECONFIG_REMOVE, np); |
179 | of_detach_node(np); | |
180 | ||
181 | of_node_put(parent); | |
182 | of_node_put(np); /* Must decrement the refcount */ | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
188917e1 | 187 | * /proc/powerpc/ofdt - yucky binary interface for adding and removing |
1da177e4 LT |
188 | * OF device nodes. Should be deprecated as soon as we get an |
189 | * in-kernel wrapper for the RTAS ibm,configure-connector call. | |
190 | */ | |
191 | ||
192 | static void release_prop_list(const struct property *prop) | |
193 | { | |
194 | struct property *next; | |
195 | for (; prop; prop = next) { | |
196 | next = prop->next; | |
197 | kfree(prop->name); | |
198 | kfree(prop->value); | |
199 | kfree(prop); | |
200 | } | |
201 | ||
202 | } | |
203 | ||
204 | /** | |
205 | * parse_next_property - process the next property from raw input buffer | |
206 | * @buf: input buffer, must be nul-terminated | |
207 | * @end: end of the input buffer + 1, for validation | |
208 | * @name: return value; set to property name in buf | |
209 | * @length: return value; set to length of value | |
210 | * @value: return value; set to the property value in buf | |
211 | * | |
212 | * Note that the caller must make copies of the name and value returned, | |
213 | * this function does no allocation or copying of the data. Return value | |
214 | * is set to the next name in buf, or NULL on error. | |
215 | */ | |
216 | static char * parse_next_property(char *buf, char *end, char **name, int *length, | |
217 | unsigned char **value) | |
218 | { | |
219 | char *tmp; | |
220 | ||
221 | *name = buf; | |
222 | ||
223 | tmp = strchr(buf, ' '); | |
224 | if (!tmp) { | |
225 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 226 | __func__, __LINE__); |
1da177e4 LT |
227 | return NULL; |
228 | } | |
229 | *tmp = '\0'; | |
230 | ||
231 | if (++tmp >= end) { | |
232 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 233 | __func__, __LINE__); |
1da177e4 LT |
234 | return NULL; |
235 | } | |
236 | ||
237 | /* now we're on the length */ | |
238 | *length = -1; | |
239 | *length = simple_strtoul(tmp, &tmp, 10); | |
240 | if (*length == -1) { | |
241 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 242 | __func__, __LINE__); |
1da177e4 LT |
243 | return NULL; |
244 | } | |
245 | if (*tmp != ' ' || ++tmp >= end) { | |
246 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 247 | __func__, __LINE__); |
1da177e4 LT |
248 | return NULL; |
249 | } | |
250 | ||
251 | /* now we're on the value */ | |
252 | *value = tmp; | |
253 | tmp += *length; | |
254 | if (tmp > end) { | |
255 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 256 | __func__, __LINE__); |
1da177e4 LT |
257 | return NULL; |
258 | } | |
259 | else if (tmp < end && *tmp != ' ' && *tmp != '\0') { | |
260 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 261 | __func__, __LINE__); |
1da177e4 LT |
262 | return NULL; |
263 | } | |
264 | tmp++; | |
265 | ||
266 | /* and now we should be on the next name, or the end */ | |
267 | return tmp; | |
268 | } | |
269 | ||
270 | static struct property *new_property(const char *name, const int length, | |
271 | const unsigned char *value, struct property *last) | |
272 | { | |
f8485350 | 273 | struct property *new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
274 | |
275 | if (!new) | |
276 | return NULL; | |
1da177e4 LT |
277 | |
278 | if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL))) | |
279 | goto cleanup; | |
280 | if (!(new->value = kmalloc(length + 1, GFP_KERNEL))) | |
281 | goto cleanup; | |
282 | ||
283 | strcpy(new->name, name); | |
284 | memcpy(new->value, value, length); | |
285 | *(((char *)new->value) + length) = 0; | |
286 | new->length = length; | |
287 | new->next = last; | |
288 | return new; | |
289 | ||
290 | cleanup: | |
b2325fe1 JJ |
291 | kfree(new->name); |
292 | kfree(new->value); | |
1da177e4 LT |
293 | kfree(new); |
294 | return NULL; | |
295 | } | |
296 | ||
297 | static int do_add_node(char *buf, size_t bufsize) | |
298 | { | |
299 | char *path, *end, *name; | |
300 | struct device_node *np; | |
301 | struct property *prop = NULL; | |
302 | unsigned char* value; | |
303 | int length, rv = 0; | |
304 | ||
305 | end = buf + bufsize; | |
306 | path = buf; | |
307 | buf = strchr(buf, ' '); | |
308 | if (!buf) | |
309 | return -EINVAL; | |
310 | *buf = '\0'; | |
311 | buf++; | |
312 | ||
313 | if ((np = of_find_node_by_path(path))) { | |
314 | of_node_put(np); | |
315 | return -EINVAL; | |
316 | } | |
317 | ||
318 | /* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */ | |
319 | while (buf < end && | |
320 | (buf = parse_next_property(buf, end, &name, &length, &value))) { | |
321 | struct property *last = prop; | |
322 | ||
323 | prop = new_property(name, length, value, last); | |
324 | if (!prop) { | |
325 | rv = -ENOMEM; | |
326 | prop = last; | |
327 | goto out; | |
328 | } | |
329 | } | |
330 | if (!buf) { | |
331 | rv = -EINVAL; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | rv = pSeries_reconfig_add_node(path, prop); | |
336 | ||
337 | out: | |
338 | if (rv) | |
339 | release_prop_list(prop); | |
340 | return rv; | |
341 | } | |
342 | ||
343 | static int do_remove_node(char *buf) | |
344 | { | |
345 | struct device_node *node; | |
346 | int rv = -ENODEV; | |
347 | ||
348 | if ((node = of_find_node_by_path(buf))) | |
349 | rv = pSeries_reconfig_remove_node(node); | |
350 | ||
351 | of_node_put(node); | |
352 | return rv; | |
353 | } | |
354 | ||
610d9151 DB |
355 | static char *parse_node(char *buf, size_t bufsize, struct device_node **npp) |
356 | { | |
357 | char *handle_str; | |
358 | phandle handle; | |
359 | *npp = NULL; | |
360 | ||
361 | handle_str = buf; | |
362 | ||
363 | buf = strchr(buf, ' '); | |
364 | if (!buf) | |
365 | return NULL; | |
366 | *buf = '\0'; | |
367 | buf++; | |
368 | ||
4b6e805e | 369 | handle = simple_strtoul(handle_str, NULL, 0); |
610d9151 DB |
370 | |
371 | *npp = of_find_node_by_phandle(handle); | |
372 | return buf; | |
373 | } | |
374 | ||
375 | static int do_add_property(char *buf, size_t bufsize) | |
376 | { | |
377 | struct property *prop = NULL; | |
378 | struct device_node *np; | |
379 | unsigned char *value; | |
380 | char *name, *end; | |
381 | int length; | |
382 | end = buf + bufsize; | |
383 | buf = parse_node(buf, bufsize, &np); | |
384 | ||
385 | if (!np) | |
386 | return -ENODEV; | |
387 | ||
388 | if (parse_next_property(buf, end, &name, &length, &value) == NULL) | |
389 | return -EINVAL; | |
390 | ||
391 | prop = new_property(name, length, value, NULL); | |
392 | if (!prop) | |
393 | return -ENOMEM; | |
394 | ||
395 | prom_add_property(np, prop); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static int do_remove_property(char *buf, size_t bufsize) | |
401 | { | |
402 | struct device_node *np; | |
403 | char *tmp; | |
404 | struct property *prop; | |
405 | buf = parse_node(buf, bufsize, &np); | |
406 | ||
407 | if (!np) | |
408 | return -ENODEV; | |
409 | ||
410 | tmp = strchr(buf,' '); | |
411 | if (tmp) | |
412 | *tmp = '\0'; | |
413 | ||
414 | if (strlen(buf) == 0) | |
415 | return -EINVAL; | |
416 | ||
417 | prop = of_find_property(np, buf, NULL); | |
418 | ||
419 | return prom_remove_property(np, prop); | |
420 | } | |
421 | ||
422 | static int do_update_property(char *buf, size_t bufsize) | |
423 | { | |
424 | struct device_node *np; | |
425 | unsigned char *value; | |
3c3f67ea NF |
426 | char *name, *end, *next_prop; |
427 | int rc, length; | |
610d9151 DB |
428 | struct property *newprop, *oldprop; |
429 | buf = parse_node(buf, bufsize, &np); | |
430 | end = buf + bufsize; | |
431 | ||
432 | if (!np) | |
433 | return -ENODEV; | |
434 | ||
3c3f67ea NF |
435 | next_prop = parse_next_property(buf, end, &name, &length, &value); |
436 | if (!next_prop) | |
610d9151 DB |
437 | return -EINVAL; |
438 | ||
439 | newprop = new_property(name, length, value, NULL); | |
440 | if (!newprop) | |
441 | return -ENOMEM; | |
442 | ||
46db2f86 BK |
443 | if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size")) |
444 | slb_set_size(*(int *)value); | |
445 | ||
610d9151 | 446 | oldprop = of_find_property(np, name,NULL); |
46db2f86 BK |
447 | if (!oldprop) { |
448 | if (strlen(name)) | |
449 | return prom_add_property(np, newprop); | |
610d9151 | 450 | return -ENODEV; |
46db2f86 | 451 | } |
610d9151 | 452 | |
3c3f67ea NF |
453 | rc = prom_update_property(np, newprop, oldprop); |
454 | if (rc) | |
455 | return rc; | |
456 | ||
457 | /* For memory under the ibm,dynamic-reconfiguration-memory node | |
458 | * of the device tree, adding and removing memory is just an update | |
459 | * to the ibm,dynamic-memory property instead of adding/removing a | |
460 | * memory node in the device tree. For these cases we still need to | |
461 | * involve the notifier chain. | |
462 | */ | |
463 | if (!strcmp(name, "ibm,dynamic-memory")) { | |
464 | int action; | |
465 | ||
466 | next_prop = parse_next_property(next_prop, end, &name, | |
467 | &length, &value); | |
468 | if (!next_prop) | |
469 | return -EINVAL; | |
470 | ||
471 | if (!strcmp(name, "add")) | |
472 | action = PSERIES_DRCONF_MEM_ADD; | |
473 | else | |
474 | action = PSERIES_DRCONF_MEM_REMOVE; | |
475 | ||
525c411d NF |
476 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, |
477 | action, value); | |
c5785f9e NF |
478 | if (rc == NOTIFY_BAD) { |
479 | rc = prom_update_property(np, oldprop, newprop); | |
480 | return -ENOMEM; | |
481 | } | |
3c3f67ea NF |
482 | } |
483 | ||
c5785f9e | 484 | return 0; |
610d9151 DB |
485 | } |
486 | ||
1da177e4 LT |
487 | /** |
488 | * ofdt_write - perform operations on the Open Firmware device tree | |
489 | * | |
490 | * @file: not used | |
491 | * @buf: command and arguments | |
492 | * @count: size of the command buffer | |
493 | * @off: not used | |
494 | * | |
495 | * Operations supported at this time are addition and removal of | |
496 | * whole nodes along with their properties. Operations on individual | |
497 | * properties are not implemented (yet). | |
498 | */ | |
499 | static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count, | |
500 | loff_t *off) | |
501 | { | |
502 | int rv = 0; | |
503 | char *kbuf; | |
504 | char *tmp; | |
505 | ||
506 | if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) { | |
507 | rv = -ENOMEM; | |
508 | goto out; | |
509 | } | |
510 | if (copy_from_user(kbuf, buf, count)) { | |
511 | rv = -EFAULT; | |
512 | goto out; | |
513 | } | |
514 | ||
515 | kbuf[count] = '\0'; | |
516 | ||
517 | tmp = strchr(kbuf, ' '); | |
518 | if (!tmp) { | |
519 | rv = -EINVAL; | |
520 | goto out; | |
521 | } | |
522 | *tmp = '\0'; | |
523 | tmp++; | |
524 | ||
525 | if (!strcmp(kbuf, "add_node")) | |
526 | rv = do_add_node(tmp, count - (tmp - kbuf)); | |
527 | else if (!strcmp(kbuf, "remove_node")) | |
528 | rv = do_remove_node(tmp); | |
610d9151 DB |
529 | else if (!strcmp(kbuf, "add_property")) |
530 | rv = do_add_property(tmp, count - (tmp - kbuf)); | |
531 | else if (!strcmp(kbuf, "remove_property")) | |
532 | rv = do_remove_property(tmp, count - (tmp - kbuf)); | |
533 | else if (!strcmp(kbuf, "update_property")) | |
534 | rv = do_update_property(tmp, count - (tmp - kbuf)); | |
1da177e4 LT |
535 | else |
536 | rv = -EINVAL; | |
537 | out: | |
538 | kfree(kbuf); | |
539 | return rv ? rv : count; | |
540 | } | |
541 | ||
5dfe4c96 | 542 | static const struct file_operations ofdt_fops = { |
1da177e4 LT |
543 | .write = ofdt_write |
544 | }; | |
545 | ||
188917e1 | 546 | /* create /proc/powerpc/ofdt write-only by root */ |
1da177e4 LT |
547 | static int proc_ppc64_create_ofdt(void) |
548 | { | |
549 | struct proc_dir_entry *ent; | |
550 | ||
e8222502 | 551 | if (!machine_is(pseries)) |
1da177e4 LT |
552 | return 0; |
553 | ||
188917e1 | 554 | ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops); |
66747138 | 555 | if (ent) |
1da177e4 | 556 | ent->size = 0; |
1da177e4 LT |
557 | |
558 | return 0; | |
559 | } | |
560 | __initcall(proc_ppc64_create_ofdt); |