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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> | |
20 | #include <asm/pSeries_reconfig.h> | |
21 | #include <asm/uaccess.h> | |
22 | ||
23 | ||
24 | ||
25 | /* | |
26 | * Routines for "runtime" addition and removal of device tree nodes. | |
27 | */ | |
28 | #ifdef CONFIG_PROC_DEVICETREE | |
29 | /* | |
30 | * Add a node to /proc/device-tree. | |
31 | */ | |
32 | static void add_node_proc_entries(struct device_node *np) | |
33 | { | |
34 | struct proc_dir_entry *ent; | |
35 | ||
36 | ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde); | |
37 | if (ent) | |
38 | proc_device_tree_add_node(np, ent); | |
39 | } | |
40 | ||
41 | static void remove_node_proc_entries(struct device_node *np) | |
42 | { | |
43 | struct property *pp = np->properties; | |
44 | struct device_node *parent = np->parent; | |
45 | ||
46 | while (pp) { | |
47 | remove_proc_entry(pp->name, np->pde); | |
48 | pp = pp->next; | |
49 | } | |
1da177e4 LT |
50 | if (np->pde) |
51 | remove_proc_entry(np->pde->name, parent->pde); | |
52 | } | |
53 | #else /* !CONFIG_PROC_DEVICETREE */ | |
54 | static void add_node_proc_entries(struct device_node *np) | |
55 | { | |
56 | return; | |
57 | } | |
58 | ||
59 | static void remove_node_proc_entries(struct device_node *np) | |
60 | { | |
61 | return; | |
62 | } | |
63 | #endif /* CONFIG_PROC_DEVICETREE */ | |
64 | ||
65 | /** | |
66 | * derive_parent - basically like dirname(1) | |
67 | * @path: the full_name of a node to be added to the tree | |
68 | * | |
69 | * Returns the node which should be the parent of the node | |
70 | * described by path. E.g., for path = "/foo/bar", returns | |
71 | * the node with full_name = "/foo". | |
72 | */ | |
73 | static struct device_node *derive_parent(const char *path) | |
74 | { | |
75 | struct device_node *parent = NULL; | |
76 | char *parent_path = "/"; | |
77 | size_t parent_path_len = strrchr(path, '/') - path + 1; | |
78 | ||
79 | /* reject if path is "/" */ | |
80 | if (!strcmp(path, "/")) | |
81 | return ERR_PTR(-EINVAL); | |
82 | ||
83 | if (strrchr(path, '/') != path) { | |
84 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | |
85 | if (!parent_path) | |
86 | return ERR_PTR(-ENOMEM); | |
87 | strlcpy(parent_path, path, parent_path_len); | |
88 | } | |
89 | parent = of_find_node_by_path(parent_path); | |
90 | if (!parent) | |
91 | return ERR_PTR(-EINVAL); | |
92 | if (strcmp(parent_path, "/")) | |
93 | kfree(parent_path); | |
94 | return parent; | |
95 | } | |
96 | ||
97 | static struct notifier_block *pSeries_reconfig_chain; | |
98 | ||
99 | int pSeries_reconfig_notifier_register(struct notifier_block *nb) | |
100 | { | |
101 | return notifier_chain_register(&pSeries_reconfig_chain, nb); | |
102 | } | |
103 | ||
104 | void pSeries_reconfig_notifier_unregister(struct notifier_block *nb) | |
105 | { | |
106 | notifier_chain_unregister(&pSeries_reconfig_chain, nb); | |
107 | } | |
108 | ||
109 | static int pSeries_reconfig_add_node(const char *path, struct property *proplist) | |
110 | { | |
111 | struct device_node *np; | |
112 | int err = -ENOMEM; | |
113 | ||
874ca6cd | 114 | np = kzalloc(sizeof(*np), GFP_KERNEL); |
1da177e4 LT |
115 | if (!np) |
116 | goto out_err; | |
117 | ||
118 | np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL); | |
119 | if (!np->full_name) | |
120 | goto out_err; | |
121 | ||
122 | strcpy(np->full_name, path); | |
123 | ||
124 | np->properties = proplist; | |
125 | OF_MARK_DYNAMIC(np); | |
126 | kref_init(&np->kref); | |
127 | ||
128 | np->parent = derive_parent(path); | |
129 | if (IS_ERR(np->parent)) { | |
130 | err = PTR_ERR(np->parent); | |
131 | goto out_err; | |
132 | } | |
133 | ||
134 | err = notifier_call_chain(&pSeries_reconfig_chain, | |
135 | PSERIES_RECONFIG_ADD, np); | |
136 | if (err == NOTIFY_BAD) { | |
137 | printk(KERN_ERR "Failed to add device node %s\n", path); | |
138 | err = -ENOMEM; /* For now, safe to assume kmalloc failure */ | |
139 | goto out_err; | |
140 | } | |
141 | ||
142 | of_attach_node(np); | |
143 | ||
144 | add_node_proc_entries(np); | |
145 | ||
146 | of_node_put(np->parent); | |
147 | ||
148 | return 0; | |
149 | ||
150 | out_err: | |
151 | if (np) { | |
152 | of_node_put(np->parent); | |
153 | kfree(np->full_name); | |
154 | kfree(np); | |
155 | } | |
156 | return err; | |
157 | } | |
158 | ||
159 | static int pSeries_reconfig_remove_node(struct device_node *np) | |
160 | { | |
161 | struct device_node *parent, *child; | |
162 | ||
163 | parent = of_get_parent(np); | |
164 | if (!parent) | |
165 | return -EINVAL; | |
166 | ||
167 | if ((child = of_get_next_child(np, NULL))) { | |
168 | of_node_put(child); | |
169 | return -EBUSY; | |
170 | } | |
171 | ||
172 | remove_node_proc_entries(np); | |
173 | ||
174 | notifier_call_chain(&pSeries_reconfig_chain, | |
175 | PSERIES_RECONFIG_REMOVE, np); | |
176 | of_detach_node(np); | |
177 | ||
178 | of_node_put(parent); | |
179 | of_node_put(np); /* Must decrement the refcount */ | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * /proc/ppc64/ofdt - yucky binary interface for adding and removing | |
185 | * OF device nodes. Should be deprecated as soon as we get an | |
186 | * in-kernel wrapper for the RTAS ibm,configure-connector call. | |
187 | */ | |
188 | ||
189 | static void release_prop_list(const struct property *prop) | |
190 | { | |
191 | struct property *next; | |
192 | for (; prop; prop = next) { | |
193 | next = prop->next; | |
194 | kfree(prop->name); | |
195 | kfree(prop->value); | |
196 | kfree(prop); | |
197 | } | |
198 | ||
199 | } | |
200 | ||
201 | /** | |
202 | * parse_next_property - process the next property from raw input buffer | |
203 | * @buf: input buffer, must be nul-terminated | |
204 | * @end: end of the input buffer + 1, for validation | |
205 | * @name: return value; set to property name in buf | |
206 | * @length: return value; set to length of value | |
207 | * @value: return value; set to the property value in buf | |
208 | * | |
209 | * Note that the caller must make copies of the name and value returned, | |
210 | * this function does no allocation or copying of the data. Return value | |
211 | * is set to the next name in buf, or NULL on error. | |
212 | */ | |
213 | static char * parse_next_property(char *buf, char *end, char **name, int *length, | |
214 | unsigned char **value) | |
215 | { | |
216 | char *tmp; | |
217 | ||
218 | *name = buf; | |
219 | ||
220 | tmp = strchr(buf, ' '); | |
221 | if (!tmp) { | |
222 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
223 | __FUNCTION__, __LINE__); | |
224 | return NULL; | |
225 | } | |
226 | *tmp = '\0'; | |
227 | ||
228 | if (++tmp >= end) { | |
229 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
230 | __FUNCTION__, __LINE__); | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | /* now we're on the length */ | |
235 | *length = -1; | |
236 | *length = simple_strtoul(tmp, &tmp, 10); | |
237 | if (*length == -1) { | |
238 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
239 | __FUNCTION__, __LINE__); | |
240 | return NULL; | |
241 | } | |
242 | if (*tmp != ' ' || ++tmp >= end) { | |
243 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
244 | __FUNCTION__, __LINE__); | |
245 | return NULL; | |
246 | } | |
247 | ||
248 | /* now we're on the value */ | |
249 | *value = tmp; | |
250 | tmp += *length; | |
251 | if (tmp > end) { | |
252 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
253 | __FUNCTION__, __LINE__); | |
254 | return NULL; | |
255 | } | |
256 | else if (tmp < end && *tmp != ' ' && *tmp != '\0') { | |
257 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
258 | __FUNCTION__, __LINE__); | |
259 | return NULL; | |
260 | } | |
261 | tmp++; | |
262 | ||
263 | /* and now we should be on the next name, or the end */ | |
264 | return tmp; | |
265 | } | |
266 | ||
267 | static struct property *new_property(const char *name, const int length, | |
268 | const unsigned char *value, struct property *last) | |
269 | { | |
270 | struct property *new = kmalloc(sizeof(*new), GFP_KERNEL); | |
271 | ||
272 | if (!new) | |
273 | return NULL; | |
274 | memset(new, 0, sizeof(*new)); | |
275 | ||
276 | if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL))) | |
277 | goto cleanup; | |
278 | if (!(new->value = kmalloc(length + 1, GFP_KERNEL))) | |
279 | goto cleanup; | |
280 | ||
281 | strcpy(new->name, name); | |
282 | memcpy(new->value, value, length); | |
283 | *(((char *)new->value) + length) = 0; | |
284 | new->length = length; | |
285 | new->next = last; | |
286 | return new; | |
287 | ||
288 | cleanup: | |
289 | if (new->name) | |
290 | kfree(new->name); | |
291 | if (new->value) | |
292 | kfree(new->value); | |
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 | ||
355 | /** | |
356 | * ofdt_write - perform operations on the Open Firmware device tree | |
357 | * | |
358 | * @file: not used | |
359 | * @buf: command and arguments | |
360 | * @count: size of the command buffer | |
361 | * @off: not used | |
362 | * | |
363 | * Operations supported at this time are addition and removal of | |
364 | * whole nodes along with their properties. Operations on individual | |
365 | * properties are not implemented (yet). | |
366 | */ | |
367 | static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count, | |
368 | loff_t *off) | |
369 | { | |
370 | int rv = 0; | |
371 | char *kbuf; | |
372 | char *tmp; | |
373 | ||
374 | if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) { | |
375 | rv = -ENOMEM; | |
376 | goto out; | |
377 | } | |
378 | if (copy_from_user(kbuf, buf, count)) { | |
379 | rv = -EFAULT; | |
380 | goto out; | |
381 | } | |
382 | ||
383 | kbuf[count] = '\0'; | |
384 | ||
385 | tmp = strchr(kbuf, ' '); | |
386 | if (!tmp) { | |
387 | rv = -EINVAL; | |
388 | goto out; | |
389 | } | |
390 | *tmp = '\0'; | |
391 | tmp++; | |
392 | ||
393 | if (!strcmp(kbuf, "add_node")) | |
394 | rv = do_add_node(tmp, count - (tmp - kbuf)); | |
395 | else if (!strcmp(kbuf, "remove_node")) | |
396 | rv = do_remove_node(tmp); | |
397 | else | |
398 | rv = -EINVAL; | |
399 | out: | |
400 | kfree(kbuf); | |
401 | return rv ? rv : count; | |
402 | } | |
403 | ||
404 | static struct file_operations ofdt_fops = { | |
405 | .write = ofdt_write | |
406 | }; | |
407 | ||
408 | /* create /proc/ppc64/ofdt write-only by root */ | |
409 | static int proc_ppc64_create_ofdt(void) | |
410 | { | |
411 | struct proc_dir_entry *ent; | |
412 | ||
413 | if (!(systemcfg->platform & PLATFORM_PSERIES)) | |
414 | return 0; | |
415 | ||
416 | ent = create_proc_entry("ppc64/ofdt", S_IWUSR, NULL); | |
417 | if (ent) { | |
418 | ent->nlink = 1; | |
419 | ent->data = NULL; | |
420 | ent->size = 0; | |
421 | ent->proc_fops = &ofdt_fops; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | __initcall(proc_ppc64_create_ofdt); |