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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> | |
1da177e4 LT |
15 | #include <linux/notifier.h> |
16 | #include <linux/proc_fs.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1cf3d8b3 | 18 | #include <linux/of.h> |
1da177e4 LT |
19 | |
20 | #include <asm/prom.h> | |
e8222502 | 21 | #include <asm/machdep.h> |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
46db2f86 | 23 | #include <asm/mmu.h> |
1da177e4 | 24 | |
948ad1ac | 25 | #include "of_helpers.h" |
1da177e4 | 26 | |
1da177e4 LT |
27 | static int pSeries_reconfig_add_node(const char *path, struct property *proplist) |
28 | { | |
29 | struct device_node *np; | |
30 | int err = -ENOMEM; | |
31 | ||
874ca6cd | 32 | np = kzalloc(sizeof(*np), GFP_KERNEL); |
1da177e4 LT |
33 | if (!np) |
34 | goto out_err; | |
35 | ||
74052173 | 36 | np->full_name = kstrdup(path, GFP_KERNEL); |
1da177e4 LT |
37 | if (!np->full_name) |
38 | goto out_err; | |
39 | ||
1da177e4 | 40 | np->properties = proplist; |
d3b814bb | 41 | of_node_set_flag(np, OF_DYNAMIC); |
97a9a717 | 42 | of_node_init(np); |
1da177e4 | 43 | |
948ad1ac | 44 | np->parent = pseries_of_derive_parent(path); |
1da177e4 LT |
45 | if (IS_ERR(np->parent)) { |
46 | err = PTR_ERR(np->parent); | |
47 | goto out_err; | |
48 | } | |
49 | ||
1cf3d8b3 | 50 | err = of_attach_node(np); |
3aef19f0 | 51 | if (err) { |
1da177e4 | 52 | printk(KERN_ERR "Failed to add device node %s\n", path); |
1da177e4 LT |
53 | goto out_err; |
54 | } | |
55 | ||
1da177e4 LT |
56 | of_node_put(np->parent); |
57 | ||
58 | return 0; | |
59 | ||
60 | out_err: | |
61 | if (np) { | |
62 | of_node_put(np->parent); | |
63 | kfree(np->full_name); | |
64 | kfree(np); | |
65 | } | |
66 | return err; | |
67 | } | |
68 | ||
69 | static int pSeries_reconfig_remove_node(struct device_node *np) | |
70 | { | |
71 | struct device_node *parent, *child; | |
72 | ||
73 | parent = of_get_parent(np); | |
74 | if (!parent) | |
75 | return -EINVAL; | |
76 | ||
77 | if ((child = of_get_next_child(np, NULL))) { | |
78 | of_node_put(child); | |
842decbd | 79 | of_node_put(parent); |
1da177e4 LT |
80 | return -EBUSY; |
81 | } | |
82 | ||
1da177e4 | 83 | of_detach_node(np); |
1da177e4 | 84 | of_node_put(parent); |
1da177e4 LT |
85 | return 0; |
86 | } | |
87 | ||
88 | /* | |
188917e1 | 89 | * /proc/powerpc/ofdt - yucky binary interface for adding and removing |
1da177e4 LT |
90 | * OF device nodes. Should be deprecated as soon as we get an |
91 | * in-kernel wrapper for the RTAS ibm,configure-connector call. | |
92 | */ | |
93 | ||
94 | static void release_prop_list(const struct property *prop) | |
95 | { | |
96 | struct property *next; | |
97 | for (; prop; prop = next) { | |
98 | next = prop->next; | |
99 | kfree(prop->name); | |
100 | kfree(prop->value); | |
101 | kfree(prop); | |
102 | } | |
103 | ||
104 | } | |
105 | ||
106 | /** | |
107 | * parse_next_property - process the next property from raw input buffer | |
108 | * @buf: input buffer, must be nul-terminated | |
109 | * @end: end of the input buffer + 1, for validation | |
110 | * @name: return value; set to property name in buf | |
111 | * @length: return value; set to length of value | |
112 | * @value: return value; set to the property value in buf | |
113 | * | |
114 | * Note that the caller must make copies of the name and value returned, | |
115 | * this function does no allocation or copying of the data. Return value | |
116 | * is set to the next name in buf, or NULL on error. | |
117 | */ | |
118 | static char * parse_next_property(char *buf, char *end, char **name, int *length, | |
119 | unsigned char **value) | |
120 | { | |
121 | char *tmp; | |
122 | ||
123 | *name = buf; | |
124 | ||
125 | tmp = strchr(buf, ' '); | |
126 | if (!tmp) { | |
127 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 128 | __func__, __LINE__); |
1da177e4 LT |
129 | return NULL; |
130 | } | |
131 | *tmp = '\0'; | |
132 | ||
133 | if (++tmp >= end) { | |
134 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 135 | __func__, __LINE__); |
1da177e4 LT |
136 | return NULL; |
137 | } | |
138 | ||
139 | /* now we're on the length */ | |
140 | *length = -1; | |
141 | *length = simple_strtoul(tmp, &tmp, 10); | |
142 | if (*length == -1) { | |
143 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 144 | __func__, __LINE__); |
1da177e4 LT |
145 | return NULL; |
146 | } | |
147 | if (*tmp != ' ' || ++tmp >= end) { | |
148 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 149 | __func__, __LINE__); |
1da177e4 LT |
150 | return NULL; |
151 | } | |
152 | ||
153 | /* now we're on the value */ | |
154 | *value = tmp; | |
155 | tmp += *length; | |
156 | if (tmp > end) { | |
157 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 158 | __func__, __LINE__); |
1da177e4 LT |
159 | return NULL; |
160 | } | |
161 | else if (tmp < end && *tmp != ' ' && *tmp != '\0') { | |
162 | printk(KERN_ERR "property parse failed in %s at line %d\n", | |
e48b1b45 | 163 | __func__, __LINE__); |
1da177e4 LT |
164 | return NULL; |
165 | } | |
166 | tmp++; | |
167 | ||
168 | /* and now we should be on the next name, or the end */ | |
169 | return tmp; | |
170 | } | |
171 | ||
172 | static struct property *new_property(const char *name, const int length, | |
173 | const unsigned char *value, struct property *last) | |
174 | { | |
f8485350 | 175 | struct property *new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
176 | |
177 | if (!new) | |
178 | return NULL; | |
1da177e4 | 179 | |
c22618a1 | 180 | if (!(new->name = kstrdup(name, GFP_KERNEL))) |
1da177e4 LT |
181 | goto cleanup; |
182 | if (!(new->value = kmalloc(length + 1, GFP_KERNEL))) | |
183 | goto cleanup; | |
184 | ||
1da177e4 LT |
185 | memcpy(new->value, value, length); |
186 | *(((char *)new->value) + length) = 0; | |
187 | new->length = length; | |
188 | new->next = last; | |
189 | return new; | |
190 | ||
191 | cleanup: | |
b2325fe1 JJ |
192 | kfree(new->name); |
193 | kfree(new->value); | |
1da177e4 LT |
194 | kfree(new); |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static int do_add_node(char *buf, size_t bufsize) | |
199 | { | |
200 | char *path, *end, *name; | |
201 | struct device_node *np; | |
202 | struct property *prop = NULL; | |
203 | unsigned char* value; | |
204 | int length, rv = 0; | |
205 | ||
206 | end = buf + bufsize; | |
207 | path = buf; | |
208 | buf = strchr(buf, ' '); | |
209 | if (!buf) | |
210 | return -EINVAL; | |
211 | *buf = '\0'; | |
212 | buf++; | |
213 | ||
214 | if ((np = of_find_node_by_path(path))) { | |
215 | of_node_put(np); | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | /* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */ | |
220 | while (buf < end && | |
221 | (buf = parse_next_property(buf, end, &name, &length, &value))) { | |
222 | struct property *last = prop; | |
223 | ||
224 | prop = new_property(name, length, value, last); | |
225 | if (!prop) { | |
226 | rv = -ENOMEM; | |
227 | prop = last; | |
228 | goto out; | |
229 | } | |
230 | } | |
231 | if (!buf) { | |
232 | rv = -EINVAL; | |
233 | goto out; | |
234 | } | |
235 | ||
236 | rv = pSeries_reconfig_add_node(path, prop); | |
237 | ||
238 | out: | |
239 | if (rv) | |
240 | release_prop_list(prop); | |
241 | return rv; | |
242 | } | |
243 | ||
244 | static int do_remove_node(char *buf) | |
245 | { | |
246 | struct device_node *node; | |
247 | int rv = -ENODEV; | |
248 | ||
249 | if ((node = of_find_node_by_path(buf))) | |
250 | rv = pSeries_reconfig_remove_node(node); | |
251 | ||
252 | of_node_put(node); | |
253 | return rv; | |
254 | } | |
255 | ||
610d9151 DB |
256 | static char *parse_node(char *buf, size_t bufsize, struct device_node **npp) |
257 | { | |
258 | char *handle_str; | |
259 | phandle handle; | |
260 | *npp = NULL; | |
261 | ||
262 | handle_str = buf; | |
263 | ||
264 | buf = strchr(buf, ' '); | |
265 | if (!buf) | |
266 | return NULL; | |
267 | *buf = '\0'; | |
268 | buf++; | |
269 | ||
4b6e805e | 270 | handle = simple_strtoul(handle_str, NULL, 0); |
610d9151 DB |
271 | |
272 | *npp = of_find_node_by_phandle(handle); | |
273 | return buf; | |
274 | } | |
275 | ||
276 | static int do_add_property(char *buf, size_t bufsize) | |
277 | { | |
278 | struct property *prop = NULL; | |
279 | struct device_node *np; | |
280 | unsigned char *value; | |
281 | char *name, *end; | |
282 | int length; | |
283 | end = buf + bufsize; | |
284 | buf = parse_node(buf, bufsize, &np); | |
285 | ||
286 | if (!np) | |
287 | return -ENODEV; | |
288 | ||
289 | if (parse_next_property(buf, end, &name, &length, &value) == NULL) | |
290 | return -EINVAL; | |
291 | ||
292 | prop = new_property(name, length, value, NULL); | |
293 | if (!prop) | |
294 | return -ENOMEM; | |
295 | ||
79d1c712 | 296 | of_add_property(np, prop); |
610d9151 DB |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int do_remove_property(char *buf, size_t bufsize) | |
302 | { | |
303 | struct device_node *np; | |
304 | char *tmp; | |
610d9151 DB |
305 | buf = parse_node(buf, bufsize, &np); |
306 | ||
307 | if (!np) | |
308 | return -ENODEV; | |
309 | ||
310 | tmp = strchr(buf,' '); | |
311 | if (tmp) | |
312 | *tmp = '\0'; | |
313 | ||
314 | if (strlen(buf) == 0) | |
315 | return -EINVAL; | |
316 | ||
925e2d1d | 317 | return of_remove_property(np, of_find_property(np, buf, NULL)); |
610d9151 DB |
318 | } |
319 | ||
320 | static int do_update_property(char *buf, size_t bufsize) | |
321 | { | |
322 | struct device_node *np; | |
323 | unsigned char *value; | |
3c3f67ea | 324 | char *name, *end, *next_prop; |
1cf3d8b3 | 325 | int length; |
475d0094 | 326 | struct property *newprop; |
610d9151 DB |
327 | buf = parse_node(buf, bufsize, &np); |
328 | end = buf + bufsize; | |
329 | ||
330 | if (!np) | |
331 | return -ENODEV; | |
332 | ||
3c3f67ea NF |
333 | next_prop = parse_next_property(buf, end, &name, &length, &value); |
334 | if (!next_prop) | |
610d9151 DB |
335 | return -EINVAL; |
336 | ||
475d0094 DA |
337 | if (!strlen(name)) |
338 | return -ENODEV; | |
339 | ||
610d9151 DB |
340 | newprop = new_property(name, length, value, NULL); |
341 | if (!newprop) | |
342 | return -ENOMEM; | |
343 | ||
46db2f86 BK |
344 | if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size")) |
345 | slb_set_size(*(int *)value); | |
346 | ||
79d1c712 | 347 | return of_update_property(np, newprop); |
610d9151 DB |
348 | } |
349 | ||
1da177e4 LT |
350 | /** |
351 | * ofdt_write - perform operations on the Open Firmware device tree | |
352 | * | |
353 | * @file: not used | |
354 | * @buf: command and arguments | |
355 | * @count: size of the command buffer | |
356 | * @off: not used | |
357 | * | |
358 | * Operations supported at this time are addition and removal of | |
359 | * whole nodes along with their properties. Operations on individual | |
360 | * properties are not implemented (yet). | |
361 | */ | |
362 | static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count, | |
363 | loff_t *off) | |
364 | { | |
365 | int rv = 0; | |
366 | char *kbuf; | |
367 | char *tmp; | |
368 | ||
369 | if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) { | |
370 | rv = -ENOMEM; | |
371 | goto out; | |
372 | } | |
373 | if (copy_from_user(kbuf, buf, count)) { | |
374 | rv = -EFAULT; | |
375 | goto out; | |
376 | } | |
377 | ||
378 | kbuf[count] = '\0'; | |
379 | ||
380 | tmp = strchr(kbuf, ' '); | |
381 | if (!tmp) { | |
382 | rv = -EINVAL; | |
383 | goto out; | |
384 | } | |
385 | *tmp = '\0'; | |
386 | tmp++; | |
387 | ||
388 | if (!strcmp(kbuf, "add_node")) | |
389 | rv = do_add_node(tmp, count - (tmp - kbuf)); | |
390 | else if (!strcmp(kbuf, "remove_node")) | |
391 | rv = do_remove_node(tmp); | |
610d9151 DB |
392 | else if (!strcmp(kbuf, "add_property")) |
393 | rv = do_add_property(tmp, count - (tmp - kbuf)); | |
394 | else if (!strcmp(kbuf, "remove_property")) | |
395 | rv = do_remove_property(tmp, count - (tmp - kbuf)); | |
396 | else if (!strcmp(kbuf, "update_property")) | |
397 | rv = do_update_property(tmp, count - (tmp - kbuf)); | |
1da177e4 LT |
398 | else |
399 | rv = -EINVAL; | |
400 | out: | |
401 | kfree(kbuf); | |
402 | return rv ? rv : count; | |
403 | } | |
404 | ||
5dfe4c96 | 405 | static const struct file_operations ofdt_fops = { |
6038f373 AB |
406 | .write = ofdt_write, |
407 | .llseek = noop_llseek, | |
1da177e4 LT |
408 | }; |
409 | ||
188917e1 | 410 | /* create /proc/powerpc/ofdt write-only by root */ |
1da177e4 LT |
411 | static int proc_ppc64_create_ofdt(void) |
412 | { | |
413 | struct proc_dir_entry *ent; | |
414 | ||
188917e1 | 415 | ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops); |
66747138 | 416 | if (ent) |
271a15ea | 417 | proc_set_size(ent, 0); |
1da177e4 LT |
418 | |
419 | return 0; | |
420 | } | |
8e83e905 | 421 | machine_device_initcall(pseries, proc_ppc64_create_ofdt); |