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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/resource.c | |
3 | * | |
4 | * Copyright (C) 1999 Linus Torvalds | |
5 | * Copyright (C) 1999 Martin Mares <mj@ucw.cz> | |
6 | * | |
7 | * Arbitrary resource management. | |
8 | */ | |
9 | ||
1da177e4 | 10 | #include <linux/module.h> |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/ioport.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/proc_fs.h> | |
8b6d043b | 18 | #include <linux/sched.h> |
1da177e4 | 19 | #include <linux/seq_file.h> |
9ac7849e | 20 | #include <linux/device.h> |
d68612b2 | 21 | #include <linux/pfn.h> |
1da177e4 LT |
22 | #include <asm/io.h> |
23 | ||
24 | ||
25 | struct resource ioport_resource = { | |
26 | .name = "PCI IO", | |
6550e07f | 27 | .start = 0, |
1da177e4 LT |
28 | .end = IO_SPACE_LIMIT, |
29 | .flags = IORESOURCE_IO, | |
30 | }; | |
1da177e4 LT |
31 | EXPORT_SYMBOL(ioport_resource); |
32 | ||
33 | struct resource iomem_resource = { | |
34 | .name = "PCI mem", | |
6550e07f GKH |
35 | .start = 0, |
36 | .end = -1, | |
1da177e4 LT |
37 | .flags = IORESOURCE_MEM, |
38 | }; | |
1da177e4 LT |
39 | EXPORT_SYMBOL(iomem_resource); |
40 | ||
41 | static DEFINE_RWLOCK(resource_lock); | |
42 | ||
1da177e4 LT |
43 | static void *r_next(struct seq_file *m, void *v, loff_t *pos) |
44 | { | |
45 | struct resource *p = v; | |
46 | (*pos)++; | |
47 | if (p->child) | |
48 | return p->child; | |
49 | while (!p->sibling && p->parent) | |
50 | p = p->parent; | |
51 | return p->sibling; | |
52 | } | |
53 | ||
13eb8375 IM |
54 | #ifdef CONFIG_PROC_FS |
55 | ||
56 | enum { MAX_IORES_LEVEL = 5 }; | |
57 | ||
1da177e4 LT |
58 | static void *r_start(struct seq_file *m, loff_t *pos) |
59 | __acquires(resource_lock) | |
60 | { | |
61 | struct resource *p = m->private; | |
62 | loff_t l = 0; | |
63 | read_lock(&resource_lock); | |
64 | for (p = p->child; p && l < *pos; p = r_next(m, p, &l)) | |
65 | ; | |
66 | return p; | |
67 | } | |
68 | ||
69 | static void r_stop(struct seq_file *m, void *v) | |
70 | __releases(resource_lock) | |
71 | { | |
72 | read_unlock(&resource_lock); | |
73 | } | |
74 | ||
75 | static int r_show(struct seq_file *m, void *v) | |
76 | { | |
77 | struct resource *root = m->private; | |
78 | struct resource *r = v, *p; | |
79 | int width = root->end < 0x10000 ? 4 : 8; | |
80 | int depth; | |
81 | ||
82 | for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent) | |
83 | if (p->parent == root) | |
84 | break; | |
685143ac | 85 | seq_printf(m, "%*s%0*llx-%0*llx : %s\n", |
1da177e4 | 86 | depth * 2, "", |
685143ac GKH |
87 | width, (unsigned long long) r->start, |
88 | width, (unsigned long long) r->end, | |
1da177e4 LT |
89 | r->name ? r->name : "<BAD>"); |
90 | return 0; | |
91 | } | |
92 | ||
15ad7cdc | 93 | static const struct seq_operations resource_op = { |
1da177e4 LT |
94 | .start = r_start, |
95 | .next = r_next, | |
96 | .stop = r_stop, | |
97 | .show = r_show, | |
98 | }; | |
99 | ||
100 | static int ioports_open(struct inode *inode, struct file *file) | |
101 | { | |
102 | int res = seq_open(file, &resource_op); | |
103 | if (!res) { | |
104 | struct seq_file *m = file->private_data; | |
105 | m->private = &ioport_resource; | |
106 | } | |
107 | return res; | |
108 | } | |
109 | ||
110 | static int iomem_open(struct inode *inode, struct file *file) | |
111 | { | |
112 | int res = seq_open(file, &resource_op); | |
113 | if (!res) { | |
114 | struct seq_file *m = file->private_data; | |
115 | m->private = &iomem_resource; | |
116 | } | |
117 | return res; | |
118 | } | |
119 | ||
15ad7cdc | 120 | static const struct file_operations proc_ioports_operations = { |
1da177e4 LT |
121 | .open = ioports_open, |
122 | .read = seq_read, | |
123 | .llseek = seq_lseek, | |
124 | .release = seq_release, | |
125 | }; | |
126 | ||
15ad7cdc | 127 | static const struct file_operations proc_iomem_operations = { |
1da177e4 LT |
128 | .open = iomem_open, |
129 | .read = seq_read, | |
130 | .llseek = seq_lseek, | |
131 | .release = seq_release, | |
132 | }; | |
133 | ||
134 | static int __init ioresources_init(void) | |
135 | { | |
c33fff0a DL |
136 | proc_create("ioports", 0, NULL, &proc_ioports_operations); |
137 | proc_create("iomem", 0, NULL, &proc_iomem_operations); | |
1da177e4 LT |
138 | return 0; |
139 | } | |
140 | __initcall(ioresources_init); | |
141 | ||
142 | #endif /* CONFIG_PROC_FS */ | |
143 | ||
144 | /* Return the conflict entry if you can't request it */ | |
145 | static struct resource * __request_resource(struct resource *root, struct resource *new) | |
146 | { | |
d75fc8bb GKH |
147 | resource_size_t start = new->start; |
148 | resource_size_t end = new->end; | |
1da177e4 LT |
149 | struct resource *tmp, **p; |
150 | ||
151 | if (end < start) | |
152 | return root; | |
153 | if (start < root->start) | |
154 | return root; | |
155 | if (end > root->end) | |
156 | return root; | |
157 | p = &root->child; | |
158 | for (;;) { | |
159 | tmp = *p; | |
160 | if (!tmp || tmp->start > end) { | |
161 | new->sibling = tmp; | |
162 | *p = new; | |
163 | new->parent = root; | |
164 | return NULL; | |
165 | } | |
166 | p = &tmp->sibling; | |
167 | if (tmp->end < start) | |
168 | continue; | |
169 | return tmp; | |
170 | } | |
171 | } | |
172 | ||
173 | static int __release_resource(struct resource *old) | |
174 | { | |
175 | struct resource *tmp, **p; | |
176 | ||
177 | p = &old->parent->child; | |
178 | for (;;) { | |
179 | tmp = *p; | |
180 | if (!tmp) | |
181 | break; | |
182 | if (tmp == old) { | |
183 | *p = tmp->sibling; | |
184 | old->parent = NULL; | |
185 | return 0; | |
186 | } | |
187 | p = &tmp->sibling; | |
188 | } | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
5eeec0ec YL |
192 | static void __release_child_resources(struct resource *r) |
193 | { | |
194 | struct resource *tmp, *p; | |
195 | resource_size_t size; | |
196 | ||
197 | p = r->child; | |
198 | r->child = NULL; | |
199 | while (p) { | |
200 | tmp = p; | |
201 | p = p->sibling; | |
202 | ||
203 | tmp->parent = NULL; | |
204 | tmp->sibling = NULL; | |
205 | __release_child_resources(tmp); | |
206 | ||
207 | printk(KERN_DEBUG "release child resource %pR\n", tmp); | |
208 | /* need to restore size, and keep flags */ | |
209 | size = resource_size(tmp); | |
210 | tmp->start = 0; | |
211 | tmp->end = size - 1; | |
212 | } | |
213 | } | |
214 | ||
215 | void release_child_resources(struct resource *r) | |
216 | { | |
217 | write_lock(&resource_lock); | |
218 | __release_child_resources(r); | |
219 | write_unlock(&resource_lock); | |
220 | } | |
221 | ||
e1ca66d1 | 222 | /** |
66f1207b | 223 | * request_resource_conflict - request and reserve an I/O or memory resource |
e1ca66d1 RD |
224 | * @root: root resource descriptor |
225 | * @new: resource descriptor desired by caller | |
226 | * | |
66f1207b | 227 | * Returns 0 for success, conflict resource on error. |
e1ca66d1 | 228 | */ |
66f1207b | 229 | struct resource *request_resource_conflict(struct resource *root, struct resource *new) |
1da177e4 LT |
230 | { |
231 | struct resource *conflict; | |
232 | ||
233 | write_lock(&resource_lock); | |
234 | conflict = __request_resource(root, new); | |
235 | write_unlock(&resource_lock); | |
66f1207b BH |
236 | return conflict; |
237 | } | |
238 | ||
239 | /** | |
240 | * request_resource - request and reserve an I/O or memory resource | |
241 | * @root: root resource descriptor | |
242 | * @new: resource descriptor desired by caller | |
243 | * | |
244 | * Returns 0 for success, negative error code on error. | |
245 | */ | |
246 | int request_resource(struct resource *root, struct resource *new) | |
247 | { | |
248 | struct resource *conflict; | |
249 | ||
250 | conflict = request_resource_conflict(root, new); | |
1da177e4 LT |
251 | return conflict ? -EBUSY : 0; |
252 | } | |
253 | ||
254 | EXPORT_SYMBOL(request_resource); | |
255 | ||
e1ca66d1 RD |
256 | /** |
257 | * release_resource - release a previously reserved resource | |
258 | * @old: resource pointer | |
259 | */ | |
1da177e4 LT |
260 | int release_resource(struct resource *old) |
261 | { | |
262 | int retval; | |
263 | ||
264 | write_lock(&resource_lock); | |
265 | retval = __release_resource(old); | |
266 | write_unlock(&resource_lock); | |
267 | return retval; | |
268 | } | |
269 | ||
270 | EXPORT_SYMBOL(release_resource); | |
271 | ||
908eedc6 | 272 | #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) |
2842f114 KH |
273 | /* |
274 | * Finds the lowest memory reosurce exists within [res->start.res->end) | |
908eedc6 | 275 | * the caller must specify res->start, res->end, res->flags and "name". |
2842f114 KH |
276 | * If found, returns 0, res is overwritten, if not found, returns -1. |
277 | */ | |
908eedc6 | 278 | static int find_next_system_ram(struct resource *res, char *name) |
2842f114 KH |
279 | { |
280 | resource_size_t start, end; | |
281 | struct resource *p; | |
282 | ||
283 | BUG_ON(!res); | |
284 | ||
285 | start = res->start; | |
286 | end = res->end; | |
58c1b5b0 | 287 | BUG_ON(start >= end); |
2842f114 KH |
288 | |
289 | read_lock(&resource_lock); | |
290 | for (p = iomem_resource.child; p ; p = p->sibling) { | |
291 | /* system ram is just marked as IORESOURCE_MEM */ | |
292 | if (p->flags != res->flags) | |
293 | continue; | |
908eedc6 KH |
294 | if (name && strcmp(p->name, name)) |
295 | continue; | |
2842f114 KH |
296 | if (p->start > end) { |
297 | p = NULL; | |
298 | break; | |
299 | } | |
58c1b5b0 | 300 | if ((p->end >= start) && (p->start < end)) |
2842f114 KH |
301 | break; |
302 | } | |
303 | read_unlock(&resource_lock); | |
304 | if (!p) | |
305 | return -1; | |
306 | /* copy data */ | |
0f04ab5e KH |
307 | if (res->start < p->start) |
308 | res->start = p->start; | |
309 | if (res->end > p->end) | |
310 | res->end = p->end; | |
2842f114 KH |
311 | return 0; |
312 | } | |
908eedc6 KH |
313 | |
314 | /* | |
315 | * This function calls callback against all memory range of "System RAM" | |
316 | * which are marked as IORESOURCE_MEM and IORESOUCE_BUSY. | |
317 | * Now, this function is only for "System RAM". | |
318 | */ | |
319 | int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, | |
320 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
75884fb1 KH |
321 | { |
322 | struct resource res; | |
37b99dd5 | 323 | unsigned long pfn, end_pfn; |
75884fb1 KH |
324 | u64 orig_end; |
325 | int ret = -1; | |
908eedc6 | 326 | |
75884fb1 KH |
327 | res.start = (u64) start_pfn << PAGE_SHIFT; |
328 | res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; | |
887c3cb1 | 329 | res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
75884fb1 | 330 | orig_end = res.end; |
908eedc6 KH |
331 | while ((res.start < res.end) && |
332 | (find_next_system_ram(&res, "System RAM") >= 0)) { | |
37b99dd5 WF |
333 | pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; |
334 | end_pfn = (res.end + 1) >> PAGE_SHIFT; | |
335 | if (end_pfn > pfn) | |
f4149660 | 336 | ret = (*func)(pfn, end_pfn - pfn, arg); |
75884fb1 KH |
337 | if (ret) |
338 | break; | |
339 | res.start = res.end + 1; | |
340 | res.end = orig_end; | |
341 | } | |
342 | return ret; | |
343 | } | |
344 | ||
2842f114 KH |
345 | #endif |
346 | ||
61ef2489 WF |
347 | static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg) |
348 | { | |
349 | return 1; | |
350 | } | |
351 | /* | |
352 | * This generic page_is_ram() returns true if specified address is | |
353 | * registered as "System RAM" in iomem_resource list. | |
354 | */ | |
e5273007 | 355 | int __weak page_is_ram(unsigned long pfn) |
61ef2489 WF |
356 | { |
357 | return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1; | |
358 | } | |
359 | ||
a9cea017 BH |
360 | static resource_size_t simple_align_resource(void *data, |
361 | const struct resource *avail, | |
362 | resource_size_t size, | |
363 | resource_size_t align) | |
364 | { | |
365 | return avail->start; | |
366 | } | |
367 | ||
1da177e4 LT |
368 | /* |
369 | * Find empty slot in the resource tree given range and alignment. | |
370 | */ | |
371 | static int find_resource(struct resource *root, struct resource *new, | |
d75fc8bb GKH |
372 | resource_size_t size, resource_size_t min, |
373 | resource_size_t max, resource_size_t align, | |
b26b2d49 | 374 | resource_size_t (*alignf)(void *, |
3b7a17fc | 375 | const struct resource *, |
b26b2d49 DB |
376 | resource_size_t, |
377 | resource_size_t), | |
1da177e4 LT |
378 | void *alignf_data) |
379 | { | |
380 | struct resource *this = root->child; | |
0e2c8b8f | 381 | struct resource tmp = *new; |
1da177e4 | 382 | |
0e2c8b8f | 383 | tmp.start = root->start; |
1da177e4 LT |
384 | /* |
385 | * Skip past an allocated resource that starts at 0, since the assignment | |
0e2c8b8f | 386 | * of this->start - 1 to tmp->end below would cause an underflow. |
1da177e4 LT |
387 | */ |
388 | if (this && this->start == 0) { | |
0e2c8b8f | 389 | tmp.start = this->end + 1; |
1da177e4 LT |
390 | this = this->sibling; |
391 | } | |
392 | for(;;) { | |
393 | if (this) | |
0e2c8b8f | 394 | tmp.end = this->start - 1; |
1da177e4 | 395 | else |
0e2c8b8f DB |
396 | tmp.end = root->end; |
397 | if (tmp.start < min) | |
398 | tmp.start = min; | |
399 | if (tmp.end > max) | |
400 | tmp.end = max; | |
401 | tmp.start = ALIGN(tmp.start, align); | |
a9cea017 BH |
402 | |
403 | tmp.start = alignf(alignf_data, &tmp, size, align); | |
0e2c8b8f DB |
404 | if (tmp.start < tmp.end && tmp.end - tmp.start >= size - 1) { |
405 | new->start = tmp.start; | |
406 | new->end = tmp.start + size - 1; | |
1da177e4 LT |
407 | return 0; |
408 | } | |
409 | if (!this) | |
410 | break; | |
0e2c8b8f | 411 | tmp.start = this->end + 1; |
1da177e4 LT |
412 | this = this->sibling; |
413 | } | |
414 | return -EBUSY; | |
415 | } | |
416 | ||
e1ca66d1 RD |
417 | /** |
418 | * allocate_resource - allocate empty slot in the resource tree given range & alignment | |
419 | * @root: root resource descriptor | |
420 | * @new: resource descriptor desired by caller | |
421 | * @size: requested resource region size | |
422 | * @min: minimum size to allocate | |
423 | * @max: maximum size to allocate | |
424 | * @align: alignment requested, in bytes | |
425 | * @alignf: alignment function, optional, called if not NULL | |
426 | * @alignf_data: arbitrary data to pass to the @alignf function | |
1da177e4 LT |
427 | */ |
428 | int allocate_resource(struct resource *root, struct resource *new, | |
d75fc8bb GKH |
429 | resource_size_t size, resource_size_t min, |
430 | resource_size_t max, resource_size_t align, | |
b26b2d49 | 431 | resource_size_t (*alignf)(void *, |
3b7a17fc | 432 | const struct resource *, |
b26b2d49 DB |
433 | resource_size_t, |
434 | resource_size_t), | |
1da177e4 LT |
435 | void *alignf_data) |
436 | { | |
437 | int err; | |
438 | ||
a9cea017 BH |
439 | if (!alignf) |
440 | alignf = simple_align_resource; | |
441 | ||
1da177e4 LT |
442 | write_lock(&resource_lock); |
443 | err = find_resource(root, new, size, min, max, align, alignf, alignf_data); | |
444 | if (err >= 0 && __request_resource(root, new)) | |
445 | err = -EBUSY; | |
446 | write_unlock(&resource_lock); | |
447 | return err; | |
448 | } | |
449 | ||
450 | EXPORT_SYMBOL(allocate_resource); | |
451 | ||
bef69ea0 LT |
452 | /* |
453 | * Insert a resource into the resource tree. If successful, return NULL, | |
454 | * otherwise return the conflicting resource (compare to __request_resource()) | |
1da177e4 | 455 | */ |
bef69ea0 | 456 | static struct resource * __insert_resource(struct resource *parent, struct resource *new) |
1da177e4 | 457 | { |
1da177e4 LT |
458 | struct resource *first, *next; |
459 | ||
d33b6fba | 460 | for (;; parent = first) { |
d33b6fba MW |
461 | first = __request_resource(parent, new); |
462 | if (!first) | |
bef69ea0 | 463 | return first; |
d33b6fba | 464 | |
d33b6fba | 465 | if (first == parent) |
bef69ea0 | 466 | return first; |
d33b6fba MW |
467 | |
468 | if ((first->start > new->start) || (first->end < new->end)) | |
469 | break; | |
470 | if ((first->start == new->start) && (first->end == new->end)) | |
471 | break; | |
1da177e4 LT |
472 | } |
473 | ||
474 | for (next = first; ; next = next->sibling) { | |
475 | /* Partial overlap? Bad, and unfixable */ | |
476 | if (next->start < new->start || next->end > new->end) | |
bef69ea0 | 477 | return next; |
1da177e4 LT |
478 | if (!next->sibling) |
479 | break; | |
480 | if (next->sibling->start > new->end) | |
481 | break; | |
482 | } | |
483 | ||
1da177e4 LT |
484 | new->parent = parent; |
485 | new->sibling = next->sibling; | |
486 | new->child = first; | |
487 | ||
488 | next->sibling = NULL; | |
489 | for (next = first; next; next = next->sibling) | |
490 | next->parent = new; | |
491 | ||
492 | if (parent->child == first) { | |
493 | parent->child = new; | |
494 | } else { | |
495 | next = parent->child; | |
496 | while (next->sibling != first) | |
497 | next = next->sibling; | |
498 | next->sibling = new; | |
499 | } | |
bef69ea0 LT |
500 | return NULL; |
501 | } | |
1da177e4 | 502 | |
bef69ea0 | 503 | /** |
66f1207b | 504 | * insert_resource_conflict - Inserts resource in the resource tree |
bef69ea0 LT |
505 | * @parent: parent of the new resource |
506 | * @new: new resource to insert | |
507 | * | |
66f1207b | 508 | * Returns 0 on success, conflict resource if the resource can't be inserted. |
bef69ea0 | 509 | * |
66f1207b | 510 | * This function is equivalent to request_resource_conflict when no conflict |
bef69ea0 LT |
511 | * happens. If a conflict happens, and the conflicting resources |
512 | * entirely fit within the range of the new resource, then the new | |
513 | * resource is inserted and the conflicting resources become children of | |
514 | * the new resource. | |
515 | */ | |
66f1207b | 516 | struct resource *insert_resource_conflict(struct resource *parent, struct resource *new) |
bef69ea0 LT |
517 | { |
518 | struct resource *conflict; | |
519 | ||
520 | write_lock(&resource_lock); | |
521 | conflict = __insert_resource(parent, new); | |
522 | write_unlock(&resource_lock); | |
66f1207b BH |
523 | return conflict; |
524 | } | |
525 | ||
526 | /** | |
527 | * insert_resource - Inserts a resource in the resource tree | |
528 | * @parent: parent of the new resource | |
529 | * @new: new resource to insert | |
530 | * | |
531 | * Returns 0 on success, -EBUSY if the resource can't be inserted. | |
532 | */ | |
533 | int insert_resource(struct resource *parent, struct resource *new) | |
534 | { | |
535 | struct resource *conflict; | |
536 | ||
537 | conflict = insert_resource_conflict(parent, new); | |
bef69ea0 LT |
538 | return conflict ? -EBUSY : 0; |
539 | } | |
540 | ||
541 | /** | |
542 | * insert_resource_expand_to_fit - Insert a resource into the resource tree | |
6781f4ae | 543 | * @root: root resource descriptor |
bef69ea0 LT |
544 | * @new: new resource to insert |
545 | * | |
546 | * Insert a resource into the resource tree, possibly expanding it in order | |
547 | * to make it encompass any conflicting resources. | |
548 | */ | |
549 | void insert_resource_expand_to_fit(struct resource *root, struct resource *new) | |
550 | { | |
551 | if (new->parent) | |
552 | return; | |
553 | ||
554 | write_lock(&resource_lock); | |
555 | for (;;) { | |
556 | struct resource *conflict; | |
557 | ||
558 | conflict = __insert_resource(root, new); | |
559 | if (!conflict) | |
560 | break; | |
561 | if (conflict == root) | |
562 | break; | |
563 | ||
564 | /* Ok, expand resource to cover the conflict, then try again .. */ | |
565 | if (conflict->start < new->start) | |
566 | new->start = conflict->start; | |
567 | if (conflict->end > new->end) | |
568 | new->end = conflict->end; | |
569 | ||
570 | printk("Expanded resource %s due to conflict with %s\n", new->name, conflict->name); | |
571 | } | |
1da177e4 | 572 | write_unlock(&resource_lock); |
1da177e4 LT |
573 | } |
574 | ||
e1ca66d1 RD |
575 | /** |
576 | * adjust_resource - modify a resource's start and size | |
577 | * @res: resource to modify | |
578 | * @start: new start value | |
579 | * @size: new size | |
580 | * | |
1da177e4 | 581 | * Given an existing resource, change its start and size to match the |
e1ca66d1 RD |
582 | * arguments. Returns 0 on success, -EBUSY if it can't fit. |
583 | * Existing children of the resource are assumed to be immutable. | |
1da177e4 | 584 | */ |
d75fc8bb | 585 | int adjust_resource(struct resource *res, resource_size_t start, resource_size_t size) |
1da177e4 LT |
586 | { |
587 | struct resource *tmp, *parent = res->parent; | |
d75fc8bb | 588 | resource_size_t end = start + size - 1; |
1da177e4 LT |
589 | int result = -EBUSY; |
590 | ||
591 | write_lock(&resource_lock); | |
592 | ||
593 | if ((start < parent->start) || (end > parent->end)) | |
594 | goto out; | |
595 | ||
596 | for (tmp = res->child; tmp; tmp = tmp->sibling) { | |
597 | if ((tmp->start < start) || (tmp->end > end)) | |
598 | goto out; | |
599 | } | |
600 | ||
601 | if (res->sibling && (res->sibling->start <= end)) | |
602 | goto out; | |
603 | ||
604 | tmp = parent->child; | |
605 | if (tmp != res) { | |
606 | while (tmp->sibling != res) | |
607 | tmp = tmp->sibling; | |
608 | if (start <= tmp->end) | |
609 | goto out; | |
610 | } | |
611 | ||
612 | res->start = start; | |
613 | res->end = end; | |
614 | result = 0; | |
615 | ||
616 | out: | |
617 | write_unlock(&resource_lock); | |
618 | return result; | |
619 | } | |
620 | ||
268364a0 YL |
621 | static void __init __reserve_region_with_split(struct resource *root, |
622 | resource_size_t start, resource_size_t end, | |
623 | const char *name) | |
624 | { | |
625 | struct resource *parent = root; | |
626 | struct resource *conflict; | |
42c02023 | 627 | struct resource *res = kzalloc(sizeof(*res), GFP_ATOMIC); |
268364a0 YL |
628 | |
629 | if (!res) | |
630 | return; | |
631 | ||
632 | res->name = name; | |
633 | res->start = start; | |
634 | res->end = end; | |
635 | res->flags = IORESOURCE_BUSY; | |
636 | ||
ff54250a LT |
637 | conflict = __request_resource(parent, res); |
638 | if (!conflict) | |
639 | return; | |
268364a0 | 640 | |
ff54250a LT |
641 | /* failed, split and try again */ |
642 | kfree(res); | |
268364a0 | 643 | |
ff54250a LT |
644 | /* conflict covered whole area */ |
645 | if (conflict->start <= start && conflict->end >= end) | |
646 | return; | |
268364a0 | 647 | |
ff54250a LT |
648 | if (conflict->start > start) |
649 | __reserve_region_with_split(root, start, conflict->start-1, name); | |
650 | if (conflict->end < end) | |
651 | __reserve_region_with_split(root, conflict->end+1, end, name); | |
268364a0 YL |
652 | } |
653 | ||
bea92112 | 654 | void __init reserve_region_with_split(struct resource *root, |
268364a0 YL |
655 | resource_size_t start, resource_size_t end, |
656 | const char *name) | |
657 | { | |
658 | write_lock(&resource_lock); | |
659 | __reserve_region_with_split(root, start, end, name); | |
660 | write_unlock(&resource_lock); | |
661 | } | |
662 | ||
1da177e4 LT |
663 | EXPORT_SYMBOL(adjust_resource); |
664 | ||
88452565 IK |
665 | /** |
666 | * resource_alignment - calculate resource's alignment | |
667 | * @res: resource pointer | |
668 | * | |
669 | * Returns alignment on success, 0 (invalid alignment) on failure. | |
670 | */ | |
671 | resource_size_t resource_alignment(struct resource *res) | |
672 | { | |
673 | switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) { | |
674 | case IORESOURCE_SIZEALIGN: | |
1a4e564b | 675 | return resource_size(res); |
88452565 IK |
676 | case IORESOURCE_STARTALIGN: |
677 | return res->start; | |
678 | default: | |
679 | return 0; | |
680 | } | |
681 | } | |
682 | ||
1da177e4 LT |
683 | /* |
684 | * This is compatibility stuff for IO resources. | |
685 | * | |
686 | * Note how this, unlike the above, knows about | |
687 | * the IO flag meanings (busy etc). | |
688 | * | |
e1ca66d1 | 689 | * request_region creates a new busy region. |
1da177e4 | 690 | * |
e1ca66d1 | 691 | * check_region returns non-zero if the area is already busy. |
1da177e4 | 692 | * |
e1ca66d1 RD |
693 | * release_region releases a matching busy region. |
694 | */ | |
695 | ||
8b6d043b AC |
696 | static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); |
697 | ||
e1ca66d1 RD |
698 | /** |
699 | * __request_region - create a new busy resource region | |
700 | * @parent: parent resource descriptor | |
701 | * @start: resource start address | |
702 | * @n: resource region size | |
703 | * @name: reserving caller's ID string | |
6ae301e8 | 704 | * @flags: IO resource flags |
1da177e4 | 705 | */ |
d75fc8bb GKH |
706 | struct resource * __request_region(struct resource *parent, |
707 | resource_size_t start, resource_size_t n, | |
e8de1481 | 708 | const char *name, int flags) |
1da177e4 | 709 | { |
8b6d043b | 710 | DECLARE_WAITQUEUE(wait, current); |
dd392710 | 711 | struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL); |
1da177e4 | 712 | |
c26ec88e BH |
713 | if (!res) |
714 | return NULL; | |
715 | ||
716 | res->name = name; | |
717 | res->start = start; | |
718 | res->end = start + n - 1; | |
719 | res->flags = IORESOURCE_BUSY; | |
e8de1481 | 720 | res->flags |= flags; |
c26ec88e BH |
721 | |
722 | write_lock(&resource_lock); | |
723 | ||
724 | for (;;) { | |
725 | struct resource *conflict; | |
726 | ||
727 | conflict = __request_resource(parent, res); | |
728 | if (!conflict) | |
1da177e4 | 729 | break; |
c26ec88e BH |
730 | if (conflict != parent) { |
731 | parent = conflict; | |
732 | if (!(conflict->flags & IORESOURCE_BUSY)) | |
733 | continue; | |
1da177e4 | 734 | } |
8b6d043b AC |
735 | if (conflict->flags & flags & IORESOURCE_MUXED) { |
736 | add_wait_queue(&muxed_resource_wait, &wait); | |
737 | write_unlock(&resource_lock); | |
738 | set_current_state(TASK_UNINTERRUPTIBLE); | |
739 | schedule(); | |
740 | remove_wait_queue(&muxed_resource_wait, &wait); | |
741 | write_lock(&resource_lock); | |
742 | continue; | |
743 | } | |
c26ec88e BH |
744 | /* Uhhuh, that didn't work out.. */ |
745 | kfree(res); | |
746 | res = NULL; | |
747 | break; | |
1da177e4 | 748 | } |
c26ec88e | 749 | write_unlock(&resource_lock); |
1da177e4 LT |
750 | return res; |
751 | } | |
1da177e4 LT |
752 | EXPORT_SYMBOL(__request_region); |
753 | ||
e1ca66d1 RD |
754 | /** |
755 | * __check_region - check if a resource region is busy or free | |
756 | * @parent: parent resource descriptor | |
757 | * @start: resource start address | |
758 | * @n: resource region size | |
759 | * | |
760 | * Returns 0 if the region is free at the moment it is checked, | |
761 | * returns %-EBUSY if the region is busy. | |
762 | * | |
763 | * NOTE: | |
764 | * This function is deprecated because its use is racy. | |
765 | * Even if it returns 0, a subsequent call to request_region() | |
766 | * may fail because another driver etc. just allocated the region. | |
767 | * Do NOT use it. It will be removed from the kernel. | |
768 | */ | |
d75fc8bb GKH |
769 | int __check_region(struct resource *parent, resource_size_t start, |
770 | resource_size_t n) | |
1da177e4 LT |
771 | { |
772 | struct resource * res; | |
773 | ||
e8de1481 | 774 | res = __request_region(parent, start, n, "check-region", 0); |
1da177e4 LT |
775 | if (!res) |
776 | return -EBUSY; | |
777 | ||
778 | release_resource(res); | |
779 | kfree(res); | |
780 | return 0; | |
781 | } | |
1da177e4 LT |
782 | EXPORT_SYMBOL(__check_region); |
783 | ||
e1ca66d1 RD |
784 | /** |
785 | * __release_region - release a previously reserved resource region | |
786 | * @parent: parent resource descriptor | |
787 | * @start: resource start address | |
788 | * @n: resource region size | |
789 | * | |
790 | * The described resource region must match a currently busy region. | |
791 | */ | |
d75fc8bb GKH |
792 | void __release_region(struct resource *parent, resource_size_t start, |
793 | resource_size_t n) | |
1da177e4 LT |
794 | { |
795 | struct resource **p; | |
d75fc8bb | 796 | resource_size_t end; |
1da177e4 LT |
797 | |
798 | p = &parent->child; | |
799 | end = start + n - 1; | |
800 | ||
801 | write_lock(&resource_lock); | |
802 | ||
803 | for (;;) { | |
804 | struct resource *res = *p; | |
805 | ||
806 | if (!res) | |
807 | break; | |
808 | if (res->start <= start && res->end >= end) { | |
809 | if (!(res->flags & IORESOURCE_BUSY)) { | |
810 | p = &res->child; | |
811 | continue; | |
812 | } | |
813 | if (res->start != start || res->end != end) | |
814 | break; | |
815 | *p = res->sibling; | |
816 | write_unlock(&resource_lock); | |
8b6d043b AC |
817 | if (res->flags & IORESOURCE_MUXED) |
818 | wake_up(&muxed_resource_wait); | |
1da177e4 LT |
819 | kfree(res); |
820 | return; | |
821 | } | |
822 | p = &res->sibling; | |
823 | } | |
824 | ||
825 | write_unlock(&resource_lock); | |
826 | ||
685143ac GKH |
827 | printk(KERN_WARNING "Trying to free nonexistent resource " |
828 | "<%016llx-%016llx>\n", (unsigned long long)start, | |
829 | (unsigned long long)end); | |
1da177e4 | 830 | } |
1da177e4 LT |
831 | EXPORT_SYMBOL(__release_region); |
832 | ||
9ac7849e TH |
833 | /* |
834 | * Managed region resource | |
835 | */ | |
836 | struct region_devres { | |
837 | struct resource *parent; | |
838 | resource_size_t start; | |
839 | resource_size_t n; | |
840 | }; | |
841 | ||
842 | static void devm_region_release(struct device *dev, void *res) | |
843 | { | |
844 | struct region_devres *this = res; | |
845 | ||
846 | __release_region(this->parent, this->start, this->n); | |
847 | } | |
848 | ||
849 | static int devm_region_match(struct device *dev, void *res, void *match_data) | |
850 | { | |
851 | struct region_devres *this = res, *match = match_data; | |
852 | ||
853 | return this->parent == match->parent && | |
854 | this->start == match->start && this->n == match->n; | |
855 | } | |
856 | ||
857 | struct resource * __devm_request_region(struct device *dev, | |
858 | struct resource *parent, resource_size_t start, | |
859 | resource_size_t n, const char *name) | |
860 | { | |
861 | struct region_devres *dr = NULL; | |
862 | struct resource *res; | |
863 | ||
864 | dr = devres_alloc(devm_region_release, sizeof(struct region_devres), | |
865 | GFP_KERNEL); | |
866 | if (!dr) | |
867 | return NULL; | |
868 | ||
869 | dr->parent = parent; | |
870 | dr->start = start; | |
871 | dr->n = n; | |
872 | ||
e8de1481 | 873 | res = __request_region(parent, start, n, name, 0); |
9ac7849e TH |
874 | if (res) |
875 | devres_add(dev, dr); | |
876 | else | |
877 | devres_free(dr); | |
878 | ||
879 | return res; | |
880 | } | |
881 | EXPORT_SYMBOL(__devm_request_region); | |
882 | ||
883 | void __devm_release_region(struct device *dev, struct resource *parent, | |
884 | resource_size_t start, resource_size_t n) | |
885 | { | |
886 | struct region_devres match_data = { parent, start, n }; | |
887 | ||
888 | __release_region(parent, start, n); | |
889 | WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match, | |
890 | &match_data)); | |
891 | } | |
892 | EXPORT_SYMBOL(__devm_release_region); | |
893 | ||
1da177e4 LT |
894 | /* |
895 | * Called from init/main.c to reserve IO ports. | |
896 | */ | |
897 | #define MAXRESERVE 4 | |
898 | static int __init reserve_setup(char *str) | |
899 | { | |
900 | static int reserved; | |
901 | static struct resource reserve[MAXRESERVE]; | |
902 | ||
903 | for (;;) { | |
8bc1ad7d | 904 | unsigned int io_start, io_num; |
1da177e4 LT |
905 | int x = reserved; |
906 | ||
907 | if (get_option (&str, &io_start) != 2) | |
908 | break; | |
909 | if (get_option (&str, &io_num) == 0) | |
910 | break; | |
911 | if (x < MAXRESERVE) { | |
912 | struct resource *res = reserve + x; | |
913 | res->name = "reserved"; | |
914 | res->start = io_start; | |
915 | res->end = io_start + io_num - 1; | |
916 | res->flags = IORESOURCE_BUSY; | |
917 | res->child = NULL; | |
918 | if (request_resource(res->start >= 0x10000 ? &iomem_resource : &ioport_resource, res) == 0) | |
919 | reserved = x+1; | |
920 | } | |
921 | } | |
922 | return 1; | |
923 | } | |
924 | ||
925 | __setup("reserve=", reserve_setup); | |
379daf62 SS |
926 | |
927 | /* | |
928 | * Check if the requested addr and size spans more than any slot in the | |
929 | * iomem resource tree. | |
930 | */ | |
931 | int iomem_map_sanity_check(resource_size_t addr, unsigned long size) | |
932 | { | |
933 | struct resource *p = &iomem_resource; | |
934 | int err = 0; | |
935 | loff_t l; | |
936 | ||
937 | read_lock(&resource_lock); | |
938 | for (p = p->child; p ; p = r_next(NULL, p, &l)) { | |
939 | /* | |
940 | * We can probably skip the resources without | |
941 | * IORESOURCE_IO attribute? | |
942 | */ | |
943 | if (p->start >= addr + size) | |
944 | continue; | |
945 | if (p->end < addr) | |
946 | continue; | |
d68612b2 SS |
947 | if (PFN_DOWN(p->start) <= PFN_DOWN(addr) && |
948 | PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1)) | |
379daf62 | 949 | continue; |
3ac52669 AV |
950 | /* |
951 | * if a resource is "BUSY", it's not a hardware resource | |
952 | * but a driver mapping of such a resource; we don't want | |
953 | * to warn for those; some drivers legitimately map only | |
954 | * partial hardware resources. (example: vesafb) | |
955 | */ | |
956 | if (p->flags & IORESOURCE_BUSY) | |
957 | continue; | |
958 | ||
379daf62 SS |
959 | printk(KERN_WARNING "resource map sanity check conflict: " |
960 | "0x%llx 0x%llx 0x%llx 0x%llx %s\n", | |
13eb8375 IM |
961 | (unsigned long long)addr, |
962 | (unsigned long long)(addr + size - 1), | |
963 | (unsigned long long)p->start, | |
964 | (unsigned long long)p->end, | |
965 | p->name); | |
379daf62 SS |
966 | err = -1; |
967 | break; | |
968 | } | |
969 | read_unlock(&resource_lock); | |
970 | ||
971 | return err; | |
972 | } | |
e8de1481 AV |
973 | |
974 | #ifdef CONFIG_STRICT_DEVMEM | |
975 | static int strict_iomem_checks = 1; | |
976 | #else | |
977 | static int strict_iomem_checks; | |
978 | #endif | |
979 | ||
980 | /* | |
981 | * check if an address is reserved in the iomem resource tree | |
982 | * returns 1 if reserved, 0 if not reserved. | |
983 | */ | |
984 | int iomem_is_exclusive(u64 addr) | |
985 | { | |
986 | struct resource *p = &iomem_resource; | |
987 | int err = 0; | |
988 | loff_t l; | |
989 | int size = PAGE_SIZE; | |
990 | ||
991 | if (!strict_iomem_checks) | |
992 | return 0; | |
993 | ||
994 | addr = addr & PAGE_MASK; | |
995 | ||
996 | read_lock(&resource_lock); | |
997 | for (p = p->child; p ; p = r_next(NULL, p, &l)) { | |
998 | /* | |
999 | * We can probably skip the resources without | |
1000 | * IORESOURCE_IO attribute? | |
1001 | */ | |
1002 | if (p->start >= addr + size) | |
1003 | break; | |
1004 | if (p->end < addr) | |
1005 | continue; | |
1006 | if (p->flags & IORESOURCE_BUSY && | |
1007 | p->flags & IORESOURCE_EXCLUSIVE) { | |
1008 | err = 1; | |
1009 | break; | |
1010 | } | |
1011 | } | |
1012 | read_unlock(&resource_lock); | |
1013 | ||
1014 | return err; | |
1015 | } | |
1016 | ||
1017 | static int __init strict_iomem(char *str) | |
1018 | { | |
1019 | if (strstr(str, "relaxed")) | |
1020 | strict_iomem_checks = 0; | |
1021 | if (strstr(str, "strict")) | |
1022 | strict_iomem_checks = 1; | |
1023 | return 1; | |
1024 | } | |
1025 | ||
1026 | __setup("iomem=", strict_iomem); |