Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | |
20 | #include <asm/prom.h> | |
e8222502 | 21 | #include <asm/machdep.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
e8222502 | 23 | #include <asm/pSeries_reconfig.h> |
46db2f86 | 24 | #include <asm/mmu.h> |
1da177e4 LT |
25 | |
26 | ||
27 | ||
28 | /* | |
29 | * Routines for "runtime" addition and removal of device tree nodes. | |
30 | */ | |
31 | #ifdef CONFIG_PROC_DEVICETREE | |
32 | /* | |
33 | * Add a node to /proc/device-tree. | |
34 | */ | |
35 | static void add_node_proc_entries(struct device_node *np) | |
36 | { | |
37 | struct proc_dir_entry *ent; | |
38 | ||
39 | ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde); | |
40 | if (ent) | |
41 | proc_device_tree_add_node(np, ent); | |
42 | } | |
43 | ||
44 | static void remove_node_proc_entries(struct device_node *np) | |
45 | { | |
46 | struct property *pp = np->properties; | |
47 | struct device_node *parent = np->parent; | |
48 | ||
49 | while (pp) { | |
50 | remove_proc_entry(pp->name, np->pde); | |
51 | pp = pp->next; | |
52 | } | |
1da177e4 LT |
53 | if (np->pde) |
54 | remove_proc_entry(np->pde->name, parent->pde); | |
55 | } | |
56 | #else /* !CONFIG_PROC_DEVICETREE */ | |
57 | static void add_node_proc_entries(struct device_node *np) | |
58 | { | |
59 | return; | |
60 | } | |
61 | ||
62 | static void remove_node_proc_entries(struct device_node *np) | |
63 | { | |
64 | return; | |
65 | } | |
66 | #endif /* CONFIG_PROC_DEVICETREE */ | |
67 | ||
68 | /** | |
69 | * derive_parent - basically like dirname(1) | |
70 | * @path: the full_name of a node to be added to the tree | |
71 | * | |
72 | * Returns the node which should be the parent of the node | |
73 | * described by path. E.g., for path = "/foo/bar", returns | |
74 | * the node with full_name = "/foo". | |
75 | */ | |
76 | static struct device_node *derive_parent(const char *path) | |
77 | { | |
78 | struct device_node *parent = NULL; | |
79 | char *parent_path = "/"; | |
80 | size_t parent_path_len = strrchr(path, '/') - path + 1; | |
81 | ||
82 | /* reject if path is "/" */ | |
83 | if (!strcmp(path, "/")) | |
84 | return ERR_PTR(-EINVAL); | |
85 | ||
86 | if (strrchr(path, '/') != path) { | |
87 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | |
88 | if (!parent_path) | |
89 | return ERR_PTR(-ENOMEM); | |
90 | strlcpy(parent_path, path, parent_path_len); | |
91 | } | |
92 | parent = of_find_node_by_path(parent_path); | |
93 | if (!parent) | |
94 | return ERR_PTR(-EINVAL); | |
95 | if (strcmp(parent_path, "/")) | |
96 | kfree(parent_path); | |
97 | return parent; | |
98 | } | |
99 | ||
ab519a01 | 100 | BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain); |
1da177e4 LT |
101 | |
102 | int pSeries_reconfig_notifier_register(struct notifier_block *nb) | |
103 | { | |
e041c683 | 104 | return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb); |
1da177e4 LT |
105 | } |
106 | ||
107 | void pSeries_reconfig_notifier_unregister(struct notifier_block *nb) | |
108 | { | |
e041c683 | 109 | blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb); |
1da177e4 LT |
110 | } |
111 | ||
112 | static int pSeries_reconfig_add_node(const char *path, struct property *proplist) | |
113 | { | |
114 | struct device_node *np; | |
115 | int err = -ENOMEM; | |
116 | ||
874ca6cd | 117 | np = kzalloc(sizeof(*np), GFP_KERNEL); |
1da177e4 LT |
118 | if (!np) |
119 | goto out_err; | |
120 | ||
121 | np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL); | |
122 | if (!np->full_name) | |
123 | goto out_err; | |
124 | ||
125 | strcpy(np->full_name, path); | |
126 | ||
127 | np->properties = proplist; | |
d3b814bb | 128 | of_node_set_flag(np, OF_DYNAMIC); |
1da177e4 LT |
129 | kref_init(&np->kref); |
130 | ||
131 | np->parent = derive_parent(path); | |
132 | if (IS_ERR(np->parent)) { | |
133 | err = PTR_ERR(np->parent); | |
134 | goto out_err; | |
135 | } | |
136 | ||
e041c683 | 137 | err = blocking_notifier_call_chain(&pSeries_reconfig_chain, |
1da177e4 LT |
138 | PSERIES_RECONFIG_ADD, np); |
139 | if (err == NOTIFY_BAD) { | |
140 | printk(KERN_ERR "Failed to add device node %s\n", path); | |
141 | err = -ENOMEM; /* For now, safe to assume kmalloc failure */ | |
142 | goto out_err; | |
143 | } | |
144 | ||
145 | of_attach_node(np); | |
146 | ||
147 | add_node_proc_entries(np); | |
148 | ||
149 | of_node_put(np->parent); | |
150 | ||
151 | return 0; | |
152 | ||
153 | out_err: | |
154 | if (np) { | |
155 | of_node_put(np->parent); | |
156 | kfree(np->full_name); | |
157 | kfree(np); | |
158 | } | |
159 | return err; | |
160 | } | |
161 | ||
162 | static int pSeries_reconfig_remove_node(struct device_node *np) | |
163 | { | |
164 | struct device_node *parent, *child; | |
165 | ||
166 | parent = of_get_parent(np); | |
167 | if (!parent) | |
168 | return -EINVAL; | |
169 | ||
170 | if ((child = of_get_next_child(np, NULL))) { | |
171 | of_node_put(child); | |
842decbd | 172 | of_node_put(parent); |
1da177e4 LT |
173 | return -EBUSY; |
174 | } | |
175 | ||
176 | remove_node_proc_entries(np); | |
177 | ||
e041c683 | 178 | blocking_notifier_call_chain(&pSeries_reconfig_chain, |
1da177e4 LT |
179 | PSERIES_RECONFIG_REMOVE, np); |
180 | of_detach_node(np); | |
181 | ||
182 | of_node_put(parent); | |
183 | of_node_put(np); /* Must decrement the refcount */ | |
184 | return 0; | |
185 | } | |
186 | ||
187 | /* | |
188917e1 | 188 | * /proc/powerpc/ofdt - yucky binary interface for adding and removing |
1da177e4 LT |
189 | * OF device nodes. Should be deprecated as soon as we get an |
190 | * in-kernel wrapper for the RTAS ibm,configure-connector call. | |
191 | */ | |
192 | ||
193 | static void release_prop_list(const struct property *prop) | |
194 | { | |
195 | struct property *next; | |
196 | for (; prop; prop = next) { | |
197 | next = prop->next; | |
198 | kfree(prop->name); | |
199 | kfree(prop->value); | |
200 | kfree(prop); | |
201 | } | |
202 | ||
203 | } | |
204 | ||
205 | /** | |
206 | * parse_next_property - process the next property from raw input buffer | |
207 | * @buf: input buffer, must be nul-terminated | |
208 | * @end: end of the input buffer + 1, for validation | |
209 | * @name: return value; set to property name in buf | |
210 | * @length: return value; set to length of value | |
211 | * @value: return value; set to the property value in buf | |
212 | * | |
213 | * Note that the caller must make copies of the name and value returned, | |
214 | * this function does no allocation or copying of the data. Return value | |
215 | * is set to the next name in buf, or NULL on error. | |
216 | */ | |
217 | static char * parse_next_property(char *buf, char *end, char **name, int *length, | |
218 | unsigned char **value) | |
219 | { | |
220 | char *tmp; | |
221 | ||
222 | *name = buf; | |
223 | ||
224 | tmp = strchr(buf, ' '); | |
225 | if (!tmp) { | |
226 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 227 | __func__, __LINE__); |
1da177e4 LT |
228 | return NULL; |
229 | } | |
230 | *tmp = '\0'; | |
231 | ||
232 | if (++tmp >= end) { | |
233 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 234 | __func__, __LINE__); |
1da177e4 LT |
235 | return NULL; |
236 | } | |
237 | ||
238 | /* now we're on the length */ | |
239 | *length = -1; | |
240 | *length = simple_strtoul(tmp, &tmp, 10); | |
241 | if (*length == -1) { | |
242 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 243 | __func__, __LINE__); |
1da177e4 LT |
244 | return NULL; |
245 | } | |
246 | if (*tmp != ' ' || ++tmp >= end) { | |
247 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 248 | __func__, __LINE__); |
1da177e4 LT |
249 | return NULL; |
250 | } | |
251 | ||
252 | /* now we're on the value */ | |
253 | *value = tmp; | |
254 | tmp += *length; | |
255 | if (tmp > end) { | |
256 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 257 | __func__, __LINE__); |
1da177e4 LT |
258 | return NULL; |
259 | } | |
260 | else if (tmp < end && *tmp != ' ' && *tmp != '\0') { | |
261 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 262 | __func__, __LINE__); |
1da177e4 LT |
263 | return NULL; |
264 | } | |
265 | tmp++; | |
266 | ||
267 | /* and now we should be on the next name, or the end */ | |
268 | return tmp; | |
269 | } | |
270 | ||
271 | static struct property *new_property(const char *name, const int length, | |
272 | const unsigned char *value, struct property *last) | |
273 | { | |
f8485350 | 274 | struct property *new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
275 | |
276 | if (!new) | |
277 | return NULL; | |
1da177e4 LT |
278 | |
279 | if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL))) | |
280 | goto cleanup; | |
281 | if (!(new->value = kmalloc(length + 1, GFP_KERNEL))) | |
282 | goto cleanup; | |
283 | ||
284 | strcpy(new->name, name); | |
285 | memcpy(new->value, value, length); | |
286 | *(((char *)new->value) + length) = 0; | |
287 | new->length = length; | |
288 | new->next = last; | |
289 | return new; | |
290 | ||
291 | cleanup: | |
b2325fe1 JJ |
292 | kfree(new->name); |
293 | kfree(new->value); | |
1da177e4 LT |
294 | kfree(new); |
295 | return NULL; | |
296 | } | |
297 | ||
298 | static int do_add_node(char *buf, size_t bufsize) | |
299 | { | |
300 | char *path, *end, *name; | |
301 | struct device_node *np; | |
302 | struct property *prop = NULL; | |
303 | unsigned char* value; | |
304 | int length, rv = 0; | |
305 | ||
306 | end = buf + bufsize; | |
307 | path = buf; | |
308 | buf = strchr(buf, ' '); | |
309 | if (!buf) | |
310 | return -EINVAL; | |
311 | *buf = '\0'; | |
312 | buf++; | |
313 | ||
314 | if ((np = of_find_node_by_path(path))) { | |
315 | of_node_put(np); | |
316 | return -EINVAL; | |
317 | } | |
318 | ||
319 | /* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */ | |
320 | while (buf < end && | |
321 | (buf = parse_next_property(buf, end, &name, &length, &value))) { | |
322 | struct property *last = prop; | |
323 | ||
324 | prop = new_property(name, length, value, last); | |
325 | if (!prop) { | |
326 | rv = -ENOMEM; | |
327 | prop = last; | |
328 | goto out; | |
329 | } | |
330 | } | |
331 | if (!buf) { | |
332 | rv = -EINVAL; | |
333 | goto out; | |
334 | } | |
335 | ||
336 | rv = pSeries_reconfig_add_node(path, prop); | |
337 | ||
338 | out: | |
339 | if (rv) | |
340 | release_prop_list(prop); | |
341 | return rv; | |
342 | } | |
343 | ||
344 | static int do_remove_node(char *buf) | |
345 | { | |
346 | struct device_node *node; | |
347 | int rv = -ENODEV; | |
348 | ||
349 | if ((node = of_find_node_by_path(buf))) | |
350 | rv = pSeries_reconfig_remove_node(node); | |
351 | ||
352 | of_node_put(node); | |
353 | return rv; | |
354 | } | |
355 | ||
610d9151 DB |
356 | static char *parse_node(char *buf, size_t bufsize, struct device_node **npp) |
357 | { | |
358 | char *handle_str; | |
359 | phandle handle; | |
360 | *npp = NULL; | |
361 | ||
362 | handle_str = buf; | |
363 | ||
364 | buf = strchr(buf, ' '); | |
365 | if (!buf) | |
366 | return NULL; | |
367 | *buf = '\0'; | |
368 | buf++; | |
369 | ||
4b6e805e | 370 | handle = simple_strtoul(handle_str, NULL, 0); |
610d9151 DB |
371 | |
372 | *npp = of_find_node_by_phandle(handle); | |
373 | return buf; | |
374 | } | |
375 | ||
376 | static int do_add_property(char *buf, size_t bufsize) | |
377 | { | |
378 | struct property *prop = NULL; | |
379 | struct device_node *np; | |
380 | unsigned char *value; | |
381 | char *name, *end; | |
382 | int length; | |
383 | end = buf + bufsize; | |
384 | buf = parse_node(buf, bufsize, &np); | |
385 | ||
386 | if (!np) | |
387 | return -ENODEV; | |
388 | ||
389 | if (parse_next_property(buf, end, &name, &length, &value) == NULL) | |
390 | return -EINVAL; | |
391 | ||
392 | prop = new_property(name, length, value, NULL); | |
393 | if (!prop) | |
394 | return -ENOMEM; | |
395 | ||
396 | prom_add_property(np, prop); | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | static int do_remove_property(char *buf, size_t bufsize) | |
402 | { | |
403 | struct device_node *np; | |
404 | char *tmp; | |
405 | struct property *prop; | |
406 | buf = parse_node(buf, bufsize, &np); | |
407 | ||
408 | if (!np) | |
409 | return -ENODEV; | |
410 | ||
411 | tmp = strchr(buf,' '); | |
412 | if (tmp) | |
413 | *tmp = '\0'; | |
414 | ||
415 | if (strlen(buf) == 0) | |
416 | return -EINVAL; | |
417 | ||
418 | prop = of_find_property(np, buf, NULL); | |
419 | ||
420 | return prom_remove_property(np, prop); | |
421 | } | |
422 | ||
423 | static int do_update_property(char *buf, size_t bufsize) | |
424 | { | |
425 | struct device_node *np; | |
426 | unsigned char *value; | |
3c3f67ea NF |
427 | char *name, *end, *next_prop; |
428 | int rc, length; | |
610d9151 DB |
429 | struct property *newprop, *oldprop; |
430 | buf = parse_node(buf, bufsize, &np); | |
431 | end = buf + bufsize; | |
432 | ||
433 | if (!np) | |
434 | return -ENODEV; | |
435 | ||
3c3f67ea NF |
436 | next_prop = parse_next_property(buf, end, &name, &length, &value); |
437 | if (!next_prop) | |
610d9151 DB |
438 | return -EINVAL; |
439 | ||
440 | newprop = new_property(name, length, value, NULL); | |
441 | if (!newprop) | |
442 | return -ENOMEM; | |
443 | ||
46db2f86 BK |
444 | if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size")) |
445 | slb_set_size(*(int *)value); | |
446 | ||
610d9151 | 447 | oldprop = of_find_property(np, name,NULL); |
46db2f86 BK |
448 | if (!oldprop) { |
449 | if (strlen(name)) | |
450 | return prom_add_property(np, newprop); | |
610d9151 | 451 | return -ENODEV; |
46db2f86 | 452 | } |
610d9151 | 453 | |
3c3f67ea NF |
454 | rc = prom_update_property(np, newprop, oldprop); |
455 | if (rc) | |
456 | return rc; | |
457 | ||
458 | /* For memory under the ibm,dynamic-reconfiguration-memory node | |
459 | * of the device tree, adding and removing memory is just an update | |
460 | * to the ibm,dynamic-memory property instead of adding/removing a | |
461 | * memory node in the device tree. For these cases we still need to | |
462 | * involve the notifier chain. | |
463 | */ | |
464 | if (!strcmp(name, "ibm,dynamic-memory")) { | |
465 | int action; | |
466 | ||
467 | next_prop = parse_next_property(next_prop, end, &name, | |
468 | &length, &value); | |
469 | if (!next_prop) | |
470 | return -EINVAL; | |
471 | ||
472 | if (!strcmp(name, "add")) | |
473 | action = PSERIES_DRCONF_MEM_ADD; | |
474 | else | |
475 | action = PSERIES_DRCONF_MEM_REMOVE; | |
476 | ||
525c411d NF |
477 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, |
478 | action, value); | |
c5785f9e NF |
479 | if (rc == NOTIFY_BAD) { |
480 | rc = prom_update_property(np, oldprop, newprop); | |
481 | return -ENOMEM; | |
482 | } | |
3c3f67ea NF |
483 | } |
484 | ||
c5785f9e | 485 | return 0; |
610d9151 DB |
486 | } |
487 | ||
1da177e4 LT |
488 | /** |
489 | * ofdt_write - perform operations on the Open Firmware device tree | |
490 | * | |
491 | * @file: not used | |
492 | * @buf: command and arguments | |
493 | * @count: size of the command buffer | |
494 | * @off: not used | |
495 | * | |
496 | * Operations supported at this time are addition and removal of | |
497 | * whole nodes along with their properties. Operations on individual | |
498 | * properties are not implemented (yet). | |
499 | */ | |
500 | static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count, | |
501 | loff_t *off) | |
502 | { | |
503 | int rv = 0; | |
504 | char *kbuf; | |
505 | char *tmp; | |
506 | ||
507 | if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) { | |
508 | rv = -ENOMEM; | |
509 | goto out; | |
510 | } | |
511 | if (copy_from_user(kbuf, buf, count)) { | |
512 | rv = -EFAULT; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | kbuf[count] = '\0'; | |
517 | ||
518 | tmp = strchr(kbuf, ' '); | |
519 | if (!tmp) { | |
520 | rv = -EINVAL; | |
521 | goto out; | |
522 | } | |
523 | *tmp = '\0'; | |
524 | tmp++; | |
525 | ||
526 | if (!strcmp(kbuf, "add_node")) | |
527 | rv = do_add_node(tmp, count - (tmp - kbuf)); | |
528 | else if (!strcmp(kbuf, "remove_node")) | |
529 | rv = do_remove_node(tmp); | |
610d9151 DB |
530 | else if (!strcmp(kbuf, "add_property")) |
531 | rv = do_add_property(tmp, count - (tmp - kbuf)); | |
532 | else if (!strcmp(kbuf, "remove_property")) | |
533 | rv = do_remove_property(tmp, count - (tmp - kbuf)); | |
534 | else if (!strcmp(kbuf, "update_property")) | |
535 | rv = do_update_property(tmp, count - (tmp - kbuf)); | |
1da177e4 LT |
536 | else |
537 | rv = -EINVAL; | |
538 | out: | |
539 | kfree(kbuf); | |
540 | return rv ? rv : count; | |
541 | } | |
542 | ||
5dfe4c96 | 543 | static const struct file_operations ofdt_fops = { |
1da177e4 LT |
544 | .write = ofdt_write |
545 | }; | |
546 | ||
188917e1 | 547 | /* create /proc/powerpc/ofdt write-only by root */ |
1da177e4 LT |
548 | static int proc_ppc64_create_ofdt(void) |
549 | { | |
550 | struct proc_dir_entry *ent; | |
551 | ||
e8222502 | 552 | if (!machine_is(pseries)) |
1da177e4 LT |
553 | return 0; |
554 | ||
188917e1 | 555 | ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops); |
66747138 | 556 | if (ent) |
1da177e4 | 557 | ent->size = 0; |
1da177e4 LT |
558 | |
559 | return 0; | |
560 | } | |
561 | __initcall(proc_ppc64_create_ofdt); |